Worm type water-cooled cold water chiller and control method

The invention discloses a worm type water-cooled cold water chiller and a control method. The worm type water-cooled cold water chiller is composed of a chassis, a compressor, a condenser, an electronic expansion valve, a drying filter, an evaporator, an electric cabinet, refrigeration accessories and connecting pipelines which are arranged on the chassis. The method adopts current control, a mutual inductor is arranged between a main power supply and the compressor for acquiring current data, a control module is arranged between the mutual inductor and the compressor, the mutual inductor acquires the current value output from the main power supply to the compressor in real time when the compressor operates and then transfers the acquired current value to the control module, the control module compares the current measured value acquired by the mutual inductor with a theoretic value and outputs a load increase/decrease signal to the compressor based on the comparing result so as to adjust ...

Liquid level control system for conticaster mould

The present invention discloses a liquid-level control system for crystallizer of conticaster. Said invented system includes crystallizer, support, liquid-level sensor, driver, controller, digital electric cylinder, stopper mechanism, press bar and hand-held controller. The above-mentioned devices are formed into a closed loop system by using digital signal and by means of control system to traceand control the change of liquid level accurately at all times. Said invented system adopts digital control technique, has no hydraulic and clutch mechanism, so that it is simple and reliable in structure, rapid in response rate, high in control accuracy, low in cost and energy consumption and safe in use.

Fluid cylinder with digital or analog signal output

A fluid cylinder with digital or analog signal output for different fluid systems is composed of cylinder body, piston rod, long-guide internal-feedback torsional helicoid, feedback nut, connecting rod, and digital or analog signal generator. Said signal generator may be pulse generator, absolute position encoder, multi-turn potentiometer and rotary transformer. Its advantages are long stroke andlow cost.

Long-life hydraulic energy accumulator with float valve

A long-life hydraulic energy accumulator with a float valve is composed of sealed steel barrel, hollow float, flexible chain, small ball of sealing valve, tube, end cover, connector, conic perforatedseat and aerating small hole. Said hollow float can bring the small ball of sealing valve to raise up or drop down for performing energy accumulation, isolating gas from liquid, and preventing gas from coming into pipeline. Its advantages are no friction and element damage, and long service life.

Digital fluid cylinder with self-feedback of torsional helicoid

A long-lead digital fluid cylinder with self-feedback of torsional helicoid is composed of cylinder body, piston rod, long-lead self-feedback torsional helicoid, feedback nut, valve core with spiral thread at end part and sealing shoulder in central part, connecting slide sleeve and step motor. A mechanical closed-loop position control is formed. Its advantages are high speed, long strike and lowcost.

Distributive air conditioner oil return method

The invention relates to a distributive air conditioner oil return method. When two or more than two compressors run at the same time, refrigeration oil separated by an oil separator is respectively transferred to an oil inlet pipe through a distributor and then enters the compressors through an air intake pipe. When some compressors run and others stop, because the air intake pipe is arranged vertically, the oil entering the compressors which are in the halted state returns to the distributor under the action of gravity and then enters the compressors which are in the running state. The invention can improve the work efficiency and ensure the safe running of the compressors.

Central air-conditioning controller

The invention relates to a central air-conditioning controller, which comprises a main processor, a dial switch and key circuit, a 485 communication bus, a display circuit, a reset circuit, a rectifier switch power supply, an on-line upgrading circuit, a simulative serial port circuit, an electronic expansion valve drive circuit, a temperature and pressure acquisition circuit, a fault feedback circuit and a PWM and relay input circuit. The type of the main processor is MB96F356. The dial switch and key circuit, the 485 communication bus, the display circuit, the reset circuit, the rectifier switch power supply, the on-line upgrading circuit, the simulative serial port circuit, the electronic expansion valve drive circuit, the temperature and pressure acquisition circuit, the fault feedback circuit and the PWM and relay input circuit are all connected with the main processor. The central air-conditioning controller has the characteristics of multifunction, high efficiency and intellectualization ...

Main cable reversing method and structure for cable crane

The invention discloses a main cable reversing method and a main cable reversing structure for a cable crane. Partial main cables in a plurality of main cables parallelly bearing loads move round a cable saddle on a tower top, change the direction through an anchor on one side, and are anchored with the tower top reversely, so that the main cables are reversed. By the method, wind cables are reduced, equipment usage and part cost are reduced, the erection construction of the wind cables is reduced, and the construction cost is reduced; and unbalanced horizontal force on the tower top and cable tower deviation are reduced, the number of the wind cables is reduced, the erection process is simplified, and the crane stress is facilitated.

Digitalized electric cylinder with inner guide unit

A digitalized electric cylinder with inner antirotating guide device is composed of cylinder body, piston rod, guide key and key slot, globoid screw, thrust bearing, connecting slide sleeve and step motor. Mechanical closed-loop position control is formed to replace low-power servo oil cylinder or gas cylinder. Its advantages are moderate powder, high precisioon, high speed and low cost. It can be used in open-loop or closed-loop autocontrol system with the power lower than thousands kilogram.

DIGITAL PULSE-VALVE SYSTEM

Method for forecasting stability of soil slope under condition of raining

The invention discloses a method for forecasting the stability of a soil slope under condition of raining, comprising the steps of: firstly, setting up a composite table of soil slope stability control factors (Table 1) by means of eleven parameters; secondly, setting up a flood-resistant capability grading table of each control factor (Table 2) by mathematical regression analysis of the soil slope stability control factors; thirdly, obtaining the threshold value of effective rainfall by statistically analyzing a relationship between regional landslide and rainfall; and finally, setting up a stability warning level table (Table 3) according to the flood-resistant capability grading table (Table 2) and the regularity and the characteristic of the rainfall, and forecasting the stability state of some soil slope according to the stability warning level table (Table 3) under the condition of raining.

Digital-type electronically controlled valve

A digital-type electronically controlled valve with step motor and speed reducer, including angular stroke type and straight stroke type, is composed of main body, connecting frame, speed-reducing mechanism, step motor, handwheel, electronic valve position indicator, mechanical indicator for valve's open condition and screw lifter. It can directly receive digital pulse signals from computer, so having simplified control and higher response speed and control precision.

Heat pump water heater

The invention relates to a heat pump water heater which comprises a chassis, a compressor arranged on the chassis, an extension-type water heat exchanger, a finned heat exchanger, a gas-liquid separator, a four-way valve and a water pipe, wherein the water pipe comprises a water replenishing pipe, a water inlet pipe, a water outlet pipe and a drain pipe; the water replenishing pipe is provided with a pressure switch for measuring water pressure, the water inlet pipe is provided with a water system one-way valve, a temperature sensor for sensing water temperature and a warm water valve which is connected with the temperature sensor and used for controlling water yield are arranged on the water outlet pipe. As improvement are carried out on various parts, compared with the prior art, the heat pump water heater make tremendous improvements in terms of use, performance and function, thus being capable of meeting use demands of clients.

Nano aqueous natural real stone powder latex paint

The present invention relates to an emulsion paint, in particular, it is a nano water natural true stone emulsion paint. Its composition includes (by weight portion) 4-15 portions of SiO2 whose grain size is 10-40 nm, 6-20 portions of TiO2 whose grain size is 10-40 nano, 320-380 portions of white and/or colour natural stone powder whose grain size is 20-50 micrometers, 250-550 portions of modified acrylic emulsion, 100-300 portions of water, 1-9 portions of dispersing agent, 1-5 portions of moistening agent, 2-55 portions of film-forming adjuvant, 0.1-0.5 portion of preservative and 1-1.5 portions of rheological property improving agent.

PORTABLE DRAWING MACHINE WITH MULTIPLE FUNCTIONS

Liquid-level control system of mould of continuous casting machine

一种带扭转螺旋体内反馈的数字流体缸

... 本发明公开了一种带扭转螺旋体内反馈的大导程数字流体缸。它包括缸体(1)、活塞杆(2)、大导程内反馈扭转螺旋体(3)、反馈螺母(4)、头部带螺纹中间带密封台肩的阀芯(7)、连接滑套(10)和步进电机(11)等，通过有机的联结构成机械闭环位置控制。由于螺旋体制造简单、导程大，因而可制造出高速度、长行程、低价位的工业用数字流体缸。可广泛用于各种流体系统中。 ...

Central air-conditioning controller

The invention relates to a central air-conditioning controller, which comprises a main processor, a dial switch and key circuit, a 485 communication bus, a display circuit, a reset circuit, a rectifier switch power supply, an on-line upgrading circuit, a simulative serial port circuit, an electronic expansion valve drive circuit, a temperature and pressure acquisition circuit, a fault feedback circuit and a PWM and relay input circuit. The type of the main processor is MB96F356. The dial switch and key circuit, the 485 communication bus, the display circuit, the reset circuit, the rectifier switch power supply, the on-line upgrading circuit, the simulative serial port circuit, the electronic expansion valve drive circuit, the temperature and pressure acquisition circuit, the fault feedback circuit and the PWM and relay input circuit are all connected with the main processor. The central air-conditioning controller has the characteristics of multifunction, high efficiency and intellectualization ...