WO2019087630A1 - 空調装置 - Google Patents

空調装置 Download PDF

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Publication number
WO2019087630A1
WO2019087630A1 PCT/JP2018/036016 JP2018036016W WO2019087630A1 WO 2019087630 A1 WO2019087630 A1 WO 2019087630A1 JP 2018036016 W JP2018036016 W JP 2018036016W WO 2019087630 A1 WO2019087630 A1 WO 2019087630A1
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WO
WIPO (PCT)
Prior art keywords
compressor
temperature
protection control
operating frequency
target frequency
Prior art date
Application number
PCT/JP2018/036016
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
伊藤　裕
貴裕 仲田
誠司 岡
智春 芦澤
Original Assignee
ダイキン工業株式会社
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 ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Priority to CN201880069422.0A priority Critical patent/CN111279138B/zh
Priority to EP18873146.7A priority patent/EP3705808B1/en
Publication of WO2019087630A1 publication Critical patent/WO2019087630A1/ja

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Classifications

    • 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
    • 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
    • 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
    • F25B49/005—Arrangement or mounting of control or safety devices of 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B2500/06—Damage
    • 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
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0253—Compressor control by controlling speed with variable speed
    • 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
    • F25B2600/00—Control issues
    • F25B2600/07—Remote controls
    • 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
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • 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
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor

Definitions

  • the present disclosure relates to an air conditioner.
  • start-up operation is performed to lower the operating frequency of the compressor for a predetermined time after the compressor is started.
  • liquid return to the compressor does not always occur at the start of the cooling or heating operation. That is, depending on the surrounding environment of the compressor at the start of the cooling or heating operation, the possibility of liquid return to the compressor may be small. Even in such a case, if startup operation is performed to lower the operating frequency of the compressor, the time from when the compressor is started to when the indoor temperature reaches the set temperature becomes longer, and the startup of the cooling or heating operation is made faster. It was difficult.
  • An object of the present disclosure is to provide an air conditioner that can speed up startup of cooling or heating operation.
  • An air conditioner that solves this problem controls a compressor capable of changing the operating frequency and a compressor protection control that raises the operating frequency of the compressor to the required operating frequency at the start of cooling or heating operation. Department and.
  • the compressor protection control has a first protection control and a second protection control.
  • the first protection control controls the operating frequency of the compressor so that the time from when the compressor is started to when the operating frequency reaches the required operating frequency is relatively long.
  • the second protection control controls the operating frequency of the compressor so that the time from when the compressor is started to when the operating frequency reaches the required operating frequency is relatively short.
  • the control unit executes the second protection control when a predetermined condition is satisfied at the time of execution of the compressor protection control.
  • the time from when the compressor is started until the operating frequency of the compressor reaches the required operating frequency Becomes shorter.
  • the predetermined condition is that, by raising the operating frequency of the compressor sharply at the start of the compressor, rare scale progress due to a decrease in oil level in the compressor or refrigerant return, liquid return to the compressor, In the outdoor heat exchanger and the indoor heat exchanger, it is a condition that the possibility of causing problems of the compressor such as freezing of the heat exchanger functioning as an evaporator and negative pressure on the suction side of the compressor is reduced.
  • the control unit sets a first target frequency and a second target frequency which is larger than the first target frequency and smaller than the necessary operating frequency.
  • the control unit maintains the operating frequency at the first target frequency for the first period, and maintains the operating frequency at the second target frequency for the second period to thereby operate the operating frequency of the compressor. Raise gradually.
  • the first target frequency in the second protection control is larger than the first target frequency in the first protection control.
  • the second target frequency in the second protection control is larger than the second target frequency in the first protection control.
  • the time from when the compressor is started by the second protection control to when the operating frequency of the compressor reaches the required operating frequency is shortened. Therefore, the startup of the cooling or heating operation can be made faster.
  • the control unit sets a first target frequency and a second target frequency which is larger than the first target frequency and smaller than the necessary operating frequency.
  • the control unit maintains the operating frequency at the first target frequency for the first period, and maintains the operating frequency at the second target frequency for the second period to thereby operate the operating frequency of the compressor. Raise gradually.
  • the first period in the second protection control is shorter than the first period in the first protection control.
  • the second period in the second protection control is shorter than the second period in the second protection control.
  • the time from when the compressor is started by the second protection control to when the operating frequency of the compressor reaches the required operating frequency is shortened. Therefore, the startup of the cooling or heating operation can be made faster.
  • the predetermined condition at the time of the heating operation is different from the predetermined condition at the time of the cooling operation. According to this configuration, it is possible to appropriately execute the second protection control during the cooling or heating operation.
  • the predetermined condition includes the temperature of indoor air, the temperature of outdoor air, and the temperature difference between the temperature of the indoor air and the temperature of the outdoor air.
  • the predetermined condition at the time of the heating operation is that the temperature of the indoor air is equal to or lower than a room temperature threshold, the temperature of the outdoor air is equal to or higher than an outdoor temperature threshold, and the temperature of the indoor air and the temperature of the outdoor air The temperature difference of is less than or equal to the temperature difference threshold.
  • the temperature of the indoor air and the outdoor air that can be easily acquired as the information of the air conditioner can be a condition that can suppress the occurrence of problems of the compressor such as liquid return to the compressor in the compressor protection control. It can be set using temperature.
  • the predetermined condition includes the temperature of the discharge pipe of the compressor and the temperature of the outdoor air. According to this configuration, it is possible to more appropriately execute the second protection control during the cooling or heating operation.
  • the air conditioner 1 includes a refrigerant circuit 40.
  • the refrigerant circuit 40 includes a refrigerant pipe 30 that circulates the refrigerant between the outdoor unit 10 and the indoor unit 20.
  • the air conditioner 1 of the present embodiment has a refrigerant circuit 40 formed by connecting an outdoor unit 10 installed outdoors and a wall mounted indoor unit 20 mounted on a wall surface etc. of the room by a refrigerant pipe 30. Prepare.
  • the outdoor unit 10 includes a compressor 11 capable of changing the operating frequency, a four-way switching valve 12, an outdoor heat exchanger 13, an expansion valve 14, an outdoor blower 15, an outdoor control device 16, and the like.
  • the outdoor blower 15 has a motor 15a capable of changing the rotational speed as a drive source, and an impeller 15b connected to the output shaft of the motor 15a.
  • An example of the impeller 15b is a propeller fan.
  • the compressor 11 is, for example, a rocking piston type compressor, and includes a compression mechanism, a motor, a crankshaft (both not shown) for transmitting the driving force of the motor to the compression mechanism, and the like.
  • the compressor 11 includes an accumulator 11 a for separating the refrigerant into gas and liquid.
  • An example of the motor is a three-phase brushless motor.
  • the expansion valve 14 is, for example, an electronic expansion valve.
  • the outdoor fan 15 rotates the impeller 15b by the motor 15a in order to promote heat exchange between the refrigerant flowing through the heat transfer pipe of the outdoor heat exchanger 13 and the outdoor air. Thus, the outdoor fan 15 generates an air flow of the outdoor air passing through the outdoor heat exchanger 13.
  • the outdoor control device 16 is electrically connected to the motor of the compressor 11, the four-way switching valve 12, the expansion valve 14, and the motor 15a of the outdoor blower 15.
  • the indoor unit 20 includes an indoor heat exchanger 21, an indoor blower 22, an indoor control device 23, and the like.
  • the indoor blower 22 has a motor 22a capable of changing the rotational speed as a drive source, and an impeller (not shown) connected to the output shaft of the motor 22a.
  • An example of an impeller is a cross flow fan.
  • the indoor blower 22 rotates the impeller with the motor 22a to promote heat exchange between the refrigerant flowing through the heat transfer pipe of the indoor heat exchanger 21 and the indoor air. Thereby, the indoor blower 22 generates an air flow of indoor air passing through the indoor heat exchanger 21.
  • the indoor control device 23 is electrically connected to the motor 22 a of the indoor blower 22.
  • the indoor control device 23 is configured to be capable of wireless communication with, for example, the remote controller 51 (see FIG. 2) of the air conditioner 1 by means of infrared rays or the like.
  • the indoor control device 23 is configured to be able to perform wired communication with the outdoor control device 16 by a signal line. Thereby, the indoor control device 23 controls the indoor unit 20 based on the operation instruction from the remote controller 51, and the outdoor control device 16 controls the outdoor unit 10.
  • the refrigerant circuit 40 is one in which the compressor 11, the four-way switching valve 12, the outdoor heat exchanger 13, the expansion valve 14, and the indoor heat exchanger 21 are annularly connected by a refrigerant pipe 30.
  • the refrigerant circuit 40 can execute a vapor compression refrigeration cycle in which the refrigerant is reversibly circulated by switching the four-way switching valve 12.
  • the four-way switching valve 12 by switching the four-way switching valve 12 to the cooling mode connection state (the state shown by the solid line in the drawing), in the refrigerant circuit 40, the compressor 11, the four-way switching valve 12, the outdoor heat exchanger 13, the expansion valve 14, the room A cooling cycle is formed in which the refrigerant circulates in the order of the heat exchanger 21, the four-way switching valve 12, and the compressor 11.
  • the outdoor heat exchanger 13 is used as a condenser, and the cooling operation is performed in which the indoor heat exchanger 21 functions as an evaporator.
  • the four-way switching valve 12 is switched to the heating mode connection state (state shown by the broken line), whereby the compressor 11, the four-way switching valve 12, the indoor heat exchanger 21, the expansion valve 14, and the outdoor A heating cycle in which the refrigerant circulates in the order of the heat exchanger 13, the four-way switching valve 12, and the compressor 11 is formed.
  • the heating operation is performed in which the indoor heat exchanger 21 functions as a condenser and the outdoor heat exchanger 13 functions as an evaporator.
  • the control unit 50 that controls the air conditioner 1 includes an outdoor control device 16 and an indoor control device 23.
  • Each of the outdoor control device 16 and the indoor control device 23 includes, for example, a processing unit that executes a predetermined control program and a storage unit.
  • the arithmetic processing unit includes, for example, a central processing unit (CPU) or a micro processing unit (MPU).
  • the storage unit stores various control programs and information used for various control processes.
  • the storage unit includes, for example, non-volatile memory and volatile memory.
  • a remote controller 51, an indoor temperature sensor 52, an outdoor temperature sensor 53, and a discharge pipe temperature sensor 54 are communicably connected to the control unit 50. More specifically, the control unit 50 is configured to be capable of wireless communication with the remote controller 51 (see FIG. 3), for example, with infrared rays. That is, signals of the operation instruction of the remote controller 51 (instructions of the cooling operation, the heating operation, etc.) and the operation stop instruction are output to the control unit 50.
  • the indoor temperature sensor 52, the outdoor temperature sensor 53, and the discharge pipe temperature sensor 54 are electrically connected to the control unit 50.
  • the indoor temperature sensor 52 is a sensor for measuring the temperature of the indoor air (indoor temperature), and is provided, for example, in the vicinity of the suction port of the indoor unit 20.
  • the indoor temperature sensor 52 outputs a signal corresponding to the indoor temperature to the control unit 50.
  • the outdoor temperature sensor 53 is a sensor for measuring the temperature of the outdoor air (outdoor temperature), and is provided, for example, near the suction port of the outdoor unit 10.
  • the outdoor temperature sensor 53 outputs a signal corresponding to the outdoor temperature to the control unit 50.
  • the discharge pipe temperature sensor 54 is a sensor for measuring the temperature of the discharge pipe of the compressor 11, that is, the temperature of the discharge gas refrigerant discharged from the compressor 11.
  • the discharge pipe temperature sensor 54 is attached to the discharge pipe of the compressor 11.
  • the discharge pipe temperature sensor 54 outputs a signal corresponding to the temperature of the discharge gas refrigerant of the compressor 11 to the control unit 50.
  • various signals are input to the control unit 50 from the remote controller 51, the indoor temperature sensor 52, the outdoor temperature sensor 53, and the discharge pipe temperature sensor 54. Then, the control unit 50 acquires the indoor temperature (hereinafter, "indoor temperature DA") based on the measurement information of the indoor temperature sensor 52, and the outdoor temperature (hereinafter, “outside air temperature DOA” based on the measurement information of the outdoor temperature sensor 53. And the temperature DF (the temperature of the discharge gas refrigerant) of the discharge pipe of the compressor 11 based on the measurement information of the discharge pipe temperature sensor 54.
  • the indoor control device 23 and the outdoor control device 16 are electrically connected, the operation instruction and the indoor temperature DA received by the indoor control device 23 can be output to the outdoor control device 16. Further, the outside air temperature DOA received by the outdoor control device 16 and the temperature DF of the discharge pipe of the compressor 11 can be output to the indoor control device 23.
  • the indoor control device 23 controls the rotational speed of the motor 22 a of the indoor blower 22 based on the operation instruction of the remote controller 51 and the measurement information.
  • the outdoor control device 16 switches the operating frequency of the compressor 11, switching between the cooling mode connection state and the heating mode connection state of the four-way switching valve 12, and the opening degree of the expansion valve 14 based on the operation instruction and measurement information of the remote controller 51. And the rotational speed of the motor 15a of the outdoor blower 15 is controlled.
  • the control unit 50 performs the cooling operation and the heating operation through the indoor control device 23 and the outdoor control device 16 based on the operation instruction of the remote controller 51 and the measurement information.
  • the control unit 50 controls the compressor 11, the expansion valve 14, the outdoor blower 15, and the indoor blower 22 so that the indoor temperature becomes the temperature set by the remote controller 51 in the cooling operation and the heating operation.
  • the control unit 50 increases the rising speed and the decreasing speed so that the rising speed when raising the operating frequency of the compressor 11 and the decreasing speed when lowering the operating frequency become equal to each other in the cooling operation and the heating operation. It is set.
  • One example of the change speed of the operating frequency of the compressor 11 in the cooling operation and the heating operation, such as the rising speed and the decreasing speed, is 2 Hz per second.
  • the control unit 50 sets the low operating frequency of the compressor 11 to the operating frequency required for the cooling or heating operation (hereinafter referred to as “required operating frequency FN Raise to reach ').
  • the control unit 50 executes compressor protection control at startup of the compressor 11.
  • the operation frequency of the compressor 11 is started at a low operation frequency for the purpose of avoiding the failure of the compressor 11, and the necessary operation frequency necessary for stable operation of the compressor 11 with the passage of time. It is gradually raised until it reaches FN.
  • a graph GX indicated by a broken line in FIG. 3 is a schematic graph for explaining general compressor protection control.
  • the target frequency of the plurality of stages is changed to be maintained for a predetermined time until the operating frequency of the compressor 11 reaches the required operating frequency FN.
  • the controller 50 controls the first target frequency FX1, the second target frequency FX2 higher than the first target frequency FX1, the third target frequency FX3 higher than the second target frequency FX2, and A fourth target frequency FX4 higher than the third target frequency FX3 is stored.
  • the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 becomes the first target frequency FX1 at time t1, and the operating frequency of the compressor 11 is the first target in the period from time t1 to time t3.
  • the compressor 11 is driven to maintain the frequency FX1.
  • the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 changes from the first target frequency FX1 to the second target frequency FX2 at time t3, and during the period from time t3 to time t5, The compressor 11 is driven such that the operating frequency maintains the second target frequency FX2.
  • the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 changes from the second target frequency FX2 to the third target frequency FX3 at time t5, and the controller 11 operates during the period from time t5 to time t6.
  • the compressor 11 is driven so that the operating frequency maintains the third target frequency FX3.
  • the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 changes from the third target frequency FX3 to the fourth target frequency FX4 at time t6, and during the period from time t6 to time t7,
  • the compressor 11 is driven such that the operating frequency maintains the fourth target frequency FX4.
  • the control unit 50 drives the compressor so that the operating frequency of the compressor 11 changes from the fourth target frequency FX4 to the necessary operating frequency FN at time t7.
  • a difference (FX2-FX1) between the second target frequency FX2 and the first target frequency FX1 and a difference (FX3-FX2) between the third target frequency FX3 and the second target frequency FX2 , And the difference (FX4-FX3) between the fourth target frequency FX4 and the third target frequency FX3 are equal to one another.
  • the first period TX1 in which the operating frequency of the compressor 11 maintains the first target frequency FX1 the second period TX2 in which the second target frequency FX2 is maintained, and the third period TX3 in which the third target frequency FX3 is maintained.
  • the fourth period TX4 maintaining the fourth target frequency FX4 are equal to one another.
  • the compressor protection control when the compressor protection control is performed at the start of the cooling or heating operation, the malfunction of the compressor 11 can be avoided, while the operating frequency of the compressor 11 is gradually increased as shown by the graph GX in FIG. Since the user instructs the remote control 51 to perform the cooling or heating operation, it takes a long time for the temperature of the room air to reach the set temperature. That is, startup of the cooling or heating operation at the start of the cooling or heating operation is difficult, and as a result, the cooling capacity or the heating capacity at the start of the cooling or heating operation decreases.
  • the possibility that the malfunction of the compressor 11 may occur may be low depending on the surrounding environment of the compressor 11 (the temperature of the outdoor air or the temperature of the indoor air). Even when the possibility of the occurrence of a failure of the compressor 11 is low, if the compressor protection control shown in the graph GX of FIG. 3 is executed, the cooling ability or the heating ability is low even though the failure of the compressor 11 hardly occurs. The operation of the compressor 11 which is decreasing will be performed.
  • the control unit 50 executes the first start control that changes the control mode of the compressor protection control based on whether the possibility of the occurrence of a failure of the compressor 11 is high or low. Do. Specifically, when there is a high possibility that a malfunction of the compressor 11 will occur, the control unit 50 executes a first protection control that is a compressor protection control as shown in the graph GX of FIG. 3. On the other hand, when there is a low possibility that a malfunction of the compressor 11 will occur, the control unit 50 needs the operating frequency of the compressor 11 more than the compressor protection control (first protection control) shown in the graph GX of FIG. Execute a second protection control that raises FN quickly.
  • the second protection control has a first target frequency FA1 and a second target frequency FA2. That is, the number of target frequencies of the second protection control is smaller than the number of target frequencies of the first protection control.
  • the first target frequency FA1 is larger than the first target frequency FX1 of the first protection control.
  • the first target frequency FA1 of the present embodiment is equal to the second target frequency FX2 of the graph GX.
  • the second target frequency FA2 is larger than the second target frequency FX2 of the first protection control.
  • the second target frequency FA2 of the present embodiment is larger than the fourth target frequency FX4 of the graph GX and smaller than the required operating frequency FN.
  • the first target frequency FA1 and the difference (FA2-FA1) between the second target frequency FA2 and the first target frequency FA1 are equal to one another.
  • the difference (FA2-FA1) between the second target frequency FA2 and the first target frequency FA1 is larger than the difference (FN-FA2) between the required operating frequency FN and the second target frequency FA2.
  • the first period TA1 in which the operating frequency of the compressor 11 maintains the first target frequency FA1 and the second period TA2 in which the operating frequency of the compressor 11 maintains the second target frequency FA2 are equal to each other.
  • the controller 50 After controlling the operating frequency of the compressor 11 to be the first target frequency FA1 in the second protection control, the controller 50 maintains the first target frequency FA1 for a predetermined period of time. To control. Then, the control unit 50 controls the operating frequency of the compressor 11 from the first target frequency FA1 to the second target frequency FA2, and maintains the second target frequency FA2 for a predetermined time. After the control, the operating frequency of the compressor 11 is controlled from the second target frequency FA2 to the required operating frequency FN. In the second protection control, in the first period TA1 in which the operating frequency of the compressor 11 is controlled to maintain the first target frequency FA1, the operating frequency of the compressor 11 in the first protection control maintains the first target frequency FX1. To be controlled to be shorter than the first period TX1. Further, in the second period TA2 in which the operating frequency of the compressor 11 is controlled to maintain the second target frequency FA2, the operating frequency of the compressor 11 in the first protection control is controlled to maintain the second target frequency FX2. It is shorter than the second period TX2.
  • the graph GA of FIG. 3 shows the transition of the operating frequency of the compressor 11 by the second protection control.
  • the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 becomes the first target frequency FA1 at time t1, and during a period from time t1 to time t2 (period TA1)
  • the compressor 11 is driven so that the operating frequency of the compressor 11 maintains the first target frequency FA1.
  • the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 changes from the first target frequency FA1 to the second target frequency FA2 at time t2, and a period from time t2 to time t4 (period TA2)
  • the compressor 11 is driven such that the operating frequency of the compressor 11 maintains the second target frequency FA2.
  • the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 changes from the second target frequency FA2 to the necessary operating frequency FN at time t4.
  • the period TA (period from time t1 to time t4) from when the compressor 11 is started until the operating frequency of the compressor 11 reaches the required operating frequency FN is the first protection control.
  • the period of time from when the compressor 11 starts up to when the operating frequency of the compressor 11 reaches the required operating frequency FN is shorter than the period TX (period from time t1 to time t8).
  • the possibility that the malfunction of the compressor 11 occurs can be estimated using the temperature of the indoor air (indoor temperature) and the temperature of the outdoor air (outdoor temperature). More specifically, the possibility that the failure of the compressor 11 occurs can be estimated based on the indoor temperature DA, the outdoor air temperature DOA, and the temperature difference between the indoor temperature DA and the outdoor air temperature DOA.
  • the temperature conditions in which the possibility of the malfunction of the compressor 11 at the start of the heating operation is low is low and the temperature at which the malfunction of the compressor 11 at the start of the cooling operation is low is low. I found the condition.
  • the room temperature DA when the room temperature DA is high at the start of the heating operation, it is less necessary to increase the room temperature DA promptly, that is, it is less necessary to increase the heating capacity.
  • the room temperature DA when the room temperature DA is low at the start of the cooling operation, it is less necessary to lower the room temperature DA promptly, that is, it is less necessary to increase the cooling capacity.
  • the failure of the compressor 11 when it is not necessary to increase the heating capacity or the cooling capacity, by executing the first protection control as the compressor protection control, the failure of the compressor 11 can be more reliably avoided.
  • FIG. 4 shows the second protection control of the compressor protection control at the start of the heating operation when the present inventors change the room temperature DA, the outside air temperature DOA, and the temperature difference between the room temperature DA and the outside air temperature DOA. It is an example of the result of having tested whether a failure generate
  • the vertical axis in FIG. 4 indicates the room temperature DA, and the horizontal axis indicates the outside air temperature DOA.
  • the diagonal lines in this temperature map indicate the temperature difference between inside and outside that is the temperature difference (DA-DOA) between the room temperature DA and the outside air temperature DOA.
  • the temperature region RL is a temperature region (hereinafter, “temperature region RL”) in which the possibility of occurrence of a failure of the compressor 11 at the start of the heating operation is low and the heating capability needs to be high.
  • the temperature range RL is a temperature range surrounded by the room temperature DA of 20 ° C. or less, the outside air temperature DOA of 0 ° C. or more, and the inside / outside temperature difference X5 or less.
  • An example of the inside and outside temperature difference X5 is 10 ° C. In detail, if the outside air temperature DOA is 0 ° C. or more and the temperature difference between the inside and outside is 10 ° C.
  • the second protection control of the compressor protection control at the start of the heating operation has a defect in the compressor 11 It is unlikely to occur.
  • the outside air temperature DOA is less than 0 ° C., or the temperature difference between inside and outside is more than 10 ° C.
  • a problem occurs in the compressor 11 when the second protection control of the compressor protection control at the start of the heating operation is performed.
  • the room temperature DA is greater than 20 ° C. and the temperature difference between the inside and the outside is 10 ° C. or less
  • the second protection control of the compressor protection control at the start of the heating operation is defective. It is unlikely to occur, but there is no need to increase heating capacity.
  • the inventors of the present invention have a cooling operation in the case of changing the room temperature DA, the outside air temperature DOA, and the temperature difference between the room temperature DA and the outside air temperature DOA as in the heating operation. It was tested whether or not a failure occurred in the compressor 11 when the second protection control of the compressor protection control was performed at the start of the test. Based on such a test, there is a low possibility that a malfunction of the compressor 11 will occur at the start of the cooling or heating operation, and the temperature conditions for which the necessity for increasing the cooling or heating capability is high are as follows.
  • Such temperature conditions in the cooling or heating operation are stored in the control unit 50 as, for example, the map MP1 in the heating operation in FIG. 5 and the map MP2 in the cooling operation in FIG.
  • the indoor temperature DA is equal to or lower than the first judgment temperature (room temperature threshold) DAX1 (DA ⁇ DAX1).
  • the outside air temperature DOA is within the first temperature range (DOAL1 ⁇ DOA ⁇ DOAH1). Note that DOAL1 indicates the lower limit value of the first temperature range, and DOAH1 indicates the upper limit value of the first temperature range.
  • the temperature difference between the room temperature DA and the outside air temperature DOA is equal to or less than the first judgment temperature difference (temperature difference threshold) DDX1 (DA-DOA ⁇ DDX).
  • the first determination temperature DAX1 is a determination value of the indoor temperature that determines whether it is necessary to increase the heating capacity.
  • An example of the first determination temperature DAX1 is 13 ° C.
  • the lower limit value DOAL1 of the first temperature range is a determination value of the outside air temperature that determines whether the possibility of the occurrence of a failure of the compressor 11 at the start of the heating operation is low.
  • One example of the lower limit value DOAL1 is 0 ° C.
  • the upper limit value DOAH1 of the first temperature range is a determination value of the outside air temperature that determines whether it is necessary to increase the heating capacity.
  • An example of the upper limit value DOAH1 is 24 ° C.
  • the first determination temperature difference DDX1 is a determination value of the inside / outside temperature difference which determines whether the possibility of the occurrence of the failure of the compressor 11 at the start of the heating operation is low.
  • An example of the first judgment temperature difference DDX1 is 10 ° C.
  • the indoor temperature DA is equal to or higher than the second judgment temperature (room temperature threshold) DAX2 (DA ⁇ DAX2).
  • the outside air temperature DOA is within the second temperature range (DOAL2 ⁇ DOA ⁇ DOAH2). Note that DOAL2 indicates the lower limit value of the second temperature range, and DOAH2 indicates the upper limit value of the second temperature range.
  • the temperature difference between the indoor temperature DA and the outside air temperature DOA is less than or equal to the second judgment temperature difference (temperature difference threshold) DDX2 (DA-DOA ⁇ DDX2).
  • the second determination temperature DAX2 is a determination value of the indoor temperature that determines whether the cooling capacity needs to be increased.
  • An example of the second determination temperature DAX2 is 25.degree.
  • the lower limit value DOAL2 of the second temperature range is a determination value of the outside air temperature that determines whether the cooling capacity needs to be increased.
  • One example of the lower limit value DOAL2 is 25 ° C.
  • the upper limit value DOAH2 of the second temperature range is a determination value of the outside air temperature that determines whether the possibility of the occurrence of a failure of the compressor 11 at the start of the cooling operation is low.
  • An example of the upper limit value DOAH2 is 45 ° C.
  • the second determination temperature difference DDX2 is a determination value of the inside / outside temperature difference which determines whether the possibility of the occurrence of the failure of the compressor 11 at the start of the cooling operation is low.
  • An example of the second judgment temperature difference DDX2 is -10.degree.
  • the control unit 50 uses the map MP1 to select the first protection control and the second protection control at the start of the heating operation based on the temperature conditions a1, a2 and a3 of the heating operation.
  • the control unit 50 uses the map MP2 to select the first protection control and the second protection control at the start of the cooling operation based on the temperature conditions b1, b2, b3 of the cooling operation.
  • the vertical axis of the map MP1 indicates the room temperature DA, and the horizontal axis indicates the outside air temperature DOA.
  • the inclined line in the map MP1 indicates the boundary condition of the temperature difference between inside and outside.
  • the temperature region R1 satisfying all the temperature conditions a1, a2, and a3 is indicated by hatching. That is, the temperature area R1 is an area for selecting the second protection control, and the area other than the temperature area R1 is an area for selecting the first protection control.
  • the temperature region R1 of the map MP1 may be the same as the temperature region RL of FIG. 4. That is, the first determination temperature DAX1 at temperature conditions a1, a2 and a3 of the heating operation is 20 ° C., the lower limit DOAL1 of the first temperature range is 0 ° C., the upper limit DOAH1 is 30 ° C., and the first determination temperature difference DDX1 is It may be 10 ° C.
  • the vertical axis of the map MP2 indicates the room temperature DA, and the horizontal axis indicates the outside air temperature DOA.
  • the inclined line in the map MP2 indicates the boundary condition of the temperature difference between inside and outside.
  • the temperature region R2 satisfying all the temperature conditions b1, b2, b3 is shown by hatching. That is, the temperature area R2 is an area for selecting the second protection control, and the area other than the temperature area R2 is an area for selecting the first protection control.
  • control unit 50 selects one of the first protection control and the second protection control using the map MP1 at the start of the heating operation, and uses the map MP2 at the start of the cooling operation. And one of the second protection control.
  • Control unit 50 determines whether a heating operation has been instructed in step S11. The determination in step S11 is performed based on, for example, whether or not the control unit 50 has received a heating operation command from the remote controller 51. When it is determined that the heating operation is instructed in step S11 (step S11: YES), the control unit 50 selects the map MP1 in step S12. Then, in step S13, the control unit 50 determines whether the coordinates defined by the room temperature DA and the outside air temperature DOA are within the range of the temperature range R1 in the map MP1.
  • step S14 the second protection control is selected.
  • step S13: NO the controller 50 determines that the coordinates defined by the room temperature DA and the outside air temperature DOA are out of the range of the temperature range R1 (step S13: NO), that is, at least one of the temperature conditions a1 to a3 is satisfied. If it is determined that there is not, the first protection control is selected in step S15.
  • step S11 determines whether the heating operation is not instructed.
  • step S16 determines whether the cooling operation is instructed in step S16.
  • the determination in step S16 is performed based on, for example, whether or not the control unit 50 has received a cooling operation command from the remote controller 51.
  • step S16: YES the control unit 50 selects the map MP2 in step S17.
  • step S18 the control unit 50 determines whether the coordinates defined by the room temperature DA and the outside air temperature DOA are within the range of the temperature region R2 in the map MP2.
  • step S18 determines that the coordinates defined by the room temperature DA and the outside air temperature DOA fall within the range of the temperature range R2 (step S18: YES), that is, if it determines that all the temperature conditions b1 to b3 are satisfied, It transfers to step S14. That is, the control unit 50 selects the second protection control.
  • step S18: NO determines that the coordinates defined by the room temperature DA and the outside air temperature DOA are out of the range of the temperature range R2 (step S18: NO), that is, at least one of the temperature conditions b1 to b3 is satisfied. If it is determined that there is not, the first protection control is selected in step S19.
  • the control unit 50 ends the first start control.
  • the dehumidifying operation may be mentioned as an operation other than the heating operation and the cooling operation.
  • the control unit 50 executes either the first protection control or the second protection control using the map MP1 or the map MP2 during the cooling or heating operation.
  • the compressor 11 in the first protection control starts after the start of the compressor 11.
  • the time required for the operating frequency to reach the required operating frequency FN is shorter.
  • the second protection control by executing the second protection control, the time from when the compressor 11 is started to when the operating frequency of the compressor 11 reaches the required operating frequency FN is shortened.
  • the startup of the cooling or heating operation can be made faster.
  • the time from when the cooling or heating operation is started to when the indoor temperature DA reaches the set temperature can be shortened, the heating capacity or the cooling capacity can be enhanced.
  • the first target frequency FA1 in the second protection control is larger than the first target frequency FX1 in the first protection control
  • the second target frequency FA2 in the second protection control is the second in the first protection control. Greater than the target frequency FX2.
  • the number of target frequencies set until the operating frequency of the compressor 11 reaches the required operating frequency FN after the start of the compressor 11 is the compressor 11 in the first protection control.
  • the operating frequency of the compressor 11 becomes smaller than the number of target frequencies set until the required operating frequency FN is reached after the start of the engine. Therefore, since the time until the operating frequency of the compressor 11 reaches the required operating frequency FN after the compressor 11 is started by the second protection control becomes short, the startup of the cooling or heating operation can be made faster.
  • the operating frequency of the compressor 11 in the first protection control is the first target It is shorter than the first period TX1 controlled to maintain the frequency FX1.
  • the operating frequency of the compressor 11 in the first protection control maintains the second target frequency FX2
  • the second control period is shorter than the second period TX2.
  • the operating frequency of the compressor 11 becomes smaller than the number of target frequencies set until the required operating frequency FN is reached after the start of the engine. Therefore, since the time until the operating frequency of the compressor 11 reaches the required operating frequency FN after the compressor 11 is started by the second protection control becomes short, the startup of the cooling or heating operation can be made faster.
  • the control unit 50 selects one of the first protection control and the second protection control using the map MP1 during the cooling operation, and uses the map MP2 during the heating operation to perform the first protection control and the second protection control. Select one of the protection controls.
  • the condition for executing the second protection control during the cooling operation and the condition for executing the second protection control during the heating operation are different from each other. That is, these conditions are individually set during the cooling operation and the heating operation. Therefore, the control unit 50 can appropriately execute the second protection control during the cooling operation or the heating operation.
  • the conditions for executing the second protection control in the maps MP1 and MP2 are determined by the room temperature DA, the outside air temperature DOA, and the temperature difference between inside and outside. As described above, the conditions for executing the second protection control are set using the indoor temperature sensor 52 and the outdoor temperature sensor 53 provided in the air conditioner 1 as a standard. Therefore, since the indoor temperature DA and the outside air temperature DOA which are easily obtained as information of the air conditioner 1 are used, it is not necessary to provide a dedicated sensor for setting the conditions for executing the second protection control. Therefore, the increase in the cost of the air conditioner 1 can be suppressed.
  • the air conditioner 1 of the present embodiment differs from the air conditioner 1 of the first embodiment in the content of the first activation control.
  • the components of the air conditioner 1 indicate the components of the air conditioner 1 of FIG. 1.
  • the refrigerant When the operation of the air conditioner 1 is stopped, the refrigerant may be condensed and accumulated in the lower one of the temperature of the indoor air and the temperature of the outdoor air.
  • the liquid refrigerant dissolves and accumulates in the lubricating oil in the compressor 11, or the liquid refrigerant accumulates in the outdoor heat exchanger 13, a so-called stagnation phenomenon Will occur.
  • the compressor 11 is started by the heating operation in a state where this stagnation phenomenon occurs, if the rate of increase of the operating frequency of the compressor 11 is increased, oil forming is easily generated in the compressor 11, and the cause of the failure of the compressor 11 It becomes.
  • the compressor 11 when the compressor 11 is started by the cooling operation in the state where the stagnation phenomenon occurs, oil forming is easily generated in the compressor 11 if the speed of increase of the operating frequency of the compressor 11 is increased as in the heating operation.
  • the control unit 50 executes the refrigerant discharge start operation in order to prevent the failure of the compressor 11 at the start of the cooling or heating operation due to the sleeping phenomenon.
  • the control unit 50 reverse cycles the four-way switching valve 12 for a predetermined time (for example, one minute) at the start of the compressor 11 at the start of the heating operation.
  • the compressor 11 is operated while switching to the mode connection state). Thereby, the liquid refrigerant accumulated in the outdoor heat exchanger 13 is caused to flow through the indoor heat exchanger 21.
  • the liquid refrigerant in the indoor heat exchanger 21 is vaporized by the indoor heat exchanger 21 at the time of refrigerant discharge start operation to be a gas refrigerant, and is sucked into the compressor 11. Thereby, the occurrence of oil forming of the compressor 11 can be suppressed. Further, in the refrigerant discharge start operation at the start of the cooling operation, the control unit 50 reverse cycles the four-way switching valve 12 at the start of the compressor 11 at the start of the cooling operation for a predetermined time (for example, one minute) The compressor 11 is operated in the state switched to the heating mode connection state). Thereby, the liquid refrigerant accumulated in the indoor heat exchanger 21 is allowed to flow through the outdoor heat exchanger 13.
  • the liquid refrigerant in the outdoor heat exchanger 13 is evaporated by the outdoor heat exchanger 13 at the time of refrigerant discharge start operation to be a gas refrigerant and sucked into the compressor 11. Thereby, the occurrence of oil forming of the compressor 11 can be suppressed. As described above, when the refrigerant discharge start operation is performed at the start of the cooling or heating operation, the possibility that the malfunction of the compressor 11 occurs is reduced.
  • the control unit 50 executes the second start control of selecting the second protection control after the refrigerant discharge start operation.
  • the processing procedure of the second activation control will be described with reference to FIG.
  • Control unit 50 determines whether or not the refrigerant discharge start operation has been performed in step S21. If the control unit 50 determines that the refrigerant discharge start operation has been performed in step S21 (step S21: YES), the control unit 50 determines whether the refrigerant discharge start operation has been completed in step S22. When it is determined in step S22 that the refrigerant discharge start operation has ended (step S22: YES), the control unit 50 selects the second protection control in step S23. On the other hand, when the control unit 50 determines that the refrigerant discharge start operation has not ended in step S22 (step S22: NO), the control unit 50 shifts to the determination of step S22 again.
  • step S21 when the control unit 50 determines that the refrigerant discharge start operation is not performed in step S21 (step S21: NO), the control unit 50 shifts to the first start control in step S24. Then, the control unit 50 selects one of the first protection control and the second protection control based on the first activation control.
  • the control unit 50 executes the refrigerant discharge start operation
  • the control unit 50 executes the second protection control. After the completion of the refrigerant discharge start operation, the possibility of the occurrence of a failure of the compressor 11 is reduced. Therefore, by executing the second protection control after the refrigerant discharge start operation, the operating frequency of the compressor 11 can be quickly reached to the required operation frequency FN after the refrigerant discharge start operation. Therefore, the startup of the cooling or heating operation can be made faster.
  • each embodiment is an example of a form that the air conditioner according to the present disclosure may take, and is not intended to limit the form.
  • the air conditioning system according to the present disclosure may take a form in which, for example, the following modifications, as well as at least two modifications consistent with each other, are combined, in addition to the above-described embodiments.
  • the control of the compressor 11 when the operating frequency of the compressor 11 in the second protection control is increased to the required operating frequency FN can be arbitrarily changed. That is, in the control, the time until the operating frequency of the compressor 11 in the second protection control reaches the required operating frequency FN, and the time until the operating frequency of the compressor 11 in the first protection control reaches the required operating frequency FN It can be arbitrarily changed under the condition of becoming shorter than the above.
  • the second protection control can be changed, for example, as in the following (A) to (F).
  • the first target frequency FA1 and the second target frequency FA2 can be arbitrarily changed. For example, the first target frequency FA1 may be different from the second target frequency FX2.
  • the first target frequency FA1 may be larger than the second target frequency FX2 and smaller than the third target frequency FX3.
  • the second target frequency FA2 may be equal to the fourth target frequency FX4.
  • the first period TA1 in which the compressor 11 maintains the first target frequency FA1 and the second period TA2 in which the second target frequency FA2 is maintained are equal to the first to fourth periods TX1 to TX4 of the first protection control. Or, it may be longer than the first to fourth periods TX1 to TX4.
  • C The first period TA1 in which the compressor 11 maintains the first target frequency FA1 and the second period TA2 in which the second target frequency FA2 is maintained can be arbitrarily changed.
  • the first period TA1 and the second period TA2 may be different from each other. That is, the first period TA1 and the second period TA2 can be set individually.
  • the number of target frequencies in the second protection control is not limited to two, and can be arbitrarily changed. That is, the number of target frequencies in the second protection control may be one or three or more.
  • the contents of the above (A) to (D) may be combined with each other.
  • the operation frequency of the compressor 11 may be set to the required operation frequency FN at the start of the second protection control. That is, the first target frequency FA1 or the like may be omitted.
  • the control of the compressor 11 may be changed as follows, for example, when raising the operating frequency of the compressor 11 to the required operating frequency FN in the first protection control.
  • Each of the first to fourth target frequencies FX1 to FX4 can be arbitrarily changed.
  • the difference between the second target frequency FX2 and the first target frequency FX1 may be different from the difference between the third target frequency FX3 and the second target frequency FX2.
  • the difference between the fourth target frequency FX4 and the third target frequency FX3 may be different from the difference between the third target frequency FX3 and the second target frequency FX2.
  • Each of the first to fourth periods TX1 to TX4, which is a period in which the compressor 11 maintains each of the first to fourth target frequencies FX1 to FX4, can be arbitrarily changed. For example, some of the first to fourth periods TX1 to TX4 may be different from the rest of the first to fourth periods TX1 to TX4.
  • the number of target frequencies in the first protection control is not limited to four, and can be arbitrarily changed. That is, the number of target frequencies in the first protection control may be three or five or more.
  • the temperature DF of the discharge pipe of the compressor 11 and the outside air temperature DOA may be added to the conditions for selecting the first protection control and the second protection control.
  • the temperature DF of the discharge pipe is equal to or higher than the temperature threshold DFX (DF ⁇ DFX).
  • the outside air temperature DOA is equal to or higher than the determination temperature threshold DOAY (DOA DO DOAY).
  • DOA DO DOAY determination temperature threshold DOAY
  • the temperature difference between the temperature DF of the discharge pipe and the outside air temperature DOA is equal to or greater than the temperature difference threshold DDY (DF-DOAADDY).
  • the temperature threshold DFX is a threshold that limits the conditions for shifting to the maps MP1 and MP2, and is preset by a test or the like.
  • An example of the temperature threshold DFX is -3 ° C.
  • the determination temperature threshold value DOAY is a determination value limiting the conditions for shifting to the maps MP1 and MP2, and is set in advance by a test or the like.
  • An example of the judgment temperature threshold value DOAY is -15.degree.
  • the temperature difference threshold value DDY is a threshold value that limits the conditions for shifting to the maps MP1 and MP2, and is preset by a test or the like.
  • the control unit 50 stores a map MP3 indicating the relationship between the temperature DF of the discharge pipe of the compressor 11 for selecting the first protection control and the second protection control and the outside air temperature DOA.
  • FIG. 9 shows an example of the map MP3.
  • the vertical axis of the map MP3 indicates the temperature DF of the discharge pipe of the compressor 11, and the horizontal axis indicates the outside air temperature DOA.
  • the inclined line in the map MP3 indicates the boundary condition of the temperature difference between the temperature DF of the discharge pipe and the outside air temperature DOA.
  • a temperature region R3 satisfying all of the temperature conditions c1, c2 and c3 is shown in white.
  • control unit 50 determines that the temperature DF of the discharge pipe and the outside air temperature DOA are within temperature range R3 when it is determined that the cooling or heating operation is instructed. It is determined whether or not Specifically, the control unit 50 determines whether the temperature DF of the discharge pipe of the compressor 11 and the outside air temperature DOA are within the temperature range R3.
  • the control unit 50 uses the map MP1 to perform the first protection control and One of the second protection controls is selected, and at the start of the cooling operation, one of the first protection control and the second protection control is selected using the map MP2.
  • the control unit 50 determines that the temperature DF of the discharge pipe and the outside air temperature DOA are in the range other than the temperature range R3, that is, when at least one of the temperature conditions c1, c2, c3 is not satisfied, the first Execute protection control.
  • the second protection control is more appropriate during the cooling or heating operation. Can be performed.
  • the third protection control different from the first protection control and the second protection control is executed as compressor protection control. It is also good.
  • the control unit 50 controls the time until the operating frequency of the compressor 11 reaches the required operating frequency FN, and the operating frequency of the compressor 11 in the first protective control reaches the required operating frequency FN
  • the compressor 11 is controlled so as to be longer than the time period (period TX).
  • the outside air temperature DOA is higher than the determination temperature threshold DOAY and lower than the determination temperature threshold DOAZ (DOAZ> DOAY) higher than the determination temperature threshold DOAY, and the temperature DF of the discharge pipe of the compressor 11 is the temperature threshold DFX.
  • a fourth protection control different from the first protection control and the second protection control may be executed as the compressor protection control.
  • the control unit 50 controls the time until the operating frequency of the compressor 11 reaches the required operating frequency FN, and the operating frequency of the compressor 11 in the first protective control reaches the required operating frequency FN
  • the compressor 11 is controlled such that the operation frequency of the compressor 11 in the third protection control is shorter than the time required to reach the required operation frequency FN, which is longer than the time period (period TX).
  • the compressor protection control is performed in the temperature range R6 where the outside air temperature DOA is equal to or higher than the determination temperature threshold DOAZ and the temperature difference between the discharge pipe temperature DF and the outside air temperature DOA is less than the temperature difference threshold DDY.
  • a fifth protection control different from the first protection control and the second protection control may be executed.
  • the control unit 50 controls the time until the operating frequency of the compressor 11 reaches the required operating frequency FN, and the operating frequency of the compressor 11 in the first protective control reaches the required operating frequency FN.
  • the compressor 11 is controlled such that the operation frequency of the compressor 11 in the fourth protection control is shorter than the time required to reach the required operation frequency FN, which is longer than the time period (period TX).
  • At least one of the temperature condition a1 during the heating operation and the temperature condition b1 during the cooling operation in the first start control may be omitted.
  • either the outdoor control device 16 or the indoor control device 23 may be omitted.
  • the indoor temperature sensor 52 is connected to the outdoor control device 16 by wire or wirelessly.
  • the indoor blower 22 is connected to the outdoor control device 16 by wire.
  • the outdoor control device 16 corresponds to a control unit.
PCT/JP2018/036016 2017-10-30 2018-09-27 空調装置 WO2019087630A1 (ja)

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CN111279138A (zh) 2020-06-12
JP2019082279A (ja) 2019-05-30
EP3705808A1 (en) 2020-09-09
CN111279138B (zh) 2021-06-11
JP6601472B2 (ja) 2019-11-06
EP3705808B1 (en) 2022-08-03
EP3705808A4 (en) 2020-11-18

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