CN214172592U - Double-loop bypass refrigeration system - Google Patents
Double-loop bypass refrigeration system Download PDFInfo
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- CN214172592U CN214172592U CN202023179538.3U CN202023179538U CN214172592U CN 214172592 U CN214172592 U CN 214172592U CN 202023179538 U CN202023179538 U CN 202023179538U CN 214172592 U CN214172592 U CN 214172592U
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Abstract
The utility model discloses a double-loop bypass refrigeration system, which comprises an evaporator, wherein the outlet of the evaporator is connected with a compressor, the outlet of the compressor is divided into two branches, one branch is connected with the inlet of a condenser, and the other branch is connected with a hot gas bypass valve; the outlet of the condenser is connected with the inlet of the liquid storage device, the outlet of the liquid storage device is divided into two branches, one branch is connected with the evaporator, and the other branch is connected with the overheating and cooling expansion valve. The utility model discloses a set up steam bypass valve return circuit and overheat cooling expansion valve return circuit simultaneously in the system, can guarantee that the system also can normal operating under the great condition of load change, maintain the system and normally work under given minimum suction pressure to the compressor that has brought from this is overheated and the problem of oil return difficulty has been solved.
Description
Technical Field
The utility model belongs to refrigeration air conditioning technology, concretely relates to two return circuits bypass refrigerating system.
Background
At present, refrigeration equipment is widely applied to various industries such as food storage, medicine production, national defense engineering, precise instruments and the like. The refrigeration and air conditioning technology plays an increasingly important role in the aspects of improving the living standard of people, guaranteeing national defense equipment, developing social economy and the like. However, in the actual use process, the refrigeration load may vary greatly due to differences in personnel, environment, lighting, weather conditions, and the like. In order to meet the system performance, the energy regulation of the refrigeration system is very important.
The energy regulation method of the existing common refrigeration system mainly comprises the following steps: multi-stage systems, single stage systems with multiple compressors, variable frequency compressors, unloading devices for the compressors themselves, and hot gas bypass are employed. The hot gas bypass methods commonly used at present mainly include: (1) directing the hot gas bypass circuit to the compressor suction duct; (2) the hot gas bypass circuit is directed to the evaporator inlet. The first method can reduce the complexity of the pipeline and is easy to control, but if the control is not good, the problem that the suction gas of the compressor is overheated, so that the motor is overheated is caused; the second method can return the refrigerant to the compressor at normal temperature, and has good oil return performance, but has a great influence on the evaporation temperature, so the application range is limited.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: an object of the utility model is to provide a take steam bypass return circuit and overheat cooling expansion valve return circuit, realize the two return circuit bypass refrigerating system to the accurate control of exhaust temperature.
The technical scheme is as follows: the utility model comprises an evaporator, the outlet of the evaporator is connected with a compressor, the outlet of the compressor is divided into two branches, one branch is connected with the inlet of a condenser, and the other branch is connected with a hot gas bypass valve; the outlet of the condenser is connected with the inlet of the liquid storage device, the outlet of the liquid storage device is divided into two branches, one branch is connected with the evaporator, and the other branch is connected with the overheating and cooling expansion valve.
And a thermostatic expansion valve is connected between the liquid storage device and the evaporator.
A liquid pipe electromagnetic valve is arranged between the liquid storage device and the overheating cooling expansion valve to prevent leakage and to be easily evacuated.
And an air pipe electromagnetic valve is arranged between the hot gas bypass valve and the compressor and used for controlling the on-off of the bypass branch of the bypass hot gas, preventing leakage and easily evacuating.
The outlet of the compressor is provided with a tee joint, and the outlet of the compressor is divided into two branches through the tee joint.
The outlet of the liquid storage device is provided with a tee joint, and the outlet of the liquid storage device is divided into two branches through the tee joint.
And an outlet pipeline of the hot gas bypass valve is connected with an outlet pipeline of the overheating and cooling expansion valve through a tee joint and then connected with an air suction pipe of the compressor.
Has the advantages that: compared with the prior art, the utility model, its beneficial effect lies in: (1) the high-temperature high-pressure gas is directly bypassed to the low-pressure side by adding a hot gas bypass loop so as to maintain the lower evaporation pressure of the system; the problem of frequent start and stop of the compressor caused by load change is solved; (2) an overheating cooling expansion valve loop is added to a pipeline between the outlet of the liquid storage device and the outlet of the hot gas bypass valve, so that the return gas temperature of the compressor can be accurately regulated, and the overheating problem of the compressor is effectively prevented on the premise that the system can normally work under the given minimum suction pressure; (3) even if the working load of the compressor is the minimum load of the compressor, the oil return performance of the system can be better, and the reliable and stable operation of the unit is ensured.
Drawings
Fig. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and the attached drawings.
As shown in fig. 1, the utility model discloses an evaporimeter 1, the exit linkage compressor 5 of evaporimeter 1, the export of compressor 5 divide into two branches, and 8 entrys of condenser are connected to a branch road, and hot gas bypass valve 7 is connected to another branch road. In this embodiment, the outlet of the compressor 5 is provided with a tee joint, and the outlet of the compressor 5 is divided into two branches by the tee joint. An outlet of the condenser 8 is connected with an inlet of the liquid storage device 4, an outlet of the liquid storage device 4 is divided into two branches, one branch is connected with the evaporator 1, and the other branch is connected with the overheating and cooling expansion valve 9. In this embodiment, the outlet of the liquid storage device 4 is provided with a tee joint, and the outlet of the liquid storage device 4 is divided into two branches by the tee joint. A thermostatic expansion valve 2 is connected between the liquid storage device 4 and the evaporator 1, and a liquid pipe electromagnetic valve 3 is arranged between the liquid storage device 4 and the overheating cooling expansion valve 9. An air pipe electromagnetic valve 6 is arranged between the hot gas bypass valve 7 and the compressor 5. The arrangement of the air pipe electromagnetic valve 6 and the liquid pipe electromagnetic valve 3 can effectively prevent leakage and facilitate evacuation of the system. An outlet pipeline of the hot gas bypass valve 7 is connected with an outlet pipeline of the overheating temperature reduction expansion valve 9 through a tee joint and then connected with a gas suction pipe of the compressor 5.
The utility model discloses a working process does:
when the refrigerating system operates, low-temperature and low-pressure refrigerant gas in the evaporator 1 enters the compressor 5, high-temperature and high-pressure refrigerant gas discharged after compression is divided into two paths, wherein one path of the high-temperature and high-pressure refrigerant gas enters the condenser 8 and is condensed into high-temperature and high-pressure liquid to enter the liquid storage device 4, and the liquid discharged from the liquid storage device 4 is throttled and depressurized by the thermostatic expansion valve 2 to become low-temperature and low-pressure liquid to enter the evaporator 1 for normal refrigerating circulation. Along with the continuous change of the system load, the hot gas bypass valve 7 is controlled to be opened according to the suction pressure, meanwhile, the air pipe electromagnetic valve 6 starts to work, and the other path of high-temperature and high-pressure gas enters the air suction pipe of the compressor through the air pipe electromagnetic valve 6 and the thermal bypass valve 7; when the suction temperature of the compressor is too high, the overheating and cooling expansion valve 9 and the liquid pipe electromagnetic valve 3 start to work, a part of high-temperature and high-pressure liquid is changed into low-temperature and low-pressure liquid after passing through the overheating and cooling expansion valve 9 and is fully mixed with high-temperature and high-pressure gas discharged from the hot gas bypass valve 7 and then enters the suction pipe of the compressor, and the system can normally work under the given minimum suction pressure.
Claims (7)
1. A dual circuit bypass refrigeration system, characterized by: the evaporator comprises an evaporator (1), wherein the outlet of the evaporator (1) is connected with a compressor (5), the outlet of the compressor (5) is divided into two branches, one branch is connected with the inlet of a condenser (8), and the other branch is connected with a hot gas bypass valve (7); the outlet of the condenser (8) is connected with the inlet of the liquid storage device (4), the outlet of the liquid storage device (4) is divided into two branches, one branch is connected with the evaporator (1), and the other branch is connected with the overheating and cooling expansion valve (9).
2. The dual circuit bypass refrigerant system as set forth in claim 1, wherein: a thermostatic expansion valve (2) is connected between the liquid storage device (4) and the evaporator (1).
3. The dual circuit bypass refrigerant system as set forth in claim 1, wherein: a liquid pipe electromagnetic valve (3) is arranged between the liquid storage device (4) and the overheating cooling expansion valve (9).
4. The dual circuit bypass refrigerant system as set forth in claim 1, wherein: and an air pipe electromagnetic valve (6) is arranged between the hot gas bypass valve (7) and the compressor (5).
5. The dual circuit bypass refrigeration system according to any one of claims 1 to 4, wherein: the outlet of the compressor (5) is provided with a tee joint, and the outlet of the compressor (5) is divided into two branches through the tee joint.
6. The dual circuit bypass refrigeration system according to any one of claims 1 to 4, wherein: the outlet of the liquid storage device (4) is provided with a tee joint, and the outlet of the liquid storage device (4) is divided into two branches through the tee joint.
7. The dual circuit bypass refrigeration system according to any one of claims 1 to 4, wherein: and an outlet pipeline of the hot gas bypass valve (7) is connected with an outlet pipeline of the overheating and cooling expansion valve (9) through a tee joint and then connected with a gas suction pipe of the compressor (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023179538.3U CN214172592U (en) | 2020-12-25 | 2020-12-25 | Double-loop bypass refrigeration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023179538.3U CN214172592U (en) | 2020-12-25 | 2020-12-25 | Double-loop bypass refrigeration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214172592U true CN214172592U (en) | 2021-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023179538.3U Active CN214172592U (en) | 2020-12-25 | 2020-12-25 | Double-loop bypass refrigeration system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214172592U (en) |
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2020
- 2020-12-25 CN CN202023179538.3U patent/CN214172592U/en active Active
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