CN216481664U - Refrigerating system with precooling apparatus - Google Patents
Refrigerating system with precooling apparatus Download PDFInfo
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- CN216481664U CN216481664U CN202120533738.XU CN202120533738U CN216481664U CN 216481664 U CN216481664 U CN 216481664U CN 202120533738 U CN202120533738 U CN 202120533738U CN 216481664 U CN216481664 U CN 216481664U
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Abstract
The utility model belongs to the technical field of refrigeration, and particularly relates to a refrigeration system with a precooling device, which comprises a refrigeration loop, wherein the refrigeration loop comprises an inlet flow path and a return flow path; the inlet flow path is sequentially connected with a compressor, an oil separator, a condenser, a drying filter, a precooling device, a gas-liquid separator, a plate heat exchanger and an evaporator; the evaporator, the plate heat exchanger, the precooling device and the compressor are sequentially connected to the return path; wherein, the two ends of the evaporator are respectively connected with the plate heat exchanger. The beneficial technological effect does in this application: the refrigerating system with the precooling device has the condensing temperature about 20-30 ℃ lower than that of a refrigerating system without the precooling device, so that the efficiency of the refrigerating system is improved.
Description
Technical Field
The utility model belongs to the technical field of refrigeration, and particularly relates to a refrigeration system with a precooling device.
Background
In the prior art, a refrigerating system is not provided with a precooling device, the temperature of a refrigerant condensed by a condenser is about 25-35 ℃, and at the moment, if the refrigerant directly enters a plate heat exchanger, the efficiency of the refrigerating system is low.
SUMMERY OF THE UTILITY MODEL
The utility model provides a refrigerating system with a precooling device, which is simple in structure and high in refrigerating speed.
The technical problem solved by the utility model is realized by adopting the following technical scheme:
a refrigeration system provided with a pre-cooling device comprises a refrigeration loop, wherein the refrigeration loop comprises an inlet flow path and a return flow path;
the inlet flow path is sequentially connected with a compressor, an oil separator, a condenser, a drying filter, a precooling device, a gas-liquid separator, a plate heat exchanger and an evaporator;
the evaporator, the plate heat exchanger, the precooling device and the compressor are sequentially connected to the return path;
the two ends of the evaporator are respectively connected with the plate heat exchanger;
a refrigeration stop valve, a secondary capillary tube and a refrigeration electromagnetic valve are respectively connected between the plate heat exchanger and the evaporator on the inlet flow path;
an air return stop valve is connected between the evaporator and the plate heat exchanger on the return path;
the gas-liquid separator is provided with a gas outlet and a liquid outlet, the liquid outlet is connected with the plate heat exchanger through a liquid outlet pipeline, and the gas outlet is connected with the plate heat exchanger through a gas outlet pipeline;
the liquid outlet pipeline is connected with a primary capillary tube;
the refrigeration system also comprises a protection flow path, and the protection flow path is sequentially connected with the plate heat exchanger, the expansion container, the bypass capillary tube and the compressor;
a bypass electromagnetic valve is arranged between the expansion container and the plate heat exchanger;
the refrigeration system also comprises a defrosting flow path, and the oil separator, the defrosting stop valve, the defrosting electromagnetic valve and the evaporator are sequentially connected to the defrosting flow path;
and an oil return pipe is arranged on the oil separator and is connected with an air suction port of the compressor.
The utility model has the beneficial effects that:
the purpose of the pre-cooling device on the return path is to cool the mixed refrigerant again by the ultra-low temperature and low pressure refrigerant on the return path, so that the condensation temperature of the mixed refrigerant is lower, generally about 20-30 ℃ lower than that of the refrigerant without the pre-cooling device, the efficiency of the refrigeration system is improved, and the evaporation temperature is lower than that without the pre-cooler.
Drawings
FIG. 1 is a schematic diagram of a refrigeration system of the present application;
FIG. 2 is a schematic diagram of a compressor and oil separator according to the present application;
fig. 3 is a schematic diagram of a precooling apparatus, a gas-liquid separator and a plate heat exchanger according to the present application;
FIG. 4 is a flow diagram of the refrigerant in the present application;
1-a compressor, 11-an exhaust port of the compressor, 12-an air suction port of the compressor, 2-an oil separator, 21-an oil return pipe, 22-an air inlet of the oil separator, 23-an air outlet of the oil separator, 3-a condenser, 4-a drying filter, 5-a precooling device, 51-a liquid inlet of the precooling device, 52-a liquid outlet of the precooling device, 53-an air inlet of the precooling device, 54-an air outlet of the precooling device, 6-a gas-liquid separator, 61-an air outlet, 62-a liquid outlet, 63-a liquid outlet pipeline, 64-a gas outlet pipeline, 7-a plate heat exchanger, 71-an air inlet of the plate heat exchanger, 72-a liquid outlet of the plate heat exchanger, 73-a second air inlet of the plate heat exchanger, 74-a second air outlet of the plate heat exchanger, 8-evaporator, 81-loop pipeline, 911-refrigeration stop valve, 912-refrigeration solenoid valve, 913-return-air stop valve, 914-bypass solenoid valve, 915-defrosting stop valve, 916-defrosting solenoid valve, 921-primary capillary tube, 922-secondary capillary tube, 923-bypass capillary tube and 93-expansion container.
Detailed Description
As shown in fig. 1, a refrigeration system provided with a pre-cooling device includes a refrigeration circuit, a protection flow path, and a defrosting flow path;
the refrigeration loop comprises an inlet flow path and a return flow path, and specifically, the inlet flow path is sequentially connected with a compressor 1, an oil separator 2, a condenser 3, a drying filter 4, a precooling device 5, a gas-liquid separator 6, a plate heat exchanger 7 and an evaporator 8 through a one-way pipeline; the return path is sequentially connected with the evaporator 8, the plate heat exchanger 7, the precooling device 5 and the compressor 1 through a one-way pipeline; wherein, the two ends of the evaporator 8 are respectively connected with the plate heat exchanger 7 through pipelines.
Specifically, as shown in fig. 1-2, the mixed refrigerant is in a low-temperature low-pressure gaseous state in the compressor 1, and after the compressor 1 starts to operate, the mixed refrigerant is changed into a high-temperature high-pressure gaseous state, is discharged from the exhaust port 11 of the compressor, enters the air inlet 22 of the oil separator, and is separated from the refrigerant in the mixed refrigerant through the oil separator 2;
preferably, an oil return pipe 21 is arranged on the oil separator 2, the oil return pipe 21 is connected with the suction port 12 of the compressor, and the refrigerant oil returns to the suction port 12 of the compressor through the oil return pipe 21 to lubricate the compressor;
the separated mixed refrigerant is discharged from the gas outlet 23 of the oil separator, enters the condenser 3 for condensation, then the high-temperature and high-pressure gas state is changed into the normal-temperature and high-pressure liquid state, and the residual moisture and impurities in the liquid mixed refrigerant are removed through the drying and filtering of the drying filter 4.
As shown in fig. 1 and 3, the mixed refrigerant enters the liquid inlet 51 of the pre-cooling device from the filter drier 4, changes from a liquid state with normal temperature and high pressure to a liquid state with low temperature and high pressure, and enters the gas-liquid separator 6 from the liquid outlet 52 of the pre-cooling device, and the purpose of the pre-cooling device is to overcool the mixed refrigerant so as to reduce the temperature of the mixed refrigerant;
the gas-liquid separator 6 is provided with a gas outlet 61 and a liquid outlet 62, the mixed refrigerant is separated into a gas refrigerant and a liquid refrigerant after entering the gas-liquid separator 6, the gas refrigerant is discharged from the gas outlet 61 of the gas-liquid separator, enters the gas inlet 71 of the plate heat exchanger through the gas outlet pipe 64, is cooled in the plate heat exchanger 7 to be in a low-temperature high-pressure liquid state, and is discharged through the liquid outlet 72 of the plate heat exchanger;
the low-temperature high-pressure liquid enters the air inlet of the evaporator 8, is changed into the ultralow-temperature low-pressure gas from the low-temperature high-pressure liquid, and is discharged from the air outlet of the evaporator 8; the second gas inlet 73 of the plate heat exchanger, which is entered by the loop pipe 81, enters the gas inlet 53 of the pre-cooling device by the second gas outlet 74 of the plate heat exchanger;
the liquid refrigerant separated by the gas-liquid separator 6 is a low-temperature high-pressure liquid, is discharged from the liquid outlet 62 of the gas-liquid separator, enters the second air inlet 73 of the plate heat exchanger through the loop pipeline 81, and enters the air inlet 53 of the pre-cooling device through the second air outlet 74 of the plate heat exchanger after being changed into an ultra-low-temperature low-pressure gas state in the plate heat exchanger;
the gaseous refrigerant enters the pre-cooling device 5 and is cooled again to become mixed refrigerant, and the mixed refrigerant is discharged from the gas outlet 54 of the pre-cooling device and enters the gas suction port 11 of the compressor through a pipeline;
the purpose of the pre-cooling device on the return path is to cool the mixed refrigerant again by the ultra-low temperature and low pressure refrigerant on the return path, so that the condensation temperature of the mixed refrigerant is lower, generally about 20-30 ℃ lower than that of the refrigerant without the pre-cooling device, and the efficiency of the refrigerating system is improved.
Preferably, a refrigeration stop valve 911, a secondary capillary tube 922 and a refrigeration electromagnetic valve 912 are respectively arranged between the plate heat exchanger 7 and the evaporator 8 on the inlet flow path;
preferably, an air return stop valve 913 is connected between the evaporator 8 and the plate heat exchanger 7 on the return path, and the air return stop valve 913 is disposed on the loop pipeline 81;
preferably, the liquid outlet pipe 63 is connected with a primary capillary 921.
Preferably, as shown in fig. 1, the refrigeration system in the present application is further provided with a protection flow path, and the protection flow path is sequentially connected to the plate heat exchanger 7, the expansion container 93, the bypass capillary tube 923 and the compressor 1;
preferably, a bypass electromagnetic valve 914 is further arranged on a pipeline between the expansion container 93 and the plate heat exchanger 7, when the pressure in the refrigeration circuit is too high, the bypass electromagnetic valve 914 is opened, and the high-pressure refrigerant enters the expansion container 93 and returns to the suction port 12 of the compressor through a bypass capillary tube 923, so that the function of protecting the system can be achieved;
preferably, refrigerating system in this application still is equipped with the defrosting flow path, it has connected gradually on the defrosting flow path oil separator 2, defrosting stop valve 915, defrosting solenoid valve 916 and evaporimeter 6, it is right as required when evaporimeter 6 defrosts, refrigeration solenoid valve 912, bypass solenoid valve 914 are in the off-state, open defrosting solenoid valve 916, can be right the evaporimeter defrosts, and is simpler, convenient and high-efficient.
Although the embodiments of the present invention have been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the utility model, and all equivalent changes and modifications made within the scope of the present invention should be covered by the claims of the present invention.
Claims (9)
1. A refrigerating system provided with a precooling device is characterized in that: the refrigeration system comprises a refrigeration circuit, wherein the refrigeration circuit comprises an inlet flow path and a return flow path;
the inlet flow path is sequentially connected with a compressor (1), an oil separator (2), a condenser (3), a drying filter (4), a precooling device (5), a gas-liquid separator (6), a plate heat exchanger (7) and an evaporator (8);
the evaporator (8), the plate heat exchanger (7), the precooling device (5) and the compressor (1) are connected to the return path in sequence;
wherein, the two ends of the evaporator (8) are respectively connected with the plate heat exchanger (7).
2. A refrigeration system provided with a pre-cooling device according to claim 1, wherein: and a refrigeration stop valve (911), a secondary capillary tube (922) and a refrigeration electromagnetic valve (912) are respectively connected between the plate heat exchanger (7) and the evaporator (8) on the inlet channel.
3. A refrigeration system provided with a pre-cooling device according to claim 2, wherein: and an air return stop valve (913) is connected between the evaporator (8) and the plate heat exchanger (7) on the return flow path.
4. A refrigeration system provided with a pre-cooling device according to claim 1, wherein: the gas-liquid separator (6) is provided with a gas outlet (61) and a liquid outlet (62), the liquid outlet (62) is connected with the plate heat exchanger (7) through a liquid outlet pipeline, and the gas outlet (61) is connected with the plate heat exchanger (7) through a gas outlet pipeline.
5. A refrigeration system provided with a pre-cooling device according to claim 4, wherein: the liquid outlet pipeline is connected with a primary capillary tube (921).
6. A refrigeration system provided with a pre-cooling device according to claim 1, wherein: refrigerating system still includes the protection flow path, the protection flow path connects gradually plate heat exchanger (7), expansion vessel (93), bypass capillary (923) and compressor (1).
7. A refrigeration system provided with a pre-cooling device according to claim 6, wherein: a bypass electromagnetic valve (914) is arranged between the expansion container (93) and the plate heat exchanger (7).
8. A refrigeration system provided with a pre-cooling device according to claim 1, wherein: the refrigeration system further comprises a defrosting flow path, and the oil separator (2), the defrosting stop valve (915), the defrosting electromagnetic valve (916) and the evaporator (8) are sequentially connected to the defrosting flow path.
9. A refrigeration system with a pre-cooling apparatus according to claim 1, wherein: an oil return pipe (21) is arranged on the oil separator (2), and the oil return pipe (21) is connected with an air suction port of the compressor (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120533738.XU CN216481664U (en) | 2021-03-15 | 2021-03-15 | Refrigerating system with precooling apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120533738.XU CN216481664U (en) | 2021-03-15 | 2021-03-15 | Refrigerating system with precooling apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216481664U true CN216481664U (en) | 2022-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120533738.XU Active CN216481664U (en) | 2021-03-15 | 2021-03-15 | Refrigerating system with precooling apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216481664U (en) |
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2021
- 2021-03-15 CN CN202120533738.XU patent/CN216481664U/en active Active
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