Vorrichtung mit Kühlkreislauf

Elektrische Kompressorsteuerung und Kältekreislaufvorrichtung

Eine Steuerung, die einen elektrischen Kompressor (11) steuert, der an ein Fahrzeug montiert ist und eine zweistufige Kompressionskältekreislaufvorrichtung aufbaut, hat einen Verlangsamungsabschnitt (S23), einen Betriebsstoppabschnitt (S25) und einen Neustartabschnitt (S27). Der Verlangsamungsabschnitt verringert eine Drehzahl eines Elektromotors durch Steuern eines Wechselstroms, der an den Elektromotor ausgegeben wird, wenn eine zweistufige Betriebsart, in der ein Zwischendruckkältemittel von einer Zwischendrucköffnung in den elektrischen Kompressor strömt, durchgeführt wird und eine Betriebsstoppanforderung zum Stoppen des elektrischen Kompressors gestellt wird. Der Betriebsstoppabschnitt stoppt den Elektromotor, nachdem der Verlangsamungsabschnitt die Drehzahl des Elektromotors verringert. Der Neustartabschnitt startet den elektrischen Kompressor neu, wenn die Betriebsstoppanforderung aufgehoben wird, nachdem der Betriebsstoppabschnitt den elektrischen Kompressor stoppt.

Verbesserung in einem Ekonomiserkreislauf

Checking method for an electric connection in an electric motor driving a scroll compressor records temperatures during the scroll compressor's operation

A scroll compressor has a compression device (CD) (11), a rotary current motor (RCM) (12), and inlet (13) and outlet (14) openings. The CD has two endless screws/helixes, one being fixed and the other moving in relation to the first. The RCM links to three phases (R,S,T) in a rotary current network to drive the moving helix.

Fluidmaschine

ECONOMISER DEVICE

Improvements in or relating to refrigerating systems

... 202,254. Kõgi, E. Aug. 10, 1922, [Convention date]. Ball and float valves. - In a compact arrangement of a compression refrigerating plant, the liquefied refrigerant is delivered from the condenser 12 to a chamber 19 provided with a valve comprising coaxial and relatively - rotatable cylinders 24, 25 provided with more or less registering slits and actuated, through levers 26 and links 27, by movements of an annular float 28. The refrigerant passes through a distributing-chamber 33, and through the central passages 34 in the evaporator elements 32, returning after evaporization by way of annular passages 35 therein and a collecting-chamber 36 and pipe 37 to the compressor 3.

A scroll compressor

Speed estimation apparatus for AC motor, driving apparatus for AC motor, refrigerant compressor, and freezing cycle apparatus

The speed estimating apparatus 101 of the AC motor 2 includes a model deviatioin computing section 11 for computing a model deviation based on the voltage and the AC motor 2 and the angular velocity, and a model deviation calculating section 11 for calculating a low frequecy component, A second angular velocity estimating section (21) for calculating a second estimated angular velocity as a high frequency component of the actual angular velocity based on a specific high frequency component included deviation 22, and an adder for adding the first estimated angular velocity and the second estimated angular velocity, wherein an addition value of the first estimated angular velocity and the second estimated angular velocity is used as the estimated angular velocity to calculate the model deviation and feeds back the result to the calculation unit.

Improvements in or relating to compression refrigerating machines

... 511,464. Force-feed lubricating. SHEVLIN, J. T. (Siemens-Schuckertwerke Akt.-Ges.). Feb. 18, 1938, No. 25786. Divided out of 511,523, [Group XIII]. [Class 12 (iii)] [Also in Group XIII] An enclosed motor-compressor unit for a refrigerating machine comprises a casing 31 containing an electric motor supported by a carrier 34 and having a hollow shaft 36 formed with oil grooves 56, 57 and secured at its lower end to the disc 40 of an oil-ring pump for compressing the refrigerant. The disc is enclosed by a casing 45 secured to a sleeve 46 free to rotate on a fixed shaft 48 supported by a yoke 47 and formed with a spiral oil groove 50. During operation of the unit, the casing 45 and the sleeve 46 rotate and thereby oil is drawn from the casing 31 through a slot 49 and along the spiral groove 50 and passes down the centre of the shaft to a pipe 53, and thence through the cooler 55 to the oil grooves 56, 57 in the motor shaft. The oil returns to the casing through radial holes 58 in the carrier ...

Air conditioner

Suspension of vehicle with longitudinal arm of wheel

Assembly of suspension arm of wheel of vehicle.

FOR PROCEDURE, SYSTEM AND TURN OUT TO THE KUHLUNG OF INTEGRATIONS HIGH SPEED DEVICES

WAERMEPUMPE.

REFRIGERATION SYSTEMS

Gaseous fluid compression with alternating refrigeration and mechanical compression

A gaseous compression system (10) for compressing a gas from an initial pressure to an exit pressure with a first, blower compression bank (20) and a second, mechanical compression bank (30). Each compression bank has plural stages of gaseous compression with a gaseous fluid compressor (12, 22, 28, 34, 42, 46) and a heat pump intercooler (16, 24, 30, 36, 44, 48). The heat pump intercooler (16, 24, 30, 36, 44, 48) comprises a cascading heat pump intercooler (16, 24, 30, 36, 44, 48) with a high temperature section (56), a medium temperature section (58), and a low temperature section (60), each temperature section with an intercooler core (66). Each stage of the blower compression bank (20) has a high-pressure blower (12, 22, 28, 34), and each stage of the mechanical compressor bank (30) has a mechanical compressor (42, 46).

Refrigeration system

A compressor (20) and an expander (30) are installed in the refrigerant circuit (11) of an air conditioner (10). In the compressor (20), the refrigerant compressed by a compressing mechanism (21) is discharged into the internal space of a compressor casing (24). In the compressor (20), the refrigerator oil collected in the bottom of the compressor casing (24) is supplied to the compressing mechanism (21). The refrigerator oil collected in the bottom of the compressor casing (24) is introduced directly into the expanding mechanism (31) of the expander (30) through an oil supply pipe (41).

METHOD AND APPARATUS FOR IMPROVING HEAT PUMP PERFORMANCE BY COMPRESSION PATH SHIFTING

A vapor compression heat pump system comprising a lower temperature heat exchanger, a higher temperature heat exchanger and a compression path control (CPC) system. The CPC system increases the coefficient of performance (COP) obtainable with some refrigerants, the environmentally benign refrigerant 718 (water) being an outstanding example. This is achieved by the controlled alteration of the quality of the suction vapor prior to compression so that the resulting path of compression entails a reduced work requirement relative to the refrigerating effect obtained. When the system is employed with refrigerant 718 (water) the resulting COP is higher than those of the halo carbon refrigerants phased out by international agreement. Thus it offers improved performance as well as security against any future restrictions due to refrigerant environmental effects. The heat pump system can be used for heating or cooling or simultaneous heating and cooling; e.g., air conditioning and water heating.

AIR CONDITIONER EQUIPPED WITH SCROLL TYPE COMPRESSOR

... : Here is disclosed an air conditioner comprising a scroll type compressor and a brushless DC motor having a rotor provided with a permanent magnet and a stator provided with a sensor adapted to detect a relative position of said rotor and said stator. Here is additionally disclosed an air conditioner in which the rotor of the brushless DC motor comprises a permanent magnet basically made of rare earth elements inclusive of yttrium, transition metal and boron and a driving circuit for the motor includes a braking circuit adapted to excite coils of the motor and thereby to block the rotor against a reverse rotation.

METHOD, SYSTEM AND APPARATUS FOR COOLING HIGH POWER DENSITY DEVICES

A turbomachinery system (200) for cooling a high power density device (220) includes a turbomachine (300, 405, 505) configured to deliver a high flux cooling medium and a high power density device (220) arranged in fluid communication with the turbomachine (300, 405, 505), the turbomachine (300, 405, 505) having a motor (310) and a compressor (340) driven by the motor (310).

COMPRESSOR AND REFRIGERATION CYCLE APPARATUS

Provided is a highly reliable scroll compressor (10). The scroll compressor (10) comprises a case (20), a scroll compressor mechanism (50), a discharge pipe (24), a first temperature sensor (15), and a second temperature sensor (25). The scroll compressor mechanism (50) is arranged inside the case (20), compresses refrigerant that has been sucked in, and discharges the compressed refrigerant to refrigerant flow channels (R1R3) that are formed in an internal space in the case (20). The discharge pipe (24) allows the compressed refrigerant to flow from the internal space in the case (20) to the outside. The first temperature sensor (15) has a temperature-sensitive part (15a). The temperature-sensitive part (15a) is arranged in refrigerant flow channel (R2) and directly measures the temperature of the refrigerant. The second temperature sensor (25) is arranged in a different location from the first temperature sensor (15) and measures the temperature of the surface of the discharge pipe (24 ...

HIGH EFFICIENCY HEATING AND/OR COOLING SYSTEM AND METHODS

HVAC systems and methods for delivering highly efficient heating and cooling using ambient air as the working fluid. A plenum has an upstream inlet and a downstream outlet, each in fluid communication with a target space to be heated or cooled. Ambient air is drawn into the inlet at an incoming pressure and an incoming temperature. The inlet and outlet are gated, respectively, by first and second rotary pumps. A heat exchanger in the plenum transfers heat into or out of the air, provoking a change in air volume within the plenum. The systems and methods are configured to operate essentially between the working temperatures, THIGH and TLOW. This technique, called Convergent Refrigeration or counter-conditioning, provides for the reduction of excess refrigerant lift by optimization of the heat transfer temperature. Two Convergent Refrigeration systems can be arranged back-to-back through a common heat exchanger for ultra-high efficiency operation.

REMOVAL OF AN ANTIGENIC SUBSTANCE FROM A FLUID

A method of removing an antigenic substance from a fluid comprises (1) forming a ternary complex by the interaction of (a) the antigenic substance, (b) a first antibody which contains a kappa chain a nd which binds to the antigenic substance, and (c) a second antibody which binds to the kappa chain of the first antibody, said sec ond antibody being immobilised on a solid phase carrier, and (2) separating the fluid from the solid phase carrier.

Vakuumkältemaschine.

Rotationskompressor für Kältemaschinen.

Kältemaschine mit Rotationskompressor.

Groupe moteur électrique-compresseur à piston tournant pour appareil frigorifique.

Gekapseltes Kompressormotoraggregat.

Pompe volumétrique à débit réglable indépendamment de la vitesse de rotation.

Kompressor.

An ihrem Antriebsmotor fliegend angebaute Gaspumpe mit rotierendem Kolben.

Kompressions-Kälteanlage.

Wälzkolbenkompressor für Kälteanlagen.

Appareil frigorifique comprenant un groupe moteur électrique-compresseur.

Kompressionsaggregat

Verfahren zum Betrieb von Kältemaschinen

Impianto frigorifero a comando elettrico con gruppo motocompressore ermeticamente chiuso.

Procédé pour l'obtention de froid par compression et détente d'un fluide, et groupe frigorigène pour la mise en oeuvre de ce procédé.

Anlassvorrichtung für Kälteanlagen mit einem Turboverdichter.

Grosskälteerzeuger

功率调制涡旋机

... 本发明涉及一种设有独特的功率调制装置的涡旋压缩机，其适用于制冷和空调系统中。在一组实施例中，通过涡旋件间的相对轴向运动形成泄漏通路来调制压缩机的功率。在另一组实施例中通过减小一个涡旋件的运转半径形成泄漏通路进行调制。这两种涡旋件分离可以时间脉冲方式完成，从而通过选择负载和卸载时间的期间可实现全范围的调制以提高全系统的效率。电机控制装置也可用于上述两种方法中以提高减少负载期间电机的效率。另外上述调制装置中，还可以结合使用延迟吸入的功率调制方式，以便提高在一定条件下的工作效率。 ...

The use of the compressor and the compressor of the air conditioning equipment

SAFETY DEVICE FOR COMPRESSOR OF AIR-CONDITIONING

Process and apparatuses of refrigeration

Refrigerating unit

Cold store with rotary compressor

REFRIGERANT DEVICE

REFRIGERATING DEVICE

냉장고 및 리니어 압축기의 제어방법

... 본 발명의 리니어 압축기의 제어방법은, 실내 온도와 입력부를 통해 입력된 설정 온도에 기초하여, 복수의 스트로크 구간 들 중에서 선택된 일 스트로크 구간에 속하는 초기 운전 스트로크가 결정되는 단계; 상기 초기 운전 스트로크로 리니어 압축기가 작동되는 단계; 상기 리니어 압축기의 작동 중에 감지된 실내 온도의 변화에 따라서, 상기 선택된 일 스트로크 구간에서 운전 스트로크를 가변시키는 단계를 포함한다.

Air Conditioning System applying expander

REFRIGERATING APPARATUS

A buffer chamber (71) is connected to the outlet port (33) of an expansion mechanism (60). The buffer chamber (71) is formed in the shape of a cylinder extending in the direction of the flow of a cooling medium, and has a cross-sectional area greater than that of the outlet port (33). A rectifying plate (75) having a mesh section (75a) of a circular shape is provided inside the buffer chamber (71). The variation of pressure is relieved by the supply of pressure and the absorption of pressure by the buffer chamber (71), and also drops of the cooling medium are fined when they are passed through the plate (75). © KIPO & WIPO 2008 ...

ADAPTIVE CONTROL FOR REFRIGERATION SYSTEM USING DUTY CYCLE SCROLL COMPRESSOR MODULATED AT PULSE WIDTH

PURPOSE: An adaptive control for a refrigeration system using a duty cycle scroll compressor modulated at pulse width is provided to supply a distributed refrigeration system operated by a compressor modulated at the special pulse width with a condenser arranged both on and in a refrigeration case. CONSTITUTION: An adaptive control for a refrigeration system is serviced by a compressor(30) modulated at the special pulse width and connected to a condenser(32) and an evaporator(42). The system services the condenser and the compressor to a group of adjacent refrigeration cases(34). Each case is a distributed type with a self-evaporator. A controller(52) is connected to a load sensor for generating a variable duty cycle control signal. The duty cycle is a demand function of refrigeration. The automatic adaptive regulation control for the system is supplied with using a fuzzy logic method. © KIPO 2004 ...

REFRIGERATION CONTROL

PURPOSE: Refrigeration control is provided to improve the capacity with little power by preventing steam refrigerant from returning to an evaporator through a compressor with a first check valve and securely containing liquid refrigerant in a receiver with a second check valve. CONSTITUTION: A refrigerating system(10) includes an evaporator(24), a variable displacement compressor(12) coupled in fluid communication with the evaporator, a condenser(18) coupled in fluid communication between the compressor and the evaporator, an expansion valve(26) disposed between the condenser and the evaporator, and an isolation valve(22) disposed between the condenser and the expansion valve. The isolation valve is communicated with the compressor to respectively synchronize opening and closing thereof with on- and off-cycles of the compressor to prohibit migration of liquid refrigerant. First and second check valves are respectively associated with the compressor and the condenser for prohibiting reverse ...

mÁquina de voluta.

REFRIGERATION DEVICE

The disclosed refrigeration device is provided with a refrigerant circuit (11), wherein an expander (30) that allows the refrigerant to expand, generating motive power, and a compressor (20) are connected, and a refrigeration cycle is conducted. The refrigeration device is provided with an expander control unit (112) and a compressor control unit (111) that, when an operation suspension signal is output while in operation, decrease the rotational frequency of the compressor (20) and increase the rotational frequency of the expander (30), thus raising the rotational frequency ratio of the expander (30) with respect to the compressor (20).

Apparatus, method and software for use with an air conditioning cycle

A turbine for generating power has a rotor chamber, a rotor rotatable about a central axis within the rotor chamber, and at least one nozzle for supplying a fluid from a fluid supply to the rotor to thereby drive the rotor and generate power. The flow of the fluid from the nozzle exist is periodically interrupted by at least one flow interrupter means, thereby raising a pressure of the fluid inside the nozzle. A thermo-dynamic cycle is also disclosed including a compressor, a first turbine downstream of the compressor, a heat exchanger located downstream of the first turbine and operable to reject heat from the cycle to another thermodynamic cycle, an evaporator downstream of the heat exchanger and a second turbine downstream of the evaporator and upstream of the compressor.

Very low temperature refrigeration system having a scroll compressor with liquid injection

Disclosed is a very low temperature or cryogenic refrigeration system with a scroll compressor and utilizing a mixed refrigerant that decreases refrigerant discharge temperature by refrigerant injection into the compressor.

Fluid machine

A fluid machine according to the present invention has an expansion-and-compressor device selectively operating as an expansion device for collecting waste heat from an internal combustion engine and converting the collected heat energy into mechanical rotational force, and as a compressor device for compressing refrigerant for a refrigerating cycle for air conditioner. The fluid machine further comprises an electric rotating device selectively operating as an electric power generator and as an electric motor. A power transmission device is further provided between the expansion-and-compressor device and the electric rotating device for selectively transmitting the rotational force from the expansion-and-compressor device to the electric rotating device and vice versa. The power transmission device is composed of a planetary gear train so that it can change rotational speed to be transmitted to the expansion-and-compressor device or to the electric rotating device. Accordingly, the expansion-and-compressor ...

Refrigeration apparatus with leak detection on the usage side and a refrigerant release mechanism

Provided is a refrigeration apparatus with improved safety. A refrigeration apparatus includes: a compressor; a heat source-side expansion valve to be controlled to have a minimum opening degree and brought into a closed state in which the heat source-side expansion valve maximizes prevention of a flow of a refrigerant toward a usage-side refrigerant circuit; a fusible plug; a controller; and a refrigerant leak detector configured to detect a refrigerant leak at the usage-side refrigerant circuit. The fusible plug is disposed in a refrigerant circuit, and is brought into an open state to allow the refrigerant circuit to communicate with an external space. When the refrigerant leak detector detects a refrigerant leak at the usage-side refrigerant circuit, the controller performs refrigerant leak first control to bring the heat source-side expansion valve into the closed state, and performs refrigerant leak second control to bring the fusible plug into the open state.

Compressor with unloader valve between economizer line and evaporator inlet

A compressor has an economizer injection line communicating into the compressor compression chambers. An unloader valve selectively communicates the economizer injection line back to a point upstream of the evaporator. When the compressor is run in unloaded mode, partially compressed refrigerant is thus returned to a point upstream of the evaporator. In unloaded mode, this results in a higher refrigerant mass flow through the evaporator, as compared to prior art where the bypassed refrigerant was returned downstream of the evaporator. This increases system efficiency by more effectively returning oil which otherwise might be left in the evaporator back to the compressor. Also, the amount of refrigerant superheat entering the compressor in unloaded operation is reduced as compared to the prior art compressor systems, wherein the bypassed refrigerant is returned directly to the compressor suction line. Reduced refrigerant superheat increases system efficiency, improves motor performance and ...

Refrigeration

Fluid coupling compressor drive

Compressor With Fluid Cavity For Cooling

A compressor may include a shell, a first scroll, and a second scroll. The shell may include a first inlet, a second inlet, and an outlet. The first scroll may include a first end plate and a first spiral wrap. The second scroll may include a second end plate and a second spiral wrap, the first and second spiral wraps cooperating to define a series of moving compression pockets therebetween. The moving compression pockets decrease in volume as the moving compression pockets move from a radially outer position to a radially inner position. The moving compression pockets may receive working fluid from the first inlet at the radially outer position and provide working fluid to the outlet at the radially inner position. The second end plate may include a fluid cavity receiving working fluid from the second inlet and fluidly isolated from working fluid within the moving compression pockets. 1. A compressor comprising:a shell including a first inlet, a second inlet, and an outlet;a first scroll including a first end plate and a first spiral wrap; anda second scroll including a second end plate and a second spiral wrap, the first and second spiral wraps cooperating to define a series of moving compression pockets therebetween, the moving compression pockets decrease in volume as the moving compression pockets move from a radially outer position to a radially inner position, the moving compression pockets receiving working fluid from the first inlet at the radially outer position and providing working fluid to the outlet at the radially inner position, the second end plate including a fluid cavity receiving working fluid from the second inlet and fluidly isolated from working fluid within the moving compression pockets, the shell defines a discharge chamber and a suction chamber, wherein the first and second scrolls are disposed within the suction chamber,', 'the moving compression pockets at the radially outer position are in fluid communication with the suction chamber,', ...

Compressor with check valve orientated at angle relative to discharge tube

A unique positioning of a discharge tube relative to a pivot axis of a check valve in a compressor reduces the wear and fatigue stresses on the pivoting check valve components. The tube is centered on an axis that is non-perpendicular to an axis that is parallel to the pivot axis of the check valve, and in one embodiment was at 45°. With the inventive positioning of the discharge tube relative to the pivot axis, the flow streamlines heading from the discharge port to the discharge tube are no loner normal to the flapper valve surface, and the amount of wear between moving valve components and fatigue stresses are reduced.

Heat Pump Apparatus

The present invention realizes a reliable heat pump apparatus and heat pump apparatus having high recovering efficiency. The heat pump apparatus includes an expander 711 for expanding working fluid, a permanent magnet type synchronization power generator 710 which is disposed for recovering power by the expander 711 and which generates three phase AC power, and a first converter 708 which converts the AC power to DC power, and which rotates the power generator 710 at a predetermined target number of revolutions by switching of a switching element group 709. The generated electricity is consumed by connection of an AC power supply 701 to a DC power line which is rectified and smoothened by a rectifier circuit 702 and a smoothing capacitor 703, and by driving of an electric motor 706 which rotates a compressor 707 through a motor drive apparatus 704, and the power is efficiently recovered.

Gas heat pump system

The present invention relates to a gas heat pump system. A gas heat pump system according to one embodiment of the present invention comprises: a compressor for compressing a refrigerant; a gas engine for driving the compressor; a mixer for mixing air and fuel to generate a mixed gas to be supplied to the gas engine; a mixed gas supply line connected between the mixer and the gas engine; and a supercharger for supercharging the mixed gas supplied to the gas engine through the mixed gas supply line, wherein the supercharger comprises a sealed housing formed by sealing the remaining parts thereof other than an inlet port and an outlet port through which the mixed gas moves into and out of the housing, and a bypass line is provided between the sealed housing and the inlet port of the supercharger so as to resupply a mixed gas in the sealed housing to the inlet port of the supercharger. Therefore, the system can prevent a safety-related accident resulting from the leakage of the mixed gas out ...

REFRIGERANT COMPRESSOR AND REFRIGERATION CYCLE SYSTEM

A refrigerant compressor includes a first layer (24) composed of a single layer of chromium, a second layer (25) composed of an alloy layer of chromium and tungsten carbide, a third layer (26) composed of an amorphous carbon layer containing at least one of tungsten and tungsten carbide, and a fourth layer (27) composed of an amorphous carbon layer containing carbon and hydrogen without metals, which are sequentially formed on a surface of a sliding member (13b) of a compression mechanism formed of tool steel. The second layer (25) is formed to have a chromium content higher on a side of the first layer (24) than a side of the third layer (26), and have a tungsten carbide content higher on the side of the third layer (26) than the side of the first layer (24)- In addition, the third layer (26) is formed to have a tungsten content or a tungsten carbide content higher on a side of the second layer (25) than a side of the fourth layer (27).

DISTRIBUTED CONDENSING UNITS

An adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor

A control for a refrigeration system serviced by a special pulse width modulated compressor (30) coupled to a condenser (32)and evaporator (42). The system can be of the distributed type wherein the condenser (32) and compressor (30) may be coupled to service a group of adjacent refrigeration cases, wherein each case would have its own evaporator (42). A controller (52) is coupled to a load sensor (58) for producing a variable duty cycle control signal (54) in which the duty cycle is a function of demand for cooling. Moreover, fuzzy logic technique may be utilized in order to provide self adaptive tuning control for the system.

AN ADAPTIVE CONTROL FOR A REFRIGERATION SYSTEM USING PULSE WIDTH MODULATED DUTY CYCLE SCROLL COMPRESSOR

A control for a refrigeration system serviced by a special pulse width modulated compressor (30) coupled to a condenser (32) and evaporator (42). The system can be of the distributed type wherein the condenser (32) and compressor (30) may be coupled to service a group of adjacent refrigeration cases, wherein each case would have its own evaporator (42). A controller (52) is coupled to a load sensor (58) for producing a variable duty cycle control signal (54) in which the duty cycle is a function of demand for cooling. Moreover, fuzzy logic technique may be utilized in order to provide self adaptive tuning control for the system.

СИСТЕМЫ И СПОСОБ ПОДОГРЕВА КАРТЕРА КОМПРЕССОРА

... 1. Система подогрева картера компрессора, содержащая:компрессор с кожухом, в котором размещается механизм сжатия, приводимый электродвигателем, когда компрессор включен, и не приводимый электродвигателем, когда компрессор выключен;преобразователь частоты частотно-регулируемого привода, который обеспечивает работу электродвигателя, когда компрессор включен, путем регулирования частоты напряжения, подаваемого на электродвигатель, и подает электрический ток в статор электродвигателя для нагрева компрессора, когда компрессор выключен.2. Система по п.1, которая содержит также модуль управления, подсоединенный к преобразователю частоты, который регулирует скорость вращения электродвигателя, когда компрессор включен, и регулирует электрический ток, подаваемый в статор электродвигателя, когда компрессор выключен.3. Система по п.2, которая содержит также:датчик температуры, который вырабатывает сигнал температуры, соответствующий температуре компрессора;причем модуль управления принимает сигнал ...

Способ стабилизации температуры хладоносителя

Verdichtergeräuschreduzierung

Ein Scrollverdichter, umfassend: eine Einhausung, umfassend: einen Verdichtungsmechanismus, der ein Arbeitsfluid verdichtet; eine Auslassöffnung, durch die ein verdichtetes Arbeitsfluid ausgegeben wird; einen Auslasssammler, der das verdichtete Arbeitsfluid von der Auslassöffnung aufnimmt; und einen Pulsationsdämpfer, der innerhalb des Auslasssammlers angeordnet ist, wobei der Pulsationsdämpfer den Auslasssammler in eine Vielzahl von Volumina unterteilt.

Klimagerät mit einem durch einen Antrieb angetriebenen Kompressor für Fahrzeuge zum Anhalten ohne Motorbetrieb

Ein kostengünstiges Fahrzeug-Klimagerät zum Anhalten von Fahrzeugen ohne Motorbetrieb ist in der Lage, sowohl Kühl- als auch Heizfunktionen während des gesamten Jahres durchzuführen. Das Klimagerät enthält einen durch den Motor angetriebenen Kompressor (111, 1112) und eine durch den Motor angetriebene Pumpe (11, 9112) für eine Heizeinheit. Das Klimagerät enthält einen durch einen Antrieb angetriebenen Kompressor (220, 2202) und eine durch einen Antrieb angetriebene Pumpe (230, 2302). Eine Steuereinheit (130, 1302) betreibt den Antrieb derart, dass der durch den Antrieb angetriebene Kompressor (220, 2202) angetrieben wird, wenn die Notwendigkeit zum Kühlen besteht, und die durch den Antrieb angetriebene Pumpe (230, 2302) angetrieben wird, wenn die Notwendigkeit zum Heizen besteht, wenn der Motor abgeschaltet wird. Die Batterieleistung wird durch verschiedene Verfahren geschont.

Kühlerkapazitätssteuerungsgeräte, -verfahren und -systeme

Kühlersystem (100), das umfasst:einen Kühlkreislauf, der einen Zentrifugalkompressor (110), einen Kondensator (120) und einen Verdampfer (130) umfasst,eine oder mehrere variable Einlassführungsschaufel(n) (140), die stromaufwärts von dem Kompressor (110) angeordnet ist/sind;einen Regelantrieb (150), der dazu eingerichtet ist, den Kompressor (110) anzutreiben; undeine Steuerung (160), die dazu eingerichtet ist, die Position der Einlassführungsschaufeln (140) und die Drehzahl des Regelantriebs (150) zu steuern;wobei die Steuerung (160) dazu eingerichtet ist, die Kühlerkapazität entlang einer Steuerlinie, die zwischen einer ersten Kapazität und einer zweiten Kapazität definiert ist, zu steuern, indem sie über einen ersten Kühlerkapazitätsbereich eine Kompressordrehzahl variiert und eine Schaufelposition variiert, über einen zweiten Kapazitätsbereich, der größer als der erste Kapazitätsbereich ist, eine Kompressordrehzahl beibehält und eine Schaufelposition variiert und über einen dritten Kapazitätsbereich ...

Klimaanlage

Klimaanlage, die aufweist:einen Kondensator, der Kältemittel kondensiert;eine erste Expansionsvorrichtung, in der das durch den Kondensator geführte Kältemittel gedrosselt wird;eine zweite Expansionsvorrichtung, in der das durch die erste Expansionsvorrichtung geführte Kältemittel gedrosselt wird;einen Verdampfer, über den das durch die zweite Expansionsvorrichtung geführte Kältemittel verdampft wird;einen Kompressor, der aufweist:eine erste Kompressionseinheit, in die das durch den Verdampfer geführte Kältemittel eingeleitet wird und in der das eingeleitete Kältemittel komprimiert wird, undeine zweite Kompressionseinheit, in die das durch die erste Kompressionseinheit geführte Kältemittel sowie das zwischen der ersten Expansionsvorrichtung und der zweiten Expansionsvorrichtung abgezweigte und eingespritzte Kältemittel gemeinsam eingeleitet werden und in der dieeingeleiteten Kältemittel komprimiert werden;ein Einspritzventil, in dem das Kältemittel gedrosselt wird, das zwischen der ersten ...

Refrigeration system for transcritical operation with economizer and low-pressure receiver

A scroll compressor

Industrial refrigeration plant

... 1,061,323. Refrigerating. SULZER BROS. Ltd. June 28, 1965 [July 9, 1964], No. 27326/65. Heading F4H. The conventional base-plate for supporting the rotary motor-compressor unit 1 and evaporator 5 is omitted and instead the motorcompressor unit and evaporator are rigidly connected by means of the suction line 3 (Fig. 2, not shown) and a metal strap 6. The latter prevents relative movement between the compressor and evaporator vertically and transversely of the latter while permitting relative movement lengthwise of the evaporator. Supporting members 7 having vibration damping inserts 9 of elastomeric material are provided one at each end of the evaporator and one at the compressor. The condenser 10 is mounted on the evaporator by supports 12, 14 having an elastomeric insert 13 therebetween.

Improvements in and relating to refrigerating plants

... 381,412. Refrigerating. AKT.-GES. BROWN, BOVERI, ET CIE, Baden, Switzerland. Dec. 28, 1931, No. 35843. Convention date, Jan. 8. [Class 29.] Vacuum machines.-The exhauster 2 and its driving motor 3 are enclosed in one main casing 1 with the condenser 4 and evaporator 5, and all the auxiliary apparatus, for example the float regulating valve 9, refrigerant circulating pump 13, air discharge pump 14, and auxiliary motor 7 are disposed in a separate casing 6, thereby reducing the number of packed joints and leakage. The air discharge means may include a cooler 16 and mercury seal 18 as described in Specification 361,816.

Improvements in and relating to enclosed refrigerating machines

... 361,816. Refrigerating. AKT.-GES. BROWN, BOVERI, ET CIE, Baden, Switzerland. May 21, 1931, No. 15074. Convention date, Sept. 4, 1930. [Class 29.] Compression machines.-A reciprocating-piston pump 8 lubricated only by the liquefied refrigerant is employed for removing air and uncondensed gases from enclosed systems having a centrifugal compressor 2. The pump is driven by gearing 7 enclosed in the bearing box 6 of the compressor or of its driving means, this box being outside the enclosed machine and lubricated with oil. The pump is located in the evaporator space 4, which is separated by a partition 19 from the condenser space 3, and the liquefied refrigerant used as lubricant flows under pressure through a pipe 18. The pump has inlet ports controlled by the piston itself and a delivery valve 17 discharging into a coil 11, where refrigerant vapour is condensed. The condensate from the coil collects in a reservoir having a float valve 12 discharging into the evaporator, and the uncondensed ...

Compressing apparatus with variable capacity range and capacity control

The apparatus (31) includes first (39) and second (41) rotary compressing devices arranged to operate in a parallel mode at a mode where either the first or the second compressing device is effective. The latter mode can be selected by closing a valve (81) at the inlet to compressing device (39). A relatively high driving frequency is applied to the rotary compressing device (39 or 41) in the single operation mode when the compressing capacity of the apparatus (31) in the single mode is the same as that in the parallel mode to enhance the EER of the compressing apparatus. By use of single operation mode the lower end of the compressing capacity range of the compressing apparatus may be extended as compared with the range for a single compressing device apparatus capable of giving the same maximum compressing capacity. …… ...

Refrigeration System for Transcritical Operation with Economizer

A Refrigeration System with an Economizer for Transcritical Operation.

A refrigeration circuit has a compressor 21 operating at least on three pressure levels: suction pressure 11 on the compressor suction side 29; intermediate pressure 10 at an economizer connection 31; and discharge pressure 2 on a discharge side 22. The circuit also has a gas cooler 23, an evaporator 30 and a controllable throttling point 28, and an intercooler 24. The intercooler has first and second flow paths, with the first flow path arranged between the gas cooler and the evaporator. The second flow path connects the intercooler at inlet and outlet connections, with the inlet connection arranged to provide flow from piping between the economizer and the evaporator, and via a controllable throttling point 26. The outlet connection provides flow from the economizer to the compressor economizer connection. The circuit may also include an aftercooler 27 in a flow path between the intercooler and the evaporator, and a separator 25 may be connected to the aftercooler and provide a liquid ...

Refrigeration apparatus

A refrigeration apparatus comprising a compressor, a condenser, a pressure-reducing device and an evaporator connected sequentially in a loop. The loop includes a check valve placed between the outlet of said evaporator and the intake port of said compressor to prevent a refrigerant from flowing from the compressor side to the evaporator side; a pressure signal transmission pipe whose one end is connected to the outlet of said check valve to apply a pressure corresponding to the refrigerant pressure at the outlet side of said check valve and, a fluid control valve communicated with the other end of said pressure signal transmission pipe to control the refrigerant flowing to the inlet side of device in response to the refrigerant pressure in the other end of said pipe. The fluid control valve performs ON-OFF controlling operations depending on a difference in pressure between a pressure at the other end of said pressure signal transmission pipe and a pressure at the inlet side of said check ...

Improvements relating to refrigerating systems or apparatus

... 214,736. McNutt, W. A., and Kitson Engineering Co. (London), Ltd. Jan. 29,1923. Indicators actuated by floats. -The levels of condensed refrigerant and sealing liquid in a refrigerating machine are indicated by means 67 comprising a needle 70 influenced by a magnet 72 on an arm 74 carrying a cork float 75. Specification 193,739, [Class 110 (ii), Rotary engines &c.], is referred to.

Improvements in fluid compressors

... 937,389. Rotary compressors. WHIRLPOOL CORPORATION. Jan. 11, 1962 [Jan. 23, 1961], No. 1100/62. Class 110 (2). A rotary compressor comprises a rotor 10 having a plurality of diametrically opposed pairs of outwardly sliding vanes 15 and a casing 12 whose inner surface 11 is concentric with the rotor and is of the form r = r 1 + A sin2# where r is the radius of the inner surface 11 from the axis, r 1 is the radius of the rotor, the rotor and the casing thus being in grazing contact, A is a constant and # is the angle between the minor axis of the inner surface cross-section and the radius r. The Specification gives suitable dimensions and rotational speeds for a refrigerant compressor.

Refrigeration plant for transcritical operation with an economiser

Improvements in or relating to refrigerating systems

... 220,299. Carrier Engineering Corporation, (Assignees of Carrier, IV. H.). Aug. 7, 1923, [Convention date]. Aspirating - apparatus, ejector; mixed fluids cooled in diffusers.-In a closed refrigerating system preferably employing dichlorethylene as the refrigerant and comprising an evaporator, a centrifugal exhauster, and a condenser, working under a partial vacuum, an ejector for withdrawing from the condenser any uncondensed vapour together with air that has leaked into the system, comprises a baffled chamber 47, Figs. 4, 11 and 13, containing a quantity of liquefied refrigerant. The air and vapour are drawn from the condenser through a pipe 41 connecting with a pipe or coil 49 in the evaporator leading to the induced-fluid inlet of an ejector 45 that is supplied with inducing-liquid through a pipe 48 by a centrifugal pump 46 drawing from the refrigerant in the central compartment 53a of the chamber 47. The ejector discharges through a perforated pipe 58 into a compartment 53, from which ...

Self-cooling device for beverages

REFRIGERATION SYSTEM

Improvements in and relating to totally enclosed refrigerating machines

... 385,928. Vacuum machines. AKT.-GES. BROWN, BOVERI, ET CIE, Baden, Switzerland. Oct. 31, 1932, No. 30654. Convention date, Dec. 24, 1931. [Class 29.] In a totally enclosed refrigerating-machine wherein the evaporator and the liquefier are arranged within a casing 1, the casing is reinforced with transverse beams 4 to form a rigid bedplate for the compressor group 8, 9. A cover 6 surrounds the compressor group and the space between the casing and cover is divided by partitions 7a, 7b, 7c so that the evaporator, liquefier, the driving motor and the compressor are each housed in a separate chamber. An auxiliary group 31 .. 35, outside the enclosed machine, controls the removal of air vented from the latter.

Improvements in and relating to totally enclosed refrigerating machines

... 405,578. Refrigerating. AKT.-GES. BROWN, BOVERI, ET CIE, Baden, Switzerland. Sept. 15, 1933, No. 25581. Convention date, Sept. 19, 1932. Addition to 385,928. [Class 29.] Vacuum systems.-In a totally enclosed refrigerating-machine in which the motor space is under liquefier pressure and the compressor housing is under evaporator pressure, according to the parent Specification, the motor is housed in a space which is also under evaporator pressure, the internal space of the motor, which contains the windings, only being under condenser pressure. The housing 32 containing the compressor 9 and the motor 8 communicates with the evaporator 3 through an opening 31. The interior of the motor casing communicates with the condenser 2 through conduits 13, 14, and is sealed from the space 32 under evaporator pressure by enclosing the motor shaft in a stuffing box.

Improvements in and relating to rotary compressors

... 437,255. Lubricating rotary compressors. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London. June 14, 1935, No. 17207. Convention date, June 14, 1934. [Class 12 (ii)] [See also Group XXVI] A rotary compressor for use in a refrigerating- machine is kept off load on starting until speed has been attained by arranging an adjustable spring 57 to hold the sliding abutment 40 out of action until a predetermined pressure has been established in the lubricating system. The rotor 35 is driven by an electric motor 12, the assembly including a fan 30 being supported by springs 15, 16. An extension of the rotor shaft drives a gear-wheel type pump 47, 49 which forces lubricating oil from a sump 29 through a strainer 52 into the interior of the rotor 35. A passage 56 leads oil to the back of the abutment 40 and when sufficient speed has been attained the abutment is forced into the working space against the action of the spring 57, and so puts the compressor on load. If excessive pressure ...

DIGITAL AUTOMATIC CONTROLLER FOR A SPIRAL COMPRESSOR CONDENSATION UNIT

REFRIGERANT CYCLE DEVICE AND COMPRESSOR FOR IT

Heat pump apparatus and operation method for heat pump apparatus

This description relates to a heat pump and a method of using the heat pump. The heat pump includes a hydraulic compressor that compresses a heat medium, an oil separation and recovery device that separates oil from the heat medium discharged from the compressor and returns the separated oil to the compressor, a condenser that liquefies the heat medium compressed in the compressor, a decompression device that decompresses the heat medium liquefied in the condenser, and an evaporator that causes the heat medium to absorb heat. The aforementioned devices are connected in series and the heat medium is circulated in those devices. The heat medium can be compressed at a compression ratio, at which a discharge temperature from the compressor becomes 150 to 200° C. An intake temperature control unit which can control the temperature of the heat medium taken into the compressor is on the intake side of the compressor.

Single-screw compressor

A screw compressor includes a screw rotor, a gate rotor, a drive mechanism to rotate the screw rotor, a cylinder, a discharge port and an adjustment mechanism. The screw rotor has an outer periphery with a helical groove engaged with radially arranged gates of the gate rotor. First and second axial ends of the screw rotor form suction and discharge sides, respectively. The cylinder accommodates the screw rotor to define a compression chamber in the helical groove. Fluid in the coin cession chamber flows through the discharge port toward the discharge side of the screw rotor. The adjustment mechanism is configured to adjust a compression ratio of the compression chamber within a predetermined. range. The adjustment mechanism adjusts the compression ratio to a minimum compression ratio immediately before or when operation of the adjustment mechanism is stopped.

Refrigeration system

A refrigeration system includes a refrigerant circuit including a compressor and an expander which expands a refrigerant and generates power, for performing a refrigeration cycle. The refrigeration system includes a compressor control section and an expander control section which, when an operation stop signal is output during operation, reduces a rotational speed of the compressor and increases a rotational speed of the expander to increase the ratio of the rotational speed of the expander to the rotational speed of the compressor.

SCREW COMPRESSOR DRIVE CONTROL

An embodiment of method used to control operation of a screw compressor of a refrigeration system may include receiving status signals regarding operation of the screw compressor of the refrigeration system. The method may further include determining an operating point of the screw compressor based upon the received status signals, and selecting a torque profile for the screw compressor based upon the operating point. The method may also include driving the screw compressor per the selected torque profile. Refrigeration systems and compressor systems suitable for implementing the method are also presented. 1. A compressor system comprisinga screw compressor comprising a suction port to receive fluid at a suction pressure, a plurality of meshing screw rotors to compress the fluid, and a discharge port to discharge the compressed fluid at a discharge pressure that is higher than the suction pressure;an electric motor to receive control signals and to drive the plurality of meshing screw rotors at a speed per the received control signals;a controller to receive status signals indicative of an operating point of the screw compressor, to select a torque profile for the screw compressor based upon the operating point of the screw compressor, and to generate command signals that requests the electric motor be driven per the selected torque profile; anda variable frequency drive to receive the command signals and to generate the control signals that drive the electric motor per the selected torque profile.2. The compressor system of claim 1 , further comprising a memory comprising a plurality of torque profiles claim 1 , wherein the controller is to select the torque profile from the plurality of torque profiles based upon the operating point indicated by the status signals.3. The compressor system of claim 1 , further comprising a memory comprising a plurality of torque profiles claim 1 , wherein the controller is to identify the operating point of the screw compressor ...

Low cost high efficiency ice machine

Disclosed are ice making machines which use aluminum as an alternative to copper in the ice making machine evaporator and also use an alternate coolant/refrigerant specifically targeted to provide improved heat transfer transport properties and higher heat capacitance than conventional HFC coolant/refrigerants. Optionally, rotary compressors are used in place of conventional reciprocating compressors, further enhancing performance for the ice making machine. The disclosed ice making machines maintain high efficiency and ice output, and provide equal or better energy efficiency than comparative ice making machines. At the same time, savings are realized in the material cost for the evaporator, and resulting from the combined effects of lower density and lower metal cost/unit weight offered by aluminum as compared to copper.

ACTIVE CLEARANCE MANAGEMENT IN SCREW COMPRESSOR

A compressor includes a housing defining a working chamber. The housing further includes a bore and an endplate disposed toward a discharge end. The compressor further includes a rotor having helical threads, the rotor being configured to be housed in the bore, a rotor clearance, a controllable bearing supporting the rotor, and a controller configured to control the controllable bearing such that the controllable bearing moves the rotor in a manner to reduce and/or enlarge the rotor clearance. 110-. (canceled)11. An HVAC system , comprising ,a fluidically connected fluid circuit including,a condenser,an expansion device disposed downstream of the condenser,an evaporator disposed downstream of the expansion device, a housing,', 'two bores within the housing,', 'an endplate disposed toward a high pressure end,', 'two rotors having intermeshing helical threads, the rotors being configured to be housed in the bores,', 'a rotor-to-rotor clearance defined between the two rotors,', 'a rotor-to-bore clearance defined between one of the rotors and an interior surface of the bores,', 'a rotor to endplate clearance defined between one of the rotors and the endplate,', 'a controllable bearing supporting one of the two rotors, and', 'a controller configured to control the controllable bearing such that the controllable bearing moves the one of the two rotors in a manner to reduce or enlarge the rotor-to-rotor, rotor-to-bore, or rotor to endplate clearances., 'a compressor disposed downstream of the evaporator and upstream of the condenser, the compressor including,'}12. The HVAC system according to claim 11 , wherein the housing further includes claim 11 ,an intake port disposed toward an opposite end from the discharge end,a discharge port disposed toward the discharge end, anda compression chamber defined by the helical threads of the two rotors and an interior surface of the housing, the compression chamber being configured to move from the intake port to the discharge port ...

SCROLL COMPRESSORS WITH DIFFERENT VOLUME INDEXES AND SYSTEMS AND METHODS FOR SAME

A plurality of scroll compressors with different fixed volume indexes are connected in fluid parallel circuit and configured to selectively operate to maximize isentropic efficiency at different condensing temperatures. Different quantities of scroll compressors of different volume indexes may be selected based upon typical climate or geographic location environmental conditions to attempt to maximize efficiency. A controller may selectively operate different combinations of the compressors of different volume indexes bases up load demands and condensing temperature conditions, which may be determined in a variety of ways. 1. A compressor arrangement , comprising:a plurality of refrigerant compressors connected in parallel circuit, each refrigerant compressor having a volume index, the plurality of refrigerant compressors including at least a first compressor and a second compressor, wherein each of the first compressor and the second compressor include a single inlet, single outlet, and a single flowpath extending between the single inlet and the single outlet, and wherein each of the first compressor and the second compressor includes a housing and a motor contained within said housing, the first compressor having a different volume index than each second compressor, wherein the volume index of the first compressor and the second compressor is fixed and non-variable.2. The compressor arrangement of claim 1 , wherein the first and second compressors are scroll compressors.3. The compressor arrangement of claim 2 , wherein in relative relation between the first and second compressors claim 2 , each first compressor has a higher isentropic efficiency at a high temperature range for saturated condensing temperature claim 2 , and wherein each second compressor has a higher isentropic efficiency at a low temperature range for saturated condensing temperature claim 2 , the high temperature range being higher than the low temperature range.4. The compressor arrangement of ...

ELECTRIC MOTOR HAVING PERMANENT MAGNET AND COMPRESSOR INCLUDING AN ELECTRIC MOTOR (As Amended)

An electric motor having a permanent magnet and a compressor including an electric motor are provided. The electric motor may include a stator; and a rotor rotatably disposed and spaced a predetermined gap apart from the stator. The rotor may include a rotational shaft, a permanent magnet arranged concentrically to the rotational shaft, and a permanent magnet support that supports the permanent magnet. The permanent magnet may have a cylindrical shape and be magnetized to have polar anisotropy such that a magnetic field is formed on the magnet's surface facing the gap but is not formed on the magnet's surface opposite to the gap. The permanent magnet support may be configured to form no flux path in the permanent magnet and connect the rotational shaft to the permanent magnet. Thus, the rotor has a reduced weight with consequent suppression of vibration and noise. 1. An electric motor having a permanent magnet , comprising:a stator; and a rotational shaft;', 'a permanent magnet disposed concentrically with the rotational shaft; and', 'a rotor frame provided between the rotational shaft and the permanent magnet, wherein the permanent magnet has a cylindrical shape and is magnetized in polar anisotropy such that a magnetic field is formed on a surface of the permanent magnet facing the gap and a magnetic field is not formed on a surface of the permanent magnet opposite to the gap, and wherein the rotor frame does not form a flux path of the permanent magnet and is configured to connect the rotational shaft and the permanent magnet., 'a rotor rotatably disposed and spaced a predetermined gap apart from the stator, wherein the rotor includes2. The electric motor permanent magnet of claim 1 , wherein the rotational shaft and the rotor frame are formed of different materials.3. The electric motor of claim 2 , wherein the rotor frame is injection-molded around the rotational shaft.4. The electric motor of claim 2 , wherein the rotational shaft includes at least one ...

AIR CONDITIONER

The present invention relates to an air conditioner. The air conditioner according to the present embodiment has a refrigeration capacity of 7 kW to 11 kW, inclusive, and uses, as a refrigerant, a mixed refrigerant containing 50% or more of R32, and since a refrigerant pipe therein is made of a ductile stainless steel material having 1% or less of a delta-ferrite matrix structure with respect to the grain size area thereof, and includes a suction pipe guiding the suction of the refrigerant into a compressor and having an outer diameter of 15.88 mm, the refrigerant pipe can maintain strength and hardness as good as or better than those of a copper pipe, while also maintaining good processability. 1. An air conditioner comprising:an outdoor unit comprising a compressor, an outdoor heat exchanger, and a main expansion device, wherein a refrigerant is circulated by a refrigerant pipe configured to connect the compressor, the outdoor heat exchanger, and the main expansion device to each other;an indoor unit comprising an indoor heat exchanger; anda connection pipe configured to connect the outdoor unit to the indoor unit,wherein the air conditioner has refrigeration capacity of 7 kW to 11 kW,a mixed refrigerant containing 50% or more of an R134a is used as the refrigerant,the refrigerant pipe is made of a ductile stainless steel material having a delta ferrite matrix structure of 1% or less on the basis of a grain area, andthe refrigerant pipe comprises a suction pipe that guides suction of a refrigerant into the compressor and has an outer diameter of 12.70 mm.2. The air conditioner according to claim 1 , further comprising a discharge pipe that guides discharge of the refrigerant compressed in the compressor and has an outer diameter of 7.94 mm.3. The air conditioner according to claim 2 , wherein the suction pipe has an inner diameter of 12.04 mm claim 2 , and the discharge pipe has an inner diameter of 7.54 mm.4. The air conditioner according to claim 1 , further ...

AIR CONDITIONING DEVICE USING VAPOR INJECTION CYCLE AND METHOD FOR CONTROLLING THE DEVICE

An air conditioning device includes a vapor injection cycle in which an operating speed of a compressor is adjusted to improve efficiency, and a method for controlling the device. The air conditioning device includes an inner heat-exchanger for exchanging heat between a first portion of refrigerant passing through a condenser and a second portion of the refrigerant branched from the first refrigerant, and an injection channel through which the second portion of the refrigerant is injected into the compressor. The inner heat exchanger includes an outer tube and an inner tube disposed inside the outer tube. The first portion of the refrigerant flows into the inner tube, while the second portion of the refrigerant flows into the outer tube. Thus, when a variation of air-conditioning load is small and an injection super-heating temperature is low, the device enables reduction of the compressor rotation speed to ensure high injection super-heating temperature. 1. An air conditioning device for use in performing a refrigeration cycle , the device comprising:a compressor for compressing refrigerant;a condenser for condensing the refrigerant from the compressor;an inner heat-exchanger for exchanging heat between a first portion of the refrigerant passing through the condenser and a second portion of the refrigerant branched from the first portion of the refrigerant;an injection channel through which the second portion of the refrigerant is injected into the compressor;a main expansion valve for regulating flow of the first portion of the refrigerant coming from the inner heat-exchanger; and wherein the inner heat exchanger includes an outer tube and a plurality of inner tubes disposed inside the outer tube, and', 'wherein the first portion of the refrigerant flows into the inner tubes, while the second portion of the refrigerant flows between the outer tube and the inner tubes., 'an injection expansion valve for controlling flow of the second portion of the refrigerant ...

AIR CONDITIONER

The present invention relates to an air conditioner. The air conditioner according to an embodiment of the present invention has a refrigeration capacity of 16 kW to 28 kW, inclusive, and uses, as a refrigerant, a mixed refrigerant containing 50% or more of R32, and a refrigerant pipe therein includes a ductile stainless steel pipe having 1% or less of a delta-ferrite matrix structure with respect to the grain size area thereof. The refrigerant pipe includes a suction pipe for guiding the suction of the refrigerant into a compressor, and the outer diameter of the suction pipe is formed to be 19.05 mm and the inner diameter thereof is formed to be 18.07 mm or less. Also, the refrigerant pipe includes a discharge pipe for guiding the discharge of the refrigerant compressed by the compressor, and the outer diameter of the discharge pipe is formed to be 12.70 mm and the inner diameter thereof is formed to be 12.04 mm or less. 1. An air conditioner comprising:an outdoor unit comprising a compressor, an outdoor heat exchanger, a main expansion device, and a refrigerant pipe configured to connect the outdoor heat exchanger to the main expansion device;an indoor unit comprising an indoor heat exchanger; anda connection pipe configured to connect the outdoor unit to the indoor unit,wherein the air conditioner has refrigeration capacity of 16 kW to 28 kW,a mixed refrigerant containing 50% or more of R32 is used as a refrigerant,the refrigerant pipe is made of a ductile stainless steel material having a delta ferrite matrix structure of 1% or less on the basis of a grain area, andthe refrigerant pipe comprises a suction pipe that guides suction of a refrigerant into the compressor and has an outer diameter of 19.05 mm.2. The air conditioner according to claim 1 , wherein the refrigerant pipe further comprises a discharge pipe that guides discharge of the refrigerant compressed in the compressor and has an outer diameter of 12.70 mm.3. The air conditioner according to claim 2 , ...

AIR CONDITIONER

The present invention relates to an air conditioner. The air conditioner according to the present embodiment has a refrigeration capacity of 7 kW to 11 kW, inclusive, and uses a refrigerant R32 as a refrigerant, and since a refrigerant pipe therein is made of a ductile stainless steel material having 1% or less of a delta-ferrite matrix structure with respect to the grain size area thereof, and includes a suction pipe guiding the suction of the refrigerant into a compressor and having an outer diameter of 15.88 mm, the refrigerant pipe can maintain strength and hardness as good as or better than those of a copper pipe, while also maintaining good processability. 1. An air conditioner comprising:an outdoor unit comprising a compressor, an outdoor heat exchanger, and a main expansion device, wherein a refrigerant is circulated by a refrigerant pipe configured to connect the compressor, the outdoor heat exchanger, and the main expansion device to each other;an indoor unit comprising an indoor heat exchanger; anda connection pipe configured to connect the outdoor unit to the indoor unit,wherein the air conditioner has refrigeration capacity of 7 kW to 11 kW,an R32 is used as the refrigerant,the refrigerant pipe is made of a ductile stainless steel material having a delta ferrite matrix structure of 1% or less on the basis of a grain area, andthe refrigerant pipe comprises a suction pipe that guides suction of a refrigerant into the compressor and has an outer diameter of 12.70 mm.2. The air conditioner according to claim 1 , further comprising a discharge pipe that guides discharge of the refrigerant compressed in the compressor and has an outer diameter of 7.94 mm.3. The air conditioner according to claim 2 , wherein the suction pipe has an inner diameter of 11.98 mm claim 2 , and the discharge pipe has an inner diameter of 7.46 mm.4. The air conditioner according to claim 1 , further comprising a discharge pipe that guides discharge of the refrigerant compressed in ...

AIR CONDITIONER

The present invention relates to an air conditioner. The air conditioner according to the present embodiment has a refrigeration capacity of 11 kW to 16 kW, inclusive, and uses R32 as a refrigerant circulating therein, and since a refrigerant pipe therein is made of a ductile stainless steel material having 1% or less of a delta-ferrite matrix structure with respect to the grain size area thereof, the refrigerant pipe can maintain strength and hardness as good as or better than those of a copper pipe, while also maintaining good processability. 1. An air conditioner comprising:an outdoor unit comprising a compressor, an outdoor heat exchanger, a main expansion device, and a refrigerant pipe configured to connect the outdoor heat exchanger to the main expansion device;an indoor unit comprising an indoor heat exchanger; anda connection pipe configured to connect the outdoor unit to the indoor unit,wherein the air conditioner has refrigeration capacity of 11 kW to 16 kW,an R32 is used as the refrigerant,the refrigerant pipe is made of a ductile stainless steel material having a delta ferrite matrix structure of 1% or less on the basis of a grain area, andthe refrigerant pipe comprises a suction pipe that guides suction of a refrigerant into the compressor and has an outer diameter of 15.88 mm.2. The air conditioner according to claim 1 , wherein the refrigerant pipe further comprises a discharge pipe that guides discharge of the refrigerant compressed in the compressor and has an outer diameter of 7.94 mm.3. The air conditioner according to claim 2 , wherein the suction pipe has an inner diameter of 14.98 mm or less claim 2 , and the discharge pipe has an inner diameter of 7.46 mm or less.4. The air conditioner according to claim 1 , wherein the refrigerant pipe further comprises a discharge pipe that guides discharge of the refrigerant compressed in the compressor and has an outer diameter of 9.52 mm.5. The air conditioner according to claim 4 , wherein the suction ...

ENGERY SYSTEM

Provided is an energy system comprising: a screw compressor; a condenser; an expansion device; an evaporator; an evaporator heat source flow path configured to provide a heating medium supplied from an outside as a heat source of the evaporator; a lubricant oil heat-exchanging unit configured to perform a heat-exchanging operation of the heating medium on an evaporator heat source flow path and lubricant oil including a refrigerant inside the screw compressor, to heat the lubricant oil by the heating medium before the screw compressor starts up, and to cool the lubricant oil by the heating medium discharged from the evaporator after the evaporator is heated by the heating medium, after the screw compressor starts up; and a controller configured to control the lubricant oil heat-exchanging unit depending on whether the screw compressor starts up. 1. An energy system comprising:a screw compressor;a condenser;an expansion device;an evaporator;an evaporator heat source flow path configured to provide a heating medium supplied from an outside as a heat source of the evaporator;a lubricant oil heat-exchanging unit configured to perform a heat-exchanging operation of the heating medium on an evaporator heat source flow path and lubricant oil including a refrigerant inside the screw compressor, to heat the lubricant oil by the heating medium before the screw compressor starts up, and to cool the lubricant oil by the heating medium discharged from the evaporator after the evaporator is heated by the heating medium, after the screw compressor starts up; anda controller configured to control the lubricant oil heat-exchanging unit depending on whether the screw compressor starts up.2. The energy system of claim 1 , wherein the lubricant oil heat-exchanging unit comprises:a lubricant oil heat exchanger configured to perform a heat-exchanging operation of the lubricant in a lubricant oil storage portion provided in the screw compressor and the heating medium on the evaporator ...

Variable economizer injection position

A compressor includes a bore, a rotor disposed within the bore, a compressor inlet, and a compressor outlet. The compressor further includes a compression chamber defined between the bore and the rotor, wherein a volume of the compression chamber gradually reduces from the compressor inlet to the compressor outlet. The compressor includes an economizer. The economizer is fluidically connected to the compression chamber. The economizer is configured to inject a working fluid into the compression chamber at an injection position. The injection position is changeable according to a working condition of the compressor.

THERMAL ENERGY-DRIVEN COOLING SYSTEM AND RELATED METHODS

A cooling system includes a heat exchanger configured to transfer thermal energy from a heat source to an internal fluid, an expander fluidly coupled with the heat exchanger and configured to reduce a pressure of the internal fluid received from the heat exchanger, a first air-cooled condenser fluidly coupled with the expander and configured to air cool the internal fluid that is received from the expander, a compressor fluidly coupled with the first air-cooled condenser and configured to increase the pressure of the internal fluid received from the first air-cooled condenser, and a second air-cooled condenser fluidly coupled with the compressor and configured to air cool the internal fluid received from the compressor. 1. A cooling system comprising:a heat exchanger configured to transfer thermal energy from a heat source to an internal fluid;a stack heat recovery steam generator fluidly coupled with the heat exchanger and configured to receive the internal fluid that is heated by the thermal energy transferred to the internal fluid by the heat exchanger, the stack heat recovery steam generator configured to heat the internal fluid received from the heat exchanger;an expander fluidly coupled with the stack heat recovery steam generator and configured to reduce a pressure of the internal fluid that is received from the stack heat recovery steam generator, the expander configured to be coupled with a generator and to drive the generator to generate electric current;a first air-cooled condenser fluidly coupled with the expander and configured to be conductively coupled with the generator, the first air-cooled condenser configured to receive the internal fluid from the expander and to air cool the internal fluid, the first air-cooled condenser also configured to be powered by the electric current generated from the expander driving the generator;a compressor fluidly coupled with the first air-cooled condenser and configured to be conductively coupled with the generator ...

SCROLL COMPRESSOR AND REFRIGERATION CYCLE APPARATUS

A first injection port is open to a suction chamber of a plurality of chambers at some rotation phases, and is located within an angular range defined by a line connecting a winding-end contact point of an orbiting scroll at a compression start phase with a base circle center of a fixed scroll and one of two lines tangent to a winding-end point locus of a tip seal at a tooth tip of a spiral body of the orbiting scroll and passing through a base circle center of the orbiting scroll, the one being closer to the winding-end contact point. The first injection port does not interfere with the tip seal at the tooth tip of the spiral body of the orbiting scroll. 1: A scroll compressor comprising:a hermetic container;a compression mechanism disposed in the hermetic container and including a fixed scroll and an orbiting scroll each including a spiral body disposed on a baseplate, the spiral body of the fixed scroll and the spiral body of the orbiting scroll being combined together to form a plurality of chambers including a compression chamber;a motor mechanism configured to drive the orbiting scroll; anda rotation shaft coupled to the orbiting scroll, with the orbiting scroll being eccentric from the motor mechanism, the rotation shaft being configured to transmit torque of the motor mechanism to the orbiting scroll to cause the orbiting scroll to orbit,wherein a tooth tip of the spiral body of the orbiting scroll has a tip seal;the baseplate of the fixed scroll has a first injection port intermittently opened and closed by the tooth tip of the spiral body of the orbiting scroll as the orbiting scroll orbits; andthe first injection port is open to a suction chamber of the plurality of chambers at some rotation phases, and is located within an angular range defined by a line connecting a winding-end contact point of the orbiting scroll at a compression start phase with a base circle center of the fixed scroll and one of two lines tangent to a winding-end point locus of the ...

ROTOR, MOTOR, AND AIR CONDITIONING APPARATUS

A rotor includes a shaft extending in the direction of an axis, and a rotor core including a central hole in which the shaft is inserted. The central hole includes a first central hole, a second central hole, and a third central hole in the direction of the axis. A distance from the axis to an inner circumferential surface of the third central hole is larger than a distance from the axis to an inner circumferential surface of the second central hole. The distance from the axis to the inner circumferential surface of the second central hole is larger than a distance from the axis to an inner circumferential surface of the first central hole. 1. A rotor comprising:a shaft extending in a direction of an axis;a rotor core having a central hole in which the shaft is inserted; anda permanent magnet mounted in the rotor core,wherein the central hole has a first central hole, a second central hole, and a third central hole in the direction of the axis,wherein a distance from the axis to an inner circumferential surface of the third central hole is larger than a distance from the axis to an inner circumferential surface of the second central hole,wherein the distance from the axis to the inner circumferential surface of the second central hole is larger than a distance from the axis to an inner circumferential surface of the first central hole, andwherein an end of the permanent magnet in the direction of the axis is located at a position corresponding to the third central hole of the rotor core.2. (canceled)3. The rotor according to claim 1 , further comprising a first resin part provided in the second central hole and the third central hole.4. The rotor according to claim 1 , wherein the shaft is fitted into the first central hole.5. The rotor according to claim 1 , wherein the first central hole is located at each end of the rotor core in the direction of the axis.6. The rotor according to claim 1 , wherein the third central hole claim 1 , the second central hole claim 1 ...

COMPRESSOR CHILLER SYSTEMS INCLUDING THERMOELECTRIC MODULES, AND CORRESPONDING CONTROL METHODS

According to various aspects, exemplary embodiments are disclosed of chiller systems including thermoelectric modules, and corresponding control methods. In an exemplary embodiment, a compressor chiller system generally includes a refrigerant loop having a refrigerant fluid, a compressor connected in the refrigerant loop to compress the refrigerant fluid, and a condenser connected in the refrigerant loop to receive the compressed refrigerant fluid from the compressor and to condense the compressed refrigerant fluid. The system also includes a heat transfer component connected in the refrigerant loop to receive the condensed refrigerant fluid from the condenser, and a coolant loop having a coolant fluid. The heat transfer component is connected in the coolant loop to transfer heat from the coolant fluid to the condensed refrigerant fluid. The system further includes a thermoelectric module connected in the coolant loop. The thermoelectric module is adapted to transfer heat into and/or out of the coolant fluid. 1. A compressor chiller system comprising:a compressor configured to compress a refrigerant fluid; anda thermoelectric module adapted to transfer heat into a coolant fluid for increasing temperature of the coolant fluid and to transfer heat out of the coolant fluid for decreasing the temperature of the coolant fluid, such that the thermoelectric module is operable for controlling the temperature of the coolant fluid, whereby the thermoelectric module is operable for providing additional cooling capacity when a cooling demand of the compressor chiller system exceeds a maximum cooling capacity of the compressor thereby enabling the compressor to run continuously which reduces compressor turn on and turn off events.2. The system of claim 1 , wherein the system includes a refrigerant loop having the refrigerant fluid claim 1 , and wherein the compressor is connected in the refrigerant loop.3. The system of claim 2 , wherein the system includes a condenser connected ...

SYSTEM AND METHOD FOR LUBRICANT SEPARATION AND RETURN CONTROL

An HVACR system includes first and second compressors arranged in parallel, a condenser, an expansion device, an evaporator, and a lubricant separator fluidly connected. The first compressor includes a first lubricant sump and a first suction inlet. The second compressor includes a second lubricant sump and a second suction inlet. The lubricant separator is disposed between the evaporator and the first and second compressors, and includes a fluid inlet and two fluid outlets. A first of the two fluid outlets is fluidly connected to at least one of the first and second lubricant sumps. A second of the two fluid outlets is fluidly connected to the first and second suction inlets. The second fluid outlet includes a nozzle disposed within a flow passage of the lubricant separator such that a space is maintained between an outer surface of the nozzle and an inner surface of the flow passage. 1. A heating , ventilation , air conditioning , and refrigeration (HVACR) system , the system comprising:a first compressor, a second compressor, a condenser, an expansion device, an evaporator, and a lubricant separator fluidly connected;wherein the first compressor and the second compressor are arranged in parallel,the first compressor includes a first lubricant sump and a first suction inlet,the second compressor includes a second lubricant sump and a second suction inlet, andthe lubricant separator is disposed between the evaporator and the first and second compressors, the lubricant separator includes a fluid inlet and two fluid outlets, a first of the two fluid outlets is fluidly connected to at least one of the first and second lubricant sumps, a second of the two fluid outlets is fluidly connected to the first and second suction inlets, the second fluid outlet includes a nozzle disposed within a flow passage of the lubricant separator such that a space is maintained between an outer surface of the nozzle and an inner surface of the flow passage.2. The system according to claim ...

Air conditioner for vehicle

An air conditioner for a vehicle has a compressor, a radiator, a first pressure reducer, a gas-liquid separator, a second pressure reducer, an exterior heat exchanger, an intermediate pressure refrigerant passage, a switching device, and a controller. The controller operates the switching device to switch from a refrigerant circuit of a two-stage compression mode to a refrigerant circuit of a single-stage compression mode when a compressor stop signal is output in the two-stage compression mode. The single-stage compression mode is a mode that blocks at least a flow of an intermediate-pressure refrigerant into the intermediate pressure refrigerant passage and makes refrigerant remained in the intermediate pressure refrigerant passage to flow out of the intermediate pressure refrigerant passage. The controller stops the compressor after controls the compressor to continue operating for a specified time in the single-stage compression mode. The controller restarts the compressor when the compressor stop signal is canceled.

ROTARY COMPRESSOR

A rotary compressor includes a sealed longitudinal compressor housing which is provided with a discharge portion of a refrigerant at an upper portion thereof, is provided with an inlet portion of a refrigerant at a lower portion thereof, and in which lubricant oil is stored; a compressing unit which is disposed in the compressor housing, compresses a refrigerant sucked from the inlet portion and discharges the refrigerant from the discharge portion; a motor which is disposed in the compressor housing and drives the compressing unit via a rotation shaft; and an accumulator which is attached to a side portion of the compressor housing and is connected to the inlet portion of the refrigerant. When an inner diameter of a cylinder constituting the compressing unit is referred to as Dc, a height of the cylinder is referred to as Hc, and an eccentric amount of an eccentric portion of the rotation shaft is referred to as e, Dc, Hc, and e are set so that a value obtained by an expression (e+Hc)·(Dc−e)/(e·Hc)is less than 4.1. 1. A rotary compressor , comprising:a sealed longitudinal compressor housing which is provided with a discharge portion of a refrigerant at an upper portion thereof, is provided with an inlet portion of a refrigerant at a lower portion thereof, and in which lubricant oil is stored;a compressing unit which is disposed in the compressor housing, compresses a refrigerant sucked from the inlet portion and discharges the refrigerant from the discharge portion;a motor which is disposed in the compressor housing and drives the compressing unit via a rotation shaft; andan accumulator which is attached to a side portion of the compressor housing and is connected to the inlet portion of the refrigerant,{'sup': 1/3', '2/3, 'wherein when an inner diameter of a cylinder constituting the compressing unit is referred to as Dc, a height of the cylinder is referred to as Hc, and an eccentric amount of an eccentric portion of the rotation shaft is referred to as e, Dc, Hc ...

SCALLOP STEP FOR A SCROLL COMPRESSOR

A scroll member for a scroll compressor is disclosed. The scroll member includes a base member and a wrap member formed on a major surface of the base member. The wrap member includes a modified portion. The modified portion includes a base, a step, and a scallop. The base extends a first distance from the major surface. The step extends a second distance from the base. The scallop extends a third distance from the scallop. The scallop is located at a wrap surface of the wrap member. The wrap surface is disposed relatively away from the major surface relative to the step. 1. A scroll member for a scroll compressor , comprising:a base member; anda wrap member formed on a major surface of the base member;wherein the wrap member includes a modified portion, the modified portion including a base, a step, and a scallop, the base extending a first distance from the major surface, the step extending a second distance from the base, the scallop extending a third distance from the step, the scallop being located at a wrap surface of the wrap member, the wrap surface being disposed relatively away from the major surface relative to the step.2. The scroll member according to claim 1 , wherein a thickness of the base is relatively greater than a thickness of the step.3. The scroll member according to claim 2 , wherein the thickness of the step is relatively greater than a thickness of the scallop.4. The scroll member according to claim 1 , wherein the modified portion is disposed at a tip portion of the wrap member claim 1 , the tip portion being disposed adjacent to a discharge port of the scroll compressor.5. The scroll member according to claim 1 , wherein the base member and the wrap member are formed of a single piece claim 1 , unitary construction.6. The scroll member according to claim 1 , wherein the scroll member further includes a groove in the wrap surface of the wrap member.7. A scroll compressor claim 1 , comprising:a compressor housing;a non-orbiting scroll member ...

Vapor compression system

A refrigeration system includes a compressor connected to a first heat exchanger and a second heat exchanger. An expansion device is connected between the first heat exchanger and the second heat exchanger. A ratio of a volume of the first heat exchanger to a volume of the second heat exchanger is between 0.6 and 1.8.

SCROLL COMPRESSOR SHAFT

A crankshaft assembly for a scroll compressor is disclosed. The crankshaft assembly includes a crankpin having a plurality of apertures therethrough. A crankshaft body has an aperture therethrough. The aperture of the crankshaft and one of the plurality of apertures of the crankpin being aligned when in an assembled state such that in operation fluid flows between the aperture of the crankshaft body and the one of the plurality of apertures of the crankpin. The crankshaft body includes a second aperture aligned with a second of the plurality of apertures of the crankpin. The crankpin and the crankshaft body are separate members. A fastener extends through the second of the plurality of apertures of the crankpin and into the second aperture of the crankshaft body to secure the crankpin and the crankshaft body together in the assembled state. 1. A crankshaft assembly for a scroll compressor , comprising:a crankpin having a plurality of apertures therethrough;a crankshaft body having an aperture therethrough, the aperture of the crankshaft and one of the plurality of apertures of the crankpin being aligned when in an assembled state such that in operation fluid flows from the aperture of the crankshaft body and the one of the plurality of apertures of the crankpin, the crankshaft body including a second aperture, the second aperture of the crankshaft body being aligned with a second of the plurality of apertures of the crankpin, wherein the crankpin and the crankshaft body are separate members; anda fastener, extending through the second of the plurality of apertures of the crankpin and into the second aperture of the crankshaft body to secure the crankpin and the crankshaft body together in the assembled state.2. The crankshaft assembly according to claim 1 , further comprising a plurality of aligning members and a plurality of alignment apertures in the crankpin and the crankshaft body to align the crankpin and the crankshaft body when assembling the crankshaft ...

COMPRESSOR AND REFRIGERATION CYCLE APPARATUS

A compressor includes a casing, compression mechanism disposed inside the casing, a discharge tube, a first temperature sensor, and a second temperature sensor. The compression mechanism compresses a sucked refrigerant, and discharges the compressed refrigerant to a refrigerant channel formed in an inner space of the casing. The compressed refrigerant flows from the inner space of the casing to an outside through the discharge tube. The first temperature sensor includes a temperature sensing portion disposed in the refrigerant channel, and directly measuring a temperature of the refrigerant. The second temperature sensor is disposed at a different position from the first temperature sensor. The second temperature sensor measures a temperature of one of a surface of the discharge tube, an inner space of the discharge tube, and a surface of the casing. 1. A compressor comprising:a casing; compressing a sucked refrigerant, and', 'discharging the compressed refrigerant to a refrigerant channel formed in an inner space of the casing;, 'a compression mechanism disposed inside the casing, the compression mechanism'}a discharge tube through which the compressed refrigerant flows from the inner space of the casing to an outside;a first temperature sensor including a temperature sensing portion disposed in the refrigerant channel, the temperature sensing portion directly measuring a temperature of the refrigerant; and a surface of the discharge tube,', 'an inner space of the discharge tube, and', 'a surface of the casing., 'a second temperature sensor disposed at a different position from the first temperature sensor, the second temperature sensor measuring a temperature of one of'}2. The compressor according to claim 1 , whereinthe second temperature sensor measures the temperature of the surface of the discharge tube.3. The compressor according to claim 1 , whereinthe first temperature sensor is disposed to penetrate the casing, and the first temperature sensor is ...

COMPRESSOR AND AIR CONDITIONER INCLUDING THE SAME

A compressor and an air conditioner including the same having an improved structure capable of decreasing a discharge temperature of the compressor. The compressor which compresses and discharges refrigerant includes a casing defining an external appearance thereof, at least one cylinder including an inner space, a rolling piston which eccentrically turns in the inner space, a vane which radially abuts the rolling piston and divides the inner space into a suction chamber and a compression chamber, and a vane chamber recessed outward of the inner space such that the vane advances and retreats, a plurality of plates disposed above and below the at least one cylinder so as to define the inner space, an injection line provided in one of the at least one cylinder and the plural plates, and a check valve installed on the injection line. 1. A compressor which compresses and discharges refrigerant , comprising:a casing defining an external appearance thereof;at least one cylinder comprising an inner space, a rolling piston which eccentrically turns in the inner space, a vane which radially abuts the rolling piston and divides the inner space into a suction chamber and a compression chamber, and a vane chamber recessed outward of the inner space such that the vane advances and retreats, the cylinder being provided within the casing;a plurality of plates disposed above and below the at least one cylinder so as to define the inner space;an injection line provided in an area, within an angle of 220 to 340 degrees from a position of the vane of the at least one cylinder in a direction of rotation of the rolling piston, in one of the at least one cylinder and the plural plates, intermediate pressure refrigerant being supplied to the inner space of the at least one cylinder through the injection line; anda check valve installed on the injection line,wherein the refrigerant is a mixture of R32 refrigerant and at least one refrigerant of R1234yf, R1234ze and R152A.2. The compressor ...

Method for operating a chiller

A method of operating a chiller having a closed refrigerant loop including a compressor, a condenser and an evaporator. The refrigerant used in the loop defining a pressure-enthalpy curve representative of different phases (vapor, liquid and vapor, and liquid) of the refrigerant at different combinations of pressure and enthalpy. The loop defining a process cycle (compression, condensation, expansion, and evaporation) of the refrigerant during operation of the loop relative to the pressure-enthalpy curve of the refrigerant. The method including continuously operating the compressor when a segment of the process cycle corresponds to the refrigerant being in the liquid phase.

MOTOR, COMPRESSOR, AND AIR CONDITIONER

A motor includes a rotor rotatable about a rotation axis, and a stator surrounding the rotor so as to form an air gap between the stator and the rotor. The rotor has a rotor core having a magnet insertion hole and a rare earth magnet provided in the magnet insertion hole. The rotor core has a plurality of slits on an outer side of the magnet insertion hole in a radial direction about the rotation axis. Each of the plurality of slits has a length in the radial direction which is longer than a length in a circumferential direction about the rotation axis. The plurality of slits have a uniform minimum distance to the magnet insertion hole. When the minimum distance is expressed as T and the air gap is expressed as G, 2.75≤T/G≤5.25 is satisfied. 1. A motor comprising:a rotor rotatable about a rotation axis; anda stator surrounding the rotor so as to form an air gap between the stator and the rotor,wherein the rotor has a rotor core having a magnet insertion hole, and a rare earth magnet provided in the magnet insertion hole;wherein the rotor core has a plurality of slits on an outer side of the magnet insertion hole in a radial direction about the rotation axis;wherein each of the plurality of slits has a length in the radial direction which is longer than a length in a circumferential direction about the rotation axis;wherein the plurality of slits have a uniform minimum distance to the magnet insertion hole; andwherein when the minimum distance is expressed as T and the air gap is expressed as G,2.75≤T/G≤5.25 is satisfied.2. The motor according to claim 1 , wherein each of the plurality of slits extends parallel to a straight line in the radial direction passing through a center of the magnetic insertion hole in the circumferential direction.3. The motor according to claim 1 , wherein each of the plurality of slits extends to be inclined with respect to a straight line in the radial direction passing through a center of the magnetic insertion hole in the ...

AIR-CONDITIONING APPARATUS

An air-conditioning apparatus includes a primary-side circuit in which a compressor, a first flow switching device, an outdoor heat exchanger, a second flow switching device, a first expansion device, and a relay heat exchanger are connected by pipes and in which refrigerant circulates; a secondary-side circuit in which the relay heat exchanger, a pump, a plurality of indoor heat exchangers, and heat medium flow control devices are connected by pipes and in which a heat medium circulates; and a controller configured to control the first and second flow switching devices such that in cooling and heating operations, the refrigerant and a heat-source-side fluid flow through the outdoor heat exchanger in opposite directions and the refrigerant flows through the relay heat exchanger in a constant direction. The pump is installed such that the heat medium, the refrigerant flow, and air for an air-conditioning target space flow in particular directions. 1. An air-conditioning apparatus comprising:a primary-side circuit in which a compressor that compresses refrigerant, a first flow switching device that switches a circulation path of the refrigerant, an outdoor heat exchanger that exchanges heat between the refrigerant and a heat-source-side fluid, a second flow switching device that switches the circulation path of the refrigerant, a first expansion device that is disposed at a pipe between the first flow switching device and the second flow switching device and adjusts a pressure of the refrigerant, and a relay heat exchanger that exchanges heat between the refrigerant and a heat medium different from the refrigerant are connected by pipes and in which the refrigerant circulates;a secondary-side circuit in which the relay heat exchanger, a pump that pressurizes the heat medium, a plurality of indoor heat exchangers, each of which exchanges heat between the heat medium and air for an air-conditioning target space, and heat medium flow control devices, each of which is ...

INTEGRATED EXPANDER-MOTOR COMPRESSOR

An expander and motor-compressor unit is disclosed. The unit includes a casing and an electric motor arranged in the casing. A compressor is arranged in the casing and drivingly coupled to the electric motor through a central shaft. Furthermore, a turbo-expander is arranged for rotation in the casing and is drivingly coupled to the electric motor and to the compressor through the central shaft. 1. An expander and motor-compressor unit comprising:a casing;an electric motor arranged in the casing;a multi-stage compressor drivingly coupled to the electric motor through a central shaft and arranged in the casing;wherein a turbo-expander is arranged for rotation in the casing and is drivingly coupled to the electric motor and to the compressor through the central shaft, wherein the central shaft is supported by at least three radial bearings.2. The expander and motor-compressor unit of claim 1 , wherein the turbo-expander and the compressor are fluidly coupled such that gas expanded through the turbo-expander is delivered to the compressor and compressed thereby.3. The expander and motor-compressor unit of claim 1 , wherein a liquid removal arrangement is positioned between the turbo-expander and the compressor claim 1 , and wherein the liquid removal arrangement is fluidly coupled to a delivery side of the turbo-expander and to a suction side of the compressor claim 1 , such that expanded gas from the turbo-expander flows through the liquid removal arrangement and is subsequently delivered to the suction side of the compressor.4. The expander and motor-compressor unit of claim 1 , wherein the turbo-expander is positioned in an overhung configuration on the central shaft.5. The expander and motor-compressor unit of claim 1 , wherein the electric motor is arranged between the turbo-expander and the compressor.6. The expander and motor-compressor unit of claim 1 , wherein the turbo-expander is arranged in a first casing compartment and the electric motor is arranged in a ...

TWO-STAGE COMPRESSOR

A two-stage compressor includes a casing, a first compression mechanism and a second compression mechanism. The casing has a first compression chamber, a second compression chamber and an oil tank, wherein the first compression chamber communicates with the second compression chamber and the oil tank is located in the second compression chamber. The first compression mechanism is disposed in the first compression chamber. The second compression mechanism is disposed in the second compression chamber and the second compression mechanism corresponds to the oil tank. The first compression mechanism and the second compression mechanism consume different amounts of lubricant oil respectively. 1. A two-stage compressor comprising:a casing having a first compression chamber, a second compression chamber and an oil tank, the first compression chamber communicating with the second compression chamber, the oil tank located in the second compression chamber;a first compression mechanism disposed in the first compression chamber; anda second compression mechanism disposed in the second compression chamber, the second compression mechanism corresponding to the oil tank, the first compression mechanism and the second compression mechanism consuming different amounts of lubricant oil.2. The two-stage compressor of claim 1 , wherein the oil tank stores lubricant oil; when the second compression mechanism is operating claim 1 , the second compression mechanism stirs the lubricant oil to nebulize the lubricant oil.3. The two-stage compressor of claim 2 , wherein an oil separator is connected to the casing claim 2 , the oil separator receives an oil and refrigerant gas mixture from the two-stage compressor claim 2 , separates the lubricant oil from the oil and refrigerant gas mixture claim 2 , and transmits the lubricant oil to the first compression chamber of the two-stage compressor.4. The two-stage compressor of claim 3 , wherein a condenser is connected to the oil separator claim ...

METHOD FOR OPERATING A CHILLER

A method of operating a chiller having a closed refrigerant loop including a compressor, a condenser and an evaporator. The refrigerant used in the loop defining a pressure-enthalpy curve representative of different phases (vapor, liquid and vapor, and liquid) of the refrigerant at different combinations of pressure and enthalpy. The loop defining a process cycle (compression, condensation, expansion, and evaporation) of the refrigerant during operation of the loop relative to the pressure-enthalpy curve of the refrigerant. The method including continuously operating the compressor when a segment of the process cycle corresponds to the refrigerant being in the liquid phase. 1. A chiller system , comprising:a compressor configured to circulate a refrigerant through a refrigerant circuit;a condenser configured to place the refrigerant in thermal communication with a cooling fluid;an evaporator configured to place the refrigerant in thermal communication with a working fluid;a first sensor configured to provide first feedback indicative of a first temperature of the cooling fluid entering the condenser;a second sensor configured to provide second feedback indicative of a second temperature of the working fluid exiting the evaporator; anda controller communicatively coupled to the first sensor and the second sensor, wherein the controller is configured to compare the first feedback to the second feedback, to continuously operate the compressor in response to the first feedback being greater than the second feedback by a predetermined amount, to continuously operate the compressor in response to the first feedback and the second feedback being substantially equal to one another, and to operate the compressor at a minimum speed during free-cooling conditions defined by the second feedback being greater than the first feedback.2. The chiller system of claim 1 , wherein the controller is configured to continuously operate the compressor in response to the second feedback ...

SCREW COMPRESSOR HAVING OIL SEPARATOR AND WATER CHILLING UNIT

The present invention relates to a screw compressor having an oil separator, comprising: a compressor housing with an inlet for a refrigerant gas flow to flow in; an oil separator housing connected to the compressor housing in a fastened and sealed manner and having an outlet for the refrigerant gas flow to flow out; a compressing assembly disposed within the compressor housing and close to the inlet for compressing the refrigerant gas flow; an electric motor for driving the compressing assembly; and an oil supply device for supplying a freezing oil to the compressing assembly; the screw compressor further comprises an oil separator, the oil separator is disposed within the oil separator housing and comprises a first separator and a second separator, wherein the second separator is disposed close to the outlet, and the first separator is disposed between the compressing assembly and the second separator. 1. A screw compressor having an oil separator , said screw compressor comprising: A compressor housing with an inlet for a refrigerant gas flow to flow in;An oil separator housing connected to the compressor housing in a fastened and sealed manner and having an outlet for the refrigerant gas flow to flow out;A compressing assembly disposed within the compressor housing and close to the inlet for compressing the refrigerant gas flow;An electric motor for driving the compressing assembly; andAn oil supply device for supplying a freezing oil to the compressing assembly;Characterized in that the screw compressor further comprises an oil separator, the oil separator is disposed within the oil separator housing and comprises a first separator for first separation of the freezing oil and a second separator for second separation of the freezing oil, wherein the second separator is disposed close to the outlet, and the first separator is disposed between the compressing assembly and the second separator.2. The screw compressor according to claim 1 , characterized in that an ...

ELECTRIC MOTOR, HERMETIC COMPRESSOR, AND REFRIGERATION CYCLE APPARATUS

An electric motor including: a stator having a cylindrical shape and including a stator core and a stator winding wound around the stator core; and a rotor rotatably disposed inside the stator, the stator winding includes a plurality of windings connected in series in each phase, the plurality of windings in each phase are constituted by both copper wire and aluminum wire, and a ratio between the aluminum wire and the copper wire is uniform among phases. 1. An electric motor comprising:a stator having a cylindrical shape and including a stator core and a stator winding wound around the stator core; anda rotor rotatably disposed inside the stator,the stator winding including a plurality of windings connected in series in each phase,the plurality of windings in each phase being constituted by both copper wire and aluminum wire,the plurality of windings in the stator winding being connected in a Y-connection,a winding of the copper wire in each phase being disposed at a power supply line side, anda winding of the aluminum wire in each phase being disposed at a neutral point side.23-. (canceled)4. A hermetic compressor comprising:a compression mechanism that compresses refrigerant gas; and{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the electric motor of that transmits rotation to the compression mechanism so that the refrigerant gas is compressed.'}5. A refrigeration cycle apparatus comprising:{'claim-ref': {'@idref': 'CLM-00004', 'claim 4'}, 'the hermetic compressor of ;'}an outdoor heat exchanger that serves as a condenser in a cooling operation and serves as an evaporator in a heating operation; andan indoor heat exchanger that serves as an evaporator in a cooling operation and serves as a condenser in a heating operation.6. An electric motor comprising:a stator having a cylindrical shape and including a stator core and a stator winding wound around the stator core; anda rotor rotatably disposed inside the stator,the stator winding including a plurality of ...

Interior permanent magnet rotor for a refrigerant compressor

An interior permanent magnet rotor, for a drive unit disposed in the interior of a hermetically sealed housing of a refrigerant compressor, whereas the rotor includes a first axial section with permanent magnets, followed by a second axial section without permanent magnets. In order to reduce the risk of a magnetic short-circuit it is provided that the second axial section, adjacent to the first axial section, includes a first axial subsection with a reduced radial dimension not going beyond the permanent magnets in the first axial section, whereas the axial length of the first axial subsection is smaller than the axial length of the first axial section, and the second axial section, adjacent to its first axial subsection, includes a second axial subsection with a radial dimension larger than the reduced radial dimension of the first axial subsection.

Energy saving system for producing cooled and heated liquid

A system for producing a cooled liquid and a heated liquid. Such a system may be embodied in the form of a unitary apparatus configured to dispense chilled water and near boiling water for human consumption. In one form, there is provided a system for heating and cooling a liquid, the system including: a liquid cooling unit having a heat output component, and a first liquid heater configured to hold and heat a liquid. The first liquid heater is configured to retain a first body of the liquid about the heat output component such that the liquid is heated, and furthermore that a temperature gradient is formed and maintained within the first body of the liquid.

Direct drive refrigerant screw compressor with refrigerant lubricated rotors

Disclosed is a direct-drive refrigerant screw compressor, having: a housing; a compression chamber in the housing; a pair of rotors, each rotor of the pair of rotors being rotationally disposed in the compression chamber and including an outer surface with a screw-geared profile; a fluid being disposed in the compression chamber, the fluid consisting of a working fluid for providing lubrication to each rotor; a first port extending through the housing and configured for directing the fluid toward the compression chamber; and when the compressor is activated, each rotor rotates and the fluid is distributed about each rotor to lubricate each rotor.

COMPRESSOR NOISE REDUCTION

A scroll compressor is disclosed. The compressor includes an enclosure including a compression mechanism that compresses a working fluid. A discharge port discharges a compressed working fluid. A discharge plenum receives the compressed working fluid from the discharge port. A pulsation absorber is disposed within the discharge plenum, the pulsation absorber dividing the discharge plenum into a plurality of volumes. 1. A scroll compressor , comprising: a compression mechanism that compresses a working fluid;', 'a discharge port through which a compressed working fluid is discharged;', 'a discharge plenum which receives the compressed working fluid from the discharge port; and', 'a pulsation absorber disposed within the discharge plenum, the pulsation absorber dividing the discharge plenum into a plurality of volumes., 'an enclosure including2. The scroll compressor according to claim 1 , wherein the pulsation absorber is a porous material disposed perpendicular to a longitudinal axis of the discharge port claim 1 , thereby dividing the discharge plenum into two chambers.3. The scroll compressor according to claim 2 , wherein the pulsation absorber is made of a sintered metal claim 2 , a perforated sheet metal claim 2 , a micro-perforated sheet metal claim 2 , metallic fiber claim 2 , or another pulsation-absorbing medium.4. The scroll compressor according to claim 2 , wherein the pulsation absorber is disposed a distance from the discharge port that is based on absorption of pulsations in the working fluid across a particular frequency range.5. The scroll compressor according to claim 2 , further comprising a tuning member disposed perpendicularly to the pulsation absorber.6. The scroll compressor according to claim 5 , wherein the tuning member is disposed on a side of the pulsation absorber that is relatively away from the discharge port.7. The scroll compressor according to claim 5 , wherein the tuning member forms a plurality of pulsation chambers.8. The scroll ...

PURGING DEVICE, CHILLER EQUIPPED WITH SAME, AND METHOD FOR CONTROLLING PURGING DEVICE

A purging device equipped with: a purging pipe for purging a gas mixture containing a coolant and a non-condensable gas from a chiller; a purging tank for storing the gas mixture purged from the purging pipe; a cooling device which cools the interior of the purging tank and condenses the coolant in the gas mixture; a drainage pipe for discharging the liquid coolant inside the purging tank to the chiller; an exhaust pipe for discharging the non-condensable gas in the gas mixture inside the purging tank to the exterior; and a control unit which stops operation of the purging device when the discharged non-condensable gas amount discharged from the exhaust pipe exceeds the introduced non-condensable gas amount introduced into the chiller. 1. An air bleeding device comprising:an air bleeding pipe through which a mixed gas containing a refrigerant and an uncondensable gas is bled from a chiller;an air bleeding tank in which the mixed gas bled through the air bleeding pipe is stored;a cooler which cools an inside of the air bleeding tank and condenses the refrigerant in the mixed gas;a drain pipe through which a liquid refrigerant in the air bleeding tank is discharged to the chiller;an exhaust pipe through which the uncondensable gas in the mixed gas in the air bleeding tank is discharged to an outside; anda control unit which stops an operation of the air bleeding device in a case where an amount of the uncondensable gas discharged through the exhaust pipe exceeds an amount of the uncondensable gas entering an inside of the chiller.2. The air bleeding device according to claim 1 ,wherein the control unit obtains the amount of the discharged uncondensable gas from a density of the uncondensable gas in the air bleeding tank obtained from a temperature and a pressure in the air bleeding tank and an amount of a gas discharged through the exhaust pipe.3. The air bleeding device according to claim 1 ,wherein the control unit obtains the amount of the entering uncondensable ...

CHILLER PLANT WITH DYNAMIC SURGE AVOIDANCE

Systems, apparatus and methods for efficiently operating a chiller plant while minimizing or eliminating the occurrence of centrifugal compressor surge. Taking into account chiller design specifications and current operating conditions, a compressor lift point at which surge is predicted to occur is established. Minima and maxima for various chiller setpoints that avoid or eliminate the occurrence of compressor surge are imposed on setpoints provided by a conventional optimizing chiller controller. The chiller system is operated in accordance with the resultant anti-surge setpoints. Energy savings is realized by modulating coolant tower flow to enable the compressor to operate at near-surge conditions while preventing the onset of actual surge. 1. A method of operating a chiller system , comprising:determining a predicted surge lift temperature difference of a centrifugal compressor of the chiller system;calculating anti-surge condenser water minimum and maximum temperature limits;calculating anti-surge condenser water minimum and maximum flow rate limits;establishing an anti-surge condenser water temperature setpoint as a provisional condenser water temperature setpoint constrained between the anti-surge condenser water minimum and maximum temperature limits;establishing an anti-surge condenser water flow rate setpoint as the provisional condenser water flow rate setpoint constrained between the anti-surge condenser water minimum and maximum flow rate limits; andoperating the chiller system in accordance with the anti-surge condenser water temperature setpoint and the anti-surge condenser water flow rate setpoint.2. The method of operating a chiller system according to claim 1 , further comprising receiving a provisional entering condenser water temperature setpoint and a provisional condenser water flow rate setpoint from an optimizing controller.3. The method of operating a chiller system according to claim 1 , further comprising:calculating a minimum and a ...

OIL RETURN MANAGEMENT IN A HVAC SYSTEM

Methods, systems, and apparatuses are described to help manage oil return such as in a chiller system of a HVAC system. A refrigerant/oil mixture can be directed out of the evaporator into an oil return heat exchanger that is configured to help vaporize a refrigerant portion of the refrigerant/oil mixture. Superheat refrigerant vapor can be directed from a condenser into the oil return heat exchanger as the heat energy to vaporize the refrigerant portion in the refrigerant/oil mixture. The oil return heat exchanger can be positioned lower than the evaporator so that gravity can help the refrigerant/oil mixture to flow into the oil return heat exchanger. 1. A HVAC system , comprising:a condenser;an evaporator;a compressor; andan oil return heat exchanger;wherein the oil return heat exchanger has an evaporator side configured to receive an refrigerant/oil mixture from the evaporator and a condenser side configured to receive superheat refrigerant vapor from the condenser, and the evaporator side and the condenser side are configured to exchange heat in the oil return heat exchanger.2. The HVAC system of claim 1 , wherein the refrigerant/oil mixture from the evaporator side is directed to the compressor after flowing out of the oil return heat exchanger.3. The HVAC system of claim 1 , wherein the superheat refrigerant vapor from the condenser is directed to the condenser after flowing out of the oil return heat exchanger.4. The HVAC system of claim 1 , wherein the oil return heat exchanger is physically positioned lower than the evaporator.5. The HVAC system of claim 1 , wherein the evaporator side of the oil return heat exchanger has an evaporator-side inlet and an evaporator-side outlet claim 1 , the evaporator-side inlet is configured to receive the refrigerant/oil mixture from the evaporator claim 1 , the evaporator-side outlet is configured to direct the refrigerant/oil mixture to the compressor claim 1 , the evaporator-side outlet is positioned physically higher ...

HIGH PERFORMANCE COMPRESSORS AND VAPOR COMPRESSION SYSTEMS

The present disclosure relates to a new breed of high performance compressors and associated vapor compression systems that can be used in wide ranging refrigeration, cooling and heating applications with significantly increased compressor isentropic efficiency, motor efficiency, reliability and longevity of the motor, the compressor pump and the system as a whole, as well as COP, heating capacity, and SEER of the new vapor compression systems utilizing the new high performance compressors. The design philosophy and modifications to the current configuration of rolling piston rotary compressor to arrive at the high-performance version of the same type will be readily applicable to other types of vapor compression compressors with only minor changes opening the way for adoption of the new design philosophy by the entire compressor industry resulting in serious reduction of carbon footprint for air conditioners, heat pumps and refrigerators worldwide. 137-. (canceled)38. A compressor comprising:at least one pressure containment shell;a motor and a motor heat exchanger, wherein the motor and the motor heat exchanger are positioned in a pressure containment shell of the at least one pressure containment shell;a pump body positioned in a pressure shell of the at least one pressure containment shell;wherein the pump body includes a pump operatively coupled to the motor;wherein the motor heat exchanger is configured to accept refrigerant diverted from a condenser or a high pressure heat exchanger of a refrigeration system, whereby the motor heat exchanger is configured to cool the motor, to decrease operating temperature of the motor, and to increase electrical efficiency of the motor;a compression chamber within the pump body; andat least one supercharging port or valve provided in the pump body leading into the compression chamber configured to receive the diverted refrigerant, after cooling the motor, such that the diverted refrigerant is injected back into the ...

ELECTRONIC CAPACITY CONTROL VALVE FOR PORTABLE SCREW COMPRESSOR

A spiral valve and a screw compressor having a compressor housing and the spiral valve are provided. The spiral valve includes an actuator module disposed adjacent an exterior of the compressor housing, the actuator module includes an electric motor, a gearbox mechanically coupled to the electric motor to transmit torque from the electric motor, a shutter coupled to the gearbox to rotate in response to a transmitted torque from the electric motor, wherein the shutter is positioned to open and close one or more of a plurality of bypass ports formed in the compressor housing based on the rotational position of the shutter, wherein the compression length of the screw compressor may be controlled by controlling the opening and closing of the one or more bypass ports. 1. A spiral valve for a screw compressor having a compressor housing , the spiral valve comprising: an electric motor;', 'a gearbox mechanically coupled to the electric motor to transmit a torque from the electric motor;, 'an actuator module disposed adjacent an exterior of the compressor housing, the actuator module comprisinga shutter coupled to the gearbox to rotate in response to the transmitted torque from the electric motor, wherein the shutter is positioned to open and close one or more of a plurality of bypass ports formed in the compressor housing based on a rotational position of the shutter,wherein a compression length of the screw compressor may be controlled by controlling the opening and closing of the one or more bypass ports.2. The spiral valve of claim 1 , wherein the plurality of bypass ports includes a first bypass port and a second bypass port adjacent to the first bypass port;within a distance between the first bypass port and the second bypass port is less than 120% of a manufacturing tolerance of the compressor housing, and greater than or equal to 100% of the manufacturing tolerance of the compressor housing.3. The spiral valve of claim 1 , wherein the plurality of bypass ports ...

MUFFLER WITH METALLIC MESHED RINGS

Disclosed is a muffler for a water-cooled chiller or air-cooled of a vapor-compression or absorption refrigeration system, the muffler having: an upstream case () having a fluid inlet (); a downstream case () connected to the upstream case at a downstream end of the upstream case, the downstream case having a fluid outlet (); the upstream case having a plurality of axially adjacent outer muffler rings () and a plurality of axially adjacent inner muffler rings (), the outer muffler rings being axially coextensive and a radially exterior to the inner muffler rings and defining a fluid inlet passage () therebetween, wherein the outer muffler rings and inner muffler rings are a metal mesh material. 1. A muffler for a chiller of a vapor-compression or absorption refrigeration system , the muffler comprising:an upstream case having a fluid inlet;a downstream case connected to the upstream case at a downstream end of the upstream case, the downstream case having a fluid outlet;the upstream case having a plurality of axially adjacent outer muffler rings and a plurality of axially adjacent inner muffler rings, the outer muffler rings being axially coextensive and a radially exterior to the inner muffler rings and defining a fluid inlet passage therebetween, wherein the outer muffler rings and inner muffler rings are a metal mesh material.2. The muffler of wherein one or both of the outer muffler rings and inner muffler rings are steel.3. The muffler of wherein one or both of the outer muffler rings and inner muffler rings are stainless steel.4. The muffler of wherein one or both of the outer muffler rings and inner muffler rings are SAE 304A stainless steel.5. The muffler of wherein one or both of the outer muffler rings and inner muffler rings are 0.008 inch wall thickness type SAE 304A stainless steel with a mesh density of twelve (12) percent and a weight of 6.23 ounces.6. The muffler of wherein the upstream case comprises N sets of muffler rings claim 1 , the N sets of ...

REFRIGERATOR

The purpose of the present invention is to provide a refrigerator in which the capacity of an oil tank can be made smaller than in the prior art while a foaming phenomenon is addressed. The refrigerator is provided with: a refrigeration cycle which includes a condenser, an evaporator, and an electric compressor having a compression mechanism to be driven by a motor and in which a refrigerant circulates; an oil tank in which a lubricating oil is stored; a heater which is set in the oil tank and which heats the lubricating oil; a lubricating oil supply line which is connected to the oil tank and which supplies the lubricating oil from the oil tank into a housing having the motor housed therein; a lubricating oil discharge line which returns the lubricating oil from the housing back to the oil tank; a pressure equalizing pipe which has one end connected to the oil tank and the other end connected to the refrigeration cycle; and a buffer tank which is set to the pressure equalizing pipe, which receives the refrigerant and the lubricating oil flowing out from the oil tank, and in which the lubricating oil is stored. 1. A chiller comprising:a refrigerating cycle that includes an electric compressor having a compression mechanism driven by a motor, a condenser, and an evaporator, and in which a refrigerant is circulated;an oil tank that stores a lubricant;a heater that is installed inside the oil tank so as to heat the lubricant;an oil circulation pipe that is connected to the oil tank so as to supply the lubricant from the oil tank into a housing for accommodating the motor and to return the lubricant from the housing to the oil tank;a pressure equalizing pipe, one end of which is connected to the oil tank, separately from the oil circulation pipe, and the other end of which is connected to the refrigerating cycle; anda buffer tank that is installed in the pressure equalizing pipe, and that receives the refrigerant and the lubricant which flow out of the oil tank so as to ...

Active clearance management in screw compressor

A compressor includes a housing defining a working chamber. The housing further includes a bore and an endplate disposed toward a discharge end. The compressor further includes a rotor having helical threads, the rotor being configured to be housed in the bore, a rotor clearance, a controllable bearing supporting the rotor, and a controller configured to control the controllable bearing such that the controllable bearing moves the rotor in a manner to reduce and/or enlarge the rotor clearance.

ELECTRIC COMPRESSOR

An electric compressor includes a housing, a compression portion that compresses refrigerant, an electric motor that drives the compression portion through a rotary shaft, a circuit board that drives and controls the electric motor, and a connector that is fixed to the housing and configured to electrically connect an external power source to the circuit board. The connector includes a first terminal portion extending in an axial direction of the rotary shaft and a second terminal portion extending in a radial direction of the housing and having a connecting portion through which the first terminal portion and the second terminal portion are connected to each other. The second terminal portion is adapted to elastically hold the first terminal portion at the connecting portion in such a manner as to permit the first terminal portion to move relative to the second terminal portion in the axial direction of the rotary shaft. 1. An electric compressor comprising:a housing;a compression portion that is disposed in the housing and compresses refrigerant;an electric motor that is disposed in the housing, has a rotary shaft, and drives the compression portion through the rotary shaft;a circuit board that is disposed in the housing and drives and controls the electric motor; anda connector that is fixed to the housing and configured to electrically connect an external power source to the circuit board, whereinthe connector includes a first terminal portion extending in an axial direction of the rotary shaft and a second terminal portion extending in a radial direction of the housing and having a connecting portion through which the first terminal portion and the second terminal portion are connected to each other, andthe second terminal portion is adapted to elastically hold the first terminal portion at the connecting portion in such a manner as to permit the first terminal portion to move relative to the second terminal portion in the axial direction of the rotary shaft.2. ...

SCROLL COMPRESSOR

A scroll compressor is disclosed. The scroll compressor includes an shell, a fixed scroll, a housing and an orbiting scroll. The fixed scroll and the housing are disposed in the shell and fixed relative to each other. An outer peripheral surface of the housing and an inner peripheral surface of the shell are fitted to each other. The orbiting scroll is disposed between the fixed scroll and the housing. The fixed scroll is formed therein with a first injection passage, the housing is formed therein with a second injection passage, a port of the first injection passage and a port of the second injection passage face each other, so that the first injection passage and the second injection passage communicate with each other. The scroll compressor further includes an injection tube assembly, the injection tube assembly is disposed in the shell. The injection tube assembly includes: a tube, and a first tube joint and a second tube joint respectively disposed at two ends of the tube, the first tube joint passes through the shell to communicate with the outside, and the second tube joint is inserted and fitted in the second injection passage. 1. A scroll compressor , comprising:a shell;a fixed scroll;a housing, wherein the fixed scroll and the housing are disposed in the shell and are fixed relative to each other, and an outer peripheral surface of the housing and an inner peripheral surface of the shell are fitted to each other; andan orbiting scroll disposed between the fixed scroll and the housing,wherein,the fixed scroll is formed therein with a first injection passage, the housing is formed therein with a second injection passage, and a port of the first injection passage and a port of the second injection passage face each other, so that the first injection passage and the second injection passage communicate with each other; andthe scroll compressor further comprises an injection tube assembly, the injection tube assembly is disposed in the shell, the injection tube ...

Heat source unit and refrigeration cycle apparatus

A heat source unit and a refrigeration cycle apparatus that are able to reduce damage to a connection pipe when a refrigerant containing at least 1,2-difluoroethylene is used are provided. An outdoor unit ( 20 ) that is connected via a liquid-side connection pipe ( 6 ) and a gas-side connection pipe ( 5 ) to an indoor unit ( 30 ) including an indoor heat exchanger ( 31 ) and that is a component of an air conditioner ( 1 ) includes a compressor ( 21 ) and an outdoor heat exchanger ( 23 ). A refrigerant containing at least 1,2-difluoroethylene is used as a refrigerant. A design pressure of the outdoor unit ( 20 ) is lower than 1.5 times a design pressure of each of the liquid-side connection pipe ( 6 ) and the gas-side connection pipe ( 5 ).

CENTRIFUGAL COMPRESSOR WITH SURGE CONTROL

A centrifugal compressor for a chiller includes a casing, an inlet guide vane, an impeller downstream of the inlet guide vane, a motor and a diffuser. The casing has inlet and outlet portions with the inlet guide vane disposed in the inlet portion. The impeller is rotatable about a rotation axis defining an axial direction, and the impeller is adjustably mounted within the casing along the axial direction between at least a first flow rate position and a second flow rate position. The motor rotates the impeller. The diffuser is disposed in the outlet portion downstream from the impeller with a outlet port of the outlet portion being disposed between the impeller and the diffuser. 1. A centrifugal compressor adapted to be used in a chiller , the centrifugal compressor comprising:a casing having an inlet portion and an outlet portion;an inlet guide vane disposed in the inlet portion;an impeller disposed downstream of the inlet guide vane, the impeller being rotatable about a rotation axis defining an axial direction, and the impeller being adjustably mounted within the casing along the axial direction between at least a first flow rate position and a second flow rate position;a motor arranged and configured to rotate the impeller; anda diffuser disposed in the outlet portion downstream from the impeller with an outlet port of the outlet portion being disposed between the impeller and the diffuser.2. The centrifugal compressor according to claim 1 , further comprisingan impeller axial position control mechanism configured to control adjustment of the impeller between at least the first and second flow rate positions.3. The centrifugal compressor according to claim 2 , whereinthe impeller is attached to a shaft arranged and configured to be rotated by the motor,the impeller axial position control mechanism includes a thrust bearing attached to the shaft, and the thrust bearing is adjustably mounted within the casing to move the impeller between at least the first and ...

COMPRESSOR AND REFRIGERATION CYCLE APPARATUS

A compressor is configured to form a refrigerant circuit using refrigerant containing a substance having such a property as to cause a disproportionation reaction, and includes a shell serving as an outer shell, a compression chamber installed inside the shell, the compression chamber being configured to compress the sucked refrigerant, cause the compressed refrigerant to flow into the shell to place the shell under a high-pressure refrigerant atmosphere, and discharge the compressed refrigerant externally, and a motor configured to feed power to the compressor. With the configuration described above, a disproportionation reaction is made unlikely to occur. As a result, the substance having such a property as to cause a disproportionation reaction can be used safely as the refrigerant. 1. A compressor configured to form a part of a refrigerant circuit circulating refrigerant , the compressor comprising:a hermetic container serving as an outer shell;a compression chamber installed inside the hermetic container, the compression chamber being configured to compress the refrigerant containing a substance having such a property as to cause a disproportionation reaction, which is sucked, cause the compressed refrigerant to flow into the hermetic container to place the hermetic container under a high-pressure refrigerant atmosphere, and discharge the compressed refrigerant externally; anda motor configured to feed power to the compression chamber,{'sup': '10', 'refrigerating machine oil having miscibility with the refrigerant and having a volume resistivity at 20 degrees Celsius of 2×10Ω·m or more being filled.'}2. The compressor of claim 1 , wherein the refrigerant in a two-phase state is sucked.3. The compressor of claim 2 , wherein the refrigerant in the two-phase state is quality of 0.8 or higher and 0.99 or lower.4. The compressor of claim 1 , wherein an insulating material for the motor comprises a resin material.5. The compressor of claim 4 , wherein one or more ...

SCREW COMPRESSOR FOR HVAC

A screw compressor for a heating, ventilation, and air conditioning (HVAC) system. The screw compressor includes a housing having an inlet end and an outlet end for refrigerant to pass into and out of the housing. A motor is within the housing. A plurality of screw sets are arranged about the motor. The screw sets receive refrigerant entering through the inlet, compress the refrigerant between meshed rotors of the plurality of screw sets, and direct refrigerant out of the housing through the outlet end of the housing. 1. A screw compressor for a heating , ventilation , and air conditioning (HVAC) system , the screw compressor comprising:a housing having an inlet end and an outlet end for refrigerant to pass into and out of the housing;a motor within the housing; anda plurality of screw sets arranged about the motor, the screw sets receive refrigerant entering through the inlet, compress the refrigerant between meshed rotors of the plurality of screw sets, and direct refrigerant out of the housing through the outlet end of the housing2. The screw compressor of claim 1 , wherein the motor is arranged along a longitudinal axis of the housing that extends from the inlet end to the outlet end along an axial center of the housing.3. The screw compressor of claim 1 , wherein the plurality of screw sets are spaced apart about the motor.4. The screw compressor of claim 1 , further comprising:a rotatable inlet cylinder at the inlet end of the housing having an inlet for refrigerant to pass into the rotatable inlet cylinder and then into the housing through the inlet end of the housing; anda rotatable outlet cylinder at the outlet end of the housing having an outlet for refrigerant that has passed through the housing to exit the rotatable outlet cylinder.5. The screw compressor of claim 1 , further comprising:a seal plate mounted at the rotatable outlet cylinder such that the rotatable outlet cylinder is between the seal plate and the housing; the seal plate restricts rotation ...

SCROLL COMPRESSOR

A scroll compressor includes an orbiting scroll including an end plate and a spiral element on the end plate, a fixed scroll including an end plate and a spiral element on the end plate, and an Oldham ring including a support. The scroll compressor satisfies a relation of δ1>δ2, where δ1 denotes each of the axial length of a gap between the tip of the spiral element of the orbiting scroll and the end plate of the fixed scroll and a gap between the tip of the spiral element of the fixed scroll and the end plate of the orbiting scroll, and δ2 denotes the axial length of a gap between the end plate of the orbiting scroll and the support of the Oldham ring. 1. A scroll compressor , comprising:a fixed scroll including an end plate and a spiral element on the end plate;an orbiting scroll including an end plate and a spiral element on the end plate of the orbiting scroll, the spiral element of the orbiting scroll engaging with the spiral element of the fixed scroll to define a compression chamber;a crankshaft configured to drive the orbiting scroll;a frame supporting the orbiting scroll across the orbiting scroll from the fixed scroll; andan Oldham ring disposed between the end plate of the orbiting scroll and the frame, the Oldham ring being configured to prevent the orbiting scroll from rotating to allow the orbiting scroll to orbit against the fixed scroll,the Oldham ring including a ring portion that is annular, a surface of the ring portion facing the end plate of the orbiting scroll including a support to contact the orbiting scroll when the orbiting scroll tilts during an orbiting motion of the orbiting scroll,{'b': 1', '2', '1', '2, 'the scroll compressor satisfying a relation of δ>δ, where δ denotes an axial length of each of a gap between a tip of the spiral element of the orbiting scroll and the end plate of the fixed scroll and a gap between a tip of the spiral element of the fixed scroll and the end plate of the orbiting scroll, and δ denotes an axial length ...

COMPOSITION CONTAINING REFRIGERANT AND APPLICATION THEREOF

The present invention provides a composition containing a refrigerant having characteristics equal to or higher than those of R23. Specifically, the present invention provides a composition containing a refrigerant, wherein the refrigerant contains (a) at least one perfluorocarbon (PFC) selected from the group consisting of PFC-14, PFC-116, PFC-c216, FFC-218, PFC-c318, and PFC-31-10, and (b) an unsaturated compound. 117-. (canceled)18. A composition comprising a refrigerant , wherein the refrigerant comprises(a) PFC-14 as perfluorocarbon (PFC),(b) an unsaturated compound, and(c) HFC.19. The composition according to claim 18 , wherein the (b) unsaturated compound is at least one compound selected from the group consisting of HFO-1234yf claim 18 , HFO-1234ze(E) claim 18 , HFO-1234ze(Z) claim 18 , HFO-1225ye claim 18 , FO-1114 claim 18 , HFO-1123 claim 18 , HFO-1132a claim 18 , HFO-1132(E) claim 18 , HFO-1132(Z) claim 18 , HCFO-1233zd claim 18 , HCFO-1224yd claim 18 , and HCFO-1122a.20. The composition according to claim 18 , wherein the (c) HFC is at least one compound selected from the group consisting of HFC-23 claim 18 , HFC-32 claim 18 , HFC-125 claim 18 , HFC-143a claim 18 , HFC-134a claim 18 , and HFC-134.21. The composition according to claim 18 , wherein the (b) unsaturated compound is at least one compound selected from the group consisting of HFO-1123 claim 18 , HFO-1132a claim 18 , and HFO-1132(E).22. The composition according to claim 21 , wherein the (c) HFC is at least one compound selected from the group consisting of HFC-23 claim 21 , HFC-32 claim 21 , and HFC-125.23. The composition according to claim 21 , wherein the (b) unsaturated compound is HFO-1132a.24. The composition according to claim 18 , wherein the (b) unsaturated compound is at least one compound selected from the group consisting of HFO-1234yf claim 18 , HFO-1234ze(E) claim 18 , HFO-1123 claim 18 , and HFO-1132(E) claim 18 , and the (c) HFC is at least one compound selected from the ...

Refrigeration valve block

A service valve assembly that is designed to minimize leakage by reducing the number of leakage paths from the valve assembly. In addition, the service valve assembly is designed to permit connection to many different refrigeration systems and has higher flow capacity. The valve assembly is engageable by current servicing tools so that purchase of new service tools is not required. In the valve assembly, the service connection is designed as part of the shut-off valve and communicates with the condenser side port. Therefore, initial processing through the condenser side port and subsequent processing through the evaporation side port occur through the combined service connection and shut-off valve structure. Once installed, the described valve assembly has one leak path versus two leak paths in known valve assemblies.

METHOD FOR OPERATING A CHILLER

A method of operating a chiller having a closed refrigerant loop including a compressor, a condenser and an evaporator. The refrigerant used in the loop defining a pressure-enthalpy curve representative of different phases (vapor, liquid and vapor, and liquid) of the refrigerant at different combinations of pressure and enthalpy. The loop defining a process cycle (compression, condensation, expansion, and evaporation) of the refrigerant during operation of the loop relative to the pressure-enthalpy curve of the refrigerant. The method including continuously operating the compressor when a segment of the process cycle corresponds to the refrigerant being in the liquid phase. 1. A chiller system , comprising:a compressor configured to circulate a refrigerant through a refrigerant circuit;a condenser configured to place the refrigerant in thermal communication with a cooling fluid;an evaporator configured to place the refrigerant in thermal communication with a working fluid; and receive first sensor feedback indicative of a first temperature or pressure of the cooling fluid entering the condenser;', 'receive second sensor feedback indicative of a second temperature or pressure of the working fluid exiting the evaporator;', 'continuously operate the compressor in response to the first feedback being greater than the second feedback; and', 'operate the compressor during free-cooling conditions defined by the second feedback being greater than the first feedback., 'a controller configured to2. The chiller system of claim 1 , wherein the controller is configured to operate the compressor at a minimum speed during the free-cooling conditions defined by the second feedback being greater than the first feedback.3. The chiller system of claim 1 , wherein the controller is configured to continuously operate the compressor in response to the first feedback and the second feedback being substantially equal to one another.4. The chiller system of claim 1 , wherein the compressor ...

AIR-CONDITIONING APPARATUS AND METHOD OF CONTROLLING THE SAME

An air-conditioning apparatus including heat source apparatuses each including a compressor and an accumulator includes: a refrigerant amount calculation unit that calculates an amount of the refrigerant accumulated in the accumulator in one of the heat source apparatuses that is to be controlled; a refrigerant differential amount calculation unit configured to calculate, when the number of the heat source apparatuses is two, a differential amount between the calculated amount and an amount of the refrigerant in the accumulator in the other heat source apparatus, and calculate, when the number of the heat source apparatuses is three or more, a differential amount between the calculated amount of the refrigerant and an average amount of amounts of the refrigerant accumulated in the accumulators in the heat source apparatuses; and a liquid equalization control unit that controls the heat source apparatus to be controlled, based on the calculated differential amount. 1. An air-conditioning apparatus including a plurality of heat source apparatuses each including a compressor and an accumulator configured to accumulate refrigerant to be compressed by the compressor , the air-conditioning apparatus comprising:a refrigerant amount calculation unit configured to calculate an amount of the refrigerant accumulated in the accumulator in one of the plurality of heat source apparatuses that is to be controlled;a refrigerant differential amount calculation unit configured to calculate, in a case where the number of the plurality of heat source apparatuses is two, a differential amount between the amount of the refrigerant that is calculated by the refrigerant amount calculation unit and an amount of the refrigerant in the accumulator in an other one of the heat source apparatuses, and configured to calculate, in a case where the number of the plurality of heat source apparatuses is three or more, a differential amount between the amount of the refrigerant that is calculated by ...

TWO-STAGE CENTRIFUGAL COMPRESSOR WITH EXTENDED RANGE AND CAPACITY CONTROL FEATURES

One exemplary embodiment of this disclosure relates to a centrifugal refrigerant compressor system. The system includes a condenser, an evaporator, and an economizer between the condenser and the evaporator. The system further includes a centrifugal compressor having a first impeller and a second impeller downstream of the first impeller. The compressor includes at least one port. Fluid from a recirculation flow path and an economizer flow path is introduced into a main flow path of the compressor by way of the at least one port. 1. A centrifugal refrigerant compressor system , comprising:a condenser;an evaporator;an economizer between the condenser and the evaporator; anda centrifugal compressor including a first impeller and a second impeller downstream of the first impeller, the compressor including at least one port provided at a location downstream of the first impeller, wherein fluid from a recirculation flow path and an economizer flow path is introduced into a main flow path of the compressor by way of the at least one port.2. The refrigerant system as recited in claim 1 , wherein the recirculation flow path is sourced from an outlet of the compressor claim 1 , and wherein the economizer flow path is sourced from the economizer3. The refrigerant system as recited in claim 1 , wherein the at least one port is a single port provided downstream of the first impeller and upstream of the second impeller.4. The refrigerant system as recited in claim 3 , wherein the port is provided adjacent a return channel.5. The refrigerant system as recited in claim 4 , wherein the compressor includes one of (1) a variable geometry diffuser and (2) inlet guide vanes.6. The refrigerant system as recited in claim 5 , wherein the compressor includes a variable geometry diffuser downstream of the first impeller claim 5 , and wherein the compressor further includes a stationary vane diffuser downstream of the second impeller.7. The refrigerant system as recited in claim 5 , wherein ...

Screw Compressor

A compressor () comprises a housing () having a first port () and a second port (). A male rotor () has a working portion () having a plurality of lobes () of a count (N) and at least a first shaft portion () protruding beyond a first end () of the male rotor working portion and mounted for rotation about a first axis (). A female rotor () has a working portion () having a plurality of lobes () of a count (N) and mounted for rotation about a second axis () so as to be enmeshed with the male rotor working portion. An electric motor () is within the housing and has a stator () and a rotor () mounted to the first shaft portion. The compressor has no additional compressor rotors. The lobe count of the male rotor is less than the lobe count of the female rotor. A combined lobe count (N+N) is at least fifteen. 2. The compressor of wherein:the compressor has no additional compressor rotors.3. The compressor of wherein:{'sub': M', 'F, 'the combined lobe count (N+N) is fifteen to twenty-one.'}4. The compressor of wherein:{'sub': M', 'F, 'the lobe count (N) of the male rotor and the lobe count (N) of the female rotor are no more than one different from each other.'}5. The compressor of wherein:{'sub': M', 'F, 'the lobe count (N) of the male rotor is one less than the lobe count (N) of the female rotor.'}6. The compressor of wherein one of:the lobe count of the male rotor is seven and the lobe count of the female rotor is eight;the lobe count of the male rotor is eight and the lobe count of the female rotor is nine;the lobe count of the male rotor is nine and the lobe count of the female rotor is ten; andthe lobe count of the male rotor is ten and the lobe count of the female rotor is eleven.7. The compressor of wherein one or both of:a tip-to-root ratio of the lobes of the female rotor is no more than 1.50:1; anda tip-to-root ratio of the lobes of the male rotor is no more than 1.42:1.8. The compressor of wherein one or both of:the tip-to-root ratio of the lobes of the female ...

COMPRESSOR AND REFRIGERATION DEVICE

A compressor and a refrigeration device are provided. The compressor has a casing and a main frame disposed in the casing. The main frame has a guide structure configured to position the main frame. By coordination between the guide structure and a tooling, the process for positioning the main frame can be effectively simplified, the efficiency of positioning the main frame can be improved, and the assembly operation by workers can be facilitated. 1. A compressor comprising:a casing; anda main frame, being disposed in the casing,wherein the main frame comprises a guide structure, and the guide structure is configured to position the main frame.2. The compressor according to claim 1 , wherein the main frame further comprises a body claim 1 , and the guide structure comprises:a guiding cavity, wherein the guiding cavity is disposed in the body and an end of the guiding cavity is open; anda centering cavity, wherein the centering cavity is disposed in the body and communicates with the guiding cavity.3. The compressor according to claim 2 , wherein the centering cavity comprises:a first sub-cavity, being disposed in the body and communicating with the guiding cavity; anda second sub-cavity, being disposed between the guiding cavity and the first sub-cavity, wherein the inner wall of the second sub-cavity is set inclined.4. The compressor according to claim 3 , further comprising:a rotating shaft, being disposed in the casing, wherein the guiding cavity and the centering cavity are distributed along an axis direction of the rotating shaft; anda first vortex disk, being connected with the rotating shaft and supported on the main frame.5. The compressor according to claim 4 , wherein:a straight line which a bus of the inner wall of the second sub-cavity located forms an included angle with an axis of the rotating shaft, andthe included angle is greater than or equal to 5°.6. The compressor according to claim 4 , wherein:the main frame is sectioned along a direction ...

REFRIGERATION APPARATUS

To reduce the possibility that temperature of refrigerant discharged from a compressor of a refrigeration apparatus becomes excessively high by controlling torque of a motor built into the compressor, the compressor includes the motor having rotation thereof controlled by inverter control. An inverter controller controls torque of the motor using inverter control when operation frequency of the compressor is at least one value within a range of from 10 Hz to 40 Hz. When at least the operation frequency is within the range of from 10 Hz to 40 Hz, torque of the motor is controlled, and under a predetermined condition in which temperature of refrigerant discharged from the compressor easily becomes excessively high, a device controller controls devices provided in a refrigerant circuit such that refrigerant sucked into the compressor is placed in a wet vapor state. 1. A refrigeration apparatus comprising:a compressor that has a built-in motor having rotation thereof controlled by inverter control, the compressor being configured to compress refrigerant that flows through a refrigerant circuit;an inverter controller that controls torque of the motor through the inverter control when operation frequency of the compressor is at least one value within a range of from 10 Hz to 40 Hz; anda device controller that, when at least the operation frequency is within the range of from 10 Hz to 40 Hz, torque of the motor is controlled, and when it is determined that a predetermined condition is satisfied, controls devices provided in the refrigerant circuit such that refrigerant sucked into the compressor is placed in a wet vapor state, whereinthe predetermined condition is one condition selected from among: a condensation temperature condition in which a condensation temperature of the refrigerant circuit is 45° C. or higher, a high-pressure condition in which pressure on a high-pressure side of the refrigerant circuit is a predetermined pressure or more, a pressure difference ...

METHOD OF CONTROL FOR ECONOMIZER OF TRANSPORT REFRIGERATION UNITS

A method of operating a refrigeration system includes initiating a compressor shutdown operation, determining a difference in a saturation temperature at a port of a compressor of the refrigeration system and an ambient temperature and comparing the difference in the saturation temperature and ambient temperature with a threshold. If the difference in the saturation temperature and ambient temperature is less than or equal to the threshold, a pump down operation is performed and if the difference in the saturation temperature and ambient temperature exceeds the threshold, a compressor shutdown operation is completed. 1. A method of operating a refrigeration system comprising:initiating a compressor shutdown operation;determining a difference in a saturation temperature at a port of a compressor of the refrigeration system and an ambient temperature; andcomparing the difference in the saturation temperature and ambient temperature with a threshold;wherein if the difference in the saturation temperature and ambient temperature is less than or equal to the threshold, performing a pump down operation; andwherein if the difference in the saturation temperature and ambient temperature exceeds the threshold, completing the compressor shutdown operation.2. The method of claim 1 , further comprising calculating the saturation temperature at the port of the compressor.3. The method of claim 2 , wherein calculating the saturation temperature is performed using the return air temperature to an evaporator of the refrigeration system.4. The method of claim 1 , wherein the threshold is a predetermined limit of about 10 degrees Fahrenheit.5. The method of claim 1 , wherein performing the pump down operation includes operating an electronic valve assembly of the refrigeration system.6. The method of claim 5 , wherein operating the electronic valve assembly of the refrigeration system includes closing the electronic valve assembly to reduce a pressure within an evaporator of the ...

SCROLL COMPRESSOR AND REFRIGERATION CYCLE APPARATUS

A scroll compressor includes a shell, a fixed scroll and an orbiting scroll disposed in the shell, a first scroll wrap and a second scroll wrap that are provided in the fixed scroll and the orbiting scroll, respectively, and that are engaged with each other to form a plurality of compression chambers, a crankshaft that causes the orbiting scroll to perform eccentric revolving motion, a tip seal member that is inserted in the tip of the second scroll wrap along the spiral direction and that is in sliding contact with the first baseplate of the fixed scroll, and injection ports that are provided through the first baseplate of the fixed scroll and that introduce refrigerant at an intermediate pressure between suction pressure and discharge pressure into the compression chambers from the outside of the shell. 1. A scroll compressor comprising:a shell;a fixed scroll and an orbiting scroll disposed in the shell;scroll wraps provided respectively in the fixed scroll and the orbiting scroll, the scroll wraps being engaged with each other to form a plurality of compression chambers;a crankshaft configured to cause the orbiting scroll to perform eccentric revolving motion;a tip seal member inserted in a tip of each of the scroll wraps of the orbiting scroll along a spiral direction and being in sliding contact with a baseplate of the fixed scroll; andinjection ports provided through the baseplate of the fixed scroll and configured to introduce refrigerant having an intermediate pressure between suction pressure and discharge pressure into the compression chambers from an outside of the shell,whereinthe refrigerant is composed only of carbon dioxide or is a mixed refrigerant containing carbon dioxide, andeach of the injection ports has a diameter ϕinj and the tip seal member has a width TIP in a direction perpendicular to the spiral direction, the diameter ϕinj and the width TIP having a relationship of ϕinj≤0.95 ×TIP.2. The scroll compressor of claim 1 , wherein the injection ...

ZERO-LOAD OUTPUT NON-STOP CONTROL METHOD AND APPARATUS, AND UNIT

Disclosed in the present invention are a zero-load output non-stop control method and apparatus, and a unit. The apparatus comprises: a three-way valve, provided at an exhaust port of a compressor; a mixing tank, provided between an air suction port of the compressor and a condenser and used for mixing a refrigerant discharged by the compressor with a refrigerant throttled by the condenser; a first electronic expansion valve, provided on a first pipeline from the condenser to the mixing tank and sued for controlling the amount of the refrigerant throttled by the condenser and entering the mixing tank; and an electromagnetic valve, provided on a second pipeline between the three-way valve and the mixing tank and used for controlling the amount of the refrigerant discharged by the compressor and directly entering the mixing tank. 1. A load control device , comprising:a three-way valve, provided at an exhaust outlet of a compressor;a mixing tank, provided between a suction inlet of the compressor and a condenser, and configured to mix refrigerant discharged from the compressor with refrigerant throttled through the condenser;a first electronic expansion valve, provided on a first pipeline between the condenser and the mixing tank, and configured to control an amount of the refrigerant throttled by the condenser and entering the mixing tank;an electromagnetic valve, provided on a second pipeline between the three-way valve and the mixing tank, and configured to control an amount of the refrigerant discharged from the compressor and directly entering the mixing tank.2. The device according to claim 1 , further comprising:a second electronic expansion valve, provided between the condenser and an evaporator, and configured to control an amount of refrigerant throttled by the condenser and entering the evaporator.3. The device according to claim 2 , further comprising:a controller, configured to control actions of the first electronic expansion valve, the second electronic ...

ELECTRIC COMPRESSOR, AND REFRIGERATION AIR-CONDITIONING APPARATUS

An electric compressor is provided which has: in a sealed container, a compression mechanism to compress a refrigerant and an electric motor to drive the compression mechanism, wherein the refrigerant contains 20% by mass or more of hydrofluoroolefin, and a refrigerator oil stored in the sealed container contains; polyvinyl ether as a base oil; an alicyclic epoxy compound in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil; an aliphatic epoxy compound in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil; and tertiary phosphate in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil. 1. An electric compressor comprising;in a sealed container, a compression mechanism to compress a refrigerant and an electric motor to drive the compression mechanism,wherein the refrigerant contains 20% by mass or more of hydrofluoroolefin, and polyvinyl ether as a base oil,', 'an alicyclic epoxy compound in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil,', 'an aliphatic epoxy compound in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil, and', 'tertiary phosphate in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil., 'a refrigerator oil stored in the sealed container contains'}2. The electric compressor according to claim 1 , whereinthe electric motor drives the compression mechanism through a rotation axis supported by a rolling bearing to be lubricated with the refrigerator oil.3. The electric compressor according to claim 1 , whereinthe hydrofluoroolefin is at least one selected from 2,3,3,3-tetrafluoropropene, 1,3,3,3-tetrafluoropropene, trifluoroethene, and 3,3,3-trifluoropropene.4. The electric compressor according to claim 1 , whereinthe alicyclic epoxy compound is 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate.5. The electric compressor according to claim 1 , ...

COMPRESSION DEVICE AND CONTROL MASS FLOW SEPARATION METHOD

A device for compression of a gaseous fluid, in particular of a refrigerant. The device comprises a housing with a suction pressure chamber and a high pressure chamber, a compression mechanism as well as a configuration developed in the proximity of the high pressure chamber, for the separation of a control mass flow from a fluid-lubricant mixture for the control of the compression mechanism. The configuration is developed and disposed with a first flow duct for diverting a main mass flow of the compressed fluid-lubricant mixture from the device and a second flow duct for conducting the control mass flow within the device to the suction pressure chamber in such manner as to separate a mass flow of the gaseous fluid as a control mass flow. A method for the separation of a control mass flow is also provided. 110.-. (canceled)11. A device for the compression of a gaseous fluid comprising a housing with a suction pressure chamber and a high pressure chamber , a compression mechanism as well as a configuration implemented in the proximity of the high pressure chamber for the separation of a control mass flow from a fluid-lubricant mixture for the control of the compression mechanism , wherein the configuration is developed and disposed with a first flow duct for diverting a main mass flow of the compressed fluid-lubricant mixture from the device and a second flow duct for conducting the control mass flow within the device to the suction pressure chamber , in such manner as to separate a mass flow of the gaseous fluid as the control mass flow.12. A device as in claim 11 , wherein the second flow duct of the configuration claim 11 , for the diversion of the control mass flow within a calm-flow region of the high pressure chamber claim 11 , is disposed such that it opens out into the high pressure chamber.13. A device as in claim 12 , wherein the flow ducts within the configuration are developed isolated from one another and are oriented extending in a longitudinal ...

Method of Cooling Boil-off Gas and Apparatus Therefor

A method of cooling a boil-off gas (BOG) stream from a liquefied gas tank comprising at least the step of heat exchanging the BOG stream with a first refrigerant in a heat exchanger, the heat exchanger having an entry port and a warmer exit port, and comprising at least the steps of: (a) passing the first refrigerant into the entry port of the heat exchanger and into a first zone of the heat exchanger to exchange heat with the BOG stream, to provide a first warmer refrigerant stream; (b) withdrawing the first warmer refrigerant stream from the heat exchanger at an intermediate exit port between the entry port and the warmer exit port; (c) admixing the first warmer refrigerant stream with an oil-containing refrigerant stream to provide a combined refrigerant stream; (d) passing the combined refrigerant stream into the heat exchanger through an entry port located in a second zone of the heat exchanger that is warmer than the first zone; (e) passing the combined refrigerant stream out of the heat exchanger through the warmer exit port. The present invention is a modification of a refrigerant cycle for BOG cooling, and LNG re-liquefaction in particular, that allows the use of a cost-efficient oil-injected screw compressor in the refrigerant system. The present invention is also able to accommodate the possibility of different flows or flow rates of the first refrigerant stream and the oil-containing refrigerant stream, such that there is reduced or no concern by the user of the process in relation to possible oil freezing and clogging of the heat exchanger caused by variation of the flow or flow rate of the oil-containing refrigerant stream. 1. A method of cooling a boil-off gas (BOG) stream from a liquefied gas tank comprising the steps ofheat exchanging the BOG stream with a first refrigerant in a heat exchanger, the heat exchanger having an entry port and a warmer exit port, and(a) passing the first refrigerant into the entry port of the heat exchanger and into a ...

AIR CONDITIONER

In an air conditioner that uses a refrigerant mixture containing at least 1,2-difluoroethylene, high efficiency is achieved. The motor rotation rate of a compressor () can be changed in accordance with an air conditioning load, and thus a high annual performance factor (APF) can be achieved. In addition, an electrolytic capacitor is not required on an output side of a rectifier circuit (), and thus an increase in the size and cost of the circuit is suppressed. 1. An air conditioner comprising:a compressor that compresses a refrigerant containing at least 1,2-difluoroethylene;a motor that drives the compressor; anda power conversion device that is connected between an alternating-current (AC) power source and the motor, that has a switching element, and that controls the switching element such that an output of the motor becomes a target value.2. The air conditioner according to claim 1 , whereinthe power conversion device includesa rectifier circuit that rectifies an AC voltage of the AC power source, anda capacitor that is connected in parallel to an output side of the rectifier circuit and smooths voltage variation caused by switching in the power conversion device.3. The air conditioner according to claim 1 , wherein the AC power source is a single-phase power source.4. The air conditioner according to claim 1 , wherein the AC power source is a three-phase power source.5. The air conditioner according to claim 1 , wherein the power conversion device is an indirect matrix converter includinga converter that receives an AC voltage of the AC power source and converts the AC voltage into a direct-current (DC) voltage, andan inverter that converts the DC voltage into an AC voltage and supplies the AC voltage to the motor.6. The air conditioner according to claim 1 , wherein the power conversion device is a matrix converter that directly converts an AC voltage of the AC power source into an AC voltage having a predetermined frequency and supplies the AC voltage having ...

Air-conditioning unit

An air-conditioning unit that is able to suppress ignition at an electric heater even when leakage of refrigerant occurs while a low-GWP refrigerant is used is provided. In an outdoor unit (20) including a casing (60), a compressor (21) provided inside the casing (60) and configured to compress refrigerant containing 1,2-difluoroethylene, and a drain pan heater (54) provided inside the casing (60), an electric power consumption of the drain pan heater (54) is lower than or equal to 300 W.

COMPRESSOR AND REFRIGERATION CYCLE DEVICE USING SAME

A compressor uses a refrigerant containing R1123 (1,1,2-trifluoroethylene) as a working fluid, and uses a polyol ester oil as a compressor lubricating oil. In addition, a fixed scroll and a revolving scroll each having a spiral lap rising from an end plate, and a compression chamber which is formed by meshing the fixed scroll and the revolving scroll, are provided. In addition, a discharge hole which is provided at a center position of the end plate of the fixed scroll, and is open to a discharge chamber, a bypass hole which is provided in the end plate of the fixed scroll, and communicates with the compression chamber and the discharge chamber at a timing different from a timing at which the compression chamber communicates with the discharge hole, and a check valve which is provided in the bypass hole, and allows a flow from the compression chamber side to the discharge chamber side. 1. A compressor which uses a refrigerant containing 1 ,1 ,2-trifluoroethylene as a working fluid , and uses a polyol ester oil as a compressor lubricating oil , comprising:a fixed scroll and a revolving scroll each having a spiral lap rising from an end plate;a compression chamber which is formed by meshing the fixed scroll and the revolving scroll;a discharge hole which is provided at a center position of the end plate of the fixed scroll, and is open to a discharge chamber;a bypass hole which is provided in the end plate of the fixed scroll, and communicates with the compression chamber and the discharge chamber at a timing different from a timing at which the compression chamber communicates with the discharge hole; anda check valve which is provided in the bypass hole, and allows a flow from a compression chamber side to a discharge chamber side.2. The compressor of claim 1 ,wherein the check valve is a reed valve provided on an end plate surface of the fixed scroll.3. The compressor of claim 1 ,wherein the discharge chamber always communicates with the compression chamber via the ...

HEAT CYCLE SYSTEM

To provide a heat cycle system with high durability, which employs a working fluid for heat cycle containing trifluoroethylene having a low global warming potential. 1. A heat cycle system , which has a circulation path in which a working fluid for heat cycle containing trifluoroethylene is circulated from a compressor via a condenser , an expansion valve and an evaporator to the compressor ,wherein a conductor wire provided in the circulation path is covered with a heat resistant material having a heat resistance of at least 300° C.2. The heat cycle system according to claim 1 , wherein the heat resistant material is a heat resistant material containing at least one material selected from the group consisting of mica claim 1 , asbestos claim 1 , alumina claim 1 , silica glass claim 1 , a polyimide resin claim 1 , a polyetherimide resin and a polyamide imide resin.3. The heat cycle system according to claim 1 , wherein the heat resistant material is a heat resistant material containing at least one material selected from the group consisting of mica claim 1 , asbestos claim 1 , alumina and silica glass.4. The heat cycle system according to claim 2 , wherein the heat resistant material is a heat resistant material comprising a material selected from the group consisting of mica claim 2 , asbestos claim 2 , alumina and silica glass claim 2 , and a material selected from the group consisting of a polyimide resin claim 2 , a polyetherimide resin and a polyamide imide resin claim 2 , in combination.5. The heat cycle system according to claim 1 , wherein the outer periphery of the conductor wire covered with the heat resistant material is further protected with a silicone resin.6. The heat cycle system according to claim 1 , wherein the conductor wire connects a driving means of the compressor and a power supply terminal capable of supplying an electric power from an external power source claim 1 , provided on the outer shell of the compressor.7. The heat cycle system ...

Rotary compressors with variable speed and volume control

Systems and methods are used to control operation of a rotary compressor of a refrigeration system to improve efficiency by varying the volume ratio and the speed of the compressor in response to current operating and load conditions. The volume of the axial and/or radial discharge ports of the compressor can be varied to provide a volume ratio corresponding to operating conditions. In addition, permanent magnet motors and/or control of rotor tip speed can be employed for further efficiency gains.

AIR CONDITIONER

The present invention relates to an air conditioner. A first invention according to the present embodiment is an air conditioner which has a refrigeration capacity of 16 kW to 28 kW, inclusive, and uses a mixed refrigerant R134a as a refrigerant, and in which a refrigerant pipe includes a ductile stainless steel pipe having 1% or less of a delta-ferrite matrix structure with respect to the grain size area thereof. 1. An air conditioner comprising:an outdoor unit comprising a compressor, an outdoor heat exchanger, and a main expansion device, wherein a refrigerant is circulated by a refrigerant pipe configured to connect the compressor, the outdoor heat exchanger, and the main expansion device to each other;an indoor unit comprising an indoor heat exchanger; anda connection pipe configured to connect the outdoor unit to the indoor unit,wherein the air conditioner has refrigeration capacity of 16 kW to 28 kW,a single refrigerant R134a is used as the refrigerant,the refrigerant pipe is made of a ductile stainless steel material having a delta ferrite matrix structure of 1% or less on the basis of a grain area, andthe refrigerant pipe comprises a suction pipe that guides suction of a refrigerant into the compressor and has an outer diameter of 22.20 mm.2. The air conditioner according to claim 1 , wherein the refrigerant pipe further comprises a discharge pipe that guides discharge of the refrigerant compressed in the compressor and has an outer diameter of 15.88 mm.3. The air conditioner according to claim 2 , wherein the suction pipe has an inner diameter of about 21.54 mm or less claim 2 , and the discharge pipe has an inner diameter of 15.38 mm or less.4. The air conditioner according to claim 1 , wherein the refrigerant pipe further comprises a discharge pipe that guides discharge of the refrigerant compressed in the compressor and has an outer diameter of 12.70 mm.5. The air conditioner according to claim 4 , wherein the suction pipe has an inner diameter of 21.54 ...

GAS HEAT PUMP SYSTEM

A gas heat pump system according to an embodiment of the present disclosure comprising: an outdoor unit comprising a compressor, an outdoor heat exchanger, and an expansion device; an indoor unit comprising an indoor heat exchanger; a refrigerant pipe configured to connect the outdoor unit and the indoor unit so as to allow a refrigerant to circulate through the outdoor unit and the indoor unit; an engine configured to combust mixed fuel in which fuel and air are mixed so as to provide power for driving the compressor; a coolant tank configured to store a coolant for cooling the engine; a coolant pump configured to allow the coolant stored in the coolant tank to forcibly flow; a radiator configured to emit, to an outside, heat which is transferred from the engine to the coolant; and a coolant pipe configured to connect the coolant tank, the coolant pump, and the radiator so as to allow the coolant to circulate therethrough. The gas heat pump system has a cooling capability between 71 kW and 85 kW, a mixed refrigerant containing R32 of 50% or more is used as the refrigerant, and the refrigerant pipe comprises a ductile stainless steel pipe having a delta ferrite matrix structure of 1% or less on a basis of a grain area. 1. A gas heat pump system comprising:an outdoor unit comprising a compressor, an outdoor heat exchanger, and an expansion device;an indoor unit comprising an indoor heat exchanger;a refrigerant pipe configured to connect the outdoor unit and the indoor unit so as to allow a refrigerant to circulate through the outdoor unit and the indoor unit;an engine configured to combust mixed fuel in which fuel and air are mixed so as to provide power for driving the compressor;a coolant tank configured to store a coolant for cooling the engine;a coolant pump configured to allow the coolant stored in the coolant tank to forcibly flow;a radiator configured to emit, to an outside, heat which is transferred from the engine to the coolant; anda coolant pipe configured ...

Oil Separation Barrel, Screw Compressor and Air Conditioning Unit

Disclosed is an oil separation barrel, which includes a barrel body and an oil separation and filtration structure provided in the barrel body, the barrel body provided with an oil separation cavity and an output port. An output gas flow is filtered by the oil separation and filtration structure, then enters the oil separation cavity, and finally is output from the output port. At least part of a barrel wall of the barrel body forming the oil separation cavity includes two or more layers of circumferential walls. The output gas flow flows in the oil separation cavity in such a manner that it changes the advance direction multiple times, which can make the flow field uniform and reduce noise and vibration; and the output gas flow impacts the circumferential wall surfaces in the oil separation barrel multiple times, which can further improve the efficiency of oil separation. 1. An oil separation barrel , comprising:a barrel body; andan oil separation and filtration structure provided in the barrel body, the barrel body being provided with an oil separation cavity and an output port, such that an output gas flow is filtered by the oil separation and filtration structure, enters the oil separation cavity, and is output from the output port;wherein at least part of a barrel wall of the barrel body forming the oil separation cavity comprises two or more layers of circumferential walls.2. The oil separation barrel according to claim 1 , wherein the barrel body comprises:an outer circumferential wall enclosing the oil separation cavity; andan inner circumferential wall, the inner circumferential wall separating the oil separation cavity into an inner oil separation cavity and an outer oil separation cavity.3. The oil separation barrel according to claim 2 , wherein the inner circumferential wall is provided with a connection port communicating the inner oil separation cavity with the outer oil separation cavity claim 2 , such that after being filtered by the oil separation ...

AIR CONDITIONING MACHINE

An air conditioning machine is provided by which a refrigerant collected into an outdoor heat exchanger can be suppressed from counter-flowing through a discharge hole of a compressor toward a side of an indoor heat exchanger in a refrigerant circuit after an end of a pump down operation. The air conditioning machine includes a refrigerant circuit, a refrigerant leakage sensing unit that senses leakage of the flammable refrigerant from the refrigerant circuit, and a pump down operation control unit that carries out the pump down operation for accumulating the flammable refrigerant in the outdoor heat exchanger in the refrigerant circuit when the refrigerant leakage sensing unit senses the leakage of the flammable refrigerant. The compressor includes a cylinder chamber, a compression member that is placed in the cylinder chamber and that compresses the flammable refrigerant, and a discharge hole through which the flammable refrigerant compressed in the cylinder chamber is discharged. At the end of the pump down operation, the pump down operation control unit controls the compressor so that the compression member stops at a position where the compression member overlaps at least a portion of the discharge hole when viewed in an axial direction of the cylinder chamber. 1. An air conditioning machine comprising:a refrigerant circuit in which a compressor, a four-way switching valve, an indoor heat exchanger, a pressure reducing mechanism, and an outdoor heat exchanger are circularly connected;a refrigerant leakage sensing unit that senses leakage of a flammable refrigerant from the refrigerant circuit; anda pump down operation control unit that carries out a pump down operation for accumulating the flammable refrigerant in the outdoor heat exchanger when the refrigerant leakage sensing unit senses the leakage of the flammable refrigerant,the compressor including:a cylinder chamber;a compression member that is placed in the cylinder chamber and that compresses the ...

COMPRESSOR AND REFRIGERATION CYCLE DEVICE USING SAME

A compressor uses a refrigerant containing R1123 (1,1,2-trifluoroethylene) as a working fluid, and uses a polyvinyl ether oil as a compressor lubricating oil. In addition, a fixed scroll and a revolving scroll each having a spiral lap rising from an end plate, and a compression chamber which is formed by meshing the fixed scroll and the revolving scroll, are provided. In addition, a discharge hole which is provided at a center position of the end plate of the fixed scroll, and is open to a discharge chamber, a bypass hole which is provided in the end plate of the fixed scroll, and communicates with the compression chamber and the discharge chamber at a timing different from a timing at which the compression chamber communicates with the discharge hole, and a check valve which is provided in the bypass hole, and allows a flow from the compression chamber side to the discharge chamber side. 1. A compressor which uses a refrigerant containing 1 ,1 ,2-trifluoroethylene as a working fluid , and uses a polyvinyl ether oil as a compressor lubricating oil , comprising:a fixed scroll and a revolving scroll each having a spiral lap rising from an end plate;a compression chamber which is formed by meshing the fixed scroll and the revolving scroll;a discharge hole which is provided at a center position of the end plate of the fixed scroll, and is open to a discharge chamber;a bypass hole which is provided in the end plate of the fixed scroll, and communicates with the compression chamber and the discharge chamber at a timing different from a timing at which the compression chamber communicates with the discharge hole; anda check valve which is provided in the bypass hole, and allows a flow from a compression chamber side to a discharge chamber side.2. The compressor of claim 1 ,wherein the check valve is a reed valve provided on an end plate surface of the fixed scroll.3. The compressor of claim 1 ,wherein the discharge chamber always communicates with the compression chamber ...

OIL RECOVERY FOR REFRIGERATION SYSTEM

A refrigerant system includes a compressor having a flow of compressor lubricant therein, the compressor compressing a flow of vapor refrigerant therethrough. An evaporator is operably connected to the compressor and includes an environment to be cooled via a thermal energy exchange with a liquid refrigerant in the evaporator. A vaporizer is receptive of a first flow of compressor lubricant and refrigerant mixture from the evaporator having a first concentration of lubricant. The vaporizer uses a flow of compressed refrigerant to separate refrigerant from the first flow. A lubricant sump is receptive of a second flow of compressor lubricant and refrigerant mixture from the vaporizer having a second concentration of lubricant greater than the first concentration. A heat exchanger is receptive of a third flow from the sump and uses evaporator suction gas to cool the third flow, thereby increasing its viscosity before urging the third flow to the compressor. 1. A refrigerant system comprising:a compressor having a flow of compressor lubricant therein, the compressor compressing a flow of vapor refrigerant therethrough;an evaporator operably connected to the compressor including an environment to be cooled via a thermal energy exchange with a liquid refrigerant in the evaporator; anda lubricant recovery system including:a vaporizer receptive of a first flow of compressor lubricant and refrigerant mixture from the evaporator having a first concentration of lubricant, the vaporizer using a flow of compressed refrigerant to boil off refrigerant from the compressor lubricant and refrigerant mixture; 'a heat exchanger receptive of a third flow of compressor lubricant and refrigerant mixture from the lubricant sump having a third concentration of lubricant, the heat exchanger using evaporator suction gas to cool the third flow of compressor lubricant and refrigerant mixture, thereby increasing its viscosity before urging the third flow to the compressor to lubricate the ...

SYSTEM FOR STORING AND COOLING MILK, MILKING SYSTEM, AND METHOD FOR COOLING MILK

A system for storing and cooling milk includes a cooling tank to store milk, a first sensor monitoring the filling level of milk in the cooling tank, and a cooling system cooling the milk in the cooling tank including a cooling device, a second sensor, and a control device. The cooling device includes an evaporator, a varying-capacity modulated scroll compressor connected with its suction side to the evaporator, a condenser connected to the high pressure side of the compressor, and an expansion valve interconnected between the condenser and the evaporator. The second sensor monitors a parameter indicative of the pressure at the suction side of the compressor. The control device is operatively connected to the first sensor to receive the monitored filling level, the second sensor to receive the monitored parameter, and the compressor to control the capacity thereof in response to the monitored filling level and the monitored parameter. 134-. (canceled)3511. A system () for storing and cooling milk comprising:{'b': 12', '13, 'a cooling tank () configured to store milk ();'}{'b': '15', 'a first sensor () monitoring a filling level (L) of milk in the cooling tank; and'} [{'b': '16', 'claim-text': [{'b': 19', '12, 'i': 'a', 'an evaporator () in heat exchange contact with at least a portion of the bottom surface () of the cooling tank,'}, {'b': 20', '20, 'i': 'a', 'a compressor () connected by a suction side () thereof to the evaporator, the compressor having a varying capacity that is controllable, the compressor being a capacity-modulated scroll compressor, the capacity being controllable by changing the modulation of the compressor,'}, {'b': 21', '20, 'i': 'b', 'a condenser () connected to the high pressure side () of the compressor, and'}, {'b': '22', 'an expansion valve () interconnected between the condenser and the evaporator,'}, 'the evaporator, the compressor, the condenser, and the expansion valve forming a closed circuit, in which a refrigerant is able to be ...

SPEED ESTIMATION APPARATUS FOR AC MOTOR, DRIVING APPARATUS FOR AC MOTOR, REFRIGERANT COMPRESSOR, AND REFRIGERATION CYCLE APPARATUS

A speed estimation apparatus for an AC motor includes a model deviation calculation unit, first and second angular velocity estimation units, and an adder. The deviation calculation unit calculates a model deviation based on a voltage, a current, and an estimated angular velocity of the motor. The first angular velocity estimation unit calculates a first estimated angular velocity as a low-frequency component including a DC component of a real angular velocity based on the model deviation. The second angular velocity estimation unit calculates a second estimated angular velocity as a high-frequency component of a real angular velocity based on a specific high-frequency component of the model deviation. The adder adds the first and second estimated angular velocities together. An addition value of the first and second estimated angular velocities is fed back as the estimated angular velocity to the deviation calculation unit. 1: A speed estimation apparatus for an AC motor , comprising:a model deviation calculation unit to calculate a model deviation based on a voltage, a current, and an estimated angular velocity of an AC motor;a first angular velocity estimation unit to calculate a first estimated angular velocity as a low-frequency component including a DC component of a real angular velocity based on the model deviation;a second angular velocity estimation unit to calculate a second estimated angular velocity as a high-frequency component of a real angular velocity based on a specific high-frequency component included in the model deviation; andan adder to add the first estimated angular velocity and the second estimated angular velocity together, whereinan addition value of the first estimated angular velocity and the second estimated angular velocity is fed back as the estimated angular velocity to the model deviation calculation unit.2: The speed estimation apparatus for an AC motor according to claim 1 , whereinthe second angular velocity estimation unit ...

Compressor unit, refrigeration circuit comprising the same and method of operating a compressor unit

A compressor unit (2) for use in a refrigeration circuit, comprises at least two compressors (8, 10); and a common variable frequency drive (6), configured to be connected to a three phase grid voltage supply (4); each compressor (8, 10) having an inlet port (12) configured to be in refrigerant communication, via a suction line, with an outlet of an evaporator; an outlet port (14) configured to be in refrigerant communication, via a pressure line, to an inlet of a condenser; a compressor motor (18), particularly an alternating current induction motor, with a three phase supply line (32-1, 32-2); a power modulation means (24) for controlling the power of the compressor (8, 10) according to its load needs; wherein each compressor (8, 10) is switchable, independently from the respective other compressor(s) (8, 10), to be connected, during start-up and acceleration of the respective compressor (8, 10), to the common variable frequency drive (6), and to be connected, during rated-speed operation of the respective compressor (8, 10), to a common three phase grid voltage supply (4).

SCREW COMPRESSOR WITH ECONOMIZER PORT

A screw compressor includes a screw compressor rotor (). The rotor () includes a helical flute () extending outwardly from a rotor axis (). A compressor housing () surrounds the rotor () and including a suction port () and a discharge port (). The housing () has an inner housing wall () abutting the rotor () and an outer housing wall () forming an exterior of the compressor. A housing pocket () is located between the outer housing wall () and the inner housing wall (). An economizer port () extends from the housing pocket () through the inner housing wall () to direct a flow of gaseous refrigerant into the compressor. 1. A screw compressor comprising:a screw compressor rotor, the rotor including a helical flute extending outwardly from a rotor axis;a compressor housing surrounding the rotor and including a suction port and a discharge port, the housing having an inner housing wall abutting the rotor and an outer housing wall forming an exterior of the compressor, a housing pocket disposed between the outer housing wall and the inner housing wall; andan economizer port extending from the housing pocket through the inner housing wall to direct a flow of gaseous refrigerant into the compressor.2. The screw compressor of claim 1 , wherein the economizer port is slot shaped and extends circumferentially parallel to the helical flute.3. The screw compressor of claim 1 , wherein a width of the economizer port is between 1 millimeter and 6 millimeters.4. The screw compressor of claim 1 , comprising at least two rotors disposed in the housing.5. The screw compressor of claim 4 , wherein the helical flutes of the at least two rotors intermesh.6. The screw compressor of claim 1 , comprising two or more economizer ports extending through the inner housing wall.7. The screw compressor of claim 1 , wherein the economizer port is formed by one of plasma cutting or water jet.8. A refrigerant system comprising:an evaporator; a screw compressor rotor, the rotor including a helical ...

HEAT TRANSFER COMPOSITIONS, METHODS AND SYSTEMS

The present invention includes refrigerant composition, including trifluoroiodomethane (CFI); 1,1,1,2-tetrafluoropropene (HFO-1234yf); difluoromethane (HFC-32); and pentafluoroethane (HFC-125), for use in a heat exchange system, including refrigeration applications and in particular aspects to the use of such compositions as a replacement of the refrigerant R-404A for heating and cooling applications and to retrofitting heat exchange systems, including systems designed for use with R-404A. 1. A refrigerant comprising at least about 97% by weight of the following four compounds with each compound being present in the following relative percentages:{'sub': '3', '32.8 to 42.8% by weight trifluoroiodomethane (CFI);'}48 to 58% by weight 1,1,1,2-tetrafluoropropene (HFO-1234yf);2 to 6% by weight difluoromethane (HFC-32); and1 to 3.2±0.2% by pentafluoroethane (HFC-125).2. The refrigerant of comprising at least about 98.5% by weight of the following four compounds in the relative amounts set forth below:{'sub': '3', '36 to 39% by weight trifluoroiodomethane (CFI);'}51 to 55% by weight 1,1,1,2-tetrafluoropropene (HFO-1234yf);2 to 6% by weight difluoromethane (HFC-32); and1 to 3.2±0.2% by weight carbon pentafluoroethane (HFC-125).3. The refrigerant of consisting essentially of the following four compounds in the relative amounts set forth below:{'sub': '3', '36 to 39% by weight trifluoroiodomethane (CFI);'}51 to 55% by weight 1,1,1,2-tetrafluoropropene (HFO-1234yf);2 to 6% by weight difluoromethane (HFC-32); and1 to 3.2±0.2% by weight pentafluoroethane (HFC-125).4. The refrigerant of consisting of the following four compounds in the relative amounts set forth below:{'sub': '3', '36 to 39% by weight trifluoroiodomethane (CFI);'}51 to 55% by weight 1,1,1,2-tetrafluoropropene (HFO-1234yf);2 to 6% by weight difluoromethane (HFC-32); and1 to 3.2±0.2% by weight pentafluoroethane (HFC-125).5. The refrigerant comprising at least about 97% by weight of the following four compounds in ...

MAGNETIC BEARING CENTRIFUGAL COMPRESSOR AND CONTROLLING METHOD THEREOF

A magnetic bearing centrifugal compressor includes a magnetic bearing spindle having a thrust disk, front and rear axial bearings, an impeller and at least one labyrinth seal. The front and the rear axial bearings are disposed individually to opposing sides of the thrust disk. First and second clearances exist axially between the rear and front axial bearings, respectively, and the thrust disk. The impeller connects a front end of the magnetic bearing spindle. The labyrinth seal pairs the magnetic bearing spindle into an oblique arrangement with respect to the axial direction, and each the labyrinth seal is spaced from the magnetic bearing spindle or the impeller by a labyrinth-seal clearance. By controlling the thrust disk axially, a clearance ratio of the first clearance to the second clearance can be varied to adjust the labyrinth-seal clearance. In addition, a magnetic bearing centrifugal compressor controlling method is also provided. 1. A magnetic bearing centrifugal compressor , comprising:a magnetic bearing spindle, movable in an axial direction, including an axial thrust-reducing ring;a thrust disk, sleeving fixedly the magnetic bearing spindle in a radial direction;a front axial bearing and a rear axial bearing, disposed individually to two opposing sides of the thrust disk, wherein a first clearance exists between the rear axial bearing and the thrust disk in the axial direction, wherein a second clearance exists between the front axial bearing and the thrust disk in the axial direction;an impeller, connected to a front end of the magnetic bearing spindle; andat least one labyrinth seal, pairing the magnetic bearing spindle into an oblique arrangement with respect to the axial direction, each of the at least one labyrinth seal being spaced from the magnetic bearing spindle or the impeller by a labyrinth-seal clearance;wherein, by controlling a position of the thrust disk in the axial direction, a clearance ratio of the first clearance to the second ...

CASCADING OIL DISTRIBUTION SYSTEM

A refrigeration system includes a plurality of compressors connected in series with each other. Each compressor has an oil sump located in a gravitational bottom of the compressor. A common supply line supplies refrigerant and oil to each of the plurality of compressors. The plurality of compressors includes a lead compressor and one or more non-lead compressors. The common supply line is configured to return more oil to the lead compressor than to the one or more non-lead compressors. Oil sump pressures for the plurality of compressors are maintained such that the lead compressor has the highest oil sump pressure, and the oil sump pressures of the non-lead compressors are successively lower with respect to its position downstream of the lead compressor. As a result, oil is distributed between adjacent compressors from the lead compressor, which is a most upstream compressor, sequentially downstream to the one or more non-lead compressors. 1. A refrigeration system comprising:a plurality of compressors connected in series with each other, each compressor having an oil sump located in a gravitational bottom of the compressor;a common supply line for supplying refrigerant and oil to each of the plurality of compressors;wherein the plurality of compressors includes a lead compressor and one or more non-lead compressors, and wherein the common supply line is configured to return more oil to the lead compressor than to the one or more non-lead compressors;wherein oil sump pressures for the plurality of compressors are maintained such that the lead compressor has the highest oil sump pressure, and the oil sump pressures of the non-lead compressors are successively lower with respect to its position downstream of the lead compressor, such that oil is distributed between adjacent compressors from the lead compressor, which is a most upstream compressor, sequentially downstream to the one or more non-lead compressors.2. The refrigeration system of claim 1 , wherein each of ...

COMPRESSOR STOP VALVE AND ASSOCIATED SYSTEM

A compressor system is provided that includes a contact cooled compressor and a coolant separator. The coolant separator is used to remove coolant fluid from a compressed flow stream produced by the contact cooled compressor during its operation. The coolant separator routes the removed coolant fluid back to the contact cooled compressor for further use. In some forms the coolant fluid is cooled prior to delivery back to the compressor. A stop valve can be provided in the coolant fluid return line to halt the flow of the fluid. A pressure sensitive member can be disposed to sense pressure of the coolant fluid that has been routed past the stop valve. Operation of the compressor can be changed as a result of the sensed pressure from the pressure sensitive member. Information from a temperature sensitive member can also be used to change operation of the compressor. 121.-. (canceled)22. A compressor assembly comprising:a compressor configured to raise a pressure of a compressible fluid, the compressor configured to employ oil within the compressor to lubricate at least one compressor elements;an oil reservoir coupled with the compressor via a conduit, the conduit configured to convey oil under pressure to the compressor from the oil reservoir;a controller configured to control operation of the compressor; anda temperature sensor in thermal communication with oil conveyed by the conduit to determine a temperature of the oil, the temperature determined by the temperature sensor being biased to provide an estimated temperature,wherein the controller is configured to cause operation of the compressor to halt when the controller determines that the estimated temperature exceeds an operational threshold temperature.23. The compressor assembly as recited in claim 22 , further comprising a valve coupled with the conduit between the oil reservoir and the compressor claim 22 , the valve operable to stop the flow of oil from the oil reservoir to the compressor.24. The compressor ...

SYSTEMS FOR A CHILLER ELECTRICAL ENCLOSURE

In an embodiment of the present disclosure, a heating, ventilation, air conditioning, and refrigeration (HVAC&R) system includes a variable speed drive (VSD) enclosure. The VSD enclosure includes a main drive line variable speed drive (VSD) configured to supply power to a motor, and an oil pump variable speed drive (VSD) configured to supply power to a pump. The pump is configured to supply oil to one or more moving parts of the HVAC&R system. Additionally or in the alternative to the oil pump VSD, the VSD enclosure includes a magnetic bearing controller and/or a magnetic bearing controller power supply. The magnetic bearing controller is configured to control magnetic bearings of the HVAC&R system. 1. A heating , ventilation , air conditioning , and refrigeration (HVAC&R) system , comprising:a refrigerant loop;a compressor disposed along the refrigerant loop, wherein the compressor is configured to circulate refrigerant through the refrigerant loop;a control panel; and a main drive line variable speed drive (VSD) configured to receive input from the control panel and to supply power to a motor of the compressor; and', 'an oil pump variable speed drive (VSD) configured to supply power to an oil pump, wherein the oil pump is configured to supply lubricant to the compressor., 'a variable speed drive (VSD) enclosure communicatively coupled to the control panel, wherein the VSD enclosure comprises2. The HVAC&R system of claim 1 , wherein the VSD enclosure comprises a variable geometry diffuser controller and/or a variable geometry diffuser power supply communicatively coupled to a variable geometry diffuser of the compressor.3. The HVAC&R system of claim 1 , wherein the VSD enclosure comprises an uninterruptible power supply configured to supply power to one or more components within the VSD enclosure.4. The HVAC&R system of claim 1 , wherein the VSD enclosure comprises a battery and a power supply claim 1 , wherein the battery and the power supply are each configured ...

Infinitely variable vi in screw compressors using proportional valve control

A variable-efficiency screw compressor for use in a closed-loop system configured to perform refrigeration is provided. The variable-efficiency screw compressor includes an inlet port to draw refrigerant into the variable-efficiency screw compressor, one or more rotating screws in fluid communication with the inlet port to compress the refrigerant, forming a compressed refrigerant, a discharge port in fluid communication with the rotating screws to receive the compressed refrigerant and discharge the refrigerant, wherein the discharge port includes an adjustable piston movable within the discharge port from a first position in which volume is higher to a second position in which volume is lower, the adjustable piston arranged and disposed to adjust volume of the discharge port in response to a change in demand.

SUCTION CONDUIT FLOW CONTROL FOR LUBRICANT MANAGEMENT

A system includes first and second compressors arranged in parallel, a condenser, expansion device, evaporator, and flow control device fluidly connected. The first compressor includes a first lubricant sump and the second compressor including a second lubricant sump. A lubricant transfer conduit fluidly connects the first lubricant sump and the second lubricant sump. The flow control device is disposed between the evaporator and the first and second compressors, and includes a fluid inlet and two fluid outlets. A first of the two fluid outlets is fluidly connected to the first compressor, a second of the two fluid outlets is fluidly connected to the second compressor. The second fluid outlet includes a nozzle disposed within a flow passage of the flow control device such that a space is maintained between an outer surface of the nozzle and an inner surface of the flow passage. 1. A system , comprising:first and second compressors, a condenser, an expansion device, an evaporator, and a flow control device fluidly connected;the first and second compressors being arranged in parallel;the first compressor including a first lubricant sump and the second compressor including a second lubricant sump;a lubricant transfer conduit fluidly connected to the first lubricant sump and the second lubricant sump; andthe flow control device being disposed between the evaporator and the first and second compressors, the flow control device including a fluid inlet and two fluid outlets, a first of the two fluid outlets being fluidly connected to the first compressor and a second of the two fluid outlets being fluidly connected to the second compressor, the second fluid outlet having a nozzle disposed within a flow passage of the flow control device such that a space is maintained between an outer surface of the nozzle and an inner surface of the flow passage.2. The system according to claim 1 , wherein the first compressor is a variable speed compressor and the second compressor is a ...

AIR CONDITIONER

An air conditioner comprises a compressor configured to have an inlet, through which a refrigerant is sucked in, the sucked refrigerant being compressed by the compressor, and an outlet, through which the compressed refrigerant is discharged, a four-way valve configured to switch flow paths in cooling and heating operations, the four-way valve having a valve body, a D port protruding from the valve body in a first direction to be connected to the outlet, and an S port protruding from the valve body in a second direction, which is opposite to the first direction, to be connected to the inlet, and a compressor pipe having a discharging pipe to connect the outlet and the D port and a sucking pipe to connect the inlet and the S port, one of the discharging pipe and the sucking pipe has two curved portions and the other has one curved portion. 1. An air conditioner comprising:a compressor configured to have an inlet, through which a refrigerant is sucked in, the sucked refrigerant being compressed by the compressor, and an outlet, through which the compressed refrigerant is discharged;a four-way valve configured to switch flow paths in a cooling operation and a heating operation, the four-way valve having a valve body, a D port protruding from the valve body in a first direction to be connected to the outlet, and an S port protruding from the valve body in a second direction, which is opposite of the first direction, to be connected to the inlet; anda compressor pipe having a discharging pipe to connect the outlet and the D port and a sucking pipe to connect the inlet and the S port,wherein one of the discharging pipe and the sucking pipe has two curved portions and an other one of the discharging pipe and the sucking pipe has one curved portion.2. The air conditioner of claim 1 , wherein a center axis of the D port and a center axis of the S port are included in a plane including a center axis of the inlet and a center axis of the outlet.3. The air conditioner of claim ...

HEAT PUMP APPARATUS, AIR CONDITIONER, AND WATER HEATER

A heat pump apparatus includes an outdoor heat exchanger, a fan configured to introduce outdoor air into the outdoor heat exchanger, and a control device configured to control a defrosting operation of the outdoor heat exchanger. The fan rotates at a first rotational speed within a first period, after the defrosting operation is finished and the fan starts rotating. The fan rotates at the first rotational speed within a second period, after a non-defrosting operation is finished and the fan starts rotating. The first period is shorter than the second period. 1. A heat pump apparatus comprising:an outdoor heat exchanger;a fan configured to introduce outdoor air into the outdoor heat exchanger; anda control device configured to control a defrosting operation of the outdoor heat exchanger,the fan rotating at a first rotational speed within a first period, after the defrosting operation is finished and the fan starts rotating,the fan rotating at the first rotational speed within a second period, after a non-defrosting operation is finished and the fan starts rotating,the first period being shorter than the second period.2. The heat pump apparatus according to claim 1 , wherein the fan stops when a rotational speed of the fan exceeds a predetermined upper limit value in the first period.4. An air conditioner comprising the heat pump apparatus according to .5. A water heater comprising the heat pump apparatus according to .6. An air conditioner comprising the heat pump apparatus according to .7. An air conditioner comprising the heat pump apparatus according to .8. A water heater comprising the heat pump apparatus according to .9. A water heater comprising the heat pump apparatus according to . The present invention relates to a heat pump apparatus, an air conditioner, and a water heater.Conventionally, an air conditioner including an indoor unit and an outdoor unit is known. When the air conditioner performs a heating operation in a state in which outdoor air temperature ...

MOTOR OF COMPRESSOR AND REFRIGERATION CYCLE APPARATUS

A compressor includes: a stator core including a plurality of teeth around which an aluminum winding wire is wound in a concentrated manner; a rotor core disposed on an inner diameter side of the stator core and including a plurality of magnet insertion holes; and a plurality of ferrite magnets inserted in the magnet insertion holes, in which when a width of a winding wire portion formed in each of the teeth is represented as A, a length in an axis direction of the stator core is represented as L, and the number of slots is represented as S, the stator core has a shape that satisfies a relation of 0.3 Подробнее

REFRIGERATION CYCLE APPARATUS

A refrigeration cycle apparatus includes a refrigerant and a refrigeration cycle circuit. The refrigeration cycle circuit includes a compressor, and causes the refrigerant to circulate therethrough. The refrigerant is HFO-based refrigerant alone or a mixed refrigerant. In the mixed refrigerant, a mixing ratio of HFO-based refrigerant is equal to or more than 10% by weight. The compressor includes a motor. The motor includes a portion formed from a resin component. The resin component is made of PET, PA, or the like. 1. A refrigeration cycle apparatus comprising:a refrigerant; anda refrigeration cycle circuit including a compressor, the refrigeration cycle circuit being configured to cause the refrigerant to circulate therethrough,whereinthe refrigerant is an HFO-based refrigerant alone or a mixed refrigerant in which a mixing ratio of an HFO-based refrigerant is equal to or more than 10% by weight,the compressor includes a motor,the motor includes a portion formed from a first resin component, andthe first resin component comprises at least one ofPET (polyethylene terephthalate),PA (polyamide),LCP (liquid crystal polymer),PBT (polyethylene terephthalate),phenol resin,melamine resin,PEEK (polyether ether ketone),PTFE (polytetrafluoroethylene),PAI (polyamideimide),PPS (polyphenylene sulfide), andPEN (polyethylene naphthalate).2. The refrigeration cycle apparatus according to claim 1 , whereina ratio of the first resin component to the refrigerant is equal to or more than 1.5% by weight.3. The refrigeration cycle apparatus according to claim 1 , further comprising:a refrigerating machine oil retained in the compressor; andan acid scavenger added to the refrigerating machine oil,whereina ratio of the acid scavenger to the refrigerant is equal to or less than 1.6% by weight.4. The refrigeration cycle apparatus according to claim 1 , whereinthe first resin component is used to form at least one portion of the motor selected from an insulator, an insulating sleeve, a ...

Chiller system and a method for generating coordination maps for energy efficient chilled water and condenser water temperature resets in chiller plant system

Embodiments include techniques for generating coordination maps for energy efficient chilled water and condenser water temperature resets in a chiller plant system. The embodiments include a controller configured to control and set thresholds for one or more parameters of the chiller system, wherein the chiller system includes one or more cooling tower, one or more pumps, and one or more water chillers, and one or more sensors operably coupled to the controller, wherein the one or more sensors are configured to measure values for one or more parameters. The embodiments also include a processor coupled to the controller, wherein the processor is configured to generate a coordination map based on the measured values and the thresholds for the one or more parameters, configure an operating setpoint for the chiller system based on the coordination map, and control the chiller system based at least in part on the configured operating setpoint.

Refrigeration system, and in-vehicle refrigeration system

A refrigeration system includes a primary evaporator that cooperates with a compressor, which compresses first refrigerant containing lubricant oil, to form a refrigeration cycle that circulates the first refrigerant. At the primary evaporator, the first refrigerant absorbs heat from second refrigerant and is thereby evaporated. The refrigeration system further includes a condenser, at which the second refrigerant releases heat to the first refrigerant and is thereby condensed. The refrigeration system also includes a secondary evaporator that cooperates with the condenser to form a refrigerant circulation circuit, in which the second refrigerant is circulated. At the secondary evaporator, the secondary evaporator absorbs heat from a primary cooling subject and is thereby evaporated. A refrigerant flow passage of the primary evaporator and a refrigerant flow passage of the condenser are independently formed, so that the refrigeration cycle and the refrigerant circulation circuit are independently formed.

Compressor cooling system

A system may include a compressor including a compression mechanism having first and second compression members defining a compression pocket disposed between the first and second compression members that decreases in volume during operation of the compression mechanism. A heat exchanger receives compressed working fluid from the compressor. An expansion device may be disposed downstream of the heat exchanger. A lubricant separator receives lubricant and working fluid discharged from the compression mechanism and provides separated lubricant to the compression mechanism. A lubricant-injection flow path may include a lubricant fitting and extends between the lubricant separator and the compression pocket such that separated lubricant is injected into the compression pocket through the lubricant fitting.

ELECTRIC COMPRESSOR CONTROLLER AND REFRIGERATION CYCLE DEVICE

A controller that controls an electric compressor, which is mounted to a vehicle and configures a two-stage compression refrigeration cycle device, has a deceleration section, an operation stop section, and a restart section. The deceleration section reduces a rotational speed of an electric motor by controlling an AC current which is output to the electric motor, when a two-stage compression mode, in which an intermediate-pressure refrigerant flows into the electric compressor from an intermediate-pressure port, is performed and an operation stop request to stop the electric compressor is made. The operation stop section stops the electric motor after the deceleration section reduces the rotational speed of the electric motor. The restart section restarts the electric compressor when the operation stop request is canceled after the operation stop section stops the electric compressor. 1. An electric compressor controller that controls an electric compressor mounted to a vehicle and configuring a two-stage compression refrigeration cycle device ,the electric compressor that has a compression mechanism, an electric motor, a suction port, a discharge port, and an intermediate-pressure port, the compression mechanism that is configured to compress a refrigerant and is operated by the electric motor, the electric compressor that is configured to draw a low-pressure refrigerant from the suction port, compress the low-pressure refrigerant in the compression mechanism to be a high-pressure refrigerant, and discharge the high-pressure refrigerant from the discharge port, the electric compressor that is configured to draw an intermediate-pressure refrigerant, which has an intermediate pressure between a pressure of the low-pressure refrigerant and a pressure of the high-pressure refrigerant, from the intermediate pressure port to join a refrigerant being compressed in the compression mechanism,the electric motor that is an AC motor using an AC current,the electric compressor ...

EFFICIENT VARIABLE CAPACITY CHILLED WATER PLANT DESIGN WITH REDUCED MECHANICAL COOLING AND THERMAL STORAGE

A system configuration for a chilled water plant is described in which mechanical cooling is reduced in favor of less energy intensive ambient dry or evaporative cooling. While the system sees the greatest performance improvement in dry and cool climates, considerable energy savings may be realized in a variety of climate zones. Less facility hardware is required for the same amount of total cooling capacity, reducing the overall cost of the plant. 1. A cooling system comprising:a first hydronic loop with a heat exchanger and cooling tower in series;a second hydronic loop with a chiller and cooling tower in series; anda chilled-water loop thermally connected to the first hydronic loop and the second hydronic loop, the chilled-water loop connected such that the chilled-water loop may bypass the first hydronic loop or the second hydronic loop.2. The cooling system of further comprising:a third hydronic loop with a heat exchanger and cooling tower in series; anda fourth hydronic loop with a heat exchanger and cooling tower in series, wherein the third and fourth hydronic loops are connected in parallel with the first hydronic loop.3. The cooling system of wherein the chilled-water loop is connected to the third hydronic loop such that the chilled-water loop may bypass the third hydronic loop.4. The cooling system of wherein the chilled-water loop is connected to each of the first and second hydronic loops through either a thermal connection or an evaporator.5. The cooling system of wherein the cooling system has a greater than 1:1 ratio of non-mechanical to mechanical cooling.6. The cooling system of further comprising a thermal energy storage system thermally connected to the chilled-water loop.7. The cooling system of claim 1 , wherein the cooling tower includes a fan associated with the cooling tower.8. The cooling system of claim 1 , wherein the cooling tower includes a pump associated with cooling tower.9. The cooling system of claim 1 , wherein the chilled-water ...