CN109163469B - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN109163469B CN109163469B CN201811032194.8A CN201811032194A CN109163469B CN 109163469 B CN109163469 B CN 109163469B CN 201811032194 A CN201811032194 A CN 201811032194A CN 109163469 B CN109163469 B CN 109163469B
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- heat exchanger
- control device
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- conditioning system
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000003507 refrigerant Substances 0.000 claims abstract description 145
- 239000007788 liquid Substances 0.000 claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims description 44
- 238000011084 recovery Methods 0.000 claims description 26
- 230000001502 supplementing effect Effects 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims 1
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
Classifications
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B41/26—Disposition of valves, e.g. of on-off valves or flow control valves of fluid flow reversing 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02742—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two four-way 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/029—Control issues
- F25B2313/0292—Control issues related to reversing 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
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
Abstract
An air conditioning system, comprising: the first refrigerant circulation loop comprises an outdoor heat exchanger, a gas-liquid separator, a first compressor and an indoor heat exchanger which are arranged in series; and the second refrigerant circulation loop comprises a first heat exchanger, a throttling device, a second heat exchanger and a second compressor which are sequentially connected in series, wherein the second heat exchanger is arranged at the periphery and/or the bottom of the gas-liquid separator. The invention also provides a control method of the air conditioning system. The air conditioning system can be quickly heated and started in a low-temperature environment.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system and a control method thereof.
Background
And when the outdoor environment temperature is too low, the refrigerants in the air conditioning system are liquid, so that the refrigerants are difficult to flow, and the refrigerants need to enter circulation for a long time, so that the heating start of the air conditioning system is slower, and the user experience is affected.
Disclosure of Invention
Based on this, it is necessary to provide an air conditioning system and a control method thereof that are fast in heating start and good in user experience in a low-temperature environment, aiming at the problem that the heating start of the air conditioning system is slow in the low-temperature environment.
An air conditioning system, comprising:
the first refrigerant circulation loop comprises an outdoor heat exchanger, a gas-liquid separator, a first compressor and an indoor heat exchanger which are arranged in series;
the second refrigerant circulation loop comprises a first heat exchanger, a throttling device, a second heat exchanger and a second compressor which are sequentially connected in series, wherein the second heat exchanger is arranged at the periphery and/or the bottom of the gas-liquid separator.
In one embodiment, the first heat exchanger is disposed at the periphery and/or bottom of the first compressor.
In one embodiment, the second refrigerant circulation loop further includes a first control device, where the first control device is connected to the exhaust port M of the second compressor, the intake port N of the second compressor, the first heat exchanger, and the second heat exchanger, and the first heat exchanger is connected to the second heat exchanger;
the air conditioning system is provided with a refrigerant recovery mode and a rapid heating starting mode:
in the refrigerant recovery mode, the first refrigerant circulation loop stops running, and the first control device controls the exhaust port M of the second compressor to be communicated with the first heat exchanger and controls the air inlet N of the second compressor to be communicated with the second heat exchanger;
in the rapid heating start mode, the first refrigerant circulation loop starts to operate, the first control device controls the exhaust port M of the second compressor to be communicated with the second heat exchanger, and controls the air inlet N of the second compressor to be communicated with the first heat exchanger.
In one embodiment, the first refrigerant circulation loop further comprises a subcooler connected in series between the outdoor heat exchanger and the indoor heat exchanger, the second refrigerant circulation loop further comprises a second control device, the second control device is respectively connected with an air inlet N of the second compressor, the first control device and an air outlet of the subcooler, and the first control device is further connected with a medium-pressure cavity of the first compressor;
the second control device controls the air inlet N of the second compressor to be connected with the first control device in the refrigerant recovery mode and the rapid heating starting mode;
the air conditioning system is also provided with an air supplementing and enthalpy increasing mode, in the air supplementing and enthalpy increasing mode, the second control device controls the air inlet N of the second compressor to be communicated with the air outlet of the subcooler, and the first control device controls the air outlet M of the second compressor to be communicated with the medium-pressure cavity of the first compressor.
In one embodiment, the first control device comprises a first four-way valve, a valve port A of the first four-way valve is connected with an exhaust port M of the second compressor, a valve port B is connected with the second heat exchanger, a valve port C is connected with an air inlet N of the second compressor, and a valve port D is connected with the first heat exchanger;
in the refrigerant recovery mode, the valve port A is connected with the valve port D, and the valve port B is connected with the valve port C;
in the rapid heating starting mode, the valve port A is connected with the valve port B, and the valve port C is connected with the valve port D.
In one embodiment, the first control device further comprises a first three-way valve, wherein a valve port G of the first three-way valve is connected with a discharge port M of the second compressor, a valve port E is connected with the valve port a, and a valve port F is connected with a medium pressure cavity of the first compressor;
the valve port G is connected with the valve port E in the refrigerant recovery mode and the rapid heating starting mode;
in the air supplementing and enthalpy increasing mode, the valve port G is connected with the valve port F.
In one embodiment, the second control device comprises a second three-way valve, a valve port H of the second three-way valve is connected with an air inlet N of the second compressor, a valve port I is communicated with an air outlet of the subcooler (150), and a valve port J is connected with the first control device;
the valve port H is connected with the valve port J in the refrigerant recovery mode and the rapid heating starting mode;
in the air supplementing and enthalpy increasing mode, the valve port H is connected with the valve port I.
In one embodiment, the second refrigerant circulation circuit further includes:
the liquid storage tank is arranged between the first control device and the second control device;
the first switch device is arranged between the first control device and the liquid storage tank; and
and the second switch device is arranged between the second control device and the liquid storage tank.
A control method of the air conditioning system, comprising: when the first refrigerant circulation loop stops running, if the outdoor environment temperature is detected to be lower than a first preset temperature, the first control device controls the exhaust port M of the second compressor to be communicated with the first heat exchanger, and controls the air inlet N of the second compressor to be communicated with the second heat exchanger, so that the air conditioning system runs in the refrigerant recovery mode.
In one embodiment, when heating is required, the first refrigerant circulation loop is started, and the first control device controls the exhaust port M of the second compressor to be communicated with the second heat exchanger, and controls the air inlet N of the second compressor to be communicated with the first heat exchanger, so that the air conditioning system enters the rapid heating starting mode to operate.
In one embodiment, after the first refrigerant circulation loop operates steadily, the second control device controls the air inlet N of the second compressor to be communicated with the air outlet of the subcooler, and the first control device controls the air outlet M of the second compressor to be communicated with the medium-pressure cavity of the first compressor, so that the air conditioning system enters the air supplementing and enthalpy increasing mode to operate.
In one embodiment, before the step of communicating the second control device to control the air inlet N of the second compressor to the air outlet of the subcooler and the step of communicating the air outlet M of the first control device to the medium pressure chamber of the first compressor, the method further comprises: s1, closing the second switching device; and closing the first switching means (271) with a delay of a preset time.
The invention adds a second refrigerant circulation loop outside the main heating/refrigerating loop (namely the first refrigerant circulation loop) of the air conditioning system, and the second refrigerant circulation loop can exchange heat with the gas-liquid separator. When the outdoor environment temperature is lower and the first refrigerant circulation loop is heated and started, the refrigerant in the second refrigerant circulation loop can release heat at the gas-liquid separator, so that the liquid refrigerant in the gas-liquid separator is gasified quickly and enters the first refrigerant circulation loop to circulate, and the air conditioning system can heat quickly.
In addition, by arranging the first heat exchanger at the periphery and/or the bottom of the first compressor, when the outdoor environment temperature is lower and the outdoor unit is in a low-temperature environment, the refrigerant in the second refrigerant circulation loop can release heat at the first compressor and absorb heat at the gas-liquid separator, so that the liquid refrigerant stored in the first compressor is completely transferred into the gas-liquid separator, and when the first refrigerant circulation loop is started, the liquid impact phenomenon in the first compressor can be effectively avoided, and the reliability of the first compressor is improved.
According to the air conditioning system provided by the invention, the second compressor in the second refrigerant circulation loop can be connected into the first refrigerant circulation loop to form two-stage compression with the first compressor in the first refrigerant circulation loop, so that the air supplementing and enthalpy increasing are carried out on the first refrigerant circulation loop, and the heating capacity of the first refrigerant circulation loop is improved.
Drawings
FIG. 1 is a schematic diagram of an air conditioning system according to the present invention in a refrigerant recovery mode;
FIG. 2 is a schematic diagram of an air conditioning system according to the present invention in a rapid heating start mode;
fig. 3 is a schematic diagram of an air conditioning system provided by the invention in an air-supplementing enthalpy-increasing mode.
Detailed Description
The present invention will be further described in detail below with reference to examples, which are provided to illustrate the objects, technical solutions and advantages of the present invention. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 2, the present invention provides an air conditioning system, which includes a first refrigerant circulation loop and a second refrigerant circulation loop. The first refrigerant circulation loop includes an outdoor heat exchanger 110, a gas-liquid separator 120, a first compressor 130, and an indoor heat exchanger 140, which are disposed in series. The first refrigerant circulation loop is a main heating/cooling loop of the air conditioning system. The outdoor heat exchanger 110, the gas-liquid separator 120, the first compressor 130, and the indoor heat exchanger 140 can be connected in series to form a heating circuit. In an alternative embodiment, the outdoor heat exchanger 110, the gas-liquid separator 120, the first compressor 130, and the indoor heat exchanger 140 can also be connected in series to form a refrigeration circuit.
In one embodiment, the first refrigerant circulation circuit further includes a second four-way valve 160. The valve port T of the second four-way valve 160 is connected to the discharge port S of the first compressor 130. The valve port O of the second four-way valve 160 is connected to the first end of the indoor heat exchanger 140. The valve port P of the second four-way valve 160 is connected to the first end of the gas-liquid separator 120. The valve port Q of the second four-way valve 160 is connected to the first end of the outdoor heat exchanger 110. A second end of the indoor heat exchanger 140 is connected to a second end of the outdoor heat exchanger 110. The second end of the gas-liquid separator 120 is connected to the gas inlet S of the compressor. When the valve port T is connected to the valve port O and the valve port P is connected to the valve port Q, a heating cycle loop of the first compressor 130, the indoor heat exchanger 140, the outdoor heat exchanger 110, and the gas-liquid separator 120, which are sequentially connected in series in the refrigerant flow direction, is formed. When the valve port T is connected to the valve port Q and the valve port O is connected to the valve port P, a refrigeration cycle of the first compressor 130, the outdoor heat exchanger 110, the indoor heat exchanger 140, and the gas-liquid separator 120, which are sequentially connected in series in a refrigerant flow direction, is formed.
The specific arrangement of the first refrigerant circulation circuit is not limited to the above embodiment, as long as the air conditioning system can perform heating/cooling through the first refrigerant circulation circuit, for example, a subcooler 150 may be further disposed between the outdoor heat exchanger 110 and the indoor heat exchanger 140, the exhaust port of the first compressor 130 may be further connected to the oil separator 131, the refrigerant in the oil separator 131 may be further returned to the first compressor 130 through an oil return line, and a throttling device (such as an electronic expansion valve) may be further disposed on the first refrigerant circulation circuit.
The second refrigerant circulation circuit and the first refrigerant circulation circuit may be two circulation circuits independent of each other. The second refrigerant circulation loop may include a first heat exchanger 210, a throttling device 280, a second heat exchanger 220, and a second compressor 230, which are sequentially connected in series. The first heat exchanger 210 may be disposed at a periphery and/or a bottom of the first compressor 130. The second heat exchanger 220 may be disposed at the periphery and/or bottom of the gas-liquid separator 120.
In an embodiment, the second compressor 230, the second heat exchanger 220, the throttling device 280 and the first heat exchanger 210 can be further connected in series in the refrigerant flow direction. When the second compressor 230, the second heat exchanger 220, the throttling device 280 and the first heat exchanger 210 are sequentially connected in series in the refrigerant flow direction, the refrigerant in the second refrigerant circulation loop releases heat at the gas-liquid separator 120 through the second heat exchanger 220. This may be used for the heating start of the air conditioning system, that is, the heating start of the first refrigerant circulation circuit, so that the refrigerant stored in the gas-liquid separator 120 in the liquid form in the gas-liquid separator 120 is quickly gasified and enters the first refrigerant circulation circuit, so that the air conditioning system is quickly heated, and at this time, the air conditioning system is in a quick heating start mode.
In an embodiment, the first heat exchanger 210 may be disposed at a periphery and/or a bottom of the first compressor 130. The second compressor 230, the first heat exchanger 210, the throttling device 280, and the second heat exchanger 220 may be sequentially connected in series in a refrigerant flow direction. When the first refrigerant circulation circuit is stopped (for example, the four ports of the second four-way valve 160 are all opened), the second compressor 230, the first heat exchanger 210, the throttling device 280 and the second heat exchanger 220 are sequentially connected in series along the refrigerant flowing direction, so that the refrigerant in the second refrigerant circulation circuit releases heat at the first compressor 130 through the first heat exchanger 210, absorbs heat at the gas-liquid separator 120 through the second heat exchanger 220, so that the internal temperature of the first compressor 130 is higher than the ambient temperature, and the internal temperature of the gas-liquid separator 120 is lower than the ambient temperature, thereby transferring the liquid refrigerant stored in the first compressor 130 into the gas-liquid separator 120, and at this time, the air conditioning system is in the refrigerant recovery mode. When the outdoor environment temperature is low, the liquid refrigerant stored in the first compressor 130 can be completely transferred to the gas-liquid separator 120 by operating the air conditioning system in the refrigerant recovery mode, so that the phenomenon of liquid impact of the first compressor 130 when the first refrigerant circulation loop starts to operate is avoided, and the reliability of operation of the first compressor 130 is improved.
In one embodiment, the air conditioning system is switchable between the refrigerant recovery mode and the rapid heating start mode. The second refrigerant circulation circuit may further include a first control device 240. The first control device 240 may be connected to the discharge port M of the second compressor 230, the intake port N of the second compressor 230, the first heat exchanger 210, and the second heat exchanger 220, respectively. Referring to fig. 1, in the refrigerant recovery mode, the first control device 240 controls the exhaust port M of the second compressor 230 to communicate with the first heat exchanger 210, and controls the intake port N of the second compressor 230 to communicate with the second heat exchanger 220, so that the second compressor 230, the second heat exchanger 220 and the first heat exchanger 210 are sequentially connected in series along the refrigerant flow direction. Referring to fig. 2, in the rapid heating start mode, the first control device 240 controls the exhaust port M of the second compressor 230 to communicate with the second heat exchanger 220, and controls the intake port N of the second compressor 230 to communicate with the first heat exchanger 210, so that the second compressor 230, the first heat exchanger 210 and the second heat exchanger 220 are sequentially connected in series along the refrigerant flow direction.
In an embodiment, the first control device 240 may include a first four-way valve 241. The valve port a of the first four-way valve 241 may be connected to the discharge port M of the second compressor 230. Valve port B of the first four-way valve 241 may be connected to the second heat exchanger 220. The valve port C of the first four-way valve may be connected to the intake port N of the second compressor 230. The valve port D of the first four-way valve may be connected to the first heat exchanger 210. In the refrigerant recovery mode, the valve port a may be connected to the valve port D so that the exhaust port M of the second compressor 230 communicates with the first heat exchanger 210; the valve port C may communicate with the valve port B such that the inlet N of the second compressor 230 is connected to the second heat exchanger 220. In the rapid heating start mode, the valve port a may be connected to the valve port B so as to communicate the exhaust port M of the second compressor 230 with the second heat exchanger 220; the valve port C may be connected to the valve port D so that the inlet N of the second compressor 230 communicates with the first heat exchanger 210.
In an embodiment, the air conditioning system may further have a supplemental air enthalpy mode. Specifically, the first control device 240 may be further connected to the medium pressure chamber of the first compressor 130. The second refrigerant circulation circuit may further include a second control device. The second control device may be connected to the inlet N of the second compressor 230, the first control device 240, and the outlet of the subcooler 150, respectively. In the refrigerant recovery mode and the rapid heating start mode, the second control device may control the air inlet N of the second compressor 230 to be connected with the first control device 240. Referring to fig. 3, in the air-supplementing enthalpy-increasing mode, the second control device may control the air inlet N of the second compressor 230 to communicate with the air outlet of the subcooler 150, and the first control device 240 may control the air outlet M of the second compressor 230 to communicate with the medium-pressure chamber of the first compressor. At this time, the second compressor 230 is connected to the first refrigerant circulation circuit, and the gas refrigerant discharged from the subcooler 150 may enter the second compressor 230 for primary compression and then enter the first compressor 130 for secondary compression, so that the refrigerant in the first refrigerant circulation circuit is secondarily compressed, and the low-temperature heating capacity of the air conditioning system may be significantly improved. The air supplementing and enthalpy increasing mode can be entered after the first refrigerant circulation loop is stable in operation, for example, the air supplementing and enthalpy increasing mode can be directly switched from the rapid heating starting mode after the first refrigerant circulation loop is stable in operation.
In an embodiment, the first control device 240 may further include a first three-way valve 242. The valve port G of the first three-way valve 242 may be connected to the discharge port M of the second compressor 230. The port E of the first three-way valve 242 may be connected to the port a of the first four-way valve 241. The valve port F of the first three-way valve 242 may be connected to the intermediate pressure chamber of the first compressor 130. In the refrigerant recovery mode and the rapid heating start mode, the valve port G may be connected to the valve port E such that the exhaust port M of the second compressor 230 communicates with the valve port a of the first four-way valve 241. In the air-supplementing and enthalpy-increasing mode, the valve port G may be connected to the valve port F, so that the exhaust port M of the second compressor 230 communicates with the medium pressure chamber of the first compressor 130.
In an embodiment, the second control device may include a second three-way valve 250. The valve port H of the second three-way valve 250 may be connected to the inlet N of the second compressor 230. The valve port I of the second three-way valve 250 may be connected to the exhaust port of the subcooler 150. The port G of the second three-way valve 250 may be connected to the first control device 240, for example, the port C of the first four-way valve. In the refrigerant recovery mode and the rapid heating start mode, the valve port H is connected to the valve port C, so that the inlet N of the second compressor 230 is connected to the first control device 240. In the air-supplementing enthalpy-increasing mode, the valve port H is connected to the valve port I, so that the air inlet N of the second compressor 230 communicates with the air outlet of the subcooler 150.
In an embodiment, the second refrigerant circulation circuit may further include a liquid storage tank 260 disposed between the first control device 240 and the second control device. A first switching device 271 may be provided between the liquid storage tank 260 and the first control device 240. A second switching device 272 may be provided between the reservoir 260 and the second control device. When the air conditioning system is switched from the rapid heating start mode to the air-supplementing enthalpy-increasing mode, the second switch device 272 may be turned off first, the first switch device 271 may be turned off after the refrigerant in the second refrigerant circulation loop completely enters the liquid storage tank 260, and finally the second compressor 230 may be connected to the first refrigerant circulation loop under the switching of the first control device 240 and the second control device. By doing so, the refrigerant in the first refrigerant circulation loop and the refrigerant in the second refrigerant circulation loop can circulate independently and independently without affecting each other. The liquid storage tank 260 may be disposed between the port C of the first four-way valve 241 and the port G of the second three-way valve 250. The first switching means 271 and/or the second switching means 272 may be solenoid valves.
In an embodiment, the first heat exchanger 210 and the second heat exchanger 220 may be heat exchange coils. The throttle device 280 may be an electronic expansion valve.
The invention also provides a control method of the air conditioning system, which comprises the following steps: when the air conditioning system is on standby, i.e., when the first refrigerant circulation circuit is stopped (for example, when all four ports of the second four-way valve 160 are opened), if the outdoor ambient temperature is detected to be lower than a first preset temperature, the first control device 240 controls the air outlet M of the second compressor 230 to communicate with the first heat exchanger 210, and controls the air inlet N of the second compressor 230 to communicate with the second heat exchanger 220, so that the air conditioning system is operated in the refrigerant recovery mode. The first preset temperature may be set according to actual requirements, for example, may be set to-20 degrees celsius. The air conditioning system can operate for a preset time t1 in the refrigerant recovery mode. The preset time t1 may be a time for the cooling medium in the first compressor 130 to be entirely transferred to the gas-liquid separator 120 in the cooling medium recovery mode.
Further, when heating is required, the first refrigerant circulation circuit may be started, and the first control device 240 may control the exhaust port M of the second compressor 230 to communicate with the second heat exchanger 220, and control the intake port N of the second compressor 230 to communicate with the first heat exchanger 210, so that the air conditioning system enters the rapid heating start mode.
Further, after the operation of the first refrigerant circulation loop is stable, the second control device may control the air inlet N of the second compressor 230 to be communicated with the air outlet of the subcooler 150, so that the first control device may control the air outlet M of the second compressor 230 to be communicated with the medium-pressure cavity of the first compressor 130, thereby enabling the air conditioning system to enter the air-supplementing enthalpy-increasing mode.
Further, before the second control device controls the air inlet N of the second compressor 230 to communicate with the air outlet of the subcooler 150 and the first control device controls the air outlet M of the second compressor 230 to communicate with the medium pressure chamber of the first compressor 130, that is, when the rapid heating start mode is switched to the air-supplementing enthalpy-increasing mode, the method may further include the following steps: s1, closing the second switching device 272; and S2, turning off the first switching device 271 for a predetermined time t 2. The preset time t2 may be a time for the refrigerant in the second refrigerant circulation circuit to entirely enter the liquid storage tank 260. By doing so, the refrigerant in the second refrigerant circulation loop and the refrigerant in the first refrigerant circulation loop are not interfered with each other when the second compressor is connected to the first refrigerant circulation loop.
In the invention, a second refrigerant circulation loop is added outside a main heating/refrigerating loop (namely a first refrigerant circulation loop) of the air conditioning system, and the second refrigerant circulation loop can exchange heat with a first compressor and a gas-liquid separator on the first refrigerant circulation loop respectively. When the outdoor environment temperature is lower and the outdoor unit is in a low-temperature environment, the refrigerant in the second refrigerant circulation loop can be enabled to release heat at the first compressor and absorb heat at the gas-liquid separator, so that liquid refrigerant stored in the first compressor is completely transferred to the gas-liquid separator, when the first refrigerant circulation loop is started, the phenomenon of liquid impact in the first compressor can be effectively avoided, and the reliability of the first compressor is improved. In addition, when the outdoor environment temperature is lower and the first refrigerant circulation loop is started for heating, the refrigerant in the second refrigerant circulation loop can release heat at the gas-liquid separator, so that the liquid refrigerant in the gas-liquid separator is gasified rapidly and enters the first refrigerant circulation loop for circulation, and the air conditioning system can heat rapidly.
According to the air conditioning system provided by the invention, the second compressor in the second refrigerant circulation loop can be connected into the first refrigerant circulation loop to form two-stage compression with the first compressor in the first refrigerant circulation loop, so that the air supplementing and enthalpy increasing are carried out on the first refrigerant circulation loop, and the heating capacity of the first refrigerant circulation loop is improved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (12)
1. An air conditioning system, comprising:
a first refrigerant circulation circuit including an outdoor heat exchanger (110), a gas-liquid separator (120), a first compressor (130) and an indoor heat exchanger (140) arranged in series; and
the second refrigerant circulation loop comprises a first heat exchanger (210), a throttling device (280), a second heat exchanger (220) and a second compressor (230) which are sequentially connected in series, wherein the second heat exchanger (220) is arranged at the periphery and/or the bottom of the gas-liquid separator (120);
the second refrigerant circulation loop further comprises a first control device (240), wherein the first control device (240) is respectively connected with an exhaust port M of the second compressor (230), an air inlet N of the second compressor (230), the first heat exchanger (210) and the second heat exchanger (220), and the first heat exchanger (210) is connected with the second heat exchanger (220);
the air conditioning system is provided with a rapid heating starting mode, in the rapid heating starting mode, the first refrigerant circulation loop starts to operate, the first control device (240) controls the exhaust port M of the second compressor (230) to be communicated with the second heat exchanger (220), and controls the air inlet N of the second compressor (230) to be communicated with the first heat exchanger (210).
2. The air conditioning system according to claim 1, characterized in that the first heat exchanger (210) is arranged at the periphery and/or at the bottom of the first compressor (130).
3. The air conditioning system according to claim 2, further comprising a refrigerant recovery mode:
in the refrigerant recovery mode, the first refrigerant circulation circuit stops operating, the first control device (240) controls the exhaust port M of the second compressor (230) to be communicated with the first heat exchanger (210), and controls the air inlet N of the second compressor (230) to be communicated with the second heat exchanger (220).
4. An air conditioning system according to claim 3, characterized in that the first refrigerant circulation circuit further comprises a subcooler (150) connected in series between the outdoor heat exchanger (110) and the indoor heat exchanger (140), the second refrigerant circulation circuit further comprises a second control device connected to the air inlet N of the second compressor (230), the first control device (240) and the air outlet of the subcooler (150), respectively, the first control device (240) being further connected to the medium pressure chamber of the first compressor (130);
in the refrigerant recovery mode and the rapid heating start mode, the second control device controls the air inlet N of the second compressor (230) to be connected with the first control device (240);
the air conditioning system further has an air supplementing and enthalpy increasing mode, in which the second control device controls the air inlet N of the second compressor (230) to be communicated with the air outlet of the subcooler (150), and the first control device (240) controls the air outlet M of the second compressor (230) to be communicated with the medium-pressure cavity of the first compressor (130).
5. The air conditioning system according to claim 4, wherein the first control device (240) includes a first four-way valve (241), a port a of the first four-way valve (241) is connected to an exhaust port M of the second compressor (230), a port B is connected to the second heat exchanger (220), a port C is connected to an intake port N of the second compressor (230), and a port D is connected to the first heat exchanger (210);
in the refrigerant recovery mode, the valve port A is connected with the valve port D, and the valve port B is connected with the valve port C;
in the rapid heating starting mode, the valve port A is connected with the valve port B, and the valve port C is connected with the valve port D.
6. The air conditioning system according to claim 5, wherein the first control device (240) further comprises a first three-way valve (242), a valve port G of the first three-way valve (242) being connected to the exhaust port M of the second compressor (230), a valve port E being connected to the valve port a, a valve port F being connected to the medium pressure chamber of the first compressor (130);
the valve port G is connected with the valve port E in the refrigerant recovery mode and the rapid heating starting mode;
in the air supplementing and enthalpy increasing mode, the valve port G is connected with the valve port F.
7. The air conditioning system according to claim 4, characterized in that the second control means comprises a second three-way valve (250), a valve port H of the second three-way valve (250) being connected to an air intake N of the second compressor (230), a valve port I being in communication with an air discharge of the subcooler (150), a valve port J being connected to the first control means (240);
the valve port H is connected with the valve port J in the refrigerant recovery mode and the rapid heating starting mode;
in the air supplementing and enthalpy increasing mode, the valve port H is connected with the valve port I.
8. The air conditioning system of claim 4, wherein the second refrigerant circulation circuit further comprises:
a liquid storage tank (260) provided between the first control device (240) and the second control device;
a first switching device (271) provided between the first control device (240) and the liquid storage tank (260); and
and a second switching device (272) provided between the second control device and the liquid storage tank (260).
9. A control method of an air conditioning system, characterized by being used for the air conditioning system according to any one of claims 4 to 8, comprising:
when the first refrigerant circulation loop stops operating, if the outdoor environment temperature is detected to be lower than a first preset temperature, the first control device (240) controls the exhaust port M of the second compressor (230) to be communicated with the first heat exchanger (210), and controls the air inlet N of the second compressor (230) to be communicated with the second heat exchanger (220), so that the air conditioning system operates in the refrigerant recovery mode.
10. The control method of an air conditioning system according to claim 9, characterized in that when heating is required, the first refrigerant circulation circuit is started, while the first control device (240) controls the exhaust port M of the second compressor (230) to communicate with the second heat exchanger (220), and controls the intake port N of the second compressor (230) to communicate with the first heat exchanger (210), thereby causing the air conditioning system to enter the rapid heating start mode operation.
11. The method according to claim 10, wherein when the first refrigerant circulation circuit is operating smoothly, the second control device controls the air inlet N of the second compressor (230) to communicate with the air outlet of the subcooler (150), and the first control device (240) controls the air outlet M of the second compressor (230) to communicate with the medium pressure chamber of the first compressor (130), thereby causing the air conditioning system to enter the air-supplementing enthalpy-increasing mode of operation.
12. The method according to claim 11, wherein the second refrigerant cycle further includes a liquid tank (260) provided between the first control device (240) and the second control device, a first switching device (271) provided between the first control device (240) and the liquid tank (260), and a second switching device (272) provided between the second control device and the liquid tank (260), and further comprising, before the step of communicating the second control device to control the intake port N of the second compressor (230) and the exhaust port of the subcooler (150) and communicating the exhaust port M of the first control device (240) to control the second compressor (230) and the medium pressure chamber of the first compressor (130), the step of:
s1, closing the second switching device (272); and
s2, closing the first switching device (271) by delaying for a preset time.
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| CN109682106B (en) * | 2019-02-12 | 2024-01-23 | 珠海格力电器股份有限公司 | Refrigerant circulation system for slowing down surge of compressor, control method thereof and air conditioner |
| CN109990500A (en) * | 2019-03-04 | 2019-07-09 | 南京天加环境科技有限公司 | A kind of combustion-gas thermal pump air-conditioning system that preventing back liquid and its control method |
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