CN104154672B - Multiple on-line system in parallel and defrosting control method - Google Patents
Multiple on-line system in parallel and defrosting control method Download PDFInfo
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- CN104154672B CN104154672B CN201410384064.6A CN201410384064A CN104154672B CN 104154672 B CN104154672 B CN 104154672B CN 201410384064 A CN201410384064 A CN 201410384064A CN 104154672 B CN104154672 B CN 104154672B
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Abstract
The open a kind of multiple on-line system in parallel of the present invention and defrosting control method, this system includes at least two off-premises stations of parallel connection, off-premises station includes compressor, cross valve, outdoor heat exchanger and throttling arrangement, throttling arrangement connects indoor set by liquid side stop valve, the condensation end of cross valve connects indoor set by gas side stop valve, off-premises station also includes the first pipeline and the second pipeline, it is also associated with the first electromagnetic valve between throttling arrangement and liquid side stop valve, between condensation end and the gas side stop valve of cross valve, is also associated with the second electromagnetic valve；Wherein during an off-premises station defrost, the off-premises station of this defrost switches to refrigeration mode, and the off-premises station of this defrost and the first and second pipeline conducting of other at least one off-premises station that coordinates with it, first and second closed electromagnetic valve.When the present invention makes defrost there is not evaporation process in indoor, and washes away sound without coolant during commutation, improves comfort level and the defrost speed of air-conditioner.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly relate to a kind of multiple on-line system in parallel and defrosting control side
Method.
Background technology
At present, within air-conditioning systems, multi-connected machine defrost technology and one-to-one type defrost mode there is no at all
Difference, is still employing cross valve commutation, from heating after cyclic switching is kind of refrigeration cycle, utilizes condensation transconversion into heat
Fall frost layer.Owing to the heat transfer process of indoor heat exchanger need to be switched to evaporation process, after switching by this kind of scheme
The hot comfort of indoor can be affected, and have coolant and wash away sound during switching, thus reduce changing of air-conditioner
Thermal effect so that Consumer's Experience is poor；Additionally, during defrost, the blower fan of indoor set generally will not rotate,
Make indoor heat exchanger evaporation effect the best, thus extend the defrost time.
Summary of the invention
Present invention is primarily targeted at a kind of multiple on-line system in parallel of offer and defrosting method, to improve sky
Adjust comfort level and the defrost effect of off-premises station of device.
In order to achieve the above object, the present invention proposes a kind of multiple on-line system in parallel, including parallel connection at least
Two off-premises stations, described off-premises station includes compressor, cross valve, outdoor heat exchanger and throttling arrangement, institute
Stating throttling arrangement and connect indoor set by liquid side stop valve, the condensation end of described cross valve is ended by gas side
Valve connects indoor set, and described off-premises station also includes the first pipeline and the second pipeline, wherein:
One end of described first pipeline is connected between described throttling arrangement and liquid side stop valve；
One end of described second pipeline be connected to the gas returning port of described compressor and cross valve exhaust end it
Between；
The other end of the first pipeline of each off-premises station is connected with each other；The other end of the second pipeline of each off-premises station
It is connected with each other；
The first electromagnetic valve and described first pipeline it is also associated with between described throttling arrangement and liquid side stop valve
One end is connected between described throttling arrangement and described first electromagnetic valve, the condensation end of described cross valve and gas
The second electromagnetic valve it is also associated with between the stop valve of side.
Preferably, the other end of the first pipeline of each off-premises station is connected with each other by connecting tube；Each off-premises station
The other end of the second pipeline be connected with each other by connecting tube.
Preferably, described first pipeline includes the 3rd electromagnetic valve；Described second pipeline includes the 4th electromagnetic valve.
Preferably, a three-way valve merged into by described 3rd electromagnetic valve and described first electromagnetic valve.
Preferably, the end of the other end of the first pipeline of described off-premises station and the other end of the second pipeline
End be connected to a stop valve, access after multiple on-line system at described off-premises station, described stop valve
Keep opening state.
Preferably, described off-premises station be three or more than.
Preferably, described throttling arrangement is electric expansion valve.
The embodiment of the present invention also proposes a kind of multiple on-line system defrosting control method in parallel, including:
When a wherein off-premises station defrost in described system, the off-premises station of this defrost is switched to refrigeration mode；
By first and second pipeline conducting of the off-premises station of this defrost, first and second closed electromagnetic valve；Will with institute
State first and second pipeline conducting of other at least one off-premises station of the off-premises station cooperation of defrost, first and second electricity
Magnet valve is closed；The evaporation ends of the cross valve of the off-premises station of defrost and inlet end conducting, outlet side and condensation end
Conducting；The evaporation ends of the cross valve of the off-premises station coordinated with the off-premises station of described defrost and outlet side conducting,
Inlet end and condensation end conducting.
The multiple on-line system a kind of in parallel of present invention proposition and defrosting method, in the outer machine system of parallel connection
During frost, disconnect towards the electromagnetic valve on indoor heat exchanger pipeline, can by the first pipeline and the second pipeline
Making condensed coolant be evaporated process in the condenser of another off-premises station, when making defrost, indoor is not
There is evaporation process, and wash away sound, so that indoor heat exchanger duty is not subject to without coolant during commutation
Defrost process influence；And the condenser owing to being evaporated can run blower fan, greatly improve defrost speed
Degree.Additionally, three and during above off-premises station parallel connection, rotation can carry out defrost process, remaining off-premises station is still
Keeping heating state, heating operations does not stops, and the comfort level of air-conditioner is greatly improved.
Accompanying drawing explanation
Fig. 1 is the structural representation of single off-premises station in parallel connection multiple on-line system embodiment of the present invention；
Fig. 2 is the structural representation of parallel connection multiple on-line system preferred embodiment of the present invention；
Fig. 3 is that coolant during embodiment of the present invention parallel connection multiple on-line system defrost flows to schematic diagram；
Fig. 4 is that the flow process of embodiment of the present invention parallel connection multiple on-line system defrosting control method preferred embodiment is shown
It is intended to.
In order to make technical scheme clearer, clear, make the most in detail below in conjunction with accompanying drawing
State.
Detailed description of the invention
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not used to limit
Determine the present invention.
As shown in Figures 1 and 2, present pre-ferred embodiments proposes a kind of multiple on-line system in parallel, can make
During air conditioning system defrost there is not evaporation process in indoor, and washes away sound without coolant during commutation, improves sky
The comfort of adjusting system.
This parallel connection multiple on-line system includes at least two off-premises stations of parallel connection, and each off-premises station parallel with one another passes through
Connecting tube connects；Each described off-premises station includes compressor 2, cross valve 3, outdoor heat exchanger 4, throttling
Device 9 and gas side stop valve 72 and liquid side stop valve 71, compressor 2 has air vent and gas returning port；
Cross valve 3 has evaporation ends 31, condensation end 34, outlet side 33 and inlet end 32, and heat exchanger 4 connects
Evaporation ends 31 (situation being under heating mode relative to off-premises station) at throttling arrangement 9 with cross valve 3
Between, the air vent of compressor 2 connects the inlet end 32 of cross valve 3, and the gas returning port of compressor 2 connects
The outlet side 33 of cross valve 3.
Described throttling arrangement 9 is specifically as follows electric expansion valve.
Described throttling arrangement 9 connects indoor set, the condensation end of described cross valve 3 by liquid side stop valve 71
34 connect indoor set by gas side stop valve 72.
The present embodiment off-premises station also includes first electromagnetic valve the 61, second electromagnetic valve 62, and band the 3rd electromagnetism
First pipeline 51 of valve 63 and the second pipeline 52 with the 4th electromagnetic valve 64, wherein:
One end of described first pipeline 51 is connected between described throttling arrangement 9 and liquid side stop valve 71；
One end of described second pipeline 52 be connected to the gas returning port of described compressor 2 and cross valve 3 exhaust end it
Between；
The other end of the first pipeline 51 of each off-premises station is connected with each other；Second pipeline 52 of each off-premises station
The other end is connected with each other.
Further, before preventing off-premises station from accessing multiple on-line system, secondary refrigerant leakage therein, this reality
Also in the end of the other end of the first pipeline 51 of off-premises station, connection has a stop valve 81, at off-premises station to execute example
The second pipeline 52 the other end end connect have a stop valve 82.Multiple on-line system is accessed at off-premises station
After, above-mentioned stop valve 81,82 keeps opening state.
Described first electromagnetic valve 61 is connected between throttling arrangement 9 and liquid side stop valve 71, the second electromagnetism
Valve 62 is connected between the condensation end 34 of described cross valve 3 and gas side stop valve 72.
Wherein during an off-premises station defrost, the off-premises station of this defrost switches to refrigeration mode, and this defrost
Off-premises station and the first pipeline 51 of other at least one off-premises station and the second pipeline 52 that coordinate with it turn on,
First electromagnetic valve 61 and the second electromagnetic valve 62 are closed.
Thus, by such scheme, when the outer machine system of parallel connection carries out defrost, towards indoor heat exchanger
Electromagnetic valve (i.e. first electromagnetic valve 61 and the second electromagnetic valve 62) on pipeline disconnects, by the first pipeline
51 and second pipeline 52 condensed coolant can be made to be evaporated process in the condenser of another off-premises station,
When making defrost there is not evaporation process in indoor, and washes away sound, so that indoor are changed without coolant during commutation
Hot device duty is not by defrost process influence, it is ensured that the comfortableness of air conditioning system；And owing to steaming
The condenser sent out can run blower fan, greatly improves defrost speed.
Include that the present embodiment scheme is described in detail by three off-premises stations with multiple on-line system in parallel below.
As shown in the i.e. Fig. 3 of Fig. 2, multiple on-line system in parallel includes off-premises station 11, off-premises station 12, off-premises station
13, the first pipeline 51 of each off-premises station is connected with each other by connecting tube；Second pipeline 52 of each off-premises station
It is connected with each other by connecting tube.
During original state, off-premises station 11, off-premises station 12, off-premises station 13 all run under heating mode.
When setting off-premises station 11 needs defrost, with off-premises station 12, off-premises station 11 carries out defrost, certainly, also
Multiple off-premises station can be had to coordinate with the off-premises station of defrost, and the present embodiment enters with an off-premises station 12 coordinated
Row citing.Off-premises station 13 keeps normal heating mode to run.
When off-premises station 11 needs to carry out defrost, the off-premises station 11 of this defrost is switched to refrigeration mode；
And the first pipeline 51 and second pipeline 52 of the off-premises station 11 of this defrost are turned on, the first electromagnetic valve 61
Close with the second electromagnetic valve 62.
Additionally, the first pipeline 51 and second of the off-premises station 12 coordinated with the off-premises station 11 of this defrost is managed
Road 52 turns on, and the first electromagnetic valve 61 and the second electromagnetic valve 62 are closed.
As it is shown on figure 3, when off-premises station 11 carries out defrost, coolant during defrost flows to such as arrow in Fig. 3
Shown in.
In off-premises station 11 side, off-premises station 11 is switched to refrigeration mode, the four of off-premises station 11 by heating mode
Evaporation ends 31 and the inlet end 32 of logical valve 3 turn on, and outlet side 33 and condensation end 34 turn on, off-premises station
Compressor 2 air vent of 11 high temperature refrigerant out, through inlet end 32 and the evaporation ends 31 of cross valve 3
Entering heat exchanger 4 to carry out condensing heat release, liberated heat carries out defrost, from heat exchanger 4 to this heat exchanger 4
Low temperature coolant out is entered the first pipeline 51 of off-premises station 12 by the first pipeline 51.
In off-premises station 12 side, evaporation ends 31 and the outlet side 33 of the cross valve 3 of off-premises station 12 turn on,
Inlet end 32 and condensation end 34 turn on, the first pipeline 51 coolant entered is through heat exchanger 4 evaporation and heat-exchange
After, enter the second pipeline 52 of off-premises station 12 through the evaporation ends 31 of cross valve, outlet side 33, by outdoor
Second pipeline 52 of machine 12 returns to the second pipeline 52 of off-premises station 11 and enters the compressor of off-premises station 11,
Circulate with this.
Thus, the room of defrost can be made by corresponding first pipeline 51 and the second pipeline 52 and electromagnetic valve
In outer machine 11, condensed coolant is evaporated process in the condenser of another off-premises station 12, makes defrost
Time indoor there is not evaporation process, and wash away sound without coolant during commutation compared to existing technology so that
Indoor heat exchanger duty is not by defrost process influence.
Further, since the condenser that off-premises station 12 is evaporated can run blower fan, thus greatly improve
Defrost speed.
From said process, as three and above off-premises station parallel connection, rotation can carry out defrost process,
Remaining off-premises station still keeps heating state, and heating operations does not stops, and air-conditioner comfortable is thus greatly improved
Degree.
Need further exist for explanation, in above-described embodiment, the 3rd electromagnetic valve 63 and the first electromagnetic valve 61
Can merge and be substituted by a three-way valve, i.e. cancel the 3rd electromagnetic valve 63 of the first pipeline 51, and throttling dress
Put the first electromagnetic valve 61 between 9 and liquid side stop valve 71, then realized handoff functionality by three-way solenoid valve.
It addition, the 3rd electromagnetic valve 63 and second in above-described embodiment, on the first pipeline 51 of off-premises station
The 4th electromagnetic valve 64 on pipeline 52, directly correspondence can be arranged on each first pipeline 51 and second of connection
On the connecting line of pipeline 52, i.e. between throttling arrangement 9 and the first electromagnetic valve 61.
Additionally, as shown in Figure 4, the embodiment of the present invention also proposes a kind of multiple on-line system defrosting control in parallel
Method, implements based on above-described embodiment parallel connection multiple on-line system, and the method includes:
Step S10, when a wherein off-premises station defrost in described system, switches to the off-premises station of this defrost
Refrigeration mode；
Step S20, by first and second pipeline conducting of the off-premises station of this defrost, first and second closed electromagnetic valve；
First and second pipeline of other at least one off-premises station coordinated with the off-premises station of described defrost is turned on, first,
Two closed electromagnetic valves.
Wherein, the evaporation ends of the cross valve of the off-premises station of defrost and inlet end conducting, outlet side and condensation end
Conducting；The evaporation ends of the cross valve of the off-premises station coordinated with the off-premises station of described defrost and outlet side conducting,
Inlet end and condensation end conducting.
As a example by multiple on-line system in parallel includes three off-premises stations, the present embodiment scheme is described in detail.
As shown in the i.e. Fig. 3 of Fig. 2, multiple on-line system in parallel includes off-premises station 11, off-premises station 12, off-premises station
13, the first pipeline 51 of each off-premises station is connected with each other by connecting tube；Second pipeline 52 of each off-premises station
It is connected with each other by connecting tube.
During original state, off-premises station 11, off-premises station 12, off-premises station 13 all run under heating mode.
When setting off-premises station 11 needs defrost, with off-premises station 12, off-premises station 11 carries out defrost, certainly, also
Multiple off-premises station can be had to coordinate with the off-premises station of defrost, and the present embodiment enters with an off-premises station 12 coordinated
Row citing.Off-premises station 13 keeps normal heating mode to run.
When off-premises station 11 needs to carry out defrost, the off-premises station 11 of this defrost is switched to refrigeration mode；
And the first pipeline 51 and second pipeline 52 of the off-premises station 11 of this defrost are turned on, the first electromagnetic valve 61
Close with the second electromagnetic valve 62.
Additionally, the first pipeline 51 and second of the off-premises station 12 coordinated with the off-premises station 11 of this defrost is managed
Road 52 turns on, and the first electromagnetic valve 61 and the second electromagnetic valve 62 are closed.
As it is shown on figure 3, when off-premises station 11 carries out defrost, coolant during defrost flows to such as arrow in Fig. 3
Shown in.
In off-premises station 11 side, off-premises station 11 is switched to refrigeration mode, the four of off-premises station 11 by heating mode
Evaporation ends 31 and the inlet end 32 of logical valve 3 turn on, and outlet side 33 and condensation end 34 turn on, off-premises station
Compressor 2 air vent of 11 high temperature refrigerant out, through inlet end 32 and the evaporation ends 31 of cross valve 3
Entering heat exchanger 4 to carry out condensing heat release, liberated heat carries out defrost, from heat exchanger 4 to this heat exchanger 4
Low temperature coolant out is entered the first pipeline 51 of off-premises station 12 by the first pipeline 51.
In off-premises station 12 side, evaporation ends 31 and the outlet side 33 of the cross valve 3 of off-premises station 12 turn on,
Inlet end 32 and condensation end 34 turn on, the first pipeline 51 coolant entered is through heat exchanger 4 evaporation and heat-exchange
After, enter the second pipeline 52 of off-premises station 12 through the evaporation ends 31 of cross valve, outlet side 33, by outdoor
Second pipeline 52 of machine 12 returns to the second pipeline 52 of off-premises station 11 and enters the compressor of off-premises station 11,
Circulate with this.
Thus, the room of defrost can be made by corresponding first pipeline 51 and the second pipeline 52 and electromagnetic valve
In outer machine 11, condensed coolant is evaporated process in the condenser of another off-premises station 12, makes defrost
Time indoor there is not evaporation process, and wash away sound without coolant during commutation compared to existing technology so that
Indoor heat exchanger duty is not by defrost process influence.
Further, since the condenser that off-premises station 12 is evaporated can run blower fan, thus greatly improve
Defrost speed.
From said process, as three and above off-premises station parallel connection, rotation can carry out defrost process,
Remaining off-premises station still keeps heating state, and heating operations does not stops, and air-conditioner comfortable is thus greatly improved
Degree.
Need further exist for explanation, in above-described embodiment, the 3rd electromagnetic valve 63 and the first electromagnetic valve 61
Can merge and be substituted by a three-way valve, i.e. cancel the 3rd electromagnetic valve 63 of the first pipeline 51, and throttling dress
Put the first electromagnetic valve 61 between 9 and liquid side stop valve 71, then realized handoff functionality by three-way solenoid valve.
It addition, the 3rd electromagnetic valve 63 and second in above-described embodiment, on the first pipeline 51 of off-premises station
The 4th electromagnetic valve 64 on pipeline 52, directly correspondence can be arranged on each first pipeline 51 and second of connection
On the connecting line of pipeline 52, i.e. between throttling arrangement 9 and the first electromagnetic valve 61.
Embodiment of the present invention parallel connection multiple on-line system and defrosting method, when the outer machine system of parallel connection carries out defrost,
Disconnect towards the electromagnetic valve on indoor heat exchanger pipeline, condensation can be made by the first pipeline and the second pipeline
After coolant in the condenser of another off-premises station, be evaporated process, when making defrost, indoor is not steamed
The process of sending out, and wash away sound, so that indoor heat exchanger duty is not by defrost without coolant during commutation
Journey affects；And the condenser owing to being evaporated can run blower fan, greatly improve defrost speed.This
Outward, three and during above off-premises station parallel connection, rotation can carry out defrost process, remaining off-premises station still keeps system
Warm status, heating operations does not stops, and the comfort level of air-conditioner is greatly improved.
Above are only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every
Utilize equivalent structure or flow process conversion that description of the invention and accompanying drawing content made, or directly or indirectly transport
It is used in other relevant technical field, is the most in like manner included in the scope of patent protection of the present invention.
Claims (8)
1. a multiple on-line system in parallel, including at least two off-premises stations in parallel, described off-premises station includes pressure
Contracting machine, cross valve, outdoor heat exchanger and throttling arrangement, described throttling arrangement is by liquid side stop valve even
Connecing indoor set, the condensation end of described cross valve connects indoor set by gas side stop valve, it is characterised in that
Described off-premises station also includes the first pipeline and the second pipeline, wherein:
One end of described first pipeline is connected between described throttling arrangement and liquid side stop valve；
One end of described second pipeline be connected to the gas returning port of described compressor and cross valve exhaust end it
Between；
The other end of the first pipeline of each off-premises station is connected with each other；The other end of the second pipeline of each off-premises station
It is connected with each other；
The first electromagnetic valve and described first pipeline it is also associated with between described throttling arrangement and liquid side stop valve
One end is connected between described throttling arrangement and described first electromagnetic valve, the condensation end of described cross valve and gas
The second electromagnetic valve it is also associated with between the stop valve of side；
Wherein, when a wherein off-premises station defrost in described system, the off-premises station of this defrost is switched to system
Chill formula；
By first and second pipeline conducting of the off-premises station of this defrost, first and second closed electromagnetic valve；Will with institute
State first and second pipeline conducting of other at least one off-premises station of the off-premises station cooperation of defrost, first and second electricity
Magnet valve is closed；
The evaporation ends of the cross valve of the off-premises station of defrost and inlet end conducting, outlet side and condensation end conducting；
The evaporation ends of the cross valve of the off-premises station coordinated with the off-premises station of described defrost and outlet side conducting, inlet end
Turn on condensation end.
Multiple on-line system in parallel the most according to claim 1, it is characterised in that the of each off-premises station
The other end of one pipeline is connected with each other by connecting tube；The other end of the second pipeline of each off-premises station is by even
Adapter is connected with each other.
Multiple on-line system in parallel the most according to claim 1, it is characterised in that described first pipeline
Including the 3rd electromagnetic valve；Described second pipeline includes the 4th electromagnetic valve.
Multiple on-line system in parallel the most according to claim 3, it is characterised in that described 3rd electromagnetism
A three-way valve merged into by valve and described first electromagnetic valve.
5. according to the multiple on-line system in parallel according to any one of claim 1-4, it is characterised in that institute
The end stating the end of the other end of the first pipeline of off-premises station and the other end of the second pipeline connects respectively
Having a stop valve, after described off-premises station accesses multiple on-line system, described stop valve keeps opening state.
Multiple on-line system in parallel the most according to claim 5, it is characterised in that described off-premises station is
Three or more than.
Multiple on-line system in parallel the most according to claim 5, it is characterised in that described throttling arrangement
For electric expansion valve.
8. a multiple on-line system defrosting control method in parallel, it is characterised in that including:
When a wherein off-premises station defrost in described system, the off-premises station of this defrost is switched to refrigeration mode；
By first and second pipeline conducting of the off-premises station of this defrost, first and second closed electromagnetic valve；Will with institute
State first and second pipeline conducting of other at least one off-premises station of the off-premises station cooperation of defrost, first and second electricity
Magnet valve is closed；
The evaporation ends of the cross valve of the off-premises station of defrost and inlet end conducting, outlet side and condensation end conducting；
The evaporation ends of the cross valve of the off-premises station coordinated with the off-premises station of described defrost and outlet side conducting, inlet end
Turn on condensation end.
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| CN201410384064.6A CN104154672B (en) | 2014-08-06 | 2014-08-06 | Multiple on-line system in parallel and defrosting control method |
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| CN201410384064.6A CN104154672B (en) | 2014-08-06 | 2014-08-06 | Multiple on-line system in parallel and defrosting control method |
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| CN104154672B true CN104154672B (en) | 2016-08-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017006596A1 (en) * | 2015-07-06 | 2017-01-12 | 三菱電機株式会社 | Refrigeration cycle device |
| CN107490223B (en) * | 2017-09-18 | 2019-11-22 | 广东美的暖通设备有限公司 | Control method, system and the computer readable storage medium of multi-connected air conditioner |
| CN109140725B (en) * | 2018-08-31 | 2021-01-05 | 广东美的暖通设备有限公司 | Multi-split air conditioning system and defrosting control method thereof |
| CN108954898A (en) * | 2018-09-20 | 2018-12-07 | 珠海格力电器股份有限公司 | Evaporation condensing unit and control method thereof |
| CN109458699B (en) * | 2018-11-08 | 2020-08-11 | 珠海格力电器股份有限公司 | Multi-online defrosting method and device, storage medium, computer equipment and air conditioner |
| CN109708216A (en) * | 2018-12-06 | 2019-05-03 | 珠海格力电器股份有限公司 | Modular multi-split air conditioning system and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3208323B2 (en) * | 1996-04-30 | 2001-09-10 | 三洋電機株式会社 | Control method of multi-type air conditioner |
| KR100717444B1 (en) * | 2003-10-20 | 2007-05-14 | 엘지전자 주식회사 | Multi air conditioner and air conditioner control method |
| CN101476801B (en) * | 2009-01-14 | 2011-07-27 | 重庆美的通用制冷设备有限公司 | Continuously heating and defrosting heat pump type air conditioner |
| JP2014126310A (en) * | 2012-12-27 | 2014-07-07 | Hitachi Appliances Inc | Air conditioner |
| CN103225851B (en) * | 2013-04-27 | 2015-07-29 | 青岛海尔空调电子有限公司 | A kind of multi-gang air conditioner working in coordination with defrosting |
| CN103776191A (en) * | 2014-02-21 | 2014-05-07 | 广东志高暖通设备股份有限公司 | Multi-split air conditioner and heat pump system thereof |
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