СПОСОБ СОЗДАНИЯ ЗАДАННОГО УРОВНЯ ВАКУУМА В СИСТЕМЕ ДОЕНИЯ И КОМПЬЮТЕРНЫЕ ПРОГРАММНЫЕ ПРОДУКТЫ

... 1. Способ создания заданного уровня вакуума в системе доения, причем указанная система доения содержит, по меньшей мере, два вакуумных насоса (P1, P2) с регулируемой скоростью, отличающийся тем, что: ! используют первый вакуумный насос (Р1) с регулируемой скоростью для создания заданного уровня вакуума в указанной системе доения, ! контролируют потребность в уровне вакуума в системе доения, и когда потребность в уровне вакуума системы доения является такой, что скорость указанного первого вакуумного насоса (Р1) с регулируемой скоростью достигает первого предельного значения скорости, то ! запускают второй вакуумный насос (Р2) с регулируемой скоростью и ! используют указанные первый и второй вакуумные насосы (P1, P2) с регулируемой скоростью параллельно для создания заданного уровня вакуума. ! 2. Способ по п.1, отличающийся тем, что при запуске второго вакуумного насоса (Р2) с регулируемой скоростью увеличивают скорость указанного второго вакуумного насоса (Р2) с регулируемой скоростью и ...

ХОЛОДИЛЬНЫЙ КОМПРЕССОР

Изобретение относится к холодильным компрессорам. В компрессорном блоке (12) с корпусом (22) компрессора расположен компрессорный элемент (24) для сжатия хладагента. В приводном блоке (14) с корпусом (26) привода расположен в корпусе (26) привода электродвигатель (32), а на корпусе (26) привода расположены присоединительные клеммы (42, 44, 46) для электродвигателя (32). Содержит электронный функциональный блок (92). Присоединительные клеммы (42, 44, 46) предусмотрены в расположенном на корпусе (26) привода корпусе (142), а в корпусе (142) предусмотрен электронный функциональный блок (92), выполняющий по меньшей мере одну компрессорную функцию и снабженный коммуникационным блоком (312) для обмена данными с внешними приборами (316). Техническим результатом является упрощение соединения холодильного компрессора с электронным функциональным блоком. 3 н. и 21 з.п. ф-лы, 4 ил.

Vorrichtung mit Kühlkreislauf

KUEHLSYSTEM

Spiralmaschine mit Gegendrehrichtungsschutz.

HYDRAULISCH-MECHANISCHE SCHUTZEINRICHTUNG FUER PUMPEN

Dry compressing vacuum pump has gas ballast device with valve that only opens when difference between atmospheric pressure and pressure on pump side of valve exceeds set value

Vacuum pump (1) has continuous or staged internal compression and gas ballast device (8) with blocking valve (11) and non-return valve (12) that prevents escape of gases to exterior from pump through gas ballast device. Gas ballast device also has valve (13) that only opens when difference between atmospheric pressure and pressure on pump side of valve exceeds set value.

Vakuumpumpe

Verdichter mit Bypass und Ventil mit Gegendrehrichtungsschutz

Verdichter mit Bypass und Ventil mit Gegendrehrichtungsschutz

Temperature control device e.g. for automobile climate-control system, has temperature sensing actuator for detecting temperature in compressor

A temperature control device in a valve used in a compressor (1) for controlling the pressure regime in the crank housing of the compressor, and a temperature sensing actuator for detecting the temperature in the compressor (1), in order to actuate the valve for increasing the pressure in the crank housing, if the temperature is higher than a predetermined temperature.

Refrigeration apparatus

Inside the hermetic shell of a scroll compressor, a normally closed solenoid valve seats against the back side of a stationary scroll plate to close a discharge opening through the plate. A coil circuit that actuates the valve has an electrical resistance that increases with temperature. The temperature dependent resistance allows the coil circuit to also function as a discharge temperature sensor. Should the discharge gas over-heat, the compressor motor and the valve are de-energized in response to the resistance exceeding a predetermined limit. The closed valve prevents backflow from rapidly reversing the rotational direction of the compressor, which can be extremely noisy and damaging to the compressor. Both the valve and the compressor motor are energized at the same time, regardless of the compressor's direction of rotation. Should the compressor motor be inadvertently wired to operate in reverse, the solenoid valve still opens to prevent destructively low pressure from developing ...

Scroll compressor with hot oil temperature responsive relief of back pressure

A scroll compressor includes a protection device having a valve 59 movable between a position blocking flow from the back pressure chamber 42 into the suction chamber 28 and a position allowing flow. The valve may be bimetallic and movable according to oil temperature in oil return line 50. Under adverse conditions e.g. reverse running or low refrigerant charge the oil temperature is high and the valve allows a flow of refrigerant, likely to be at elevated temperature, into the suction chamber which assists the oil in actuating the motor protection switch 60 to shut down the motor. By relieving the back pressure chamber the scroll members are allowed to separate, thereby reducing potential damage.

A vacuum pump surrounded by a ballistic blanket

Semiconductor process vacuum pumps are prone to build-up of potentially explosive deposits with resulting explosion risk. To protect personnel the pump is surrounded by a ballistic blanket to catch and stop explosion projectiles which removes the need for heavy gauge steel enclosures and complies with at least US National Institute for Justice level I or preferably between levels IIA and IV. The blanket may be located between the pump and an enclosure 2 comprising a metal frame 4 and openable, removable door-panels 6. The blanket is supported by the enclosure and may comprise four to six panels 8a to 8f and a vent 8g coaxial to a process chamber conduit 10 for discharge of explosion gas. The blanket panels may be connected by straps or springs to allow panel movement on explosion for further gas venting or there may be flaps, vents of pressure release valves. The enclosure may be extracted to remove leakage gas.

HERMETIC TYPE SCROLL COMPRESSOR

Multi-stage vacuum pump

A multi-stage vacuum pump, comprising at least one higher vacuum stage 30, 40, 50, at least one lower vacuum stage 60, 70, 80, 85, and an over-pressure device 120 operable to selectively couple said lower vacuum stage with said higher vacuum stage. This over-pressure device serves as a relief valve, to allow for reduction of pressure in the low vacuum stages thereby preventing improper pump operation. The over-pressure device may comprise a valve biased closed by a biasing force, the valve actuated by a pressure differential between said higher and lower vacuum stages. The stages may comprise a common rotor urged into position by an urging force, where his urging force exceeds said biasing force. The over pressure device may draw working fluid from a lower vacuum stage with the lowest vacuum, or one other than the highest vacuum lower vacuum stage. The over-pressure device may deliver working fluid to a highest vacuum stage of the lower vacuum stages, or to a stage other than the highest ...

Sliding-vane type rotary compressor

The compressor includes a rotor- drive motor that automatically rotates the rotor first in the reverse direction for a short period e.g. one or two seconds, on starting and thereafter in the forward direction. The compressor may be adapted for use in a refrigerator and the motor may be an electric one. This mode of operation reduces damage to the vanes owing the presence of liquid e.g. oil, in the refrigeration system.

Liquid ring pump control

A scroll compressor

Compressor, refrigerant compressing apparatus, and refrigerating apparatus

Rotary device

Pump monitoring system and method

PROCEDURE FOR THE MONITORING OF A COOLING SYSTEM

GAS PUMP PLANT ENTERPRISES BY A VANE PUMP WITH LIQUID POETRY AND THE USE OF LEAKAGE DETECTORS FOR HELIUM.

PROCEDURE FOR THE MONITORING OF A OEL-LUBRICATED VACCUM PUMP.

SPIRAL COMPRESSOR WITH PROTECTION AGAINST DIRECTION OF ROTATION REVERSAL

VALVE AND WITH THIS VALVE EQUIPPED DEVICE.

Compressor and refrigeration device using the same

Oil-cooled screw compressor system and method for modifying same

An oil-cooled screw compressor system is provided with: a first lubricating oil supply route which supplies lubricating oil to a screw section; and a second lubricating oil supply route which supplies lubricating oil to a bearing. The first lubricating oil supply route is provided with: a gas-liquid separator into which discharge gas from a screw compressor is introduced and which separates lubricating oil from the discharge gas; a first supply flow passage which is formed in a housing wall, is open to the outer surface of the housing wall, and is in communication with a screw chamber; and a first supply passage which is connected to the lubricating oil storage region of the gas-liquid separator and to the opening of the first supply flow passage. The second lubricating oil supply route is provided with: a lubricating oil storage tank; a second supply flow passage which is formed in the housing wall, is open to the outer surface of the housing wall, and is in communication with a bearing ...

Rotary compressor

This rotary compressor is equipped with: a vertically oriented compressor housing which is tightly sealed and stores a lubricant therein, and is provided with a coolant discharge part in the upper section thereof and a coolant intake part in the lower section thereof; a compression unit for compressing coolant taken in by the intake part and discharging the same from the discharge part, and provided in the lower section of the compressor housing; a motor for driving the compression unit by using a rotating shaft, and positioned in the upper section of the compressor housing; and an accumulator connected to the coolant intake part, and attached to the lateral section of the compressor housing. Furthermore, the interior of the accumulator and/or the interior of the compressor housing have the following provided therein: silicon dioxide which has pores having a diameter no larger than that of a water molecule in the crystalline structure thereof, or a compound containing silicon dioxide which ...

Combination valve for screw compressors

SCROLL-TYPE MACHINE

Compressor diagnostic system

LIQUID RING COMPRESSOR

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 ...

METHOD FOR REGULATING THE LIQUID INJECTION OF A COMPRESSOR, A LIQUID-INJECTED COMPRESSOR AND A LIQUID-INJECTED COMPRESSOR ELEMENT

Method for controlling the liquid injection of a compressor device (1), whereby this compressor device comprises at least one compressor element (2), whereby the compressor element (2) comprises a housing (3) that comprises a compression space (4) in which at least one rotor (7) is rotatably affixed by means of bearings (8), whereby liquid is injected into the compressor element (2), characterised in that the method comprises the step of providing two independent separated liquid supplies to the compressor element (2), whereby one liquid supply is injected into the compression space (4) and the other liquid supply is injected at the location of the bearings (8).

SCROLL COMPRESSOR WITH DISCHARGE VALVE OPENED BY CENTRIFUGAL FORCE

A scroll compressor, having a first scroll member and a second scroll member, includes a discharge valve device for closing an opening of a discharge port in which the discharge opening is disposed in at least one of the first and second scroll members. The discharge valve device is configured so that it is effected by a centrifugal force during operation of the scroll compressor. The centrifugal force normally maintains the discharge valve device in an open position with respect to the discharge opening. Thus, the discharge valve device is not actuated by a pressure chamber and the scroll members are not rotated in reverse when operation of the scroll compressor is stopped.

Reverse Phase and High Discharge Temperature Protection in a Scroll Compressor

VIBRATION MONITORING SYSTEM

A predictive vibration monitoring system for a machine includes amicrocontroller (20) and a machine to be monitored (10). The machine to be monitored (10) includes at least one rotative element. At least one sensor (12) is operatively connected to the machine (10). The at least one sensor (12) is operable to convert mechanical motion generated by the at least one rotative element into a corresponding electrical signal. The at least one sensor (12) inputs the corresponding electrical signal to the microcontroller (20). A communication means (22) is disposed between the microcontroller (20) and the monitored machine (10). The communication means (22) enables the microcontroller (20) to correlate a predetermined operation al state of the monitored machine (10) with a corresponding electrical signal generated by the at least one sensor (12). A memory means (38) communicates with the microcontroller (20) and stores a predetermined logic routine, at least one corresponding electrical signal an ...

SCROLL COMPRESSOR

Object: To provide a simple and cheap fitting structure by which a sealed terminal (51) is easily fitted within a fitting hole (53) and getting out thereof can be prevented. Construction: To insert a sealed terminal (51) into a fitting hole (53) and to pressingly insert a push nut (57) having a plurality of nails (57a) into the fitting hole (53), thereby to fit a sealed terminal (51) within a fitting hole (53).

POSITIVE DISPLACEMENT PUMP

A compressor assembly including a compression mechanism, a rotating cranksha ft operably coupled to the compression mechanism, the crankshaft provided with a longitudinally-extending oil conveyance passageway, the oil conveyance passageway in fluid communication with relatively moving interfacing bearing surfaces of the compression mechanism, and an oil pump assembly. The oil pump assembly includes an oil pump body having an interior surface and being rotatable relative to the crankshaft, a vane disposed within the pump body and rotating with the crankshaft, the vane having at least one end in sliding engagement with the interior surface of the oil pump body, and a por t plate disposed within the pump body and having rotatably opposite first and second position s. The vane is in sliding engagement with an adjacent surface of the port plate, and the po rt plate is provided with an inlet and an outlet. The pump body receives oil from a source of oil , the oil received in the pump body directed ...

STEPPED ANNULAR INTERMEDIATE PRESSURE CHAMBER FOR AXIAL COMPLIANCE IN A SCROLL COMPRESSOR

A scroll compressor having a suction pressure chamber into which fluid is received substantially at suction pressure and a discharge pressure chamber from which the fluid is discharged substantially at discharge pressure, including a first scroll member having a first involute wrap element projecting from a first substantially planar surface, a second scroll member having a second involute wrap element projecting from a second substantially planar surface, and third and fourth surfaces opposite the second substantially planar surface, the third and fourth surfaces respectively located in first and second planes which are spaced apart from each other and substantially parallel with the second substantially planar surface. The first and second scroll members are mutually engaged with the first involute wrap element projecting towards the second surface and the second involute wrap element projecting towards the first surface, the first surface positioned substantially parallel with the second ...

OLDHAM COUPLING FOR A SCROLL COMPRESSOR

A scroll compressor including a fixed scroll member having a substantially planar surface and an involute wrap element projecting therefrom, and provided with a first pair of offset, parallel elongate recesses, and an orbiting scroll member having a substantially planar surface and an involute wrap element projecting therefrom, and provided with a second pair of offset, parallel elongate recesses, the first and second pairs of recesse s aligned in substantially perpendicular directions, the fixed and orbiting scroll member s mutually engaged. An Oldham coupling is disposed in a first plane located between and substantially parallel with the substantially planar surfaces, the Oldham coupling having a first pair of axially extending tabs slidably engaged in the first pair of recesses and a second pair of axially extending tabs slidably engaged in the second pair of recesses, whereby relative rotation between the fixed and orbiting scroll members is prevented. The Oldham coupling has an outer ...

Rotierende Gasballastpumpe

Pompe à vide rotative à joint d'huile

Vorrichtung zum Schutz der Luftpumpe bei durch Saugwirkung mit Flüssigkeit füllbaren Kesseln

Mehrstufige Rotationsvacuumpumpe

Compresseur rotatif

Drehkolbenpumpe des Gebläsetyps

Rotationsvacuumpumpe mit Schraubenrotoren

DEVICE FOR DRIVING A COMPRESSOR.

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。 ...

Compressor assembly with liquid sensor

Vortex machine, electromagnetic mechanism thereof and electromagnetic air gap optimizing method of electromagnetic mechanism

Scroll compressor

Gap detection method and device between compressor rotor and stator

Rotary compressor

Vacuum proof device for vortex type compressor

Compressor with volutes with discharge valves

Improvements in gear pumps or compressors

HERMETIC COMPRESSOR INTENDS FOR THE GAS CIRCULATION

MACHINE DU TYPE A VOLUTES, SON DISPOSITIF D'ENTRAINEMENT, ET COMPRESSEUR DE FLUIDE DU TYPE A VOLUTES

ON DECRIT UNE MACHINE DU TYPE A VOLUTES SE PRETANT PARTICULIEREMENT A UNE UTILISATION EN TANT QUE COMPRESSEUR DE REFRIGERANT 30 ET COMPORTANT UN SYSTEME DE SUSPENSION POUR LA SPIRE NON-TOURNANTE 36, PERMETTANT A CETTE DERNIERE D'ETRE SOUMISE A UNE FORCE DE PRESSION DANS LE BUT D'AUGMENTER L'ETANCHEITE DES EXTREMITES. LA MACHINE PRESENTE EGALEMENT UN PROFIL MODIFIE DES EXTREMITES DES SPIRES ET DES PLAQUES D'EXTREMITE, AFIN D'EN ACCROITRE LES PERFORMANCES, AINSI QU'UN SYSTEME DE LUBRIFICATION AMELIORE POUR LE DISPOSITIF D'ENTRAINEMENT, ET UN DISPOSITIF A CHICANE FOURNISSANT UN ORIFICE D'ADMISSION PAR ASPIRATION DIRIGEE. LA MACHINE COMPORTE EGALEMENT UN COUPLAGE DE OLDHAM 38 UTILISANT UN NOUVEL ELEMENT ANNULAIRE QUI EST NON CIRCULAIRE ET PERMET D'AUGMENTER LA TAILLE DU PALIER DE BUTEE, OU DE DIMINUER LES DIMENSIONS DE LA MACHINE. ON DECRIT EGALEMENT UN PROCEDE DE FABRICATION D'UNE MACHINE DU TYPE A VOLUTES.

Paddle vacuum pump for automobile servo brake comprises hollow cylindrical body containing eccentrically rotating rotor in which paddle slides between retracted and extracted positions to define separation wall between two body compartments

Pompe à vide à palette comprenant un corps cylindrique creux (3), un rotor cylindrique (7) monté rotatif et de façon excentrée dans ledit corps (3), au moins une palette (11) montée coulissante dans une rainure radiale (13) du rotor, entre une position escamotée et une position extraite, de sorte qu'elle définit au cours de sa rotation solidaire avec le rotor (7) une paroi de séparation de longueur variable entre deux compartiments du corps (3). La palette (11) présente un orifice traversant (25) situé, dans la position extraite de la palette (11), entre la paroi externe du rotor (7) et la paroi interne (5) du corps (3), ledit orifice (25) étant muni d'un clapet anti-retour (27), de sorte que la paroi est sensiblement étanche lors d'une rotation dans un premier sens (F1), tandis qu'elle peut être traversée par un fluide lors d'une rotation en sens inverse (F2).

APPARATUS OF REFRIGERATION HAS COMPRESSING HAS VOLUTES

VALVE AND DEVICES USING SAID VALVE.

VACUUM PUMP

OVERHEATING-PREVENTING DEVICE FOR SCROLL COMPRESSOR BY SUPPLYING LIQUID REFRIGERANT

PURPOSE: A device for preventing overheating of a scroll compressor is provided to supply liquid refrigerant into a low pressure chamber by a pressure valve driven by deformation of a bimetal plate as temperature in a high pressure chamber rises. CONSTITUTION: A device for preventing overheating of a scroll compressor comprises a liquid refrigerant injection path(101), of which an opening part is communicated to a low pressure chamber and the other part is connected to the outside of a container(2). A pressure valve(102) is mounted in the middle of the liquid refrigerant injection path to be driven by a pressure for opening or closing the opening part of the liquid refrigerant injection path. A temperature sensing valve(103) has a valve plate formed of a bimetal and is provided to a high pressure chamber for sensing a temperature thereof to be driven at a set temperature. The temperature valve opens the pressure valve by a high pressure gas of the high pressure chamber to inject liquid ...

SCROLL COMPRESSOR WITH A PROPER VOLUMETRIC RATE FOR PREVENTING SUPER COMPRESSION IN A LOW LOAD CONDITION

PURPOSE: A scroll compressor is provided to improve efficiency even in a low load condition, and to prevent refrigerant from being super-compressed when the compressor is operated at a low speed. CONSTITUTION: A scroll compressor comprises laps for interlocking a plurality of scrolls each other. A compression chamber which moves with a rotating scroll is formed. A wrap volume ratio in the compression chamber is 1.8-2.2. The rotary angle of the scroll changes according to load. A bypass hole is formed to bypass some refrigerant before refrigerant compressed in the compression chamber flows into a discharge hole. COPYRIGHT KIPO 2013 [Reference numerals] (AA) Optimal performance range(20 to 150 degrees) ...

증기 주입 시스템을 가진 로터리 압축기

... 압축기는 크랭크샤프트, 제1 실린더 하우징 및 제2 실린더 하우징, 제1 회전자 및 제2 회전자, 분리판, 그리고 제1 밸브 및 제2 밸브를 포함할 수 있다. 상기 크랭크샤프트는 제1 편심부 및 제2 편심부를 포함하고 있다. 상기 실린더 하우징에는 원통형 리세스가 형성되어 있다. 상기 회전자는 각각의 원통형 리세스 내에 배치되어 있으며 크랭크샤프트의 각각의 편심부와 결합된다. 제1 회전자와 제1 원통형 리세스는 그들 사이에 제1 압축 챔버를 형성한다. 제2 회전자와 제2 원통형 리세스는 그들 사이에 제2 압축 챔버를 형성한다. 상기 분리판은 실린더 하우징 내에 배치될 수 있고 제1 압축 챔버 및 제2 압축 챔버와 연통되어 있는 제1 유체 개구 및 제2 유체 개구를 포함할 수 있다. 상기 밸브는 유체 유동이 유체 개구를 통과하는 것을 허용하는 제1 위치와 유체 유동이 유체 개구를 통과하는 것을 제한하는 제2 위치 사이에서 상기 분리판에 대해서 이동가능하게 될 수 있다.

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 ...

SCROLL-TYPE MACHINE

Vacuum pumping systems

The present invention relates to a vacuum pumping system 10 which comprises: a vacuum pumping mechanism 12 and a motor 14 for driving the vacuum pumping mechanism. Means 16 are provided for determining a cumulative load on the vacuum pumping system over time by monitoring a characteristic of the motor over that time. Means 18 are also provided for activating a maintenance activity on the system when the cumulative load exceeds a predetermined amount.

METHOD FOR PREDICTING A ROTATION FAULT IN THE ROTOR OF A VACUUM PUMP, AND ASSOCIATED PUMPING DEVICE

The invention pertains to a method for predicting a failure in the rotation of the rotor of a vacuum pump, comprising the following steps:sequences of events related to the change over time of the vacuum pump functional signals are recorded (101),a match is sought between at least one sequence of events and at least one pre-established association rule precursory pattern of a vacuum pump behavior modelwithin the recorded sequences of events, said pre-established association rule's precursory patterns involving a failure in the rotor rotation (102), anda time prediction window is deduced during which a failure in the rotor rotation will occur in a vacuum pump (103).The invention also pertains to a pumping device comprising:a vacuum pump (7) comprising at least one rotor and one pump body, saidrotor having the potential to be driven rotationally within said pump body by a motor of said pump (7),a functional signal sensor (9) of said pump (7), anda means of predicting (10) a time prediction ...

PREVENTION OF UNPOWERED REVERSE ROTATION IN COMPRESSORS

The shutdown of a compressor (10) installed in a refrigerant circuit (2) in air conditioning or refrigeration system is controlled so as to prevent unpowered reverse rotation of the compressor. Prior to terminating electric power to the compressor drive motor (24), the pressure within the system is relieved and substantially equalized across the compressor, thereby eliminating the possibility of unpowered reverse rotation of the compressor at shutdown. Pressure relief and equalization may be achieved by reducing the operating speed of the compressor to a low forward speed for a period of time prior to deenergizing the compressor drive motor. Pressure equalization may also be achieved by driving the compressor in reverse rotation prior to deenergizing the drive motor.

SCREW COMPRESSOR

Inside a casing (10) of a single-screw compressor, a slide valve (70) is disposed to a side of a screw rotor (40). A valve body (60) of the slide valve (70) is formed in a pillar shape, an opposing face (66), which is formed as an arc face, facing the slide valve (70). A front step portion (64) and a rear step portion (65) are formed on the opposing face (66) of the valve body (60). Dynamic pressure is created by refrigerant gas injected at the step portions (64, 65). Rotation of the valve body (60) is controlled by the dynamic pressure created at the step portions (64, 65) acting on the valve body (60), and a space between the valve body (60) and the screw rotor (40) is thereby maintained.

METHOD AND APPARATUS FOR ADJUSTING OPERATING PARAMETERS OF A VACUUM PUMP ARRANGEMENT

A method for adjusting operating parameters of a vacuum pump arrangement includes determining characteristics of a gas flowing through the vacuum pump arrangement; and setting operating parameters of the vacuum pump arrangement based on the determined characteristics of the first gas. A controller can be configured to perform the method for adjusting the operating parameters of the vacuum pump arrangement in accordance with the characteristics of the gas.

VALVE ASSEMBLY AND COMPRESSOR HAVING THE SAME

Disclosed are a valve assembly (100) and a compressor having the same. In the valve assembly (100) and the compressor having the same according to the present invention, the sliding valve (130) for controlling the flow direction of the liquid is made of a high-temperature proof material having good lubricity, thereby preventing the deformation or damange of the sliding valve (130) during the assembly process of the valve assembly (100) or due to the drying occurring when the compressor adapting the valve assembly (100) is dried, thus to increase the reliability of the valve assembly (100) as well as enhance the efficiency of the compressor adopting the same.

VACUUM PUMP

The invention concerns a vacuum pump designed in particular for motor vehicle braking power amplifiers, the pump being normally driven by an internal combustion engine of the vehicle, in a ( front ) rotational direction, the pump including a device for limiting damage resulting from rotations in the opposite direction.

ROTARY HELICAL SCREW-TYPE COMPRESSOR

Les deux moyeux (23, 29) du rotor d'un compresseur à vis situés côté pression sont supportés dans le carter (3) par un ensemble, à jeu axial libre, de roulements à billes à portée oblique (91, 93). Les roulements à billes reposent sur la face tournée vers le rotor (9, 11), ainsi que contre un épaulement interne (97) dudit carter (3) de rotor et contre une rondelle d'espacement (101) entourant l'un des moyeux (23, 29). La longueur de la rondelle d'espacement (101) excède la distance entre l'épaulement interne (97) et la face frontale (113) du carter tournée vers le rotor (9, 11). Cette distance excédentaire peut être choisie de façon à correspondre exactement à la largeur de l'ouverture du rotor entre la face frontale du rotor et la face frontale du carter. La rondelle d'espacement (101) peut en outre être configurée de façon à servir de bague de roulement en vue de la coopération avec un dispositif d'étanchéité isolant les moyeux.

PROCESS FOR OPERATING A DRY-COMPRESSION VACUUM PUMP

The invention relates to a process for operating a dry-compression vacuum pump (1) with at least one expansion chamber (8, 9) and at least one rotor (6, 7) driven by an electric motor (5), and to a vacuum pump suitable for this operating process; in order to reduce operational shutdowns for maintenance purposes without any risk to the pump, it is proposed that application-specific phenomena leading to deviations from the normal operating status or their effects be monitored and, after a predetermined deviation quantity has been attained at which the operation of the vacuum pump could be adversely affected in future, steps be taken to remove the causes thereof.

Compressor slugging protection device and method therefor

A slug detection and prevention apparatus 10 and method therefor, which includes a detector 1, high pass filter 2, low pass filter 3, half-wave rectifier 4, comparator 5, and relay 6. Detector 1, being an accelerometer, condenser microphone, or the like, is electrically connected to high pass filter 2. High pass filter 2 is electrically connected to a low pass filter 3 whose output is electrically connected to a half-wave rectifier 4. The output of half-wave rectifier 4 is electrically connected to a comparator 5 which is also electrically connected to a separate voltage source, the magnitude of which corresponds to the energy present in the pass band or a normally operating compressor. The output of comparator 5 is electrically connected to relay 6 which controls the operation of compressor 7. The vibration wave form of compressor 7 is monitored by detector 1 whose signal is filtered to produce an output between apparoximately 80 and 305 hertz. The signal in this pass band is compared ...

Vacuum pump with oil separator

The invention relates to a vacuum pump (1) with an oil separator (42) connected downstream of its outlet (33) and with a duct (45, 46) through which the oil separated in the oil separator (42) is returned to the vacuum pump (1); to feed back the oil in a simple manner, the oil feed duct (45, 46) opens into a duct (47) that supplies gas ballast to the pump (1).

Scroll compressor relief valve

In a rotary compressor, a relief valve for providing refrigerant at suction gas pressure to the discharg port when the rotary compressor is operated in the reverse rotation direction. The relief valve includes in the preferred embodiment a passage for providing a source of refrigerant at suction pressure, a pressure responsive relief valve, and a passage for providing refrigerant at suction pressure from the relief valve to the discharge port. When the compressor system is operated in the correct rotation, refrigerant at discharge pressure maintains the relief valve in the closed position, preventing flow from the discharge port to the suction pressure source. When the compressor system is operated in the reverse rotation however, the pressure in the discharge port is reduced to below that of the refrigerant in the suction pressure source, whereupon the releif valve opens permitting flow from the suction pressure source to the discharge port. This thereby provides a source of refrigerant ...

Vapor recovery pump

A vapor recovery pump for pumping flammable vapors is disclosed. The pump includes a pump unit that defines a pump chamber into which the vapor is first drawn and then exhausted from. A motor contained in a motor housing provides the motive force for energizing the pump unit. A single-piece inboard head seals the pump chamber and the motor housing and spaces the pump chamber away from the motor. Removable flame arrestor assemblies are attached to the inlet and outlet ports into which the vapor is, respectively, drawn into and exhausted from. A gland assembly integral with the motor housing provides a seal around the conductors that extend to the motor.

Combined pressure ratio and pressure differential relief valve

A pressure relief device has a chamber formed in a fixed scroll of a scroll-type machine, such as a scroll compressor. A piston is housed within the chamber releasably sealingly engaging a first passage which exposes the chamber to a discharge port formed in the fixed scroll. A second passage exposes the chamber to a suction plenum. A third passage exposes the chamber to pockets formed by the fixed and orbiting scrolls of the scroll compressor. In certain preferred embodiments, a pressure relief valve having a stem and a head is housed within a cavity formed in the piston. The head is biased by a spring into releasable sealing engagement with an aperture formed in the piston. The pressure relief valve passes fluid to the suction plenum whenever the difference between a discharge pressure and a suction pressure exceeds a predetermined value. The piston passes fluid to the suction plenum whenever the ratio of discharge pressure to suction pressure exceeds a predetermined value.

Drive device for electric compressor

A drive device of a compressor, including an inverter circuit formed of a plurality of switching elements, a drive unit that switches the switching elements, a determination unit that, when the compression mechanism restarts, determines whether a pressure difference of the compression mechanism is equal to or above a predetermined value, a restart unit that sets a number of times that the switching elements are switched per unit time during an initial predetermined period when the compression mechanism begins to restart and controls the drive unit, where the restart unit sets the number of times that the switching elements are switched per unit time to be lower when the determination unit determines that the pressure difference is equal to or above the threshold as compared to when the determination unit determines that the pressure difference is less than the threshold.

Scroll compressor having a rotation inhibitor

An object is to provide a scroll compressor capable of avoiding problems caused by abnormal wear of a retaining ring used to prevent a cylindrical ring from being detached. The scroll compressor includes a crank shaft having a crank pin (6C) at a shaft end, a drive bush (10) into which the crank pin (6C) is fitted, a cylindrical ring (11) that is rotatably fitted to an outer periphery of the drive bush (10) and whose axial movement is inhibited by a retaining ring (27) mounted on the tip of the crank pin (6C), a drive bearing that is fitted to an outer periphery of the cylindrical ring (11). An orbiting scroll fitted to an outer periphery of the drive bearing is driven in an orbiting manner through the rotation of the crank shaft. A rotation inhibitor that interferes with the retaining ring (27) to inhibit the rotation of the retaining ring (27) is provided on an end surface of the drive bush (10).

METHOD FOR OPERATING A COMPRESSOR

A method of operating a compressor includes obtaining a mechanical angle and an angular speed of a rotor, determining an amplitude of a fundamental harmonic of a periodic load torque exerted on the rotor based at least in part on the mechanical angle and a harmonic series representation of the periodic load torque, obtaining a speed error by subtracting the angular speed from a reference angular speed, determining a DC component of the periodic load torque based at least in part on a speed error and a closed loop feedback control algorithm, calculating an electromagnetic torque using the DC component of the periodic load torque and the amplitude of the fundamental harmonic of the periodic load torque, and operating the electric motor to generate the calculated electromagnetic torque on the rotor.

Dry compressing vacuum pump having a gas ballast device

Synchronous induction motor and manufacturing method and drive unit for the same, and hermetic electric compressor

Compressor with Oil Level Controlling Means

A compressor having oil level controlling means. The compressor comprises a casing having an oil storage portion at a bottom portion thereof, a compression unit installed inside the casing and configured to intake and compress working fluid, a driving unit mechanically connected to the compression unit and actuating the same, an oil level detecting means installed inside the casing and configured to detect an oil level of the oil storage portion, and a controller configured to control an operating speed of the compression unit based on the detected oil level of the oil storage portion, wherein the controller adjusts an acceleration of the operating speed of the compression unit to maintain the oil level of the oil storage portion within a desired range when the oil level exceeds the desired range while changing the operating speed.

Operation control device for vacuum pump and method for stopping operation thereof

To provide an operation control device for a vacuum pump and a method for stopping the operation of the vacuum pump that make it possible to effectively remove products, resulting from solidification and liquefaction of gas in a casing and possibly hindering the rotation of a pump rotor, so that the vacuum pump may be started normally. An operation control device (10) for a vacuum pump having a pump rotor (1) disposed in a casing (2) for free rotation includes a pump rotor control section (15) for controlling the rotation of the pump rotor (1). The pump rotor control section (15) has a function to, after a pump stop action has been taken, rotate the pump rotor (1) in forward and/or reverse directions according to a predetermined timing pattern and then stop the pump rotor (1).

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.

Scroll compressor

No-return security apparatus

METHOD FOR OPERATING A SCROLL VACUUM PUMP

Hermetic electric compressor

An object is to provide a hermetic electric compressor that can simplify the installation structure of an internal protector and improve the ease-of-assembly thereof. In a hermetic electric compressor having a compressor and an electric motor ( 10 ) built into a sealed housing ( 2 ), the electric motor ( 10 ) includes a stator ( 8 ) to which plastic insulating bobbins ( 30 ) having flanges ( 30 B, 30 C) on an inner and outer circumferences of a plurality of tooth parts of a stator core are fitted and around which a stator winding wire ( 8 A) is wound in concentrated winding around the plastic insulating bobbins ( 30 ), and an internal protector ( 29 ) for electric-motor protection is latched between the inner and outer circumferential flanges ( 30 B, 30 C) of the plastic insulating bobbins ( 30 ) by being urged against the stator winding wire ( 8 A).

Robust electric screw compressor blocked air line detection via motor current monitoring

Systems and methods for detecting a blocked air discharge line of an air compressor are described, which include monitoring motor current (IMTR) drawn by a compressor motor, and calculating a three-point moving average for a steady state current drawn by the compressor motor upon the motor reaching steady state (nominal) operating speed. After expiration of a predetermined time period T 1 that commences upon the compressor motor reaching steady state speed, a determination is made regarding whether a difference between a current drawn by the compressor motor and the three-point moving average has exceeded a predetermined current value I 2 and is consistent with a current profile indicative of a blocked air line. If a blocked air line is detected, a compressor shut-off command is generated and transmitted to the compressor motor to shut the compressor motor off prior to opening of a safety valve on the compressor.

Compressor protection and diagnostic system

A compressor diagnostic device is provided and includes at least one of a temperature sensor and a current sensor. The current sensor measures a first current flow through a motor of a refrigerant compressor. The temperature sensor is disposed within and sensing a temperature of a measurement region of an electrical conductor that is configured to close and open to allow and prevent current flow to the motor, respectively. The compressor diagnostic device also includes a controller in communication with the at least one of the current sensor and the temperature sensor. The controller is operable to control the electrical conductor based on a comparison of a second current flow through the motor and a maximum current.

System and method for compressor motor protection

A system includes a refrigerant compressor including an electric motor, a current sensor that measures current flow to the electric motor, a switching device configured to close and open to allow and prevent current flow to the electric motor, respectively, a maximum continuous current (MCC) device that includes a resistance corresponding to a maximum continuous current for the electric motor, and a motor protection module. The motor protection module communicates with the MCC device, the current sensor, and the switching device and determines a first MCC value for the electric motor as a function of the resistance of the MCC device. The motor protection module also selectively sets a predetermined MCC to the first MCC and controls the switching device based on a comparison of the current flow to the electric motor and the predetermined MCC.

Variable Speed Compressor Protection System And Method

A system and method for a compressor includes a compressor connected to a condenser, a discharge line temperature sensor that outputs a discharge line temperature signal corresponding to a discharge line temperature of refrigerant leaving the compressor, and a control module connected to the discharge line temperature sensor. The control module determines a saturated condenser temperature, calculates a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature, and monitors a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold. The control module increases a speed of the compressor or decreases an opening of an expansion valve associated with the compressor when the discharge superheat temperature is less than or equal to the predetermined threshold. 1. A system comprising:a compressor connected to a condenser;a discharge line temperature sensor that outputs a discharge line temperature signal corresponding to a discharge line temperature of refrigerant leaving the compressor;a control module connected to the discharge line temperature sensor, said control module determining a saturated condenser temperature, calculating a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature, monitoring a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold, and, when the discharge superheat temperature is less than or equal to the predetermined threshold, increasing a speed of the compressor or decreasing an opening of an expansion valve associated with the compressor.2. The system of wherein the predetermined threshold is thirty degrees Fahrenheit.3. The system of wherein the control module increases the speed of the compressor when the discharge superheat temperature is less than or equal to the predetermined threshold.4. The system of ...

COMPRESSOR PROTECTION MODULE

An electronic device is provided that may include a housing and an electronic component disposed within the housing. The housing may include a plug configured to engage a terminal assembly extending from a compressor shell and facilitate electrical communication between the plug and the terminal assembly. An exterior surface of the housing may include one or more receptacles extending therethrough in electrical communication with the electronic component. 1. An electronic device including an electronic component disposed within a housing , the housing having a plug configured to engage a terminal assembly extending from a compressor shell and facilitate electrical communication between the plug and the terminal assembly , an exterior surface of the housing including one or more receptacles extending therethrough in electrical communication with the electronic component.2. The electronic device of claim 1 , wherein the plug includes a plug body and a plurality of resiliently flexible tabs configured to snap into engagement with corresponding apertures in a fence of the terminal assembly.3. The electronic device of claim 2 , wherein the plug body includes a plurality of apertures configured to receive conductor pins of the terminal assembly.4. The electronic device of claim 1 , wherein the housing includes a base and a removable cap.5. The electronic device of claim 4 , wherein the cap includes a plurality of resiliently flexible tabs that snap into engagement with the base.6. The electronic device of claim 1 , wherein the one or more receptacles is in electrical communication with a display device disposed remotely from the housing.7. The electronic device of claim 1 , wherein the housing is adapted to selectively engage a first cap having an integral display device and a second cap that is in electrical communication with a remote display device.8. A set of components comprising:a base adapted to be mounted to a compressor and including a first engagement feature ...

AIR COMPRESSION DEVICE

An air compression device is provided with a rotary compressor, a discharge flow channel connected to a discharge portion of the compressor, a release flow channel disposed to be connectable to the discharge flow channel, and an operation control unit configured to perform a release operation of releasing a part or all of compressed air remaining in the discharge flow channel through the release flow channel when the operation control unit controls to stop the compressor. 1. An air compression device , comprising:a rotary compressor;a discharge flow channel connected to a discharge portion of the compressor;a release flow channel disposed to be connectable to the discharge flow channel; andan operation control unit configured to perform a release operation of releasing a part or all of compressed air remaining in the discharge flow channel through the release flow channel when the operation control unit controls to stop the compressor.2. The air compression device according to claim 1 , whereinwhen the release operation is performed, the operation control unit controls to start releasing the compressed air while driving the compressor, and controls to stop the compressor after a predetermined time elapses.3. The air compression device according to claim 1 , whereinwhen the release operation is performed, the operation control unit controls to start releasing the compressed air while driving the compressor, and controls to stop the compressor when a condition for finishing the release operation is satisfied.4. The air compression device according to claim 1 , further comprising:an opening/closing mechanism which connects or disconnects the discharge flow channel to or from the release flow channel, whereinthe operation control unit is configured to bring the opening/closing mechanism to a disconnected state when an ordinary operation of generating compressed air is performed, and to bring the opening/closing mechanism to a connected state before the compressor is ...

VANE PUMPS

A vane pump includes a liner defining a cammed inner surface, a rotor rotatably disposed within the liner that has a plurality of vane slots, and a plurality of vanes slidably disposed within vane slots of the rotor and configured to extend away from the rotor and contact the cammed inner surface of the liner. The plurality of vanes include at least one sentinel vane that is configured to allow detection of wear on the sentinel vane. 1. A vane pump , comprising:a liner defining a cammed inner surface;a rotor rotatably disposed within the liner and including a plurality of vane slots; anda plurality of vanes slidably disposed within vane slots of the rotor and configured to extend away from the rotor and contact the cammed inner surface of the liner, wherein the plurality of vanes include at least one sentinel vane that is configured to allow detection of wear on the sentinel vane.2. The vane pump of claim 1 , wherein the sentinel vane includes a base portion that is larger than the vane slot of the rotor such that after the sentinel vane wears a predetermined amount claim 1 , the base portion prevents the sentinel vane from extending further from the rotor such that a gap separates a sentinel vane tip and a portion of the cammed inner surface.3. The vane pump of claim 2 , wherein the portion of the cammed inner surface where the gap is created includes a constant radius section.4. The vane pump of claim 2 , wherein the at least one sentinel vane includes a plurality of symmetrically located sentinel vanes.5. The vane pump of claim 4 , wherein the plurality of symmetrically located sentinel vanes includes two sentinel vanes spaced 180 degrees circumferentially from each other.6. The vane pump of claim 4 , wherein the plurality of symmetrically located sentinel vanes are spaced circumferentially apart 360/N degrees claim 4 , wherein N is the total number of sentinel vanes.7. The vane pump of claim 2 , further comprising a vibration sensor operatively connected to the ...

HYDRAULIC PUMP AND RESPECTIVE MULTIFUNCTION VALVE

A hydraulic pump is described, comprising at least one inlet duct for a fluid, at least one outlet duct for the fluid and at least one pumping unit interposed between the inlet and outlet ducts. At least one multifunction valve is interposed between the inlet duct, upstream of the pumping unit, and the outlet duct, downstream of the pumping unit, which valve is configured to divert the flow of fluid from the inlet duct to the outlet duct without the fluid flowing into the pumping unit. The multifunction valve comprises a valve body that defines an inner bypass channel in which a shutter element is axially movable, an actuator member operatively associated with the shutter element and configured to move it from a closing position to an opening position of the bypass channel, and an elastic contrast element operatively associated with the shutter element and configured to keep it in the first closing position of the bypass channel when such shutter element is not actuated by the actuator member. The actuator member consists of a bias spring manufactured with a shape memory alloy, configured to move the shutter element from the first closing position to the second opening position of the bypass channel when a predefined temperature value is reached. 210262624242626. The hydraulic pump () according to claim 1 , characterized in that the shutter element () is mushroom-shaped claim 1 , with an inner portion (A) configured to be introduced into the bypass channel () and to occlude selectively said bypass channel () claim 1 , and an outer portion (B) having a larger cross section than the cross section of the inner portion (A).31030302612. The hydraulic pump () according to claim 2 , characterized in that the elastic contrast element () consists of a bias spring operating by traction claim 2 , preloaded with a predefined force claim 2 , said bias contrast spring () being configured to control the opening of the shutter element () when the pressure of the fluid circulating ...

Gas Compressor

To prevent generation of drain reliably without depending on a difference in ambient temperature where a compressor is installed. Provided is a gas compressor: having a compressor main body compressing a gas, a drive source driving the compressor main body, a controller controlling the rotation speed of the drive source according to the discharge pressure of the compressor main body, and a temperature detector detecting the temperature of a discharge gas of the compressor main body; and performing no-load operation with the rotation speed of the drive source as a lower limit rotation speed when the discharge pressure reaches an upper limit pressure higher than a set pressure. When detecting that the temperature detected by the temperature detector is equal to or lower than a predetermined temperature during the no-load operation, the controller causes the lower limit rotation speed of the drive source to a lower limit rotation speed at which the temperature of the discharge gas is higher than the predetermined temperature and which is higher than a lower limit rotation speed when the detected temperature is higher than the predetermined temperature.

METHOD AND APPARATUS IN CONNECTION WITH A SCREW COMPRESSOR

the screw compressor with a variable rotational speed of the screw compressor, the rotational speed of the screw compressor having a speed profile in which the rotational speed is changed stepwise such that between stepwise changes the rotational speed of the screw compressor is kept substantially constant for a time period, repeating the speed profile until the pressure of the pressure vessel reaches a set pressure value, determining pressure of the pressure vessel, power consumption of the screw compressor drive and mass flow rate during the pressurising when the rotational speed of the screw compressor is kept substantially constant, calculating energy efficiency of the screw compressor drive as a function of pressure of the pressure vessel and rotational speed of the screw compressor on the on the basis of the determined pressure of the pressure vessel and power consumption of the screw compressor drive. 1. A method of determining operation characteristics of a screw compressor drive comprising a screw compressor driven with a frequency converter , wherein the method comprisespressurising a pressure vessel of the screw compressor with a variable rotational speed of the screw compressor, the rotational speed of the screw compressor having a speed profile in which the rotational speed is changed stepwise such that between stepwise changes the rotational speed of the screw compressor is kept substantially constant for a time period,repeating the speed profile until the pressure of the pressure vessel reaches a set pressure value,determining pressure of the pressure vessel, power consumption of the screw compressor drive and mass flow rate during the pressurising when the rotational speed of the screw compressor is kept substantially constant,calculating energy efficiency of the screw compressor drive as a function of pressure of the pressure vessel and rotational speed of the screw compressor on the on the basis of the determined pressure of the pressure vessel and ...

SNAP-IN TEMPERATURE SENSOR FOR SCROLL COMPRESSOR

A temperature sensor on an outer surface of an upper shell at a location is associated with a discharge chamber. The temperature sensor includes electronics molded into an overmolded plastic and includes a spring member. The spring member snaps into a sensor housing connected to the outer surface. 1. A scroll compressor comprising:a housing including a cylindrical lower portion and an upper cover, said upper cover having an outer surface;a scroll compressor pump unit including a first scroll member having a base and a generally spiral wrap extending from its base, and a second scroll member having a base and a generally spiral wrap extending from its base, said wraps of said first and second scroll members interfitting to define a compression chamber, and said first scroll member having a discharge port;an electric motor for driving a drive shaft to rotate and, in turn, cause said second scroll member to orbit relative to said first said scroll member to decrease a volume of said compression chambers such that a refrigerant is entrapped and is driven to communicate with said discharge port;a discharge chamber defined inwardly of said upper cover and communicating with said discharge port; anda temperature sensor connected to said outer surface at a location associated with said discharge chamber, said temperature sensor including a spring member, said spring member snapping into a sensor housing connected to said outer surface.2. The scroll compressor as set forth in claim 1 , wherein said sensor housing and said spring member are metallic.3. The scroll compressor as set forth in claim 1 , wherein said sensor housing has a front opening for receipt of said sensor and such that said sensor can be inserted and removed from said front opening.4. The scroll compressor as set forth in claim 1 , wherein said sensor includes an electronic component in contact with said outer surface.5. The scroll compressor as set forth in claim 4 , wherein said electronic component is a ...

Variable Speed Compressor Protection System And Method

A system and method for a compressor includes a compressor connected to a condenser, a discharge line temperature sensor that outputs a discharge line temperature signal corresponding to a discharge line temperature of refrigerant leaving the compressor, and a control module connected to the discharge line temperature sensor. The control module determines a saturated condenser temperature, calculates a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature, and monitors a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold. The control module increases a speed of the compressor when the discharge superheat temperature is less than or equal to the predetermined threshold. 1. A method comprising:determining, with a control module, a saturated condenser temperature of a condenser connected to a compressor;receiving, with the control module, a discharge line temperature signal that corresponds to a discharge line temperature of refrigerant leaving the compressor;calculating, with the control module, a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature;monitoring, with the control module, a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold; andincreasing a speed of the compressor, with the control module, when the discharge superheat temperature is less than or equal to the predetermined threshold.2. The method of wherein the predetermined threshold is thirty degrees Fahrenheit.3. The method of wherein the control module increases the speed of the compressor when the discharge superheat temperature is less than or equal to the predetermined threshold.4. The method of further comprising decreasing claim 1 , with the control module claim 1 , an opening of an expansion valve associated with the compressor when the discharge ...

OIL-FLOODED SCREW COMPRESSOR SYSTEM AND METHOD FOR MODIFYING THE SAME

An oil-flooded screw compressor system includes: a first lubricating oil supply system for supplying lubricating oil to screw parts; and a second lubricating oil supply system for supplying the lubricating oil to a bearing. The first lubricating oil supply system includes: a gas-liquid separator; a first supply flow passage; and a first supply path. The second lubricating oil supply system includes: a lubricating oil reservoir; a second supply flow passage; a second supply path; a first discharge flow passage; and a discharge path. It is possible to suppress dissolution of a gas to be compressed in lubricating oil and to suppress damage to a bearing due to deterioration of the performance of the lubricating oil, even in a case where the gas to be compressed is compatible with the lubricating oil. 1. An oil-flooded screw compressor system for compressing a gas to be compressed which is a compatible gas with lubricating oil , comprising: a male screw rotor and a female screw rotor each having a screw part and shaft portions formed on both ends of the screw part;', 'a housing having a screw chamber accommodating the screw parts inside and a bearing chamber accommodating the shaft portions inside; and', 'a bearing disposed in the bearing chamber, for rotatably supporting the shaft portions;, 'a screw compressor which includesa first lubricating oil supply system for supplying lubricating oil to the screw parts; anda second lubricating oil supply system for supplying the lubricating oil to the bearing, a gas-liquid separator configured to introduce discharge gas of the screw compressor therein and to separate the lubricating oil from the discharge gas;', 'a first supply flow passage formed through a housing wall which constitutes the housing, the first supply flow passage having an opening on an outer surface of the housing wall and being in communication with the screw chamber; and', 'a first supply path connected to a lubricating-oil storage region of the gas-liquid ...

Systems and methods for assessing the health of a first apparatus by monitoring a dependent second apparatus

Systems and methods for assessing the health of a first apparatus by monitoring a second apparatus are described herein. A method for monitoring a health of a first apparatus may comprise receiving a performance parameter from a second apparatus, wherein performance of the second apparatus is dependent upon the health of the first apparatus, assessing the performance parameter, and determining the health of the first apparatus. In various embodiments, the performance parameter may comprise at least one of a speed value of the second apparatus, a position value of the second apparatus, a temperature value of the second apparatus, or a time value of the second apparatus.

VACUUM PUMP WITH COOLING APPARATUS

The present invention relates to a technology of efficiently cooling a vacuum pump that produces a vacuum in a process chamber of a semiconductor manufacturing facility. The present invention provides a new type of vaccum pump cooling method that keeps the internal temperature of a vacuum pump at a predetermined level by circulating oil through rotors of the vacuum pump, such that it is possible to prevent a rapid increase in the temperature of the vacuum pump and smoothly lubricate bearings at the early stage of operation, whereby it is possible to ensure stability when performing processes and operating the pump and economically maintain the facility. 1. A vacuum pump with a cooling apparatus , comprising:{'b': 12', '10', '11, 'a pump housing () having an inlet () for receiving gas and an outlet () for discharging gas;'}{'b': 13', '13', '12, 'i': a', 'b, 'a pair of rotors (, ) supported at both ends in the pump housing () and generating vacuum pressure by rotating in mesh with each other;'}{'b': 14', '13', '13', '13, 'i': a', 'a', 'b, 'a motor () connected to a shaft of the rotor () to drive the rotors (, ); and'}{'b': 15', '13', '13, 'i': a', 'b, 'gears () for cooperation between the rotors (, );'}{'b': 31', '12, 'a first temperature sensor () disposed at a gas inlet side of the pump housing () to detect temperature of gas;'}{'b': 32', '18, 'a second temperature sensor () disposed in a main oil line of the oil supply unit () to detect temperature of oil; and'}{'b': 33', '31', '32, 'a micro processor () variably controlling temperature of oil on the basis of temperature values input from the first temperature sensor () and the second temperature sensor (),'}{'b': 16', '13', '13', '17', '16', '17', '18', '13', '13', '16, 'i': a', 'b', 'a', 'b, 'wherein holes () are formed in parallel along axial lines of the rotors (, ), oil supply pipes () are disposed in the holes (), oil is supplied into the oil supply pipes () from an oil supply unit (), and the oil cools the ...

Compressor Unit and Method for Operating a Compressor Unit

A compressor unit including a screw compressor having a compressor housing that has a screw rotor chamber arranged in the compressor housing, two screw rotors that are arranged in the screw rotor chamber and are mounted on the compressor housing to be rotatable about a respective screw rotor axis, and at least one control slider, which is arranged in a slider channel of the compressor housing, is adjacent to both screw rotors and is movable in a direction of displacement parallel to the screw rotor axes and takes a form such that it affects the final volume and/or the initial volume, wherein there is provided on the screw compressor a compressor operational control unit that takes a form such that it performs a compressor operating function that assists at least one operation of the compressor unit. 1. A compressor unit , including a screw compressor having a compressor housing that has a screw rotor chamber arranged in the compressor housing , at least one screw rotor that is arranged in the screw rotor chamber , is mounted on the compressor housing to be rotatable about a screw rotor axis and receives gaseous medium having an initial volume that is supplied by way of a low-pressure chamber arranged in the compressor housing and discharges it , compressed to a final volume , in the region of a high-pressure chamber arranged in the compressor housing , and at least one control slider , which is arranged in a slider channel of the compressor housing , is adjacent to the screw rotor and is movable in a direction of displacement parallel to the screw rotor axis and takes a form such that it affects the final volume and/or the initial volume ,there is provided on the screw compressor a compressor operational control unit that takes a form such that it performs a compressor operating function that assists at least one operation of the compressor unit.2. A compressor unit according to claim 1 , wherein the at least one compressor operating function is a parameter ...

Refrigerant Compressor Unit

A refrigerant compressor unit, including a compressor housing and at least one compressor element that is arranged in the compressor housing, is movable by bearing and drive parts, and operates in at least one compressor chamber, at least one lubricant supply point arranged in the compressor housing for at least one of the bearing and drive parts and/or compressor element, and a lubricant supply line to the at least one lubricant supply point, wherein the lubricant supply line has a lubricant storage chamber through which lubricant flows and in which a lubricant presence sensor is arranged for detecting the presence of lubricant in the lubricant storage chamber. 1. A refrigerant compressor unit , including a compressor housing and at least one compressor element that is arranged in the compressor housing , is movable by bearing and drive parts , and operates in at least one compressor chamber , at least one lubricant supply point arranged in the compressor housing for at least one of the bearing and drive parts and/or compressor element , and a lubricant supply line to the at least one lubricant supply point ,the lubricant supply line has a lubricant storage chamber through which lubricant flows and in which a lubricant presence sensor is arranged for detecting lubricant in the lubricant storage chamber.2. A refrigerant compressor unit according to claim 1 , wherein the lubricant presence sensor is an optical sensor.3. A refrigerant compressor unit according to claim 1 , wherein the optical lubricant presence sensor is arranged with a sensor surface that detects the presence of lubricant adjacent to the lubricant storage chamber.4. A refrigerant compressor unit according to claim 2 , wherein the lubricant storage chamber forms claim 2 , in relation to the rest of the flow sections of the lubricant supply line claim 2 , an unthrottled section claim 2 , and for example takes a form having a widened cross section by comparison with the rest of the flow sections of the ...

METHOD FOR ROTARY POSITIVE DISPLACEMENT PUMP PROTECTION

Techniques are provided for protecting a rotary positive displacement pump. The techniques include apparatus featuring a signal processor configured to receive signaling containing information about power, torque, speed, viscosity and specific gravity related to the operation of a pump; and determine whether to enter an enhanced pump protection mode for the rotary positive displacement pump based at least partly on a relationship between an actual corrected tune ratio and a tuned ratio set point (Tune Ratio SP). The signal processor may determine if the actual corrected tune ratio is less than or equal to the actual corrected tune ratio set point (Tune Ratio SP), and if so, then to enter the enhanced pump protection mode, else to continue to use a basic pump protection mode, and may also determine the actual corrected tune ratio based at least partly on a ratio of an actual corrected power (PAcorr) divided by a tuned corrected power (PTcorr) at a specific operating speed 1. Apparatus comprising:a signal processor configured toreceive signaling containing information about power, torque and speed related to the operation of a rotary positive displacement pump; anddetermine whether to enter an enhanced pump protection mode for the rotary positive displacement pump based at least partly on a relationship between an actual corrected tune ratio and a tuned ratio set point (Tune Ratio SP).2. Apparatus according to claim 1 , wherein the signal processor is configured to determine if the actual corrected tune ratio is less than or equal to the actual corrected tune ratio set point (Tune Ratio SP) claim 1 , and if so claim 1 , then to enter the enhanced pump protection mode claim 1 , else to continue to use a basic pump protection mode.3. Apparatus according to claim 1 , wherein the signal processor is configured to determine the actual corrected tune ratio based at least partly on a ratio of an actual corrected power (PAcorr) divided by a tuned corrected power (PTcorr) at a ...

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 ...

Method of determining pump flow in twin screw positive displacement pumps

Techniques are provided for tuning a twin screw positive displacement pump having a signal processor with a signal processor to receive signaling containing information about actual pump performance data for actual rated conditions captured during a tuning function related to the operation of a twin screw positive displacement pump; and determine corrected pump performance data to operate the rotary positive displacement pump by compensating pump performance data being used for operating the twin screw positive displacement pump based at least partly on the actual pump performance data for the actual rated conditions captured during the tuning function. The corrected pump performance data includes corrected published pump performance data having a corrected published rated power and slip factor, and the actual pump performance data contains information about actual power, specific gravity and viscosity related to the operation of the twin screw positive displacement pump and received from a pump controller or controlling device, including a variable frequency drive. 1. Apparatus comprising:a signal processor configured toreceive signaling containing information about actual pump performance data for actual rated conditions captured during a tuning function related to the operation of a twin screw positive displacement pump; anddetermine corrected pump performance data to operate the twin screw positive displacement pump by compensating pump performance data being used for operating the twin screw positive displacement pump based at least partly on the actual pump performance data for the actual rated conditions captured during the tuning function.2. Apparatus according to claim 1 , wherein the corrected pump performance data include corrected published pump performance data having a corrected published rated power a rated slip factor compensated for the actual rated conditions.3. Apparatus according to claim 1 , wherein the actual pump performance data includes ...

COMPRESSOR UNIT FOR REFRIGERATING MACHINE FOR DOMESTIC OR COMMERCIAL USE AND REFRIGERATING MACHINE FOR DOMESTIC OR COMMERCIAL USE WHICH COMPRISES IT

A compressor unit () of a refrigerating machine () for domestic or commercial use has a rotary compressor () which has a BLDC or BLAC motor (), connected to a compression element () for actuating it, and a control device () connected to the motor (), for driving it at a variable speed. The compressor () further has a a housing () which encloses the motor () and the compression element () and which has a side wall () inside of which the stator () of the motor () is fixed. The compressor unit () also comprises an operating shell () covering the housing () and in thermal communication with the side wall (). The operating shell () dissipates heat transmitted to it by the housing () and contrasts or absorbs or dissipate sound waves having a frequency of between 4 kHz and 16 kHz. 2102222191721181720. The compressor unit () according to claim 1 , which comprises a base () claim 1 , for resting on a supporting surface claim 1 , said base () being fixed to a lower wall () of said housing (); said operating shell () being configured in such a way as to cover an upper wall () of said housing () and said side wall ().310211817. The compressor unit () according to claim 2 , wherein said operating shell () is in thermal contact with the upper wall () of said housing ().4102324201817. The compressor unit () according to claim 2 , comprising an operating layer () made of sound absorbent foam-type material having a first face () in thermal contact with said side wall () and/or with said upper wall () of said housing ().5102324201817. The compressor unit () according to claim 3 , comprising an operating layer () made of sound absorbent foam-type material having a first face () in thermal contact with said side wall () and/or with said upper wall () of said housing ().610. The compressor unit () according to claim 4 , wherein said sound absorbent foam-type material comprises a melamine resin foam.710. The compressor unit () according to claim 5 , wherein said sound absorbent foam-type ...

Screw Compressor for a Utility Vehicle

A screw compressor system for a utility vehicle includes at least one screw compressor and at least one control and/or regulation unit for controlling and regulating the screw compressor. The control and/or regulation unit is designed such that the screw compressor is prevented, for a determined period of time, from re-starting after being stopped. 18-. (canceled)9. A screw compressor system for a utility vehicle , comprising:at least one screw compressor; andan open-loop and/or closed-loop control unit for open-loop and/or closed-loop drive control of the screw compressor, whereinthe open-loop and/or closed-loop control unit is configured such that the screw compressor is, after a stoppage, prevented from restarting for a predetermined time period.10. The screw compressor system as claimed in claim 9 , whereinthe open-loop and/or closed-loop control unit is a constituent part of the screw compressor.11. The screw compressor system as claimed in claim 9 , whereinthe open-loop and/or closed-loop control unit is a constituent part of a drive of an air treatment system of the utility vehicle.12. The screw compressor system as claimed in claim 9 , whereinthe open-loop and/or closed-loop control unit is a constituent part of an engine or vehicle controller of the utility vehicle.13. The screw compressor system as claimed in claim 9 , whereinthe open-loop and/or closed-loop control unit is in a form of a separate open-loop and/or closed-loop control unit.14. The screw compressor system as claimed in claim 9 , whereinthe time period amounts to at least approximately 10 seconds.15. The screw compressor system as claimed in claim 9 , whereinthe time period amounts to at least approximately 15 seconds.16. The screw compressor system as claimed in claim 9 , whereinthe screw compressor has at least one relief valve.17. The screw compressor system as claimed in claim 16 , whereinthe relief valve is dimensioned such that an interior of the screw compressor can, within the time ...

Device

A vacuum pump includes a pump rotor, a housing configured to house the pump rotor, and a monitoring device attached to the housing and configured to detect vibration of the housing. The housing includes first channels for causing a coolant to flow to a portion opposed to the monitoring device.

SCROLL COMPRESSOR

A scroll compressor is provided that may include an orbiting scroll having an orbiting wrap, and which performs an orbiting motion; and a fixed scroll having a fixed wrap to form a compression chamber including a suction chamber, an intermediate pressure chamber, and a discharge chamber, by being engaged with the orbiting wrap. In a state in which the orbiting scroll and the fixed scroll are concentric with each other, when a distance between the orbiting wrap and the fixed wrap is defined as an orbiting radius, there exists an offset section having an interval larger than the orbiting radius, between a side surface of the orbiting wrap and a side surface of the fixed wrap which faces the orbiting wrap. With such a configuration, even if the fixed scroll or the orbiting scroll is transformed due to thermal expansion, interference between the fixed wrap and the orbiting wrap at a portion having a large transformation amount may be prevented. This may prevent a frictional loss or abrasion between the fixed wrap and the orbiting wrap. Further, this may restrict or minimize a gap between the fixed wrap and the orbiting wrap at an opposite side to the suction chamber, resulting in enhanced compression efficiency. 1. A compressor , comprising:a casing;a drive motor provided in an inner space of the casing;a rotating shaft coupled to the drive motor to rotate;an orbiting scroll comprising an orbiting plate portion including a shaft coupling portion coupled to the rotating shaft, and an orbiting wrap that extends toward the casing along a circumference of orbiting plate portion in the shaft coupling portion;a fixed scroll comprising a fixed wrap provided in engagement with the orbiting wrap to compress a refrigerant, a fixed plate portion including an inlet receiving the refrigerant and an outlet spaced apart from the inlet toward the shaft coupling portion to discharge the refrigerant; andan offset portion provided in an area of at least one of the fixed wrap or the ...

Scroll compressor

A diameter of a main bearing member 12 m is defined as Dm, a length thereof is defined as Lm, a diameter of the eccentric bearing member 11 e is defined as De and a length thereof is defined as Le. A ratio (=Lm/Dm) of the length and the diameter of the main bearing member 12 m and a ratio (=Le/De) of the length and the diameter of the eccentric bearing member 11 e are set to Le/De≦Lm/Dm≦1. Therefore, contact at edge portions of both ends of the eccentric bearing member 11 e does not occur, and it is possible to prevent contact at edge portions of both ends of the main bearing member 12 m even if the main shaft 13 m inclines, and to reduce a viscosity loss caused by oil 9 a. Hence, the present invention provides a scroll compressor securing reliability of the bearing members 12 m, 11 e and 16 s and having high efficiency.

Variable Speed Compressor Protection System And Method

A system and method for a compressor includes a compressor connected to a condenser, a discharge line temperature sensor that outputs a discharge line temperature signal corresponding to a discharge line temperature of refrigerant leaving the compressor, and a control module connected to the discharge line temperature sensor. The control module determines a saturated condenser temperature, calculates a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature, and monitors a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold. The control module increases a speed of the compressor when the discharge superheat temperature is less than or equal to the predetermined threshold. 1. A system comprising:a compressor connected to a condenser;a discharge line temperature sensor that outputs a discharge line temperature signal corresponding to a discharge line temperature of refrigerant leaving the compressor;a control module connected to the discharge line temperature sensor, said control module determining a saturated condenser temperature, calculating a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature, monitoring a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold, and, when the discharge superheat temperature is less than or equal to the predetermined threshold, increasing a speed of the compressor.2. The system of wherein the predetermined threshold is thirty degrees Fahrenheit.3. The system of wherein the control module increases the speed of the compressor when the discharge superheat temperature is less than or equal to the predetermined threshold.4. The system of wherein the control module decreases an opening of an expansion valve associated with the compressor when the discharge superheat temperature is less than or ...

Magnetic bearing compressor, air conditioner, and protective air gap value setting method

Provided are a magnetic bearing compressor, an air conditioner and a protective air gap value setting method. The magnetic bearing compressor includes: a rotor, a magnetic bearing, a sensor, and a control device. The magnetic bearing is sleeved on the rotor; the sensor is arranged on the magnetic bearing and is configured to detect a distance value between the rotor and the sensor on a preset plane; the control device is configured to receive the distance value and determine the minimum distance value and the maximum distance value between the rotor and the magnetic bearing according to the distance value, and obtain an absolute value of a difference of the maximum distance value and the minimum distance value; and the control device obtains a protective air gap value according to the absolute value and a preset protection coefficient when the absolute value is less than or equal to a preset air gap value.

ELECTRIC COMPRESSOR, CONTROL DEVICE, AND MONITORING METHOD

This electric compressor includes a compressor which rotates around an axis to compress a fluid, a motor which rotatably drives the compressor around the axis, and a control unit having a first component and a second component and controlling current supply to the motor during driving using the first component and the second component. An allowable current when the first component and the second component are exposed to the same temperature is set to be smaller in the second component than in the first component. The second component is disposed at a place in which cooling capability is greater than that of the first component so that allowable power of the second component at rated use is set to be greater than an allowable power of the first component. This electric compressor includes a temperature sensor which detects the temperature of the first component and a calculation unit which outputs an alarm signal when the temperature detected by the temperature sensor and a current flowing in the first component satisfy a predetermined condition. 1. An electric compressor comprising:a compressor which rotates around an axis to compress a fluid;a motor which rotatably drives the compressor around the axis; anda control unit including a first component and a second component and controlling current supply to the motor during driving using the first component and the second component, whereinan allowable current when the first component and the second component are exposed to the same temperature is set to be smaller in the second component than in the first component,the second component is disposed at a place in which cooling capability is greater than that of the first component so that allowable power of the second component at rated use is set to be greater than allowable power of the first component, andthe electric compressor further comprises:a temperature sensor which detects a temperature of the first component; anda calculation unit which outputs an alarm ...

MOTOR-DRIVEN COMPRESSOR

A motor-driven compressor includes an electric motor including a rotor, a housing, a compression unit, a drive circuit, and a controller. The controller includes a deceleration controller that performs a deceleration control, which decelerates the rotor, during a first period in response to the rotor being rotating in a direction opposite to the forward direction, and a continuation controller that performs a continuation control, which continues the rotation of the rotor, during a second period that is longer than the first period after the deceleration control is performed. A fluctuation difference of a rotational frequency of the rotor during the continuation control is less than a deceleration rotational frequency difference. 1. A motor-driven compressor comprising:an electric motor including a rotor;a housing including a suction port that draws in a fluid;a compression unit driven by the electric motor, wherein the compression unit compresses an intake fluid, which is the fluid drawn in from the suction port, and discharges a compressed fluid, which is the compressed intake fluid;a drive circuit that drives the electric motor; anda controller that controls the drive circuit to control rotation of the rotor, wherein a fixed scroll fixed to the housing,', 'a movable scroll engaged with the fixed scroll and configured to orbit the fixed scroll, and', 'a compression chamber defined by the fixed scroll and the movable scroll,, 'the compression unit includes'}when the rotor rotates in a predetermined forward direction, the movable scroll orbits in the forward direction, and the compression unit thereby compresses the intake fluid drawn into the compression chamber,the motor-driven compressor further comprises an injection port that draws an intermediate pressure fluid into the compression chamber, wherein the intermediate pressure fluid has a pressure that is higher than the intake fluid and lower than the compressed fluid, a deceleration controller that performs a ...

MOTOR-DRIVEN COMPRESSOR

A motor-driven compressor includes a three-phase motor including a rotor, a housing, a compression unit, a drive circuit, and a controller. The drive circuit includes u-phase upper and lower arm switching elements, v-phase upper and lower arm switching elements, and w-phase upper and lower arm switching elements. The controller performs a deceleration control in response to the rotor being rotating in a direction opposite to the forward direction. The controller controls the drive circuit in a switching control mode that includes a first mode, in which one or more switching elements of the upper and lower arm switching elements of the three phases are activated while the remaining switching elements are deactivated, and a second mode, which differs from the first mode in a combination of the activated and deactivated switching elements. 1. A motor-driven compressor comprising:a three-phase motor including a rotor;a housing including a suction port that draws in a fluid;a compression unit driven by the three-phase motor, wherein the compression unit compresses an intake fluid, which is the fluid drawn in from the suction port, and discharges a compressed fluid, which is the compressed intake fluid;a drive circuit that drives the three-phase motor; anda controller that controls the drive circuit, wherein a fixed scroll fixed to the housing,', 'a movable scroll engaged with the fixed scroll and configured to orbit the fixed scroll, and', 'a compression chamber defined by the fixed scroll and the movable scroll,, 'the compression unit includes'}when the rotor rotates in a predetermined forward direction, the movable scroll orbits in the forward direction, and the compression unit thereby compresses the intake fluid drawn into the compression chamber,the motor-driven compressor further comprises an injection port that draws an intermediate pressure fluid into the compression chamber, wherein the intermediate pressure fluid has a pressure that is higher than the intake ...

Pump monitoring apparatus and method

A monitoring apparatus comprises at least one sensor for measuring a current of the electric motor to generate a time-based signal and at least one electronic processor configured to transform the time-based signal into a frequency-based signal and to analyse the frequency-based signal to identify a signal pattern representing a pump fault condition. By monitoring the frequency-based signal, the monitoring apparatus can identify a pump fault condition.

Air Compressor

To provide an air compressor capable of achieving energy saving. The air compressor is provided with a compressor body compressing air with injecting oil into a compression chamber; an air-pressure-operated intake throttle valve provided on an intake side of the compressor body; a separator provided on a delivery side of the compressor body and separating, from the compressed air delivered from the compressor body, a liquid contained in the compressed air; a compressed air system supplying the compressed air separated by the separator to a supply destination; an air release system connected to a primary side of a check valve in the compressed air system; an air-pressure-operated air release valve provided in the air release system; and an air-pressure operation circuit having a solenoid-operated three-way valve. 1. An air compressor comprising:a compressor body compressing air with injecting a liquid into a compression chamber;an air-pressure-operated intake throttle valve provided on an intake side of the compressor body;a separator provided on a delivery side of the compressor body, the separator separating, from the compressed air delivered from the compressor body, the liquid contained in the compressed air;a compressed air system supplying the compressed air separated by the separator to a supply destination;a check valve provided in the compressed air system;an air release system connected to a primary side of the check valve in the compressed air system;an air-pressure-operated air release valve provided in the air release system;an air-pressure operation circuit that has at least one solenoid-operated three-way valve, selects one of the primary side of the check valve in the compressed air system and a primary side of the intake throttle valve to make the selected primary side communicate with an operation chamber of the intake throttle valve, and selects one of the primary side of the check valve in the compressed air system and the primary side of the ...

COMPRESSOR WITH FLOODED START CONTROL

A system and method for flooded start control of a compressor having a crankcase heater are provided. A control module receives sensed data from a sensor, determines a current rate of liquid migration into the compressor, and compares the current rate with first and second predetermined thresholds. The control module operates the compressor in a flooded-start control mode, including operating the compressor according to at least one cycle with a first time period when the compressor is on and a second time period when the compressor is off. The control module operates the compressor in the flooded start control mode when the current rate is greater than the first predetermined threshold, activates the crankcase heater when the current rate is between the first and second predetermined thresholds, and operates the compressor without the flooded start control mode when the current rate is less than the second predetermined threshold. 1. A system comprising:a compressor for a refrigeration system, the compressor having a crankcase heater;at least one sensor that generates sensed data corresponding to at least one condition of the refrigeration system;a control module that receives the sensed data from the at least one sensor, determines a current rate of liquid migration into the compressor, and compares the current rate of liquid migration with a first predetermined threshold and a second predetermined threshold, the first predetermined threshold being greater than the second predetermined threshold;wherein the control module operates the compressor in a flooded-start control mode, the flooded start control mode including operating the compressor according to at least one cycle including a first time period during which the compressor is on and a second time period during which the compressor is off; andwherein the control module operates the compressor in the flooded start control mode in response to the current rate of liquid migration being greater than the first ...

VACUUM PUMPING

A vacuum pumping apparatus may include: a common pumping line having a plurality of pumping line inlets and a pumping line outlet, each pumping line inlet being configured to couple with an outlet of an associated plurality of vacuum processing chambers; at least one primary vacuum pump in fluid communication with the pumping line outlet to pump gas from each vacuum processing chamber; and control logic operable to control operation of the primary vacuum pump in response to an indication of an operating state of the plurality of vacuum processing chambers. In this way, the performance of the primary vacuum pump can be adjusted to match the load provided by the processing chambers and when there is an excess capacity, the performance of the primary vacuum pumps can be reduced, which can lead to significant energy savings and reduce wear on the pump. 1. A vacuum pumping apparatus comprising:a common pumping line having a plurality of pumping line inlets and a pumping line outlet, each pumping line inlet being configured to couple with an outlet of an associated plurality of vacuum processing chambers;at least one primary vacuum pump in fluid communication with the pumping line outlet to pump gas from each vacuum processing chamber; andcontrol logic operable to control operation of the at least one primary vacuum pump in response to an indication of an operating state of the plurality of vacuum processing chambers.2. The apparatus of claim 1 , wherein the control logic is operable to vary an operating speed of the at least one primary vacuum pump in response to the indication.3. The apparatus of claim 1 , wherein the control logic is operable to vary the operating speed to match a gas pumping rate of the at least one primary vacuum pump to an indicated gas flow rate from the plurality of vacuum processing chambers.4. The apparatus of claim 1 , wherein the at least one primary vacuum pump comprises a plurality of primary vacuum pumps and wherein the control logic is ...

MOTOR-DRIVEN COMPRESSOR

A motor-driven compressor includes a compression portion, an electric motor, a motor drive circuit having switching element, a temperature detector, and a switcher, which switches the drive mode of the motor drive circuit. When acquiring information indicating that the temperature detected by the temperature detector has increased and reached a first preset temperature, the switcher switches the drive mode of the motor drive circuit from a first drive mode to a second drive mode. Also, when acquiring information indicating that the temperature detected by the temperature detector has increased and reached a second preset temperature, which is higher than the first preset temperature, the switcher switches the drive mode of the motor drive circuit from the first drive mode or the second drive mode to a third drive mode. 1. A motor-driven compressor comprising:a compression portion;an electric motor, which drives the compression portion;a motor drive circuit, which drives the electric motor, wherein the motor drive circuit has a switching element for converting a DC voltage into an AC voltage;a temperature detector, which detects a temperature of the switching element; anda switcher, which switches a drive mode of the motor drive circuit to one of a first drive mode, a second drive mode, and a third drive mode, which are determined by a carrier frequency and modulation control, whereinwhen acquiring information indicating that the temperature detected by the temperature detector has increased and reached a first preset temperature, the switcher switches the drive mode of the motor drive circuit from the first drive mode to the second drive mode, andwhen acquiring information indicating that the temperature detected by the temperature detector has increased and reached a second preset temperature, which is higher than the first preset temperature, the switcher switches the drive mode of the motor drive circuit from the first drive mode or the second drive mode to the ...

Compressor Having Oil-Level Sensing System

A compressor may include a shell containing a motor, a compression mechanism and a lubricant sump. The compressor may also include first and second temperature sensors, and a control module. The first temperature sensor may be at least partially disposed within the lubricant sump and may measure a first temperature of a lubricant at a first position. The second temperature sensor may be at least partially disposed within the lubricant sump and may measure a second temperature of the lubricant at a second position that is vertically higher than the first position. The control module is in communication with the first and second temperature sensors. The control module may determine a first difference between the first temperature and the second temperature. The control module may determine whether a liquid level of the lubricant in the lubricant sump is below a predetermined level based on the first difference. 1. A compressor comprising:a shell including a motor, a compression mechanism and a lubricant sump;a first temperature sensor at least partially disposed within said lubricant sump and configured to measure a first temperature of a lubricant at a first position;a second temperature sensor at least partially disposed within said lubricant sump and configured to measure a second temperature of said lubricant at a second position that is vertically higher than said first position; anda control module in communication with said first and second temperature sensors, said control module configured to determine a first difference between the first temperature and the second temperature, said control module configured to determine whether a liquid level of said lubricant in said lubricant sump is below a predetermined level based on said first difference.2. The compressor of claim 1 , wherein a vertical height of said second position is equal to a vertical height of said predetermined level.3. The compressor of claim 1 , wherein said predetermined level equals a ...

SCROLL COMPRESSOR

[Problem] A scroll compressor is provided which is capable of effectively reducing a pressure loss in a pathway extending from a discharge space to a discharge port.

COMPRESSOR AND AIR CONDITIONING SYSTEM

A compressor and an air conditioning system. The compressor includes two compressing structures and an intermediate gas supplement structure. A communication pipe is provided between a gas exhaustion port of one compressing structure and a gas suction port of another compressing structure in the two compressing structures. The intermediate gas supplement structure is in communication with the communication pipe. At least one compressing structure is provided with a gas supplement structure. In the compressor and the air conditioning system, the gas supplement structure is provided to at least one compressing structure, so that at least two levels of gas supplement to the compressor are provided.

HEAT PUMP DEVICE, HEAT PUMP SYSTEM, AIR CONDITIONER, AND REFRIGERATION MACHINE

A heat pump device includes a compressor that compresses refrigerant, a motor that drives the compressor, an inverter that applies a desired voltage to the motor, and an inverter controlling unit that generates a pulse width modulation signal for driving the inverter, has, as operation modes, a heating operation mode performing heating operation of the compressor and a normal operation mode performing normal operation of the compressor to compress the refrigerant, and periodically changes carrier frequency, that is frequency of a carrier signal, in the heating operation mode.

METHOD AND APPARATUS FOR PRESSURE EQUALIZATION IN ROTARY COMPRESSORS

A high side compressor system includes a compressor housing, motor, and a compression chamber. The compression chamber is disposed within the compressor housing. An accumulator is fluidly coupled to the compressor housing via a pressure-equalization tube. A pressure-equalization valve is disposed in the pressure-equalization tube. The pressure-equalization valve closes access to the pressure-equalization tube responsive to an electrical current being applied to the pressure-equalization valve. The pressure-equalization valve is electrically coupled to a compression mechanism such that interruption of electrical current to the compression mechanism interrupts electrical current to the pressure-equalization valve thereby opening the pressure-equalization valve 1. A rotary compressor system comprising:a motor disposed within a compressor housing;an accumulator fluidly coupled to the compressor housing via a pressure-equalization tube;a pressure-equalization valve disposed in the pressure-equalization tube to limit refrigerant flow through the pressure-equalization tube;wherein the pressure-equalization valve is configured to control access to the pressure-equalization tube responsive to whether an electrical current is applied to the pressure-equalization valve;responsive to a determination that the electrical current is applied to the pressure-equalization valve, the pressure-equalization valve closes access to the pressure-equalization tube; andwherein the pressure-equalization valve is electrically coupled to the motor such that interruption of the electrical current to the motor interrupts the electrical current to the pressure-equalization valve thereby opening the pressure-equalization valve.2. The rotary compressor system of claim 1 , wherein the pressure-equalization valve is located outside the compressor housing.3. The rotary compressor system of claim 2 , wherein the pressure-equalization valve is electrically coupled to the compressor housing via a terminal ...

Device for detecting a non-optimal lubrication condition in a compressor of a refrigeration system, a compressor unit which comprises the device and a method for detecting a non-optimal lubrication condition in a compressor of a refrigeration system

1. A device ( 10 ) for detecting a non-optimal lubrication condition in a compressor ( 100 ) of a refrigeration system ( 1000 ), which comprises a transducer unit ( 11 ) designed to detect sound vibrations and emit an electrical signal as a function of the frequency of the sound vibrations. The device ( 10 ) is configured to be fixed to an external wall of a compressor ( 100 ) in such a way that, in use, the transducer unit ( 11 ) detects sound vibrations which are emitted by the said compressor ( 100 ). The transducer unit ( 11 ) is connectable to an electronic device for processing said electrical signal so as to signal if, in use, said frequency exceeds a predefined threshold that corresponds to a non-optimal lubrication condition of the compressor ( 100 ).

SCROLL COMPRESSOR

[Problem] A scroll compressor is provided which has improved workability when a back pressure chamber and a compression chamber are communicated with each other. 1. A scroll compressor which has a compression mechanism including a fixed scroll and a movable scroll respectively formed at surfaces of mirror plates with spiral laps facing each other , and in which the movable scroll is revolved and turned with respect to the fixed scroll to thereby compress a working fluid in a compression chamber formed between the laps of both scrolls , comprising:a back pressure chamber formed in a back surface of the mirror plate of the movable scroll; anda communication hole formed in the mirror plate of the movable scroll and communicating the back pressure chamber and the compression chamber with each other,wherein the communication hole is constituted of a large-diameter hole section located on the back pressure chamber side of the mirror plate of the movable scroll and a small-diameter hole section continuously extending from the large-diameter hole section to the compression chamber.2. The scroll compressor according to claim 1 , wherein the length dimension of the small-diameter hole section is smaller than the length dimension of the large-diameter hole section.3. A scroll compressor which has a compression mechanism including a fixed scroll and a movable scroll respectively formed at surfaces of mirror plates with spiral laps facing each other claim 1 , and in which the movable scroll is revolved and turned with respect to the fixed scroll to thereby compress a working fluid in a compression chamber formed between the laps of both scrolls claim 1 , comprising:a back pressure chamber formed in a back surface of the mirror plate of the movable scroll;a mounting hole formed in the mirror plate of the movable scroll and extending from the back pressure chamber to the compression chamber; anda communication member installed in the mountingwherein the communication member has a ...

REFRIGERANT BYPASS SOLUTION

Systems, methods, and computer-readable mediums are provided for improving the efficiency of a filter-type oil separator in a cooling system including a compressor that pumps a mixture of lubricating oil and refrigerant through the filter-type oil separator. The filter type oil separator is configured to receive a first portion of the mixture from the compressor, and a bypass line is configured to bypass a second portion of the mixture around the filter-type oil separator. The bypass line ensures a sufficient amount of oil is present in the compressor. 1. A system improving efficiency of a filter-type oil separator , the system comprising:a compressor configured to compress and pressurize a mixture of refrigerant and lubricant;a filter-type oil separator configured to receive a first portion of the compressed mixture of refrigerant and lubricant from the compressor; anda bypass line configured to bypass a second portion of the compressed mixture of refrigerant and lubricant around the filter-type oil separator.2. The system of claim 1 , further comprising:a bypass valve configured to receive the second portion of the mixture of refrigerant and lubricant and provide a bypass path around the filter-type oil separator for the second portion of the mixture.3. The system of claim 2 , wherein the bypass line includes the bypass valve.4. The system of claim 2 , further comprising: process one or more input signals;', 'determine a speed value of the compressor based on the one or more input signals; and', 'adjust the bypass valve based on the speed value., 'a controller configured to5. The system of claim 4 , wherein the compressor is a variable speed compressor; andthe one or more input signals represent a driving frequency of the compressor.6. The system of claim 4 , wherein the controller is configured to determine the speed value by calculating a value of refrigerant gas flow rate at a discharge side of the compressor and determining a correspondence between compressor ...

CONTROL METHOD AND CONTROL SYSTEM FOR SCREW PUMP

A control method is used with a control system to control a screw pump. The control system includes an electric motor and a motor drive. The control method includes following steps. Firstly, a DC bus voltage is monitored. If the DC bus voltage is smaller than a first threshold value, a potential energy stored in the pump screw and released by a backspin action is converted into a regenerative electrical energy so as to maintain a normal operation of the motor drive. Then, the motor drive drives the electric motor to control the backspin action of the screw pump according to a backspin torque limit strategy. If the electrical power from the power source is not restored and the level of a reverse regenerative torque is smaller than a preset torque value, the backspin action of the screw pump is stopped freely. 1. A control method for use with a control system to control a screw pump , the control system comprising an electric motor and a motor drive , the electric motor being synchronously rotated with the screw pump , the motor drive controlling an operation of the electric motor , the motor drive comprising a DC/AC converter for converting a DC bus voltage into a driving voltage so as to drive the electric motor , the DC bus voltage being obtained by converting an electrical power from a power source , the control method comprising steps of:(a) monitoring the DC bus voltage;(b) judging whether the DC bus voltage is smaller than a first threshold value, wherein if a judging result of the step (b) indicates that the DC bus voltage is smaller than the first threshold value, a step (c) is performed;(c) allowing a potential energy stored in the pump screw and released by a backspin action to be converted into a regenerative electrical energy, and providing the regenerative electrical energy to the motor drive to maintain a normal operation of the motor drive;(d) allowing the motor drive to drive the electric motor to control the backspin action of the screw pump ...

INFORMATION PROCESSING APPARATUS, INFORMATION PROCESSING SYSTEM, INFORMATION PROCESSING METHOD, PROGRAM, SUBSTRATE PROCESSING APPARATUS, CRITERION DATA DETERMINATION APPARATUS, AND CRITERION DATA DETERMINATION METHOD

An information processing apparatus detecting presence or absence of abnormality of a vacuum pump derived from a product produced within a target vacuum pump, including: 1. An information processing apparatus detecting presence or absence of abnormality of a vacuum pump derived from a product produced within a target vacuum pump , comprising:a determination unit configured to determine a normal variation range or a normal time variation behavior of a target state quantity which is a state quantity varying depending on a load of gas flowing into the vacuum pump, based on at least one of past target state quantities of the target vacuum pump or another vacuum pump; anda comparison unit configured to compare a current target state quantity of the target vacuum pump with the normal variation range or the normal time variation behavior and output the comparison result.2. The information processing apparatus according to claim 1 ,wherein the determination unit corrects the past target state quantity based on a pressure in the target vacuum pump or a pressure in the other vacuum pump, and determines the normal variation range or the normal time variation behavior using the corrected past target state quantity, andthe comparison unit corrects the current target state quantity of the target vacuum pump based on the pressure in the target vacuum pump or the pressure in the other vacuum pump, and compares the corrected target state quantity with the normal variation range or the normal time variation behavior.3. The information processing apparatus according to claim 1 , wherein the determination unit determines the normal variation range or the normal time variation behavior of the target state quantity for each process based on the target information amount for each process corresponding to a predetermined number of times after the target vacuum pump is operated claim 1 , andthe comparison unit compares the current target state quantity of the target vacuum pump with the ...

Load Identification Method for Reciprocating Machinery Based on Information Entropy and Envelope Features of Axis Trajectory of Piston Rod

A load identification method for reciprocating machinery based on information entropy and envelope features of an axis trajectory of a piston rod. According to the present disclosure, firstly, the position of an axial center is calculated according to a triangle similarity theorem to obtain an axial center distribution; secondly, features are extracted from the axial center distribution of the piston rod by means of an improved envelope method for discrete points as well as an information entropy evaluation method; thirdly, a dimensionality reduction is carried out on the features by means of manifold learning to form a set of sensitive features of the load; and finally, a neural network is trained to obtain a load identification classifier to fulfill automatic identification on the operating load of the reciprocating machinery. The advantages of the present disclosure are verified by means of actual data of a piston rod of a reciprocating compressor. 1{'sub': m', '1', '2', '3', 'm', 'm', '1', '2', '3', 'm', 'n', 'm', 'm', '1', 'm', 'm', '2', 'm', 'm', 'n, 'sup': T', 'T', 'T', 'T, 'step 1. setting different load conditions Load={0, d, 2d, 3d, . . . , wd}, w=0, 1, 2, . . . wherein d represents a load gradient, and the number of the load conditions is (w+1) in total; respectively acquiring, by an on-line monitoring system of reciprocating machinery, an original deflection displacement X={x, x, x, . . . , x} and original settlement displacement Y={y, y, y, . . . , y} of a piston rod in a corresponding load condition through an eddy current displacement sensor in a horizontal direction and an eddy current displacement sensor in a vertical direction to obtain an original data set XY={X,Y), (X,Y), . . . , (X,Y)}, wherein m represents the number of sampling points, and n represents the number of data groups;'}{'sub': m', 'm', 'm', '1', '2', '3', 'm', 'm', '1', '2', '3', 'm', 'n', 'm', 'm', 'm', '2', 'm', 'm', 'n, 'sup': T', 'm', 'T', 'T', 'T, 'step 2. removing average ...

Compressor And Method Of Autonomously Inspecting Oil

Systems and techniques are disclosed to sense a temperature and a flow rate of oil in a compressor. A compressor includes: a casing; a frame on the casing; a fixed scroll on the frame; an orbiting scroll supported by the frame and defining a compression chamber while engaging the fixed scroll; and a crank shaft. The crank shaft transfers, to the orbiting scroll, a rotational force of a motor. The casing includes: a main housing including a refrigerant discharge passage and an oil passing passage; and a sub-housing including a refrigerant discharge port and an oil channel, which includes an oil reservoir, that each face the main housing. A sensor module attached to a sensor receptor in the sub-housing includes: a sensor housing covering the sensor receptor; and an oil sensor and a temperature sensor located on the sensor housing that each protrude towards the oil reservoir. 1. A compressor comprising:a casing;a frame fixed on the casing;a fixed scroll fixed on the frame;an orbiting scroll supported by the frame and defining a compression chamber while engaging with the fixed scroll; anda crank shaft coupled to the orbiting scroll and configured to transfer, to the orbiting scroll, a rotational force of a motor, a main housing comprising a refrigerant discharge passage and an oil passing passage; and', 'a sub-housing comprising a refrigerant discharge port and an oil channel that each face the main housing, the oil channel including an oil reservoir,, 'wherein the casing comprises a sensor housing covering the sensor receptor; and', 'an oil sensor and a temperature sensor that are each located on the sensor housing and that each protrude towards the oil reservoir., 'a sensor module attached to a sensor receptor in the sub-housing, the sensor module comprising2. The compressor of claim 1 , further comprising:a partition wall located in at least one of the main housing or the sub-housing, the partition wall partitioning a space between the main housing and the sub- ...

DEVICE FOR COMPRESSING AND EXPANDING A GAS AND METHOD FOR CONTROLLING THE PRESSURE IN TWO GRIDS OF A DIFFERENT NOMINAL PRESSURE LEVEL

A device for compressing and expanding gases, wherein the device comprises an apparatus that can be driven in two directions, whereby in one direction the apparatus operates to compress a gas and in the other direction the apparatus operates to expand a gas. 121-. (canceled)22. A device for compressing and expanding gases , whereby the device comprises an apparatus that can be driven in two directions , whereby in one direction the apparatus operates to compress a gas and in the other direction the apparatus operates to expand a gas , whereby the device comprises a high pressure pipe that connects the apparatus to a high pressure network and a low pressure pipe that connects the apparatus to a low pressure network , whereby the apparatus , when it is driven in one direction , can compress gas from the low pressure network to the high pressure network , and when it is driven in the other direction , gas can be expanded from the high pressure network to the low pressure network wherein the high pressure pipe or in the low pressure pipe an inlet valve is affixed for controlling the supply of gas from the high pressure network to the low pressure network via the apparatus , whereby a non-return valve is provided in parallel to this inlet valve , whereby this non-return valve allows a gas flow from the low pressure pipe to the high pressure pipe.23. The device according to claim 22 , wherein when the apparatus operates for expanding a gas claim 22 , energy can be recovered from the gas by the device.24. The device according to claim 22 , wherein the apparatus is an adapted screw expander-compressor with two meshed screws that are mounted on bearings in a housing that is provided with two passages claim 22 , of which the first passage can act as an inlet or an outlet depending on whether the apparatus is driven in one direction for compressing gas or in the other direction for expanding gas claim 22 , while the second passage can act as an outlet or inlet depending on ...

METHODS AND SYSTEMS FOR PREVENTING PREMATURE COMPRESSOR FAILURE FROM IMPROPER OPERATION

Methods and systems for detecting and correcting improper operation of a compressor in a refrigeration system and/or an HVAC system include a component level detection and prevention and a system level detection and prevention. The system level detection and prevention can be a backup or a confirmation of the component level detection and prevention. The component level detection and prevention can detect and prevent improper compressor operation within a predetermined time so that the compressor's operation period in an improper direction can be minimized, thereby minimizing wear and damage to the compressor. 1. A method for detecting and correcting an improper operation of a compressor of a refrigerant circuit , the method comprising:starting the compressor by a compressor drive module;upon starting the compressor, detecting whether the compressor is operating improperly by comparing a first measured sensor profile of a refrigerant circuit parameter and a previously stored start-up sensor profile, the first measured sensor profile tracking sensed values of the parameter over a first predetermined period of time;confirming operation of the compressor when it is detected that the compressor is operating improperly;correcting operation of the compressor when it is confirmed that the compressor is operating improperly; andoperating the compressor when it is detected that the compressor is operating properly.2. The method according to claim 1 , wherein correcting operation of the compressor includes:stopping the compressor by the compressor drive module;reversing an operation direction of the compressor by the compressor drive module; andre-staring the compressor in the reversed operation direction.3. The method according to claim 1 , wherein operating the compressor includes:storing an operational information of the compressor in the memory of the compressor drive module; andoperating the compressor to compress refrigerant directed through the refrigerant circuit.4. ...

ELECTRICALLY DRIVEN MOBILE COMPRESSOR OR PUMP AND METHOD FOR CONTROLLING THE MAXIMUM CURRENT THAT IS TAKEN FROM A POWER SUPPLY

Electrically driven mobile compressor or pump, comprising at least one compressor element or pump element for supplying a pressurised fluid to a network of consumers of such pressurised fluid; an electric drive motor with a variable speed control coupled to the compressor element or pump element and a controller for the variable speed control of the electric drive motor as a function of the flow rate of compressed gas and/or pressure demanded by the network, and a connection for connection of the compressor or pump to an electricity supply source, and the controller is provided with an algorithm with which the electric current drawn from the supply source can be limited to a set or adjustable maximum value by controlling the speed. 129.-. (canceled)30. An electrically driven mobile compressor or pump comprising at least one compressor element or pump element for supplying a pressurised fluid to a network of consumers of such pressurised fluid; an electric drive motor with a variable speed control coupled to the compressor element or pump element , and an electric or electronic controller comprising a first controller configured to control the speed or the pressure of the compressor or pump , respectively as a function of a set desired pressure or a set desired flow rate , of the pressurised fluid demanded by the network , and a second controller configured for the variable speed control of the electric drive motor as a function of a desired speed that is determined by the first controller , and a connection for connecting the compressor or pump to an electricity supply source , wherein the controller is provided with an algorithm with which the electric current drawn from the supply source can be limited to a set or adjustable maximum value by limiting the desired set speed , or the desired set pressure , to a maximum value and whereby the electric or electronic control that limits the speed or the pressure in order not to exceed a maximum drawn current , is a ...

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.

Motor-driven compressor

A motor-driven compressor includes an electric motor driven by a motor driver, which includes a switching element that converts DC voltage from a battery to AC voltage. A control unit controls the switching operation of the switching element. A temperature detector detects the temperature of the switching element. A voltage detector detects DC voltage applied to the switching element from the battery. The control unit suspends the switching operation of the switching element when the temperature detected by the temperature detector rises to a predetermined temperature threshold. The control unit also reduces counter electromotive force generated by the electric motor. The temperature threshold includes a first temperature threshold, corresponding to a withstand temperature of the switching element, and a second temperature threshold, which is higher than the first temperature threshold. The control unit switches the temperature threshold between the first and second temperature thresholds.

Scroll compressor

A scroll compressor is provided that may include a communication hole that penetrates from a side surface of a non-orbiting scroll adjacent to a discharge side to a thrust bearing surface between the non-orbiting scroll and an orbiting scroll, and a decompression member having a radial sectional area smaller than a radial sectional area of the communication hole and inserted into the communication hole. A refrigerant discharged to a discharge space may be introduced to a suction space through the passage between the communication hole and the decompression member, thereby preventing a high vacuum state of a compression chamber, and a refrigerant passing through the communication hole may be decompressed during a normal operation to restrain leakage of the refrigerant to the thrust bearing surface between the non-orbiting scroll and the orbiting scroll, thus increasing compression efficiency.

VIRTUAL SENSOR FOR WATER CONTENT IN OIL CIRCUIT

A method for monitoring an oil-injected screw compressor configured to compress aspirated air by returning oil from an oil separator vessel () to a compression chamber () of a compressor block (), for condensate formation in the oil circuit due to a too low compression discharge temperature (VET), determines a water inlet mass flow {dot over (m)}(t) and a water outlet mass flow {dot over (m)}(t) for a point in time t and determines generated condensate flow Δ{dot over (m)}(t)={dot over (m)}(t)−{dot over (m)}(t) on the basis of difference formation. 1111230. A method for monitoring an oil-injected screw compressor configured to compress aspirated air , in which oil from an oil separator tank () is fed back to a compression chamber () of a compressor block () , for condensate formation in the oil circuit due to a low compression discharge temperature (VET) ,{'sub': ein', 'aus', 'w', 'ein', 'aus, 'wherein a water inlet mass flow {dot over (m)}(t) and a water outlet mass flow {dot over (m)}(t) are determined for a point in time t and generated condensate flow Δ{dot over (m)}(t)={dot over (m)}(t)−{dot over (m)}(t) is determined on the basis of a difference formation.'}2. The method according to claim 1 , wherein a condensate mass mwhich has been generated in this time interval is calculated from a summation of the condensate flows occurring in a time interval claim 1 , wherein the calculation preferably takes place as follows: m(t)=m(t−dt)+Δ{dot over (m)}*dt (for example with dt=1 s).3. The method according to claim 1 , wherein the total generated condensate mass m(t) is calculated from a known initial value of the condensate mass m(t) by numerical integration of the condensate flow Δ{dot over (m)}over time.5. The method according to claim 4 , wherein claim 4 , at m(t)>m claim 4 , a target value for the compression discharge temperature (VET) is increased by a predetermined amount claim 4 , in particular by a predetermined temperature value claim 4 , e.g. VET=VET+5 K.7. ...

CRANKCASE HEATER SYSTEMS AND METHODS FOR VARIABLE SPEED COMPRESSORS

A system includes a compressor having a shell housing a compression mechanism driven by an electric motor in an on state and not driven by the electric motor in an off state. The system also includes a variable frequency drive that drives the electric motor in the on state by varying a frequency of a voltage delivered to the electric motor and that supplies electric current to a stator of the electric motor in the off state to heat the compressor.

ENCLOSURE SYSTEM INCLUDING WIRE MESH AND THIN NON-POROUS MEMBRANE PANELS

An enclosure system may be formed of a lightweight panel with a thin non-porous membrane that enables the extraction and leak detection of hazardous gases from housing equipment such as vacuum pumps, valves, abatement equipment and the like. Additionally, the enclosure system includes a one or multiple layers of wire mesh which prevent projectiles with a high kinetic energy from escaping from the housing equipment thereby minimising the risk of an explosion causing parts or panels to be ejected from the enclosure system. 1. An enclosure for minimising egress of hazardous gases released from post process chamber equipment during operation thereof , the enclosure comprising:a structural frame describing an outer envelope of post process chamber equipment to be housed therein;an outlet configured to be connected to an extraction system; anda plurality of panels, each panel of the plurality of panels comprising a respective sub-frame to which is connected a respective mesh layer in combination with a respective non-porous membrane layer, the respective mesh and respective non-porous membrane layers of each panel being substantially co-planar with one another, wherein the plurality of panels are mounted to the structural frame in a contiguous manner such that, in use, a pressure internal to the enclosure, lower than that experienced external to the enclosure, can be maintained thereby inhibiting inadvertent egress of any hazardous gases present in the enclosure.2. The enclosure according to claim 1 , wherein one or more panels of the plurality of panels are removably mounted to the structural frame.3. The enclosure according to claim 1 , wherein the respective non-porous membrane layers comprise a rubber or a polymer.4. The enclosure according to claim 1 , wherein the respective non-porous membrane layers are configured to rupture upon catastrophic failure of equipment housed within the enclosure.5. The enclosure according to claim 4 , wherein the thickness of the ...

METHOD AND APPARATUS FOR PRESSURE EQUALIZATION IN ROTARY COMPRESSORS

A high side compressor system includes a compressor housing, motor, and a compression chamber. The compression chamber is disposed within the compressor housing. An accumulator is fluidly coupled to the compressor housing via a pressure-equalization tube. A pressure-equalization valve is disposed in the pressure-equalization tube. The pressure-equalization valve closes access to the pressure-equalization tube responsive to an electrical current being applied to the pressure-equalization valve. The pressure-equalization valve is electrically coupled to a compression mechanism such that interruption of electrical current to the compression mechanism interrupts electrical current to the pressure-equalization valve thereby opening the pressure-equalization valve 1. A rotary compressor system comprising:a compressor housing;a compression mechanism disposed within the compressor housing;an accumulator fluidly coupled to the compressor housing via a pressure-equalization tube;a pressure-equalization valve disposed in the pressure-equalization tube, the pressure-equalization valve closing access to the pressure-equalization tube responsive to an electrical current being applied to the pressure-equalization valve; andwherein the pressure-equalization valve is electrically coupled to the compression mechanism such that interruption of electrical current to the compression mechanism interrupts electrical current to the pressure-equalization valve thereby opening the pressure-equalization valve.2. The rotary compressor system of claim 1 , wherein the pressure-equalization valve is located outside the compressor housing.3. The rotary compressor system of claim 2 , wherein the pressure-equalization valve is electrically coupled to the compressor housing via a terminal.4. The rotary compressor system of claim 1 , wherein the pressure-equalization valve is located within the compressor housing claim 1 ,5. The rotary compressor system of claim 4 , wherein the pressure-equalization ...

Method for monitoring an operating state of a pumping device

A method is for surveillance of an operating state of a pumping device connected to a process chamber in order to determine a failing operating state of the pumping device. The pumping device includes at least one rough-vacuum pump including a motor for driving the rough-vacuum pump and a variable speed drive to control the rotation speed of the motor, to receive a first input parameter corresponding to a set point frequency and a second input parameter corresponding to a motor current, and to deliver to the motor an output parameter corresponding to a control frequency. A failing operating state is determined when in steady-state operation the difference between the first input parameter and the output parameter is equal to or exceeds 10% of the first input parameter for a predetermined time greater than 3 seconds. The method can be implemented in a pumping device and an installation.

DRIVE DEVICE FOR ELECTRIC COMPRESSOR

A drive device of a compressor, including an inverter circuit formed of a plurality of switching elements, a drive unit that switches the switching elements, a determination unit that, when the compression mechanism restarts, determines whether a pressure difference of the compression mechanism is equal to or above a predetermined value, a restart unit that sets a number of times that the switching elements are switched per unit time during an initial predetermined period when the compression mechanism begins to restart and controls the drive unit, where the restart unit sets the number of times that the switching elements are switched per unit time to be lower when the determination unit determines that the pressure difference is equal to or above the threshold as compared to when the determination unit determines that the pressure difference is less than the threshold. 1. A drive device of an electric compressor that drives a compression mechanism to compress a fluid due to a rotation force of a rotor which is rotated by a rotating magnetic field generated from a stator coil of a synchronous motor , the drive device comprising:an inverter circuit formed of a plurality of switching elements;a drive unit that switches the plurality of switching elements to flow an alternating current from the inverter circuit to the stator coil based on a direct current voltage output from a direct current power source to generate the rotating magnetic field from the stator coil;a determination unit that, when the compression mechanism restarts after a stoppage of the compression mechanism, determines whether a pressure difference between a fluid intake side and a fluid discharge side of the compression mechanism is equal to or above a predetermined value; and sets a number of times that the switching elements are switched per unit time during an initial predetermined period when the compression mechanism begins to restart, and', 'controls the drive unit such that an alternating ...

Scroll Vacuum Pump and Method of Maintenance Including Replacing a Tip Seal of a Scroll Vacuum Pump

A scroll pump has a tip seal between an axial end of the scroll blade of one of stationary and orbiting plate scrolls of the pump and the plate of the other of the stationary plate and orbiting plate scrolls. The scroll pump may have a ballast gas supply system and use the operation of the ballast gas supply system to assess the condition of the tip seal. Alternatively, the scroll pump may have two pressure sensors that sense pressure at two locations spaced along a compression mechanism of the pump to assess the condition of the tip seal. 1. A method of operating and maintaining a scroll vacuum pump , the method comprising:running the scroll pump while the pump is connected to a system, at an inlet of the scroll pump, to discharge fluid from the system;while the scroll pump is discharging fluid from the system, sensing a first pressure proportional to a first fraction of the compression ratio of the pump and a second pressure proportional to a second fraction of the compression ratio of the pump;calculating a monitored pressure value based on both the first and second sensed pressures;comparing the monitored pressure value based on the first and second sensed pressures with a reference pressure value; andchanging a tip seal, interposed between an axial end of a scroll blade of one of stationary and orbiting plate scrolls and a plate of the other of the stationary plate and orbiting plate scrolls of the scroll pump, at a point in time after the monitored pressure value and the reference pressure value differ by at least a predetermined amount.2. The method of claim 1 , further comprising periodically supplying a ballast gas into a compression mechanism of the scroll pump at a location adjacent a downstream end of the compression mechanism with respect to the direction of fluid flow through the pump claim 1 , while the scroll pump is being run to discharge fluid from the system claim 1 ,the compression mechanism constituted by a series of pockets of the scroll pump ...

Surgical evacuation sensing and display

Surgical systems can include evacuation systems for evacuating smoke, fluid, and/or particulates from a surgical site. A surgical evacuation system can be intelligent and may include one or more sensors for detecting one or more properties of the surgical system, evacuation system, surgical procedure, surgical site, and/or patient tissue, for example.

METHOD FOR TWIN SCREW POSITIVE DISPLACEMENT PUMP PROTECTION

Techniques are provided for protecting a twin screw positive displacement pump, that include a signal processor that receives signaling containing information about power, torque, speed, viscosity and specific gravity related to the operation of the twin screw positive displacement pump; and determines whether to enter an enhanced pump protection mode for the twin screw positive displacement pump based on a relationship between an actual corrected tune ratio and a tuned ratio set point (Tune Ratio SP). In operation, the signal processor determines if the actual corrected tune ratio is<=the actual corrected tune ratio set point (Tune Ratio SP), and if so, then enters the enhanced pump protection mode, else continues to use a basic pump protection mode, and also determines the actual corrected tune ratio based on a ratio of an actual corrected torque (TAcorr) divided by a tuned corrected torque (TTcorr) at a specific operating speed. 1. Apparatus comprising: receive signaling containing information about power, torque, speed, viscosity and specific gravity related to the operation of a twin screw positive displacement pump; and', 'determine whether to enter an enhanced pump protection mode for the twin screw positive displacement pump based at least partly on a relationship between an actual corrected tune ratio and a tuned ratio set point (Tune Ratio SP)., 'a signal processor configured to'}2. Apparatus according to claim 1 , wherein the signal processor is configured to determine if the actual corrected tune ratio is less than or equal to the actual corrected tune ratio set point (Tune Ratio SP) claim 1 , and if so claim 1 , then to enter the enhanced pump protection mode claim 1 , else to continue to use a basic pump protection mode.3. Apparatus according to claim 1 , wherein the signal processor is configured to determine the actual corrected tune ratio based at least partly on a ratio of an actual corrected torque (TAcorr) divided by a tuned corrected torque ( ...

Screw Compressor

A screw compressor, including a compressor housing having a screw rotor chamber arranged therein, two control sliders that are arranged in the screw rotor chamber and on the compressor housing and whereof at least one is arranged in a slider channel of the compressor housing and that are adjacent to both screw rotors by means of slider compression wall surfaces, which is movable in a direction of displacement parallel to the screw rotor axes, a position determining device for the at least one control slider, wherein the position determining device has a position indicator element that is coupled to the at least one control slider, wherein the at least one position indicator element cooperates with a detector element that extends parallel to the direction of displacement of the at least one control slider and along which the position indicator element is movable, and in that the detector element is coupled to an evaluation device that determines the positions of the position indicator element along the detector element. 1. A screw compressor , including a compressor housing having a screw rotor chamber arranged therein , two screw rotors that are arranged in the screw rotor chamber and are mounted on the compressor housing , each rotatably about a respective screw rotor axis , and engage in each other by means of their helical contours and each cooperate with compression wall surfaces which are adjacent thereto and partly surround them in order to receive gaseous medium that is supplied by way of a low-pressure chamber arranged in the compressor housing and to discharge it in the region of a high-pressure chamber that is arranged in the compressor housing , wherein the gaseous medium is enclosed in compression chambers that are formed between the helical contours and compression wall surfaces that are adjacent to the latter with an intake volume at low pressure and is compressed to a final volume at high pressure , and including at least one control slider that is ...

LEAK DETECTOR AND LEAK DETECTION METHOD FOR LEAK-TESTING OBJECTS

A leak detector is provided for leak-testing objects that are to be tested by spraying tracer gas, the leak detector including: a detection inlet configured to be connected to an object that is to be tested; a pumping device including a vacuum line connected to the detection inlet, a rough-vacuum pump connected to the vacuum line, and a turbomolecular vacuum pump connected to the vacuum line, a delivery of which is connected to the rough-vacuum pump; and a gas detector connected to the turbomolecular vacuum pump, the pumping device further including an ancillary pump connected to the rough-vacuum pump and being configured to lower an ultimate-vacuum pressure of tracer gas in the rough-vacuum pump. A leak detection method for leak-testing objects that are to be tested by spraying tracer gas is also provided. 113.-. (canceled)14. A leak detector for leak-testing objects that are to be tested by spraying tracer gas , the leak detector comprising:a detection inlet configured to be connected to an object that is to be tested; a vacuum line connected to the detection inlet,', 'a rough-vacuum pump connected to the vacuum line, and', 'a turbomolecular vacuum pump connected to the vacuum line, a delivery of which is connected to the rough-vacuum pump; and, 'a pumping device comprisinga gas detector connected to the turbomolecular vacuum pump,wherein the pumping device further comprises an ancillary pumping means connected to the rough-vacuum pump and being configured to lower an ultimate-vacuum pressure of tracer gas in the rough-vacuum pump.15. The leak detector according to claim 14 , further comprising:a pressure sensor configured to measure a pressure in the vacuum line; anda control unit connected to the pressure sensor,wherein the pumping device further comprises an ultimate-vacuum electrically-operated valve controllable by the control unit, the ultimate-vacuum electrically-operated valve connecting the ancillary pumping means to the rough-vacuum pump, the control ...

Compressor protection module

A compressor may include a shell, a terminal assembly and an electronics module. The terminal assembly may engage the shell and may include an outwardly extending conductor and a terminal fence at least partially surrounding the conductor. The electronics module may include a back plate having an opening through which the terminal fence may be received. The back plate may include an engagement feature and a spring element. The engagement feature may removably engage the terminal fence. The spring element may contact the shell and bias the back plate away from the shell.

SCROLL COMPRESSOR AND REFRIGERATION CYCLE APPARATUS

A scroll compressor, includes: a pressure container; a frame including a hollow cylindrical portion and a bottom surface portion formed integrally with each other, the hollow cylindrical portion having an outer peripheral surface fixed to an inner peripheral surface of the pressure container; an orbiting scroll including a first base plate and a first spiral tooth formed on one surface of the first base plate, the orbiting scroll being rotatable in a hollow portion of the hollow cylindrical portion; a fixed scroll including a second base plate with a second spiral tooth, the second spiral tooth being meshed with the first spiral tooth; and a second suction pipe communicating with the hollow portion of the hollow cylindrical portion. 1. A scroll compressor comprising:a pressure container;a frame comprising a hollow cylindrical portion and a bottom surface portion formed integrally with each other, the hollow cylindrical portion serving as a side surface portion and having an outer peripheral surface fixed to an inner peripheral surface of the pressure container;an orbiting scroll comprising a first base plate and a first spiral tooth formed on one surface of the first base plate, the orbiting scroll being accommodated in a rotatable manner in a hollow portion of the hollow cylindrical portion so that the first base plate is positioned between the first spiral tooth and the bottom surface portion;a fixed scroll comprising a second base plate and a second spiral tooth formed on one surface of the second base plate, the fixed scroll being fixed to the frame and arranged so that the second spiral tooth is meshed with the first spiral tooth;an electric motor unit configured to eccentrically rotate the orbiting scroll;a discharge pipe communicating with a discharge outlet formed in the second base plate;a first suction pipe arranged between the frame and the electric motor unit, and communicating on an outer side of the frame with a low-pressure space inside the pressure ...

LOAD/UNLOAD CONTROL METHOD FOR COMPRESSOR SYSTEM

The present disclosure describes a load/unload control method for a compressor system with a rotating compressor connected to a pressure vessel. In the method, the present operating state can be monitored on the basis of a monitored/estimated electrical quantity of the compressor system, The method comprises an identification phase and an operational phase. In the identification phase, the compressor is operated at a constant rotational speed to generate two known pressures to the pressure vessel. At least one electrical quantity is monitored, and values of the electrical quantity corresponding to the pressure limits are stored. In the operational phase, reaching of a pressure limit may then be detected by comparing the present value of the monitored electrical quantity to the stored values. 2. A method according to claim 1 , wherein the monitored electrical quantity is measured or estimated by using the frequency converter.3. A method according to claim 2 , wherein the monitored electrical quantity is a mechanical power or torque of the electric motor.4. A method according to any one of claims 1 , wherein the operating of the compressor during the identification phase comprisesoperating the compressor in the load mode to pressurize the pressure vessel in order to determine the second level, andoperating the compressor in the unload mode to depressurize the pressure vessel in order to determine the first level.5. A method according to claim 4 , wherein the determining of the second level is performed when the compressor operates in the load mode and comprisesdetecting a first known pressure inside the pressure vessel and a first value of the at least one electrical quantity corresponding to the first known pressure,detecting a second known pressure inside the pressure vessel and a second value of the at least one electrical quantity corresponding to the second known pressure,forming an interpolation function on the basis the first and second known pressure and the ...

Compressor Having A Control And Diagnostic Module

A system and method includes a power supply that generates an alternating current power for powering a compressor with a capacitor, a voltage sensor that measures voltage values based on the alternating current power, a current sensor that measures current values based on the alternating current power, and a controller. The controller communicates with the voltage sensor and the current sensor, determines a power factor value based on at least one of the voltage values and at least one of the current values, and determines a fault in the capacitor based on the power factor and at least one of the current values. 1generating, with a power supply, an alternating current power for powering a compressor with a capacitor;measuring, with a voltage sensor, a plurality of voltage values based on the alternating current power;measuring, with a current sensor, a plurality of current values based on the alternating current power;determining, with a controller in communication with the voltage sensor and the current sensor, a power factor value based on at least one of the plurality of voltage values and at least one of the plurality of current values;determining, with the controller, a fault in the capacitor based on the power factor and at least one of the plurality of current values; andcommunicating the fault in the capacitor from the controller to at least one of a user, a service person, a system controller, a remote server, a thermostat, a mobile device, and an email address.. A method comprising: The present application is a continuation of U.S. patent application Ser. No. 14/033,604 filed on Sep. 23, 2013, which claims the benefit of U.S. Provisional Application No. 61/705,373, filed on Sep. 25, 2012. The entire disclosures of the above applications are incorporated herein by reference.The present disclosure relates to compressors and, more particularly, to systems and methods of control and diagnostics for a compressor with a run capacitor.The statements in this ...

METHODS AND SYSTEMS TO DETECT AN OPERATION CONDITION OF A COMPRESSOR

Embodiments to help detect operation conditions of a compressor of a TRU in real time by a genset are disclosed. The operation conditions of the compressor can be determined by monitoring a parameter pattern of the genset, such as value changes of a horsepower, a torque, an exhaust temperature, fuel consumption and/or a RPM of a prime mover of the genset, or a current drawn from a generator of the genset, over a period of time. In one embodiment, when a scroll compressor is used in the TRU, the scroll compressor may start a periodical load/unload duty cycle when the TRU reaches its setpoint. The periodical load/unload duty cycle of the scroll compressor can be detected based on a corresponding fluctuation pattern in genset parameters. When this periodically fluctuating pattern of ECU parameters and/or current drawn is detected, the prime mover can be switched to a low operation speed. 1. A method to detect an operation condition of a compressor of a transport refrigeration system comprising:obtaining an operation parameter of a generator set, wherein the generator set includes a prime mover that is configured to drive a generator that supplies power to the compressor;determining an operation parameter pattern based on the operation parameter over a period of time; anddetermining the operation condition of the compressor based on the operation parameter pattern.2. The method of claim 1 , wherein determining the operation condition of the compressor based on the operation parameter pattern includes matching the operation parameter pattern to an association between the operation condition of the compressor and a corresponding operation parameter pattern of the generator set.3. The method of claim 1 , wherein the operation parameter of the generator set includes at least one of a RPM (Revolutions Per Minute) claim 1 , a horse power claim 1 , a torque claim 1 , fuel consumption claim 1 , and/or an exhaust temperature of the prime mover claim 1 , and a current drawn from ...

METHOD AND APPARATUS FOR OIL SENSING IN A COMPRESSOR

A method comprising determining a first temperature of an oil inside a compressor; determining a second temperature at a moveable part of the compressor, wherein the second temperature at the moveable part is determined at a stationary part of the compressor being in contact with the moveable part; and deriving whether the compressor operates in a safe mode or in an unsafe mode based on an analysis of the determined first temperature and the determined second temperature at the moveable part. 1. A method comprising:determining a first temperature of an oil inside a compressor;determining a second temperature at a moveable part of the compressor which moves during the operation of the compressor, wherein the second temperature at the moveable part is determined at a stationary part of the compressor being in contact with the moveable part; andderiving whether the compressor operates in a safe mode or in an unsafe mode based on a relationship of the determined first temperature and the determined second temperature at the moveable part.2. The method according to claim 1 , wherein the first temperature of the oil inside the compressor is determined in an area where oil is collected.3. The method according to claim 1 , wherein the moveable part is lubricated by oil.4. The method according to claim 3 , wherein the oil which temperature is determined travels along an oil path to lubricate the moveable part.5. The method according to claim 1 , wherein the moveable part is an orbiting scroll of a scroll compressor.6. The method according to claim 1 , wherein the method further comprises determining a vibration of the compressor claim 1 , and wherein the step of deriving whether the compressor operates in a safe mode or in an unsafe mode is also based on an analysis of the determined vibration.7. An apparatus comprising:means for determining a first temperature of an oil inside a compressor;means for determining a second temperature at a moveable part of the compressor which ...

Rotary Compressor With Vapor Injection System

A compressor may include a shell, a terminal assembly and an electronics module. The terminal assembly may engage the shell and may include an outwardly extending conductor and a terminal fence at least partially surrounding the conductor. The electronics module may include a back plate having an opening through which the terminal fence may be received. The back plate may include an engagement feature and a spring element. The engagement feature may removably engage the terminal fence. The spring element may contact the shell and bias the back plate away from the shell. 1. A compressor comprising:a shell;a terminal assembly engaging said shell and including an outwardly extending conductor and a terminal fence at least partially surrounding said conductor; andan electronics module including a back plate having an opening through which said terminal fence is received, said back plate including an engagement feature and a spring element, said engagement feature removably engaging said terminal fence, said spring element contacting said shell and biasing said back plate away from said shell.2. The compressor of claim 1 , wherein said spring element includes a resiliently compressible annular gasket.3. The compressor of claim 2 , wherein said annular gasket seals against said shell and said back plate.4. The compressor of claim 1 , wherein said spring element includes a strip integrally formed with said back plate and bulging outward therefrom toward said shell.5. The compressor of claim 1 , wherein said terminal fence includes a plurality of apertures claim 1 , and said engagement feature includes a plurality of flexible tabs having barbs engaging said apertures.6. The compressor of claim 5 , wherein said spring element biases said barbs into engagement with edges of said apertures.7. The compressor of claim 5 , wherein said terminal fence is received between said tabs.8. The compressor of claim 1 , wherein said back plate includes a receptacle including guide rails ...

OIL-COOLED SCREW COMPRESSOR AND CONTROL METHOD THEREFOR

An oil-cooled screw compressor includes a controller having an arithmetic operation section for arithmetically determining a remaining moisture amount Dr from at least a suction temperature Ts, a suction pressure Ps, a discharge temperature Td, and a discharge pressure Pd, an inverter control section for comparing a first rotational speed of a motor at which the remaining moisture amount Dr becomes the target moisture amount and a second rotational speed of the motor at which a discharge pressure Pd becomes the target pressure, and for controlling an inverter so as to drive the motor at the larger one of the first and second rotational speeds, and an air release valve control section for opening an air release valve while the discharge pressure Pd exceeds an air release pressure when the motor is driven at the first rotational speed. 1. An oil-cooled screw compressor comprising:a compressor body configured to be driven by an electric motor;an inverter configured to change a rotational speed of the electric motor;an oil separating and collecting device fluidly connected to a discharge port of the compressor body;an air release valve fluidly connected to the oil separating and collecting device and configured to release air from the oil separating and collecting device;an arithmetic operation section configured to arithmetically operate to determine a remaining moisture amount, which is a moisture amount that may be mixed with an oil in the oil separating and collecting device; anda controller having an inverter control section and an air release valve control section, the inverter control section being configured to compare a first rotational speed of the electric motor at which the remaining moisture amount becomes a target moisture amount and a second rotational speed of the electric motor at which a discharge pressure becomes a target pressure, and to control the inverter so as to drive the electric motor at larger one of the first rotational speed and the second ...

Co-Rotating Compressor

A compressor may include first and second compression members, first and second bearing assemblies, a sensor, and processing circuitry. The second compression member cooperates with the first compression member to define a compression pocket. The first and second bearing assemblies rotatably support the first and second compression members, respectively. The first bearing assembly may include a bearing rotor and a bearing stator. The bearing stator may surround the bearing rotor and may include poles each having a winding. The sensor may measure a radial position of the bearing rotor relative to the bearing stator. The processing circuitry may be in communication with the sensor and may control electrical current supplied to the windings based on the radial position measured by the sensor to adjust the radial position of the bearing rotor relative to the bearing stator. 1. A compressor comprising:a first compression member;a second compression member cooperating with the first compression member to define a compression pocket therebetween;a first bearing assembly supporting the first compression member for rotation about a first rotational axis, the first bearing assembly including an annular bearing rotor and an annular bearing stator, the bearing stator surrounding the bearing rotor and including a plurality of poles each having a winding;a second bearing assembly supporting the second compression member for rotation about a second rotational axis that is parallel to the first rotational axis and offset from the first rotational axis;a gap sensor measuring a radial position of the bearing rotor relative to the bearing stator; andprocessing circuitry in communication with the gap sensor and controlling electrical current supplied to the windings based on the radial position measured by the gap sensor to adjust the radial position of the bearing rotor relative to the bearing stator.2. The compressor of claim 1 , further comprising a plurality of gap sensors ...

Scroll Vacuum Pump and Method of Maintenance Including Replacing a Tip Seal of a Scroll Vacuum Pump

A scroll pump has a tip seal between an axial end of the scroll blade of one of stationary and orbiting plate scrolls of the pump and the plate of the other of the stationary plate and orbiting plate scrolls. The scroll pump may have a ballast gas supply system and use the operation of the ballast gas supply system to assess the condition of the tip seal. Alternatively, the scroll pump may have two pressure sensors that sense pressure at two locations spaced along a compression mechanism of the pump to assess the condition of the tip seal.

Combustion chamber module for an aircraft turbine engine comprising marks facilitating identification during endoscopic inspection of the combustion chamber

The invention relates to a combustion chamber module for an aircraft turbine engine, comprising a combustion chamber defined by an internal annular wall and an external annular wall provided with air intake openings, the module further comprising an internal housing and an external housing. According to the invention, at least one of the internal and external housings has, on the surface thereof facing the combustion chamber, a marking system comprising a plurality of different marks angularly spaced apart from each other, each mark being produced facing one of the air intake openings in order to be visible from inside the combustion chamber and each indicating the angular position of a zone of the combustion chamber comprising the air intake opening.

COMPRESSOR FAULT DIAGNOSTIC APPARATUS AND SYSTEM

A compressor fault diagnostic apparatus including a current sensing unit to sense a current flowing through a motor of the compressor, a fault diagnostic unit to determine whether or not the motor performs a reverse rotation based on the current flowing through the motor, and a cut-off unit to remove power based on a determination of the fault diagnostic unit. 1. A compressor fault diagnostic apparatus , comprising:a current sensing unit to sense a current flowing through a motor within the compressor;a fault diagnostic unit to determine whether or not the motor performs a reverse rotation based on the current flowing through the motor; anda cut-off unit to remove power from the motor based on a determination of the fault diagnostic unit.2. The apparatus of claim 1 , wherein when a value of current flowing through the motor is less than or equal to a preset reference current value claim 1 , the fault diagnostic unit determines that the motor has performed a reverse rotation claim 1 , and controls the cut-off unit to remove the power from the motor.3. The apparatus of claim 2 , wherein the current sensing unit senses a first current flowing through a first winding of the motor of the compressor and a second current flowing through a second winding of the motor claim 2 , respectively claim 2 , andwhen a value of the first current is less than or equal to the reference current value, the fault diagnostic unit controls the cut-off unit to restart the motor.4. The apparatus of claim 3 , wherein when the first current is less than or equal to the reference current value claim 3 , the fault diagnostic unit compares phases of the first current and the second current with each other claim 3 , and determines whether or not the motor performs a reverse rotation based on the phase comparison result.5. The apparatus of claim 4 , wherein when it is determined that a value of the first current is lower than or equal to the reference current value claim 4 , and the phase of the ...

MOTOR-DRIVEN COMPRESSOR

A motor-driven compressor includes an electric motor, a drive circuit, a modulation method controller, a temperature measuring section, a high-temperature (HT) stop controller, and a high-temperature (HT) stop temperature setting section. The high-temperature (HT) stop controller stops the electric motor when the temperature measured by the temperature measuring section is higher than or equal to a predetermined high-temperature (HT) stop temperature. When the modulation method is the three-phase modulation, the HT stop temperature setting section sets the HT stop temperature to a three-phase high-temperature (HT) stop temperature. When the modulation method is the two-phase modulation, the HT stop temperature setting section sets the HT stop temperature to a two-phase high-temperature (HT) stop temperature, which is higher than the three-phase HT stop temperature. 1. A motor-driven compressor comprising:a housing, into which fluid is drawn;a compression portion accommodated in the housing,wherein the compression portion compresses and discharges the fluid;an electric motor accommodated in the housing, wherein the electric motor drives the compression portion;a drive circuit, which drives the electric motor;a modulation method controller, which sets a modulation method of the drive circuit to a three-phase modulation or a two-phase modulation;a temperature measuring section, which measures a temperature of the drive circuit;a high-temperature (HT) stop controller, which stops the electric motor when the temperature measured by the temperature measuring section is higher than or equal to a predetermined high-temperature (HT) stop temperature; anda high-temperature (HT) stop temperature setting section, wherein, when the modulation method is the three-phase modulation, the HT stop temperature setting section sets the HT stop temperature to a three-phase high-temperature (HT) stop temperature, and when the modulation method is the two-phase modulation, the HT stop ...

PUMP COMPRISING A PROXIMITY SENSOR

A dry vacuum pump may include a stator which defines an internal chamber in which a rotor is rotationally mounted. A sensor is mounted to the stator and has an output connected to a processing circuit arranged to analyse the output of the sensor to determine the absolute distance between a point on the surface of the rotor and internal stator surface. The rotor to stator clearance can thus be accurately determined in real time during operation of the pump, so that the pump performance can be optimised over its serviceable life. 1: A pump comprising:a stator which defines an internal chamber in which a rotor is rotationally mounted; anda sensor mounted to the stator and connected to a processing circuit, the processing circuit being configured to analyse an output of the sensor to determine an absolute distance between a point on a surface of the rotor and the sensor.2: The pump as claimed in claim 1 , wherein the sensor is set a known distance away from an internal wall of the internal chamber claim 1 , the processing circuit being configured to calculate the distance between the point on the surface of the rotor and the internal wall of the internal chamber.3: The pump as claimed in claim 1 , wherein the processing circuit comprises a display which displays the absolute distance in real time.4: The pump as claimed in claim 2 , wherein the processing circuit is configured to store a value representative of an optimal distance between the point on the surface of the rotor and the internal wall of the internal chamber and to display a deviation of the absolute distance from the optimal distance.5: The pump as claimed in claim 1 , wherein the processing circuit is configured to produce an output or warning if the absolute distance is outside a predetermined limit.6: The pump as claimed in claim 1 , wherein the processing circuit is configured to store a value representative of the absolute distance for successive cycles of the rotor and to analyse the stored values.7: ...

COMPRESSOR FLOODBACK PROTECTION SYSTEM

A climate-control system may include a compressor, a condenser, an evaporator, a first sensor, a second sensor, a third sensor, and a control module. The compressor may include a motor and a compression mechanism. The condenser receives compressed working fluid from the compressor. The evaporator is in fluid communication with the compressor and disposed downstream of the condenser and upstream of the compressor. The first sensor may detect an electrical operating parameter of the motor. The second sensor may detect a discharge temperature of working fluid discharged by the compression mechanism. The third sensor may detect a suction temperature of working fluid between the evaporator and the compression mechanism. The control module is in communication with the first, second and third sensors and may determine whether a refrigerant floodback condition is occurring in the compressor based on data received from the first, second and third sensors. 1. A climate-control system comprising:a compressor having a motor and a compression mechanism;a condenser receiving compressed working fluid from the compressor;an evaporator in fluid communication with the compressor and disposed downstream of the condenser and upstream of the compressor;a first sensor detecting an electrical operating parameter of the motor;a second sensor detecting a discharge temperature of working fluid discharged by the compression mechanism;a third sensor detecting a suction temperature of working fluid between the evaporator and the compression mechanism; anda control module in communication with the first, second and third sensors and determining whether a refrigerant floodback condition is occurring based on data received from the first, second and third sensors.2. The climate-control system of claim 1 , wherein the control module determines whether the floodback condition is occurring based on a comparison between a calculated discharge-superheat-value and a predetermined discharge-superheat- ...

Compressor Capacity Modulation System For Multiple Compressors

A system includes a plurality of compressors, an evaporator, an expansion device, and a system controller. The compressors may be linked in parallel. The system controller may: determine a saturated evaporator temperature, a saturated condensing temperature, and a target capacity demand; determine an estimated system capacity and an estimated power consumption for each compressor operating configuration; compare the estimated system capacity with the target capacity demand and an error tolerance value; select an optimum operating mode based on the comparisons and based on the estimated power consumption; and command activation and deactivation of the plurality of compressors to achieve the selected optimum operating mode. The optimum operating mode may be selected after the normal system logic achieves a steady state and may be selected from a group having the estimated system capacity within the error tolerance of the target capacity demand and a lowest associated power consumption value. 1. A system comprising:a plurality of compressors linked in parallel by a common discharge line and a common suction line;an evaporator;a condenser; anda system controller that determines a saturated evaporator temperature of the evaporator, a saturated condensing temperature of the condenser, a target capacity demand for the plurality of compressors, and an estimated system capacity and an estimated power consumption for each operating configuration of the plurality of compressors based on the saturated evaporator temperature and the saturated condensing temperature;wherein the system controller compares the estimated system capacity for each operating configuration with the target capacity demand and an error tolerance value and selects an optimum operating mode of the plurality of compressors based on the comparisons and the estimated power consumption for each operating configuration, the optimum operating mode being selected from a group of operating configurations having the ...

MEASURED VALUE STANDARDIZATION

A method is provided for controlling and/or monitoring a compressor system comprising several components, namely one or more compressors, one or more peripheral devices, and also a control/monitoring unit, wherein the compressors and peripheral devices are arranged or connected in a certain configuration. The method distinguishes itself in that (a) in a measured-value-capture step, measured values are captured within the compressor system or the components; (b) in an allocation step, context information is allocated to the measured value or measured values in advance, simultaneously, or after the measured-value capture, in order to standardize the measured values; and (c) in an evaluation step, the measured value or measured values standardized by the context information are used in a control, monitoring, diagnostics, or evaluation routine. 116-. (canceled)17. A method for controlling and/or monitoring a compressor system comprising several components including at least one compressor , at least one peripheral device , and a control/monitoring unit , wherein the at least one compressor and the at least one peripheral device are arranged or connected in a certain configuration , the method comprising steps of:(a) capturing measured values within the compressor system or the components in a measured-value-capture step;(b) allocating context information to the measured values in an allocation step in advance, simultaneously, or after the measured-value capture step to standardize the measured values; and(c) taking the measured values or the measured values standardized by the context information into account in a utilization step in a control, monitoring, diagnostics, or evaluation routine.18. The method according to claim 17 , wherein the measured-value-capture step comprises direct capture of a measured value by measurement and/or the use of stored measured values.19. The method according to claim 18 , wherein claim 18 , in the measured-value capture step claim 18 , ...

Compressor Assembly With Liquid Sensor

A compressor may include a shell, a compression mechanism, first and second temperature sensors, and a control module. The shell may define a lubricant sump. The compression mechanism may be disposed within the shell and may be operable to compress a working fluid. The first temperature sensor may be at least partially disposed within the shell at a first position. The second temperature sensor may be at least partially disposed within the shell at a second position that is vertically higher than the first position. The control module may be in communication with the first and second temperature sensors and the pressure sensor and may determine whether a liquid level in the lubricant sump is below a predetermined level based on data received from the first and second temperature sensors. 1. A compressor comprising:a shell defining a chamber;a compression mechanism disposed within the chamber and operable to compress a working fluid; anda sensor assembly including a first sensor, a second sensor, and a sensor housing, the first and second sensors are disposed at least partially inside of the chamber and are supported by the sensor housing, the sensor housing is mounted to the shell and is at least partially disposed outside of the shell.2. The compressor of claim 1 , wherein the sensor housing includes a hub claim 1 , a conduit claim 1 , a first casing and a second casing claim 1 , the hub sealingly engaging the shell claim 1 , the conduit extending radially inward into the compressor from the hub and receiving wires connected to the first and second sensors claim 1 , the first casing extending axially upward from the conduit and receiving one of the first and second sensors claim 1 , the second casing extending axially downward from the conduit and receiving the other of the first and second sensors.3. The compressor of claim 2 , wherein the first and second casings are axially misaligned with each other.4. The compressor of claim 3 , wherein the first casing ...

SCROLL-TYPE COMPRESSOR

A scroll-type compressor includes a compression-chamber-forming member, a housing, an injection passage part, and a relief mechanism. The compression-chamber-forming member forms a compression chamber and has a movable scroll and a fixed scroll. The housing forms a back pressure chamber. Refrigerant to apply back pressure to the compression-chamber-forming member is accumulated in the back pressure chamber. The injection passage part is linked to the compression chamber. The relief mechanism is configured to establish a communication between the compression chamber and the back pressure chamber communicating when injection pressure of the refrigerant flowing from the injection passage part into the compression chamber is higher than the pressure in the back pressure chamber. 1. A scroll-type compressor , comprising:a fixed scroll;a movable scroll coupled with the fixed scroll to form a compression chamber;a housing forming a back pressure chamber, refrigerant for applying back pressure to the movable scroll being accumulated in the back pressure chamber;an injection passage part provided to the fixed scroll, the injection passage part being configured to establish a communication between an external injection pipe and the compression chamber; anda relief mechanism provided to the fixed scroll, the relief mechanism being configured to establish a communication between the compression chamber and the back pressure chamber when injection pressure, which is the pressure of the refrigerant flowing from the injection passage part into the compression chamber, is higher than the pressure in the back pressure chamber.2. A scroll-type compressor , comprising:a compression-chamber-forming member forming a compression chamber, the compression-chamber-forming member having a movable scroll and a fixed scroll;a housing forming a back pressure chamber, refrigerant for applying back pressure to the compression-chamber-forming member being accumulated in the back pressure chamber; ...

PUMP SYSTEM INCLUDING A CONTROLLER

A method of controlling a liquid ring pump in a pump system includes monitoring a vacuum pressure of the liquid ring pump using a pressure transmitter configured to transmit a vacuum pressure signal to a controller in operative communication with the liquid ring pump. The method also includes maintaining a predetermined vacuum pressure in the liquid ring pump under variable vacuum flow demand within the pump system in response to the vacuum pressure signal by controlling, via instructions from the controller, a parameter of the liquid ring pump based on a comparison of the vacuum pressure signal to the predetermined vacuum pressure by the controller. 1. A method of controlling a liquid ring pump in a pump system , the method comprising:monitoring a vacuum pressure of the liquid ring pump using a pressure transmitter configured to transmit a vacuum pressure signal to a controller in operative communication with the liquid ring pump;maintaining a predetermined vacuum pressure in the liquid ring pump under variable vacuum flow demand within the pump system in response to the vacuum pressure signal by controlling, via instructions from the controller, a parameter of the liquid ring pump based on a comparison of the vacuum pressure signal to the predetermined vacuum pressure by the controller.2. The method of claim 1 , wherein maintaining the predetermined vacuum pressure includes controlling a motor coupled to and configured to drive the liquid ring pump at different speeds based on the comparison of the vacuum pressure signal to the predetermined vacuum pressure by the controller claim 1 , the motor being communicatively coupled and responsive to instructions from the controller.3. The method of claim 2 , further comprising determining a rotational speed of the motor associated with maintaining the predetermined vacuum pressure based on the monitored vacuum pressure claim 2 , and adjusting the rotational speed of the motor to match the determined rotational speed.4. ...

DEGRADATION DIAGNOSTIC DEVICE AND AIR-CONDITIONING APPARATUS

Provided is a degradation diagnostic device, which is configured to perform a diagnosis for degradation of a compressor including a compression mechanism unit to be driven along with a rotational motion of a rotary shaft, and a shell, which is configured to form an outer casing. The degradation diagnostic device includes a vibration detection device to be fixed onto an outer wall of the shell at a position at which the compression mechanism unit is located. The vibration detection device includes: a vibration sensor, which is configured to detect vibration of the compressor; a sensor holding unit including the vibration sensor; a base portion to which the sensor holding unit is connected; and a plurality of projecting portions, which are formed on a surface of the base portion on a side opposite to the sensor holding unit and to be brought into contact with the outer wall. 1. A degradation diagnostic device configured to perform a diagnosis for degradation of a compressor comprising a compression mechanism unit to be driven along with a rotational motion of a rotary shaft and a shell forming an outer casing , the degradation diagnostic device comprising a vibration detection device to be fixed onto an outer wall of the shell at a position at which the compression mechanism unit is located , a vibration sensor configured to detect vibration of the compressor;', 'a sensor holding unit including the vibration sensor;', 'a base portion to which the sensor holding unit is connected; and', 'a plurality of projecting portions formed on a surface of the base portion on a side opposite to the sensor holding unit,', 'the plurality of projecting portions each have distal end portions which are held in contact with the outer wall of the shell along with an axial direction of the rotary shaft., 'wherein the vibration detection device includes2. (canceled)3. The degradation diagnostic device of claim 1 ,wherein the plurality of projecting portions comprise two projecting portions ...

METHOD OF CONTROLLING ELECTRIC COMPRESSOR

A method of controlling an electric compressor, includes aligning a position of a rotor after an electric compressor is powered on; determining whether a refrigerant is in a liquid phase or in a gas phase; preheating the refrigerant by applying power to the electric compressor according to the phase of the refrigerant; and controlling the electric compressor wherein the electric compressor is operated after the refrigerant is preheated. 1. A method of controlling an electric compressor , comprising:aligning a position of a rotor after an electric compressor is powered on;determining whether a refrigerant is in a liquid phase or in a gas phase;preheating the refrigerant by applying power to the electric compressor according to a phase of the refrigerant; andcontrolling the electric compressor wherein the electric compressor is operated after the refrigerant is preheated.2. The method according to claim 1 , wherein the aligning step further comprises setting positions of operation of the rotor and a stator of the electric compressor by applying DC power to the electric compressor for a predetermined amount of time.3. The method according to claim 1 , wherein the determining step further comprises:detecting a temperature in the electric compressor; anddetecting a pressure in the electric compressor.4. The method according to claim 3 , wherein the determining step further comprises determining enthalpy data based on the temperature and the pressure in the electric compressor.5. The method according to claim 1 , wherein the preheating step further comprises performing a first preheating for differently controlling an intensity and an application time of DC power applied to the electric compressor.6. The method according to claim 5 , wherein the preheating step further comprises performing a second preheating for uniformly controlling the intensity and the application time of the DC power applied to the electric compressor after the first preheating step.7. A method of ...

OPERATION OF A WELLHEAD COMPRESSOR

A method of operating a wellhead compressor includes selecting a plurality of operating points of the wellhead compressor, measuring the tubing pressure at the plurality of operating points of the wellhead compressor and determining an efficiency achieved by the wellhead compressor when operating at each of the operating points based on at least the measured tubing pressure at each of the operating points. A production curve is generated of well pressure as a function of flow rate from a combination of measured data and predicted data. An operating point of the wellhead compressor is selected from the production curve based on at least the efficiency of the wellhead compressor at the selected operating point and the wellhead compressor is operated at the selected operating point. The steps of the method are repeated after operating the wellhead compressor at the selected operating point for a predetermined period of time. 1. A method of operating a wellhead compressor , the compressor being configured to pump fluid from a well at a tubing pressure , the method comprising:selecting a plurality of operating points of the wellhead compressor, wherein the flow rate of fluid pumped by the wellhead compressor varies between the plurality of operating points;measuring the tubing pressure at the plurality of operating points of the wellhead compressor;determining an efficiency achieved by the wellhead compressor when operating at each of the operating points based on at least the measured tubing pressure at each of the operating points;generating a production curve of well pressure as a function of flow rate from a combination of measured data and predicted data,selecting an operating point of the wellhead compressor from the production curve based on at least the efficiency of the wellhead compressor at the selected operating point; andoperating the wellhead compressor at the selected operating point;the method further comprising repeating the steps of the method after ...

CLEARANCE MEASURING SENSOR WITH ABRADABLE ELECTRODE

A capacitive sensor for measuring the clearance between the apex of the vanes of a rotor and the inner surface of an abradable coating covering the inner surface of a turbomachine casing, the clearance measuring capacitive sensor including a first electrode the material of which is abradable so as to get worn upon contacting an apex of a vane, the material of the first electrode having a degree of wear substantially identical to the degree of wear of the material of the abradable coating. 1. A capacitive sensor for measuring a clearance between an apex of vanes of a rotor and an inner surface of an abradable coating covering an inner surface of a turbomachine casing , said clearance measuring capacitive sensor comprising a first electrode made of a material which is abradable so as to get worn upon contacting the apex of a vane , said material of said first electrode having a degree of wear substantially identical to a degree of wear of a material of said abradable coating.2. The clearance measuring capacitive sensor according to claim 1 , wherein the surface of the first electrode for contacting a vane apex is positioned aligned with the inner surface of the abradable coating.3. The clearance measuring capacitive sensor according to wherein the material of the first electrode is graphite.4. The clearance measuring capacitive sensor according to wherein the material of the abradable coating covering the inner surface of the casing is conducting and the material of the first electrode is identical to that of the abradable coating.5. The clearance measuring capacitive sensor according to claim 4 , comprising an electrically insulating peripheral zone separating the first electrode from the abradable coating covering the inner surface of the casing.6. The clearance measuring capacitive sensor according to claim 5 , wherein the material of the electrically insulating peripheral zone is selected so as to get worn upon contacting the apex of the vane.7. The clearance ...

Pump apparatus with remote monitoring function and pump apparatus monitoring system

A pump apparatus and a pump apparatus monitoring system are disclosed. The pump apparatus monitoring system includes a cloud server, a remote electronic device, a near end electronic device and a pump apparatus. The pump apparatus includes a control module and at least one parameter sensor. The parameter sensor is for sensing at least one parameter of the pump apparatus. The control module transmits the at least one parameter to the near end electronic device. The near end electronic device uploads the at least one parameter to the cloud server via a network. The remote electronic device downloads the at least one parameter from the cloud server via the network. Accordingly, staff at the remote end is able to get parameters of the pump apparatus by the remote electronic device, so as to adjust the pump apparatus.

Vacuum pump for vehicle

A vacuum pump for a vehicle includes: a pump housing having an internal cylindrical space, an inlet for receiving oil to be supplied to the space, and an outlet for discharging the oil from the space; a rotor eccentrically rotating in the internal cylindrical space of the pump housing; a vane rotating along the inner side of the internal cylindrical space of the pump housing; and a valve maintaining a pressure in the internal cylindrical space of the pump housing at less than a predetermined level.

METHOD FOR OPERATING A ROLLING PISTON COMPRESSOR

A method of operating a rolling piston rotary compressor includes obtaining an angular position and an angular speed of a rolling piston of the compressor, for example, using a tachometer or shaft encoder or observer. The method further includes obtaining an electromagnetic torque applied by an electric motor that is mechanically coupled to the rolling piston. The method further includes calculating a load torque exerted on the rolling piston based on these obtained values by using a load torque observer model that is formulated using known geometries of the compressor and thermodynamic models for the gas compression process. The operation of the electric motor is then adjusted such that the electromagnetic torque applied by the motor is equivalent to the calculated load torque such that noise and vibrations are minimized. 1. A method for operating a rolling piston compressor , comprising:obtaining an angular position and an angular speed of a rolling piston of the compressor;obtaining an electromagnetic torque applied by an electric motor mechanically coupled to the rolling piston;calculating a load torque exerted on the rolling piston using a load torque observer model based on the angular position of the rolling piston, the angular speed of the rolling piston, and the electromagnetic torque applied by the electric motor; andoperating the electric motor to adjust the electromagnetic torque to be equivalent to the calculated load torque.4. The method of claim 2 , wherein the load torque is used to determine an angular acceleration of the rolling piston.7. The method of claim 1 , wherein obtaining the angular position and the angular speed of a rolling piston comprises:measuring the angular position and the angular speed using a tachometer or an encoder.8. The method of claim 1 , wherein obtaining the electromagnetic torque applied by the electric motor comprises:obtaining the electromagnetic torque based on a measured motor current or a back electromotive force of ...

Improvements in and relating to vacuum conduits

In situations where a vacuum system is suddenly overloaded, there is a risk of mechanical damage being sustained, for example, bearing damage, gear slippage or rotor and/or stator collisions. Sudden overloads can also lead to electrical damage, for example, over-currents or power surges. Therefore a pressure regulating apparatus is provided for use in a vacuum pumping system having an inlet, an outlet and a conduit interposed between, and in fluid communication with, the inlet and the outlet, wherein the cross-sectional area of the conduit is greater than that required to meet the conductance requirements of the inlet and the outlet.

INDUCED HOLLOW SPIRAL DRIVING APPARATUS

An induced hollow screw driving apparatus comprises a shell () shaped like a round pipe and having a central through hole in an axial direction; a motor rotor () is disposed in the through hole of the shell () through two bearings () and has a central through hole in an axial direction; screw rings ( and ) used for driving are disposed on an inner wall of the through hole of the motor rotor (); a drive block () is inserted in the sealed shell () to induce an outer wall () of the rotor (), so as to drive the rotor () to rotate. The screw ring driving manner of the driving apparatus has small friction and noise, and the overall driving efficiency thereof exceeds that of existing driving devices such as a propeller; the driving apparatus further has advantages such as being leakage-free, coupling-free, spark-free, cavitation-free, capable of self-speed regulation, capable of turning, magnetizable and extendable, capable of self-cleaning, maintenance-free, and having a long service life. 161212215631164786. An induced hollow spiral driving apparatus , at least comprising: a shell () shaped like a round pipe , having a central circular hollow through hole in an axial direction and being sealed around the through hole , wherein a motor rotor () has a central circular hollow through hole in an axial direction , spiral rings (. , .) used for driving are disposed on an inner wall of the through hole of the rotor () , a drive block () is inserted in the sealed shell () to induce an outer wall () of the rotor so as to drive the rotor () to rotate , and the motor rotor () is fixed in the central circular hollow through hole of the shell () by two bearings () at an inlet opening () and an outlet opening () of the shell ().22122. The induced hollow spiral driving apparatus of claim 1 , wherein the spiral rings (. claim 1 , .) formed in the apparatus at least comprises: (1) a length (L) thereof is greater than an axial length of the shell; (2) a spacing (D) therebetween is smaller ...

State evaluation system, state evaluation apparatus, and state evaluation method

A state evaluation system includes a sensor, a filter, a signal processor, and an evaluator. The sensor detects elastic waves which are generated from industrial equipment in operation. The filter can pass elastic waves having frequency characteristics based on abrasion which is generated in the industrial equipment. The signal processor extracts a plurality of feature values using the elastic waves passing through the filter. The evaluator evaluates an abnormality of the industrial equipment on the basis of a combination of the extracted plurality of feature values.

COMPRESSOR TEMPERATURE CONTROL SYSTEMS AND METHODS

A system for controlling capacity of a compressor comprises a minimum determination module () selectively increasing a minimum capacity of a compressor when a temperature of the compressor is greater than a first predetermined temperature; and a control module () increasing an actual capacity of the compressor in response to an increase in the minimum capacity. A method for controlling capacity of a compressor is also disclosed. The system and method modulate the capacity of the compressor according to the different temperatures. 1. A compressor capacity control system comprising:a minimum determination module that selectively increases a minimum capacity of a compressor when a temperature of the compressor is greater than a first predetermined temperature; anda control module that increases an actual capacity of the compressor in response to an increase in the minimum capacity.2. The compressor capacity control system of further comprising a capacity command module that sets a capacity command to a greater one of the minimum capacity and a target capacity of the compressor claim 1 ,wherein the control module controls the actual capacity of the compressor based on the capacity command.3. The compressor capacity control system of wherein the minimum determination module sets the minimum capacity to a predetermined maximum capacity of the compressor when the temperature of the compressor is greater than a second predetermined temperature claim 2 ,wherein the second predetermined temperature is greater than the first predetermined temperature.4. The compressor capacity control system of wherein the minimum determination module sets the minimum capacity to a predetermined minimum capacity of the compressor when the temperature of the compressor is less than the first predetermined temperature.5. The compressor capacity control system of further comprising a proportional claim 2 , integral claim 2 , derivative (PID) module that determines an adjustment value based on a ...

Switch Actuation Measurement Circuit For Voltage Converter

A drive includes an inverter power circuit that applies power to an electric motor of a compressor from a direct current (DC) voltage bus. A power factor correction (PFC) circuit outputs power to the DC voltage bus based on input alternating current (AC) power. The PFC circuit includes: (i) a switch having a first terminal, a second terminal, and a control terminal; (ii) a driver that switches the switch between open and closed states based on a control signal; (iii) an inductor that charges and discharges based on switching of the switch; and (iv) a circuit that outputs a signal indicating whether the switch is in the open state or the closed state based on a voltage across the first and second terminals of the switch. 1. A drive , comprising:an inverter power circuit that applies power to an electric motor of a compressor from a direct current (DC) voltage bus; (i) a switch having a first terminal, a second terminal, and a control terminal;', '(ii) a driver that switches the switch between open and closed states based on a control signal;', '(iii) an inductor that charges and discharges based on switching of the switch; and', '(iv) a circuit that outputs a signal indicating whether the switch is in the open state or the closed state based on a voltage across the first and second terminals of the switch; and, 'a power factor correction (PFC) circuit that outputs power to the DC voltage bus based on input alternating current (AC) power, the PFC circuit includinga control module that generates the control signal based on the signal indicating whether the switch is in the open state or the closed state.2. The drive of wherein the control module measures a period between: (a) from the open state to the closed state; and', '(b) from the closed state to the open state; and, '(i) a first time when the control signal transitions from a first state for transitioning the switch one of (a) the switch transitioned from the open state to the closed state; and', '(b) the switch ...

Switch Actuation Measurement Circuit for Voltage Converter

A drive includes an inverter power circuit that applies power to an electric motor of a compressor from a direct current (DC) voltage bus. A power factor correction (PFC) circuit outputs power to the DC voltage bus based on input alternating current (AC) power. The PFC circuit includes: (i) a switch having a first terminal, a second terminal, and a control terminal; (ii) a driver that switches the switch between open and closed states based on a control signal; (iii) an inductor that charges and discharges based on switching of the switch; and (iv) a circuit that outputs a signal indicating whether the switch is in the open state or the closed state based on a voltage across the first and second terminals of the switch. 1. A drive , comprising:an inverter power circuit that applies power to an electric motor of a compressor from a direct current (DC) voltage bus; (i) a switch having a first terminal, a second terminal, and a control terminal;', '(ii) a driver that switches the switch between open and closed states based on a control signal;', '(iii) an inductor that charges and discharges based on switching of the switch; and', '(iv) a circuit that outputs a signal indicating whether the switch is in the open state or the closed state based on a voltage across the first and second terminals of the switch., 'a power factor correction (PFC) circuit that outputs power to the DC voltage bus based on input alternating current (AC) power, the PFC circuit including2. The drive of further comprising a control module that generates the control signal based on the signal indicating whether the switch is in the open state or the closed state.3. The drive of wherein the control module measures a period between: (a) from the open state to the closed state; and', '(b) from the closed state to the open state; and, '(i) a first time when the control signal transitions from a first state for transitioning the switch one of (a) the switch transitioned from the open state to the ...

METHOD AND APPARATUS FOR PRESSURE EQUALIZATION IN ROTARY COMPRESSORS

A rotary compressor system includes a compressor housing that includes a compressor motor that draws in fluid from a suction side. The fluid is compressed within a compression chamber and discharged through a discharge side. The compression chamber is disposed between the suction side and the discharge side. An overload-protection switch is electrically coupled in series with the compressor motor and is adapted to cut power to the compressor motor responsive to an overload event. A solenoid valve is fluidly coupled between the compression chamber and a location upstream of the suction side and is electrically coupled in series with the overload-protection switch. An interruption of electrical current to the compressor motor also interrupts electrical current to the solenoid valve, which opens the solenoid valve to equalize pressure between the suction side and the discharge side. 1. A rotary compressor system comprising: a compressor motor;', 'a suction side;', 'a discharge side;', 'a compression chamber disposed between the suction side and the discharge side; and', 'an overload-protection switch electrically coupled in series with the compressor motor and adapted to cut power to the compressor motor responsive to an overload event;, 'a compressor housing comprisinga solenoid valve comprising a valve fluidly coupled between the compression chamber and a location upstream of the suction side and a drive coil electrically coupled in series with the overload-protection switch; andwherein interruption of electrical current to the compressor motor interrupts electrical current to the drive coil thereby opening the valve to equalize pressure between the suction side and the discharge side.2. The rotary compressor system of claim 1 , further comprising:a capacitor electrically coupled between a power source and a terminal of the compressor motor; andwherein the drive coil is wired in parallel with the capacitor.3. The rotary compressor system of claim 1 , further ...

Compressor Having Oil-Level Sensing System

A compressor includes a shell, a first temperature sensor, a second temperature sensor, and a control module. The shell includes a motor, a compression mechanism and a lubricant sump. The first temperature sensor is at least partially disposed within the shell and configured to measure a first temperature of a lubricant at a first position. The second temperature sensor is at least partially disposed within the shell and configured to measure a second temperature of the lubricant at a second position that is vertically higher than the first position. The control module is in communication with the first and second temperature sensors and configured to determine a first difference between the first temperature and the second temperature. The control module is configured to determine whether a liquid level of the lubricant in the lubricant sump is below a predetermined level based on the first difference. 1. A compressor comprising:a shell including a motor, a compression mechanism and a lubricant sump;a first temperature sensor at least partially disposed within said lubricant sump and configured to measure a first temperature of a lubricant at a first position;a second temperature sensor at least partially disposed within said lubricant sump and configured to measure a second temperature of said lubricant at a second position that is vertically higher than said first position; anda control module in communication with said first and second temperature sensors, said control module configured to determine a first difference between the first temperature and the second temperature, said control module configured to determine whether a liquid level of said lubricant in said lubricant sump is below a predetermined level based on said first difference.2. The compressor of claim 1 , wherein a vertical height of said second position is equal to a vertical height of said predetermined level.3. The compressor of claim 1 , wherein said predetermined level equals a minimum ...