CN102818406A - Refrigerant recovery device and method of heat pump of air-conditioner and outdoor unit of air-conditioner - Google Patents
Refrigerant recovery device and method of heat pump of air-conditioner and outdoor unit of air-conditioner Download PDFInfo
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- CN102818406A CN102818406A CN2012102994563A CN201210299456A CN102818406A CN 102818406 A CN102818406 A CN 102818406A CN 2012102994563 A CN2012102994563 A CN 2012102994563A CN 201210299456 A CN201210299456 A CN 201210299456A CN 102818406 A CN102818406 A CN 102818406A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
Abstract
The invention discloses a refrigerant recovery device and a method of a heat pump of an air-conditioner and an outdoor unit of the air-conditioner. The recovery device comprises a compressor, a multiported valve, an outdoor heat exchanger, a gas-liquid separator, a throttling part, a liquid side stop valve and a gas side stop valve. The output end of the compressor is respectively connected with the outdoor heat exchanger and the gas side stop valve through the multiported valve. The input end of the compressor is connected with the gas-liquid separator which is connected with the gas side stop valve through the multiported valve. The outdoor heat exchanger is connected with the liquid side stop valve through the throttling part and the liquid side stop valve is connected with the gas side stop valve through a junction pipe. According to the invention, the junction pipe connects the liquid side stop valve with the gas side stop valve in the outdoor unit of the air-conditioner, therefore, not only is refrigerating and heating test run detection of the outdoor unit on a production line guaranteed, but also the refrigerant recovery effect of the outdoor unit is guaranteed so that the reliability of the outdoor unit is further improved. For the outdoor unit with large groundwater recharge, the refrigerant recovery time is shortened and the production efficiency is improved greatly.
Description
Technical field
The present invention relates to air-conditioning technical field, relate in particular to a kind of air-conditioning heat pump refrigerant recovering device, method and air-conditioner outdoor unit.
Background technology
Generally, the split-type air conditioner off-premises station needs to connect indoor set and on production line, freezes, heats the test running detection after assembling is accomplished on the production line.After test running detects completion, need be the refrigerant recovering in the system to off-premises station.
Existing refrigerant recovering device comprises: off-premises station, indoor set, indoor and outdoor machine tube connector and low pressure checkout gear (Pressure gauge or pressure sensor), wherein:
With the refrigeration mode is example, and the refrigerant recovering process is roughly: the running refrigerating pattern, earlier liquid side stop valve is closed; Compressor enters condenser with the compression of the refrigerant in indoor set and the connecting line thereof, when condenser is enough big, can the refrigerant in the whole system all be recycled to outdoor condenser; Detect low pressure (checking pressure gauge reading or pressure value detected) through the low pressure checkout gear; After low pressure reaches setting value, close the side stop valve of holding one's breath, refrigerant recovering finishes.
But; When adopting the very little heat exchanger of heat exchange volumes such as sleeve pipe, plate type heat exchanger or microchannel when air-conditioning equipment as outdoor heat exchanger; Because the volume of these heat exchangers is less,, in reclaiming the refrigerant process, be easy to occur the protection of too high protection of pressure at expulsion or excessive discharge temperature as still adopting such scheme; Thereby cause refrigerant recovering not thorough, and can influence the reliability of off-premises station.
Summary of the invention
Main purpose of the present invention is to provide a kind of air-conditioning heat pump refrigerant recovering device, method and air-conditioner outdoor unit; When realizing that air-conditioner outdoor unit being heated/freeze test running detects; Improve off-premises station refrigerant recovering effect, and then improve the reliability of off-premises station.
In order to achieve the above object; The present invention proposes a kind of air-conditioning heat pump refrigerant recovering device; Comprise compressor, multiple-way valve, outdoor heat exchanger, gas-liquid separator, throttle part, liquid side stop valve and gas side stop valve, the output of said compressor is through the gentle side stop valve of said multiple-way valve difference junction chamber external heat exchanger; The input of compressor connects gas-liquid separator, and gas-liquid separator connects gas side stop valve through said multiple-way valve; Outdoor heat exchanger connects liquid side stop valve through said throttle part, between said liquid side stop valve and the gas side stop valve through being connected the short tube connection.
Preferably, this device also comprises the controller that is used to control said liquid side stop valve and the open and close of gas side stop valve, and when refrigeration mode recover refrigerant, said controller is used for successively cutting out said liquid side stop valve and gas side stop valve; When heating mode recover refrigerant, said controller is used for successively cutting out said gas side stop valve and liquid side stop valve.
Preferably, said multiple-way valve is a cross valve.
The present invention also proposes a kind of air-conditioner outdoor unit; Comprise: compressor, multiple-way valve, outdoor heat exchanger, gas-liquid separator, throttle part, liquid side stop valve and gas side stop valve, the output of said compressor is through the gentle side stop valve of said multiple-way valve difference junction chamber external heat exchanger; The input of compressor connects gas-liquid separator, and gas-liquid separator connects gas side stop valve through said multiple-way valve; Outdoor heat exchanger connects liquid side stop valve through said throttle part, said air-conditioner outdoor unit is being heated/freeze test running when detecting, between said liquid side stop valve and the gas side stop valve through being connected the short tube connection.
Preferably,, said multiple-way valve is a cross valve.
The present invention also proposes a kind of air-conditioning heat pump refrigerant recovering method, may further comprise the steps:
Be connected with gas side stop valve through the liquid side stop valve of connection short tube air-conditioner outdoor unit;
After off-premises station heats/freeze test running detection end, close the gentle side stop valve of said liquid side stop valve with predetermined sequencing and carry out refrigerant recovering.
Preferably, saidly close the step that the gentle side stop valve of said liquid side stop valve carries out refrigerant recovering with predetermined sequencing and comprise:
When refrigeration mode recover refrigerant, successively close said liquid side stop valve and gas side stop valve;
When heating mode recover refrigerant, successively close said gas side stop valve and liquid side stop valve.
A kind of air-conditioning heat pump refrigerant recovering device, method and air-conditioner outdoor unit that the present invention proposes; Through connecting short tube the liquid side stop valve in the air-conditioner outdoor unit is connected with gas side stop valve; Not only can guarantee off-premises station in the refrigeration of production line, heat trial run and detect; Can guarantee simultaneously the effect that the off-premises station refrigerant reclaims again, and then improve the reliability of off-premises station, solve the problem that existing scheme can't all be recovered to refrigerant the less outdoor heat exchanger of volume; And, can also shorten the refrigerant recovering time greatly for the big off-premises station of groundwater increment.
Description of drawings
Fig. 1 is the structural representation of air-conditioning heat pump refrigerant recovering device of the present invention preferred embodiment;
Fig. 2 flows to sketch map to the air-conditioner outdoor unit refrigerant of trial run when detecting that freeze in the air-conditioning heat pump refrigerant recovering device of the present invention preferred embodiment;
Fig. 3 heats the refrigerant of trial run when detecting to air-conditioner outdoor unit in the air-conditioning heat pump refrigerant recovering device of the present invention preferred embodiment to flow to sketch map;
Fig. 4 is the schematic flow sheet of air-conditioning heat pump refrigerant recovering method of the present invention preferred embodiment.
In order to make technical scheme of the present invention clearer, clear, will combine accompanying drawing to do further to detail below.
The specific embodiment
The solution of the embodiment of the invention mainly is: the solution that proposes to move test in the split-type air conditioner off-premises station production process and reclaim refrigerant; Directly the liquid side stop valve in the air-conditioner outdoor unit is connected with gas side stop valve through connecting short tube; Make off-premises station in the refrigeration of production line, when heating the trial run detection; Need not to connect indoor set, can guarantee the effect that the off-premises station refrigerant reclaims simultaneously again, and then improve the reliability of off-premises station.
As shown in Figure 1, Fig. 1 is the structural representation of air-conditioning heat pump refrigerant recovering device of the present invention preferred embodiment.
A kind of air-conditioning heat pump refrigerant recovering device that present embodiment proposes; Not only can realize air-conditioner outdoor unit in the refrigeration of production line, heat trial run and detect; Can solve simultaneously off-premises station again in the refrigerant recovering of freezing, heating after trial run detecting completion; This air-conditioning heat pump refrigerant recovering device comprises compressor 1, multiple-way valve, outdoor heat exchanger 4, gas-liquid separator 3, throttle part 5, liquid side stop valve 6 and gas side stop valve 7, and the output of said compressor 1 is through said multiple-way valve difference junction chamber external heat exchanger 4 gentle side stop valves 7; The input of compressor 1 connects gas-liquid separator 3, and gas-liquid separator 3 connects gas side stop valve 7 through said multiple-way valve; Outdoor heat exchanger 4 connects liquid side stop valves 6 through said throttle part 5, between said liquid side stop valve 6 and the gas side stop valve 7 through being connected short tube 8 connections.
Particularly; Multiple-way valve adopts cross valve 2 in the present embodiment; This cross valve 2 has first end, second end, the 3rd end and the 4th end, and the output of compressor 1 connects first end of cross valve 2, and second end of cross valve 2 connects gas side stop valve 7; The 3rd end of cross valve 2 connects the input of gas-liquid separator 3, and the output of gas-liquid separator 3 connects the input of compressor 1; One end of the outdoor heat exchanger 4 that the 4th end of cross valve 2 connects, the other end of outdoor heat exchanger 4 connects liquid side stop valve 6 through throttle part 5.
With little chamber volume external heat exchanger 4 is example; When air-conditioner outdoor unit being freezed, heating the trial run detection; At first adopt to connect short tube 8 liquid side stop valve 6 gentle side stop valves 7 connected, to system vacuumize finish after, (like outdoor heat exchanger 4 volumes is 2L in system, to fill the coolant quantity that little chamber volume external heat exchanger 4 can store; Then can in system, fill the refrigerant of 2Kg), start is carried out system's refrigeration, is heated the trial run detection then.
As shown in Figure 2, Fig. 2 flows to sketch map to the air-conditioner outdoor unit refrigerant of trial run when detecting that freeze in the present embodiment, and refrigerant flows to shown in arrow among Fig. 2.
When carrying out off-premises station refrigeration trial run detection; Refrigerant process cross valve 2 inlet chamber external heat exchangers 4 condensations from compressor 1 discharge; The liquid refrigerants that comes out from outdoor heat exchanger 4 passes through throttle part 5 throttlings; Through liquid side stop valve 6, connection short tube 8, gas side stop valve 7, cross valve 2, gas-liquid separator 3 and evaporation in these parts tube connectors and gas-liquid separator 3, the gas after the evaporation gets into compressor 1 again.Can realize the normal refrigerating operaton of off-premises station under the situation that does not connect indoor set with cocycle, realize that thus the trial run of air-conditioner outdoor unit refrigeration detects.
Further, after accomplishing air-conditioner outdoor unit refrigeration trial run detection, need be in outdoor heat exchanger 4 the refrigerant recovering in the system.
Operation at above-mentioned refrigerating operaton pattern recover refrigerant is following: at first close liquid side stop valve 6, close the side stop valve 7 of holding one's breath then at once and can accomplish the refrigerant recovering process.More than operation can be shortened the refrigerant recovering time greatly, improves Production Line efficient.
As shown in Figure 3, Fig. 3 heats the refrigerant of trial run when detecting to air-conditioner outdoor unit in the present embodiment to flow to sketch map, and refrigerant flows to shown in arrow among Fig. 3.
Heat trial run when detecting carrying out off-premises station; The refrigerant of discharging from compressor 1 gets into throttle parts 5 throttlings through cross valve 2, gas side stop valve 7, connection short tube 8, liquid side stop valve 6; Inlet chamber external heat exchanger 4 heat exchange evaporation then, the gas after the evaporation gets into compressor 1 through cross valve 2 and gas-liquid separator 3.Can realize off-premises station normal heating operation under the situation that does not connect indoor set with cocycle.
Further, after accomplishing air-conditioner outdoor unit refrigeration trial run detection, need be in outdoor heat exchanger 4 the refrigerant recovering in the system.
Operation at above-mentioned heating operation pattern recover refrigerant is following: at first close the survey stop valve of holding one's breath, close liquid side stop valve 6 then and can accomplish the refrigerant recovering process at once.
Further; In the practical implementation process; Can also control the open and close of said liquid side stop valve 6 and gas side stop valve 7 through the controller in the off-premises station automatically; Particularly, when refrigeration mode recover refrigerant, successively close said liquid side stop valve 6 and gas side stop valve 7 through controller; When heating mode recover refrigerant, successively close said gas side stop valve 7 and liquid side stop valve 6 through controller.Realize the refrigerant recovering of off-premises station under two kinds of running statuses thus.
Compare prior art, the protection of too high protection of pressure at expulsion or excessive discharge temperature appears in the outdoor heat exchanger 4 easily less to volume in reclaiming the refrigerant process; Cause refrigerant recovering not thorough, and can influence the reliability of off-premises station, present embodiment is connected the liquid side stop valve 6 in the air-conditioner outdoor unit through connecting short tube 8 with gas side stop valve 7; Need not connect indoor set; Not only can guarantee off-premises station in the refrigeration of production line, heat trial run and detect, can guarantee the effect that the off-premises station refrigerant reclaims simultaneously again, and then improve the reliability of off-premises station; Solved the problem that existing scheme can't all be recovered to refrigerant the less outdoor heat exchanger 4 of volume; And, can also shorten the refrigerant recovering time greatly for the big off-premises station of groundwater increment, enhance productivity.
In addition; The present invention also proposes a kind of air-conditioner outdoor unit; Can be with reference to shown in Figure 1; This air-conditioner outdoor unit comprises: compressor 1, cross valve 2, outdoor heat exchanger 4, gas-liquid separator 3, throttle part 5, liquid side stop valve 6 and gas side stop valve 7, and the output of said compressor 1 is through said cross valve 2 difference junction chamber external heat exchangers 4 gentle side stop valves 7; The input of compressor 1 connects gas-liquid separator 3, and gas-liquid separator 3 connects gas side stop valve 7 through said cross valve 2; Outdoor heat exchanger 4 connects liquid side stop valves 6 through said throttle part 5, said air-conditioner outdoor unit is being heated/freeze test running when detecting, between said liquid side stop valve 6 and the gas side stop valve 7 through being connected short tube 8 connections.The design feature of the air-conditioner outdoor unit of present embodiment can repeat no more at this with reference to the foregoing description, and wherein, cross valve 2 can also adopt other multiple-way valves.
As shown in Figure 4, the present invention also proposes a kind of air-conditioning heat pump refrigerant recovering method, implements based on the air-conditioning heat pump refrigerant recovering device in the foregoing description, and this method comprises:
Step S101 is connected with gas side stop valve through the liquid side stop valve of connection short tube with air-conditioner outdoor unit;
When air-conditioner outdoor unit being freezed, heating the trial run detection; At first adopt and connect short tube the gentle side stop valve connection of liquid side stop valve; To system vacuumize finish after; In system, fill the coolant quantity (like the outdoor heat exchanger volume is 2L, then can in system, fill the refrigerant of 2Kg) that little chamber volume external heat exchanger can be stored, start is carried out system's refrigeration, is heated the trial run detection then.
Present embodiment is connected the liquid side stop valve of air-conditioner outdoor unit through connecting short tube with gas side stop valve, in the refrigeration of accomplishing the air-conditioner outdoor unit production line, heat try detection out after, can realize the refrigerant recovering of off-premises station.
Step S102 when off-premises station heats/freezes after test running detect to finish, closes said liquid side stop valve and gas side stop valve carries out refrigerant recovering with predetermined sequencing.
With little chamber volume external heat exchanger is example, set forth respectively off-premises station heat with the refrigerating operaton pattern under refrigerant recovering.
When carrying out off-premises station refrigeration trial run detection, refrigerant flows to shown in arrow among Fig. 2.Refrigerant process cross valve inlet chamber external heat exchanger condensation from the compressor discharge; The liquid refrigerants that comes out from outdoor heat exchanger passes through the throttle part throttling; Survey stop valve, connect short tube, gas side stop valve, cross valve, gas-liquid separator and in these parts tube connectors and gas-liquid separator, evaporate the gas entering compressor after the evaporation through liquid again.Can realize the normal refrigerating operaton of off-premises station under the situation that does not connect indoor set with cocycle, realize that thus the trial run of air-conditioner outdoor unit refrigeration detects.
After accomplishing air-conditioner outdoor unit refrigeration trial run detection, off-premises station is carried out the refrigerant recovering operation, in outdoor heat exchanger, at first close the refrigerant recovering in the system liquid and survey stop valve, close the side stop valve of holding one's breath then at once and can accomplish the refrigerant recovering process.More than operation can be shortened the refrigerant recovering time greatly, improves Production Line efficient.
Heat trial run when detecting carrying out off-premises station, refrigerant flows to shown in arrow among Fig. 3.Survey stop valve and get into the throttle part throttling through cross valve, gas side stop valve, connection short tube, liquid from the refrigerant that compressor is discharged, inlet chamber external heat exchanger heat exchange evaporation then, the gas after the evaporation is through cross valve and gas-liquid separator entering compressor.Can realize off-premises station normal heating operation under the situation that does not connect indoor set with cocycle.
After accomplishing the trial run of air-conditioner outdoor unit refrigeration and detecting, off-premises station is carried out the refrigerant recovering operation, the refrigerant recovering in the system in outdoor heat exchanger.At first close the survey stop valve of holding one's breath, close liquid side stop valve then and can accomplish the refrigerant recovering process at once.
Further; In the practical implementation process, can also control the open and close of said liquid side stop valve and gas side stop valve through the controller in the off-premises station automatically, particularly; When refrigeration mode recover refrigerant, successively close said liquid side stop valve and gas side stop valve through controller; When heating mode recover refrigerant, successively close said gas side stop valve and liquid side stop valve through controller.Realize the refrigerant recovering of off-premises station under two kinds of running statuses thus.
Compare prior art, the protection of too high protection of pressure at expulsion or excessive discharge temperature appears in the outdoor heat exchanger easily less to volume in reclaiming the refrigerant process; Cause refrigerant recovering not thorough, and can influence the reliability of off-premises station, present embodiment is connected the liquid side stop valve in the air-conditioner outdoor unit through connecting short tube with gas side stop valve; Need not connect indoor set; Not only can guarantee off-premises station in the refrigeration of production line, heat trial run and detect, can guarantee the effect that the off-premises station refrigerant reclaims simultaneously again, and then improve the reliability of off-premises station; Solved the problem that existing scheme can't all be recovered to refrigerant the less outdoor heat exchanger of volume; And, can also shorten the refrigerant recovering time greatly for the big off-premises station of groundwater increment, enhance productivity.
The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure or flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical field, all in like manner be included in the scope of patent protection of the present invention.
Claims (7)
1. air-conditioning heat pump refrigerant recovering device; Comprise compressor, multiple-way valve, outdoor heat exchanger, gas-liquid separator, throttle part, liquid side stop valve and gas side stop valve, the output of said compressor is through the gentle side stop valve of said multiple-way valve difference junction chamber external heat exchanger; The input of compressor connects gas-liquid separator, and gas-liquid separator connects gas side stop valve through said multiple-way valve; Outdoor heat exchanger connects liquid side stop valve through said throttle part, it is characterized in that, between said liquid side stop valve and the gas side stop valve through being connected the short tube connection.
2. air-conditioning heat pump refrigerant recovering device according to claim 1; It is characterized in that; Also comprise the controller that is used to control said liquid side stop valve and the open and close of gas side stop valve; When refrigeration mode recover refrigerant, said controller is used for successively cutting out said liquid side stop valve and gas side stop valve; When heating mode recover refrigerant, said controller is used for successively cutting out said gas side stop valve and liquid side stop valve.
3. air-conditioning heat pump refrigerant recovering device according to claim 1 and 2 is characterized in that said multiple-way valve is a cross valve.
4. air-conditioner outdoor unit; Comprise: compressor, multiple-way valve, outdoor heat exchanger, gas-liquid separator, throttle part, liquid side stop valve and gas side stop valve, the output of said compressor is through the gentle side stop valve of said multiple-way valve difference junction chamber external heat exchanger; The input of compressor connects gas-liquid separator, and gas-liquid separator connects gas side stop valve through said multiple-way valve; Outdoor heat exchanger connects liquid side stop valve through said throttle part, it is characterized in that, said air-conditioner outdoor unit is being heated/freeze test running when detecting, between said liquid side stop valve and the gas side stop valve through being connected the short tube connection.
5. air-conditioner outdoor unit according to claim 4 is characterized in that, said multiple-way valve is a cross valve.
6. an air-conditioning heat pump refrigerant recovering method is characterized in that, may further comprise the steps:
Be connected with gas side stop valve through the liquid side stop valve of connection short tube air-conditioner outdoor unit;
After off-premises station heats/freeze test running detection end, close the gentle side stop valve of said liquid side stop valve with predetermined sequencing and carry out refrigerant recovering.
7. air-conditioning heat pump refrigerant recovering method according to claim 6 is characterized in that, saidly closes the step that the gentle side stop valve of said liquid side stop valve carries out refrigerant recovering with predetermined sequencing and comprises:
When refrigeration mode recover refrigerant, successively close said liquid side stop valve and gas side stop valve;
When heating mode recover refrigerant, successively close said gas side stop valve and liquid side stop valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210299456.3A CN102818406B (en) | 2012-08-21 | 2012-08-21 | Refrigerant recovery device and method of heat pump of air-conditioner and outdoor unit of air-conditioner |
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| CN201210299456.3A CN102818406B (en) | 2012-08-21 | 2012-08-21 | Refrigerant recovery device and method of heat pump of air-conditioner and outdoor unit of air-conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104236937A (en) * | 2013-06-08 | 2014-12-24 | 广东美的暖通设备有限公司 | Air-conditioner indoor-unit-free detection device and method |
| CN104329839A (en) * | 2013-07-22 | 2015-02-04 | 广东美的暖通设备有限公司 | Air-conditioning system and low-temperature starting control method thereof |
| CN105674651A (en) * | 2016-02-17 | 2016-06-15 | 广东美芝制冷设备有限公司 | Air conditioner and method for regulating content of refrigerant of air conditioner |
| CN105865031A (en) * | 2016-04-27 | 2016-08-17 | 广东高而美制冷设备有限公司 | Air energy water heater with separable water tank liner |
| CN105987535A (en) * | 2015-02-03 | 2016-10-05 | 宁波奈兰环境系统有限公司 | High-capacity multi-split air-condition heat pump unit for ultra-long-distance conveying of refrigerant |
| CN106369717A (en) * | 2016-10-08 | 2017-02-01 | 芜湖美智空调设备有限公司 | Air-conditioner and control method thereof |
| CN106949569A (en) * | 2017-05-05 | 2017-07-14 | 珠海格力电器股份有限公司 | Outdoor unit and air-conditioner and refrigeration plant |
| CN109654773A (en) * | 2019-02-13 | 2019-04-19 | 格力电器（合肥）有限公司 | Prevent the air-conditioner outdoor unit recovery system and its method of secondary refrigerant leakage |
| CN111121156A (en) * | 2020-01-20 | 2020-05-08 | 青岛海信日立空调系统有限公司 | Multi-connected air conditioner |
| CN114279729A (en) * | 2021-12-09 | 2022-04-05 | 格力电器（合肥）有限公司 | Air conditioner butt joint device and system |
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| CN104236937A (en) * | 2013-06-08 | 2014-12-24 | 广东美的暖通设备有限公司 | Air-conditioner indoor-unit-free detection device and method |
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| CN106949569A (en) * | 2017-05-05 | 2017-07-14 | 珠海格力电器股份有限公司 | Outdoor unit and air-conditioner and refrigeration plant |
| CN106949569B (en) * | 2017-05-05 | 2023-12-22 | 珠海格力电器股份有限公司 | Outdoor unit, air conditioner and refrigeration equipment |
| CN109654773A (en) * | 2019-02-13 | 2019-04-19 | 格力电器（合肥）有限公司 | Prevent the air-conditioner outdoor unit recovery system and its method of secondary refrigerant leakage |
| CN111121156A (en) * | 2020-01-20 | 2020-05-08 | 青岛海信日立空调系统有限公司 | Multi-connected air conditioner |
| CN114279729A (en) * | 2021-12-09 | 2022-04-05 | 格力电器（合肥）有限公司 | Air conditioner butt joint device and system |
Also Published As
| Publication number | Publication date |
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| CN102818406B (en) | 2015-04-22 |
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