WO2017077649A1 - Unité extérieure de climatiseur - Google Patents

Unité extérieure de climatiseur Download PDF

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Publication number
WO2017077649A1
WO2017077649A1 PCT/JP2015/081355 JP2015081355W WO2017077649A1 WO 2017077649 A1 WO2017077649 A1 WO 2017077649A1 JP 2015081355 W JP2015081355 W JP 2015081355W WO 2017077649 A1 WO2017077649 A1 WO 2017077649A1
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WO
WIPO (PCT)
Prior art keywords
temperature
control box
control board
air
outdoor unit
Prior art date
Application number
PCT/JP2015/081355
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English (en)
Japanese (ja)
Inventor
正 有山
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2017548603A priority Critical patent/JP6529600B2/ja
Priority to PCT/JP2015/081355 priority patent/WO2017077649A1/fr
Publication of WO2017077649A1 publication Critical patent/WO2017077649A1/fr

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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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/20—Electric components for separate outdoor units

Definitions

  • the present invention relates to an outdoor unit of an air conditioner having a control box containing electrical components.
  • the environmental temperature in the control box is lowered by the cold air from the evaporator when starting the air conditioner or operating the air conditioner, and it may be lower than the allowable lower limit temperature of the electrical equipment. .
  • the environmental temperature in the control box is lowered by the cold air from the evaporator when starting the air conditioner or operating the air conditioner, and it may be lower than the allowable lower limit temperature of the electrical equipment. .
  • the present invention has been made to solve the above-described problems, and even when the air conditioner is operated in a cryogenic environment, the environmental temperature in the control box and the temperature of the electrical components are
  • An object of the present invention is to obtain an outdoor unit of an air conditioner that maintains a certain level of air quality.
  • An outdoor unit of an air conditioner includes a housing, a control box disposed in the housing and containing a control board, a temperature sensor for detecting the temperature inside the control box, and the control box.
  • a heating device that heats the inside, and the heating device starts to be driven when a temperature detected by the temperature sensor falls below a lower limit value of an allowable temperature of the control board.
  • the heating device is configured to start driving when the temperature detected by the temperature sensor falls below the lower limit value of the allowable temperature of the control board. In this way, even when the air conditioner is operated in a cryogenic environment, the environmental temperature in the control box and the temperature of the electrical components are kept above a certain level, and the deterioration and life of each electrical component is maintained. It is possible to obtain an outdoor unit of an air conditioner that suppresses the decrease of the air conditioner.
  • FIG. 1 It is a schematic side sectional view of a control box provided inside the outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. It is a schematic sectional side view of the control box provided in the inside of the outdoor unit of the air conditioning apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the state of the Peltier device provided in the inside of the outdoor unit of the air conditioning apparatus which concerns on Embodiment 2 of this invention.
  • FIG. [Configuration of air conditioner] 1 is a schematic circuit configuration diagram illustrating an example of a circuit configuration including an outdoor unit of an air-conditioning apparatus according to Embodiment 1 of the present invention.
  • the air conditioner 100 includes an outdoor unit 1 and an indoor unit 2, and the outdoor unit 1 and the indoor unit 2 are connected by a refrigerant main pipe 3 and a refrigerant main pipe 7.
  • a compressor 5, a switching valve 8 such as a four-way valve, and an outdoor heat exchanger 6 are connected by a refrigerant pipe 4.
  • the outdoor unit 1 includes an outdoor fan 9 and a control box 22.
  • the compressor 5 sucks a low-temperature and low-pressure refrigerant and compresses the refrigerant to a high-temperature and high-pressure state.
  • the compressor 5 is composed of, for example, an inverter compressor capable of capacity control.
  • An outdoor fan 9 and a control box 22 are provided in the vicinity of the outdoor heat exchanger 6, and the outdoor fan 9 blows air to the outdoor heat exchanger 6.
  • the outdoor heat exchanger 6 functions as a condenser during the cooling operation, and functions as an evaporator during the heating operation.
  • the outdoor heat exchanger 6 performs heat exchange between the air supplied from the outdoor blower 9 such as a fan and the refrigerant. It is.
  • the switching valve 8 has a first port 8a, a second port 8b, a third port 8c, and a fourth port 8d. By connecting the ports to each other, the refrigerant flow and the heating operation in the cooling operation mode, which will be described later, are performed. The refrigerant flow in the mode is switched.
  • the indoor unit 2 includes an indoor fan 12, an indoor heat exchanger 10, and a throttle device 11.
  • the indoor unit 2 is connected to the outdoor unit 1 via the refrigerant main pipe 3 and the refrigerant main pipe 7 so that the refrigerant flows in or out.
  • the compressor 5, the outdoor heat exchanger 6, the expansion device 11, and the indoor heat exchanger 10 are sequentially connected via the pipe to constitute the refrigerant circuit of the air conditioner 100.
  • the indoor heat exchanger 10 performs heat exchange between air supplied from an indoor blower 12 such as a fan and a refrigerant, and generates heating air or cooling air to be supplied to an indoor space.
  • the expansion device 11 has a function as a pressure reducing valve or an expansion valve, expands the refrigerant by depressurizing it, and is preferably constituted by a device whose opening degree can be variably controlled, for example, an electronic expansion valve.
  • FIG. 2 is a refrigerant circuit diagram illustrating a refrigerant flow in the cooling operation mode of the outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention.
  • the switching valve 8 in the cooling operation mode, the switching valve 8 is in a state where the first port 8a and the second port 8b communicate with each other, and the third port 8c and the fourth port 8d communicate with each other. It becomes. In this way, the refrigerant flows in the direction indicated by the solid arrow in FIG.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 5 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 5 flows into the outdoor heat exchanger 6 through the switching valve 8.
  • the high-temperature high-pressure gas refrigerant that has flowed into the outdoor heat exchanger 6 is condensed while dissipating heat to the outdoor air, and becomes high-pressure liquid refrigerant.
  • the outdoor air heated by the outdoor heat exchanger 6 passes through the control box 22 and is discharged out of the outdoor unit 1 by the outdoor blower 9.
  • the high-pressure liquid refrigerant that has flowed out of the outdoor heat exchanger 6 flows out of the outdoor unit 1, passes through the refrigerant main pipe 7, and flows into the indoor unit 2.
  • the high-pressure liquid refrigerant that has flowed into the indoor unit 2 is reduced to a low-temperature and low-pressure two-phase refrigerant by the expansion device 11 and then flows into the indoor heat exchanger 10 that functions as an evaporator.
  • the low-temperature and low-pressure two-phase refrigerant cools the room air by absorbing heat from the room air, and becomes a low-temperature and low-pressure gas refrigerant.
  • the low-temperature and low-pressure gas refrigerant that has flowed out of the indoor heat exchanger 10 passes through the refrigerant main pipe 3 and flows into the outdoor unit 1.
  • the refrigerant flowing into the outdoor unit 1 passes through the switching valve 8 and is sucked into the compressor 5.
  • the cooling operation mode is performed by circulating the refrigerant in this way.
  • FIG. 3 is a refrigerant circuit diagram illustrating a refrigerant flow in the heating operation mode of the outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention.
  • the switching valve 8 in the heating operation mode, the switching valve 8 is in a state where the first port 8a and the third port 8c communicate with each other, and the second port 8b and the fourth port 8d communicate with each other. It becomes. In this way, the refrigerant flows in the direction indicated by the solid arrow in FIG.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 5 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 5 flows into the indoor unit 2 through the refrigerant main pipe 3 via the switching valve 8.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the indoor unit 2 radiates heat to the indoor air in the indoor heat exchanger 10, becomes a high-pressure liquid refrigerant, and flows into the expansion device 11.
  • the refrigerant flows out of the indoor unit 2, passes through the refrigerant main pipe 7, and flows into the outdoor unit 1.
  • the low-temperature and low-pressure two-phase refrigerant flowing into the outdoor unit 1 becomes a low-temperature and low-pressure gas refrigerant by absorbing heat from the outdoor air in the outdoor heat exchanger 6.
  • the outdoor air cooled by the outdoor heat exchanger 6 passes through the control box 22 and is discharged out of the outdoor unit 1 by the outdoor blower 9.
  • the low-temperature and low-pressure gas refrigerant exiting the outdoor heat exchanger 6 passes through the switching valve 8 and is sucked into the compressor 5.
  • heating operation mode is performed because a refrigerant
  • coolant circulates.
  • the air conditioner 100 can perform both the cooling operation mode and the heating operation mode.
  • this invention is not limited to this,
  • the air conditioning apparatus 100 when using the air conditioning apparatus 100 in a very cold region, it is good also as a structure of the refrigerant circuit which drive
  • FIG. 4 is a schematic internal configuration diagram of the outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention.
  • the outdoor unit 1 of the air conditioning apparatus 100 includes a housing 21 and an outdoor fan 9 provided on the top of the housing 21. Inside the casing 21, a control box 22, an outdoor heat exchanger 6, a compressor 5 (not shown), and a switching valve 8 (not shown) are provided.
  • the casing 21 is formed with an air passage 26 serving as an outdoor outdoor air passage for sending air to the outdoor heat exchanger 6.
  • the outdoor blower 9 blows outdoor air to the air passage 26 formed in the housing 21. Then, when the outdoor blower 9 provided at the upper portion of the casing 21 is rotationally driven, outdoor air flows in the casing 21 from the lower side to the upper side as indicated by the air passage 26.
  • the control box 22 is provided with a heat sink 23 a and a heat sink 23 b on the outer surface in contact with the air passage 26.
  • the heat sink 23a and the heat sink 23b are cooled by the outdoor air flowing toward it.
  • casing 21 was shown in this Embodiment 1, this invention is not limited to this, You may provide in places other than the upper part of the housing
  • FIG. 5 is a schematic side sectional view of the control box provided inside the outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention.
  • the control box 22 includes a heat sink 23 a, a heat sink 23 b, a control board 27 a, a control board 27 b, a temperature sensor 28 a, a temperature sensor 28 b, and an electric heater 31.
  • the heat sink 23a is installed above the heat sink 23b.
  • the control board 27a is installed above the control board 27b.
  • the temperature sensor 28a is installed above the temperature sensor 28b.
  • an example in which two heat sinks, a control board, and a temperature sensor are provided has been described, but the present invention is not limited to this, and three or more heat sensors may be provided. The same applies to the second embodiment described later.
  • the control board 27a and the control board 27b control the air conditioning apparatus 100, and are boards on which, for example, an inverter circuit and a harmonic suppression circuit are formed.
  • the control board 27a is connected to the back plate 29 via the base 24a.
  • the control board 27b is connected to the back plate 29 through the base 24b.
  • the heat sink 23a and the control board 27a are provided adjacent to each other through the back plate 29 and the base 24a of the control box 22.
  • the heat sink 23b and the control board 27b are provided adjacent to each other via the back plate 29 and the base 24b of the control box 22.
  • the electrical components formed on the control board 27a and the control board 27b are cooled via the heat sink 23a and the heat sink 23b that are cooled by the wind passing through the air path 26.
  • the distribution state of the environmental temperature in the control box 22 will be described.
  • a difference occurs in the density of air inside the control box 22 due to heat generation of electrical components such as an inverter circuit. Due to the nature of the difference in air density, a temperature distribution is generated in the vertical direction inside the control box 22, and the temperature inside the control box 22 is high. On the other hand, the temperature inside the control box 22 is lower.
  • the outdoor heat exchanger 6 used in the heating operation used under the condition of low temperature outside air functions as an evaporator, and the temperature of the refrigerant flowing through the outdoor heat exchanger 6 is lower than the outside air temperature. ing.
  • the outdoor air cooled through the outdoor heat exchanger 6 passes through the air passage 26 and hits the lower part of the control box 22, so that the above-described temperature distribution is further promoted.
  • a temperature sensor 28 b for detecting a decrease in the environmental temperature inside the control box 22 is provided inside the control box 22.
  • the temperature sensor 28b is disposed below the control box 22, particularly at the lowermost portion of the control board 27b where a lower limit value of the temperature range is expected. By doing so, it is possible to grasp how many times the temperature state of the control board 27a and the control board 27b provided in the control box 22 is over while reducing the number of measurement points inside the control box 22. Can do.
  • the electric heater 31 is used as means for increasing the temperature between the control board 27a and the control board 27b and the environmental temperature inside the control box 22. Provided below the inside of the. By disposing the electric heater 31 below the inside of the control box 22, particularly at the bottom, the control board 27b provided below the inside of the control box 22 where the environmental temperature is likely to be lowered can be heated. In addition, with respect to the control board 27a provided above the control board 27b, the air heated by the electric heater 31 is raised by natural convection, whereby the control board 27a can be heated. Thus, by installing the electric heater 31 below the inside of the control box 22, the entire control box 22 can be efficiently heated.
  • the electric heater 31 corresponds to the “heating device” in the present invention.
  • the operation of the electric heater 31 will be described.
  • the outdoor unit 1 when the outside air temperature is in a low temperature state, when the temperature detected by the temperature sensor 28b falls below the lower limit value of the allowable temperature of the control board 27a and the control board 27b, the driving of the electric heater 31 is started.
  • the temperature detected by the temperature sensor 28b becomes a certain value or more, for example, when the temperature exceeds the upper limit value of the allowable temperature of the control board 27a and the control board 27b, the driving of the electric heater 31 is stopped.
  • the allowable temperature refers to a temperature range in which the control boards 27a and 27b operate normally and no failure occurs.
  • the environmental temperature inside the control box 22 and the temperatures of the control board 27a and the control board 27b are kept above a certain level, Deterioration of products and reduction of service life can be suppressed.
  • the air conditioner 100 when the air conditioner 100 is operated under a condition where the outside air temperature is high, in order to protect the upper limit of the temperature range of the control board 27a and the control board 27b, the upper side of the control box 22, particularly the top of the control board 27a. It is preferable to install a temperature sensor 28a at the top. When the temperature detected by the temperature sensor 28a exceeds the upper limit value of the allowable temperature of the control board 27a and the control board 27b, the temperature of the control board 27a and the control board 27b is reduced by reducing the operation load of the outdoor unit 1. The rise can be suppressed.
  • the outdoor unit 1 of the air conditioning apparatus 100 includes the housing 21, the control box 22 that is disposed in the housing 21 and houses the control boards 27a and 27b,
  • the temperature sensor 28a, 28b for detecting the temperature inside the control box 22 and a heat generating device for heating the inside of the control box 22 are provided.
  • the heat generating device has a temperature detected by the temperature sensor 28a, 28b and the control board 27a, 27b. When the temperature falls below the lower limit of the allowable temperature, the drive is started.
  • the outdoor unit 1 of the air conditioning apparatus 100 which keeps the environmental temperature in the control box 22 and the temperature of an electrical component more than fixed, and suppresses deterioration of each electrical component and lifetime reduction can be obtained.
  • two temperature sensors 28 a and 28 b are provided above and below the control box 22. By doing in this way, the environmental temperature inside the control box 22 can be efficiently detected with a small number of temperature sensors.
  • the electric heater 31 is provided below the control box 22.
  • the air heated below the control box 22 rises by natural convection, so that the air above the control box 22 and electrical components can be efficiently heated.
  • the electric heater 31 starts driving when the temperature detected by the lower temperature sensor 28b of the temperature sensors 28a and 28b falls below the lower limit value of the allowable temperature of the control boards 27a and 27b mounted on the control box 22.
  • the drive is stopped when the temperature detected by the upper temperature sensor 28a of the temperature sensors 28a and 28b exceeds the upper limit value of the allowable temperature of the control boards 27a and 27b mounted on the control box 22.
  • the outdoor unit 1 of the air conditioning apparatus 100 which keeps the environmental temperature in the control box 22 and the temperature of an electrical component constant, and suppresses deterioration of each electrical component and a lifetime reduction can be obtained.
  • Embodiment 2 Since the basic configuration of the outdoor unit of the air-conditioning apparatus in the second embodiment is the same as that of the outdoor unit of the air-conditioning apparatus in the first embodiment, the present embodiment will be mainly described below with respect to differences from the first embodiment. Form 2 will be described. The difference between the first embodiment and the second embodiment is that the heat generating device is composed of Peltier elements.
  • FIG. 6 is a schematic side cross-sectional view of a control box provided in the outdoor unit of the air-conditioning apparatus according to Embodiment 2 of the present invention.
  • the control box 22 controls the air conditioner 100.
  • the control box 22 includes a heat sink 23c, a heat sink 23d, a control board 27a, a control board 27b, a temperature sensor 28a, a temperature sensor 28b, a Peltier element 29a, and a Peltier element 29b.
  • the Peltier element 29a is provided above the Peltier element 29b.
  • the Peltier element 29a is disposed on the inner wall surface of the control box 22 so as to be in contact with the control board 27a via the heat sink 23c. That is, the Peltier element 29a constitutes the base of the control board 27a.
  • the Peltier element 29b is disposed on the inner wall surface of the control box 22 so as to contact the control board 27b via the heat sink 23d. That is, the Peltier element 29b constitutes the base of the control board 27b.
  • the temperature sensor 28a is raised above the control box 22, particularly by operation, so as not to exceed the allowable upper limit temperature of each electrical component. Is disposed on the uppermost portion of the control board 27a.
  • the operating load of the outdoor unit 1 is reduced to suppress the temperature rise inside the control box 22 and protect the electrical components. be able to.
  • the control board 27a is cooled without lowering the operating load of the outdoor unit 1 by applying power to the Peltier element 29a so that the surface of the Peltier element 29a contacting the heat sink 23c becomes a cooling surface. You can also.
  • the above-described Peltier element 29a and Peltier element 29b can exchange the cooling surface and the heating surface by changing the polarity of charging. Therefore, the temperature state inside the control box 22 is detected based on the detected temperature of the temperature sensor 28a and the temperature sensor 28b, whether the Peltier element 29a and the Peltier element 29b need to be heated, and the cooling surface and the heating surface. Switching can be done. In this way, it is possible to realize an increase in the temperature of the control boards 27a and 27b under a situation where the outside air temperature is low. In addition, it is possible to suppress an increase in the temperature of the control boards 27a and 27b under a situation where the outside air temperature is high.
  • FIG. 7 is a diagram illustrating a state of the Peltier element provided in the outdoor unit of the air-conditioning apparatus according to Embodiment 2 of the present invention.
  • the threshold value of the allowable upper limit temperature necessary for protecting the control board 27a at the temperature detected by the temperature sensor 28a is D.
  • C be the threshold value of the allowable lower limit temperature necessary for protecting the control board 27a at the temperature detected by the temperature sensor 28a.
  • the Peltier element 29a is energized so that the surface in contact with the heat sink 23c, that is, the control board 27a side becomes the cooling surface.
  • the Peltier element 29a When the temperature detected by the temperature sensor 28a is lower than the threshold value C, the Peltier element 29a is energized so that the surface in contact with the heat sink 23c, that is, the control board 27a side becomes the heating surface. On the other hand, when the temperature detected by the temperature sensor 28a is between the threshold values D and C, the Peltier element 29a is not energized.
  • the threshold value of the allowable upper limit temperature necessary for protecting the control board 27b at the temperature detected by the temperature sensor 28b is B.
  • the threshold value of the allowable lower limit temperature necessary for protecting the control board 27b at the temperature detected by the temperature sensor 28b is A.
  • the Peltier element 29b is energized so that the surface in contact with the heat sink 23d, that is, the control board 27b side becomes the cooling surface.
  • the temperature detected by the temperature sensor 28b is lower than the threshold value A
  • the Peltier element 29b is energized so that the surface in contact with the heat sink 23d, that is, the control board 27b side becomes the heating surface.
  • the temperature detected by the temperature sensor 28b is between the threshold values B and A, the Peltier element 29b is not energized.
  • the Peltier element 29a and the Peltier element 29b will be described with reference to FIG.
  • the temperature detected by the temperature sensor 28b is lower than the threshold value A, so that the surface that contacts the heat sink 23d of the Peltier element 29b becomes the heating surface.
  • the element 29b is energized.
  • the temperature sensor state 120a since the temperature detected by the temperature sensor 28a is between the threshold values C and D, the Peltier element 29a is not charged.
  • the temperature inside the control box 22 rises due to the heating of the Peltier element 29b and the temperature sensor state 120b is reached, the heating to the Peltier element 29b is finished.
  • the Peltier element 29a and the Peltier element 29b for cooling the control board 27a and the control board 27b, it is not necessary to provide a heat sink on the outer surface of the control box 22, and the control box can be made more compact. Moreover, the restriction that the control box must be installed along the air path in the outdoor unit is eliminated, and the degree of freedom in designing the structural arrangement of the outdoor unit of the air conditioner can be improved.
  • the heat generating device is composed of the Peltier elements 29a and 29b, and the Peltier elements 29a and 29b are the bases of the control boards 27a and 27b mounted on the control box 22. It is composed.
  • the control box can be made more compact.
  • the restriction that the control box must be installed along the air path in the outdoor unit is eliminated, and the degree of freedom in designing the structural arrangement of the outdoor unit of the air conditioner can be improved.
  • the outdoor unit 1 of the air conditioning apparatus 100 which keeps the environmental temperature in the control box 22 and the temperature of an electrical component more than fixed, and suppresses deterioration of each electrical component and lifetime reduction can be obtained.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

Unité extérieure de climatiseur équipée : d'un boîtier ; d'une boîte de commande qui est disposée à l'intérieur du boîtier et stocke un substrat de commande ; de capteurs de température qui détectent la température de l'intérieur de la boîte de commande ; et d'un dispositif de production de chaleur qui chauffe l'intérieur de la boîte de commande. L'entraînement du dispositif de production de chaleur démarre lorsque la température détectée par les capteurs de température tombe sous la limite inférieure de la température admissible du substrat de commande.
PCT/JP2015/081355 2015-11-06 2015-11-06 Unité extérieure de climatiseur WO2017077649A1 (fr)

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JP2017548603A JP6529600B2 (ja) 2015-11-06 2015-11-06 空気調和装置の室外機
PCT/JP2015/081355 WO2017077649A1 (fr) 2015-11-06 2015-11-06 Unité extérieure de climatiseur

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JPWO2020049633A1 (ja) * 2018-09-04 2021-02-15 三菱電機株式会社 空気調和機の室外機
US20220412590A1 (en) * 2021-06-28 2022-12-29 Haier Us Appliance Solutions, Inc. Air conditioning unit with fan performance monitoring by a temperature sensor

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CN114110737A (zh) * 2020-08-27 2022-03-01 广东美的暖通设备有限公司 室外机及其控制方法、控制系统、空调器和存储介质

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JP2001015819A (ja) * 1999-07-01 2001-01-19 Sunx Ltd 温度制御方法及び装置
JP2001264668A (ja) * 2000-03-15 2001-09-26 Ricoh Co Ltd 光走査装置
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JPWO2020049633A1 (ja) * 2018-09-04 2021-02-15 三菱電機株式会社 空気調和機の室外機
CN112567180A (zh) * 2018-09-04 2021-03-26 三菱电机株式会社 空调机的室外机
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US20220412590A1 (en) * 2021-06-28 2022-12-29 Haier Us Appliance Solutions, Inc. Air conditioning unit with fan performance monitoring by a temperature sensor

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