CN103673138A - Air conditioner and control method thereof - Google Patents
Air conditioner and control method thereof Download PDFInfo
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- CN103673138A CN103673138A CN201310741091.XA CN201310741091A CN103673138A CN 103673138 A CN103673138 A CN 103673138A CN 201310741091 A CN201310741091 A CN 201310741091A CN 103673138 A CN103673138 A CN 103673138A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 238000007710 freezing Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000003507 refrigerant Substances 0.000 abstract description 23
- 238000004378 air conditioning Methods 0.000 abstract description 3
- 238000010257 thawing Methods 0.000 abstract description 3
- 238000004781 supercooling Methods 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 9
- 230000002528 anti-freeze Effects 0.000 description 8
- 238000005057 refrigeration Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention relates to an air conditioner and a control method thereof. The air conditioner comprises an outdoor unit, an indoor unit, a four-way valve, a compressor and a gas-liquid separator, wherein the outdoor unit, the indoor unit, the four-way valve, the compressor and the gas-liquid separator are connected through a connecting pipe, a gas exhausting pipe of the compressor is connected with a first valve port of the four-way valve, a gas returning pipe of the compressor is connected with the outlet end of the gas-liquid separator, and the air conditioner further comprises a first loop, a second loop and a third loop. According to the air conditioner, the defrosting efficiency of the air conditioner in the cold region can be improved, and the condenser depression of air conditioning refrigerants and the stability of air conditioner performance can be improved.
Description
Technical field
The present invention relates to air-conditioning technical field, relate in particular to a kind of air-conditioner and control method thereof of cold district defrost.
Background technology
At present, air-conditioner has become the capital equipment that improves indoor environment in human lives.At cold district, because off-premises station is exposed in outdoor environment, air-conditioner is under heating mode, the reasons such as fan airstream distribution due to frame mode and the off-premises station of off-premises station, at off-premises station, dispel the heat undesirable in the situation that, the low temperature of outdoor environment all easily makes bottom and the chassis portion frosting of the finned heat exchanger in off-premises station or is frozen in, and the overall performance of air-conditioner will decline greatly in off-premises station frosting or while being frozen in, as the drainability of air-conditioner weakens, heating load greatly reduces etc., the defrosting method of some air-conditioners that provide in prior art when cold district is used, as increased pipeline between the heat exchanger at off-premises station and compressor, but the defrost time is long and defrost is thorough not etc., defrost efficiency is still not high enough, affect to a great extent user's comfort level.
As shown in Figure 1, the defrosting system of traditional air-conditioner comprises: off-premises station 10, indoor set 20, cross valve 30, compressor 60 and gas-liquid separator 70.Wherein, the muffler 602 of compressor 60 is connected with the port of export of gas-liquid separator 70, and four valve ports of cross valve 30 are connected with the arrival end of blast pipe 601, off-premises station 10, indoor set 20 and the gas-liquid separator 70 of compressor 60 respectively.Under refrigeration mode, compressor 60 will become the gas refrigerant of HTHP after the refrigerant compression of the gas-liquid mixed of low-temp low-pressure out from indoor set 20, the gas refrigerant of HTHP enters off-premises station 10, the cold-producing medium of temperature in the heat exchanger of off-premises station 10 is cooled to high pressure, in high pressure, the refrigerant temperature of temperature is also higher, and outdoor temperature is lower, therefore, in high pressure, the degree of supercooling of the cold-producing medium of temperature is lower, and when variable working condition, air-conditioner is unstable.
Summary of the invention
Main purpose of the present invention is to provide a kind of air-conditioner and control method thereof, is intended to improve air-conditioner in the defrost efficiency of cold district, improves the degree of supercooling of air-conditioning refrigerant and the stability of household air-conditioner.
In order to achieve the above object, the present invention proposes a kind of air-conditioner, comprise the off-premises station, indoor set, cross valve, compressor and the gas-liquid separator that by tube connector, are connected, the blast pipe of described compressor is connected with the first valve port of described cross valve, the muffler of described compressor is connected with the port of export of described gas-liquid separator, also comprises the first loop, second servo loop and tertiary circuit;
Described the first loop comprises that the second valve port, indoor set, the defrost pipeline, first of the described cross valve connecting successively regulate pipeline, off-premises station, the 3rd valve port of cross valve, the 4th valve port of cross valve and the arrival end of gas-liquid separator, and described defrost pipeline is installed on the chassis of described off-premises station; Described second servo loop comprises that the 3rd valve port, the off-premises station, first of the described cross valve connecting successively regulate pipeline, second to regulate the arrival end of pipeline and gas-liquid separator, and described first regulates pipeline to be installed on the lower end of the heat exchanger of described off-premises station; And described tertiary circuit comprises that the 3rd valve port of the described cross valve connecting successively, off-premises station, first regulate pipeline, defrost pipeline, indoor set, the second valve port of cross valve, the 3rd valve port of cross valve and the arrival end of gas-liquid separator.
Preferably, described defrost pipeline comprises anti-freezing stream unit and the sub-pipeline of defrost being connected, the sub-pipeline of described defrost is installed on the chassis of described off-premises station and connects described indoor set, described anti-freezing stream unit one end is connected in described second and regulates pipeline and first to regulate between pipeline, and the other end is connected with indoor set by the sub-pipeline of defrost.
Preferably, adjusting joint stream unit and minute pressure part that described second regulates pipeline to comprise is connected, described adjusting joint stream unit is connected with the arrival end of described gas-liquid separator, and within described minute, pressure part regulates pipeline and described anti-freezing stream unit to be connected with described first.
Preferably, described anti-freezing stream unit is electric expansion valve, and described adjusting joint stream unit is capillary, and described minute pressure part is magnetic valve.
Preferably, described cold-producing medium percent of pass control capillaceous is 20%.
Preferably, described the first adjusting pipeline and the sub-pipeline of described defrost are U-shaped pipe or coiled pipe.
The present invention also provides a kind of control method of air-conditioner, and described air-conditioner is aforesaid air-conditioner, and described control method comprises:
When described air conditioner heat-production and while entering defrost pattern, control cold-producing medium described the first loop of flowing through;
When described air-conditioner freezes and enter defrost pattern, control cold-producing medium flow through described second servo loop and tertiary circuit.
Preferably, the flow through step in described the first loop of described control cold-producing medium comprises:
By closing described second, regulate the dividing potential drop component controls cold-producing medium of pipeline described the first loop of flowing through.
Preferably, the flow through step of described second servo loop and tertiary circuit of described control cold-producing medium comprises:
By opening described second, regulate the dividing potential drop component controls cold-producing medium of pipeline flow through described second servo loop and tertiary circuit.
A kind of air-conditioner and control method thereof that the present invention proposes, by the first adjusting pipeline is installed below the heat exchanger of indoor set, second regulates pipeline and defrost pipeline, first regulates pipeline, second regulates pipeline to be connected between the arrival end and off-premises station of gas-liquid separator, one end of defrost pipeline is connected in the second adjusting pipeline and first and regulates between pipeline, the other end is connected in indoor set, while carrying out antifreeze or defrost under heating mode, defrost pipeline is cushioning effect cold-producing medium becomes liquid process from gaseous state, thereby improve the degree of supercooling of air-conditioner, because the sub-pipeline of defrost of defrost pipeline is installed on chassis, be conducive to utilize waste heat to carry out antifreeze or defrost to the fin of outdoor unit heat exchanger and chassis under heating mode, the defrost time can shorten 25%, defrost is more thorough, improve user's comfort level, in the time of under refrigeration mode, first regulates pipeline cushioning effect cold-producing medium becomes liquid process from gaseous state, thereby improves the degree of supercooling of air-conditioner, improves the stability of air-conditioner operation when variable working condition.
Accompanying drawing explanation
Fig. 1 is the structural representation of the air-conditioner of prior art;
Fig. 2 is the structural representation of air-conditioner preferred embodiment of the present invention;
Fig. 3 first regulates pipeline and the sub-pipeline of defrost to be arranged on the structural representation in off-premises station in air-conditioner shown in Fig. 2;
Fig. 4 is the refrigerant circulation schematic diagram of air-conditioner shown in Fig. 2 under refrigeration mode;
Fig. 5 is the structural representation of the first adjusting pipeline shown in Fig. 4 and the sub-pipeline of defrost.
In order to make the technical scheme of invention clearer, to understand, below in conjunction with accompanying drawing, be described in further detail.
The specific embodiment
Particularly, please refer to shown in Fig. 2 and Fig. 3, one embodiment of the invention proposes a kind of air-conditioner, comprises the off-premises station 1, indoor set 2, cross valve 3, compressor 6 and the gas-liquid separator 7 that by tube connector, connect.The blast pipe 61 of compressor 6 is connected with the first valve port 31 of cross valve 3, and the muffler 62 of compressor 6 is connected with the port of export of gas-liquid separator 7, and air-conditioner also comprises the first loop, second servo loop and tertiary circuit.Wherein, the first loop comprises that the second valve port 32, indoor set 2, the defrost pipeline 9, first of the cross valve 3 connecting successively regulate pipeline 8, off-premises station 1, the 3rd valve port 33 of cross valve 3, the 4th valve port 34 of cross valve 3 and the arrival end of gas-liquid separator 7, as shown in Figure 3, defrost pipeline 9 is installed on the chassis 12 of off-premises station 1; Second servo loop comprises that the 3rd valve port 33, the off-premises station 1, first of the cross valve 3 connecting successively regulate pipeline 8, second to regulate the arrival end of pipeline 10 and gas-liquid separator 7, and as shown in Figure 3, first regulates pipeline 8 to be installed on the lower end of the heat exchanger 11 of off-premises station 1; And tertiary circuit comprises that the 3rd valve port 33 of the cross valve 3 connecting successively, off-premises station 1, first regulate pipeline 8, defrost pipeline 9, indoor set 2, the second valve port 32 of cross valve 3, the 3rd valve port 33 of cross valve 3 and the arrival end of gas-liquid separator 7.
Because air-conditioner is when cold district is used, outdoor environment temperature is lower easily to be made the associated components frosting in off-premises station 1 or freezes.When air-conditioner carries out antifreeze or defrost under heating mode, arrow in Fig. 2 represents the flow direction of cold-producing medium, compressor 6 will become the gas refrigerant of HTHP after the refrigerant compression of the gas-liquid mixed of low-temp low-pressure, the gas refrigerant of HTHP enters after indoor set 2 by the second valve port 32 of cross valve 3, the cold-producing medium that is cooled to temperature in high pressure, now in high pressure, warm cold-producing medium is got back to gas-liquid separator 7 through the 3rd valve port 33 and the 4th valve port 34 of cross valve 3 after entering off-premises station 1 through defrost pipeline 9, by the first adjusting pipeline 8 again.In high pressure, the refrigerant temperature of temperature is also higher, and outdoor temperature is lower, and chassis 12 is near the lower end of the heat exchanger 11 of off-premises station 1, therefore, can utilize fin and the chassis 12 of cold-producing medium heat exchanger 11 bottoms of temperature in the high pressure in defrost pipeline 9 to carry out antifreeze or defrost, therefore the fin of chassis 12 and heat exchanger 11 will be not can dew can frosting or freeze yet, condensed water is discharged smoothly, guarantee the performance of air-conditioner.Refrigerant temperature after defrost pipeline 9 further reduces.Defrost pipeline 9 is cushioning effect cold-producing medium becomes liquid process from gaseous state, thereby improves the degree of supercooling of air conditioner refrigerant, is conducive to carry out antifreeze or defrost under heating mode, and the defrost time can shorten, defrost is more thorough, improves user's comfort level.
Incorporated by reference to reference to Fig. 4, when air-conditioner is under refrigeration mode, arrow in Fig. 4 represents the flow direction of cold-producing medium, compressor 6 will become the gas refrigerant of HTHP after the refrigerant compression of the gas-liquid mixed of low-temp low-pressure out from indoor set 2, the gas refrigerant of HTHP enters off-premises station 1 through the 3rd valve port 33 of cross valve 3 is laggard, the cold-producing medium of warm gas-liquid mixed be cooled to high pressure in off-premises station 1 in, in high pressure, the cold-producing medium of warm gas-liquid mixed enters after the first adjusting pipeline 8, and part cold-producing medium is got back to gas-liquid separator 7 by entering the second adjusting pipeline 10.Because the refrigerant temperature of warm gas-liquid mixed in high pressure is also higher, and outdoor temperature is lower, and first regulate pipeline 8 to be arranged on the below of the heat exchanger 11 of off-premises station 1, therefore, refrigerant temperature after the first adjusting pipeline 8 further reduces, and becomes the liquid refrigerant of temperature in high pressure.First regulates pipeline 8 cushioning effect cold-producing medium becomes liquid process from gaseous state, thereby improves the degree of supercooling of air conditioner refrigerant, improves the stability of air-conditioner, improves user's comfort level.
Wherein, when air-conditioner is under refrigeration mode, the cold-producing medium major part after the first adjusting pipeline 8 enters defrost pipeline 9, and gets back to gas-liquid separator 7 after the second valve port 32 of indoor set 2 and cross valve 3 and the 4th valve port 34.
Wherein, second regulate 10 of pipelines to open under refrigeration mode.Second regulates pipeline 10 one end to be connected with the arrival end of gas-liquid separator 7, and the other end regulates pipeline 8 to be connected with off-premises station 1 by first.In the present embodiment first regulates pipeline 8 to be installed on the lower end of the heat exchanger 11 of off-premises station 1, cold-producing medium small part after the first adjusting pipeline 8 flows to the second adjusting pipeline 10, cold-producing medium is now not all liquefaction also, still there is higher pressure, therefore second regulate 10 pairs of cold-producing mediums of pipeline to carry out dividing potential drop to reduce pressure, and further carry out throttling, make almost all liquefaction of cold-producing medium, get back in gas-liquid separator 7, first regulates pipeline 8 to coordinate second to regulate the dividing potential drop of pipeline 10 and the degree of supercooling that throttling action can further improve air conditioner refrigerant.
Incorporated by reference to reference to Fig. 3 and Fig. 4, in a preferred embodiment, defrost pipeline 9 comprises anti-freezing stream unit 92 and the sub-pipeline 91 of defrost being connected, as shown in Figure 4, first regulates pipeline 8 to be installed on the lower end of the heat exchanger 11 of off-premises station 1, and the sub-pipeline 91 of defrost is installed on the chassis 12 of off-premises station 1.Anti-freezing stream unit 92 one end are connected in the second adjusting pipeline 10 and first and regulate between pipeline 8, and the other end is connected with indoor set 2 by the sub-pipeline 91 of defrost.
Preferably, adjusting joint stream unit 101 and minute pressure part 102 that second regulates pipeline 10 to comprise is connected, adjusting joint stream unit 101 is connected with the arrival end of gas-liquid separator 7, and a minute pressure part 102 is connected with the first adjusting pipeline 8 and described anti-freezing stream unit 92 respectively.
The sub-pipeline 91 of defrost in the present embodiment is installed on the chassis 12 of off-premises station 1, antifreeze or defrost is carried out on end portion and the chassis 12 of main heat exchanger 11, because the second adjusting pipeline 10 is closed condition under heating mode, refrigerant flow direction anti-freezing stream unit 92 after the sub-pipeline 91 of defrost, after 92 throttlings of anti-freezing stream unit, cold-producing medium is further lowered the temperature, successively through the first adjusting pipeline 8, after the 3rd valve port 33 of off-premises station 1 and cross valve 3 and the 4th valve port 34, get back in gas-liquid separator 7, the sub-pipeline 91 of defrost can improve the degree of supercooling of air conditioner refrigerant equally.
Preferably, above-mentioned anti-freezing stream unit 92 is electric expansion valve, and adjusting joint stream unit 101 is capillary, and a minute pressure part 102 is magnetic valve.Wherein, magnetic valve and operation principle capillaceous are: when air-conditioner enters defrost pattern under refrigeration mode, magnetic valve powers on and opens, and part cold-producing medium, through magnetic valve and capillary, then enters gas-liquid separator 7, finally enters compressor 6.When defrost finishes, magnetic valve power-off, stops cold-producing medium through magnetic valve and capillary; Specification length capillaceous need be known the real situation to debug through experiment and be gone to determine, to guarantee the accurate shunting of cold-producing medium.Wherein, cold-producing medium percent of pass capillaceous is controlled at 20% for best.
Preferably, as shown in Figure 5, first regulates pipeline 8 and the sub-pipeline 91 of defrost to consist of U-shaped pipe, or also can consist of coiled pipe etc.
The present invention also proposes a kind of control method of air-conditioner, and this air-conditioner is above-mentioned air-conditioner, comprises the first loop, second servo loop and tertiary circuit, and described control method comprises:
When air conditioner heat-production and while entering defrost pattern, control cold-producing medium first loop of flowing through;
When air-conditioner freezes and enter defrost pattern, control cold-producing medium flow through second servo loop and tertiary circuit.
Wherein, above-mentioned two steps in no particular order, so long as air conditioner heat-production while entering defrost pattern, are controlled cold-producing medium first loop of flowing through; And air-conditioner freezes and while entering defrost pattern, control cold-producing medium flow through second servo loop and tertiary circuit.
Wherein, controlling the flow through step in the first loop of cold-producing medium comprises: by closing the dividing potential drop component controls cold-producing medium of the second adjusting pipeline first loop of flowing through.Controlling the flow through step of second servo loop and tertiary circuit of cold-producing medium comprises: by opening the dividing potential drop component controls cold-producing medium of the second adjusting pipeline flow through second servo loop and tertiary circuit.In the present embodiment, a minute pressure part can be magnetic valve, after power-off, can close, and after powering on, can open.
Compared with prior art, air-conditioner of the present invention and control method thereof, by the first adjusting pipeline is installed below the heat exchanger of indoor set, second regulates pipeline and defrost pipeline, first regulates pipeline, second regulates pipeline to be connected between the arrival end and off-premises station of gas-liquid separator, one end of defrost pipeline is connected in the second adjusting pipeline and first and regulates between pipeline, the other end is connected in indoor set, while carrying out antifreeze or defrost under heating mode, defrost pipeline is cushioning effect cold-producing medium becomes liquid process from gaseous state, thereby improve the degree of supercooling of air-conditioner, because the sub-pipeline of defrost of defrost pipeline is installed on chassis, be conducive to utilize waste heat to carry out antifreeze or defrost to the fin of outdoor unit heat exchanger and chassis under heating mode, the defrost time can shorten 25%, defrost is more thorough, improve user's comfort level, in the time of under refrigeration mode, first regulates pipeline cushioning effect cold-producing medium becomes liquid process from gaseous state, thereby improves the degree of supercooling of air-conditioner, improves the stability of air-conditioner operation when variable working condition.
The foregoing is only the preferred embodiments of the present invention; not thereby limit every equivalent structure or the flow process conversion that utilizes description of the present invention and accompanying drawing content to do of the scope of the claims of the present invention; or directly or connect and be used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (9)
1. an air-conditioner, comprise the off-premises station, indoor set, cross valve, compressor and the gas-liquid separator that by tube connector, are connected, the blast pipe of described compressor is connected with the first valve port of described cross valve, the muffler of described compressor is connected with the port of export of described gas-liquid separator, it is characterized in that, also comprise the first loop, second servo loop and tertiary circuit;
Described the first loop comprises that the second valve port, indoor set, the defrost pipeline, first of the described cross valve connecting successively regulate pipeline, off-premises station, the 3rd valve port of cross valve, the 4th valve port of cross valve and the arrival end of gas-liquid separator, and described defrost pipeline is installed on the chassis of described off-premises station; Described second servo loop comprises that the 3rd valve port, the off-premises station, first of the described cross valve connecting successively regulate pipeline, second to regulate the arrival end of pipeline and gas-liquid separator, and described first regulates pipeline to be installed on the lower end of the heat exchanger of described off-premises station; And described tertiary circuit comprises that the 3rd valve port of the described cross valve connecting successively, off-premises station, first regulate pipeline, defrost pipeline, indoor set, the second valve port of cross valve, the 3rd valve port of cross valve and the arrival end of gas-liquid separator.
2. air-conditioner according to claim 1, it is characterized in that, described defrost pipeline comprises anti-freezing stream unit and the sub-pipeline of defrost being connected, the sub-pipeline of described defrost is installed on the chassis of described off-premises station and connects described indoor set, described anti-freezing stream unit one end is connected in described second and regulates pipeline and first to regulate between pipeline, and the other end is connected with indoor set by the sub-pipeline of defrost.
3. air-conditioner according to claim 2, it is characterized in that, adjusting joint stream unit and minute pressure part that described second regulates pipeline to comprise is connected, described adjusting joint stream unit is connected with the arrival end of described gas-liquid separator, and within described minute, pressure part regulates pipeline and described anti-freezing stream unit to be connected with described first.
4. air-conditioner according to claim 3, is characterized in that, described anti-freezing stream unit is electric expansion valve, and described adjusting joint stream unit is capillary, and described minute pressure part is magnetic valve.
5. air-conditioner according to claim 4, is characterized in that, it is 20% that described cold-producing medium percent of pass capillaceous is controlled.
6. air-conditioner according to claim 2, is characterized in that, described the first adjusting pipeline and the sub-pipeline of described defrost are U-shaped pipe or coiled pipe.
7. a control method for air-conditioner, is characterized in that, described air-conditioner is aforementioned air-conditioner claimed in claim 1, and described control method comprises:
When described air conditioner heat-production and while entering defrost pattern, control cold-producing medium described the first loop of flowing through;
When described air-conditioner freezes and enter defrost pattern, control cold-producing medium flow through described second servo loop and tertiary circuit.
8. control method according to claim 7, is characterized in that, the flow through step in described the first loop of described control cold-producing medium comprises:
By closing described second, regulate the dividing potential drop component controls cold-producing medium of pipeline described the first loop of flowing through.
9. control method according to claim 7, is characterized in that, the flow through step of described second servo loop and tertiary circuit of described control cold-producing medium comprises:
By opening described second, regulate the dividing potential drop component controls cold-producing medium of pipeline flow through described second servo loop and tertiary circuit.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105202724A (en) * | 2015-10-21 | 2015-12-30 | Tcl空调器(中山)有限公司 | Air conditioner control method, air conditioner control device and air conditioner |
| CN106766384A (en) * | 2017-03-31 | 2017-05-31 | 中国环境科学研究院 | A kind of low-temperature air source heat pump devices and methods therefor of achievable steam conversion |
| CN107101275A (en) * | 2017-06-01 | 2017-08-29 | 青岛海尔空调器有限总公司 | A kind of air conditioner and its control method |
| CN110006154A (en) * | 2019-05-05 | 2019-07-12 | 珠海格力电器股份有限公司 | Thawing apparatus, air-conditioner outdoor unit and change ice control method |
| CN110567099A (en) * | 2019-09-23 | 2019-12-13 | 宁波奥克斯电气股份有限公司 | Method and device for preventing outdoor unit of multi-connected air conditioner from freezing and air conditioner |
| CN110926051A (en) * | 2019-11-21 | 2020-03-27 | 广东美的暖通设备有限公司 | Outdoor heat exchanger assembly, air conditioning system and defrosting method thereof |
| CN111197819A (en) * | 2018-11-16 | 2020-05-26 | 奥克斯空调股份有限公司 | Air conditioner outdoor unit, air conditioner and control method of air conditioner |
| CN111947242A (en) * | 2020-08-24 | 2020-11-17 | 珠海格力电器股份有限公司 | Outdoor unit, air conditioning system and control method of outdoor unit |
| CN112856718A (en) * | 2019-11-28 | 2021-05-28 | 广东美的制冷设备有限公司 | Air conditioner, control method thereof and storage medium |
| CN111947242B (en) * | 2020-08-24 | 2024-05-03 | 珠海格力电器股份有限公司 | Control method of outdoor unit and air conditioning system |
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