CN202973693U - Defroster used for air conditioning system and circulation energy source central air conditioning hot water system - Google Patents
Defroster used for air conditioning system and circulation energy source central air conditioning hot water system Download PDFInfo
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- CN202973693U CN202973693U CN201220494796.7U CN201220494796U CN202973693U CN 202973693 U CN202973693 U CN 202973693U CN 201220494796 U CN201220494796 U CN 201220494796U CN 202973693 U CN202973693 U CN 202973693U
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Abstract
The utility model discloses a defroster used for an air conditioning system. The defroster comprises a heat accumulator, wherein the heat accumulator is internally provided with two groups of heat exchangers which can output heat; the heat exchangers are respectively connected to an air conditioning system pipeline through pipelines; an outlet access point of a first heat exchanger is positioned between a compressor inlet and a four-way valve of the air conditioning system, and an inlet access point of the first heat exchanger is positioned between an indoor machine and an expansion valve; an outlet access point of a second heat exchanger is positioned between the four-way valve and an outdoor heat exchanger, and an inlet access point of the second heat exchanger is positioned between the indoor heat exchangers and the expansion valve; connecting pipelines of the first heat exchanger and the second heat exchanger are respectively connected in series with a control valve I and a control valve II; a control valve III is connected in series with the indoor heat exchangers and the expansion valve of an air conditioner circulating pipeline and is arranged between the inlet access points of the two heat exchangers; the heat accumulator is internally provided with a third heat exchanger used for introducing heat; the introduced heat is solar energy; and the energy utilization ratio is improved in a defrosting process, and the loss of an air conditioner is reduced.
Description
Technical field
The utility model relates to field of air conditioning, relates in particular to a kind of phase transformation defroster for air-conditioning system and uses the cycle energy central air-conditioning hot-water heating system of this defroster.
Background technology
Existing air-conditioning system is when carrying out heating operation, and the cold-producing medium of the outdoor heat exchanger of flowing through needs constantly to absorb airborne heat in gasification, and because environment temperature is lower, frost easily occurs outdoor heat exchanger.the existence of frosting greatly reduces the heat exchange efficiency of heat exchanger, makes overall performance descend, the existence of this kind phenomenon, can cause the impact that more strengthens in the central air-conditioning hot-water heating system, at present, in cycle energy central air-conditioning hot-water heating system, the Defrost mode that extensively adopts is reverse cycle defrosting mode and hot gas bypass defrosting mode, when defrosting, the reverse cycle defrosting mode require compressor first to shut down the docking of completion system high-low pressure, then cross valve commutation, restart again compressor and make system's antikinesis defrosting, the cross valve commutation not only increases wearing and tearing, produce noise, and compressor " is run quickly oily ", the frequency of defrosting is higher, the frequency of the commutation of start/stop of compressor and cross valve is also higher, greatly shortened the life-span of compressor and cross valve, cause pressure of inspiration(Pi) low because lacking low-temperature heat source when this kind mode defrosts, defrosting speed is slow, and when frosting is serious, defrosting is unclean, to make room temperature descend violent from heat supply room heat absorption during defrosting, when defrosting complete recovery heat supply, the sensation of blowing a cold wind over be arranged, greatly reduce indoor comfort.
The hot gas bypass defrosting mode is to utilize the heat of the high-temperature exhaust air of compressor, and defrosting time is long, and suction superheat is low, easily makes compressor return liquid, and simultaneously, high-temperature exhaust air pressure is high, compressor is produced certain impact, so the compressor security is also had considerable influence.
All there is certain drawback in above two kinds of Defrost modes, come defrost as need to control the frequent commutation of cross valve or hot-gas bypass mode in the process of defrosting, thereby can cause ambient temperature to descend, affect cross valve service life, there are simultaneously the series of problems such as the slow and energy consumption of defrosting speed is large.
Chinese patent literature CN102128528A discloses a kind of heat accumulating type defrost system for air source hot pump water heater, comprises compressor, gas-liquid separator, four-way change-over valve, outdoor heat exchanger, capillary, board-like phase change heat accumulator, Unidirectional solenoid valve, device for drying and filtering, the first stop valve, shower room, the second stop valve, external water tank heat exchanger, storage tank.Defrost process is by phase change heat accumulator, the condensation waste heat of heat pump water heater system and the waste water residual heat of shower room to be reclaimed, by turning to of four-way change-over valve, change cold-producing medium at the flow direction of board-like phase change heat accumulator and outdoor heat exchanger, realize system's energy strorage by using residual heat, release the conversion of function between defrosting.Although it has increased the method for using the waste water residual heat of condensation waste heat and shower room in defrost process, but it is not fundamentally solving the commutation that needs cross valve, and it can have influence on the heating efficiency of air-conditioning heating system in defrost process, causes the decline of room temperature.
The utility model content
The cycle energy central air-conditioning hot-water heating system that the purpose of this utility model is to propose a kind of phase transformation defroster for air-conditioning system and uses this defroster, central air-conditioning hot-water heating system and Defrost method thereof with the phase transformation defrost system, can improve defrosting efficiency, and the process that heats of central air-conditioning can not be affected, and can improve the comprehensive utilization ratio of the energy simultaneously.
For reaching this purpose, the utility model by the following technical solutions:
A kind of defroster for air-conditioning system, comprise storage heater, wherein, the heat exchanger of the built-in two groups of quantities of heat given up of described storage heater, access described air-conditioning system pipeline by pipeline respectively, wherein between compressor inlet and cross valve, First Heat Exchanger import access point is between indoor set and expansion valve in described air-conditioning system for First Heat Exchanger outlet access point; Described the second heat exchanger exit access point is between cross valve and outdoor heat exchanger, and the second heat exchanger import access point is between indoor heat exchanger and expansion valve; Be connected in series respectively control valve one and control valve two on the access pipeline of First Heat Exchanger and the second heat exchanger, and serial connection control valve three in the Air-conditioning Cycle pipeline between indoor heat exchanger and expansion valve, be installed between the import access point of two heat exchangers.
As a kind of preferred version of above-mentioned defroster, described air-conditioning system comprises compressor, cross valve, outdoor heat exchanger, expansion valve and indoor heat exchanger, connects and composes the refrigeration and heating closed circuit by pipeline.
As a kind of preferred version of above-mentioned defroster, the 3rd heat exchanger also is installed in described storage heater, be used for introducing heat.
As a kind of preferred version of above-mentioned defroster, described control valve one, control valve two and control valve three are magnetic valve.
As a kind of preferred version of above-mentioned defroster, the heat source of described storage heater is from solar heat-exchange station or electric heater.
As a kind of preferred version of above-mentioned defroster, the refrigerant that air-conditioning system adopts is R22 or R410A.
a kind of cycle energy central air-conditioning hot-water heating system, comprise air-conditioning system, described air-conditioning system comprises at least by compressor, cross valve, outdoor heat exchanger, the refrigeration and heating closed circuit that expansion valve and indoor heat exchanger connect and compose by pipeline, it is characterized in that, also comprise storage heater and apparatus for heating water by solar energy, the heat exchanger of the built-in two groups of quantities of heat given up of described storage heater, access described air-conditioning system pipeline by pipeline respectively, wherein First Heat Exchanger outlet access point is in described air-conditioning system between compressor inlet and cross valve, First Heat Exchanger import access point is between the indoor set expansion valve, described the second heat exchanger exit access point is between cross valve and outdoor heat exchanger, and the second heat exchanger import access point is between indoor heat exchanger and expansion valve, be connected in series respectively control valve one and control valve two on the access pipeline of First Heat Exchanger and the second heat exchanger, and serial connection control valve three in the Air-conditioning Cycle pipeline between indoor heat exchanger and expansion valve, be installed between the import access point of two heat exchangers, described apparatus for heating water by solar energy absorbs solar energy by solar heat-collection plate and is converted into heat energy in heat collection water tank, and this heat energy is used to described storage heater that heat energy is provided.
A kind of preferred version as above-mentioned a kind of cycle energy central air-conditioning hot-water heating system, also comprise water fluorine heat exchange unit, described water fluorine heat exchange unit heat input access compressor outlet and indoor heat exchanger outlet, its heat output loop is in parallel with the heat output loop of described apparatus for heating water by solar energy.
As a kind of preferred version of above-mentioned a kind of cycle energy central air-conditioning hot-water heating system, described heat output loop connects grounding heat coil tube and/or clothes drying device.
As a kind of preferred version of above-mentioned a kind of cycle energy central air-conditioning hot-water heating system, the heat collection water tank of described apparatus for heating water by solar energy connects domestic water system, is used for providing domestic water.
the beneficial effects of the utility model are: the utility model is by a kind of phase transformation defroster for air-conditioning system and use the cycle energy central air-conditioning hot-water heating system of this defroster, by increased phase change heat accumulator on the basis of existing cycle energy central air-conditioning hot-water heating system, and provide the energy by solar water heater or ground heating system for it, control by magnetic valve again, realized effective combination of phase change heat accumulator and cycle energy central air-conditioning hot-water heating system, and can utilize fully solar energy, the utilization that realizes resource maximizes, and in defrost process, do not need on the one hand indoor set to shut down, can realize indoor uninterrupted heating, neither need on the other hand start/stop of compressor to come the docking of completion system high-low pressure, do not need cross valve frequently to commutate yet, noise and " oil of running quickly " phenomenon of causing due to the cross valve commutation have been eliminated, extended the service life of compressor and cross valve, and after using phase change heat accumulator to carry out the hydrothermal solution accumulation of heat, as low-temperature heat source, greatly improved defrosting speed, reduce the defrosting energy consumption, improved the reliability of defrosting.
Description of drawings
Fig. 1 is the structural representation of the air-conditioning system with defroster that provides of the utility model specific embodiment;
Fig. 2 is the structural representation of the cycle energy hot-water heating system that provides of the utility model specific embodiment.
Wherein:
1: compressor; 2: cross valve; 3: outdoor heat exchanger; 4: reservoir; 5: indoor heat exchanger; 6: oil eliminator; 7: gas-liquid separator; 8: storage heater; 9: First Heat Exchanger; 10: control valve one; 11: the second heat exchangers; 12: control valve two; 13: the second heat exchangers; 14: control valve three; 15: solar panel; 16: solar heat exchanger; 17: water tank; 18: the domestic water place; 19: clothes drying device; 20: grounding heat coil tube; 21: water fluorine heat exchange unit; 22: expansion valve.
The specific embodiment
Further illustrate the technical solution of the utility model below in conjunction with accompanying drawing and by the specific embodiment.
As shown in Figure 1, a kind of defroster for air-conditioning system, it comprises storage heater 8, the heat exchanger of the built-in two groups of quantities of heat given up of this storage heater 8, access air-conditioning system pipeline by pipeline respectively, wherein between compressor 1 import and cross valve 2, First Heat Exchanger 9 import access points are between indoor set 5 and expansion valve 22 in air-conditioning system for First Heat Exchanger 9 outlet access points; The second heat exchanger 11 outlet access points are between cross valve 2 and outdoor heat exchanger 3, and the second heat exchanger 11 import access points are between indoor heat exchanger 5 and expansion valve 22; Be connected in series respectively control valve 1 and control valve 2 12 on the access pipeline of First Heat Exchanger 9 and the second heat exchanger 11, and serial connection control valve 3 14 in the Air-conditioning Cycle pipeline between indoor heat exchanger 5 and expansion valve 22, it is installed between the import access point of two heat exchangers, and above-mentioned control valve 1, control valve 2 12 and control valve 3 14 are magnetic valve.
air-conditioning freezes normally or heats in process, control valve 3 14 is opened, control valve 1 and control valve 2 12 are closed, when the outdoor heat exchanger of air-conditioning system produces long-pending frost, can open by controlling control valve 1 and control valve 2 12, control valve 3 14 is closed, by changing the circulating direction of cold-producing medium, make cold-producing medium after indoor heat exchanger 5 heat releases, enter the second heat exchanger 11 and absorb heat in storage heater by control valve 2 12, then entering outdoor heat exchanger 3 carries out heat release it is defrosted, again absorb heat in storage heater 8 by control valve 1 First Heat Exchanger 9 of flowing through at last, can make that the cold-producing medium after heat release is heated in outdoor heat exchanger 3.
The 3rd heat exchanger 13 also is installed in above-mentioned storage heater 8, it is that storage heater 8 carries out accumulation of heat that the 3rd heat exchanger 13 is used for quoting heat, while heat source in this application is from solar heat-exchange station 16 or electric heater, and equally also can adopt other thermal source is that storage heater 8 carries out accumulation of heat.
What adopt in storage heater 8 in this embodiment is the phase-transition heat-storage medium, and what wherein the phase-transition heat-storage medium adopted is organic material and/or inorganic material, certainly also can adopt other heat storage mediums in storage heater 8.
Above-mentioned air-conditioning system comprises at least by gas-liquid separator 7, compressor 2, oil eliminator 6, cross valve 2, indoor heat exchanger 5, reservoir 4, electric expansion valve 22 and outdoor heat exchanger 3 and connects and composes the refrigeration and heating closed circuit by pipeline, wherein indoor heat exchanger 5 is comprised of the indoor terminal machine of some groups of parallel connections, each indoor terminal machine comprises heat exchanger coils and the electric expansion valve of mutual series connection, and the refrigerant that adopts in air-conditioning system is R22 or R410A.
As shown in Figure 2, a kind of cycle energy central air-conditioning hot-water heating system that it provides for the application, comprise air-conditioning system, this air-conditioning system comprises the refrigeration and heating closed circuit that is connected and composed by gas-liquid separator 7, compressor 2, oil eliminator 6, cross valve 2, indoor heat exchanger 5, reservoir 4, electric expansion valve 22 and outdoor heat exchanger 3 at least; Wherein, cross valve 2 comprises the first valve port (a), the second valve port (b), the 3rd valve port (c) and the 4th valve port (d), and wherein, the first valve port is communicated with oil eliminator 6 by pipeline; The second valve port is communicated with gas-liquid separator 7 by pipeline; The 3rd valve port is communicated with outdoor heat exchanger 3 by pipeline; The 4th valve port is communicated with indoor heat exchanger 5 by pipeline.
Above-mentioned central air-conditioning hot-water heating system also comprises storage heater 8 and apparatus for heating water by solar energy, the heat exchanger of the built-in two groups of quantities of heat given up of storage heater 8, access air-conditioning system pipeline by pipeline respectively, wherein between compressor 1 import and cross valve 2, First Heat Exchanger 9 import access points are between indoor set heat exchanger 5 and expansion valve 22 in described air-conditioning system for First Heat Exchanger 9 outlet access points; Described the second heat exchanger 11 outlet access points are between cross valve 2 and outdoor heat exchanger 3, the second heat exchanger 11 import access points are between indoor heat exchanger 5 and expansion valve 22, the import access point of First Heat Exchanger 9 is near the close expansion valve 22 of the import access point of indoor heat exchanger 5, the second heat exchangers; Be connected in series respectively control valve 1 and control valve 2 12 on the access pipeline of First Heat Exchanger 9 and the second heat exchanger 11, and serial connection control valve 3 14 in the Air-conditioning Cycle pipeline between indoor heat exchanger 5 and expansion valve 22, be installed between the import access point of two heat exchangers.
Apparatus for heating water by solar energy absorbs solar energy by solar heat-collection plate 15 and is converted into heat energy in heat collection water tank 17, and this heat energy is used to described storage heater 8 that heat energy is provided; Apparatus for heating water by solar energy comprises solar heat-collection plate 15, solar heat-exchange station 16 and water tank 17, solar heat-collection plate 15 carries out exchange heat by heat conduction pipeline and solar heat-exchange station 16 and water tank 17, above-mentioned heat conduction pipeline comprises heat efferent duct and return duct, one end of this heat efferent duct and return duct all is communicated with solar heat-collection plate 15, their other end all passes solar heat-exchange station 16, and is communicated with coil pipe in being arranged on water tank 17.
The central air-conditioning hot-water heating system also comprises water fluorine heat exchange unit 21, the outlet of the input access compressor 1 of this water fluorine heat exchange unit 21 and indoor heat exchanger 5 outlets, in the utility model, the input of water fluorine heat exchange unit 21 is connected with pipeline between oil eliminator 6 and cross valve 2, its pipeline connection between end and indoor heat exchanger 5 and reservoir 4 that refluxes; Water fluorine heat exchange unit 21 heat output loops are in parallel with the heat output loop of apparatus for heating water by solar energy, and above-mentioned heat output loop connects grounding heat coil tube 20 and/or clothes drying device 19; The heat collection water tank 17 of apparatus for heating water by solar energy connects domestic water place 17, is used for providing domestic water.In the application in air conditioning and water heating system except providing heat by solar water heater for storage heater 8, can also utilize the waste heat of grounding heat coil tube 20, domestic water place 18 and clothes drying device 19 to provide heat for storage heater 8, the heat storage efficiency of storage heater can be further improved thus, and the utilization rate of the energy can be improved.
The application can take full advantage of extraneous thermal source (as solar energy) by adopting storage heater as defroster in air-conditioning system, but the normal refrigeration of air-conditioning or the process that heats are not affected, and in the application, the refrigerating/heating of air-conditioning comprises following process:
When refrigerating state, control valve three is opened, control valve one and control valve two are closed, the high-temperature high-pressure gas refrigerant that goes out compressor is flowed through after oil eliminator, cross valve successively, enter outdoor heat exchanger and be condensed into high-pressure sub-cooled liquid, then after passing through throttling and reservoir, enter indoor heat exchanger and carry out heat exchange, cold-producing medium became low-temp low-pressure gas and entered gas-liquid separator this moment, finally imported compressor;
When heating state, control valve three is opened, control valve one and control valve two are closed, the high-temperature high-pressure gas refrigerant that goes out compressor is flowed through after oil eliminator, cross valve successively, enter indoor heat exchanger and be condensed into subcooled liquid, then after passing through throttling and reservoir, enter outdoor heat exchanger and carry out heat exchange, cold-producing medium became low-temp low-pressure gas and entered gas-liquid separator this moment, finally imported compressor.
The Defrost method of cycle energy central air-conditioning hot-water heating system comprises the following steps:
Steps A: the accumulation of heat of phase change heat accumulator, solar heat-collection plate absorb solar energy, carry out heat exchange, the continual accumulation of heat work of carrying out storage heater simultaneously by transferring heat to water tank behind the solar heat-exchange station;
Step B: the defrost process of central air-conditioning, when outdoor heat exchanger of air conditioner produced a large amount of long-pending frost, central air-conditioning carried out following steps outdoor heat exchanger of air conditioner is defrosted;
Step a: control valve one and control valve two are opened, and control valve three is closed;
Step b: after the high-temperature high-pressure refrigerant gas that goes out compressor passes through oil eliminator, cross valve successively, enter indoor heat exchanger and carry out the condensation heat release, cold-producing medium enters reservoir after becoming 50 ℃ of left and right;
Step c: the cold-producing medium of completing indoor heat release is through after control valve two, then absorbs the heat that phase change heat accumulator stores when flowing through storage heater;
Steps d: after cold-producing medium absorbs the heat of storage heater storage, then enter the outdoor heat exchanger heat radiation by the outflow end of the second heat exchanger, outdoor heat exchanger is defrosted;
Step e: after outdoor heat exchanger was defrosted, cold-producing medium entered storage heater through control valve one by electric expansion valve, got back to compressor after the cold-producing medium outflow end by First Heat Exchanger enters gas-liquid separator at last.
In this step, storage heater being carried out accumulation of heat in steps A is a separate process with respect to the refrigeration of air-conditioning and the process that heats, and can not exert an influence to the refrigeration of air-conditioning and the process that heats.
Know-why of the present utility model has below been described in conjunction with specific embodiments.These are described just in order to explain principle of the present utility model, and can not be interpreted as by any way the restriction to the utility model protection domain.Based on explanation herein, those skilled in the art does not need to pay performing creative labour can associate other specific embodiment of the present utility model, within these modes all will fall into protection domain of the present utility model.
Claims (10)
1. defroster that is used for air-conditioning system, comprise storage heater, it is characterized in that, the heat exchanger of the built-in two groups of quantities of heat given up of described storage heater, access described air-conditioning system pipeline by pipeline respectively, wherein between compressor inlet and cross valve, First Heat Exchanger import access point is between indoor set and expansion valve in described air-conditioning system for First Heat Exchanger outlet access point; The second heat exchanger exit access point is between cross valve and outdoor heat exchanger, and the second heat exchanger import access point is between indoor heat exchanger and expansion valve; Be connected in series respectively control valve one and control valve two on the access pipeline of First Heat Exchanger and the second heat exchanger, and serial connection control valve three in the Air-conditioning Cycle pipeline between indoor heat exchanger and expansion valve, be installed between the import access point of two heat exchangers.
2. defroster according to claim 1, is characterized in that, described air-conditioning system comprises compressor, cross valve, outdoor heat exchanger, expansion valve and indoor heat exchanger, connects and composes the refrigeration and heating closed circuit by pipeline.
3. defroster according to claim 1, is characterized in that, the 3rd heat exchanger also is installed in described storage heater, is used for introducing heat.
4. defroster according to claim 1, is characterized in that, described control valve one, control valve two and control valve three are magnetic valve.
5. defroster according to claim 1, is characterized in that, the heat source of described storage heater is from solar heat-exchange station or electric heater.
6. defroster according to claim 1, is characterized in that, the refrigerant that air-conditioning system adopts is R22 or R410A.
7. cycle energy central air-conditioning hot-water heating system, comprise air-conditioning system, described air-conditioning system comprises at least by compressor, cross valve, outdoor heat exchanger, the refrigeration and heating closed circuit that expansion valve and indoor heat exchanger connect and compose by pipeline, it is characterized in that, also comprise storage heater and apparatus for heating water by solar energy, the heat exchanger of the built-in two groups of quantities of heat given up of described storage heater, access described air-conditioning system pipeline by pipeline respectively, wherein First Heat Exchanger outlet access point is in described air-conditioning system between compressor inlet and cross valve, First Heat Exchanger import access point is between the indoor set expansion valve, the second heat exchanger exit access point is between cross valve and outdoor heat exchanger, and the second heat exchanger import access point is between indoor heat exchanger and expansion valve, be connected in series respectively control valve one and control valve two on the access pipeline of First Heat Exchanger and the second heat exchanger, and serial connection control valve three in the Air-conditioning Cycle pipeline between indoor heat exchanger and expansion valve, be installed between the import access point of two heat exchangers, described apparatus for heating water by solar energy absorbs solar energy by solar heat-collection plate and is converted into heat energy in heat collection water tank, and this heat energy is used to described storage heater that heat energy is provided.
8. a kind of cycle energy central air-conditioning hot-water heating system according to claim 7, it is characterized in that, also comprise water fluorine heat exchange unit, described water fluorine heat exchange unit heat input access compressor outlet and indoor heat exchanger outlet, its heat output loop is in parallel with the heat output loop of described apparatus for heating water by solar energy.
9. cycle energy central air-conditioning hot-water heating system according to claim 8, is characterized in that, described heat output loop connects grounding heat coil tube and/or clothes drying device.
According to claim 7 to 9 described any cycle energy central air-conditioning hot-water heating system, it is characterized in that, the heat collection water tank of described apparatus for heating water by solar energy connects domestic water system, is used for providing domestic water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201220494796.7U CN202973693U (en) | 2012-09-21 | 2012-09-21 | Defroster used for air conditioning system and circulation energy source central air conditioning hot water system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201220494796.7U CN202973693U (en) | 2012-09-21 | 2012-09-21 | Defroster used for air conditioning system and circulation energy source central air conditioning hot water system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829588A (en) * | 2012-09-21 | 2012-12-19 | 青岛海尔空调电子有限公司 | Defroster used for air conditioning system and circulation energy source central air conditioning hot water system |
| CN109373453A (en) * | 2018-12-17 | 2019-02-22 | 珠海格力电器股份有限公司 | Air-conditioning system and control method |
-
2012
- 2012-09-21 CN CN201220494796.7U patent/CN202973693U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829588A (en) * | 2012-09-21 | 2012-12-19 | 青岛海尔空调电子有限公司 | Defroster used for air conditioning system and circulation energy source central air conditioning hot water system |
| CN102829588B (en) * | 2012-09-21 | 2015-11-25 | 青岛海尔空调电子有限公司 | For defroster and the cycle energy central air-conditioning hot-water heating system of air-conditioning system |
| CN109373453A (en) * | 2018-12-17 | 2019-02-22 | 珠海格力电器股份有限公司 | Air-conditioning system and control method |
| CN109373453B (en) * | 2018-12-17 | 2023-06-30 | 珠海格力电器股份有限公司 | Air conditioning system and control method |
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