CN106440462A - Air conditioning unit and control method thereof - Google Patents
Air conditioning unit and control method thereof Download PDFInfo
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- CN106440462A CN106440462A CN201611046041.XA CN201611046041A CN106440462A CN 106440462 A CN106440462 A CN 106440462A CN 201611046041 A CN201611046041 A CN 201611046041A CN 106440462 A CN106440462 A CN 106440462A
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- control valve
- pipeline
- outdoor heat
- heat exchange
- exchange device
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 66
- 238000010257 thawing Methods 0.000 claims abstract description 53
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 239000003507 refrigerant Substances 0.000 claims abstract description 25
- 239000002826 coolant Substances 0.000 claims description 57
- 238000001704 evaporation Methods 0.000 claims description 16
- 230000008020 evaporation Effects 0.000 claims description 14
- 238000005057 refrigeration Methods 0.000 claims description 7
- 238000010977 unit operation Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 10
- 239000007788 liquid Substances 0.000 abstract description 7
- 239000002918 waste heat Substances 0.000 abstract description 3
- 230000017525 heat dissipation Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- PIRWNASAJNPKHT-SHZATDIYSA-N pamp Chemical compound C([C@@H](C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)N[C@@H](C)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCNC(N)=N)C(N)=O)NC(=O)[C@H](CCC(O)=O)NC(=O)[C@H](CO)NC(=O)[C@H](C)NC(=O)[C@@H](NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](C)N)C(C)C)C1=CC=CC=C1 PIRWNASAJNPKHT-SHZATDIYSA-N 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioning unit and a control method thereof, relating to the technical field of air conditioning, wherein an outdoor heat exchanger comprises at least two outdoor heat exchange devices; the compressor, the four-way valve, the indoor heat exchanger, the throttling device and the at least two outdoor heat exchange devices are connected into a refrigerant loop, and a first control valve unit is arranged in the refrigerant loop; the compressor and the at least two outdoor heat exchange devices are connected to form a defrosting circuit, and a second control valve unit is arranged in the defrosting circuit. According to the air conditioning unit and the control method of the air conditioning unit, heating and defrosting of the air conditioning unit are simultaneously carried out through the control valve, and the four-way valve is not reversed in the defrosting process; the liquid refrigerant after defrosting utilizes the heat of compressor operation in-process casing to evaporate, simultaneously through the reducing throttle design of pipeline for the waste heat of compressor cylinder body obtains effective utilization, can strengthen the heat dissipation of compressor simultaneously, can maintain indoor ambient temperature and not reduce, improves user experience.
Description
Technical field
The present invention relates to air-conditioning technique field, more particularly to a kind of air conditioning unit and air conditioning unit control method.
Background technology
In prior art, air conditioning unit in defrosting, by cutting typically in air conditioning unit heating condition running
Changing cross valve refrigeration mode is switched to by air conditioning unit.During defrosting, outdoor heat exchanger is used as condenser, and indoor heat exchanger is used as steaming
Device is sent out, inside and outside blower fan all shuts down, compressor is adjusted to the defrost frequency for setting, and the High Temperature High Pressure coolant of discharge is through cross valve
Enter in outdoor heat exchanger, outdoor heat exchanger is defrosted.As in defrosting, inner blower shuts down, air conditioning unit
Operational mode be refrigeration, indoor heat exchanger is relatively low as vaporizer, temperature in defrosting, also, defrost process can be persistently several
Minute, during this, indoor environment temperature can be caused to reduce, affect user's comfortableness.In addition, air conditioning unit can also pass through
Defrost is carried out using heat-storing material, and cross valve does not commutate, but the heat-storing material that uses of which and dependency structure design
Relatively costly, promote face narrower.
Content of the invention
In view of this, the invention solves the problems that a technical problem be that a kind of air conditioning unit and air conditioning unit control is provided
Method, by control valve realize air conditioning unit heat with defrost while carry out, and cross valve is not commutated, and improves user's body
Test.
According to an aspect of the present invention, one kind is provided air conditioning unit, including compressor, cross valve, throttling arrangement, interior
Heat exchanger and outdoor heat exchanger, the outdoor heat exchanger includes at least two outdoor heat exchange devices；The compressor, the four-way
Valve, the indoor heat exchanger, the throttling arrangement and at least two outdoor heat exchange device are connected as coolant loop, described
The first control valve unit is provided with coolant loop, and first control valve unit is used for controlling the coolant stream in the coolant loop
To and break-make；The compressor and at least two outdoor heat exchange device are connected as loop of defrosting, in the defrosting loop
In be provided with the second control valve unit, second control valve unit is used for controlling coolant in the defrosting loop to flow to and logical
Disconnected.
Alternatively, the quantity of the outdoor heat exchange device is that 2,2 outdoor heat exchange devices are respectively outside the room of upper strata
Heat-exchanger rig and lower floor's outdoor heat exchange device.
Alternatively, the outlet of the compressor and entrance first port and second port company respectively with the cross valve
Connect, the first end of the indoor heat exchanger is connected with the 3rd port of the cross valve, the second end of the indoor heat exchanger with
The first end connection of the throttling arrangement, the upper strata outdoor heat exchange device and lower floor's outdoor heat exchange device are located at simultaneously respectively
In the first pipeline and the second pipeline that connection is arranged, the junction point of one end of one end of first pipeline and second pipeline leads to
Cross the 4th port that the 3rd pipeline accesses the cross valve, the other end of the other end of first pipeline and second pipeline
Junction point be connected with the second end of the throttling arrangement, form the coolant loop.
Alternatively, first control valve unit includes：It is arranged on first pipeline and is located at outside the upper strata room
The first control valve between heat-exchanger rig and the cross valve；It is arranged on second pipeline and is located at outside the lower floor room
The second control valve between heat-exchanger rig and the cross valve；It is arranged on first pipeline and is located at outside the upper strata room
The 5th control valve between heat-exchanger rig and the throttling arrangement；It is arranged on second pipeline and is located at the lower chamber
The 6th control valve between outer heat-exchanger rig and the throttling arrangement.
Alternatively, one end of the 4th pipeline be connected to positioned at the 5th control valve and the upper strata outdoor heat exchange device it
Between the first pipeline on, one end of the 5th pipeline be connected to positioned at the 6th control valve and lower floor's outdoor heat exchange device it
Between the second pipeline on, the junction point of the other end of the 4th pipeline and the other end of the 5th pipeline is connected to the pressure
On the pipeline that the outlet of contracting machine is connected with the cross valve, one end of the 6th pipeline is connected to positioned at first control valve and institute
State on the first pipeline between the outdoor heat exchange device of upper strata, one end of the 7th pipeline is connected to positioned at second control valve and institute
State on the second pipeline between lower floor's outdoor heat exchange device, the other end of the 6th pipeline and the other end of the 7th pipeline
Junction point be connected on the 3rd pipeline by the 8th pipeline, form the defrosting loop.
Alternatively, second control valve unit includes：The 3rd control valve being arranged on the 7th pipeline；It is arranged on
The 4th control valve on 6th pipeline；The 7th control valve being arranged on the 4th pipeline；It is arranged on the 5th pipe
The 8th control valve on road.
Alternatively, the 8th pipeline includes to be wrapped in the refrigerant evaporation pipeline on the compressor housing surface, wherein, institute
The heat for stating compressor housing surface is carried out heating, evaporates to the coolant in the refrigerant evaporation pipeline.
Alternatively, the 8th pipeline includes the coolant throttle pipeline that caliber reduces, wherein, the coolant throttle pipeline position
Between the junction point of the other end of the other end and the 7th pipeline of the refrigerant evaporation pipeline and the 6th pipeline.
Alternatively, on lower floor's outdoor heat exchange device, temperature sensor is provided with, for detecting outside the lower floor room
The Guan Wen of heat-exchanger rig.
Alternatively, upper strata blower fan and lower floor's blower fan；The upper strata blower fan and lower floor's blower fan respectively with the upper chamber
Outer heat-exchanger rig and lower floor's outdoor heat exchange device are used cooperatively.
According to a further aspect in the invention, provide a kind of based on control method air conditioning unit as above, including：When
Air conditioning unit operate in refrigeration or heating mode under when, by the first control valve unit control coolant loop in coolant flow direction with
And break-make, and control coolant flow direction and the break-make in defrosting loop by the second control valve unit, make described air conditioning unit
Freezed or heated, and made described air conditioning unit heat with defrost while carrying out in a heating mode.
In accordance with a further aspect of the present invention, provide a kind of based on air conditioning unit control method as above, including：Work as air-conditioning
Unit operation in a heating mode when, judge whether to meet defrost condition；If meeting defrost condition, to lower floor's outdoor heat exchange
Device or upper strata outdoor heat exchange device carry out defrosting process；Judge whether that satisfaction exits defrost condition；If meeting and exiting defrost
Condition, then carry out defrosting process to upper strata outdoor heat exchange device or lower floor's outdoor heat exchange device；Wherein, controlled by control second
Valve, the 4th control valve, the 6th control valve, the 7th control valve be closed mode, and control the first control valve, the 3rd control valve,
5th control valve and the 8th control valve are opening, to carry out defrosting process to lower floor's outdoor heat exchange device；By control
Second control valve, the 4th control valve, the 7th control valve and the 6th control valve are opening, the 3rd control valve of control, the first control
Valve processed, the 5th control valve and the 8th control valve are closed mode, carry out defrosting process to upper strata outdoor heat exchange device.
Alternatively, judge whether to meet defrost termination condition；If meeting defrost termination condition, control first controls
Valve, the second control valve, the 5th control valve, the 6th control valve be opening, and control the 3rd control valve, the 4th control valve,
7th control valve and the 8th control valve are closed mode.
Alternatively, judge whether that meeting defrost termination condition includes：If first carried out to lower floor's outdoor heat exchange device
Defrosting is processed, then judge whether the air conditioning unit total duration for carrying out defrost reaches t1, meets defrost knot if it is, determining
Bundle condition；Wherein, t1 is the twice of the duration for carrying out defrost to lower floor's outdoor heat exchange device.
Alternatively, upper strata blower fan and lower floor blower fan respectively with the upper strata outdoor heat exchange device and lower floor's outdoor heat exchange
Device is used cooperatively, and methods described also includes：When defrosting process is carried out to lower floor's outdoor heat exchange device, control on described
Layer fan operation and lower floor's blower fan stopping；When defrosting process is carried out to the upper strata outdoor heat exchange device, under control is described
Layer fan operation and the stopping of upper strata blower fan.
Alternatively, when air conditioning unit operation in cooling mode when, then control the first control valve, the second control valve, the 5th
Control valve, the 6th control valve are opening, and control the 3rd control valve, the 4th control valve, the 7th control valve and the 8th control
Valve processed is closed mode.
The air conditioning unit and air conditioning unit control method of the present invention, realizes air conditioning unit heating and defrost by control valve
While carry out, and cross valve is not commutated during defrost；Liquid refrigerants after defrost utilizes compressor operating process
The heat of middle housing is evaporated, while by the reducing saving design of pipeline, it is ensured that evaporate more complete, it is not necessary to accumulation of heat material
Material；Outdoor heat exchanger adopts upper and lower two pieces single heat exchangers, realizes the friendship of levels outdoor heat exchanger by the switching of control valve
For defrost is carried out, indoor environment temperature can be maintained not reduce so that the waste heat of compressor casing is utilized effectively, while energy
Strengthen the radiating of compressor.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for technology description is had to be briefly described, it should be apparent that, drawings in the following description are only
Some embodiments of the present invention, for those of ordinary skill in the art, without having to pay creative labor, also
Other accompanying drawings can be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the air conditioning unit one embodiment according to the present invention；
Fig. 2 be according to the lower floor's outdoor heat exchange device in air conditioning unit one embodiment of the present invention defrosted cold
Matchmaker flows to schematic diagram；
Fig. 3 be according to the upper strata outdoor heat exchange device in air conditioning unit one embodiment of the present invention defrosted cold
Matchmaker flows to schematic diagram；
Fig. 4 is the schematic flow sheet of one embodiment of the air conditioning unit control method according to the present invention；
Fig. 5 is the schematic flow sheet of another embodiment of the air conditioning unit control method according to the present invention.
Specific embodiment
With reference to the accompanying drawings the present invention is described more fully, the exemplary embodiment of the present invention is wherein described.Under
Face will combine the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, be shown
So, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the reality in the present invention
Example is applied, the every other embodiment obtained under the premise of creative work is not made by those of ordinary skill in the art, all belong to
In the scope of protection of the invention.With reference to each figure and embodiment, many descriptions are carried out to technical scheme.
In the present invention, " first ", " second " etc. do not have other special implications for being distinguished by description.
As shown in figure 1, air conditioning unit including compressor 11, cross valve 16, throttling arrangement 13, indoor heat exchanger 12 and outdoor
Heat exchanger, outdoor heat exchanger includes at least two outdoor heat exchange devices.The quantity of outdoor heat exchange device can be 2,3 etc., can
To be determined according to design requirement.The installation site of outdoor heat exchange device can be for placing, placing up and down etc. side by side.
Compressor 11, cross valve 16, indoor heat exchanger 12, throttling arrangement 13 and at least two outdoor heat exchange devices are connected as
Coolant loop, is provided with the first control valve unit in coolant loop, and the first control valve unit is cold in coolant loop for controlling
Matchmaker's flow direction and break-make.Compressor 11 and at least two outdoor heat exchange devices are connected as loop of defrosting, and are provided with defrosting loop
Second control valve unit, the coolant flow direction in the second control valve unit control defrosting loop and break-make.
First control valve unit and the second control valve unit can include multiple control valves, by the first control valve unit control
In coolant loop processed coolant flow direction and break-make, by the second control valve unit control defrosting loop in coolant flow direction and
Break-make, can control air conditioning unit freezed or heated, and air conditioning unit heating and defrost can be made in a heating mode
While carry out, realizing heating is carried out with the synchronization of defrost, it is to avoid indoor temperature declines, and whole defrost process cross valve is not
Needs are commutated.
The quantity of outdoor heat exchange device is 2, and 2 outdoor heat exchange devices are respectively upper strata outdoor heat exchange device 14 and lower floor
Outdoor heat exchange device 15.The outlet of compressor 11 and entrance are connected with the first port of cross valve 16 and second port respectively, room
The first end of interior heat exchanger 12 is connected with the 3rd port of cross valve 16, the second end of indoor heat exchanger 12 and throttling arrangement 13
First end connects, and upper strata outdoor heat exchange device 14 and lower floor's outdoor heat exchange device 15 are located at the first pipeline 31 being arranged in parallel respectively
In the second pipeline 32, the junction point of one end of one end of the first pipeline 31 and the second pipeline 32 accesses four by the 3rd pipeline 33
4th port of port valve 16, one end of one end of the first pipeline 31 and the second pipeline 32 can also be directly accessed the of cross valve 16
Four ports, the junction point of the other end of the other end of the first pipeline 31 and the second pipeline 32 is connected with the second end of throttling arrangement 13
Connect, form coolant loop.
In order to 11 times liquid of compressor are prevented, gas-liquid separator 17 can be increased before 11 air-breathing of compressor.11 energy of compressor
Enough constantly extractions and discharge coolant (also referred to as cold-producing medium).Indoor heat-exchanger rig 12 is arranged at the heat exchange dress of interior when being and using
Put, outdoor heat exchange device be using when be arranged at outdoor heat-exchange device.Throttling arrangement 13 can be choke valve, to coolant
The effect of reducing pressure by regulating flow is carried out, choke valve 4 can adopt heating power expansion valve, electric expansion valve or restricting orifice etc..
The first control valve unit for arranging in coolant loop includes：It is arranged on the first pipeline 31 and is located at upper chamber
The first control valve 21 between outer heat-exchanger rig 14 and cross valve 16.It is arranged on the second pipeline 32 and is located at outside lower floor room and changes
The second control valve 22 between thermal 15 and cross valve 16.It is arranged on the first pipeline 31 and is located at upper strata outdoor heat exchange dress
Put the 5th control valve 25 between 14 and throttling arrangement 13.It is arranged on the second pipeline 32 and is located at lower floor's outdoor heat exchange device
The 6th control valve 26 between 15 and throttling arrangement 13.Control valve can have polytype, for example, electromagnetic valve etc..
One end of 4th pipeline 34 is connected between the 5th control valve 25 and upper strata outdoor heat exchange device 14 first
On pipeline 31, one end of the 5th pipeline 35 is connected between the 6th control valve 26 and lower floor's outdoor heat exchange device 15 second
On pipeline 32, the junction point of the other end of the 4th pipeline 34 and the other end of the 5th pipeline 35 be connected to the outlet of compressor 11 with
On the pipeline that cross valve 16 connects, one end of the 6th pipeline 36 is connected to positioned at the first control valve 21 and upper strata outdoor heat exchange device
On the first pipeline 31 between 14, one end of the 7th pipeline 37 is connected to positioned at the second control valve 22 and lower floor's outdoor heat exchange device
On the second pipeline 32 between 15, the junction point of the other end of the 6th pipeline 36 and the other end of the 7th pipeline 37 is managed by the 8th
Road 38 is connected on the 3rd pipeline 33, and the other end of the 6th pipeline 36 and the other end of the 7th pipeline 37 can also be directly connected to
4th port of cross valve 16, forms defrosting loop.
The second control valve unit for arranging in defrosting loop includes：The 3rd control valve being arranged on the 7th pipeline 35
23, the 4th control valve 24 being arranged on the 6th pipeline 36, the 7th control valve 27 being arranged on the 4th pipeline 34, it is arranged on
The 8th control valve 28 on five pipelines 35.
Outdoor heat exchange device is divided into upper and lower two pieces single heat exchangers, can realize stratification by control valve unit
Frost.For example, the frost of Xian Hua lower floor outdoor heat exchanger, upper strata outdoor heat exchanger keeps evaporating state, Hua Wan lower floor outdoor heat exchanger
Frost after, defrost is carried out to upper strata outdoor heat exchanger by the switching of control valve unit.
Upper strata outdoor heat exchange device 14 and lower floor's outdoor heat exchange device 15 can be two pieces of identical heat exchangers, upper and lower two-layer
The frosting area of outdoor heat exchanger and thickness are close, but the effect due to gravity, the frost layer upper layer of lower floor's outdoor heat exchanger
Outdoor heat exchanger is slightly thicker, and therefore, pipe temperature only need to be arranged in lower floor's outdoor heat exchanger, and upper strata outdoor heat exchanger need not be carried out
Pipe stupe is put.Temperature sensor is provided with lower floor's outdoor heat exchange device 15, and temperature sensor can be arranged on outside lower floor room
The bottom of heat-exchanger rig 15, for detecting the Guan Wen of lower floor's outdoor heat exchange device, the temperature for being gathered by temperature sensor is permissible
Judge whether to need defrost.
Air conditioning unit start, the operational mode for setting as refrigeration mode or heating mode, by switching the work of cross valve 16
Make position can make air conditioning unit switch in cooling or heating mode, the first control valve 21 of control, the second control valve 22, the
Five control valves 25, the 6th control valve 26 are opening, and control the 3rd control valve 23, the 4th control valve 24, the 7th control
Valve 27 and the 8th control valve 28 are closed mode, air conditioning unit to be freezed or heated.
By taking heating mode as an example, the high temperature refrigerant of the output of compressor 11 gets in heat exchanger 12 through cross valve 16 to be carried out
Heat exchange, coolant enters upper strata outdoor heat exchange device 14 by throttling arrangement 13 and respectively by the first pipeline 31 and the second pipeline 32
Heat exchange is carried out with lower floor outdoor heat exchange device 15, the coolant after heat exchange flows back to cross valve 16 by the 3rd pipeline 33, enter compression
The entrance of machine 11, completes circulation.
In the running for heating, the air conditioning unit defrost condition for whether reaching setting is persistently detected, defrost condition can
Multiple to have, can be configured according to specific design requirement.If being unsatisfactory for defrost condition, air conditioning unit all of control
Valve processed state of remaining stationary is constant.If defrost condition is reached, defrost process is carried out, can be to 14 He of upper strata outdoor heat exchange device
Lower floor's outdoor heat exchange device 15 carries out defrost process respectively.
As shown in Fig. 2 the second control valve 22 of control, the 4th control valve 24, the 6th control valve 26, the 7th control valve 27 are for closing
Closed state, and control the first control valve 21, the 3rd control valve 23, the 5th control valve 25 and the 8th control valve 28 for opening shape
State, carries out defrosting process to lower floor's outdoor heat exchange device 15.
The high temperature refrigerant that compressor 11 is exported is divided into two parts, and a part gets in heat exchanger 12 through cross valve 16 and enters
Row heat exchange, coolant is led to by throttling arrangement 13 and after the entrance of the first pipeline 31 upper strata outdoor heat exchange device 14 carries out heat exchange
Cross the 3rd pipeline 33 and cross valve 16 is flowed back to, the entrance of compressor 11 is entered, complete circulation.
As the outlet that the junction point of the 4th pipeline 34 and the 5th pipeline 35 is connected to compressor 11 is connected with cross valve 16
Pipeline on, another part high temperature refrigerant that compressor 11 is exported enters lower chamber by the 5th pipeline 35 and the second pipeline 32
Outer heat-exchanger rig 15 carries out heat exchange defrosting process, and the coolant after heat exchange sequentially passes through the 7th pipeline 37, the 8th pipeline 38 and
Three pipelines 33 flow back to cross valve 16, enter the entrance of compressor 11, complete circulation.
Exiting defrost condition can have multiple, can be configured according to specific design requirement.If as shown in figure 3,
Meet and defrost condition is exited, then defrosting process is carried out to upper strata outdoor heat exchange device 14.Control the second control valve 22, the 4th control
Valve 24, the 7th control valve 27 and the 6th control valve 26 be opening, and control the 3rd control valve 23, the first control valve 21,
5th control valve 25 and the 8th control valve 28 are closed mode, to carry out defrosting process to upper strata outdoor heat exchange device.
Compressor 11 exports a part of high temperature refrigerant and gets in heat exchanger 12 through cross valve 16 and carries out heat exchange, and coolant leads to
Cross throttling arrangement 13 and after the entrance of the second pipeline 32 lower floor outdoor heat exchange device 15 carries out heat exchange, flowed by the 3rd pipeline 33
Cross valve 16 is returned, the entrance of compressor 11 is entered, complete circulation.
As the outlet that the junction point of the 4th pipeline 34 and the 5th pipeline 35 is connected to compressor 11 is connected with cross valve 16
Pipeline on, another part high temperature refrigerant that compressor 11 is exported enters upper chamber by the 4th pipeline 34 and the first pipeline 31
Outer heat-exchanger rig 14 carries out heat exchange defrosting process, and the coolant after heat exchange sequentially passes through the 6th pipeline 36, the 8th pipeline 38 and
Three pipelines 33 flow back to cross valve 16, enter the entrance of compressor 11, complete circulation.
Air conditioning unit if meeting defrost termination condition during defrost, then after defrost terminates, control first control
Valve 21, the second control valve 22, the 5th control valve 25, the 6th control valve 26 be opening, and control the 3rd control valve 23, the
Four control valves 24, the 7th control valve 27 and the 8th control valve 28 are closed mode, air conditioning unit being heated.
8th pipeline 38 includes the refrigerant evaporation pipeline 39 for being wrapped in 11 surface of shell of compressor, using compression case body surface
The heat in face is carried out heating, evaporates to the coolant in refrigerant evaporation pipeline 39.8th pipeline 38 also includes the coolant that caliber reduces
Throttling pipeline, coolant throttle pipeline is Wei Yu refrigerant evaporation pipeline 39 and the 6th pipeline 36 and the junction point of the 7th pipeline between.Change
Liquid refrigerants after frost, is evaporated using the heat of housing during compressor operating, while being throttled by the reducing of pipeline
Design, it is ensured that evaporate more complete, it may not be necessary to heat-storing material.
According to most of air conditioning unit experimental test data, in actual motion, compressor housing has 15 DEG C of mistake
Heat.During defrost, as the coolant for participating in defrost is cooled, therefore this part of coolant cannot directly enter compressor air suction
Mouthful, it is necessary to using thermal source, the part coolant is evaporated, compressor can pass through as the thermal source of this part of refrigerant evaporation
Refrigerant evaporation pipeline 39 is set on compressor housing surface, (thermaltransmission mode) is evaporated using the heat of compressor housing.
As condensed pressure is higher, i.e., saturation temperature is higher, in order to be able to make coolant more fully evaporate, by reducing
The coolant throttle pipeline that the caliber of pipe network, i.e. caliber reduce, reaches the purpose of reducing pressure by regulating flow.Nothing using compressor itself housing
Effect heat is evaporated to participating in the coolant after defrost, in order to more fully evaporate liquid refrigerants, is entered compressor surface and is changed
Before hot device, refrigerant pipeline has the design that a caliber reduces suddenly, for example, the diameter of refrigerant evaporation pipeline 39 byIt is changed intoSo that a part of coolant shwoot, while reduce evaporating temperature, preferably to absorb the heat of compressor.
Upper strata blower fan is coordinated with upper strata outdoor heat exchange device 14 and lower floor's outdoor heat exchange device 15 respectively with lower floor blower fan to be made
With.When defrosting process is carried out to lower floor's outdoor heat exchange device 15, control lower floor blower fan is out of service, and upper strata blower fan maintains operation
State.When defrosting process is carried out to upper strata outdoor heat exchange device 14, control lower floor's fan operation and upper strata blower fan stops.
Upper strata blower fan is all to play a part of to strengthen heat exchange with lower floor blower fan, under the state that heats (non-defrost), due to room
External heat exchanger needs evaporation, and in order to ensure evaporation effect, blower fan needs to open and strengthens heat exchange, result in the temperature drop of condenser
Low, beginning frosting that at low ambient temperatures can be slowly.Under refrigerating state, outdoor heat exchanger needs to enter coolant
Row condensation, the unlatching of blower fan is conducive to the condensation of coolant.Close blower fan to change mainly for ensureing outdoor when air conditioning unit defrost
The temperature of hot device, beneficial to defrost, as long as upper strata blower fan and lower floor blower fan ensure that corresponding upper strata outdoor heat exchange is filled respectively installing
Put 14 and lower floor's outdoor heat exchange device 15.
In one embodiment, provide a kind of based on air conditioning unit control method as above, operate in when air conditioning unit
When under refrigeration or heating mode, control coolant flow direction and the break-make in coolant loop by the first control valve unit, and lead to
Cross the second control valve unit control defrosting loop in coolant flow direction and break-make, make air conditioning unit freezed or heated, and
And make air conditioning unit heating with defrost while carrying out in a heating mode.
Fig. 4 is the schematic flow sheet of one embodiment of the air conditioning unit control method according to the present invention, as Fig. 4 institute
Show：
Step 401, when air conditioning unit operation in a heating mode, judges whether to meet defrost condition.
Step 402, if meeting defrost condition, removes to lower floor's outdoor heat exchange device or upper strata outdoor heat exchange device
Frost is processed.
Step 403, judges whether that satisfaction exits defrost condition, if meet exiting defrost condition, to changing outside the room of upper strata
Thermal or lower floor's outdoor heat exchange device carry out defrosting process.
Wherein, by controlling the second control valve, the 4th control valve, the 6th control valve, the 7th control valve for closed mode, and
And the first control valve of control, the 3rd control valve, the 5th control valve and the 8th control valve are to fill opening, to lower floor's outdoor heat exchange
Putting carries out defrosting process.It is unlatching shape by controlling the second control valve, the 4th control valve, the 7th control valve and the 6th control valve
State, the 3rd control valve of control, the first control valve, the 5th control valve and the 8th control valve are closed mode, to upper strata outdoor heat exchange
Device carries out defrosting process.
Fig. 5 is the schematic flow sheet of another embodiment of the air conditioning unit control method according to the present invention, as Fig. 5 institute
Show：
Step 501, controls air conditioning unit start by remote control etc..
Step 502, judges air conditioning unit mode of operation, if refrigeration mode, then enters step 503, if system
Heat pattern, then enter step 504.
Step 503, the first control valve of control, the second control valve, the 5th control valve, the 6th control valve are opening, and
And the 3rd control valve of control, the 4th control valve, the 7th control valve and the 8th control valve are closed mode, air conditioning unit system
Cold.
Step 504, the first control valve of control, the second control valve, the 5th control valve, the 6th control valve are opening, and
And the 3rd control valve of control, the 4th control valve, the 7th control valve and the 8th control valve are closed mode, air conditioning unit system
Heat.
Step 505, in a heating mode, judges whether to meet defrost condition, if it is, step 507 is entered, if
No, enter step 506.For example, defrost condition can include：Whether the temperature of train condenser reaches the defrost temperature of setting
Whether (such as -7 DEG C), heat pamp reach minimum heat pamp (such as 40min) of setting etc., and conditions above can be simultaneously
Relation.
Step 506, does not carry out defrost process.
Step 507, the second control valve of control, the 4th control valve, the 6th control valve, the 7th control valve are closed mode, and
And control the first control valve, the 3rd control valve, the 5th control valve and the 8th control valve to be opening, and close lower floor's blower fan,
Defrosting process is carried out to lower floor's outdoor heat exchange device.
Step 508, judges whether that satisfaction exits defrost condition, if it is, step 510 is entered, if it is not, then entering step
Rapid 509, exit the Guan Wen that defrost condition can be the outer heat-exchanger rig of lower chamber and reach default temperature (such as 15 degree) etc..
Step 509, air conditioning unit maintains original state.
Step 510, the second control valve of control, the 4th control valve, the 7th control valve and the 6th control valve are opening, to control
Make the 3rd control valve, the first control valve, the 5th control valve and the 8th control valve to be closed mode, and close upper strata blower fan, to upper
Layer outdoor heat exchange device carries out defrosting process.
When defrosting process is carried out to lower floor's outdoor heat exchange device, control upper strata fan operation and lower floor's blower fan stops；
When defrosting process is carried out to upper strata outdoor heat exchange device, control lower floor's fan operation and upper strata blower fan stops.
Step 511, judges whether to meet defrost termination condition, if it is, step 513 is entered, if it is not, then entering step
Rapid 512.
Step 512, continues to carry out defrost process to upper strata outdoor heat exchanger.
Step 513, terminates defrost process, the first control valve of control, the second control valve, the 5th control valve, the 6th control valve
For opening, and control the 3rd control valve, the 4th control valve, the 7th control valve and the 8th control valve be closed mode, empty
Unit is adjusted to be heated.
Judge whether to meet defrost termination condition have multiple.For example, if first defrosted to lower floor's outdoor heat exchange device
Processing, then judge whether the air conditioning unit total duration for carrying out defrost reaches t1, defrost termination condition is met if it is, determining.
T1 is the twice for carrying out defrosting duration to lower floor's outdoor heat exchange device, and such as t1 can be 3-10 minute, and optimal value is on a 4Min left side
Right.As condensed water is affected by gravity, the frost layer of lower floor's outdoor heat exchange device is more severe than upper strata outdoor heat exchanger,
So carried out with the time of lower floor's outdoor heat exchange device defrost the defrost of upper strata outdoor heat exchange device be change enough clean.
Air conditioning unit and air conditioning unit control method in above-described embodiment, realizes air conditioning unit heating by control valve
With defrost while carrying out, and cross valve is not commutated during defrost；Liquid refrigerants after defrost is transported using compressor
During row, the heat of housing is evaporated, while by the reducing saving design of pipeline, it is ensured that evaporate more complete, it is not necessary to
Heat-storing material；Outdoor heat exchanger adopts upper and lower two pieces single heat-exchanger rigs, is realized outside levels room by the switching of control valve
Heat-exchanger rig carries out alternately defrost, while can not commutating cross valve is solved and carry out defrost, maintains indoor environment temperature
Do not reduce, and the waste heat of compressor casing can be caused to be utilized effectively by the control of control valve, while compression can be strengthened
The radiating of machine, improves the comfortableness in room, improves Consumer's Experience.
The method of the present invention and system may be achieved in many ways.For example, can pass through software, hardware, firmware or
Software, hardware, any combinations of firmware are realizing the method for the present invention and system.For said sequence the step of method it is only
In order to illustrate, order described in detail above is not limited to the step of the method for the present invention, especially says unless otherwise
Bright.Additionally, in certain embodiments, also the present invention can be embodied as recording program in the recording medium, these programs include
For realizing the machine readable instructions of the method according to the invention.Thus, the present invention also covers storage for executing according to this
The recording medium of the program of bright method.
Description of the invention is given for the sake of example and description, and be not exhaustively or by the present invention
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Select and retouch
It is in order to the principle of the present invention and practical application are more preferably described to state embodiment, and so that one of ordinary skill in the art is managed
The present invention is so as to design the various embodiments with various modifications for being suitable to special-purpose for solution.
Claims (16)
1. a kind of air conditioning unit, including compressor (11), cross valve (16), throttling arrangement (13), indoor heat exchanger (12) and room
External heat exchanger, it is characterised in that：
The outdoor heat exchanger includes at least two outdoor heat exchange devices；Compressor (11), the cross valve (16), described
Indoor heat exchanger (12), the throttling arrangement (13) and at least two outdoor heat exchange device are connected as coolant loop, in institute
State in coolant loop and the first control valve unit is provided with, first control valve unit is used for controlling the coolant in the coolant loop
Flow direction and break-make；Compressor (11) and at least two outdoor heat exchange device are connected as loop of defrosting, and remove described
The second control valve unit is provided with white loop, and second control valve unit is used for controlling the coolant in the defrosting loop to flow to
And break-make.
2. air conditioning unit as claimed in claim 1, it is characterised in that
The quantity of the outdoor heat exchange device is 2, and 2 outdoor heat exchange devices are respectively upper strata outdoor heat exchange device (14)
With lower floor's outdoor heat exchange device (15).
3. air conditioning unit as claimed in claim 2, it is characterised in that
The outlet of compressor (11) and entrance are connected with the first port of the cross valve (16) and second port respectively, institute
The first end for stating indoor heat exchanger (12) is connected with the 3rd port of the cross valve (16), and the of indoor heat exchanger (12)
Two ends are connected with the first end of the throttling arrangement (13), upper strata outdoor heat exchange device (14) and lower floor's outdoor heat exchange
Device (15) is located in the first pipeline (31) and the second pipeline (32) being arranged in parallel respectively, the one end of the first pipeline (31)
The 4th port of cross valve (16) is accessed by the 3rd pipeline (33) with the junction point of the one end of the second pipeline (32),
The junction point of the other end of the other end of the first pipeline (31) and second pipeline (32) and the throttling arrangement (13)
The connection of the second end, form the coolant loop.
4. air conditioning unit as claimed in claim 3, it is characterised in that first control valve unit includes：
Be arranged on described first pipeline (31) upper and be located at upper strata outdoor heat exchange device (14) and the cross valve (16) it
Between the first control valve (21)；
Be arranged on described second pipeline (32) upper and be located at lower floor's outdoor heat exchange device (15) and the cross valve (16) it
Between the second control valve (22)；
It is arranged on described first pipeline (31) above and is located at upper strata outdoor heat exchange device (14) and the throttling arrangement (13)
Between the 5th control valve (25)；
It is arranged on described second pipeline (32) above and is located at lower floor's outdoor heat exchange device (15) and the throttling arrangement (13)
Between the 6th control valve (26).
5. air conditioning unit as claimed in claim 4, it is characterised in that
One end of 4th pipeline (34) is connected to positioned at the 5th control valve (25) and upper strata outdoor heat exchange device (14)
Between the first pipeline (31) on, one end of the 5th pipeline (35) is connected to positioned at the 6th control valve (26) and the lower floor
On the second pipeline (32) between outdoor heat exchange device (15), the other end of the 4th pipeline (34) and the 5th pipeline
(35) junction point of the other end is connected on the pipeline that the outlet of the compressor (11) is connected with the cross valve (16), the
One end of six pipelines (36) is connected between the first control valve (21) and upper strata outdoor heat exchange device (14)
On first pipeline (31), one end of the 7th pipeline (37) is connected to outside positioned at the second control valve (22) with the lower floor room to be changed
On the second pipeline (32) between thermal (15), the other end of the 6th pipeline (36) and the 7th pipeline (37) another
The junction point of one end is connected on the 3rd pipeline (33) by the 8th pipeline (38), forms the defrosting loop.
6. air conditioning unit as claimed in claim 5, it is characterised in that second control valve unit includes：
The 3rd control valve (23) being arranged on the 7th pipeline (35)；
The 4th control valve (24) being arranged on the 6th pipeline (36)；
The 7th control valve (27) being arranged on the 4th pipeline (34)；
The 8th control valve (28) being arranged on the 5th pipeline (35).
7. air conditioning unit as claimed in claim 5, it is characterised in that
8th pipeline (38) includes the refrigerant evaporation pipeline (39) for being wrapped in the compressor (11) surface of shell, wherein,
The heat on the compressor housing surface is carried out heating, evaporates to the coolant in refrigerant evaporation pipeline (39).
8. air conditioning unit as claimed in claim 7, it is characterised in that
The coolant throttle pipeline that 8th pipeline (38) is reduced including caliber, wherein, the coolant throttle pipeline is located at described
The junction point of the other end and the other end of seventh pipeline (37) of the refrigerant evaporation pipeline (39) with the 6th pipeline (36)
Between.
9. air conditioning unit as claimed in claim 1, it is characterised in that
Temperature sensor is provided with lower floor's outdoor heat exchange device, for detecting the pipe of lower floor's outdoor heat exchange device
Temperature.
10. air conditioning unit as claimed in claim 1, it is characterised in that also to include：
Upper strata blower fan and lower floor's blower fan；
The upper strata blower fan is joined with the upper strata outdoor heat exchange device and lower floor's outdoor heat exchange device respectively with lower floor's blower fan
Close and use.
11. a kind of air conditioning unit control methods based on as described in any one of claim 1 to 10, it is characterised in that include：
When air conditioning unit operating under refrigeration or heating mode, the coolant in coolant loop is controlled by the first control valve unit
Flow direction and break-make, and control coolant flow direction and the break-make in defrosting loop by the second control valve unit, make the sky
Adjust unit to be freezed or heated, and make described air conditioning unit heat with defrost while carrying out in a heating mode.
12. is a kind of based on control method air conditioning unit as claimed in claim 6, it is characterised in that includes：
When air conditioning unit operation in a heating mode, judge whether to meet defrost condition；
If meeting defrost condition, defrosting process is carried out to lower floor's outdoor heat exchange device or upper strata outdoor heat exchange device；
Judge whether that satisfaction exits defrost condition；If meeting and exiting defrost condition, to upper strata outdoor heat exchange device or lower floor
Outdoor heat exchange device carries out defrosting process；
Wherein, by controlling the second control valve, the 4th control valve, the 6th control valve, the 7th control valve for closed mode, and control
It is to fill opening, to lower floor's outdoor heat exchange to make the first control valve, the 3rd control valve, the 5th control valve and the 8th control valve
Putting carries out defrosting process；
It is opening, and controls the by controlling the second control valve, the 4th control valve, the 7th control valve and the 6th control valve
Three control valves, the first control valve, the 5th control valve and the 8th control valve are closed mode, and upper strata outdoor heat exchange device is removed
Frost is processed.
13. methods as claimed in claim 12, it is characterised in that
Judge whether to meet defrost termination condition；If meeting defrost termination condition, control the first control valve, the second control
Valve, the 5th control valve, the 6th control valve be opening, and control the 3rd control valve, the 4th control valve, the 7th control valve and
8th control valve is closed mode.
14. methods as claimed in claim 13, it is characterised in that judge whether that meeting defrost termination condition includes：
If first carrying out defrosting process to lower floor's outdoor heat exchange device, judge described air conditioning unit carry out defrost total when
Whether length reaches t1, meets defrost termination condition if it is, determining；
Wherein, t1 is the twice of the duration for carrying out defrost to lower floor's outdoor heat exchange device.
15. methods as claimed in claim 12, it is characterised in that upper strata blower fan and lower floor blower fan respectively with the upper strata room outside
Heat-exchanger rig and lower floor's outdoor heat exchange device are used cooperatively, and methods described also includes：
When defrosting process is carried out to lower floor's outdoor heat exchange device, control the upper strata fan operation and lower floor's blower fan stops
Only；
When defrosting process is carried out to the upper strata outdoor heat exchange device, control lower floor's fan operation and upper strata blower fan stops
Only.
16. methods as claimed in claim 12, it is characterised in that also include：
When air conditioning unit operation in cooling mode when, then control the first control valve, the second control valve, the 5th control valve, the 6th
Control valve is opening, and controls the 3rd control valve, the 4th control valve, the 7th control valve and the 8th control valve for closing shape
State.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611046041.XA CN106440462A (en) | 2016-11-22 | 2016-11-22 | Air conditioning unit and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611046041.XA CN106440462A (en) | 2016-11-22 | 2016-11-22 | Air conditioning unit and control method thereof |
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| CN106440462A true CN106440462A (en) | 2017-02-22 |
Family
ID=58218042
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| CN201611046041.XA Pending CN106440462A (en) | 2016-11-22 | 2016-11-22 | Air conditioning unit and control method thereof |
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| CN107560000A (en) * | 2017-10-23 | 2018-01-09 | 刘丽华 | A kind of desktop Portable air-conditioning |
| CN108007016A (en) * | 2017-10-30 | 2018-05-08 | 珠海格力电器股份有限公司 | Heat pump system and control method for heat pump system |
| CN108189640A (en) * | 2017-11-22 | 2018-06-22 | 珠海格力电器股份有限公司 | Heat exchange control device, air conditioner and control method of air conditioner |
| CN108386980A (en) * | 2018-03-05 | 2018-08-10 | 奥克斯空调股份有限公司 | A kind of air-conditioning defrosting control method and device |
| CN108826583A (en) * | 2018-05-30 | 2018-11-16 | 珠海格力电器股份有限公司 | Defrosting control method and device of air conditioning system |
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| CN110779165A (en) * | 2019-11-15 | 2020-02-11 | 宁波奥克斯电气股份有限公司 | Defrosting system, control method and air conditioner |
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| WO2021169261A1 (en) * | 2020-02-26 | 2021-09-02 | 浙江中广电器股份有限公司 | Air conditioner and control method for achieving defrosting during heating thereof |
| CN114135946A (en) * | 2021-11-01 | 2022-03-04 | 珠海格力电器股份有限公司 | Defrosting system and method of air conditioner and air conditioner |
| CN114370692A (en) * | 2022-02-28 | 2022-04-19 | 海信（广东）空调有限公司 | Air conditioner and control method thereof |
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| CN111397045A (en) * | 2020-04-20 | 2020-07-10 | 珠海格力电器股份有限公司 | Unit based on semiconductor heat exchanger, control method thereof and air conditioner |
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| CN114135946A (en) * | 2021-11-01 | 2022-03-04 | 珠海格力电器股份有限公司 | Defrosting system and method of air conditioner and air conditioner |
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Application publication date: 20170222 |