Refrigerating system with economizer

Abstract

The utility model provides a refrigerating system with an economizer, which is characterized in that an outlet of an evaporator is connected with an inlet of a first channel of a heat regenerator, an outlet of the first channel of the heat regenerator is connected with an inlet of a compressor, an outlet of the compressor is connected with an inlet of an oil separator, and an outlet of the oil separator is connected with an inlet of a condenser; an outlet of the condenser is connected with an inlet of the drying filter, an outlet of the drying filter is simultaneously connected with an inlet of a first channel of the economizer and an inlet of the liquid spraying capillary tube, an outlet of the first channel of the economizer is connected with an inlet of the first electronic expansion valve, and an outlet of the first electronic expansion valve is connected with an inlet of a second channel of the heat regenerator. An outlet of the regenerator second channel is connected with an inlet of the evaporator; an outlet of the liquid spraying capillary tube is connected with an inlet of the economizer second channel, and an outlet of the economizer second channel is connected with an inlet of the compressor. The refrigerating system with the economizer has the advantages of high efficiency, good stability and low noise, and can meet the requirements of a high-precision temperature control system.

Description

Technical Field

[0001] The utility model relates to a refrigeration system, in particular to a refrigeration system with an economizer. Background Art

[0002] A refrigeration system is a system that uses external energy to transfer heat from a substance (or environment) with a higher temperature to a substance (or environment) with a lower temperature. When processing some high-performance and high-reliability parts, a constant temperature cooling system is required to cool the parts to ensure the quality of the parts processing. In some special production processes such as testing, precision material testing, and precision instrument cooling water systems, it is necessary to ensure that the circulating cooling water inlet is kept at a constant temperature or with high precision so that the data or product performance is stable. The existing refrigeration system has a low temperature control accuracy and cannot meet the system requirements for high-precision temperature control. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a refrigeration system with an economizer. The utility model recovers the waste heat in the exhaust pressure and condensation temperature of the refrigeration system through the economizer, thereby improving the energy efficiency ratio of the system. Compared with the traditional screw compression refrigeration system, its energy efficiency is improved by about 10%-20%; the refrigeration system with an economizer of the utility model has high stability and can maintain a stable operating state under changing working conditions. Under different loads, the system can be adaptively adjusted, which improves the efficiency and stability of the system and can also reduce the noise and vibration generated when the system is working.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the embodiment of the utility model is:

[0005] A refrigeration system with an economizer, comprising an evaporator, a regenerator, a compressor, an oil separator, a condenser, a filter drier and an economizer, wherein the outlet of the evaporator is connected to the inlet of the first channel of the regenerator, the outlet of the first channel of the regenerator is connected to the inlet of the compressor, the outlet of the compressor is connected to the inlet of the oil separator, the outlet of the oil separator is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the filter drier, the outlet of the filter drier is simultaneously connected to the inlet of the first channel of the economizer and the inlet of a liquid spray capillary, the outlet of the first channel of the economizer is connected to the inlet of a first electronic expansion valve, the outlet of the first electronic expansion valve is connected to the inlet of the second channel of the regenerator, and the outlet of the second channel of the regenerator is connected to the inlet of the evaporator;

[0006] The outlet of the liquid injection capillary is connected to the inlet of the second channel of the economizer, and the outlet of the second channel of the economizer is connected to the inlet of the compressor.

[0007] Furthermore, a second electronic expansion valve is provided between the outlet end of the oil separator and the inlet of the second channel of the regenerator.

[0008] Furthermore, a return pipeline is provided between the outlet end of the oil separator and the inlet end of the compressor.

[0009] Furthermore, a first pressure sensor for detecting suction pressure is disposed at the outlet end of the evaporator, and a second pressure sensor for detecting exhaust pressure is disposed at the outlet end of the compressor.

[0010] Furthermore, a first temperature sensor for detecting the intake temperature is provided at the inlet end of the compressor, and a second temperature sensor for detecting the exhaust temperature is provided between the outlet end of the compressor and the inlet end of the oil separator.

[0011] The beneficial effects of the technical solution provided by the embodiment of the utility model are:

[0012] The utility model recovers waste heat in the exhaust pressure and condensing temperature of the refrigeration system through the economizer, thereby improving the energy efficiency ratio of the system. Compared with the traditional screw compression refrigeration system, its energy efficiency is improved by about 10%-20%; the refrigeration system with economizer of the utility model is highly stable and can maintain a stable operating state under changing working conditions. Under different loads, the system can be adaptively adjusted, which improves the efficiency and stability of the system and can also reduce the noise and vibration generated when the system is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the planar distribution structure of a refrigeration system with an economizer in an embodiment of the utility model.

[0014] Explanation of the accompanying drawings: 1-evaporator; 2-regenerator; 3-compressor; 4-oil separator; 5-condenser; 6-drying filter; 7-economizer; 8-liquid injection capillary; 9-first electronic expansion valve; 10-second electronic expansion valve; 11-first pressure sensor; 12-second pressure sensor; 13-first temperature sensor; 14-second temperature sensor. DETAILED DESCRIPTION

[0015] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "inside, outside", "up, down", "left, right", etc. are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model. Example 1

[0017] like Figure 1 As shown, a refrigeration system with an economizer comprises an evaporator 1, a regenerator 2, a compressor 3, an oil separator 4, a condenser 5, a filter dryer 6 and an economizer 7, wherein the outlet of the evaporator 1 is connected to the inlet of the first channel of the regenerator 2, the outlet of the first channel of the regenerator 2 is connected to the inlet of the compressor 3, the outlet of the compressor 3 is connected to the inlet of the oil separator 4, the outlet of the oil separator 4 is connected to the inlet of the condenser 5, the outlet of the condenser 5 is connected to the inlet of the filter dryer 6, the outlet of the filter dryer 6 is simultaneously connected to the inlet of the first channel of the economizer 7 and the inlet of the liquid spray capillary 8, the outlet of the first channel of the economizer 7 is connected to the inlet of the first electronic expansion valve 9, the outlet of the first electronic expansion valve 9 is connected to the inlet of the second channel of the regenerator 2, and the outlet of the second channel of the regenerator 2 is connected to the inlet of the evaporator 1;

[0018] The outlet of the liquid injection capillary 8 is connected to the inlet of the second channel of the economizer 7 , and the outlet of the second channel of the economizer 7 is connected to the inlet of the compressor 3 .

[0019] A second electronic expansion valve 10 is provided between the outlet end of the oil separator 4 and the inlet of the second channel of the regenerator 2 , and the second electronic expansion valve 10 is a thermostatic valve.

[0020] A reflux pipeline is provided between the outlet end of the oil separator 4 and the inlet end of the compressor 3. The oil separator 4 separates the lubricating oil in the high-pressure steam discharged from the refrigeration compressor 3 and then returns the high-pressure steam to the compressor 3 again to avoid affecting the refrigeration effect.

[0021] A first pressure sensor 11 for detecting suction pressure is disposed at the outlet end of the evaporator 1 , and a second pressure sensor 12 for detecting exhaust pressure is disposed at the outlet end of the compressor 3 .

[0022] A first temperature sensor 13 for detecting the intake temperature is disposed at the inlet end of the compressor 3 , and a second temperature sensor 14 for detecting the exhaust temperature is disposed between the outlet end of the compressor 3 and the inlet end of the oil separator 4 .

[0023] The refrigeration system of the utility model is provided with an economizer 7 before the drying filter 6 and the first electronic expansion valve 9. A part of the high-pressure liquid refrigerant after the impurities are removed by the drying filter 6 is passed into the first channel of the economizer 7, and the other part enters the second channel of the economizer 7 after being throttled by the liquid spray capillary 8, and heat exchange is performed in the economizer 7. The gaseous refrigerant flows back from the outlet of the second channel of the economizer 7 and enters the compressor 3 for compression. The liquid refrigerant flows out from the outlet of the second channel of the economizer 7, enters the regenerator 2 in the form of low-pressure wet steam for heat exchange after being throttled and reduced in pressure by the first electronic expansion valve 9, and then returns to the evaporator 1. After two heat exchanges in the economizer 7 and the regenerator 2, the refrigeration system has a high stability and can maintain a stable operating state under changing working conditions. Under different loads, the system can be adaptively adjusted, which improves the efficiency and stability of the system and can also reduce the noise and vibration generated when the system is working.

[0024] On the other hand, a second electronic expansion valve 10 is provided between the outlet end of the oil separator 4 and the inlet of the second channel of the regenerator 2. The high-pressure steam coming out of the oil separator 4 enters the regenerator 2 in the form of gas through the second electronic expansion valve 10, and is mixed with the gas-liquid two-phase mixture coming out of the first electronic expansion valve 9 for heat exchange in the regenerator. By adjusting the flow ratio of the two, the temperature can be regulated more accurately to meet the requirements of the high-precision temperature control system.

[0025] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A refrigeration system with an economizer, characterized in that: The invention comprises an evaporator (1), a regenerator (2), a compressor (3), an oil separator (4), a condenser (5), a filter dryer (6) and an economizer (7), wherein the outlet of the evaporator (1) is connected to the inlet of the first channel of the regenerator (2), the outlet of the first channel of the regenerator (2) is connected to the inlet of the compressor (3), the outlet of the compressor (3) is connected to the inlet of the oil separator (4), the outlet of the oil separator (4) is connected to the inlet of the condenser (5), the outlet of the condenser (5) is connected to the inlet of the filter dryer (6), the outlet of the filter dryer (6) is simultaneously connected to the inlet of the first channel of the economizer (7) and the inlet of the liquid injection capillary (8), the outlet of the first channel of the economizer (7) is connected to the inlet of a first electronic expansion valve (9), the outlet of the first electronic expansion valve (9) is connected to the inlet of the second channel of the regenerator (2), and the outlet of the second channel of the regenerator (2) is connected to the inlet of the evaporator (1); The outlet of the liquid injection capillary (8) is connected to the inlet of the second channel of the economizer (7), and the outlet of the second channel of the economizer (7) is connected to the inlet of the compressor (3); A second electronic expansion valve (10) is provided between the outlet end of the oil separator (4) and the inlet of the second channel of the regenerator (2).

2. The refrigeration system with economizer according to claim 1, characterized in that: A return pipeline is provided between the outlet end of the oil separator (4) and the inlet end of the compressor (3).

3. The refrigeration system with economizer according to claim 1 or 2, characterized in that: The outlet end of the evaporator (1) is provided with a first pressure sensor (11) for detecting the suction pressure, and the outlet end of the compressor (3) is provided with a second pressure sensor (12) for detecting the exhaust pressure.

4. The refrigeration system with economizer according to claim 1 or 2, characterized in that: A first temperature sensor (13) for detecting the intake temperature is provided at the inlet end of the compressor (3), and a second temperature sensor (14) for detecting the exhaust temperature is provided between the outlet end of the compressor (3) and the inlet end of the oil separator (4).

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