CN114877572A - Refrigerant recovery system and control method - Google Patents
Refrigerant recovery system and control method Download PDFInfo
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- CN114877572A CN114877572A CN202210570173.1A CN202210570173A CN114877572A CN 114877572 A CN114877572 A CN 114877572A CN 202210570173 A CN202210570173 A CN 202210570173A CN 114877572 A CN114877572 A CN 114877572A
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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
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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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
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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
- F25B45/00—Arrangements for charging or discharging 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
Abstract
The invention provides a refrigerant recovery system and a control method, wherein the refrigerant recovery system comprises: the refrigerant compression module comprises a first compressor and a second compressor, when the refrigerant flowing out of the refrigerant to be recovered equipment is gaseous, the refrigerant recovery system is in a gaseous recovery state, and the first compressor is connected with the second compressor in series; when the refrigerant flowing out of the refrigerant equipment to be recovered is in a liquid state, the refrigerant recovery system is in a liquid state recovery state, and the first compressor and the second compressor are connected in parallel. According to the refrigerant recovery system, the refrigerant recovery system is in a gaseous recovery state, the first compressor and the second compressor are connected in series, the pressure ratio of each stage of compressor is reduced, and the refrigerant recovery efficiency is improved; when the refrigerant flowing out of the refrigerant equipment to be recovered is in a liquid state, the refrigerant recovery system is in a liquid state recovery state, the first compressor and the second compressor are connected in parallel, the air suction amount is increased, and the refrigerant recovery efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of refrigerant recovery systems, and particularly relates to a refrigerant recovery system and a control method.
Background
With the trend of environmental protection becoming more and more serious, the demand of refrigerant recovery on the market is more and more vigorous. However, in a conventional recovery system, there is usually only one compressor, and when recovering the gaseous refrigerant, the refrigerant recovery speed is slow and the efficiency is low due to the large high-low pressure ratio.
Disclosure of Invention
Therefore, the invention provides a refrigerant recovery system and a control method, which can solve the problems of low refrigerant recovery speed and low efficiency due to large high-low pressure ratio when the refrigerant is recovered.
In order to solve the above problems, the present invention provides a refrigerant recovery system, including:
the refrigerant recovery system comprises a first throttling valve, a refrigerant compression module, a second heat exchanger and a liquid storage tank, wherein the refrigerant flowing out of a refrigerant device to be recovered can enter the refrigerant compression module through the first throttling valve to be compressed, and is recovered in the liquid storage tank in a liquid state after being cooled at the second heat exchanger, the refrigerant compression module comprises a first compressor and a second compressor, when the refrigerant flowing out of the refrigerant device to be recovered is in a gaseous state, the refrigerant recovery system is in a gaseous recovery state, and the first compressor and the second compressor are connected in series; when the refrigerant flowing out of the refrigerant equipment to be recovered is in a liquid state, the refrigerant recovery system is in a liquid state recovery state, and the first compressor and the second compressor are connected in parallel.
In some embodiments of the present invention, the,
the refrigerant compression module also comprises a first pipeline, a second pipeline, a first controllable stop valve, a second controllable stop valve, a third controllable stop valve, a fourth controllable stop valve and a fifth controllable stop valve, wherein the air inlet end of the first compressor and the air inlet end of the second compressor are communicated with a first throttle valve, two ends of the first pipeline are respectively communicated with the air outlet end of the first compressor and the air outlet end of the second compressor, the air outlet end of the first compressor is respectively communicated with the air inlet end of the second compressor and the first end of the second pipeline, the second end of the second pipeline and the air outlet end of the second compressor are respectively communicated with a second heat exchanger, a first controllable stop valve is arranged between the air inlet end of the second compressor and the first throttle valve, the first pipeline is provided with the second controllable stop valve, the second pipeline is provided with the third controllable stop valve, and the fourth controllable stop valve is arranged between the air outlet end of the second compressor and the second heat exchanger, and a fifth controllable stop valve is arranged between the air inlet end of the second compressor and the air outlet end of the first compressor.
In some embodiments of the present invention, the,
the refrigerant recovery system also comprises a first heat exchanger, when the refrigerant recovery system is in a liquid recovery state, the first end of the first heat exchanger is communicated with the outlet air of the first compressor and the outlet air of the second compressor, and the second end of the first heat exchanger is communicated with the second heat exchanger; when the refrigerant recovery system is in a gas recovery state, the first end of the first heat exchanger is communicated with the outlet of the first compressor, and the second end of the first heat exchanger is communicated with the inlet end of the second compressor.
In some embodiments of the present invention, the,
and a heat exchange tank is arranged on a communication pipeline between the second end of the first throttle valve and the refrigerant compression module.
In some embodiments of the present invention, the,
a third pipeline is further arranged between the second heat exchanger and the refrigerant compression module, and a first heat exchange assembly capable of exchanging heat with the refrigerant in the heat exchange tank is arranged on the third pipeline.
In some embodiments of the present invention, the,
and a first drying filter is arranged on a communication pipeline between the heat exchange tank and the refrigerant compression module.
In some embodiments of the present invention, the,
the first throttling valve is an electric control throttling valve, a second sensing device is arranged on a communicating pipeline between the heat exchange tank and the first drying filter, and the second sensing device can acquire the temperature value and the pressure value of the refrigerant flowing out of the heat exchange tank.
In some embodiments of the present invention, the,
a sixth controllable stop valve is arranged on a communicating pipeline between the liquid storage tank and the second heat exchanger; and/or a second drying filter is arranged on a communication pipeline between the sixth controllable stop valve and the second heat exchanger.
In some embodiments of the present invention, the,
a fourth pipeline is further arranged between the second heat exchanger and the refrigerant compression module to be communicated, a seventh controllable stop valve is arranged on the fourth pipeline, the seventh controllable stop valve is opened when the refrigerant recovery system is in a gas recovery state, and the seventh controllable stop valve is closed when the refrigerant recovery system is in a liquid recovery state.
In some embodiments of the present invention, the,
and a fifth pipeline is communicated between the air outlet end of the second drying filter and the air inlet end of the heat exchange tank, and an eighth controllable stop valve is arranged on the fifth pipeline.
In some embodiments of the present invention, the,
the second heat exchanger comprises a semiconductor refrigeration piece and a first heat exchange plate, the first heat exchange plate is arranged on one side of the cold end of the semiconductor refrigeration piece, and the first heat exchange plate cools a refrigerant flowing through the second heat exchanger.
In some embodiments of the present invention, the,
the refrigerant recovery system also comprises a heat recovery system, and the heat recovery system can exchange heat with the first heat exchanger and/or the second heat exchanger and heat the refrigerant in the refrigerant equipment to be recovered by using the recovered heat.
In some embodiments of the present invention, the,
the heat recovery system comprises an air-cooled heat exchanger, a circulating water pump and a fan, wherein the air-cooled heat exchanger pumps heat exchange media through the circulating water pump to exchange heat with the first heat exchanger and/or the second heat exchanger, and the fan blows the heat dissipated by the air-cooled heat exchanger to the equipment for the refrigerant to be recovered.
In some embodiments of the present invention, the,
the heat recovery system further comprises a second heat exchange plate, the second heat exchange plate is arranged on one side of the hot end of the semiconductor refrigerating sheet, and two ends of the second heat exchange plate can be communicated with two ends of the air-cooled heat exchanger.
In some embodiments of the present invention, the,
the heat recovery system further comprises a second heat exchange assembly, the second heat exchange assembly is arranged on the first heat exchanger, and two ends of the second heat exchange assembly can be communicated with two ends of the air-cooled heat exchanger.
In some embodiments of the present invention, the,
and a flow regulating valve is arranged on a pipeline between the second heat exchange assembly and the air-cooled heat exchanger.
In some embodiments of the present invention, the,
a heater is arranged between the air-cooled heat exchanger and the equipment for recovering the refrigerant.
The invention also provides a control method of the refrigerant recovery system, which is used for controlling the refrigerant recovery system and comprises the following steps:
acquiring the state of a refrigerant flowing out of equipment for recovering the refrigerant;
and controlling the refrigerant compression module to switch between a gas recovery state and a liquid recovery state according to the acquired state of the refrigerant.
In some embodiments of the present invention, the,
when the refrigerant flowing out of the refrigerant equipment to be recovered is obtained to be liquid, the opening degree of the first throttle valve is controlled, the sixth controllable stop valve, the first controllable stop valve, the second controllable stop valve and the third controllable stop valve are controlled to be opened, and the fourth controllable stop valve, the fifth controllable stop valve, the seventh controllable stop valve and the eighth controllable stop valve are controlled to be closed; alternatively, the first and second electrodes may be,
when the refrigerant flowing out of the refrigerant equipment to be recovered is obtained and is in a gaseous state, the first throttle valve is controlled to be opened fully, the sixth controllable stop valve, the first controllable stop valve, the second controllable stop valve, the third controllable stop valve and the eighth controllable stop valve are controlled to be closed, and the fourth controllable stop valve, the fifth controllable stop valve and the seventh controllable stop valve are controlled to be opened.
The invention also provides a control method of the refrigerant recovery system, which is characterized in that,
the refrigerant recovery system for controlling the refrigerant recovery system comprises the following steps:
acquiring a control instruction;
when the control command is the refrigerant cycle purification,
and controlling the eighth controllable stop valve, the first controllable stop valve, the second controllable stop valve and the third controllable stop valve to be opened, and controlling the fourth controllable stop valve, the fifth controllable stop valve, the seventh controllable stop valve, the sixth controllable stop valve and the first throttle valve to be closed.
According to the refrigerant recovery system, the refrigerant recovery system is in a gaseous recovery state, and the first compressor and the second compressor are connected in series, so that the pressure ratio of each stage of compressor is reduced, and the refrigerant recovery efficiency is improved; when the refrigerant that waits to retrieve refrigerant equipment outflow is liquid, refrigerant recovery system is in liquid recovery state, and first compressor is parallelly connected with the second compressor, and the increase amount of breathing in improves refrigerant recovery efficiency, and the second heat exchanger makes the refrigerant temperature of retrieving be less than ambient temperature in addition to liquid mode is retrieved in the liquid storage tank, has reduced high-low pressure ratio, improves refrigerant recovery efficiency.
In addition, the control method provided by the invention is based on the refrigerant recovery system, and the beneficial effects of the control method refer to the beneficial effects of the refrigerant recovery system.
Drawings
Fig. 1 is a schematic view of a refrigerant recovery system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a refrigerant recovery system according to an embodiment of the invention;
fig. 3 is a schematic view of a heat recovery system of a refrigerant recovery system according to an embodiment of the invention.
Fig. 4 is a schematic diagram of a control system according to an embodiment of the present invention.
The reference numerals are represented as:
1. a first compressor; 2. a second compressor; 3. a first throttle valve; 4. a first heat exchanger; 5. a second heat exchanger; 6. a liquid storage tank; 7. a first controllable stop valve; 8. a second controllable stop valve; 9. a third controllable stop valve; 10. a fourth controllable stop valve; 11. a fifth controllable stop valve; 12. an oil separator; 13. a heat exchange tank; 14. a first dry filter; 15. a sixth controllable stop valve; 16. a second dry filter; 17. a seventh controllable stop valve; 18. an eighth controllable stop valve; 19. a semiconductor refrigeration sheet; 20. a first heat exchange plate; 21. a second heat exchange plate; 22. equipment for refrigerant to be recovered; 23. an air-cooled heat exchanger; 24. a fan; 25. a water circulating pump; 26. a flow regulating valve; 27. a heater; 28. and a controller.
Detailed Description
Referring to fig. 1 to 4, according to an embodiment of the present invention, a refrigerant recovery system includes:
the refrigerant recovery system comprises a first throttling valve 3, a refrigerant compression module, a second heat exchanger 5 and a liquid storage tank 6, wherein the refrigerant flowing out of a refrigerant device 22 to be recovered can enter the refrigerant compression module through the first throttling valve 3 to be compressed, and is cooled at the second heat exchanger 5 and then recovered in the liquid storage tank 6 in a liquid state mode, the refrigerant compression module comprises a first compressor 1 and a second compressor 2, when the refrigerant flowing out of the refrigerant device 22 to be recovered is in a gaseous state, the refrigerant recovery system is in a gaseous recovery state, and the first compressor 1 is connected with the second compressor 2 in series; when the refrigerant flowing out of the refrigerant to be recovered device 22 is in a liquid state, the refrigerant recovery system is in a liquid state recovery state, and the first compressor 1 is connected in parallel with the second compressor 2.
The device 22 for recovering refrigerant may be a device containing refrigerant, such as a household air conditioner, a commercial air conditioner, and a heat dissipation chamber.
The refrigerant recovery system of this embodiment includes: the refrigerant recovery system comprises a first throttling valve 3, a refrigerant compression module, a second heat exchanger 5 and a liquid storage tank 6, wherein the refrigerant flowing out of the refrigerant to be recovered equipment 22 can enter the refrigerant compression module through the first throttling valve 3 to be compressed, and is cooled at the second heat exchanger 5 and then recovered in the liquid storage tank 6 in a liquid state mode, the refrigerant compression module comprises a first compressor 1 and a second compressor 2, when the refrigerant flowing out of the refrigerant to be recovered equipment 22 is in a gaseous state, the refrigerant recovery system is in a gaseous recovery state, the first compressor 1 and the second compressor 2 are connected in series, the pressure ratio of each stage of compressor is reduced, and the refrigerant recovery efficiency is improved; when the refrigerant flowing out of the refrigerant device 22 to be recovered is liquid, the refrigerant recovery system is in a liquid recovery state, the first compressor 1 is connected in parallel with the second compressor 2, the air suction amount is increased, and the refrigerant recovery efficiency is improved.
In some embodiments of the present invention, the,
a first sensing device is arranged between the first throttle valve 3 and the refrigerant device 22 to be recovered.
A first sensing device is arranged between the first throttle valve 3 and the equipment 22 for refrigerant to be recovered in this embodiment, the state of the refrigerant flowing out of the equipment 22 for refrigerant to be recovered is obtained through the first sensing device, and when the refrigerant is in a liquid state, the first compressor 1 and the second compressor 2 of the refrigerant compression module can be controlled by the controller 28 to be switched to the liquid state recovery state in parallel connection; when the refrigerant is in the gaseous state, the controller 28 may control the first compressor 1 and the second compressor 2 of the refrigerant compression module to be switched to the gaseous state recovery state when the refrigerant compression module is connected in series.
In some embodiments of the present invention, the,
the refrigerant compression module also comprises a first pipeline, a second pipeline, a first controllable stop valve 7, a second controllable stop valve 8, a third controllable stop valve 9, a fourth controllable stop valve 10 and a fifth controllable stop valve 11, wherein the air inlet end of the first compressor 1 and the air inlet end of the second compressor 2 are both communicated with the first throttle valve 3, two ends of the first pipeline are respectively communicated with the air outlet end of the first compressor 1 and the air outlet end of the second compressor 2, the air outlet end of the first compressor 1 is respectively communicated with the air inlet end of the second compressor 2 and the first end of the second pipeline, the second end of the second pipeline and the air outlet end of the second compressor 2 are respectively communicated with the second heat exchanger 5, the first controllable stop valve 7 is arranged between the air outlet end of the second compressor 2 and the first throttle valve 3, the first pipeline is provided with the second controllable stop valve 8, the second pipeline is provided with the third controllable stop valve 9, a fourth controllable stop valve 10 is arranged between the air outlet end of the second compressor 2 and the second heat exchanger 5, and a fifth controllable stop valve 11 is arranged between the air inlet end of the second compressor 2 and the air outlet end of the first compressor 1.
The refrigerant compression module of this embodiment further includes a first pipeline, a second pipeline, a first controllable stop valve 7, a second controllable stop valve 8, a third controllable stop valve 9, a fourth controllable stop valve 10 and a fifth controllable stop valve 11, the air inlet end of the first compressor 1 and the air inlet end of the second compressor 2 are both communicated with the first throttle valve 3, both ends of the first pipeline are respectively communicated with the air outlet end of the first compressor 1 and the air outlet end of the second compressor 2, the air outlet end of the first compressor 1 is respectively communicated with the air inlet end of the second compressor 2 and the first end of the second pipeline, the second end of the second pipeline and the air outlet end of the second compressor 2 are respectively communicated with the second heat exchanger 5, the first controllable stop valve 7 is disposed between the air inlet end of the second compressor 2 and the first throttle valve 3, the second controllable stop valve 8 is disposed on the first pipeline, the third controllable stop valve 9 is disposed on the second pipeline, a fourth controllable stop valve 10 is arranged between the air outlet end of the second compressor 2 and the second heat exchanger 5, and a fifth controllable stop valve 11 is arranged between the air inlet end of the second compressor 2 and the air outlet end of the first compressor 1.
Specifically, when the refrigerant flowing out of the refrigerant to be recovered device 22 is in a liquid state, the controller 28 may control the opening of the first throttle valve 3, open the first controllable stop valve 7, the second controllable stop valve 8, and the third controllable stop valve 9, and close the fourth controllable stop valve 10 and the fifth controllable stop valve 11, so as to switch the refrigerant compression module to the liquid state recovery state; when the refrigerant flowing out of the refrigerant equipment 22 to be recovered is gaseous, the controller 28 can control the first throttle valve 3 to be fully opened, the first controllable stop valve 7, the second controllable stop valve 8 and the third controllable stop valve 9 are closed, the fourth controllable stop valve 10 and the fifth controllable stop valve 11 are controlled to be opened, and the refrigerant compression module is switched to be in a gaseous recovery state.
In the actual circulation process of the refrigerant, when the refrigerant recovery system is in a liquid recovery state, the refrigerant flows out of the to-be-recovered refrigerant device 22, sequentially flows through the first throttle valve 3 and then flows into the first compressor 1 and the second compressor 2 respectively, the refrigerant flowing out of the second compressor 2 is converged with the refrigerant flowing out of the first compressor 1 through the first pipeline, then flows through the second pipeline, is cooled by the second heat exchanger 5 and then flows into the liquid storage tank 6 in a liquid state; when the refrigerant recovery system is in a gas recovery state, the refrigerant flows out of the to-be-recovered refrigerant device 22, sequentially passes through the first throttle valve 3, the first compressor 1 and the second compressor 2, then is cooled by the second heat exchanger 5, and then flows into the liquid storage tank 6 in a liquid state. The refrigerant compression module is switched between a gas recovery state and a liquid recovery state.
In some embodiments of the present invention, the,
the refrigerant recovery system also comprises a first heat exchanger 4, when the refrigerant recovery system is in a liquid recovery state, a first end of the first heat exchanger 4 is communicated with the outlet air of the first compressor 1 and the outlet air of the second compressor 2, and a second end of the first heat exchanger 4 is communicated with the second heat exchanger 5; when the refrigerant recovery system is in a gas recovery state, the first end of the first heat exchanger 4 is communicated with the outlet of the first compressor 1, and the second end of the first heat exchanger 4 is communicated with the inlet of the second compressor 2.
When the refrigerant recovery system is in a gaseous recovery state, the first compressor 1 and the second compressor 2 are connected in series, and the first heat exchanger 4 is positioned on a pipeline between the first compressor 1 and the second compressor 2, so that intermediate cooling is performed through the heat exchanger 4, the pressure ratio of each stage of compressor can be reduced, and the efficiency of the compressor can be improved; the suction superheat degree of the second compressor can be reduced, and the compression efficiency is improved; when the refrigerant recovery system is in a liquid recovery state, the refrigerant is cooled step by step through the first heat exchanger 4 and the second heat exchanger 5, and the heat exchange pressure of the second heat exchanger 5 is reduced.
In some embodiments of the present invention, the,
the second end of the first heat exchanger 4 is provided with an oil separator 12.
The second end of the first heat exchanger 4 is provided with an oil separator 12, and oil in the refrigerant is separated by the oil separator 12.
In some embodiments of the present invention, the,
a heat exchange tank 13 is arranged on a communication pipeline between the second end of the first throttle valve 3 and the refrigerant compression module.
The communicating pipe between the second end of the first throttle valve 3 and the refrigerant compression module of this embodiment is provided with the heat exchange tank 13, the refrigerant flowing out from the refrigerant equipment 22 to be recovered flows into the heat exchange tank 13 through the first throttle valve 3, the evaporation speed of the gaseous refrigerant is accelerated in the heat exchange tank 13, the gaseous refrigerant flows out from the top of the heat exchange tank 13, and the lubricating oil entrained in the refrigerant is accumulated at the bottom of the pipe, therefore, when the refrigerant recovery system is in a liquid recovery state, the gasification and evaporation of the liquid refrigerant in the heat exchange tank 13 are accelerated by using the high-temperature refrigerant flowing out of the refrigerant compression module, meanwhile, the separation of the lubricating oil entrained in the refrigerant is also realized, and the recovery speed of the refrigerant is accelerated.
In some embodiments of the present invention, the,
a third pipeline is further arranged between the second heat exchanger 5 and the refrigerant compression module, and a first heat exchange assembly capable of exchanging heat with the refrigerant in the heat exchange tank 13 is arranged on the third pipeline.
In this embodiment, a third pipeline is further disposed between the second heat exchanger 5 and the refrigerant compression module, the third pipeline is provided with a first heat exchange assembly capable of exchanging heat with the refrigerant in the heat exchange tank 13, when the refrigerant recovery system is in a liquid recovery state, the heat of the high-temperature refrigerant flowing out of the refrigerant compression module can heat the refrigerant in the heat exchange tank 13 through the first heat exchange assembly of the third pipeline, so as to accelerate the recovery speed of the refrigerant, when the refrigerant recovery system is in a gaseous recovery state, the refrigerant can directly flow into the second heat exchanger 5 without passing through the third pipeline, so as to prevent overheating of the gaseous refrigerant flowing into the heat exchange tank 13 from the to-be-recovered refrigerant device 22, when the refrigerant directly flows into the second heat exchanger 5 without passing through the third pipeline, a valve can be disposed on the third pipeline, and when the refrigerant recovery system is in a liquid recovery state, and (4) opening the valve, and closing the valve when the refrigerant recovery system is in the state of gaseous refrigerant overheating.
In some embodiments of the present invention, the,
a first drying filter 14 is arranged on a communication pipeline between the heat exchange tank 13 and the refrigerant compression module.
A first dry filter 14 is disposed on a communication pipeline between the heat exchange tank 13 and the refrigerant compression module in this embodiment, and the refrigerant is dried by the first dry filter 14.
In some embodiments of the present invention, the,
the first throttle valve 3 is an electric control throttle valve, a second sensing device is arranged on a communication pipeline between the heat exchange tank 13 and the first drying filter 14, and the second sensing device can acquire the temperature value and the pressure value of the refrigerant flowing out of the heat exchange tank 13.
The communicating pipe between the heat exchange tank 13 and the first dry filter 14 of this embodiment is provided with the second sensing device, and the second sensing device can acquire the temperature and the pressure of the refrigerant flowing out of the heat exchange tank 13, and the controller 28 controls the opening degree of the first controllable stop valve 7 through the feedback of the second sensing device, so as to ensure the superheat degree of the refrigerant imported by the first compressor 1 and the second compressor 2.
In some embodiments of the present invention, the,
a sixth controllable stop valve 15 is arranged on a communicating pipeline between the liquid storage tank 6 and the second heat exchanger 5; and/or a second drying filter 16 is arranged on a communication pipeline between the sixth controllable stop valve 15 and the second heat exchanger 5.
A communication pipeline between the liquid storage tank 6 and the second heat exchanger 5 is provided with a sixth controllable stop valve 15, and the sixth controllable stop valve 15 can be closed after collection is completed to store a refrigerant in the liquid storage tank 6.
In addition, in the present embodiment, a second dry filter 16 is disposed on a communication line between the sixth controllable stop valve 15 and the second heat exchanger 5, and the refrigerant is dried by the second dry filter 16.
In some embodiments of the present invention, the,
and a third sensing device is arranged on a communication pipeline between the second heat exchanger 5 and the second drying and filtering device 16.
A third sensing device is disposed on the communication pipeline between the second heat exchanger 5 and the second filter drier 16 in this embodiment, so that the state of the refrigerant flowing out of the second heat exchanger 5 can be obtained through the third sensing device, and the cooling temperature of the second heat exchanger 5 can be controlled through the controller 28, so as to ensure that the refrigerant flowing out of the second heat exchanger 5 is in a liquid state.
In some embodiments of the present invention, the,
a fourth pipeline is further arranged between the second heat exchanger 5 and the refrigerant compression module to be communicated, a seventh controllable stop valve 17 is arranged on the fourth pipeline, when the refrigerant recovery system is in a gas recovery state, the seventh controllable stop valve 17 is opened, and when the refrigerant recovery system is in a liquid recovery state, the seventh controllable stop valve 17 is closed.
In the embodiment, the second heat exchanger 5 is communicated with the refrigerant compression module through a fourth pipeline, the fourth pipeline is provided with a seventh controllable stop valve 17, when the refrigerant is in a gaseous recovery state, the refrigerant flowing out of the refrigerant compression module flows into the second heat exchanger 5 through the fourth pipeline, and when the refrigerant recovery system is in the gaseous recovery state, the seventh controllable stop valve 17 is opened, so that part of the refrigerant is communicated from the fourth pipeline and flows into the second heat exchanger 5, and the gaseous refrigerant flowing into the heat exchange tank 13 from the refrigerant to be recovered device 22 is prevented from being overheated; when the refrigerant recovery system is in a liquid recovery state, the seventh controllable stop valve 17 is closed, so that the heat of the high-temperature refrigerant flowing out of the refrigerant compression module from all the refrigerants heats the liquid refrigerant in the heat exchange tank 13 through the first heat exchange assembly, and the refrigerant recovery speed is accelerated.
In some embodiments of the present invention, the,
a fifth pipeline is communicated between the air outlet end of the second drying filter 16 and the air inlet end of the heat exchange tank 13, and an eighth controllable stop valve 18 is arranged on the fifth pipeline.
A fifth pipeline is arranged between the air outlet end of the second drying filter 16 and the air inlet end 13 of the heat exchange tank, an eighth controllable stop valve 18 is arranged on the fifth pipeline, the eighth controllable stop valve 18 can be controlled by a controller 28, the first controllable stop valve 7, the second controllable stop valve 8 and the third controllable stop valve 9 are opened, the fourth controllable stop valve 10, the fifth controllable stop valve 11, the seventh controllable stop valve 17, the sixth controllable stop valve 15 and the first throttle valve 3 are controlled to be closed, so that the refrigerant is circulated, and the refrigerant is purified.
In some embodiments of the present invention, the,
the second heat exchanger 5 comprises a semiconductor refrigeration sheet 19 and a first heat exchange plate 20, the first heat exchange plate 20 is arranged on one side of the cold end of the semiconductor refrigeration sheet 19, and the first heat exchange plate 20 cools the refrigerant flowing through the second heat exchanger 5 so as to enable the refrigerant to be recovered in the liquid state in the liquid storage tank 6.
The second heat exchanger 5 of this embodiment includes the semiconductor refrigeration piece 19 and first heat exchange plate 20, and first heat exchange plate 20 sets up in semiconductor refrigeration piece 19 cold junction one side, and first heat exchange plate 20 cools off the refrigerant that flows through second heat exchanger 5 to the realization collected refrigerant is liquid.
In some embodiments of the present invention, the,
the refrigerant recovery system further comprises a heat recovery system, and the heat recovery system can exchange heat with the first heat exchanger 4 and/or the second heat exchanger 5 and heat the refrigerant in the refrigerant equipment 22 to be recovered by using the recovered heat.
The recovery system of this embodiment still includes heat recovery system, and heat recovery system can carry out the heat transfer and heat the refrigerant in treating recovery refrigerant equipment 22 with the heat of retrieving with first heat exchanger 4 and/or second heat exchanger 5, increases low pressure recovery pressure, reduces the compressor and compresses the ratio, improves recovery efficiency.
In some embodiments of the present invention, the,
the heat recovery system comprises an air-cooled heat exchanger 23, a circulating water pump 25 and a fan 24, wherein the air-cooled heat exchanger 23 pumps heat exchange media through the circulating water pump 25 to exchange heat with the first heat exchanger 4 and/or the second heat exchanger 5, and the fan 24 blows the heat dissipated by the air-cooled heat exchanger 23 to the refrigerant equipment 22 to be recovered.
The heat recovery system of this embodiment includes air-cooled heat exchanger 23, circulating water pump 25 and fan 24, air-cooled heat exchanger 23 sets up in the one side of waiting to retrieve refrigerant equipment 22, fan 24 sets up in one side that air-cooled heat exchanger 23 kept away from waiting to retrieve refrigerant equipment 22, the air outlet of fan 24 is towards waiting to retrieve refrigerant equipment 22, air-cooled heat exchanger 23 carries out the heat transfer through circulating water pump 25 pump sending heat transfer medium and first heat exchanger 4 and/or second heat exchanger 5, fan 24 blows the heat that gives off of air-cooled heat exchanger 23 to waiting to retrieve refrigerant equipment 22, heat in order to treating to retrieve refrigerant equipment 22, and then realize treating the refrigerant in retrieving refrigerant equipment 22 and heating, in order to reduce the pressure differential between waiting to retrieve refrigerant equipment 22 and the liquid storage pot 6, the recovery speed of refrigerant has been accelerated.
In some embodiments of the present invention, the,
the heat recovery system further comprises a second heat exchange plate 21, the second heat exchange plate 21 is arranged on one side of the hot end of the semiconductor chilling plate 19, and two ends of the second heat exchange plate 21 can be communicated with two ends of the air-cooled heat exchanger 23.
The heat recovery system of this embodiment still includes second heat transfer board 21, and second heat transfer board 21 sets up in 19 hot junction one side of semiconductor refrigeration piece, and the both ends of second heat transfer board 21 can be linked together with the both ends of air-cooled heat exchanger 23, and second heat transfer board 21 can carry out the heat transfer with 19 hot junctions of semiconductor refrigeration piece to retrieve the heat that 19 hot junctions of semiconductor refrigeration piece and refrigerant released, provide the heat to air-cooled heat exchanger 23.
In some embodiments of the present invention, the,
the heat recovery system further comprises a second heat exchange assembly, the second heat exchange assembly is arranged on the first heat exchanger 4, and two ends of the second heat exchange assembly can be communicated with two ends of the air-cooled heat exchanger 23.
The heat recovery system of this embodiment still includes second heat exchange assembly, and second heat exchange assembly sets up on first heat exchanger 4, and second heat exchange assembly's both ends can be linked together with the both ends of air-cooled heat exchanger 23, retrieves the heat that the refrigerant released in first heat exchanger 4 through second heat exchange assembly to provide the heat to air-cooled heat exchanger 23.
In some embodiments of the present invention, the,
a flow regulating valve 26 is arranged on a pipeline between the second heat exchange assembly and the air-cooled heat exchanger 23.
The flow regulating valve 26 is arranged on the pipeline between the second heat exchange assembly and the air-cooled heat exchanger 23, and the flow of the heat exchange medium between the second heat exchange assembly and the air-cooled heat exchanger 23 can be controlled through the flow regulating valve 26, so that the controllable cooling of the first heat exchanger 4 is realized.
In some embodiments of the present invention, the,
a heater 27 is arranged between the air-cooled heat exchanger 23 and the refrigerant device 22 to be recovered.
The heater 27 is disposed between the air-cooled heat exchanger 23 and the device 22 for cooling medium to be recovered, the heater 27 may be an air-cooled PTC heater, and in the final stage of recovery or in winter, when the heat dissipation of the air-cooled heat exchanger 23 is small, the heater 27 may be turned on to provide sufficient heat for heating the device 22 for cooling medium to be recovered, so as to accelerate the recovery speed.
The invention also provides a control method of the refrigerant recovery system, which is used for controlling the refrigerant recovery system and comprises the following steps:
acquiring the state of the refrigerant flowing out of the refrigerant equipment 22 to be recovered;
and controlling the refrigerant compression module to switch between a gas recovery state and a liquid recovery state according to the acquired state of the refrigerant.
In some embodiments of the present invention, the,
when the refrigerant flowing out of the refrigerant equipment 22 to be recovered is obtained and is in a liquid state, the opening degree of the first throttle valve 3 is controlled, the sixth controllable stop valve 15, the first controllable stop valve 7, the second controllable stop valve 8 and the third controllable stop valve 9 are controlled to be opened, and the fourth controllable stop valve 10, the fifth controllable stop valve 11, the seventh controllable stop valve 17 and the eighth controllable stop valve 18 are controlled to be closed.
In some embodiments of the present invention, the,
when the refrigerant flowing out of the refrigerant equipment 22 to be recovered is obtained and is in a gaseous state, the first throttle valve 3 is controlled to be fully opened, the sixth controllable stop valve 15, the first controllable stop valve 7, the second controllable stop valve 8, the third controllable stop valve 9 and the eighth controllable stop valve 18 are controlled to be closed, and the fourth controllable stop valve 10, the fifth controllable stop valve 11 and the seventh controllable stop valve 17 are controlled to be opened.
The invention also provides a control method of the refrigerant recovery system, which is characterized in that,
the refrigerant recovery system for controlling the refrigerant recovery system comprises the following steps:
acquiring a control instruction;
when the control command is the refrigerant circulation purification,
and controlling the eighth controllable stop valve 18, the first controllable stop valve 7, the second controllable stop valve 8 and the third controllable stop valve 9 to be opened, and controlling the fourth controllable stop valve 10, the fifth controllable stop valve 11, the seventh controllable stop valve 17, the sixth controllable stop valve 15 and the first throttle valve 3 to be closed.
The refrigerant recovery system is provided with two compressors, and when the high-pressure ratio and the low-pressure ratio are lower, a parallel compressor mode is adopted; when the high pressure and the low pressure are high, a serial compression mode is used, the pressure ratio of each stage of compressor is reduced, and the efficiency of the compressor is improved. In addition, the refrigerant recovery system provided by the invention is provided with a heat recovery system, the semiconductor refrigeration sheet pair is used for cooling, the high-low pressure ratio of the compressor is reduced, the efficiency of the compressor is improved, the heat recovered from the hot end of the semiconductor refrigeration sheet 19 and the first heat exchanger 4 is recovered through the heat recovery system, the air-cooled heat exchanger 23 is used for heating the refrigerant equipment 22 to be recovered, the low-pressure recovery pressure is increased, the compression ratio of the compressor is reduced, and the recovery efficiency is improved.
Those skilled in the art will readily appreciate that the advantageous features of the above described modes can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (20)
1. A refrigerant recovery system, comprising:
the refrigerant recovery system comprises a first throttling valve (3), a refrigerant compression module, a second heat exchanger (5) and a liquid storage tank (6), wherein a refrigerant flowing out of a refrigerant device (22) to be recovered can enter the refrigerant compression module through the first throttling valve (3) to be compressed, and is recovered in the liquid storage tank (6) in a liquid state mode after being cooled at the second heat exchanger (5), the refrigerant compression module comprises a first compressor (1) and a second compressor (2), when the refrigerant flowing out of the refrigerant device (22) to be recovered is in a gaseous state, the refrigerant recovery system is in a gaseous recovery state, and the first compressor (1) is connected with the second compressor (2) in series; when the refrigerant flowing out of the refrigerant to be recovered equipment (22) is in a liquid state, the refrigerant recovery system is in a liquid state recovery state, and the first compressor (1) and the second compressor (2) are connected in parallel.
2. The refrigerant recovery system as claimed in claim 1,
the refrigerant compression module further comprises a first pipeline, a second pipeline, a first controllable stop valve (7), a second controllable stop valve (8), a third controllable stop valve (9), a fourth controllable stop valve (10) and a fifth controllable stop valve (11), wherein the air inlet end of the first compressor (1) and the air inlet end of the second compressor (2) are communicated with the first throttling valve (3), the two ends of the first pipeline are respectively communicated with the air outlet end of the first compressor (1) and the air outlet end of the second compressor (2), the air outlet end of the first compressor (1) is respectively communicated with the air inlet end of the second compressor (2) and the first end of the second pipeline, the second end of the second pipeline and the air outlet end of the second compressor (2) are respectively communicated with the second heat exchanger (5), and the second throttling valve (3) is arranged between the air inlet end of the second compressor (2) and the first throttling valve (3) The controllable stop valve (7), be provided with on the first pipeline second controllable stop valve (8), be provided with on the second pipeline third controllable stop valve (9), the end of giving vent to anger of second compressor (2) with be provided with between second heat exchanger (5) fourth controllable stop valve (10), the inlet end of second compressor (2) with the end of giving vent to anger of first compressor (1) is provided with between the end fifth controllable stop valve (11).
3. The refrigerant recovery system according to claim 2,
the liquid refrigerant recovery system is characterized by further comprising a first heat exchanger (4), when the refrigerant recovery system is in the liquid recovery state, a first end of the first heat exchanger (4) is communicated with the outlet air of the first compressor (1) and the outlet air of the second compressor (2), and a second end of the first heat exchanger (4) is communicated with the second heat exchanger (5); when the refrigerant recovery system is in the gas recovery state, the first end of the first heat exchanger (4) is communicated with the outlet of the first compressor (1), and the second end of the first heat exchanger (4) is communicated with the inlet of the second compressor (2).
4. The refrigerant recovery system according to claim 2,
and a heat exchange tank (13) is arranged on a communication pipeline between the second end of the first throttle valve (3) and the refrigerant compression module.
5. The refrigerant recovery system as claimed in claim 4,
a third pipeline is further arranged between the second heat exchanger (5) and the refrigerant compression module, and a first heat exchange assembly capable of exchanging heat with the refrigerant in the heat exchange tank (13) is arranged on the third pipeline.
6. The refrigerant recovery system as claimed in claim 4,
and a first drying filter (14) is arranged on a communication pipeline between the heat exchange tank (13) and the refrigerant compression module.
7. The refrigerant recovery system as claimed in claim 6,
the first throttling valve (3) is an electric control throttling valve, a second sensing device is arranged on a communicating pipeline between the heat exchange tank (13) and the first drying filter (14), and the second sensing device can acquire the temperature value and the pressure value of a refrigerant flowing out of the heat exchange tank (13).
8. The refrigerant recovery system as claimed in claim 4,
a sixth controllable stop valve (15) is arranged on a communicating pipeline between the liquid storage tank (6) and the second heat exchanger (5); and/or a second drying filter (16) is arranged on a communication pipeline between the sixth controllable stop valve (15) and the second heat exchanger (5).
9. The refrigerant recovery system according to claim 8,
a fourth pipeline is further arranged between the second heat exchanger (5) and the refrigerant compression module to be communicated, a seventh controllable stop valve (17) is arranged on the fourth pipeline, when the refrigerant recovery system is in the gas recovery state, the seventh controllable stop valve (17) is opened, and when the refrigerant recovery system is in the liquid recovery state, the seventh controllable stop valve (17) is closed.
10. The refrigerant recovery system according to claim 9,
and a fifth pipeline is communicated between the air outlet end of the second drying filter (16) and the air inlet end of the heat exchange tank (13), and an eighth controllable stop valve (18) is arranged on the fifth pipeline.
11. The refrigerant recovery system according to claim 3,
the second heat exchanger (5) comprises a semiconductor refrigeration piece (19) and a first heat exchange plate (20), the first heat exchange plate (20) is arranged on one side of the cold end of the semiconductor refrigeration piece (19), and the first heat exchange plate (20) cools a refrigerant flowing through the second heat exchanger (5).
12. The refrigerant recovery system as set forth in claim 11,
the heat recovery system can exchange heat with the first heat exchanger (4) and/or the second heat exchanger (5) and heat the refrigerant in the refrigerant equipment (22) to be recovered by using recovered heat.
13. The refrigerant recovery system according to claim 12,
the heat recovery system comprises an air-cooled heat exchanger (23), a circulating water pump (25) and a fan (24), wherein the air-cooled heat exchanger (23) pumps heat exchange media through the circulating water pump (25) to exchange heat with the first heat exchanger (4) and/or the second heat exchanger (5), and the fan (24) blows the heat emitted by the air-cooled heat exchanger (23) to the to-be-recovered refrigerant equipment (22).
14. The refrigerant recovery system as set forth in claim 13,
the heat recovery system further comprises a second heat exchange plate (21), the second heat exchange plate (21) is arranged on one side of the hot end of the semiconductor refrigerating sheet (19), and two ends of the second heat exchange plate (21) can be communicated with two ends of the air-cooled heat exchanger (23).
15. The refrigerant recovery system as set forth in claim 13,
the heat recovery system further comprises a second heat exchange assembly, the second heat exchange assembly is arranged on the first heat exchanger (4), and two ends of the second heat exchange assembly can be communicated with two ends of the air-cooled heat exchanger (23).
16. The refrigerant recovery system as set forth in claim 15,
and a flow regulating valve (26) is arranged on a pipeline between the second heat exchange assembly and the air-cooled heat exchanger (23).
17. The refrigerant recovery system as set forth in claim 13,
and a heater (27) is arranged between the air-cooled heat exchanger (23) and the equipment (22) for the refrigerant to be recovered.
18. A control method of a refrigerant recovery system is characterized in that,
the refrigerant recovery system for controlling the refrigerant recovery system according to claim 10, comprising the steps of:
acquiring the state of the refrigerant flowing out of the refrigerant equipment (22) to be recovered;
and controlling the refrigerant compression module to switch between the gas recovery state and the liquid recovery state according to the acquired state of the refrigerant.
19. The control method according to claim 18,
when the refrigerant flowing out of the refrigerant to be recovered device (22) is obtained to be in a liquid state, the opening degree of the first throttle valve (3) is controlled, the sixth controllable stop valve (15), the first controllable stop valve (7), the second controllable stop valve (8) and the third controllable stop valve (9) are controlled to be opened, and the fourth controllable stop valve (10), the fifth controllable stop valve (11), the seventh controllable stop valve (17) and the eighth controllable stop valve (18) are controlled to be closed; alternatively, the first and second electrodes may be,
when the refrigerant flowing out of the refrigerant to be recovered device (22) is obtained to be gaseous, the first throttle valve (3) is controlled to be fully opened, the sixth controllable stop valve (15), the first controllable stop valve (7), the second controllable stop valve (8), the third controllable stop valve (9) and the eighth controllable stop valve (18) are controlled to be closed, and the fourth controllable stop valve (10), the fifth controllable stop valve (11) and the seventh controllable stop valve (17) are controlled to be opened.
20. A control method of a refrigerant recovery system is characterized in that,
the refrigerant recovery system as claimed in claim 10, comprising the steps of:
acquiring a control instruction;
when the control command is the refrigerant circulation purification,
and controlling the eighth controllable stop valve (18), the first controllable stop valve (7), the second controllable stop valve (8) and the third controllable stop valve (9) to be opened, and controlling the fourth controllable stop valve (10), the fifth controllable stop valve (11), the seventh controllable stop valve (17), the sixth controllable stop valve (15) and the first throttle valve (3) to be closed.
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