CN113465127A - Anti-frosting control method of air conditioner and air conditioner - Google Patents
Anti-frosting control method of air conditioner and air conditioner Download PDFInfo
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- CN113465127A CN113465127A CN202110693797.8A CN202110693797A CN113465127A CN 113465127 A CN113465127 A CN 113465127A CN 202110693797 A CN202110693797 A CN 202110693797A CN 113465127 A CN113465127 A CN 113465127A
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000002347 injection Methods 0.000 claims abstract description 81
- 239000007924 injection Substances 0.000 claims abstract description 81
- 230000002265 prevention Effects 0.000 claims abstract description 11
- 238000010257 thawing Methods 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 abstract description 30
- 239000003507 refrigerant Substances 0.000 description 36
- 239000007788 liquid Substances 0.000 description 31
- 238000005057 refrigeration Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 14
- 239000003921 oil Substances 0.000 description 9
- 238000001816 cooling Methods 0.000 description 8
- 239000000243 solution Substances 0.000 description 5
- 238000004378 air conditioning Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention relates to an anti-frosting control method of an air conditioner and the air conditioner using the control method. The air conditioner is provided with a bypass circuit between a discharge port and a suction port of a compressor, a portion of the bypass circuit is coupled to a bottom of an outdoor heat exchanger, and the bypass circuit has an injection valve between the discharge port and the bottom, and a control method includes: detecting the outdoor environment temperature; comparing the outdoor ambient temperature with a first preset temperature; when the outdoor environment temperature is lower than a first preset temperature, starting to judge whether the air conditioner needs to enter a frost prevention mode; detecting the temperature of a coil of the outdoor heat exchanger, and acquiring the disconnection duration of the injection valve; and when the temperature of the coil pipe is less than a first difference value between the outdoor environment temperature and the first temperature correction value and lasts for a first preset time period, and the disconnection duration of the injection valve is more than or equal to a second preset time period, the air conditioner enters the anti-frosting mode and controls the injection valve to be closed. The air conditioner can effectively prevent frosting during low-temperature heating.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to an anti-frosting control method of an air conditioner and the air conditioner.
Background
Air conditioners, including split type air conditioners, integrated air conditioners, or vrf (variable refresher volume) air conditioning systems, generally include a compressor for compressing a Refrigerant, an expansion device for expanding and depressurizing the Refrigerant, an outdoor heat exchanger (generally in the form of a "coil") for exchanging heat with outdoor air, and an indoor heat exchanger (generally in the form of a "coil"), where the indoor coil is for exchanging heat with indoor air to lower or raise the temperature of the indoor air. In split air conditioning or VRF air conditioning systems, the indoor coil is typically housed in a separate indoor unit, such as a wall-mounted indoor unit, a floor-mounted cabinet unit, or an embedded indoor unit. Many air conditioners are currently configured to provide cooling, heating, or a combination thereof. In the cooling mode, the indoor coil serves as an evaporator, and a refrigerant circulating in the air conditioner evaporates in the evaporator to absorb heat from the indoor air, so that the indoor air is cooled (i.e., cooled). In the heating mode, the indoor coil functions as a condenser, and the refrigerant is condensed into liquid in the indoor coil by releasing heat to the indoor air, and the indoor air is also heated to a higher temperature (i.e., heating).
When the outdoor ambient temperature is low (e.g., below 5 ℃), the air conditioner is typically controlled to operate in a heating mode to deliver heat to the conditioned room. At this time, the outdoor coil pipe serves as an evaporator, and the liquid refrigerant needs to absorb heat and be evaporated into a gaseous refrigerant, so that the temperature of the outdoor coil pipe is low, and the phenomenon of frosting is easily caused. Especially, when the humidity in the outdoor environment is also high, the frosting speed of the outdoor heat exchanger is increased. After frosting on the outdoor heat exchanger, the frost layer can increase the thermal resistance for the heat transfer effect of outdoor heat exchanger reduces, and then reduces indoor heating effect, and the efficiency also can reduce simultaneously, and the consumption increases thereupon. In order to solve the technical problem that the air conditioner is easy to frost when running in a heating mode under the low-temperature working condition, the common method in the prior art is to switch the air conditioner into a cooling mode and utilize high-temperature steam discharged by a compressor to heat and defrost an outdoor heat exchanger. However, in this case, the air conditioner may not only suspend the supply of hot air to the room, but also supply cold air to the room, so that the indoor temperature does not rise or fall. Especially under the abominable operating mode, the air conditioner needs to switch to the refrigeration mode frequently and carries out the defrosting, and the time of defrosting is also longer in every turn, has greatly reduced user's use and has experienced.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the technical problem in the prior art that an outdoor heat exchanger is prone to frosting when an air conditioner operates in a heating mode under a low-temperature working condition, the invention provides a frosting prevention control method for an air conditioner. The air conditioner includes a compressor and an outdoor heat exchanger, a bypass circuit is provided between a discharge port and a suction port of the compressor, a portion of the bypass circuit is coupled to a bottom of the outdoor heat exchanger, and the bypass circuit has an injection valve between the discharge port and the bottom, the control method includes:
detecting the outdoor environment temperature;
comparing the outdoor ambient temperature with a first preset temperature;
when the outdoor environment temperature is lower than the first preset temperature, starting to judge whether the air conditioner needs to enter a frost prevention mode;
detecting the temperature of a coil of the outdoor heat exchanger, and acquiring the disconnection duration of the injection valve;
when the temperature of the coil pipe is smaller than a first difference value between the outdoor environment temperature and a first temperature correction value and lasts for a first preset time period, and the off-time of the injection valve is greater than or equal to a second preset time period, the air conditioner enters the anti-frosting mode and controls the injection valve to be closed,
wherein the second preset time period is greater than the first preset time period.
It can be understood by those skilled in the art that in the air conditioner using the anti-frosting control method of the air conditioner of the present invention, a compressor and an outdoor heat exchanger are included. A bypass circuit is provided between the discharge port and the suction port of the compressor, a portion of the bypass circuit is coupled to the bottom of the outdoor heat exchanger, and an injection valve is provided on the bypass circuit at the bottom of the discharge port and the outdoor heat exchanger. Through the configuration, when the outdoor heat exchanger has the risk of frosting, the injection valve can be controlled to be closed, so that part of high-temperature refrigerant flowing out of the exhaust port of the compressor can be conveyed to the bottom of the outdoor heat exchanger through the bypass loop, the outdoor heat exchanger is heated, frosting of the outdoor heat exchanger is avoided, or the frosting time is delayed, and the air conditioner is prevented from frequently entering a defrosting mode. In the anti-frosting control method of the air conditioner, firstly, the outdoor environment temperature is detected, and then the measured outdoor environment temperature is compared with the first preset temperature. When the outdoor environment temperature is lower than the first preset temperature, the outdoor environment temperature is lower at the moment, and the outdoor heat exchanger has the risk of frosting. Then, whether the air conditioner satisfies an entry condition for entering the anti-frosting mode is judged. And detecting the temperature of a coil of the outdoor heat exchanger, and simultaneously acquiring the disconnection duration of the injection valve. And when the temperature of the coil of the outdoor heat exchanger is less than a first difference value between the outdoor environment temperature and the first temperature correction value and lasts for a first preset time period, and when the disconnection duration of the injection valve is more than or equal to a second preset time period, controlling the air conditioner to enter a frost prevention mode and controlling the injection valve to be closed. It should be noted that, when the temperature of the coil of the outdoor heat exchanger is less than the first difference between the outdoor ambient temperature and the first temperature correction value and lasts for the first preset time period, it indicates that the temperature of the outdoor heat exchanger is low and the risk of frosting of the outdoor heat exchanger is high. In addition, when the open duration of the injection valve is greater than or equal to the second preset time period, it indicates that a certain time has been separated from the previous closing of the injection valve at this time, and the influence of controlling the closing of the injection valve on the overall effect of indoor heating is small. When the two conditions are met, the air conditioner is controlled to enter the frosting prevention mode, the frosting phenomenon can be effectively prevented, the energy efficiency of the compressor can be considered, and therefore the air conditioner can be kept to operate stably. More importantly, the anti-frosting control method of the air conditioner can achieve the purpose of delaying frosting time and even avoiding frosting without converting the air conditioner into a refrigeration mode, thereby obviously improving the use experience and comfort of users.
In a preferred embodiment of the above-described anti-frosting control method of the air conditioner, the control method further includes:
when the injection valve is controlled to be closed, the outdoor environment temperature and the coil temperature are detected again after a third preset time period;
comparing the current coil temperature to the outdoor ambient temperature;
controlling opening and closing of the injection valve based on the comparison result.
In a preferred embodiment of the above-mentioned frost prevention control method for an air conditioner, when the current coil temperature is less than a second difference between the outdoor ambient temperature and a second temperature correction value, the injection valve is kept closed,
wherein the second temperature correction value is less than the first temperature correction value. When the current coil temperature is still less than the second difference value, which indicates that the outdoor coil temperature is still low, the risk of frosting still exists, and therefore the injection valve is controlled to be kept closed so as to continuously heat the outdoor heat exchanger.
In a preferred embodiment of the above method for controlling frost formation of an air conditioner, when the current coil temperature is greater than or equal to the second difference, the injection valve is controlled to be turned off. When the current coil temperature is larger than or equal to the second difference value, the coil temperature of the outdoor heat exchanger is increased, the possibility of frosting is greatly reduced, and the injection valve is controlled to be switched off in order to take the energy efficiency of the compressor into consideration.
In a preferred embodiment of the above-described anti-frosting control method of the air conditioner, the control method further includes:
acquiring the closing time length of the injection valve after controlling the injection valve to be closed;
comparing the closing time period with a fourth preset time period;
and when the closing time length is less than the fourth preset time period, controlling the injection valve to be kept closed. When the closing time of the injection valve is shorter than the fourth preset time period, the closing time of the injection valve is shorter, the influence of the opening of the bypass circuit on the energy efficiency of the compressor is smaller, and the influence on the indoor heating effect is further smaller, so that the injection valve is controlled to be kept closed, and the outdoor heat exchanger is continuously heated.
In a preferable technical solution of the above-mentioned anti-frosting control method of the air conditioner, when the closing time period is greater than or equal to the fourth preset time period, the injection valve is controlled to be opened. When the closing time of the injection valve is greater than or equal to the fourth preset time period, it is indicated that the closing time of the injection valve is longer at this time, which may cause the energy efficiency of the compressor to be significantly reduced, thereby significantly reducing the indoor heating effect, and thus the injection valve is controlled to be opened.
In a preferred technical solution of the above-mentioned frost prevention control method for an air conditioner, after the coil temperature is less than a first difference between the outdoor ambient temperature and a first temperature correction value and lasts for a first preset time period, the control method further includes:
comparing the coil temperature to a third difference between the outdoor ambient temperature and a third temperature correction;
when the temperature of the coil is smaller than the third difference value, controlling the air conditioner to enter a defrosting mode, controlling a four-way valve of the air conditioner to reverse, and controlling the injection valve to be closed,
wherein the third temperature correction value is greater than the first temperature correction value. When the temperature of the coil is smaller than the third difference value between the outdoor environment temperature and the third temperature correction value, the frosting phenomenon of the outdoor heat exchanger can be generated. At the moment, the air conditioner is controlled to enter a defrosting mode, the four-way valve is controlled to change the direction, and the injection valve is controlled to be closed, so that the high-temperature steam refrigerant flowing out of the exhaust port of the compressor is rapidly conveyed to the outdoor heat exchanger to be heated and defrosted, and the defrosting effect is enhanced.
In a preferred technical solution of the above-mentioned anti-frosting control method of the air conditioner, after the air conditioner enters a defrosting mode,
re-detecting the temperature of the coil pipe, and acquiring the accumulated running time of the air conditioner entering a defrosting mode;
and when the current temperature of the coil pipe is greater than or equal to a second preset temperature or the accumulated running time is greater than or equal to a fifth preset time period, controlling the air conditioner to exit the defrosting mode, controlling the four-way valve to reverse and controlling the injection valve to be switched off. When the current coil temperature is greater than or equal to the second preset temperature, the coil temperature is increased, the frosting phenomenon on the outdoor heat exchanger is greatly relieved, and even the frost layer is completely removed, so that the air conditioner is controlled to exit the defrosting mode, the four-way valve is controlled to reverse and enter the heating mode, and the injection valve is controlled to be disconnected, so that the energy efficiency of the compressor is improved, and the indoor heating effect is enhanced. In addition, when the accumulated running time of the air conditioner entering the defrosting mode exceeds a fifth preset time period, the air conditioner runs for a long time in the refrigerating mode at the moment, the indoor temperature is possibly obviously reduced, and in order to meet the heating requirement of a user, the air conditioner is controlled to exit the defrosting mode and continue to convey heat indoors. When one of the two conditions is met, the air conditioner can be controlled to exit the defrosting mode, so that the time for exiting the defrosting mode of the air conditioner is more in line with the actual requirement.
In order to solve the above problems in the prior art, that is, to solve the technical problem in the prior art that the outdoor heat exchanger is prone to frosting when the air conditioner operates in the heating mode under the low-temperature working condition, the invention further provides the air conditioner. The air conditioner includes:
a compressor having a discharge port and a suction port;
an outdoor heat exchanger;
a bypass circuit configured to extend from the discharge port to the pressure suction port, a portion of the bypass circuit being coupled to a bottom of the outdoor heat exchanger, and the bypass circuit having an injection valve between the discharge port and the bottom, and the air conditioner controlling the air conditioner using the anti-frosting control method according to any one of the above. By using the anti-frosting control method, the air conditioner can timely control the injection valve to be closed when the heating mode is operated under the low-temperature working condition, so that part of high-temperature refrigerant flowing out of the exhaust port of the compressor can be conveyed to the bottom of the outdoor heat exchanger through the bypass loop, the outdoor heat exchanger can be heated, frosting of the outdoor heat exchanger is avoided, or the frosting time is delayed, and the air conditioner is prevented from frequently entering the defrosting mode.
In the above-described preferred embodiment of the air conditioner, the portion of the bypass circuit coupled to the bottom is in the form of a hairpin tube. The part of combining the bypass circuit of the bottom of outdoor heat exchanger adopts the form of hairpin pipe, not only can make the assembly of bypass circuit simpler, can take to combine together with a plurality of hairpin pipes of outdoor heat exchanger bottom according to actual need moreover, and then promote the effect of preventing frosting.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a system schematic of an embodiment of an air conditioner of the present invention;
FIG. 2 is a flowchart of an anti-frosting control method of the air conditioner of the present invention;
FIG. 3 is a flowchart of a first embodiment of an anti-frosting control method of an air conditioner of the present invention;
FIG. 4 is a flowchart of a second embodiment of an anti-frosting control method of an air conditioner of the present invention;
fig. 5 is a flowchart of a third embodiment of an anti-frosting control method of an air conditioner according to the present invention.
List of reference numerals:
1. an air conditioner; 11. an outdoor unit; 111. a compressor; 111a, an exhaust port; 111b, an air inlet; 111c, compressor heating belt; 112a, an exhaust pipe; 112b, liquid pipe; 112c, a gas pipe; 112d, an air suction pipe; 113. a high voltage protection switch; 114. an oil separator; 115. an oil return capillary tube; 116. a high pressure sensor; 117. a four-way valve; 118. an outdoor heat exchanger; 118a, bottom; 119. a high pressure reservoir; 119a, a high-pressure reservoir heating belt; 120. drying the filter; 121. a liquid viewing mirror; 122. a liquid pipe stop valve; 123. an air pipe stop valve; 124. a gas-liquid separator; 125. a low pressure sensor; 126. a bypass loop; 127. an injection valve; 21. an indoor unit; 211. an indoor heat exchanger; 212. an expansion valve; 213. an indoor solenoid valve.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
In order to solve the technical problem that an outdoor heat exchanger is easy to frost when an air conditioner operates in a heating mode under a low-temperature working condition in the prior art, the invention provides a frosting prevention control method of the air conditioner. The air conditioner 1 includes a compressor 111 and an outdoor heat exchanger 118, a bypass circuit 126 is provided between a discharge port 111a and a suction port 111b of the compressor 111, a part of the bypass circuit 126 is coupled to a bottom portion 118a of the outdoor heat exchanger 118, and the bypass circuit 126 has an injection valve 127 between the discharge port 111a and the bottom portion 118 a. The invention relates to an anti-frosting control method of an air conditioner, which comprises the following steps:
detecting an outdoor ambient temperature (step S1);
comparing the outdoor ambient temperature with a first preset temperature (step S2);
when the outdoor environment temperature is lower than the first preset temperature, starting to judge whether the air conditioner needs to enter a frost prevention mode (step S3);
detecting the coil temperature of the outdoor heat exchanger and acquiring the disconnection time length of the injection valve (step S4);
when the coil temperature is less than a first difference value between the outdoor environment temperature and the first temperature correction value and continues for a first preset time period, and the off-time of the injection valve is greater than or equal to a second preset time period, the air conditioner enters the anti-frosting mode and controls the injection valve to be closed, wherein the second preset time period is greater than the first preset time period (step S5).
Fig. 1 is a system diagram of an embodiment of an air conditioner of the present invention. As shown in fig. 1, in one or more embodiments, the air conditioner 1 includes an outdoor unit 11 (which is generally disposed in an outdoor environment) and one indoor unit 21 (which is generally disposed indoors or in a room). Alternatively, the air conditioner 1 may be equipped with a plurality of parallel-connected indoor units, for example two, three, four or another suitable number of indoor units. Fig. 1 shows only one indoor unit 21. In the case where a plurality of indoor units are arranged, the arrangement of the plurality of indoor units may be the same or different depending on actual needs.
As shown in fig. 1, in one or more embodiments, the outdoor unit 11 mainly includes a compressor 111, a four-way valve 117, an outdoor heat exchanger 118, a high-pressure accumulator 119, and a gas-liquid separator 124; the indoor unit 21 mainly includes an indoor heat exchanger 211, an expansion valve 212, and an indoor solenoid valve 213. The compressor 111 has an exhaust port 111a and an intake port 111 b. The exhaust port 111a of the compressor 111 is connected to a first port of the four-way valve 117 through an exhaust pipe 112 a; a second port of the four-way valve 117 is connected to an input of the outdoor heat exchanger 118; the output end of the outdoor heat exchanger 118 is connected to the high-pressure reservoir 119, the expansion valve 212 of the indoor unit 21, and the indoor heat exchanger 211 in this order through the liquid pipe 112 b; the indoor heat exchanger 211 is connected to a third port of the four-way valve 117 through a gas pipe 112 c; a fourth port of the four-way valve 117 is connected to an air inlet of the gas-liquid separator 124, and an air outlet of the gas-liquid separator 124 is connected to a suction port 111b of the compressor 111 through the suction pipe 112d, so that a refrigeration cycle allowing a refrigerant to flow therein is formed by interconnection, and the air conditioner 1 can be switched between a cooling mode and a heating mode by means of the four-way valve 117.
As shown in FIG. 1, in one or more embodiments, the compressor 111 is an inverter compressor. Alternatively, the compressor 111 may include two or more compressors in parallel. These compressors may be all inverter compressors or may include some inverter compressors. In one or more embodiments, a high pressure protection switch 113 is disposed on the discharge line 112a near the discharge port 111a of the compressor 111 to provide shutdown protection when the discharge pressure of the compressor 111 is too high. In one or more embodiments, an oil separator 114 is disposed on the gas discharge pipe 112a, wherein a gas input end of the oil separator 114 is connected to a gas discharge port 111a of the compressor 111; the gas output of the oil separator 114 is connected to a first port of a four-way valve 117 via a gas discharge pipe 112 a; the oil return discharge end of the oil separator 114 is connected to an oil return capillary tube 115 and is connected to the suction port 111b of the compressor 111 through a pipe so as to return the lubricating oil to the compressor 111 in time. In one or more embodiments, a compressor heating zone 111c is provided at the bottom of the compressor 111 to preheat the compressor 111 when needed. In one or more embodiments, a high pressure sensor 116 is also provided on the discharge pipe 112a for detecting the discharge pressure of the compressor 111, the high pressure sensor 116 being located downstream of the gas output of the oil separator 114. In one or more embodiments, a low pressure sensor 125 for detecting a suction pressure of the compressor 111 is further disposed on the suction pipe 112d, and the low pressure sensor 125 is located downstream of a gas output end of the gas-liquid separator 124.
As shown in fig. 1, in one or more embodiments, the outdoor heat exchanger 118 may be, but is not limited to, a finned coil heat exchanger or a plate heat exchanger, and is equipped with an outdoor heat exchanger fan (not shown). The high pressure accumulator 119 may receive the liquid refrigerant condensed by the outdoor heat exchanger 118 to adjust and ensure a refrigerant circulation amount in the refrigeration system. In one or more embodiments, a high pressure accumulator heating belt 119a is provided on the high pressure accumulator 119 to preheat the liquid refrigerant, ensuring accurate supply of the refrigerant. A dry filter 120, a sight glass 121, and a liquid pipe shutoff valve 122 are also connected in series in this order to the liquid pipe 112b downstream of the high-pressure accumulator 119. The desiccant filter 120 may dry moisture in the liquid refrigerant, the liquid viewing mirror 121 may be used to observe a flow condition of the liquid refrigerant and detect a water content in the refrigerant, and the liquid tube blocking valve 122 may help to temporarily store the refrigerant in the refrigeration cycle circuit outside the room, so as to facilitate assembly, disassembly, maintenance, and repair of the air conditioner 1. In one or more embodiments, an indoor solenoid valve 213 is further disposed at a position of the liquid pipe 112b upstream of the expansion valve 212 to control the liquid refrigerant to flow into the indoor unit 21.
As shown in fig. 1, in one or more embodiments, the expansion valve 212 is a thermal expansion valve. Alternatively, the expansion valve 212 may be an electronic expansion valve, or other suitable expansion valve. The indoor heat exchanger 211 includes, but is not limited to, a fin-and-coil heat exchanger or a plate heat exchanger, and is provided with an indoor heat exchanger fan (not shown in the drawings). The gas pipe 112c is further provided with a gas pipe shutoff valve 123 to assist the refrigerant in the refrigeration cycle circuit to be temporarily stored outside the room in cooperation with the liquid pipe shutoff valve 122.
As shown in FIG. 1, in one or more embodiments, a bypass circuit 126 is provided between the discharge port 111a and the suction port 111b of the compressor 111. The pipe diameter of the bypass circuit 126 is set smaller than the pipe diameter of the exhaust pipe 112a in the main circuit of the refrigeration system so as to control the flow distribution of the refrigerant between the bypass circuit 126 and the main circuit of the refrigeration system. A portion of the bypass loop 126 is coupled to the bottom portion 118a of the outdoor heat exchanger 118. In one or more embodiments, the outdoor heat exchanger 118 is in the form of a coil, and the portion of the bypass loop 126 that is coupled to the bottom portion 118a of the outdoor heat exchanger 118 is in the form of a hairpin tube. It should be noted that the hairpin tube(s) that are associated with the bottom portion 118a of the outdoor heat exchanger 118 and that form part of the bypass circuit 126 are relatively independent of the other hairpin tubes in the outdoor heat exchanger 118 and do not participate in the refrigerant delivery in the main cycle of the refrigeration system. In one or more embodiments, there are 1 hairpin tube making up a portion of the bypass loop 126. Alternatively, the number of the hairpin pipes may be configured to be 2, 3, or other suitable number according to actual needs. Further, the portion of the bypass circuit 126 coupled to the bottom 118a of the outdoor heat exchanger 118 may also be configured in the form of a coil wound in a spiral shape around the bottom 118a, or other suitable forms. Injection valve 127 is a solenoid valve, or other suitable form of control valve. The injection valve 127 is configured to be electrically connected to a control system (not shown) of the air conditioner 1, so as to automatically control the opening and closing of the injection valve 127, and thus to adjust the opening and closing of the bypass circuit 126.
The air conditioner 1 can perform a cooling and heating cycle by means of the four-way valve 117. In the refrigeration cycle, the outdoor heat exchanger 118 functions as a condenser, and the indoor heat exchanger 211 functions as an evaporator. When the air conditioner 1 receives a cooling command, the compressor 111 starts to operate, and the refrigerant (e.g., R410a) is compressed by the compressor 111 and then flows through the outdoor heat exchanger 118 (which serves as a condenser) in the form of a high-temperature and high-pressure gas through the discharge pipe 112 a. In the outdoor heat exchanger 118, the high-temperature and high-pressure gas refrigerant is condensed into a high-temperature and high-pressure liquid refrigerant by transferring heat to an air flow caused by the outdoor heat exchanger fan. The high-temperature and high-pressure liquid refrigerant flows through the high-pressure accumulator 119, the dry filter 120, the liquid scope 121, and the liquid tube shutoff valve 122 in this order, and flows to the expansion valve 212 of the indoor unit 21. The expansion valve 212 throttles the high-temperature and high-pressure liquid refrigerant to a low-temperature and low-pressure liquid refrigerant, and distributes the refrigerant to the indoor heat exchanger 211. The low-temperature and low-pressure liquid refrigerant is evaporated into a low-temperature and low-pressure gas refrigerant by absorbing heat of the indoor air, and the indoor air is cooled. The low-temperature and low-pressure gaseous refrigerant exits the indoor heat exchanger 211, passes through the corresponding gas pipe 112c and the gas pipe shutoff valve 123, passes through the four-way valve 117, and then enters the gas-liquid separator 124. The gas-liquid separated refrigerant gas is sucked into the compressor 111 through the suction port 111 b. A complete refrigeration cycle is completed and such refrigeration cycle can be performed without interruption in order to achieve the target refrigeration temperature. As shown by arrows in fig. 1, in the heating cycle, the flow direction of the refrigerant in the outdoor unit 11 and the indoor unit 21 is opposite to the flow direction in the cooling cycle, and the outdoor heat exchanger 118 functions as an evaporator and the indoor heat exchanger 211 functions as a condenser.
The air conditioner frost prevention control method according to the present invention will be described in detail below based on the air conditioner 1. It should be noted that the anti-frosting control method of the air conditioner of the present invention can also be used for other suitable refrigeration equipment.
Fig. 2 is a flowchart of an anti-frosting control method of an air conditioner according to the present invention. As shown in fig. 2, when the anti-frosting control method of the air conditioner of the present invention is started, step S1 is first performed, i.e., the outdoor ambient temperature is detected. In one or more embodiments, the outdoor ambient temperature is sensed by a temperature sensor disposed on one side of the outdoor heat exchanger 118. Next, the outdoor ambient temperature is compared with the first preset temperature (step S2). In one or more embodiments, the first predetermined temperature is 7 ℃ (celsius). Alternatively, the first preset temperature may be set to other suitable temperatures higher or lower than 7 ℃. When the outdoor ambient temperature is lower than the first preset temperature, it is started to determine whether the air conditioner 1 needs to enter the anti-frosting mode (step S3). When the outdoor ambient temperature is lower than the first preset temperature, it indicates that there is a risk of frosting the outdoor heat exchanger 118. However, at this time, the air conditioner 1 is not immediately controlled to enter the anti-frosting mode, but it is determined whether the air conditioner 1 needs to enter the anti-frosting mode. It can be understood that, when the air conditioner 1 enters the anti-frost mode, the injection valve 127 is controlled to be closed, and a part of the high-temperature refrigerant compressed by the compressor 111 flows into the bypass circuit 126, so that the energy efficiency of the compressor 111 is reduced. Therefore, by setting a more strict entry condition of the anti-frosting mode, the timing at which the air conditioner 1 enters the anti-frosting mode can be more accurate. Therefore, after the air conditioner 1 starts to determine whether the air conditioner needs to enter the anti-frosting mode, step S4 is executed, in which the coil temperature of the outdoor heat exchanger 118 is detected, and the off-duration of the injection valve 127 is obtained. In one or more embodiments, the coil temperature of the outdoor heat exchanger 118 is sensed by a temperature sensor disposed in the middle of the outdoor heat exchanger 118. When the coil temperature is less than the first difference between the outdoor ambient temperature and the first temperature correction value and continues for a first preset time period, and the off-duration of the injection valve is greater than or equal to a second preset time period, the air conditioner 1 enters the anti-frosting mode and controls the injection valve to close, wherein the second preset time period is greater than the first preset time period (step S5). It is noted that the "first difference" is the difference between the outdoor ambient temperature and the first temperature correction value. In one or more embodiments, the first temperature correction value is 3 ℃. Alternatively, the first temperature correction value may be set to other suitable temperatures higher or lower than 3 ℃. Further, the first preset time period is 10min (minutes). Alternatively, the first preset time period may be set to other suitable times longer or shorter than 10 min. Still further, the second preset time period is 15 min. Alternatively, the second preset time period may be set to be longer or shorter than 15min, or other suitable time period, as long as it can be longer than the first preset time period.
Fig. 3 is a flowchart of a first embodiment of an anti-frosting control method of an air conditioner according to the present invention. As shown in fig. 3, when the anti-frosting control method of the air conditioner of the present invention is started, step S1 is first performed, i.e., the outdoor ambient temperature is detected. Next, the measured outdoor ambient temperature is compared with a first preset temperature (step S2). When the outdoor ambient temperature is equal to or higher than the first preset temperature, which indicates that the outdoor ambient temperature is higher, the risk of frosting of the outdoor heat exchanger 118 is smaller, and therefore step S1 is repeated. When the outdoor ambient temperature is less than the first preset temperature, it is started to determine whether the air conditioner 1 needs to enter the anti-frosting mode (step S3). Then, step S41 is executed to detect the coil temperature of the outdoor heat exchanger 118. And comparing the measured coil temperature with the outdoor environment temperature, namely judging whether the coil temperature is smaller than a first difference value between the outdoor environment temperature and the first temperature correction value and continuing for a first preset time period (step S51). When the temperature of the coil is greater than or equal to the first difference value, the temperature of the coil is higher at the moment, and the possibility of frosting is lower; when the coil temperature is less than the first difference value but the duration time does not reach the first preset time period, it indicates that although the duration time of the coil temperature being lower is not enough, the possibility of frosting is not high. In both cases, step S41 is repeated to continue detecting changes in coil temperature. When the coil temperature is less than the first difference value for the first preset time, it indicates that the coil temperature is low and the duration is also long, and the outdoor heat exchanger 118 is at risk of frosting. Control proceeds to step S42 to acquire the off period of the injection valve 127. Next, the acquired off period is compared with a second preset time period (step S52). When the off-duration is less than the second preset time period, which indicates that the time interval from the previous closing of the injection valve 127 is short, if the closing of the injection valve 127 is controlled at this time, the energy efficiency of the compressor 111 may be significantly reduced, and the indoor heating effect may be significantly affected, so step S42 is repeated to continuously obtain the current off-duration of the injection valve 127. When the off-period is greater than or equal to the second preset time period, the control method proceeds to step S53, i.e., the air conditioner 1 is controlled to enter the anti-frosting mode, and the injection valve 127 is controlled to be closed.
Fig. 4 is a flowchart of a second embodiment of an anti-frosting control method of an air conditioner of the present invention. As shown in fig. 4, the control method proceeds to step S5, i.e., controls injection valve 127 to close. Then, the control method performs steps S61 and S62, and re-detects the outdoor ambient temperature and the coil temperature after a third preset time period. In one or more embodiments, the third preset time period is 2 min. Alternatively, the third preset time period may also be set to other suitable times longer or shorter than 2 min. Next, the measured current coil temperature and the current outdoor ambient temperature are compared to a second difference value of a second temperature correction value (step S63). It is noted that the "second difference" is the difference between the current outdoor ambient temperature and the second temperature correction value. Wherein the second temperature correction value is less than the first temperature correction value. In one or more embodiments, the second temperature correction value is 1 ℃. Alternatively, the second temperature correction value may also be set to another suitable temperature higher or lower than 1 ℃. When the current coil temperature is less than the second difference value, which indicates that the coil temperature is still low and the possibility of frosting of the outdoor heat exchanger 118 is still high, step S64 is executed to control the injection valve 127 to remain closed. Then, the steps S61 and S62 are repeatedly performed, and after a third preset time period, the outdoor ambient temperature and the coil temperature are continuously detected. When the current coil temperature is equal to or greater than the second difference value, which indicates that the coil temperature has increased and the possibility of frosting of the outdoor heat exchanger 118 has been greatly reduced, step S65 is performed to control the injection valve 127 to be opened in order to take the energy efficiency of the compressor 111 into consideration. After execution of step S65, the control method ends.
As shown in fig. 4, when the control method proceeds to step S5, the control method further performs step S66 of acquiring a closing period of the injection valve 127. Next, the obtained closing period is compared with a fourth preset time period (step S67). In one or more embodiments, the fourth preset time period is 20 min. Alternatively, the fourth preset time period may be set to other suitable times longer or shorter than 20 min. When the closing time period is shorter than the fourth preset time period, it means that the closing time of the injection valve 127 is still shorter, the effect of the opening of the bypass circuit 126 on the energy efficiency of the compressor 111 is smaller, and the effect on the indoor heating effect is smaller, so that the injection valve 127 is controlled to be kept closed (step S68) so as to continuously heat the outdoor heat exchanger 118. When the closing time period is equal to or longer than the fourth preset time period, it means that the closing time period of the injection valve 127 is long, which may significantly reduce the energy efficiency of the compressor 111, thereby significantly reducing the indoor heating effect, and thus the injection valve is controlled to be opened (step S65). After execution of step S65, the control method ends.
Fig. 5 is a flowchart of a third embodiment of an anti-frosting control method of an air conditioner according to the present invention. As shown in fig. 5, in one or more embodiments, when the control method proceeds to step S51, i.e., determines whether the coil temperature is less than the first difference value for the first preset time period, if the determination result is yes, step S70 is executed, i.e., the coil temperature is continuously compared with the third difference value between the outdoor ambient temperature and the third temperature correction value. Note that the "third difference" is a difference between the outdoor ambient temperature and the third temperature correction value. Wherein the third temperature correction value is greater than the first temperature correction value. In one or more embodiments, the third temperature correction value is 10 ℃. Alternatively, the third temperature correction value may be set to another suitable temperature higher or lower than 10 ℃, as long as it can be larger than the first temperature correction value. When the coil temperature is less than the third difference, this indicates that frosting of the outdoor heat exchanger 118 may have occurred at this time. Therefore, step S71 is executed to control the air conditioner 1 to enter the defrosting mode, control the four-way valve 117 to switch direction, and control the injection valve 127 to close, so as to rapidly deliver the high-temperature vapor refrigerant flowing out of the discharge port 111a of the compressor 111 to the bottom of the outdoor heat exchanger 118 to heat and defrost the outdoor heat exchanger 118.
As shown in fig. 5, when the air conditioner 1 enters the defrosting mode, step S72 is executed, i.e. the coil temperature is re-detected, and the accumulated running time of the air conditioner entering the defrosting mode is obtained. Control then proceeds to step S73 where the re-measured coil temperature is compared to a second preset temperature. In one or more embodiments, the second predetermined temperature is 9 ℃. Alternatively, the second preset temperature may be set to other suitable temperatures higher or lower than 9 ℃. When the current coil temperature is lower than the second preset temperature, the step S72 is repeatedly executed; when the current coil temperature is greater than or equal to the second preset temperature, it is indicated that the coil temperature has risen, the frosting phenomenon on the outdoor heat exchanger 118 has been greatly alleviated, and even the frost layer has been completely removed, step S75 is executed, the air conditioner 1 is controlled to exit the defrosting mode, the four-way valve 117 is controlled to reverse direction to enter the heating mode, and the injection valve 127 is controlled to be turned off, so as to improve the energy efficiency of the compressor 111 and enhance the indoor heating effect. In addition, at the time of performing the step S73, the control method simultaneously performs a step S74 of comparing the accumulated operation time period during which the air conditioner 1 enters the defrost mode with a fifth preset time period. In one or more embodiments, the fifth preset time period is 10 min. Alternatively, the fifth preset time period may be set to other suitable times longer or shorter than 10 min. When the accumulated operation time period for the air conditioner 1 to enter the defrosting mode is less than the fifth preset time period, the step S72 is repeatedly executed; when the accumulated operation time of the air conditioner 1 entering the defrosting mode is greater than or equal to the fifth preset time period, at this time, the air conditioner 1 has been operated in the cooling mode for a long time, the indoor temperature may have been significantly reduced, and in order to meet the heating requirement and improve the user experience, step S75 is executed. It can be understood that when the exit conditions of the two defrosting modes, namely the coil temperature and the accumulated running time, satisfy one of the conditions, that is, the air conditioner 1 is controlled to exit the defrosting mode, the time when the air conditioner 1 exits the defrosting mode can be more suitable for the actual needs.
As shown in fig. 5, after step S70 is executed, if the determination result is no, that is, when the coil temperature is equal to or greater than the third difference value, step S42 is executed, that is, the off period of time of the injection valve 117 is acquired. The remaining steps in the third embodiment that are not described in the following embodiments may be the same as those in the first and second embodiments, and are not described again here.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the invention, a person skilled in the art may combine technical features from different embodiments, and may make equivalent changes or substitutions for related technical features, and such changes or substitutions will fall within the scope of the invention.
Claims (10)
1. An anti-frosting control method of an air conditioner, wherein the air conditioner includes a compressor and an outdoor heat exchanger, a bypass circuit is provided between a discharge port and a suction port of the compressor, a portion of the bypass circuit is coupled to a bottom of the outdoor heat exchanger, and the bypass circuit has an injection valve between the discharge port and the bottom, the control method comprising:
detecting the outdoor environment temperature;
comparing the outdoor ambient temperature with a first preset temperature;
when the outdoor environment temperature is lower than the first preset temperature, starting to judge whether the air conditioner needs to enter a frost prevention mode;
detecting the temperature of a coil of the outdoor heat exchanger, and acquiring the disconnection duration of the injection valve;
when the temperature of the coil pipe is smaller than a first difference value between the outdoor environment temperature and a first temperature correction value and lasts for a first preset time period, and the off-time of the injection valve is greater than or equal to a second preset time period, the air conditioner enters the anti-frosting mode and controls the injection valve to be closed,
wherein the second preset time period is greater than the first preset time period.
2. The anti-frosting control method of an air conditioner according to claim 1, wherein the control method further comprises:
when the injection valve is controlled to be closed, the outdoor environment temperature and the coil temperature are detected again after a third preset time period;
comparing the current coil temperature to the outdoor ambient temperature;
controlling opening and closing of the injection valve based on the comparison result.
3. The anti-frosting control method of an air conditioner according to claim 2,
maintaining the injection valve closed when the current coil temperature is less than a second difference between the outdoor ambient temperature and a second temperature correction value,
wherein the second temperature correction value is less than the first temperature correction value.
4. The anti-frosting control method of an air conditioner according to claim 2,
and when the current coil temperature is greater than or equal to the second difference value, controlling the injection valve to be disconnected.
5. The anti-frosting control method of an air conditioner according to claim 1, wherein the control method further comprises:
acquiring the closing time length of the injection valve after controlling the injection valve to be closed;
comparing the closing time period with a fourth preset time period;
and when the closing time length is less than the fourth preset time period, controlling the injection valve to be kept closed.
6. The anti-frosting control method of an air conditioner according to claim 5, wherein when the closing period is greater than or equal to the fourth preset time period, the injection valve is controlled to be opened.
7. The anti-frosting control method of an air conditioner according to claim 1, wherein after the coil temperature is less than a first difference between the outdoor ambient temperature and a first temperature correction value for a first preset time period, the control method further comprises:
comparing the coil temperature to a third difference between the outdoor ambient temperature and a third temperature correction;
when the temperature of the coil is smaller than the third difference value, controlling the air conditioner to enter a defrosting mode, controlling a four-way valve of the air conditioner to reverse, and controlling the injection valve to be closed,
wherein the third temperature correction value is greater than the first temperature correction value.
8. The anti-frosting control method of an air conditioner according to claim 7, wherein, after the air conditioner enters a defrosting mode,
re-detecting the temperature of the coil pipe, and acquiring the accumulated running time of the air conditioner entering a defrosting mode;
when the current temperature of the coil pipe is greater than or equal to a second preset temperature or when the accumulated running time is greater than or equal to a fifth preset time period, controlling the air conditioner to exit a defrosting mode, controlling the four-way valve to reverse and controlling the injection valve to be switched off.
9. An air conditioner, characterized in that the air conditioner comprises:
a compressor having a discharge port and a suction port;
an outdoor heat exchanger;
a bypass circuit configured to extend from the discharge port to the suction port, a portion of the bypass circuit being coupled to a bottom of the outdoor heat exchanger, and the bypass circuit having an injection valve between the discharge port and the bottom, and
the air conditioner controls the air conditioner using the anti-frosting control method according to any one of claims 1 to 8.
10. The air conditioner of claim 9, wherein the portion of the bypass circuit coupled to the bottom is in the form of a hairpin tube.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110693797.8A CN113465127A (en) | 2021-06-22 | 2021-06-22 | Anti-frosting control method of air conditioner and air conditioner |
| PCT/CN2022/097576 WO2022267886A1 (en) | 2021-06-22 | 2022-06-08 | Anti-frost control method for air conditioner and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110693797.8A CN113465127A (en) | 2021-06-22 | 2021-06-22 | Anti-frosting control method of air conditioner and air conditioner |
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| CN113465127A true CN113465127A (en) | 2021-10-01 |
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| CN202110693797.8A Pending CN113465127A (en) | 2021-06-22 | 2021-06-22 | Anti-frosting control method of air conditioner and air conditioner |
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| CN (1) | CN113465127A (en) |
| WO (1) | WO2022267886A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060909A (en) * | 2021-10-28 | 2022-02-18 | 青岛海尔空调器有限总公司 | Air conditioner and control method thereof |
| WO2022267886A1 (en) * | 2021-06-22 | 2022-12-29 | 青岛海尔空调电子有限公司 | Anti-frost control method for air conditioner and air conditioner |
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| JPS61122441A (en) * | 1984-11-20 | 1986-06-10 | Matsushita Electric Ind Co Ltd | Controller device for operation of air conditioner |
| CN110160291A (en) * | 2018-02-06 | 2019-08-23 | 中山深宝电器制造有限公司 | A kind of low temperature heating machine defrosting control program |
| CN110749072A (en) * | 2018-07-23 | 2020-02-04 | 青岛海尔空调电子有限公司 | Air conditioner and outdoor unit defrosting control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH02275261A (en) * | 1989-04-14 | 1990-11-09 | Mitsubishi Electric Corp | Freezing cycle |
| CN203908148U (en) * | 2014-06-13 | 2014-10-29 | 广东美的制冷设备有限公司 | Air conditioning system |
| CN106016809B (en) * | 2016-05-31 | 2018-10-02 | 广东美的制冷设备有限公司 | Air-conditioning system and its defrosting control method |
| CN113465127A (en) * | 2021-06-22 | 2021-10-01 | 青岛海尔空调电子有限公司 | Anti-frosting control method of air conditioner and air conditioner |
-
2021
- 2021-06-22 CN CN202110693797.8A patent/CN113465127A/en active Pending
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2022
- 2022-06-08 WO PCT/CN2022/097576 patent/WO2022267886A1/en unknown
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61122441A (en) * | 1984-11-20 | 1986-06-10 | Matsushita Electric Ind Co Ltd | Controller device for operation of air conditioner |
| CN110160291A (en) * | 2018-02-06 | 2019-08-23 | 中山深宝电器制造有限公司 | A kind of low temperature heating machine defrosting control program |
| CN110749072A (en) * | 2018-07-23 | 2020-02-04 | 青岛海尔空调电子有限公司 | Air conditioner and outdoor unit defrosting control method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022267886A1 (en) * | 2021-06-22 | 2022-12-29 | 青岛海尔空调电子有限公司 | Anti-frost control method for air conditioner and air conditioner |
| CN114060909A (en) * | 2021-10-28 | 2022-02-18 | 青岛海尔空调器有限总公司 | Air conditioner and control method thereof |
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| Publication number | Publication date |
|---|---|
| WO2022267886A1 (en) | 2022-12-29 |
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