CN206771795U - Air-conditioning system - Google Patents
Air-conditioning system Download PDFInfo
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- CN206771795U CN206771795U CN201720460224.XU CN201720460224U CN206771795U CN 206771795 U CN206771795 U CN 206771795U CN 201720460224 U CN201720460224 U CN 201720460224U CN 206771795 U CN206771795 U CN 206771795U
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- conditioning system
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Abstract
The utility model discloses a kind of air-conditioning system, and the air-conditioning system includes：Compressor, the first four-way valve, indoor heat exchanger, first throttle element and the first outdoor heat exchanger are connected the heating branch road to be formed, and the compressor, the second outdoor heat exchanger, magnetic valve and the second restricting element are connected the defrosting branch road to be formed, between the air inlet of the compressor and gas outlet, first outdoor heat exchanger and second outdoor heat exchanger are disposed adjacent for the defrosting branch road and the heating branch circuit parallel connection.Technical solutions of the utility model can shorten defrosting time in the case where not reducing indoor temperature.
Description
Technical field
Conditioner technical field is the utility model is related to, more particularly to a kind of air-conditioning system.
Background technology
As the improvement of people's living standards, requirement more and more higher of the people to air conditioner.When air conditioner is in heating mould
During formula, cold air inside is converted to hot blast to indoor blowout from the heat exchange of indoor heat exchanger surface, and air conditioner is in heating operation one
After the section time, because outdoor temperature is relatively low, frost occurs in outdoor heat exchanger, need to be defrosted not influence heating effect
Processing.The inverse circulation of use that existing heat pump type air conditioner has is defrosted, and its operation mechanism can be reduced to：Into defrosting mould
Formula-compressor stopping-four-way reversing valve commutation-compressor start-defrosting-compressor stopping-four-way reversing valve commutation-compressor
Startup-defrosting terminates.What is blown out when the greatest drawback of this method is defrosting in room is cold wind, and room temperature is reduced, had a strong impact on
Indoor comfort degree.Another conventional Defrost method is hot gas bypass defrosting, i.e., is improved using the exhaust heat of compressor
Outdoor heat exchanger inlet temperature during heating, but this method defrost is slow, time length.
Utility model content
Main purpose of the present utility model is to provide a kind of air-conditioning system, it is intended to does not cause room while can effectively defrosting
Interior temperature reduces, and can shorten defrosting time again.
To achieve the above object, the utility model proposes air-conditioning system, including compressor, the first four-way valve, interior change
Hot device, first throttle element and the first outdoor heat exchanger are connected the heating branch road to be formed, and outside the compressor, second Room
Heat exchanger, magnetic valve and the second restricting element are connected the defrosting branch road to be formed, the defrosting branch road with the heating branch road simultaneously
It is coupled between air inlet and the gas outlet of the compressor, first outdoor heat exchanger and second outdoor heat exchanger
It is disposed adjacent.
Preferably, the air-conditioning system also includes the second four-way valve, and the magnetic valve is triple valve, the indoor heat exchanger
Including the first indoor heat exchanger and the second indoor heat exchanger；Wherein：
The first port of second four-way valve is connected to the gas outlet of the compressor, and the second of second four-way valve
Port, the 3rd port and the 4th port are connected to the air inlet of the second indoor heat exchanger, the second outdoor heat exchanger and compressor
Mouthful, the first end of the triple valve and the second end be communicated in second restricting element and second indoor heat exchanger it
Between, the first end of the triple valve and the 3rd end are communicated between second restricting element and second four-way valve, described
First indoor heat exchanger is connected between first four-way valve and first throttle element.
Preferably, the air-conditioning system also includes check valve, the check valve be connected to the 3rd end of the triple valve with
Between the second port of second four-way valve.
Preferably, first indoor heat exchanger is arranged side by side with the second indoor heat exchanger.
Preferably, second outdoor heat exchanger is arranged at the side outside the first outdoor heat exchanger faced chamber.
Preferably, in addition to temperature sensor and controller, the temperature sensor are located at second outdoor heat exchanger
Middle part pipeline, the controller electrically connects with temperature sensor, magnetic valve, the first four-way valve and the second four-way valve respectively, described
Controller receives the detection information of temperature sensor feedback, controls the conducting and cut-off of the magnetic valve, the second four-way valve.
Preferably, the first throttle element and the second restricting element are electric expansion valve.
In technical solutions of the utility model, air-conditioning system is provided with the heating branch road and defrosting branch road of parallel connection, when being removed
When white, defrosting branch road do not influence heat branch road heated, can make the air-conditioning system defrosting while, can also continue into
Row heating, so as to persistently blow out hot blast to interior, improves the comfortableness of the device.Meanwhile the branch road that defrosts is mainly used in defrosting, by
The high pressure gaseous refrigerant of output directly inputs the second outdoor heat exchanger in compressor, and heat is more during being somebody's turn to do and concentrates, can
To carry out quickly defrosting to the second outdoor heat exchanger, defrosting time is greatly shortened, and do not increase other heating in air-conditioning system
Equipment and thermal storage equipment, it is simple in construction, reduce operating cost.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to the structure shown in these accompanying drawings.
Fig. 1 is the flow chart of the embodiment of the utility model air-conditioning system defrosting mode one；
Fig. 2 is the flow chart of the embodiment of the utility model air-conditioning system heating mode one.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 10 | Compressor | 60 | Check valve |
| 20 | First four-way valve | 70 | Indoor heat exchanger |
| 30 | Outdoor heat exchanger | 71 | First indoor heat exchanger |
| 31 | First outdoor heat exchanger | 73 | Second indoor heat exchanger |
| 33 | Second outdoor heat exchanger | 80 | Second four-way valve |
| 40 | First throttle element | 90 | Second restricting element |
| 50 | Triple valve |
Realization, functional characteristics and the advantage of the utility model purpose will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only part of the embodiment of the present utility model, rather than all
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belong to the scope of the utility model protection.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute in the utility model embodiment
It is only used for explaining relative position relation under a certain particular pose (as shown in drawings) between each part, motion conditions etc., such as
When the fruit particular pose changes, then directionality instruction also correspondingly changes therewith.
In addition, the description for being related to " first ", " second " etc. in the utility model is only used for describing purpose, without being understood that
To indicate or implying its relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ",
At least one this feature can be expressed or be implicitly included to the feature of " second ".In addition, the technical side between each embodiment
Case can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, when the combination of technical scheme
Occur conflicting or will be understood that the combination of this technical scheme is not present when can not realize, also not in the requires of the utility model
Protection domain within.
Referring to Figures 1 and 2, the utility model proposes air-conditioning system, including：
Compressor 10, the first four-way valve 20, indoor heat exchanger 70, first throttle element 40, the first outdoor heat exchanger 31 are gone here and there
Join the heating branch road formed, and the compressor 10, the second outdoor heat exchanger 33, magnetic valve and the second restricting element 90 are connected
The defrosting branch road of formation, the defrosting branch road and air inlet and gas outlet of the heating branch circuit parallel connection in the compressor 10
Between, first outdoor heat exchanger 31 and second outdoor heat exchanger 33 are disposed adjacent.
Air-conditioning system generally comprise series connection formed the compressor of coolant loop, four-way valve, indoor heat exchanger, restricting element,
And outdoor heat exchanger, when source pump or air-conditioning system are freezed, four-way valve is closed, the gaseous state discharged through compressor
Refrigerant via four-way valve flow into outdoor heat exchanger, then through restricting element, indoor heat exchanger return to compressor complete once refrigeration follow
Ring；When source pump or air-conditioning system heat, four-way valve is in unimpeded state, and the gaseous coolant through compressor discharge is via four
Port valve flows into indoor heat exchanger, then returns to compressor through restricting element, outdoor heat exchanger and complete once heating circulation.The present embodiment
In the restricting element 90 of first throttle element 40 and second can be capillary or electric expansion valve, preferably electronic expansion
Valve, outdoor heat exchanger 30 is divided into adjacent the first outdoor heat exchanger 31 and the second outdoor heat exchanger 33, there are two refrigerants
Import and two refrigerant exits, the convenient circulation for carrying out two branch roads, and the inlet and outlet for carrying out heat exchanger during patten transformation need not
Reconnect, while structure is more compact.
In technical solutions of the utility model, air-conditioning system is provided with the heating branch road and defrosting branch road of parallel connection, when not defrosting
When, when being defrosted, defrosting branch road does not influence heating branch road and heated, and can make the air-conditioning system while defrosting,
It can also continue to be heated, and without indoor heat exchanger 70 in the branch road that defrosts, not heat in absorption chamber, so as to hold interior
Continuous blowout hot blast, improve the comfortableness of the device.Meanwhile the defrosting branch road is to be substantially carried out defrosting, by being exported in compressor 10
High pressure gaseous refrigerant directly input the second outdoor heat exchanger 33, should during heat it is more and concentrate, can be to second Room
External heat exchanger 33 carries out quickly defrosting, greatly shortens defrosting time, and does not increase other firing equipments in air-conditioning system with storing
Hot equipment, it is simple in construction, reduce operating cost.
Continue referring to Fig. 1, the air-conditioning system also includes the second four-way valve 80, and the magnetic valve is triple valve 50, institute
Stating indoor heat exchanger 70 includes the first indoor heat exchanger 71 and the second indoor heat exchanger 73；Wherein：
The first port D of second four-way valve 80 is connected to the gas outlet of the compressor 10, second four-way valve
80 second port E, the 3rd port C and the 4th port S is connected to the second indoor heat exchanger 73, the second outdoor heat exchanger
33 and the air inlet of compressor 10, the end 2 of first end 1 and second of the triple valve 50 be communicated in second restricting element 90
Between second indoor heat exchanger 73, the end 3 of first end 1 and the 3rd of the triple valve 50 is communicated in second throttling
Between element 90 and second four-way valve 80, first indoor heat exchanger 71 is connected to first four-way valve 20 and first
Between restricting element 40.
In the present embodiment, by the setting of the second four-way valve 80 and triple valve 50, defrosting branch road can be subjected to commutation and turned
It is changed into another heating branch road, meanwhile, in heating mode, two heating branch roads are each carried out for convenience, are independent of each other, will
Indoor heat exchanger 70 is arranged to the first indoor heat exchanger 71 and the second indoor heat exchanger 73.
Fig. 1 is continued referring to, also includes check valve 60 in the branch road that defrosts, check valve 60 is connected to the 3rd of triple valve 50
Between the second port E of the four-way valve 80 of end 3 and second.
In the present embodiment, check valve 60 is used for the flow direction for controlling refrigerant, located at the 3rd end 3 and second of triple valve 50
It is in order in defrosting mode between the second port E of four-way valve 80, it is ensured that refrigerant flows to the two or four by triple valve 50
Port valve 80, and when being not at defrosting mode so that refrigerant will not flow to triple valve 50 by the second four-way valve 80, cold so as to avoid
Matchmaker's unnecessarily wastes, and can make it that heating effect is more preferable.
Specifically, when air-conditioning system is in defrosting mode, the gas outlet of defrosting branch compressors 10 is drawn, now, the
The DC ports of one four-way valve 20 are unimpeded, and the high temperature and high pressure gas of gas outlet outflow of a part of refrigerant through compressor 10 are through DC pipelines
Flow to outdoor heat exchanger 30 to be defrosted, specially the second outdoor heat exchanger 33, after defrosting, flowed from the second outdoor heat exchanger 33
The cryogenic high pressure liquid refrigerants gone out flows to the second restricting element 90, and low-temp low-pressure liquid is converted to after the throttling of the second restricting element 90
Body, now, triple valve 50 and check valve 60 are also at conducting state, i.e. the second end 2 of triple valve 50 blocks, first end 1 and the
Three ends 3 are unimpeded, flow to the second four-way valve 80 finally by triple valve 50 and check valve 60, the ES pipelines of the second four-way valve 80 are smooth
Logical, low-temp low-pressure refrigerant is returned in compressor 10, completes defrosting loop.It is simple in construction during the defrosting, it is extra without increasing
Firing equipment etc., cost is low, and the heat of the defrosting branch road is provided by the refrigerant in compressor 10, substantially increases defrosting effect
Rate.
When air-conditioning system is in defrosting mode, the heating branch road of the air-conditioning system is also unimpeded, for indoor lasting system
Heat, the heating branch route the first four-way valve 20, indoor heat exchanger 70, first throttle element 40 and the series connection shape of outdoor heat exchanger 30
Into indoor heat exchanger 70 is specially the first indoor heat exchanger 71, and outdoor heat exchanger 30 is specially the first indoor heat exchanger 31, is heated
The gas outlet of branch compressors 10 is drawn, and now, the DE pipelines and CS pipelines of the first four-way valve 20 are unimpeded, by compressor 10
High pressure gaseous refrigerant is formed after compression, a part flows to the second four-way valve 80 and defrosted, and another part passes through the one or four
The first indoor heat exchanger of DE pipeline flow-directions 71 of port valve 20, is converted to HTHP liquid refrigerant, to indoor carry out heat release, then passes through
Cross first throttle element 40 and be converted to low temperature and low pressure liquid, flow to the first outdoor heat exchanger 31, absorb external heat, be converted to low
Warm low-pressure steam, then returned to by the CS pipelines of the first four-way valve 20 in compressor 10.In the first four-way valve 20 and compressor 10
Between can also be separated by a gas-liquid separator.Two four-way valves are set, can to heat branch road and the branch road that defrosts
It is independent of each other, it is possible to increase defrosting efficiency and do not influence heating efficiency.Meanwhile the defrosting branch road can be in situation about not defrosting
Under, another heating branch road is converted to, and then increase the multi-mode of the air-conditioning system.
Fig. 2 is refer to, the air-conditioning system is in heating mode when without defrosting, by heating branch road and the defrosting of commutation
Branch road is heated jointly.Now, the DE pipelines of the second four-way valve 80 and CS pipelines are unimpeded, and check valve 60 is closed, triple valve 50
The end 2 of first end 1 and second open, the 3rd end 3 is closed.A part in the high pressure gaseous refrigerant flowed out by compressor 10
The first indoor heat exchanger of DE pipeline flow-directions 71 of the first four-way valve 20 is continued through, HTHP liquid refrigerant is converted to, to room
Interior carry out heat release, then low temperature and low pressure liquid is converted to by first throttle element 40, the first outdoor heat exchanger 31 is flowed to, is absorbed outer
Boundary's heat, low-temp low-pressure steam is converted to, then is returned to by the CS pipelines of the first four-way valve 20 in compressor 10, complete heating branch
Road loop.Another part of the high pressure gaseous refrigerant flowed out by compressor 10 enters by the DE pipelines of the second four-way valve 80
Second indoor heat exchanger 73, HTHP liquid refrigerant is converted to, to indoor release heat, then the second end by triple valve 50
2 flow to the second restricting element 90 with first end 1, are converted to low-temp low-pressure liquid refrigerants, into the second outdoor heat exchanger 33, conversion
For low-temp low-pressure gaseous coolant, finally returned to by the CS pipelines of the second four-way valve 80 in compressor 10, complete another heating
Loop.
In above two pattern, the first indoor heat exchanger 71 is arranged side by side with the second indoor heat exchanger 73.
In the present embodiment, indoor heat exchanger 70 is divided into two modules, exported respectively with two imports and two, shape
Into the first indoor heat exchanger 71 and the second indoor heat exchanger 73.In heating mode, the setting of the structure can cause two systems
Between hot branch road without any confusion, do not interfere with each other, and defrosting mode unlatching after, without carry out import with outlet replacing, just
It can carry out heating loop and the conversion for the branch road that defrosts, and then defrosting time can be reduced, improve efficiency.
Meanwhile second outdoor heat exchanger 33 be arranged at side outside the faced chamber of the first outdoor heat exchanger 31.In the present embodiment,
Because the frosting of outdoor heat exchanger 30 is gradually carried out from outside, so by defrosting branch road by being changed outside the second Room located at outside
It hot device 33, can just be defrosted when the second outdoor heat exchanger 33 starts frosting, so as to effectively defrost, and be ensured
The frost-free of the first outdoor heat exchanger 31 of inner side, while saving defrosting time, it is possibility to have preferable defrosting effect, further
Improve defrosting efficiency.
The open and close of the defrosting mode of the air-conditioning system can also pass through sensing chamber by setting timing to carry out
Carried out after the temperature of external heat exchanger 30, it is preferable that the air-conditioning system also includes temperature sensor (not shown), the TEMP
Device is located at the middle part pipeline of the second outdoor heat exchanger 33.Certainly, the air-conditioning system also includes controller (not shown), the controller
Electrically connected respectively with temperature sensor, triple valve 50, the first four-way valve 20, the second four-way valve 80, controller receives TEMP
The detection information of device feedback, controls the conducting and cut-off of triple valve 50, the second four-way valve 80.
In the present embodiment, because of the second outdoor heat exchanger 33 more in the outer part, first outdoor heat exchanger 31 of its temperature compared with inner side
It is low, so the temperature on detection the second outdoor heat exchanger 33 surface, determines whether to open defrosting mode.Specifically, temperature passes
Sensor in real time monitoring the second outdoor heat exchanger 33 middle part pipeline surface temperature, controller set it is in need defrosted it is minimum
Temperature, when the temperature that temperature sensor passes to controller is less than the minimum temperature, controller is issued by control signal, opens single
To valve 60, the opening of triple valve 50 is controlled, and controls the pipeline flow of the second four-way valve 80, starts defrosting mode.The structure
Setting can cause air-conditioning system to be defrosted when necessary, it is not necessary to when all heated, the effectively save energy, and can
Defrosting in time, improve defrosting efficiency.
The utility model also includes the defrosting control method of above-mentioned air-conditioning system, and the defrosting control method includes：
When air-conditioning system is in heating mode, the second outdoor heat exchanger 33 that timing acquisition temperature sensor detects
Temperature；
When the temperature of second outdoor heat exchanger 33 is less than default defrosting temperature, second four-way valve 80 is controlled to change
To the connection outdoor heat exchanger 33 of compressor 10 and second, and control the commutation of triple valve 50 connection second throttling
The four-way valve 80 of element 90 and second, carry out defrosting mode.
In defrost mode, the temperature of the second outdoor heat exchanger 33 that timing acquisition temperature sensor detects；
When the temperature of the second outdoor heat exchanger 33 is higher than default defrosting temperature, control the second four-way valve 80 commutation connection
The indoor heat exchanger 33 of compressor 10 and second, and control the commutation of triple valve 50 connection the second indoor heat exchanger 33 and the second section
Fluid element 90, carry out heating mode.
In the present embodiment, temperature in use sensor is detected, the middle part pipeline table of specially the second outdoor heat exchanger 33
The temperature in face, and testing result is sent to controller, the conversion of defrosting mode is carried out in time.Removing in the defrosting control method
Change between white pattern and heating mode, shut down without compressor 10, it is not required that enter the replacing connection of line interface, only need simple
The open and close of control valve, it is simple to operation.
Either whether defrosted, heating branch road is all heated always so that the air-conditioning system ensures not reduce room
Defrosted in the case of interior temperature, improve comfortableness.
When air-conditioning system in defrost mode, defrosting mode can also be carried out by another method and exited, that is, obtained
Operation duration under defrosting mode；
When defrosting mode operation duration is more than preset duration, control the second four-way valve 80 commutation connection compressor 10 and the
Two indoor heat exchangers 33, and the commutation of triple valve 50 second indoor heat exchanger 33 of connection and the second restricting element 90 are controlled, enter
Row heating mode.
Preferred embodiment of the present utility model is the foregoing is only, not thereby limits the scope of the claims of the present utility model,
Every equivalent structure change under inventive concept of the present utility model, made using the utility model specification and accompanying drawing content
Change, or directly/be used in other related technical areas indirectly and be included in scope of patent protection of the present utility model.
Claims (7)
- A kind of 1. air-conditioning system, it is characterised in that including compressor, the first four-way valve, indoor heat exchanger, first throttle element, And first outdoor heat exchanger connect the heating branch road to be formed, and the compressor, the second outdoor heat exchanger, magnetic valve and Two restricting elements are connected the defrosting branch road to be formed, and the defrosting branch road is with the heating branch circuit parallel connection in the air inlet of the compressor Between mouth and gas outlet, first outdoor heat exchanger and second outdoor heat exchanger are disposed adjacent.
- 2. air-conditioning system as claimed in claim 1, it is characterised in that the air-conditioning system also includes the second four-way valve, described Magnetic valve is triple valve, and the indoor heat exchanger includes the first indoor heat exchanger and the second indoor heat exchanger；Wherein：The first port of second four-way valve is connected to the gas outlet of the compressor, the second end of second four-way valve Mouth, the 3rd port and the 4th port are connected to the air inlet of the second indoor heat exchanger, the second outdoor heat exchanger and compressor, The first end of the triple valve and the second end are communicated between second restricting element and second indoor heat exchanger, institute The first end and the 3rd end for stating triple valve are communicated between second restricting element and second four-way valve, first Room Interior heat exchanger is connected between first four-way valve and first throttle element.
- 3. air-conditioning system as claimed in claim 2, it is characterised in that the air-conditioning system also includes check valve, described unidirectional Valve is connected between the 3rd end of the triple valve and the second port of second four-way valve.
- 4. air-conditioning system as claimed in claim 2, it is characterised in that first indoor heat exchanger and the second indoor heat exchanger It is arranged side by side.
- 5. the air-conditioning system as described in Claims 1-4 is any, it is characterised in that second outdoor heat exchanger is arranged at institute State the side outside the first outdoor heat exchanger faced chamber.
- 6. air-conditioning system as claimed in claim 2, it is characterised in that also including temperature sensor and controller, the temperature Sensor is located at the second outdoor heat exchanger central tube road, the controller respectively with temperature sensor, magnetic valve, the one or four Port valve and the electrical connection of the second four-way valve, the controller receive the detection information of temperature sensor feedback, control the magnetic valve, The conducting and cut-off of second four-way valve.
- 7. air-conditioning system as claimed in claim 1, it is characterised in that the first throttle element is with the second restricting element Electric expansion valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720460224.XU CN206771795U (en) | 2017-04-27 | 2017-04-27 | Air-conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720460224.XU CN206771795U (en) | 2017-04-27 | 2017-04-27 | Air-conditioning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206771795U true CN206771795U (en) | 2017-12-19 |
Family
ID=60635638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720460224.XU Active CN206771795U (en) | 2017-04-27 | 2017-04-27 | Air-conditioning system |
Country Status (1)
| Country | Link |
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| CN (1) | CN206771795U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106931676A (en) * | 2017-04-27 | 2017-07-07 | 广东美的制冷设备有限公司 | Air-conditioning system and its defrosting control method |
| CN109059332A (en) * | 2018-06-05 | 2018-12-21 | 青岛海尔空调器有限总公司 | A kind of while heating and refrigeration one drag more air-conditionings and its control method, device |
| CN109579194A (en) * | 2018-12-29 | 2019-04-05 | 广东志高暖通设备股份有限公司 | A kind of air-conditioning system and its working method with outdoor unit defrosting function |
-
2017
- 2017-04-27 CN CN201720460224.XU patent/CN206771795U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106931676A (en) * | 2017-04-27 | 2017-07-07 | 广东美的制冷设备有限公司 | Air-conditioning system and its defrosting control method |
| CN106931676B (en) * | 2017-04-27 | 2024-06-25 | 广东美的制冷设备有限公司 | Air conditioning system and defrosting control method thereof |
| CN109059332A (en) * | 2018-06-05 | 2018-12-21 | 青岛海尔空调器有限总公司 | A kind of while heating and refrigeration one drag more air-conditionings and its control method, device |
| CN109579194A (en) * | 2018-12-29 | 2019-04-05 | 广东志高暖通设备股份有限公司 | A kind of air-conditioning system and its working method with outdoor unit defrosting function |
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