CN113503653A - Multi-compressor refrigeration system and air conditioner - Google Patents
Multi-compressor refrigeration system and air conditioner Download PDFInfo
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- CN113503653A CN113503653A CN202110892865.3A CN202110892865A CN113503653A CN 113503653 A CN113503653 A CN 113503653A CN 202110892865 A CN202110892865 A CN 202110892865A CN 113503653 A CN113503653 A CN 113503653A
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- heat exchanger
- refrigeration system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a multi-compressor refrigeration system and an air conditioner, wherein the multi-compressor refrigeration system comprises: the oil separator comprises an outdoor heat exchanger, a throttling component, an indoor heat exchanger and at least two compressors which are arranged in parallel, wherein an exhaust port of each compressor is connected with an inlet a of the oil separator in parallel, the outdoor heat exchanger is connected with an air outlet b of the oil separator, an air suction port of each compressor is connected with an oil outlet c of the oil separator in parallel, an outlet of the outdoor heat exchanger is connected with a liquid storage device, and a control valve is connected between the liquid storage device and the throttling component in series; when different compressors are switched to work, the control valve is closed, and the currently running compressor is shut down in a delayed mode, so that the refrigerant is stored in the condenser and the liquid storage device. The invention realizes the uniform distribution of the refrigerant when switching different compressors to work, can realize automatic oil return, improves the oil balance problem of a refrigeration system with a plurality of parallel compressors and ensures that each compressor can operate reliably for a long time.
Description
Technical Field
The invention relates to the technical field of refrigeration systems, in particular to a multi-compressor refrigeration system and an air conditioner.
Background
In the refrigeration and air-conditioning industry, individual vehicle air conditioners can adopt a plurality of power driving modes, for example, two compressors are required to be adopted by a refrigeration system when an engine driving mode and a vehicle-mounted diesel generator driving mode are adopted for refrigeration; the refrigerant and lubricating oil distribution problem of the refrigerating system is very important because the space is limited and two compressors need to share one set of evaporator and condenser. Uneven distribution of refrigerant may result in less than ideal refrigeration performance, and uneven distribution of lubricant may result in some compressor being damaged due to oil shortage.
Therefore, how to improve the stability of the multi-compressor parallel refrigeration system is an urgent technical problem to be solved in the industry.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a multi-compressor refrigeration system and an air conditioner.
The technical scheme adopted by the invention is that a multi-compressor refrigeration system is designed, and the multi-compressor refrigeration system comprises: the outdoor heat exchanger, the throttling component, the indoor heat exchanger and at least two compressors which are arranged in parallel are connected, the outlet of the outdoor heat exchanger is connected with a liquid storage device, and a control valve is connected in series between the liquid storage device and the throttling component; when different compressors are switched to work, the control valve is closed, and the currently running compressor is shut down in a delayed mode, so that the refrigerant is stored in the condenser and the liquid storage device.
Preferably, the outlet of the indoor heat exchanger is provided with a pressure sensor; when the pressure value detected by the pressure sensor is lower than the set value P after the control valve is closed0When the compressor is in operation, the compressor is shut down, the control valve is opened, and the other compressor is started to operate.
Preferably, the value P is set0The pressure value detected by the pressure sensor is a set value P when the surface of the air suction pipe of the currently running compressor is frosted after the control valve is closed and obtained through tests0。
Preferably, the multi-compressor refrigeration system further comprises: the air outlet of the compressor is connected with the inlet a of the oil separator in parallel, the outdoor heat exchanger is connected with the air outlet b of the oil separator, and the air suction port of the compressor is connected with the oil outlet c of the oil separator in parallel.
Preferably, the air suction port of each compressor is provided with a switch valve, the switch valve of the air suction port is opened before the compressor is started to operate, the switch valve of the air suction port is closed after the compressor is shut down, and the exhaust port of each compressor is provided with a one-way valve.
In one embodiment, a multiple compressor refrigeration system is provided with two compressors.
Preferably, at most one of said compressors is in operation.
The invention also provides an air conditioner adopting the multi-compressor refrigeration system, and the air conditioner is an air conditioner for a vehicle and the like.
Compared with the prior art, the invention has the following beneficial effects:
1. when different compressors are switched to work, the refrigerant in the section from the throttling component to the indoor heat exchanger is recovered to the liquid storage device and the condenser through delayed stop and closing of the control valve, and the other compressor is opened after the recovery is finished, so that the refrigeration capacity attenuation caused by the reduction of the refrigerant circulation quantity is effectively avoided;
2. the refrigerant discharged from the compressor is subjected to oil-gas separation in the oil separator, and the frozen oil is discharged back to the suction pipe of the compressor through an oil outlet c of the oil separator.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
fig. 1 is a system connection diagram of two compressors according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The principles of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the multi-compressor refrigeration system of the present invention can be applied to a refrigeration device, such as an air conditioner or a refrigerator. The multi-compressor refrigeration system has one outdoor heat exchanger 4, one throttling part 8, one indoor heat exchanger 9 and at least two compressors. An outdoor fan 5 is installed on the outdoor heat exchanger 4, an indoor fan 10 is installed on the indoor heat exchanger 9, an exhaust port of the compressor is connected with an inlet of the outdoor heat exchanger 4 in parallel, an outlet of the outdoor heat exchanger 4 is sequentially connected with a liquid storage device 6, a throttling component 8 and the indoor heat exchanger 9, and an air suction port of the compressor is connected with an outlet of the indoor heat exchanger 9 in parallel. A control valve 7 is connected in series between the liquid reservoir 6 and the throttling component 8, when the control valve 7 is opened, a pipeline between the liquid reservoir 6 and the throttling component 8 is connected, and when the control valve 7 is closed, the pipeline between the liquid reservoir 6 and the throttling component 8 is blocked.
When different compressors are switched to work, the control valve 7 is closed, the currently running compressor is shut down in a delayed mode, refrigerant in a section from the throttling component 8 to the indoor heat exchanger 9 is recovered to the liquid storage device 6 and the outdoor heat exchanger 4 through the pumping action of the compressor, after the refrigerant is recovered, the currently running compressor is shut down, the control valve 7 is opened, and the other compressor is started to run. The total amount of the refrigerant of each compressor in the operation process is the refrigerant stored in the liquid accumulator 6 and the outdoor heat exchanger 4 and the residual refrigerant from the throttling component 8 to the pipe section of the indoor heat exchanger 9, so that the refrigeration capacity attenuation caused by the reduction of the refrigerant circulation amount is effectively avoided, and the uniform distribution of the refrigerant is ensured.
In some embodiments, the outlet of the indoor heat exchanger 9 is equipped with a pressure sensor 11, and after the control valve 7 is closed, when the pressure value detected by the pressure sensor 11 is lower than the set value P0When the refrigerant recovery is finished, the currently running compressor is shut down, the control valve 7 is opened, and the other compressor is started to run.
Since the value P is set each time the compressor is switched0And the residual refrigerant of the throttling component 8 and the pipe section of the indoor heat exchanger 9 is consistent when the compressors are switched, namely the residual refrigerant of the pipe section from the throttling component 8 to the indoor heat exchanger 9 is equal, and the refrigerant storage amounts in the liquid accumulator 6 and the outdoor heat exchanger 4 are equal, so that the total refrigerant amount of each compressor is ensured to be the same when the compressors are operated.
Set value P0Setting according to different types of refrigerants, wherein specific values are acquired through tests, the test process is that after a control valve is closed, the refrigerants in the indoor heat exchanger 9 are continuously sucked by the compressor, when frost is formed on the outer surface of the air suction pipe, when frost is formed on the surface of the air suction pipe of the currently-operated compressor, the refrigerant recovery is basically finished, and at the moment, the pressure value detected by the pressure sensor 11 is a set value P0。
In order to realize oil balance, the multi-compressor refrigeration system is further provided with an oil separator 14, an air outlet of the compressor is connected with an inlet a of the oil separator 14 in parallel, the outdoor heat exchanger 4 is connected with an air outlet b of the oil separator 14, and an air suction port of the compressor is connected with an oil outlet c of the oil separator 14 in parallel. The refrigerant discharged from the compressor is subjected to oil-gas separation in the oil separator 14, the refrigerant is discharged into the outdoor heat exchanger 4 through the gas outlet b, and the refrigerant oil of the compressor is discharged back to the suction port of the compressor through the oil outlet c.
Furthermore, in order to prevent the refrigerant or the refrigerant oil from entering the compressor which does not work, and causing the loss of the refrigerant or the refrigerant oil, the exhaust port of each compressor is provided with the check valve 3, the refrigerant can be ensured not to enter from the exhaust port of the compressor in the operation process, the suction port of each compressor is provided with the switch valve, the switch state of the switch valve is kept to be uniform with the compressor, but in order to avoid the situation that the compressor is vacuumized, the switch valve is opened earlier than the compressor and is closed later than the compressor, namely the switch valve of the suction port of the compressor is opened before the compressor is started to operate, and the switch valve of the suction port of the compressor is closed after the compressor is shut down. The "control valve", "on-off valve", etc. appearing herein may employ a solenoid valve.
It should be noted that when more than two compressors exist in the multi-compressor refrigeration system, at most one compressor is in a working state, and when one compressor is started to operate, the rest compressors are kept off to ensure that the refrigerant and the refrigerant oil are uniformly distributed.
In one embodiment of the present invention, as shown in fig. 1, a multi-compressor refrigeration system is applied to a vehicle air conditioner, and the refrigeration system is provided with two compressors which are driven by an engine and an on-board diesel generator respectively for refrigeration. For the sake of understanding, the operation of the refrigeration system will be described in detail below, with the "first" and "second" distinguishing the two compressors and their corresponding on-off valves.
When the first compressor 1 starts to operate, the control valve 7 and the first switch valve 12 are opened, the second switch valve 13 is closed, and the second switch valve 13 and the one-way valve at the exhaust port of the second compressor 2 ensure that the refrigerant cannot pass through the second compressor 2 in the operation process of the first compressor 1, so that the refrigeration capacity attenuation caused by the reduction of the refrigerant circulation volume is effectively avoided. The refrigerant discharged from the first compressor 1 is subjected to oil-gas separation in the oil separator 14, the refrigerant is discharged through the air outlet b of the oil separator 14 and enters the outdoor heat exchanger, and the refrigeration oil of the first compressor 1 is discharged through the oil outlet c of the oil separator 14 and returns to the suction pipe of the first compressor 1.
When the first compressor 1 is switched to the second compressor 2, the control valve 7 is closed first, at this time, the first compressor 1 still operates normally, the refrigerant in the section from the throttling part 8 to the indoor heat exchanger 9 is recovered to the liquid storage device 6 and the outdoor heat exchanger 4, and when the pressure value detected by the pressure sensor 11 is lower than the set value P0When the first compressor 1 is shut down, then the first switching valve 12 is closed, and thenThe control valve 7 and the second on-off valve 13 are opened, and the second compressor 2 is started to operate. Through the first switch valve 12 and the check valve at the exhaust port of the first compressor 1, it is ensured that the refrigerant does not pass through the first compressor 1 during the operation of the second compressor 1, and the reduction of the refrigerating capacity caused by the reduction of the refrigerant circulation amount is effectively avoided. During the operation of the second compressor 2, the total amount of refrigerant is the residual refrigerant in the pipe section from the throttling element 8 to the indoor heat exchanger 9, and the refrigerant stored in the accumulator 6 and the outdoor heat exchanger 4. The refrigerant discharged from the second compressor 2 is subjected to oil-gas separation in the oil separator 14, the refrigerant is discharged through the air outlet b of the oil separator 14 and enters the outdoor heat exchanger, and the refrigeration oil of the second compressor 1 is discharged through the oil outlet c of the oil separator 14 and returns to the suction pipe of the second compressor 2.
When the second compressor 2 is switched to the first compressor 1 again, the control valve 7 is closed first, at this time, the second compressor 2 still operates normally, the refrigerant in the section from the throttling part 8 to the indoor heat exchanger 9 is recovered to the liquid storage device 6 and the outdoor heat exchanger 4, and when the pressure value detected by the pressure sensor 11 is lower than the set value P0When the second compressor 2 is turned off, the second switch valve 13 is closed, the control valve 7 and the first switch valve 12 are opened, and the first compressor 1 is opened to start running.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A multi-compressor refrigeration system comprising: the outdoor heat exchanger, the throttling component, the indoor heat exchanger and at least two compressors which are arranged in parallel are characterized in that an outlet of the outdoor heat exchanger is connected with a liquid storage device, and a control valve is connected in series between the liquid storage device and the throttling component; when different compressors are switched to work, the control valve is closed, and the currently running compressor is shut down in a delayed mode, so that the refrigerant is stored in the condenser and the liquid storage device.
2. The multiple compressor refrigeration system as claimed in claim 1, wherein the outlet of the indoor heat exchanger is fitted with a pressure sensor; when the pressure value detected by the pressure sensor is lower than the set value P after the control valve is closed0When the compressor is in operation, the compressor is shut down, the control valve is opened, and the other compressor is started to operate.
3. A multiple compressor refrigerant system as claimed in claim 2, wherein the setpoint P is0The pressure value detected by the pressure sensor is the set value P when the surface of the air suction pipe of the currently running compressor is frosted after the control valve is closed and the test is carried out0。
4. The multiple compressor refrigeration system of claim 1, further comprising: the air outlet of the compressor is connected with the inlet a of the oil separator in parallel, the outdoor heat exchanger is connected with the air outlet b of the oil separator, and the air suction port of the compressor is connected with the oil outlet c of the oil separator in parallel.
5. The multi-compressor refrigeration system as claimed in claim 1, wherein each of the compressors has a switching valve installed at a suction port, the switching valve of the suction port is opened before the compressor is started to operate, and the switching valve of the suction port is closed after the compressor is shut down.
6. A multiple compressor refrigeration system as recited in claim 1 wherein a one-way valve is mounted to the discharge of each of said compressors.
7. The multiple compressor refrigeration system of claim 1 wherein there are two compressors.
8. The multiple compressor refrigeration system according to any one of claims 1 to 7 wherein no more than one of the compressors is in operation.
9. Air conditioner characterized in that it uses a multiple compressor refrigeration system according to any of claims 1 to 8.
10. The air conditioner according to claim 9, wherein the air conditioner is a vehicle air conditioner.
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| CN202110892865.3A CN113503653B (en) | 2021-08-04 | 2021-08-04 | Multi-compressor refrigeration system and air conditioner |
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| CN202110892865.3A CN113503653B (en) | 2021-08-04 | 2021-08-04 | Multi-compressor refrigeration system and air conditioner |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114484716A (en) * | 2022-01-11 | 2022-05-13 | 珠海格力电器股份有限公司 | Air conditioner, control method and device thereof and computer readable storage medium |
| CN114704979A (en) * | 2022-04-24 | 2022-07-05 | 珠海格力电器股份有限公司 | Refrigerating system, air conditioner and control method of refrigerating system |
| WO2023068197A1 (en) * | 2021-10-18 | 2023-04-27 | 三菱重工サーマルシステムズ株式会社 | Freezing apparatus |
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| CN114704979A (en) * | 2022-04-24 | 2022-07-05 | 珠海格力电器股份有限公司 | Refrigerating system, air conditioner and control method of refrigerating system |
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