US20200355385A1 - Air conditioning device - Google Patents

Air conditioning device Download PDF

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Publication number
US20200355385A1
US20200355385A1 US16/819,179 US202016819179A US2020355385A1 US 20200355385 A1 US20200355385 A1 US 20200355385A1 US 202016819179 A US202016819179 A US 202016819179A US 2020355385 A1 US2020355385 A1 US 2020355385A1
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United States
Prior art keywords
power source
information
air conditioning
conditioning device
compressor
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US16/819,179
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English (en)
Inventor
Chih-Chuan Liang
Wen-Hung Lo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chizentek Inc
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Chizentek Inc
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Filing date
Publication date
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Priority to US16/819,179 priority Critical patent/US20200355385A1/en
Assigned to Chizentek Inc. reassignment Chizentek Inc. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LIANG, CHIH-CHUAN, LO, WEN-HUNG
Publication of US20200355385A1 publication Critical patent/US20200355385A1/en
Abandoned legal-status Critical Current

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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
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/38—Failure diagnosis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • 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
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • 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
    • 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
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • 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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/13—Vibrations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/15—Power, e.g. by voltage or current
    • F25B2700/151—Power, e.g. by voltage or current of the compressor motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser

Definitions

  • the disclosure relates to an air conditioning device, and in particular, to a protection mechanism of an air conditioning device.
  • air conditioning devices In today's society, air conditioning devices have become commonly used devices.
  • the air conditioning devices can be configured to regulate the temperature, humidity and airflow distribution of air. Air in the environment may thereby be maintained in a comfortable state. Based on the characteristic that the air conditioning devices need to work for a long time, electrical and mechanical equipment of the air conditioning devices may fail due to environmental factors and/or deterioration of components. Therefore, it is a very important subject to monitor the air conditioning devices in real time and to maintain a certain degree of appropriateness of the air conditioning devices.
  • the disclosure is directed to provide a protection mechanism with different reaction rates for an air conditioning device so as to effectively maintain a rate of appropriateness of the air conditioning device.
  • an air conditioning device is configured to control an air conditioner.
  • the air conditioning device includes a power supplier, a compressor driver, a fan driver, a vibration sensor, a temperature sensor, a current sensor, a voltage sensor, and an operation processing controller.
  • the power supplier has an input end receiving an input power source and generates a first operating power source and a second operating power source according to the input power source.
  • the compressor driver operates according to the first operating power source to generate a first drive signal to drive a compressor.
  • the fan driver operates according to the first operating power source to generate a second drive signal to drive a fan.
  • the vibration sensor detects vibration information of the air conditioner.
  • the temperature sensor detects a plurality of pieces of temperature information of the air conditioner.
  • the current sensor detects current information of the compressor and the fan.
  • the voltage sensor detects voltage information in the air conditioning device.
  • the operation processing controller is coupled to the power supplier, the compressor driver, the fan driver, the temperature sensor, the current sensor, the voltage sensor, and the vibration sensor, operates according to the second operating power source, and controls the power supplier according to the vibration information, the temperature information, the current information, and the voltage information to determine whether to cut off supply of the first operating power source or stop operation of the compressor and the fan.
  • FIG. 1 is a schematic diagram of an air conditioning device according to an embodiment of the disclosure.
  • FIG. 2 is a schematic diagram of an air conditioning device according to another embodiment of the disclosure.
  • FIG. 3 is a start timing sequence diagram of multiple protection actions of the air conditioning device according to the embodiments of the disclosure.
  • FIG. 1 is a schematic diagram of an air conditioning device according to an embodiment of the disclosure.
  • An air conditioning device 100 includes a power supplier 110 , a compressor driver 120 , a fan driver 130 , a vibration sensor 150 , and an operation processing controller 140 .
  • the power supplier 110 has an input end receiving an input power source VIN.
  • the power supplier 110 generates a first operating power source V 1 and a second operating power source V 2 according to the input power source VIN.
  • the compressor driver 120 and the fan driver 130 are coupled to the power supplier 110 to receive the first operating power source V 1 and operates according to the first operating power source V 1 .
  • the compressor driver 120 is configured to generate a drive signal DRV 1 to drive a compressor 121
  • the fan driver 130 is configured to generate a drive signal DRV 2 to drive a fan 131 .
  • the vibration sensor 150 is disposed on the air conditioning device 100 .
  • the vibration sensor 150 detects vibration information IF of the air conditioning device 100 .
  • the operation processing controller 140 is coupled to the power supplier 110 and the vibration sensor 150 .
  • the operation processing controller 140 receives the second operating power source V 2 and operates according to the second operating power source V 2 . Based on the second operating power source V 2 , the operation processing controller 140 receives the vibration information IF and controls the power supplier 110 according to the vibration information IF to determine whether to cut off the supply of the first operating power source V 1 of the power supplier 110 .
  • the level of the first operating power source V 1 is greater than the level of the second operating power source V 2 .
  • the vibration sensor 150 is configured to sense a vibration state that occurs when the air conditioning device 100 operates.
  • the vibration information IF generated by the vibration sensor 150 can indicate the magnitude of position offset of the air conditioning device 100 caused by vibration.
  • the operation processing controller 140 can determine whether an absolute value of a peak value of the position offset of the air conditioning device 100 is greater than a pre-determined threshold value according to the vibration information IF, and the operation processing controller 140 can inform the power supplier 110 that the supply of the first operating power source V 1 needs to be cut off at this time through a generated control command CMD when the absolute value of the position offset of the air conditioning device 100 is greater than the above-mentioned threshold value.
  • the power supplier 110 may continue to supply the first operating power source V 1 .
  • the operation processing controller 140 may perform interpretation of the vibration information IF by executing software and generates the corresponding control command CMD through a software execution result. That is, in the present embodiment, when the air conditioning device 100 vibrates excessively, the operation processing controller 140 may start a protection action in several mini-seconds (ms) through the software and cut off the supply of the first operating power source V 1 of the power supplier 110 via the control command CMD. Alternatively, in other embodiments, the operation processing controller 140 may not cut off the supply of the first operating power source V 1 of the power supplier 110 and directly send a command to stop the operation of the fan 131 and the compressor 121 .
  • ms mini-seconds
  • the air conditioning device 100 of the embodiment of the disclosure further includes a voltage sensor 170 , a temperature sensor 180 , and a current sensor 160 .
  • the voltage sensor 170 , the temperature sensor 180 , and the current sensor 160 are coupled to the operation processing controller 140 .
  • the voltage sensor 170 , the temperature sensor 180 , and the current sensor 160 provide detected voltage information, temperature information, and current information to the operation processing controller 140 respectively as a basis for how the operation processing controller 140 starts a protection mechanism.
  • the voltage sensor 170 and the current sensor 160 can detect voltage and current states of one or more electronic components in an air conditioner and generate voltage information and current information by detecting whether the voltage and current states are abnormal or not.
  • the temperature sensor 180 may be disposed at one or more locations inside the air conditioner and generates temperature information by detecting a temperature state of each part when the air conditioner works.
  • FIG. 2 is a schematic diagram of an air conditioning device according to another embodiment of the disclosure.
  • An air conditioning device 200 includes a power supplier 210 , a compressor driver 220 , a fan driver 230 , a vibration sensor 250 , an operation processing controller 240 , a voltage sensor 260 , and a fuse F 2 .
  • the power supplier 210 includes an input end 211 , a fuse F 1 , a surge current protector 212 , voltage converters 213 and 214 , a switch SW 1 , a start inrush current protector 215 , and a power factor corrector 216 .
  • the input end 211 is configured to receive an input power source VIN.
  • the fuse Fl is coupled in series between the input end 211 and the surge current protector 212 .
  • the surge current protector 212 is configured to reduce a surge current generated on the input power source VIN.
  • the voltage converter 214 receives the input power source VIN via the surge current protector 212 and performs a voltage conversion action for the input power source VIN to generate a second operating power source V 2 .
  • the voltage converter 214 may be an AC to DC voltage converter.
  • the switch SW 1 is coupled onto a path in which the power supplier 210 outputs a first operating power source V 1 .
  • the switch SW 1 may be turned on or off in accordance with a control command CMD transmitted by the operation processing controller 240 .
  • the start inrush current protector 215 is connected to two ends of the switch SW 1 in a cross-over mode and configured to reduce an inrush current generated by the air conditioning device 200 in the starting process.
  • the voltage converter 213 is coupled to an output end of the start inrush current protector 215 and performs a voltage conversion action for the input power source VIN to generate the first operating power source V 1 when the switch SW 1 is turned on.
  • the level of the first operating power source V 1 is greater than the level of the second operating power source V 2 .
  • the power factor corrector 216 is coupled to an output end providing the first operating power source V 1 so as to perform a power factor correction action of the first operating power source V 1 .
  • the power supplier 210 provides the first operating power source V 1 to the compressor driver 220 and the fan driver 230 .
  • the compressor driver 220 and the fan driver 230 generate drive signals DRV 1 and DRV 2 respectively based on the first operating power source V 1 and make the drive signals DRV 1 and DRV 2 drive a compressor 221 and a fan 231 respectively.
  • the fuse F 2 is disposed in the power supplier 210 and the fan driver 230 .
  • the compressor 221 may feed back a peak current protection signal PC 1 to the compressor driver 220 and make the compressor driver 220 cut off the supply of the drive signal DRV 1 .
  • the fan 231 may feed back a peak current protection signal PC 2 to the fan driver 230 and make the fan driver 230 cut off the supply of the drive signal DRV 2 .
  • the protection actions performed by the compressor driver 220 and the fan driver 230 are performed by means of hardware circuits. Accordingly, the protection actions performed by the compressor driver 220 and the fan driver 230 may be accomplished in several micro-seconds (us).
  • the fuse F 1 and the fuse F 2 may be fused respectively when an overcurrent phenomenon occurs in the input power source VIN and the first operating power source V 1 .
  • the fuse F 1 may be fused to stop the receiving of the input power source VIN.
  • the fuse F 2 may be fused to prevent the fan driver 230 from receiving the first operating power source V 1 , and the purpose of circuit protection is achieved.
  • the fusing action of the fuse F 1 and the fuse F 2 may be completed in several seconds, which is another form of hardware protection action.
  • the compressor driver 220 and the fan driver 230 are coupled to the operation processing controller 240 .
  • the compressor driver 220 and the fan driver 230 transmit abnormality information ABI 1 and ABI 2 to the operation processing controller 240 respectively.
  • the abnormality information ABI 1 includes abnormality information of temperature information of the compressor driver 220 and current information of the compressor driver 220 .
  • the abnormality information ABI 2 includes abnormality information of temperature information of the fan driver 230 and current information of the fan driver 230 .
  • the operation processing controller 240 may generate a control command CMD based on the abnormality information ABI 1 and ABI 2 by executing software.
  • the switch SW 1 is turned off by the control command CMD. By turning off the switch SW 1 , the supply of the first operating power source V 1 may be stopped, and the appropriateness state of hardware components is maintained.
  • the operation processing controller 240 may additionally receive temperature information IFO such as a condenser temperature IF 21 , an ambient temperature IF 22 , a compressor input end temperature IF 23 , and a compressor output end temperature IF 24 .
  • the operation processing controller 240 also receives vibration information IF 1 of the air conditioning device 200 through the vibration sensor 250 .
  • the operation processing controller 240 may perform operation on the abnormality information ABI 1 and ABI 2 , the temperature information IFO, and the vibration information IF 1 by executing software, thereby generating the control command CMD.
  • the voltage sensor 260 may be coupled to an end point where the power supplier 210 generates the first operating power source V 1 and senses the level of the first operating power source V 1 to transmit a sensed result to the operation processing controller 240 .
  • the operation processing controller 240 may also generate a control command according to whether an overvoltage phenomenon occurs in the level of the first operating power source V 1 .
  • the above-mentioned operation processing controller 240 may be a processor with operational capability.
  • FIG. 3 is a start timing sequence diagram of multiple protection actions of the air conditioning device according to the embodiments of the disclosure.
  • protection actions are performed by hardware in the air conditioning device.
  • a protection action is started by software executed by the operation processing controller.
  • the protection actions performed by the compressor driver 220 and the fan driver 230 according to peak current protection signals PCI and PC 2 fed back by the compressor 221 and the fan 231 respectively may occur at time T 11 in the time interval T 1 .
  • the protection action performed by the surge current protector 212 may then occur at time T 12 relatively later than time T 11 in the time interval T 1 .
  • the operation processing controller 240 may make determination based on the current information transmitted by the compressor driver 220 and the fan driver 230 and start a protection mechanism when an average current of at least one of the drive signals DRV 1 and DRV 2 is greater than a pre-determined threshold value.
  • the operation processing controller 240 may make determination and determine whether to start the protection mechanism according to the temperature information transmitted by the compressor driver 220 and the fan driver 230 and the temperature information IFO received by the operation processing controller 240 .
  • the operation processing controller 240 may start the protection mechanism according to the vibration information IF 1 generated by the vibration sensor 250 .
  • the time T 21 , T 22 , and T 23 may occur sequentially.
  • the fuses disposed in the compressor 221 , the fan 231 and, the power supplier 210 may be fused at time T 31 to T 33 respectively in the time interval T 3 when an abnormality phenomenon (overcurrent) occurs, and the protection mechanism is started.
  • the air conditioning device may be effectively prevented from being damaged due to at least one of a plurality of different reasons such as over-temperature, overcurrent, and vibration, and the working appropriateness of the air conditioning device is effectively maintained.
US16/819,179 2019-03-14 2020-03-16 Air conditioning device Abandoned US20200355385A1 (en)

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US16/819,179 US20200355385A1 (en) 2019-03-14 2020-03-16 Air conditioning device

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