CN208222896U - A kind of Two-stage Compression cryogenic refrigerating system - Google Patents

Abstract

The utility model discloses a two-stage compression low-temperature refrigeration system, the outlet of the high-pressure refrigeration compressor is connected with the inlet of the condenser, the outlet of the condenser is connected with the high-pressure liquid inlet of the regenerator, and the high-pressure liquid outlet of the regenerator is connected with the main fluid of the ejector The inlet is connected, and the diffuser outlet of the ejector is connected with the two-phase fluid inlet of the gas-liquid separator. The low-pressure fluid outlet of the heater is connected with the inlet of the low-pressure refrigeration compressor; the low-temperature fluid outlet of the intercooler is connected with the low-temperature fluid inlet of the gas-liquid separator; It is connected with the inlet of the evaporator, and the outlet of the evaporator is connected with the injection fluid inlet of the injector. The ejector and the vortex tube of the utility model replace the throttling and pressure-reducing element for expansion and pressure reduction, and can improve the performance of the two-stage refrigeration system.

Description

A Two-Stage Compression Low-Temperature Refrigeration System

technical field

The utility model relates to the technical field of low-temperature refrigeration, in particular to a two-stage compression low-temperature refrigeration system.

Background technique

With the rapid development of society and the urgent update of cold chain logistics, the demand for cryogenic refrigeration systems continues to increase. In a conventional two-stage compression refrigeration system, the subcooling source of the high-temperature liquid in the intercooler is provided by part of the high-temperature and high-pressure liquid that absorbs heat after throttling, and the expansion and pressure-reducing components between the condenser and the evaporator in the refrigeration system, etc., resulting in energy loss.

Utility model content

The purpose of this utility model is to provide a two-stage compression low-temperature refrigeration system to further improve the operation performance of the refrigeration system in view of the technical defects in the prior art.

The technical scheme adopted for realizing the purpose of this utility model is as follows:

A two-stage compression cryogenic refrigeration system comprising:

High-pressure refrigeration compressor, intercooler, low-pressure refrigeration compressor, gas-liquid separator, vortex tube, evaporator, ejector, regenerator, condenser; the outlet of the high-pressure refrigeration compressor is connected to the condenser The inlet is connected, the outlet of the condenser is connected with the high-pressure liquid inlet of the regenerator, the high-pressure liquid outlet of the regenerator is connected with the main fluid inlet of the ejector, and the diffuser outlet of the ejector is connected with the two-phase fluid inlet of the gas-liquid separator , the gas outlet of the gas-liquid separator is divided into two paths, one is connected to the low-pressure fluid inlet of the regenerator, and the other is connected to the low-pressure fluid inlet of the intercooler, and the low-pressure fluid outlet of the regenerator is connected to the inlet of the low-pressure stage refrigeration compressor The low-temperature fluid outlet of the intercooler is connected with the low-temperature fluid inlet of the gas-liquid separator; the liquid outlet of the gas-liquid separator is connected with the liquid inlet of the vortex tube, the cold fluid outlet of the vortex tube is connected with the inlet of the evaporator, and the outlet of the evaporator It is connected with the injection fluid inlet of the ejector; the hot fluid diffuser outlet of the vortex tube is connected in parallel with the low-pressure fluid outlet of the regenerator and then connected with the inlet of the low-pressure refrigeration compressor; the outlet of the low-pressure refrigeration compressor is connected with the high temperature and high pressure of the intercooler The gas inlet is connected, and the high-temperature and high-pressure gas outlet of the intercooler is connected with the inlet of the high-pressure refrigeration compressor.

The utility model uses low-cost, no moving parts, no work-consuming injectors and vortex tubes to replace throttling and pressure-reducing elements to expand and reduce pressure, reducing the cost of the expansion process. The low-temperature gas from gas-liquid separation enters the regenerator to subcool the liquid at the outlet of the condenser, further reduces the enthalpy at the inlet of the evaporator and the flow rate of low-temperature and low-pressure liquid, and enters the intercooler to make the discharge of the low-pressure refrigeration compressor Air cooling reduces the temperature, reduces the pressure ratio of the refrigeration compressor, reduces power consumption, and improves the performance of the two-stage refrigeration system.

Description of drawings

Fig. 1 is a schematic diagram of a two-stage compression low-temperature refrigeration system of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Referring to Fig. 1, a two-stage compression low-temperature refrigeration system includes:

High-pressure refrigeration compressor 1, intercooler 2, low-pressure refrigeration compressor 3, gas-liquid separator 4, vortex tube 5, evaporator 6, ejector 7, regenerator 8, condenser 9;

The outlet of the high-pressure refrigeration compressor 1 is connected to the inlet of the condenser 9, the outlet of the condenser 9 is connected to the high-pressure liquid inlet of the regenerator 8, and the high-pressure liquid outlet of the regenerator 8 is connected to the main fluid inlet of the ejector 7 The diffuser outlet of the ejector 7 is connected to the two-phase fluid inlet of the gas-liquid separator 4, and the gas outlet of the gas-liquid separator 4 is divided into two paths, one path is connected to the low-pressure fluid inlet of the regenerator 8, and the other path is connected to the intermediate cooling The low-pressure fluid inlet of the regenerator 2 is connected, and the low-pressure fluid outlet of the regenerator 8 is connected with the inlet of the low-pressure stage refrigeration compressor 3; the low-temperature fluid outlet of the intercooler 2 is connected with the low-temperature fluid inlet of the gas-liquid separator 4; gas-liquid separation The liquid outlet of the vortex tube 4 is connected to the liquid inlet of the vortex tube 5, and the liquid enters the vortex tube 5 and expands to be divided into cold and hot fluids. The cold fluid outlet of the vortex tube 5 is connected to the inlet of the evaporator 6, and the outlet of the evaporator 6 is connected to the ejector. 7 is connected to the injection fluid inlet; the hot fluid diffuser outlet of the vortex tube 5 is connected in parallel with the low-pressure fluid outlet of the regenerator 8 and then connected to the inlet of the low-pressure refrigeration compressor 3; the outlet of the low-pressure refrigeration compressor 3 is connected to the intercooler 2 The high-temperature and high-pressure gas inlet is connected, and the high-temperature and high-pressure gas outlet of the intercooler 2 is connected with the inlet of the high-pressure refrigeration compressor 1.

Described injector 7 adopts prior art equipment, is made up of nozzle, mixing section and diffuser section, and described vortex tube 5 adopts prior art equipment, is made up of vortex chamber, cold end section, hot end section and diffuser section composition.

When the refrigeration system is running, the high-temperature and high-pressure gas discharged from the high-pressure refrigeration compressor 1 enters the condenser 9 to exchange heat with the cooling medium, and the heat released is condensed into a high-temperature and high-pressure liquid, which enters the regenerator 8, and then enters the jet after further heat release and supercooling. The main fluid inlet of the device 7 is expanded and depressurized, and the low-pressure gas at the outlet of the evaporator 6 is ejected. After mixing, the pressure of the diffuser end increases and enters the gas-liquid separator 4. The separated liquid is separated after being expanded and depressurized by the vortex tube 5. The cold fluid enters the evaporator 6, absorbs heat, and provides a cold source for the cold room. The gas separated by the gas-liquid separator 4, one way is heat-exchanged with the high-pressure liquid in the regenerator 8, and enters the low-pressure stage circulating refrigeration compressor 3 after absorbing heat, and the other way enters the intercooler 2 to be the discharge of the low-pressure stage refrigeration compressor 3. After the gas cools down, it enters the gas-liquid separator 4. After the vortex tube 5 is expanded and decompressed, the hot fluid separated and diffused by the diffuser section enters the low-pressure stage refrigeration compressor 3, and the exhaust gas of the low-pressure stage refrigeration compressor 3 enters the high-pressure stage refrigeration compressor after being cooled by the intercooler 2 Machine 1.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these Improvement and retouching should also be regarded as the protection scope of the present utility model.

Claims (1)

1. a kind of Two-stage Compression cryogenic refrigerating system, characterized in that including hiigh pressure stage refrigeration compressor, intercooler, low pressure Grade refrigeration compressor, gas-liquid separator, vortex tube, evaporator, injector, regenerator, condenser；The hiigh pressure stage refrigerant compression The outlet of machine and the entrance of condenser connect, and the outlet of condenser and the highly pressurised liquid entrance of regenerator connect, the height of regenerator Press liquid outlet is connect with the main fluid entrance of injector, the two-phase fluid entrance of the diffusion outlet and gas-liquid separator of injector Connection, the gas vent of gas-liquid separator is divided into two-way, connect all the way with the low-pressure fluid entrance of regenerator, cold with centre all the way But the low-pressure fluid entrance connection of device, the low pressure fluid output of regenerator are connect with the entrance of low-pressure stage refrigeration compressor；It is intermediate The cryogenic fluid outlet of cooler and the cry-fluid inlet of gas-liquid separator connect；The liquid outlet and vortex of gas-liquid separator The liquid inlet of pipe connects, and the entrance of vortex tube cold fluid outlet and evaporator connects, the outlet of evaporator and drawing for injector The connection of jet body entrance；Vortex tube hot fluid diffusion outlet it is in parallel with regenerator low pressure fluid output after with low-pressure stage refrigerant compression The entrance of machine connects；The outlet of low-pressure stage refrigeration compressor and the high temperature and high pressure gas entrance of intercooler connect, intermediate cold But the high temperature and high pressure gas outlet of device is connect with the entrance of hiigh pressure stage refrigeration compressor.