CN106322679B - Control method for outdoor fan of air conditioner - Google Patents

Control method for outdoor fan of air conditioner Download PDF

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Publication number
CN106322679B
CN106322679B CN201610799169.7A CN201610799169A CN106322679B CN 106322679 B CN106322679 B CN 106322679B CN 201610799169 A CN201610799169 A CN 201610799169A CN 106322679 B CN106322679 B CN 106322679B
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China
Prior art keywords
outdoor
heat exchanger
outdoor fan
temperature
environment temperature
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CN201610799169.7A
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Chinese (zh)
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CN106322679A (en
Inventor
谢李高
林竹
王勇
李金波
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
Guangdong Midea Refrigeration Equipment Co Ltd
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Priority to CN201610799169.7A priority Critical patent/CN106322679B/en
Publication of CN106322679A publication Critical patent/CN106322679A/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/38Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14Heat exchangers specially adapted for separate outdoor units

Abstract

The invention discloses a control method of an outdoor fan of an air conditioner, which comprises the following steps: the air conditioner performs refrigeration operation, and detects the outdoor environment temperature T4; when the outdoor environment temperature T4 is greater than the preset environment temperature i, controlling the outdoor fan to keep the current forward rotation state; when the outdoor environment temperature T4 is less than the preset environment temperature i, detecting the rotating speed of the outdoor fan and a detection object, wherein the detection object is at least one of the running frequency F of the compressor, the temperature T3 of the outdoor heat exchanger and the pressure PL in the indoor heat exchanger; when the rotating speed of the outdoor fan is a preset rotating speed and the detection result of the detection object meets a preset condition, controlling the outdoor fan to reversely rotate; and when the rotating speed of the outdoor fan is higher than the preset rotating speed or the detection result of the detection object does not meet the preset condition, controlling the outdoor fan to keep the current forward rotation state. According to the control method, the air quantity of the outdoor unit is reduced, the side pressure of the condensing unit is increased, and the air conditioner can continuously output cold quantity.

Description

Control method for outdoor fan of air conditioner
Technical Field
The invention relates to the field of refrigeration, in particular to a control method of an outdoor fan of an air conditioner.
Background
With the improvement of the design level of modern buildings, the heat preservation performance of the buildings is better and better, and special places such as meeting rooms, internet cafes, kitchens, machine rooms and heating areas using fireplaces have higher indoor temperature and humidity due to equipment heating and intensive people flow, and even when the outdoor temperature is below zero, the air conditioner is still necessary to be used for cooling. When the outdoor temperature is low, the pressure on the high-pressure side is low, the compression ratio of the compressor is low, the liquid supply amount of a refrigeration system is insufficient, oil return is difficult, and finally the compressor is damaged due to liquid impact.
The existing methods for improving the low-temperature refrigerating capacity and reliability mainly comprise two methods, namely, firstly, the flow of a refrigerating system is improved by increasing the high-pressure side pressure by reducing the rotating speed of an outdoor unit, so that the refrigerating performance is improved, secondly, the high-pressure side pressure is improved by guiding the return air part of the outdoor unit back to a reheating condenser through an additional device on the outdoor unit, the method is simple, but the requirement of the lowest rotating speed is met for ensuring the stable operation of an outdoor fan, particularly for products with high energy efficiency, the outdoor condenser is large, even if the outdoor fan is at the lowest rotating speed, the condensing side pressure is still difficult to improve, the low-temperature refrigerating performance is poor under the condition, and the method II has the disadvantages of high cost and complex operation due to the additional device.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention provides a control method of an outdoor fan of an air conditioner, which meets the refrigeration requirement in a low-temperature environment.
According to the control method of the outdoor fan of the air conditioner, the air conditioner comprises a compressor, an outdoor heat exchanger and an indoor heat exchanger, and the control method comprises the following steps: controlling the air conditioner to perform cooling operation, detecting the outdoor environment temperature T4 and judging whether the detected result is greater than a preset environment temperature i; when the detected outdoor environment temperature T4 is greater than a preset environment temperature i, controlling the outdoor fan to keep a current forward rotation state; when the detected outdoor environment temperature T4 is less than a preset environment temperature i, detecting the rotating speed of the outdoor fan and a detection object, wherein the detection object is at least one of the operating frequency F of the compressor, the temperature T3 of the outdoor heat exchanger and the pressure PL in the indoor heat exchanger; when the rotating speed of the outdoor fan is detected to be a preset rotating speed and the detection result of the detection object meets a preset condition, controlling the outdoor fan to reversely rotate; and when the rotating speed of the outdoor fan is higher than the preset rotating speed or the detection result of the detection object does not meet the preset condition, controlling the outdoor fan to keep the current forward rotation state.
According to the control method of the outdoor fan of the air conditioner, when the outdoor environment temperature T4 is detected to be lower than the preset environment temperature i, the rotating speed of the outdoor fan is detected to be the preset rotating speed, and the detection result of the detection object meets the preset condition, the outdoor fan is controlled to reversely rotate, so that the air quantity of the outdoor unit can be reduced, the condensing side pressure of the outdoor unit can be increased, the pressure difference of a refrigeration flow path of the air conditioner can be ensured to be formed, the refrigeration requirement under the low-temperature environment can be met, the air conditioner can continuously output cold, and the use comfort is ensured.
In some embodiments of the present invention, the detection object is an operating frequency F of the compressor, and the predetermined condition is that the operating frequency F of the compressor is less than a set frequency F.
In some embodiments of the present invention, the detection object is a temperature T3 of the outdoor heat exchanger, and the predetermined condition is that the temperature T3 of the outdoor heat exchanger is less than a set temperature g.
In some embodiments of the present invention, the detection object is a pressure PL inside the indoor heat exchanger, and the predetermined condition is that the pressure PL inside the indoor heat exchanger is lower than a set pressure K.
In some embodiments of the present invention, the detection objects are an operating frequency F of the compressor, a temperature T3 of the outdoor heat exchanger, and a pressure PL inside the indoor heat exchanger, and the predetermined conditions are that the operating frequency F of the compressor is less than a set frequency F, the temperature T3 of the outdoor heat exchanger is less than a set temperature g, or the pressure PL inside the indoor heat exchanger is lower than a set pressure K.
Specifically, the pressure PL in the indoor heat exchanger is obtained by detecting the pressure of the refrigerant in the inlet end of the indoor heat exchanger.
In some embodiments of the present invention, a plurality of outdoor environment temperature intervals are preset, where the plurality of outdoor environment temperature intervals correspond to different rotation speeds of the outdoor fan, and when the detected outdoor environment temperature T4 is greater than the predetermined environment temperature i, the rotation speed of the outdoor fan is adjusted according to a rotation speed value corresponding to the outdoor environment temperature interval where the detected outdoor environment temperature T4 is located.
In some embodiments of the present invention, the predetermined rotation speed is an allowable minimum rotation speed when the outdoor fan is rotated in the forward direction.
Drawings
Fig. 1 is a flowchart of a control method of an outdoor fan according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of an outdoor fan according to another embodiment of the present invention;
fig. 3 is a flowchart of a control method of an outdoor fan according to still another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A method for controlling an outdoor fan of an air conditioner according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 3. The air conditioner comprises a compressor, an outdoor heat exchanger and an indoor heat exchanger, and can be understood as a single-cooling type air conditioner or a cooling and heating type air conditioner. The cooling principle or the heating principle of the air conditioner is known in the art and will not be described in detail here.
The control method of the outdoor fan of the air conditioner comprises the following steps:
and controlling the air conditioner to perform cooling operation, detecting the outdoor ambient temperature T4 and judging whether the detected result is greater than a preset ambient temperature i.
When the detected outdoor ambient temperature T4 is greater than the predetermined ambient temperature i, the outdoor fan is controlled to maintain the current forward rotation state, that is, the outdoor fan is still in the forward rotation to direct air to the outdoor heat exchanger.
When the detected outdoor environment temperature T4 is less than the preset environment temperature i, the outdoor environment temperature is low, and at the moment, the rotating speed of the outdoor fan and a detection object are detected, wherein the detection object is at least one of the running frequency F of the compressor, the temperature T3 of the outdoor heat exchanger and the pressure PL in the indoor heat exchanger. In some examples of the present invention, the detection object is one of an operation frequency F of the compressor, a temperature T3 of the outdoor heat exchanger, and a pressure PL inside the indoor heat exchanger. In other examples of the present invention, the detection objects are the operating frequency F of the compressor, the temperature T3 of the outdoor heat exchanger, and the pressure PL inside the indoor heat exchanger. In still other examples of the present invention, the detection objects are two of the operating frequency F of the compressor, the temperature T3 of the outdoor heat exchanger, and the pressure PL inside the indoor heat exchanger. Wherein the temperature T3 of the outdoor heat exchanger can be obtained by detecting the coil temperature of the outdoor heat exchanger.
When the rotating speed of the outdoor fan is detected to be the preset rotating speed and the detection result of the detection object meets the preset condition, the outdoor fan is controlled to rotate reversely; and when the rotating speed of the outdoor fan is detected to be higher than the preset rotating speed or the detection result of the detection object does not meet the preset condition, controlling the outdoor fan to keep the current forward rotation state. Specifically, the predetermined rotation speed is an allowable minimum rotation speed when the outdoor fan rotates forward.
Specifically, when two conditions need to be satisfied simultaneously, the outdoor fan performs reverse rotation operation, where the first condition is that the rotation speed of the outdoor fan is a predetermined rotation speed, and the second condition is that the detection result of the detection object satisfies the predetermined condition. The outdoor fan keeps the current forward rotation state as long as one of the first condition and the second condition is not met.
When the detection object is only the operation frequency F of the compressor, it indicates that the detection result of the detection object satisfies the predetermined condition when the operation frequency F of the compressor is less than the set frequency F, in other words, the predetermined condition is that the operation frequency F of the compressor is less than the set frequency F. When the detection object is only the temperature T3 of the outdoor heat exchanger, it indicates that the detection result of the detection object satisfies the predetermined condition when the temperature T3 of the outdoor heat exchanger is less than the set temperature g, in other words, the predetermined condition is that the temperature T3 of the outdoor heat exchanger is less than the set temperature g. When the detection target is only the pressure PL inside the indoor heat exchanger, it indicates that the detection result of the detection target satisfies the predetermined condition when the pressure PL inside the indoor heat exchanger is lower than the set pressure K, in other words, the predetermined condition is that the pressure PL inside the indoor heat exchanger is lower than the set pressure K.
When the detection objects are the operating frequency F of the compressor, the temperature T3 of the outdoor heat exchanger, and the pressure PL inside the indoor heat exchanger, the predetermined condition may be that one of the operating frequency F of the compressor is less than the set frequency F, the temperature T3 of the outdoor heat exchanger is less than the set temperature g, and the pressure PL of the indoor heat exchanger is less than the set pressure K is satisfied, or that two of the operating frequency F of the compressor is less than the set frequency F, the temperature T3 of the outdoor heat exchanger is less than the set temperature g, and the pressure PL of the indoor heat exchanger is less than the set pressure K are satisfied at the same time, or that the operating frequency F of the compressor is less than the set frequency F, the temperature T3 of the outdoor heat exchanger is less than the set temperature g, and the pressure PL of the.
When the detection objects are two of the operating frequency F of the compressor, the temperature T3 of the outdoor heat exchanger, and the pressure PL inside the indoor heat exchanger, the predetermined condition will be described by taking the detection objects as the operating frequency F of the compressor and the temperature T3 of the outdoor heat exchanger as examples, in which case, the predetermined condition may be that the operating frequency F of the compressor is less than the set frequency F or the temperature T3 of the outdoor heat exchanger is less than the set temperature g, and the predetermined condition may also be that the operating frequency F of the compressor is less than the set frequency F and the temperature T3 of the outdoor heat exchanger is less than the set temperature g at the same time.
It should be noted that, in the above description, when the outdoor fan is controlled to maintain the current forward rotation state, the outdoor fan may be controlled to maintain the current rotation speed, or the rotation speed of the outdoor fan may be adjusted according to actual conditions, as long as the outdoor fan is maintained to rotate forward. It should be further noted that the value of the predetermined environmental temperature i may be limited according to actual situations, for example, the value of the predetermined environmental temperature i may range from-15 ℃ to-10 ℃.
According to the control method of the outdoor fan of the air conditioner, when the outdoor environment temperature T4 is detected to be lower than the preset environment temperature i, the rotating speed of the outdoor fan is detected to be the preset rotating speed, and the detection result of the detection object meets the preset condition, the outdoor fan is controlled to reversely rotate, so that the air quantity of the outdoor unit can be reduced, the condensing side pressure of the outdoor unit can be increased, the pressure difference of a refrigeration flow path of the air conditioner can be ensured to be formed, the refrigeration requirement under the low-temperature environment can be met, the air conditioner can continuously output cold, and the use comfort is ensured.
As shown in fig. 1, in some embodiments of the present invention, the detection object is an operating frequency F of the compressor, and the predetermined condition is that the operating frequency F of the compressor is less than a set frequency F, specifically, during cooling operation, an outdoor environment temperature T4, a rotation speed of the outdoor fan, and the operating frequency F of the compressor are detected, and when it is detected that the outdoor environment temperature T4 is less than a predetermined environment temperature i, the rotation speed D of the outdoor fan is a predetermined rotation speed h, and the operating frequency F of the compressor is less than the set frequency F, the outdoor fan is controlled to rotate in reverse, so as to reduce an outdoor unit air volume, and it can be ensured that a pressure difference can be formed in a cooling flow path of the air conditioner, so that the air conditioner can continuously output cold.
As shown in fig. 2, in some embodiments of the present invention, the detection object is a temperature T3 of the outdoor heat exchanger, and the predetermined condition is that the temperature T3 of the outdoor heat exchanger is less than the set temperature g. Specifically, during cooling operation, the outdoor environment temperature T4, the rotating speed of the outdoor fan and the temperature T3 of the outdoor heat exchanger are detected, and when the outdoor environment temperature T4 is less than the preset environment temperature i, the rotating speed D of the outdoor fan is the preset rotating speed h, and the temperature T3 of the outdoor heat exchanger is less than the set temperature g, the outdoor fan is controlled to rotate reversely.
As shown in fig. 3, in some embodiments of the present invention, the detection object is the pressure PL inside the indoor heat exchanger, and the predetermined condition is that the pressure PL inside the indoor heat exchanger is lower than the set pressure K. Specifically, during cooling operation, the outdoor environment temperature T4, the rotating speed of the outdoor fan and the pressure PL in the indoor heat exchanger are detected, and when the outdoor environment temperature T4 is less than the preset environment temperature i, the rotating speed D of the outdoor fan is the preset rotating speed h, and the pressure PL in the indoor heat exchanger is less than the set pressure K, the outdoor fan is controlled to rotate reversely, so that the evaporation temperature of the indoor heat exchanger can be increased, and the low-temperature cooling performance of the air conditioner can be improved.
In some embodiments of the present invention, the detection objects are an operating frequency F of the compressor, a temperature T3 of the outdoor heat exchanger, and a pressure PL inside the indoor heat exchanger, and the predetermined conditions are that the operating frequency F of the compressor is less than a set frequency F, the temperature T3 of the outdoor heat exchanger is less than a set temperature g, or the pressure PL inside the indoor heat exchanger is lower than a set pressure K. Specifically, during cooling operation, the outdoor environment temperature T4, the rotating speed of the outdoor fan, the operating frequency F of the compressor, the temperature T3 of the outdoor heat exchanger and the pressure PL inside the indoor heat exchanger are detected, and when the outdoor environment temperature T4 is less than the preset environment temperature i, the rotating speed D of the outdoor fan is detected to be the preset rotating speed h, and one of the conditions that the operating frequency F of the compressor is less than the set frequency F, the temperature T3 of the outdoor heat exchanger is less than the set temperature g and the pressure PL inside the indoor heat exchanger is lower than the set pressure K is met, the outdoor fan is controlled to rotate reversely.
In some embodiments of the present invention, the pressure PL in the indoor heat exchanger is obtained by detecting a pressure of the refrigerant in the inlet end of the indoor heat exchanger.
According to some embodiments of the present invention, a plurality of outdoor environment temperature intervals are preset, the plurality of outdoor environment temperature intervals correspond to different rotation speeds of the outdoor fan, and when the detected outdoor environment temperature T4 is greater than the predetermined environment temperature i, the rotation speed of the outdoor fan is adjusted according to the rotation speed value corresponding to the outdoor environment temperature interval where the detected outdoor environment temperature T4 is located. Therefore, the rotating speed of the outdoor fan can be adjusted according to actual conditions, the condensation effect of the outdoor heat exchanger is optimal, and the refrigeration effect is improved. It can be understood that the specific value ranges of the plurality of outdoor environment temperature intervals can be limited according to actual situations.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (8)

1. A control method of an outdoor fan of an air conditioner, the air conditioner comprises a compressor, an outdoor heat exchanger and an indoor heat exchanger, and the control method is characterized by comprising the following steps:
controlling the air conditioner to perform cooling operation, detecting the outdoor environment temperature T4 and judging whether the detected result is greater than a preset environment temperature i;
when the detected outdoor environment temperature T4 is greater than a preset environment temperature i, controlling the outdoor fan to keep a current forward rotation state; when the detected outdoor environment temperature T4 is less than a preset environment temperature i, detecting the rotating speed of the outdoor fan and a detection object, wherein the detection object is at least one of the operating frequency F of the compressor, the temperature T3 of the outdoor heat exchanger and the pressure PL in the indoor heat exchanger;
when the rotating speed of the outdoor fan is detected to be a preset rotating speed and the detection result of the detection object meets a preset condition, controlling the outdoor fan to reversely rotate; when the rotating speed of the outdoor fan is detected to be higher than the preset rotating speed or the detection result of the detection object does not meet the preset condition, controlling the outdoor fan to keep the current forward rotation state; the predetermined conditions are at least one of the operating frequency F of the compressor being less than the set frequency F, the temperature T3 of the outdoor heat exchanger being less than the set temperature g, and the pressure PL of the indoor heat exchanger being less than the set pressure K.
2. The method of controlling an outdoor fan of an air conditioner according to claim 1, wherein the detection object is an operating frequency F of the compressor, and the predetermined condition is that the operating frequency F of the compressor is less than a set frequency F.
3. The method of controlling an outdoor fan of an air conditioner according to claim 1, wherein the detection object is a temperature T3 of the outdoor heat exchanger, and the predetermined condition is that the temperature T3 of the outdoor heat exchanger is less than a set temperature g.
4. The method of controlling an outdoor fan of an air conditioner according to claim 1, wherein the detection object is a pressure PL inside the indoor heat exchanger, and the predetermined condition is that the pressure PL inside the indoor heat exchanger is lower than a set pressure K.
5. The control method of an outdoor fan of an air conditioner according to claim 1, wherein the detection objects are an operating frequency F of the compressor, a temperature T3 of the outdoor heat exchanger, and a pressure PL inside the indoor heat exchanger, and the predetermined conditions are that the operating frequency F of the compressor is less than a set frequency F, the temperature T3 of the outdoor heat exchanger is less than a set temperature g, or the pressure PL inside the indoor heat exchanger is lower than a set pressure K.
6. The method of claim 4 or 5, wherein the pressure PL inside the indoor heat exchanger is obtained by detecting a pressure of the refrigerant inside an inlet end of the indoor heat exchanger.
7. The method of claim 1, wherein a plurality of outdoor environment temperature intervals corresponding to different rotation speeds of the outdoor fan are preset, and when the detected outdoor environment temperature T4 is greater than a predetermined environment temperature i, the rotation speed of the outdoor fan is adjusted according to a rotation speed value corresponding to the outdoor environment temperature interval where the detected outdoor environment temperature T4 is located.
8. The method of claim 1, wherein the predetermined rotational speed is a lowest allowable rotational speed when the outdoor fan is rotated in the forward direction.
CN201610799169.7A 2016-08-31 2016-08-31 Control method for outdoor fan of air conditioner Active CN106322679B (en)

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CN107906682B (en) * 2017-11-03 2020-07-14 广东美的暖通设备有限公司 Control method and device of air conditioning system and air conditioner
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CN109210675B (en) * 2018-08-01 2020-04-24 珠海格力电器股份有限公司 Control method, device and equipment for air conditioner outdoor fan and air conditioner
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CN110454936B (en) * 2019-08-05 2021-03-19 广东美的制冷设备有限公司 Air conditioner and control method and device thereof
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