EP3705808B1 - Climatiseur - Google Patents

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Publication number
EP3705808B1
EP3705808B1 EP18873146.7A EP18873146A EP3705808B1 EP 3705808 B1 EP3705808 B1 EP 3705808B1 EP 18873146 A EP18873146 A EP 18873146A EP 3705808 B1 EP3705808 B1 EP 3705808B1
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EP
European Patent Office
Prior art keywords
compressor
protection control
operating frequency
temperature
target frequency
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.)
Active
Application number
EP18873146.7A
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German (de)
English (en)
Other versions
EP3705808A4 (fr
EP3705808A1 (fr
Inventor
Hiroshi Itou
Takahiro Nakata
Seiji Oka
Tomoharu ASHIZAWA
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.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
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Publication date
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Publication of EP3705808A4 publication Critical patent/EP3705808A4/fr
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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.
  • a typical air conditioner When starting a cooling or heating operation, a typical air conditioner performs an activation operation that lowers the operating frequency of a compressor for a predetermined time from when the compressor is activated in order to prevent backflow of liquid to the compressor (for example, refer to JP 6-341720 A ).
  • Examples for air conditioners that comprise a compressor and a control unit that is configured to execute a first and second compressor protection control are derivable from JP H04 268164 A , JP 2014 047935 A and US 2011/113797 A1 .
  • Examples for air conditioners further comprising a four-way switching valve are derivable from JP WO20 1514 0871 A1 , JP S63 150258 U , JP H01 305267 A , JP H07 310959 A and JP H09 119693 A . These latter reveal an air conditioner according to the preamble of claim 1.
  • the liquid backflow to the compressor does not always occur. More specifically, the probability of occurrence of the liquid backflow to the compressor may be low depending on the surrounding environment of the compressor at a time of starting the cooling or heating operation.
  • the activation operation that lowers the operating frequency of the compressor is performed even in such a case, the time from when the compressor is activated to when the room temperature reaches the set temperature extends. This hinders a quick startup of the cooling or heating operation.
  • This configuration shortens the time from when the compressor 11 is activated to when the operating frequency of the compressor 11 reaches the necessary operating frequency FN. As a result, the time from when the cooling or heating operation is started to when the room temperature DA reaches the set temperature is shortened, and the cooling or heating operation starts up quickly.
  • the condition for activating the second protection control refers to a condition that lowers the probability of occurrence of problems with the compressor caused by sudden increases in the operating frequency of the compressor when activated, such as a rise in the degree of dilution caused by a lowered surface of oil in the compressor or a returned refrigerant, backflow of liquid to the compressor, freezing of the outdoor heat exchanger and the indoor heat exchanger used as evaporators, and negative pressure of the suction side of the compressor.
  • the air conditioner 1 includes a refrigerant circuit 40.
  • the refrigerant circuit 40 includes a refrigerant pipe 30 that circulates a refrigerant between an outdoor unit 10 and an indoor unit 20.
  • the air conditioner 1 of the present embodiment that does not form part of the present invention includes the refrigerant circuit 40 formed by connecting the refrigerant pipe 30 to the outdoor unit 10, which is installed outdoors, and the indoor unit 20, which is a wall-installation type and is installed on an indoor wall surface or the like.
  • the outdoor unit 10 includes, for example, a compressor 11 in which the operating frequency is changeable, a four-way switching valve 12, an outdoor heat exchanger 13, an expansion valve 14, an outdoor fan 15, and an outdoor controller 16.
  • the outdoor fan 15 includes a motor 15a and an impeller 15b connected to the output shaft of the motor 15a.
  • the motor 15a is a drive source having a changeable rotational speed.
  • An example of the impeller 15b is a propeller fan.
  • the compressor 11 is, for example, a rocking piston compressor and includes, for example, a compression mechanism, a motor, and a crankshaft that transmits driving power of the motor to the compression mechanism (none shown).
  • the compressor 11 includes an accumulator 11a that separates 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 using the motor 15a to facilitate heat exchange between the outdoor air and the refrigerant flowing through a heat transfer tube of the outdoor heat exchanger 13. Thus, the outdoor fan 15 generates a flow of outdoor air that passes through the outdoor heat exchanger 13.
  • the outdoor controller 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 fan 15.
  • the indoor unit 20 includes, for example, an indoor heat exchanger 21, an indoor fan 22, and an indoor controller 23.
  • the indoor fan 22 includes a motor 22a and an impeller (not shown) connected to the output shaft of the motor 22a.
  • the motor 22a is a drive source having a changeable rotational speed.
  • An example of the impeller is a crossflow fan.
  • the indoor fan 22 rotates the impeller using the motor 22a to facilitate heat exchange between the indoor air and the refrigerant flowing through a heat transfer tube of the indoor heat exchanger 21.
  • the indoor controller 23 is electrically connected to the motor 22a of the indoor fan 22.
  • the indoor controller 23 is, for example, configured to perform wireless communication with a remote controller 51 (refer to Fig. 2 ) of the air conditioner 1 using infrared light or the like.
  • the indoor controller 23 is configured to perform wired communication with the outdoor controller 16 through a signal line.
  • the indoor controller 23 controls the indoor unit 20, and the outdoor controller 16 controls the outdoor unit 10 based on an operating instruction of the remote controller 51.
  • the refrigerant circuit 40 is configured by connecting the compressor 11, the four-way switching valve 12, the outdoor heat exchanger 13, the expansion valve 14, and the indoor heat exchanger 21 with the refrigerant pipe 30 as a loop.
  • the refrigerant circuit 40 is configured to execute a vapor compression refrigeration cycle that reversibly circulates the refrigerant by switching the four-way switching valve 12.
  • the refrigerant circuit 40 forms a cooling cycle in which the refrigerant circulates in the order of the compressor 11, the four-way switching valve 12, the outdoor heat exchanger 13, the expansion valve 14, the indoor heat exchanger 21, the four-way switching valve 12, and the compressor 11.
  • the air conditioner 1 performs the cooling operation in which the outdoor heat exchanger 13 acts as a condenser and the indoor heat exchanger 21 acts as an evaporator.
  • the refrigerant circuit 40 forms a heating cycle in which the refrigerant circulates in the order of the compressor 11, the four-way switching valve 12, the indoor heat exchanger 21, the expansion valve 14, the outdoor heat exchanger 13, the four-way switching valve 12, and the compressor 11.
  • the air conditioner 1 performs the heating operation in which the indoor heat exchanger 21 acts as a condenser and the outdoor heat exchanger 13 acts as an evaporator.
  • a control unit 50 that controls the air conditioner 1 includes the outdoor controller 16 and the indoor controller 23.
  • Each of the outdoor controller 16 and the indoor controller 23 includes, for example, a storage device and an arithmetic processing device that executes a predetermined control program.
  • the arithmetic processing device 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 device includes, for example, a nonvolatile memory and a volatile memory.
  • the control unit 50 is connected to the remote controller 51, an indoor temperature sensor 52, an outdoor temperature sensor 53, and a discharge pipe temperature sensor 54 so that communication is performed.
  • control unit 50 is configured to perform wireless communication with the remote controller 51 (refer to Fig. 3 ) using, for example, infrared light. More specifically, the remote controller 51 transmits signals of an operating instruction (instruction to perform cooling operation, heating operation, etc.) and a deactivating instruction 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 used to measure the indoor air temperature (room temperature) and is disposed, for example, in the vicinity of an inlet of the indoor unit 20.
  • the indoor temperature sensor 52 transmits a signal corresponding to the room temperature to the control unit 50.
  • the outdoor temperature sensor 53 is used to measure the outdoor air temperature (outdoor temperature) and is disposed, for example, in the vicinity of an inlet of the outdoor unit 10.
  • the outdoor temperature sensor 53 transmits a signal corresponding to the outdoor temperature to the control unit 50.
  • the discharge pipe temperature sensor 54 is used to measure the temperature of a discharge pipe of the compressor 11, that is, the temperature of a discharged 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 transmits a signal corresponding to the temperature of the gas refrigerant discharged from the compressor 11 to the control unit 50.
  • the control unit 50 receives various signals (operating instruction and measurement information) from the remote controller 51, the indoor temperature sensor 52, the outdoor temperature sensor 53, and the discharge pipe temperature sensor 54.
  • the control unit 50 obtains the room temperature (hereafter, referred to as "room temperature DA") based on measurement information of the indoor temperature sensor 52, obtains the outdoor temperature (hereafter, referred to as "ambient temperature DOA”) based on measurement information of the outdoor temperature sensor 53, and obtains a temperature DF of the discharge pipe of the compressor 11 (temperature of discharged gas refrigerant) based on measurement information of the discharge pipe temperature sensor 54.
  • room temperature DA room temperature
  • ambient temperature DOA outdoor temperature
  • a temperature DF of the discharge pipe of the compressor 11 temperature of discharged gas refrigerant
  • the indoor controller 23 Since the indoor controller 23 is electrically connected to the outdoor controller 16, the operating instruction and the room temperature DA, which are received by the indoor controller 23, may be transmitted to the outdoor controller 16. Also, the ambient temperature DOA and the temperature DF of the discharge pipe of the compressor 11, which are received by the outdoor controller 16, may be transmitted to the indoor controller 23.
  • the indoor controller 23 controls the rotational speed of the motor 22a of the indoor fan 22 based on an operating instruction of the remote controller 51 and measurement information.
  • the outdoor controller 16 controls the operating frequency of the compressor 11, the switching of the four-way switching valve 12 between the cooling mode connection state and the heating mode connection state, the opening degree of the expansion valve 14, and the rotational speed of the motor 15a of the outdoor fan 15 based on an operating instruction of the remote controller 51 and measurement information.
  • the control unit 50 executes the cooling operation and the heating operation through the indoor controller 23 and the outdoor controller 16 based on an operating instruction of the remote controller 51 and measurement information. In the cooling operation and the heating operation, the control unit 50 controls the compressor 11, the expansion valve 14, the outdoor fan 15, and the indoor fan 22 so that the indoor temperature reaches the temperature set by the remote controller 51.
  • the control unit 50 sets an increase rate at which the operating frequency of the compressor 11 is increased and a decrease rate at which the operating frequency is decreased so that the increase rate is equal to the decrease rate.
  • An example of the increase rate and the decrease rate, which are change rates of the operating frequency of the compressor 11 in the cooling operation and the heating operation, is 2 Hz per second.
  • the control unit 50 when activating the compressor 11 to start the cooling or heating operation, the control unit 50 increases the low operating frequency of the compressor 11 to an operating frequency necessary for the cooling or heating operation (hereafter, referred to as "necessary operating frequency FN"). In this case, the control unit 50 executes a compressor protection control when activating the compressor 11.
  • the compressor protection control in order to prevent problems with the compressor 11, the operating frequency of the compressor 11 is low at the beginning and is increased in a stepped manner as time elapses to the necessary operating frequency FN, at which the compressor 11 stably operates.
  • Examples of problems with the compressor 11 caused by sudden increases in the operating frequency of the compressor 11 when activated include a rise in the degree of dilution caused by a lowered surface of oil in the compressor 11 or a returned refrigerant, backflow of liquid to the compressor 11, freezing of the outdoor heat exchanger 13 and the indoor heat exchanger 21 used as evaporators, and negative pressure of the suction side of the compressor 11.
  • Graph GX indicated by the broken line in Fig. 3 is a schematic graph showing a typical compressor protection control.
  • the operating frequency of the compressor 11 is changed so that the operating frequency is maintained at multistage target frequencies for a predetermined time before reaching the necessary operating frequency FN. More specifically, in the compressor protection control, the control unit 50 stores a first target frequency FX1, a second target frequency FX2 that is greater than the first target frequency FX1, a third target frequency FX3 that is greater than the second target frequency FX2, and a fourth target frequency FX4 that is greater than the third target frequency FX3. At time t1, the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 reaches the first target frequency FX1.
  • the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 is maintained at the first target 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.
  • the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 is maintained at 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.
  • the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 is maintained at 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. From time t6 to time t7, the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 is maintained at the fourth target frequency FX4. At time t7, 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.
  • the difference (FX2-FX1) between the second target frequency FX2 and the first target frequency FX1, the 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 each other.
  • a second period TX2 during which the second target frequency FX2 is maintained and a third period TX3 during which the third target frequency FX3 is maintained
  • a fourth period TX4 during which the fourth target frequency FX4 is maintained are equal to each other.
  • the probability of occurrence of problems with the compressor 11 may be low depending on the surrounding environment (outdoor air temperature and indoor air temperature) of the compressor 11.
  • the probability of occurrence of problems with the compressor 11 is low, if the compressor protection control indicated by graph GX shown in Fig. 3 is executed, the compressor 11 is operated with a low cooling performance or a low heating performance even though problems with the compressor 11 is not likely to occur.
  • the control unit 50 executes a first activation control that changes the mode of the compressor protection control based on whether the probability of occurrence of problems with the compressor 11 is high or low. More specifically, when the probability of occurrence of problems with the compressor 11 is high, the control unit 50 executes a first protection control, that is, the compressor protection control indicated by graph GX shown in Fig. 3 . When the probability of occurrence of problems with the compressor 11 is low, the control unit 50 executes a second protection control. The second protection control increases the operating frequency of the compressor 11 to the necessary operating frequency FN more quickly than the compressor protection control (first protection control) indicated by graph GX shown in Fig. 3 .
  • 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 less than the number of target frequencies of the first protection control.
  • the first target frequency FA1 is greater than the first target frequency FX1 of the first protection control.
  • the first target frequency FA1 is equal to the second target frequency FX2 of graph GX.
  • the second target frequency FA2 is greater than the second target frequency FX2 of the first protection control.
  • the second target frequency FA2 is greater than the fourth target frequency FX4 of graph GX and is less than the necessary operating frequency FN.
  • the first target frequency FA1 is equal to the difference (FA2-FA1) between the second target frequency FA2 and the first target frequency FA1.
  • the difference (FA2-FA1) between the second target frequency FA2 and the first target frequency FA1 is greater than the difference (FN-FA2) between the necessary operating frequency FN and the second target frequency FA2.
  • a first period TA1 during which the operating frequency of the compressor 11 is maintained at the first target frequency FA1 is equal to a second period TA2 during which the operating frequency of the compressor 11 is maintained at the second target frequency FA2.
  • the control unit 50 controls the operating frequency of the compressor 11 to be maintained at the first target frequency FA1 for a predetermined time. Subsequently, the control unit 50 controls the operating frequency of the compressor 11 to change from the first target frequency FA1 to the second target frequency FA2. After controlling the operating frequency of the compressor 11 to be maintained at the second target frequency FA2 for a predetermined time, the control unit 50 controls the operating frequency of the compressor 11 to change from the second target frequency FA2 to the necessary operating frequency FN.
  • the first period TA1 in which the operating frequency of the compressor 11 is controlled to be maintained at the first target frequency FA1 in the second protection control, is shorter than the first period TX1, in which the operating frequency of the compressor 11 is controlled to be maintained at the first target frequency FX1 in the first protection control.
  • Graph GA shown in Fig. 3 shows changes in the operating frequency of the compressor 11 in the second protection control.
  • the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 reaches the first target frequency FA1.
  • the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 is maintained at 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.
  • time t2 to time t4 (during the period TA2), the control unit 50 drives the compressor 11 so that the operating frequency of the compressor 11 is maintained at 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.
  • a period TA (from time t1 to time t4) from when the compressor 11 is activated to when the operating frequency of the compressor 11 reaches the necessary operating frequency FN in the second protection control is shorter than a period TX (from time t1 to time t8) from when the compressor 11 is activated to when the operating frequency of the compressor 11 reaches the necessary operating frequency FN in the first protection control.
  • the probability of occurrence of problems with the compressor 11 may be estimated using the indoor air temperature (room temperature) and the outdoor air temperature (outdoor temperature). More specifically, the probability of occurrence of problems with the compressor 11 may be estimated based on the room temperature DA, the ambient temperature DOA, and the difference in temperature between the room temperature DA and the ambient temperature DOA.
  • a temperature condition under which the probability of occurrence of problems with the compressor 11 is low when starting the heating operation, and a temperature condition under which the probability of occurrence of problems with the compressor 11 is low when starting the cooling operation are found through tests conducted by the inventors of the present application.
  • the first protection control is executed as the compressor protection control, so that problems with the compressor 11 are more assuredly avoided.
  • Fig. 4 is an example of results of tests conducted by the inventors of the present application to determine whether problems with the compressor 11 occur when the second protection control of the compressor protection control is executed at the time of starting the heating operation, with changes in the room temperature DA, the ambient temperature DOA, and the difference in temperature between the room temperature DA and the ambient temperature DOA.
  • the vertical axis indicates the room temperature DA
  • the horizontal axis indicates the ambient temperature DOA.
  • diagonal lines indicate indoor-outdoor temperature differences, that is, differences (DA-DOA) in temperature between the room temperature DA and the ambient temperature DOA.
  • DA-DOA differences
  • the shaded section indicates an example of a temperature region (hereafter, referred to as "temperature region RL") in which when starting the heating operation, the probability of occurrence of problems with the compressor 11 is low and the need for increasing the heating performance is high.
  • the temperature region RL is surrounded by conditions of the room temperature DA being less than or equal to 20°C, the ambient temperature DOA being greater than or equal to 0°C, and the indoor-outdoor temperature difference being less than or equal to X5.
  • An example of the indoor-outdoor temperature difference X5 is 10°C.
  • the second protection control of the compressor protection control is executed at the time of starting the heating operation, the probability of occurrence of problems with the compressor 11 is low.
  • the ambient temperature DOA is less than 0°C or the indoor-outdoor temperature difference is greater than 10°C, if the second protection control of the compressor protection control is executed at the time of starting the heating operation, the probability of occurrence of problems with the compressor 11 is high.
  • the second protection control of the compressor protection control is executed at the time of starting the heating operation, the probability of occurrence of problems with the compressor 11 is low. However, the heating performance does not need to be increased.
  • the inventors of the present application conducted tests to determine whether problems with the compressor 11 occur when the second protection control of the compressor protection control is executed at the time of starting the cooling operation, with changes in the room temperature DA, the ambient temperature DOA, and the difference in temperature between the room temperature DA and the ambient temperature DOA. Temperature conditions under which when starting the cooling or heating operation, the probability of occurrence of problems with the compressor 11 is low, and the need for increasing the cooling or heating performance is high are determined based on these tests and described below. Such temperature conditions of the cooling or heating operation are stored in the control unit 50, for example, as a map MP1 shown in Fig. 5 for the heating operation and a map MP2 shown in Fig. 6 for the cooling operation.
  • the room temperature DA is less than or equal to a first determination temperature DAX1 (room temperature threshold value) (DA ⁇ DAX1).
  • the ambient temperature DOA is in a first temperature range (DOAL1 ⁇ DOA ⁇ DOAH1).
  • DOAL1 denotes the lower limit value of the first temperature range
  • DOAH1 denotes the upper limit value of the first temperature range.
  • the difference in temperature between the room temperature DA and the ambient temperature DOA is less than or equal to a first determination temperature difference DDX1 (temperature difference threshold value) (DA-DOA ⁇ DDX).
  • the first determination temperature DAX1 is a determination value of the room temperature that determines whether the heating performance needs to be increased.
  • 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 ambient temperature that determines whether the probability of occurrence of problems with the compressor 11 is low when starting the heating operation.
  • An 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 ambient temperature that determines whether the heating performance needs to be increased.
  • An example of the upper limit value DOAH1 is 24°C.
  • the first determination temperature difference DDX1 is a determination value of the indoor-outdoor temperature difference that determines whether the probability of occurrence of problems with the compressor 11 is low when starting the heating operation.
  • An example of the first determination temperature difference DDX1 is 10°C.
  • the room temperature DA is greater than or equal to a second determination temperature DAX2 (room temperature threshold value) (DA ⁇ DAX2).
  • the ambient temperature DOA is in a second temperature range (DOAL2 ⁇ DOA ⁇ DOAH2).
  • DOAL2 denotes the lower limit value of the second temperature range
  • DOAH2 denotes the upper limit value of the second temperature range.
  • the difference in temperature between the room temperature DA and the ambient temperature DOA is less than or equal to a second determination temperature difference DDX2 (temperature difference threshold value) (DA-DOA ⁇ DDX2).
  • the second determination temperature DAX2 is a determination value of the room temperature that determines whether the cooling performance needs to be increased.
  • An example of the second determination temperature DAX2 is 25°C.
  • the lower limit value DOAL2 of the second temperature range is a determination value of the ambient temperature that determines whether the cooling performance needs to be increased.
  • An 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 ambient temperature that determines whether the probability of occurrence of problems with the compressor 11 is low when starting the cooling operation.
  • An example of the upper limit value DOAH2 is 45°C.
  • the second determination temperature difference DDX2 is a determination value of the indoor-outdoor temperature difference that determines whether the probability of occurrence of problems with the compressor 11 is low when starting the cooling operation.
  • An example of the second determination temperature difference DDX2 is -10°C.
  • the control unit 50 uses the map MP1 to select the first protection control and the second protection control when starting 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 when starting the cooling operation based on the temperature conditions b1, b2, and b3 of the cooling operation.
  • the vertical axis indicates the room temperature DA
  • the horizontal axis indicates the ambient temperature DOA.
  • the diagonal line indicates a boundary condition of the indoor-outdoor temperature difference.
  • the shading indicates a temperature region R1 in which all of the temperature conditions a1, a2, and a3 are satisfied. More specifically, the second protection control is selected in the temperature region R1, and the first protection control is selected in a region excluding the temperature region R1.
  • the temperature region R1 of the map MP1 may be the same as the temperature region RL shown in Fig. 4 . More specifically, in the temperature conditions a1, a2, and a3 of the heating operation, the first determination temperature DAX1 may be 20°C, the lower limit value DOAL1 of the first temperature range may be 0°C, the upper limit value DOAH1 may be 30°C, and the first determination temperature difference DDX1 may be 10°C.
  • the vertical axis indicates the room temperature DA
  • the horizontal axis indicates the ambient temperature DOA.
  • the diagonal line indicates a boundary condition of the indoor-outdoor temperature difference.
  • the shading indicates a temperature region R2 in which all of the temperature conditions b1, b2, and b3 are satisfied. More specifically, the second protection control is selected in the temperature region R2, and the first protection control is selected in a region excluding the temperature region R2.
  • control unit 50 uses the map MP1 to select one of the first protection control and the second protection control when starting the heating operation, and uses the map MP2 to select one of the first protection control and the second protection control when starting the cooling operation.
  • step S11 the control unit 50 determines whether the heating operation is instructed to be performed. The determination of step S11 is made, for example, based on whether the control unit 50 receives an instruction to perform the heating operation from the remote controller 51.
  • step S11 the control unit 50 selects the map MP1 in step S12.
  • step S13 the control unit 50 determines whether the coordinates specified by the room temperature DA and the ambient temperature DOA are in the range of the temperature region R1 in the map MP1.
  • step S13: YES When determining that the coordinates specified by the room temperature DA and the ambient temperature DOA are in the range of the temperature region R1 (step S13: YES), that is, when determining that all of the temperature conditions a1 to a3 are satisfied, the control unit 50 selects the second protection control in step S14.
  • step S13: NO When determining that the coordinates specified by the room temperature DA and the ambient temperature DOA are outside the range of the temperature region R1 (step S13: NO), that is, when determining that at least one of the temperature conditions a1 to a3 is not satisfied, the control unit 50 selects the first protection control in step S15.
  • step S11 When determining in step S11 that the heating operation is not instructed to be performed (step S11: NO), the control unit 50 determines in step S16 whether the cooling operation is instructed to be performed. The determination of step S16 is made, for example, based on whether the control unit 50 receives an instruction to perform the cooling operation from the remote controller 51. When determining in step S16 that the cooling operation is instructed to be performed (step S16: YES), the control unit 50 selects the map MP2 in step S17. In step S18, the control unit 50 determines whether the coordinates specified by the room temperature DA and the ambient temperature DOA are in the range of the temperature region R2 in the map MP2.
  • step S18: YES When determining that the coordinates specified by the room temperature DA and the ambient temperature DOA are in the range of the temperature region R2 (step S18: YES), that is, when determining that all of the temperature conditions b1 to b3 are satisfied, the control unit 50 proceeds to step S14. That is, the control unit 50 selects the second protection control.
  • step S18: NO When determining that the coordinates specified by the room temperature DA and the ambient temperature DOA are outside the range of the temperature region R2 (step S18: NO), that is, when determining that at least one of the temperature conditions b1 to b3 is not satisfied, the control unit 50 selects the first protection control in step S19.
  • step S16 When determining in step S16 that the cooling operation is not instructed to be performed, the control unit 50 terminates the first activation control.
  • a dehumidifying operation is an example of an operation other than the heating operation and the cooling operation.
  • FIG. 1 A second embodiment of an air conditioner 1 that falls within the scope of the invention will now be described with reference to Figs. 1 and 8 .
  • the air conditioner 1 of the present embodiment differs from the air conditioner 1 of the first embodiment in the first activation control.
  • components of the air conditioner 1 refer to the components of the air conditioner 1 shown in Fig. 1 .
  • the refrigerant may condense and accumulate at a side corresponding to the lower one of the indoor air temperature and the outdoor air temperature.
  • a stagnation phenomenon is generated, that is, the liquid refrigerant dissolves and accumulates in the lubricant oil of the compressor 11 or the liquid refrigerant accumulates in the outdoor heat exchanger 13.
  • the stagnation phenomenon is generated and the compressor 11 is activated in the heating operation, if the increase rate of the operating frequency of the compressor 11 is increased, generation of oil foaming in the compressor 11 is facilitated. This causes a failure of the compressor 11.
  • the stagnation phenomenon is generated and the compressor 11 is activated in the cooling operation, if the increase rate of the operating frequency of the compressor 11 is increased, generation of oil foaming in the compressor 11 is facilitated in the same manner as in the heating operation.
  • the control unit 50 executes a refrigerant discharge activation operation to avoid a failure of the compressor 11 caused by the stagnation phenomenon when starting the cooling or heating operation.
  • the control unit 50 operates the compressor 11 with the four-way switching valve 12 switched to the reverse cycle (cooling mode connection state) for a predetermined time (e.g., one minute). This allows the liquid refrigerant accumulated in the outdoor heat exchanger 13 to flow to the indoor heat exchanger 21.
  • the liquid refrigerant in the indoor heat exchanger 21 is evaporated by the indoor heat exchanger 21 and becomes gas refrigerant.
  • the gas refrigerant is drawn into the compressor 11. This limits generation of oil foaming in the compressor 11.
  • the control unit 50 operates the compressor 11 with the four-way switching valve 12 switched to the reverse cycle (heating mode connection state) for a predetermined time (e.g., one minute). This allows the liquid refrigerant accumulated in the indoor heat exchanger 21 to flow to the outdoor heat exchanger 13.
  • the liquid refrigerant in the outdoor heat exchanger 13 is evaporated by the outdoor heat exchanger 13 and becomes gas refrigerant.
  • the gas refrigerant is drawn into the compressor 11. This limits generation of oil foaming in the compressor 11.
  • the probability of occurrence of problems with the compressor 11 is lowered.
  • the control unit 50 executes a second activation control that selects the second protection control after the refrigerant discharge activation operation.
  • the procedures of the second activation control will now be described with reference to Fig. 8 .
  • step S21 the control unit 50 determines whether the refrigerant discharge activation operation is performed.
  • step S21: YES determines in step S22 whether the refrigerant discharge activation operation is completed.
  • step S22: YES determines in step S22 whether the refrigerant discharge activation operation is completed.
  • step S22: NO determines in step S22 that the refrigerant discharge activation operation is not completed.
  • step S21 When determining in step S21 that the refrigerant discharge activation operation is not performed (step S21: NO), the control unit 50 proceeds to the first activation control in step S24.
  • the control unit 50 selects one of the first protection control and the second protection control based on the first activation control.
  • the present embodiment has the following advantages.
  • the control unit 50 executes the second protection control.
  • the probability of occurrence of problems with the compressor 11 is lowered.
  • Execution of the second protection control after the refrigerant discharge activation operation allows the operating frequency of the compressor 11 to reach the necessary operating frequency FN quickly after the refrigerant discharge activation operation. Thus, the cooling or heating operation starts up quickly.
  • the control executed on the compressor 11 to increase the operating frequency of the compressor 11 to the necessary operating frequency FN in the second protection control may be changed in any manner. More specifically, the control may be changed in any manner on condition that the time for the operating frequency of the compressor 11 to reach the necessary operating frequency FN in the second protection control is shorter than the time for the operating frequency of the compressor 11 to reach the necessary operating frequency FN in the first protection control.
  • the second protection control may be changed, for example, as described below in (A) to (F).
  • the first target frequency FA1 and the second target frequency FA2 may be changed in any manner. For example, the first target frequency FA1 and the second target frequency FX2 may have different values.
  • the value of the first target frequency FA1 may be greater than the value of the second target frequency FX2 and less than the value of the third target frequency FX3.
  • the second target frequency FA2 may be equal to the fourth target frequency FX4.
  • the first period TA1 and the second period TA2, during which the compressor 11 respectively maintains the first target frequency FA1 and the second target frequency FA2 may be longer than or equal to the first to fourth periods TX1 to TX4 of the first protection control.
  • the first period TA1 and the second period TA2, during which the compressor 11 respectively maintains the first target frequency FA1 and the second target frequency FA2, may be changed in any manner.
  • the first period TA1 may differ from the second period TA2.
  • the first period TA1 and the second period TA2 may be separately set.
  • the number of target frequencies in the second protection control is not limited to two and may be changed in any manner. That is, the number of target frequencies in the second protection control may be one or three or greater.
  • the modifications (A) to (D) may be combined with one another.
  • the operating frequency of the compressor 11 may be set to the necessary operating frequency FN. That is, the target frequencies such as the first target frequency FA1 may be omitted.
  • the control executed on the compressor 11 to increase the operating frequency of the compressor 11 to the necessary operating frequency FN in the first protection control may be changed, for example, as follows.
  • Each of the first to fourth target frequencies FX1 to FX4 may be changed in any manner.
  • the difference between the second target frequency FX2 and the first target frequency FX1 may differ 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 differ from the difference between the third target frequency FX3 and the second target frequency FX2.
  • the first to fourth periods TX1 to TX4, during which the compressor 11 respectively maintains the first to fourth target frequencies FX1 to FX4 may be changed in any manner.
  • some of the first to fourth periods TX1 to TX4 may differ 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 may be changed in any manner. That is, the number of target frequencies in the first protection control may be three or five or greater.
  • the temperature DF of the discharge pipe of the compressor 11 and the ambient 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 greater than or equal to a temperature threshold value DFX (DF ⁇ DFX).
  • the ambient temperature DOA is greater than or equal to a determination temperature threshold value DOAY (DOA ⁇ DOAY).
  • DOA ⁇ DOAY determination temperature threshold value
  • the difference in temperature between the temperature DF of the discharge pipe and the ambient temperature DOA is greater than or equal to the temperature difference threshold value DDY (DF-DOA ⁇ DDY).
  • the temperature threshold value DFX is a threshold value that limits the condition for proceeding to the maps MP1 and MP2 and is set in advance through tests or the like.
  • An example of the temperature threshold value DFX is -3°C.
  • the determination temperature threshold value DOAY is a determination value that limits the condition for proceeding to the maps MP1 and MP2 and is set in advance through tests or the like.
  • An example of the determination temperature threshold value DOAY is -15°C.
  • the temperature difference threshold value DDY is a threshold value that limits the condition for proceeding to the maps MP1 and MP2 and is set in advance through tests or the like.
  • the control unit 50 stores a map MP3 specifying the relationship between the temperature DF of the discharge pipe of the compressor 11 and the ambient temperature DOA to select the first protection control and the second protection control.
  • Fig. 9 shows an example of the map MP3.
  • the vertical axis indicates the temperature DF of the discharge pipe of the compressor 11, and the horizontal axis indicates the ambient temperature DOA.
  • the diagonal line indicates the boundary condition of the difference in temperature between the temperature DF of the discharge pipe and the ambient temperature DOA.
  • the unshaded region indicates a temperature region R3 in which all of temperature conditions c1, c2, and c3 are satisfied.
  • the control unit 50 determines whether the temperature DF of the discharge pipe and the ambient temperature DOA are in the temperature region R3. More specifically, the control unit 50 determines whether the temperature DF of the discharge pipe of the compressor 11 and the ambient temperature DOA are in the temperature region R3. When determining that the temperatures are in the temperature region R3, that is, when determining that the temperature conditions c1, c2, and c3 are satisfied, the control unit 50 uses the map MP1 when starting the heating operation to select one of the first protection control and the second protection control, and uses the map MP2 when starting the cooling operation to select one of the first protection control and the second protection control.
  • the control unit 50 executes the first protection control. As described above, when the relationship between the temperature DF of the discharge pipe of the compressor 11 and the ambient temperature DOA is added to the conditions for executing the second protection control, the second protection control is executed more appropriately in the cooling or heating operation.
  • a third protection control that differs from the first protection control and the second protection control may be executed as the compressor protection control.
  • the control unit 50 controls the compressor 11 so that the time for the operating frequency of the compressor 11 to reach the necessary operating frequency FN is longer than the time (the period TX) for the operating frequency of the compressor 11 to reach the necessary operating frequency FN in the first protection control.
  • the ambient temperature DOA is greater than or equal to the determination temperature threshold value DOAY and less than a determination temperature threshold value DOAZ that is greater than the determination temperature threshold value DOAY (DOAZ>DOAY), and the temperature DF of the discharge pipe of the compressor 11 is less than the temperature threshold value DFX.
  • a fourth protection control that differs from the first protection control and the second protection control may be executed as the compressor protection control.
  • the control unit 50 controls the compressor 11 so that the time for the operating frequency of the compressor 11 to reach the necessary operating frequency FN is longer than the time (the period TX) for the operating frequency of the compressor 11 to reach the necessary operating frequency FN in the first protection control and is shorter than the time for the operating frequency of the compressor 11 to reach the necessary operating frequency FN in the third protection control.
  • the ambient temperature DOA is greater than or equal to the determination temperature threshold value DOAZ, and the difference in temperature between the temperature DF of the discharge pipe and the ambient temperature DOA is less than the temperature difference threshold value DDY.
  • a fifth protection control that differs from the first protection control and the second protection control may be executed as the compressor protection control.
  • the control unit 50 controls the compressor 11 so that the time for the operating frequency of the compressor 11 to reach the necessary operating frequency FN is longer than the time (the period TX) for the operating frequency of the compressor 11 to reach the necessary operating frequency FN in the first protection control and is shorter than the time for the operating frequency of the compressor 11 to reach the necessary operating frequency FN in the fourth protection control.
  • At least one of the temperature condition a1 of the heating operation or the temperature condition b1 of the cooling operation may be omitted from the first activation control.
  • one of the outdoor controller 16 and the indoor controller 23 may be omitted.
  • the indoor temperature sensor 52 is connected to the outdoor controller 16 by wire or through wireless communication.
  • the indoor fan 22 is connected to the outdoor controller 16 by wire.
  • the outdoor controller 16 corresponds to the control unit.

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

Claims (4)

  1. Climatiseur, comprenant :
    un compresseur (11) dans lequel une fréquence de fonctionnement est modifiable ;
    une soupape de commutation à quatre voies (12) ; et
    une unité de commande (50) qui est configurée pour exécuter une commande de protection de compresseur, la commande de protection de compresseur augmentant la fréquence de fonctionnement du compresseur (11) jusqu'à une fréquence de fonctionnement nécessaire (FN) lors d'un déclenchement du compresseur pour débuter
    une opération de refroidissement ou une opération de chauffage, dans lequel
    la fréquence de fonctionnement nécessaire (FN) est une fréquence de fonctionnement nécessaire pour l'opération de refroidissement ou de chauffage,
    la commande de protection de compresseur inclut une première commande de protection et une seconde commande de protection,
    la première commande de protection commande la fréquence de fonctionnement de façon à ce qu'un temps à partir du moment où le compresseur (11) est déclenché jusqu'au moment où la fréquence de fonctionnement atteint la fréquence de fonctionnement nécessaire (FN) soit relativement long,
    la seconde commande de protection commande la fréquence de fonctionnement de façon à ce que le temps à partir du moment où le compresseur (11) est déclenché jusqu'au moment où la fréquence de fonctionnement atteint la fréquence de fonctionnement nécessaire (FN) soit relativement court,
    caractérisé en ce que
    lors d'un déclenchement du compresseur (11) conformément au début de l'opération de refroidissement ou de chauffage, l'unité de commande (50) est configurée pour réaliser une opération de déclenchement d'évacuation de réfrigérant qui fait fonctionner le compresseur (11) avec la soupape de commutation à quatre voies (12) commutée respectivement jusqu'à un cycle contraire pendant un temps prédéterminé, et
    dans lequel l'unité de commande (50) est configurée pour exécuter la seconde commande de protection après que l'opération de déclenchement d'évacuation de réfrigérant a été achevée.
  2. Climatiseur selon la revendication 1, dans lequel
    l'unité de commande (50) est configurée pour régler une première fréquence cible (FA1, FX1) et une seconde fréquence cible (FA2, FX2) dans la commande de protection de compresseur,
    la seconde fréquence cible (FA2, FX2) est plus grande que la première fréquence cible (FA1, FX1) et est inférieure à la fréquence de fonctionnement nécessaire (FN),
    l'unité de commande (50) est configurée pour maintenir la fréquence de fonctionnement à la première fréquence cible (FA1, FX1) pendant une première période (TA1, TX1) et à la seconde fréquence cible (FA2, FX2) pendant une seconde période (TA2, TX2) de façon à ce que la fréquence de fonctionnement augmente par étapes,
    la première fréquence cible (FA1) de la seconde commande de protection est plus grande que la première fréquence cible (FX1) de la première commande de protection, et
    la seconde fréquence cible (FA2) de la seconde commande de protection est plus grande que la seconde fréquence cible (FX2) de la première commande de protection.
  3. Climatiseur selon la revendication 1, dans lequel
    l'unité de commande (50) est configurée pour régler une première fréquence cible (FA1, FX1) et une seconde fréquence cible (FA2, FX2) dans la commande de protection de compresseur,
    la seconde fréquence cible (FA2, FX2) est plus grande que la première fréquence cible (FA1, FX1) et est inférieure à la fréquence de fonctionnement nécessaire (FN),
    l'unité de commande (50) est configurée pour maintenir la fréquence de fonctionnement à la première fréquence cible (FA1, FX1) pendant une première période (TA1, TX1) et à la seconde fréquence cible (FA2, FX2) pendant une seconde période (TA2, TX2) de façon à ce que la fréquence de fonctionnement augmente par étapes,
    la première période (TA1) de la seconde commande de protection est plus courte que la première période (TX1) de la première commande de protection, et
    la seconde période (TA2) de la seconde commande de protection est plus courte que la seconde période (TX2) de la première commande de protection.
  4. Climatiseur selon la revendication 2, dans lequel la première période (TA1) de la seconde commande de protection est plus courte que la première période (TX1) de la première commande de protection, et la seconde période (TA2) de la seconde commande de protection est plus courte que la seconde période (TX2) de la première commande de protection.
EP18873146.7A 2017-10-30 2018-09-27 Climatiseur Active EP3705808B1 (fr)

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JP2017209494A JP6601472B2 (ja) 2017-10-30 2017-10-30 空調装置
PCT/JP2018/036016 WO2019087630A1 (fr) 2017-10-30 2018-09-27 Climatiseur

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EP3705808A1 (fr) 2020-09-09
WO2019087630A1 (fr) 2019-05-09
JP6601472B2 (ja) 2019-11-06
JP2019082279A (ja) 2019-05-30
CN111279138A (zh) 2020-06-12
CN111279138B (zh) 2021-06-11

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