CN210486151U

CN210486151U - Quasi-two-stage compression refrigeration system of ejector with defrosting function

Info

Publication number: CN210486151U
Application number: CN201921160612.1U
Authority: CN
Inventors: 臧润清; 周会芳
Original assignee: Tianjin University of Commerce
Current assignee: Tianjin University of Commerce
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-05-08
Anticipated expiration: 2029-07-23

Abstract

The utility model discloses a take accurate doublestage compression refrigerating system of sprayer of defrosting function. The outlet of the compressor of the utility model is connected with a condenser, a heat regenerator, a first electromagnetic valve, a first thermostatic expansion valve, a first evaporator, a second electromagnetic valve, an ejector, a gas-liquid separator, a second thermostatic expansion valve and a second evaporator in sequence through pipelines, and the gas-liquid separator is connected with a third electromagnetic valve, a heat regenerator and an inlet of the compressor in sequence; the defrosting system comprises a compressor, a condenser, a heat regenerator, a fourth electromagnetic valve, a first evaporator, a second evaporator, a fifth electromagnetic valve, a third thermostatic expansion valve and a sixth electromagnetic valve; the outlet of the heat regenerator is sequentially connected with a fourth electromagnetic valve, a second evaporator, a fifth electromagnetic valve, a third thermostatic expansion valve, a first evaporator and a first electromagnetic valve through pipelines. The utility model discloses need not extra defrosting heat source, saved the energy, the cost is reduced.

Description

Quasi-two-stage compression refrigeration system of ejector with defrosting function

Technical Field

The utility model relates to a low temperature refrigeration, freezing cold-stored field, more specifically say, relate to a high-efficient integrated system of accurate second grade system of sprayer and refrigerant defrost system.

Background

The ejector utilizes the high-pressure fluid coming out of the first evaporator as power to eject the refrigerating working medium at the outlet of the second evaporator, the pressure of the refrigerating working medium is increased, the refrigerating working medium is sent into the gas-liquid separator and then returns to the compressor, the pressure ratio is reduced, the system can refrigerate at two evaporation temperatures at the same time, and if the system is used in a freezing and refrigerating technology, the freshness and the freezing of food can be simultaneously realized; the heat exchange performance of the evaporator affects the efficiency of the whole system, the evaporator is easy to frost at a lower temperature, and the electric heating defrosting refers to that the tubes are heated by external tubes heated by external resistance wires. The method has the advantages of quick defrosting, simple pipeline design, easy realization of automatic control and the like, but has larger total power consumption, so that the temperature rise of the system is higher. Hot gas defrost heats evenly and defrosts quickly, but the refrigerant must be stored in the liquid reservoir for a long period of time, optimum utilization of the subcooling process is not achieved, and the compressor is susceptible to wet compression. Brine defrosting is a fast, low cost defrosting technique, however, draining water in time increases the secondary frost rate.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a refrigerate and improve the accurate doublestage compression refrigerating system of ejector of taking defrosting function of system's defrosting performance under two evaporating temperature.

In order to achieve the above purpose, the utility model adopts the following technical means:

an ejector quasi-two-stage compression refrigeration system with a defrosting function comprises a refrigeration system and a defrosting system;

the refrigerating system comprises a compressor 1, a condenser 2, a heat regenerator 3, a first electromagnetic valve 4, a first thermostatic expansion valve 5, a first evaporator 6, a second electromagnetic valve 7, an ejector 8, a gas-liquid separator 9, a second thermostatic expansion valve 10, a second evaporator 11 and a third electromagnetic valve 12; the outlet of the compressor is sequentially connected with a condenser 2, a heat regenerator 3, a first electromagnetic valve 4, a first thermostatic expansion valve 5, a first evaporator 6, a second electromagnetic valve 7, an ejector 8, a gas-liquid separator 9, a second thermostatic expansion valve 10 and a second evaporator 11 through pipelines, and the gas-liquid separator is sequentially connected with a third electromagnetic valve 12, the heat regenerator and the inlet of the compressor; the defrosting system comprises a compressor 1, a condenser 2, a heat regenerator 3, a fourth electromagnetic valve 13, a first evaporator 6, a second evaporator 11, a fifth electromagnetic valve 14, a third thermostatic expansion valve 15 and a sixth electromagnetic valve 16; an outlet of the heat regenerator 3 is sequentially connected with a fourth electromagnetic valve 13, a second evaporator 11, a fifth electromagnetic valve 14, a third thermostatic expansion valve 15, a first evaporator 6 and a first electromagnetic valve 16 through pipelines.

The utility model has the advantages that:

1. the use of the ejector reduces the compression ratio and the throttling loss, so that the system can refrigerate at two different evaporation temperatures.

2. When the system is defrosting, the refrigerant system is supercooled when the frost layer is melted, the cold energy of the frost layer is recovered by the refrigerant, and the system running performance during defrosting is improved.

3. And an additional defrosting heat source is not needed, so that the energy is saved, and the cost is reduced.

Drawings

Fig. 1 is a schematic diagram of an ejector quasi-two-stage compression refrigeration system with a defrosting function.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description.

An ejector quasi-two-stage compression refrigeration system with a defrosting function is disclosed, referring to fig. 1, under a refrigeration mode, a four electromagnetic valve 13, a five electromagnetic valve 14 and a six electromagnetic valve 16 are closed, the rest valves are all opened, a refrigerant enters a condenser for condensation and then enters a heat regenerator, enters a first evaporator 6 through a first electromagnetic valve 4 and a first thermal expansion valve 5, is still in a two-phase region after absorbing heat, enters an ejector 8 after passing through a second electromagnetic valve 7, the section of the two-phase fluid is suddenly reduced, the speed is increased, the pressure is reduced, the two-phase fluid enters a mixing region and is mixed with fluid of a second evaporator 11, then enters a pressure expansion region, then enters a gas-liquid separator 9, the gas obtains a certain superheat degree through a heat regenerator 3, returns to the compressor through a third electromagnetic valve 12, the liquid firstly releases heat to the gas in the gas-liquid separator to, the heat is throttled to a lower evaporation temperature through a second thermostatic expansion valve 10, reaches a second evaporator 11, absorbs heat at the lower evaporation temperature and then enters an ejector;

in a defrosting mode, the four electromagnetic valves 13, the five electromagnetic valves 14 and the six electromagnetic valves 16 are opened, the rest valves are closed, the evaporator II is defrosted, high-temperature high-pressure liquid from the heat regenerator is introduced into the evaporator II 11 through the four electromagnetic valves 13, frost layers melt and absorb heat, a refrigerant obtains a larger supercooling degree, the refrigerant is throttled and reduced to an evaporation temperature required to be reached by the evaporator I through the five electromagnetic valves 14 and the three thermal expansion valve 15, the heat is absorbed by the evaporator I6, and the refrigerant enters the heat regenerator through the six electromagnetic valves 16 to obtain superheat degree and then enters the compressor.

While the present invention has been described above with reference to the accompanying drawings, it is not limited to the above specific embodiments, which are illustrative only and not restrictive. The change under the flow of the utility model is within the protection of the utility model.

Claims

1. An ejector quasi-two-stage compression refrigeration system with a defrosting function is characterized by comprising a refrigeration system and a defrosting system;

the refrigeration system comprises a compressor (1), a condenser (2), a heat regenerator (3), a first electromagnetic valve (4), a first thermostatic expansion valve (5), a first evaporator (6), a second electromagnetic valve (7), an ejector (8), a gas-liquid separator (9), a second thermostatic expansion valve (10), a second evaporator (11) and a third electromagnetic valve (12); the outlet of the compressor is sequentially connected with a condenser (2), a heat regenerator (3), a first electromagnetic valve (4), a first thermostatic expansion valve (5), a first evaporator (6), a second electromagnetic valve (7), an ejector (8), a gas-liquid separator (9), a second thermostatic expansion valve (10) and a second evaporator (11) through pipelines, and the gas-liquid separator is sequentially connected with a third electromagnetic valve (12), the heat regenerator and the inlet of the compressor;

the defrosting system comprises a compressor (1), a condenser (2), a heat regenerator (3), a fourth electromagnetic valve (13), a first evaporator (6), a second evaporator (11), a fifth electromagnetic valve (14), a third thermostatic expansion valve (15) and a sixth electromagnetic valve (16); the outlet of the heat regenerator (3) is sequentially connected with a fourth solenoid valve (13), a second evaporator (11), a fifth solenoid valve (14), a third thermostatic expansion valve (15), a first evaporator (6) and a sixth solenoid valve (16) through pipelines.