EP4047279B1 - Air conditioning apparatus - Google Patents

Air conditioning apparatus Download PDF

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Publication number
EP4047279B1
EP4047279B1 EP19949062.4A EP19949062A EP4047279B1 EP 4047279 B1 EP4047279 B1 EP 4047279B1 EP 19949062 A EP19949062 A EP 19949062A EP 4047279 B1 EP4047279 B1 EP 4047279B1
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EP
European Patent Office
Prior art keywords
time
restarting
unit
abnormality
compressor
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EP19949062.4A
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German (de)
English (en)
French (fr)
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EP4047279A4 (en
EP4047279A1 (en
Inventor
Yusuke KUWAHARA
Kazuhiko Kawai
Ippei SHINODA
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/37—Resuming operation, e.g. after power outages; Emergency starting
    • 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
    • F25B1/00—Compression machines, plants or systems with non-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
    • 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

Definitions

  • the present disclosure relates to an air-conditioning apparatus configured to condition air in an air-conditioned space.
  • Some air-conditioning apparatus monitors an operational state and, when it detects that an abnormality has occurred, stops operation completely and turns on an indicating lamp to notify a user that the abnormality has occurred.
  • an air-conditioning apparatus that has a detected abnormality stops its operation completely and outputs information that the abnormality has occurred to the management device through a communication unit.
  • a detected abnormality may be based on false detection in some cases.
  • false detection a case is conceivable in which a sensor that detects whether an abnormality has occurred receives an input signal of an abnormal value caused by a noise or other factor instantaneously.
  • a pressure sensor may falsely detect, as an abnormal state, a state in which refrigerant is unevenly distributed in a refrigerant circuit transiently and a pressure of refrigerant discharged from a compressor thus increases temporarily.
  • the air-conditioning apparatus normally continues its operation after the air-conditioning apparatus is restarted and then the sensor detects a normal value.
  • the air-conditioning apparatus In a case in which an abnormality is detected as refrigerant is unevenly distributed, the air-conditioning apparatus normally continues its operation by distributing the refrigerant evenly. Consequently, once an air-conditioning apparatus stops completely even by false detection, efficient air conditioning of an air-conditioned space is disturbed.
  • An air-conditioning-apparatus monitoring system has been proposed that stops an air-conditioning apparatus that has a detected abnormality temporarily and restarts the air-conditioning apparatus automatically after predetermined time elapses to prevent the air-conditioning apparatus being stopped completely when a temporal abnormality is detected (see, for example, Japanese Patent No. 3445904 ).
  • An air-conditioning apparatus disclosed in Japanese Patent No. 3445904 has means that stops a compressor in an abnormal state and restarts the compressor automatically after predetermined time elapses and allows restart up to predetermined times.
  • JP H09 149547 A states that the voltage of a power supply is transformed by a transformer, and rectified and smoothed by a diode bridge, a resistor and a capacitor. It is then input to the supply voltage detecting circuit in a control circuit.
  • a restart voltage changing circuit increases supply voltage that can be restarted relative to the voltage detected at the supply voltage detecting circuit, and transmits a changed set voltage to a low voltage protective circuit.
  • the low voltage protective circuit controls a start control circuit and turns on/off a power relay based on this set voltage. It stops the operation of a compressor if the voltage of the power supply drops lower than a preset voltage value.
  • JP H08 254362 A states that an air conditioner is constructed such that a compressor, a four-way valve, an indoor heat exchanger, an expansion mechanism and an outdoor heat exchanger are connected in series so as to constitute a refrigerating cycle. There are provided an operation control means for the compressor and a defrosting operation control means for defrosting of an outdoor device for operating the compressor during a heating operation.
  • a re-energizing delay means for stopping a re-energizing operation of the compressor is operated and when a pressure of sucked refrigerant of the compressor is less than a set value, a low pressure sensing means is operated such that the operation of the compressor is stopped, and in turn, when a heating is started upon completion of the defrosting operation and the pressure sensing means is operated within a predetermined time from a starting of the compressor, the compressor is stopped and a required time until a next re-energizing operation is performed is set to be elongated by more than a set time of the re-energizing delay means by the re-energizing protection means.
  • JP H07 151398 A states that a load current flowing to a compressor is detected by current detecting means, and this detected value is compared with a reference value by current comparing means. When it is a normal value, the compressor is started. However, if a pressure balance of a refrigerant circuit is not yet obtained, the compressor is locked and a large current is detected by the means, a compressor relay is turned OFF. Then, a set time of a restart preventive timer is extended for a predetermined time. Thus, the set time of the timer is altered based on a detected value of the means. In this manner, there is no danger of burning a motor winding of the compressor, and hence restart of the compressor can be smoothly and effectively conducted.
  • JP H08 40055 A states that operation of the restart prohibiting time of a compressor is performed from an outside temperature just after the compressor is stopped.
  • the restart prohibiting time of the compressor is set short as the outside air temperature (just before) at compressor stopping time becomes low. Therefore, since the restart prohibiting time obtained by the operation from the outside air temperature can be set in the proper time, useless stopping of the compressor can be prevented.
  • the present invention is made to solve such a problem described above and to provide an air-conditioning apparatus that prevents air-conditioning operation being stopped for longer time than required.
  • an air-conditioning apparatus as defined in claim 1.
  • an air-conditioning apparatus as defined in claim 5.
  • air-conditioning operation is prevented from being stopped for longer time than required as a restarting time of a device is changed on the basis of a type of an abnormality that occurs at the device.
  • FIG. 1 is a refrigerant circuit diagram that illustrates an exemplary configuration of an air-conditioning apparatus according to Example 1.
  • FIG. 2 is a functional block diagram that illustrates an exemplary configuration of a controller illustrated in Fig. 1 .
  • An air-conditioning apparatus 1 has a heat source-side unit 2 that provides a heat source, a load-side unit 3 that conditions air in an air-conditioned space by use of the heat source, a detection unit 30 (see Fig. 2 ) that detects an abnormality that occurs at the air-conditioning apparatus 1, and a controller 40.
  • Example 1 a case is described in which the air-conditioned space is an inside of a room to which the load-side unit 3 is installed.
  • the heat source-side unit 2 has a compressor 4 that compresses and discharges refrigerant, a four-way valve 5 that switches flow directions of refrigerant, a heat source-side heat exchanger 6 that allows outdoor air and refrigerant to exchange heat with each other, and a fan 9 that supplies outdoor air to the heat source-side heat exchanger 6.
  • the load-side unit 3 has a load-side heat exchanger 8 that allows indoor air and refrigerant to exchange heat with each other, an expansion valve 7 that depressurizes and expands refrigerant, and a fan 10 that supplies indoor air to the load-side heat exchanger 8.
  • the compressor 4 is, for example, an inverter-driven compressor whose capacity is changeable.
  • the expansion valve 7 is, for example, an electronic expansion valve.
  • the heat source-side heat exchanger 6 and the load-side heat exchanger 8 are, for example, fin-and-tube heat exchangers.
  • the compressor 4, the four-way valve 5, the heat source-side heat exchanger 6, the expansion valve 7, and the load-side heat exchanger 8 are connected via refrigerant pipes 11 and thus form a refrigerant circuit 20 through which refrigerant is circulated.
  • the compressor 4, the four-way valve 5, the expansion valve 7, the fan 9, and the fan 10 are each connected to the controller 40 via an unillustrated signal line.
  • the detection unit 30 has a suction pressure sensor 31, a discharge pressure sensor 32, a discharge temperature sensor 33, an electric abnormality detection sensor 34, a room temperature sensor 35, a pressure sensor 36, and an electric abnormality detection sensor 37.
  • the suction pressure sensor 31, the discharge pressure sensor 32, the discharge temperature sensor 33, the electric abnormality detection sensor 34, the room temperature sensor 35, the pressure sensor 36, and the electric abnormality detection sensor 37 are each connected to the controller 40 via an unillustrated signal line.
  • the suction pressure sensor 31 has an unillustrated pressure sensor that detects a suction pressure Pin that is a pressure of refrigerant to be sucked into the compressor 4 and an unillustrated comparison circuit that compares the suction pressure Pin with a predetermined high-pressure threshold value HIth and compares the suction pressure Pin with a predetermined low-pressure threshold value Llth.
  • the unillustrated comparison circuit of the suction pressure sensor 31 outputs an abnormality signal that indicates that an abnormality has occurred to the controller 40 in a case in which the detected suction pressure Pin is higher than or equal to the high-pressure threshold value HIth.
  • the unillustrated comparison circuit of the suction pressure sensor 31 outputs an abnormality signal to the controller 40 in a case in which the detected suction pressure Pin is lower than or equal to the low-pressure threshold value Llth.
  • the values HIth and LIth have a relation of HIth > Llth.
  • the discharge pressure sensor 32 has an unillustrated pressure sensor that detects a discharge pressure Pout that is a pressure of refrigerant discharged from the compressor 4 and an unillustrated comparison circuit that compares the discharge pressure Pout with a predetermined high-pressure threshold value HOth and compares the discharge pressure Pout with a predetermined low-pressure threshold value LOth.
  • the unillustrated comparison circuit of the discharge pressure sensor 32 outputs an abnormality signal to the controller 40 in a case in which the detected discharge pressure Pout is higher than or equal to the high-pressure threshold value HOth.
  • the unillustrated comparison circuit of the discharge pressure sensor 32 outputs an abnormality signal to the controller 40 in a case in which the detected discharge pressure Pout is lower than or equal to the low-pressure threshold value LOth.
  • the values HOth and LOth have a relation of HOth > LOth.
  • the discharge temperature sensor 33 has an unillustrated temperature sensor that detects a discharge temperature Tout that is a temperature of refrigerant discharged from the compressor 4 and an unillustrated comparison circuit that compares the discharge temperature Tout with a predetermined refrigerant temperature threshold value RTth1.
  • the unillustrated comparison circuit of the discharge temperature sensor 33 outputs an abnormality signal to the controller 40 in a case in which the detected discharge temperature Tout is higher than or equal to the refrigerant temperature threshold value RTth1.
  • the pressure sensor 36 has an unillustrated pressure sensor that detects a pressure MP of refrigerant that flows through a refrigerant pipe 11 between the heat source-side heat exchanger 6 and the expansion valve 7 and an unillustrated comparison circuit that compares the pressure MP of the refrigerant with a predetermined middle pressure threshold value MPth.
  • the unillustrated comparison circuit of the pressure sensor 36 outputs an abnormality signal to the controller 40 in a case in which the detected pressure MP of the refrigerant is higher than or equal to the middle pressure threshold value MPth.
  • the room temperature sensor 35 has an unillustrated temperature sensor that detects a room temperature and an unillustrated comparison circuit that compares the room temperature with a predetermined room temperature threshold value RTth2.
  • the unillustrated temperature sensor of the room temperature sensor 35 detects a room temperature at predetermined intervals and outputs a detected value to the controller 40.
  • the unillustrated comparison circuit of the room temperature sensor 35 outputs an abnormality signal to the controller 40 in a case in which the room temperature is higher than or equal to the room temperature threshold value RTth2.
  • the electric abnormality detection sensor 34 has an unillustrated current sensor that detects a current CI that flows through a winding wire of an unillustrated motor provided to the compressor 4 and an unillustrated voltage sensor that detects a voltage CV applied to the winding wire.
  • the electric abnormality detection sensor 34 has an unillustrated current comparison circuit that compares the current CI with a predetermined current threshold value Ith1 and an unillustrated voltage comparison circuit that compares the voltage CV with a predetermined voltage threshold value Vth1.
  • the unillustrated current comparison circuit of the electric abnormality detection sensor 34 outputs an abnormality signal to the controller 40 in a case in which the detected current CI is higher than or equal to the current threshold value Ith1.
  • the unillustrated voltage comparison circuit of the electric abnormality detection sensor 34 outputs an abnormality signal to the controller 40 in a case in which the detected voltage CV is higher than or equal to the voltage threshold value Vth1.
  • the electric abnormality detection sensor 37 has an unillustrated current sensor that detects a current FI that flows through a winding wire of an unillustrated motor provided to the fan 10 and an unillustrated voltage sensor that detects a voltage FV applied to the winding wire.
  • the electric abnormality detection sensor 37 has an unillustrated current comparison circuit that compares the current FI with a predetermined current threshold value Ith2 and an unillustrated voltage comparison circuit that compares the voltage FV with a predetermined voltage threshold value Vth2.
  • the unillustrated current comparison circuit of the electric abnormality detection sensor 37 outputs an abnormality signal to the controller 40 in a case in which the detected current FI is higher than or equal to the current threshold value Ith2.
  • the unillustrated voltage comparison circuit of the electric abnormality detection sensor 37 outputs an abnormality signal to the controller 40 in a case in which the detected voltage FV is higher than or equal to the voltage threshold value Vth2.
  • Fig. 3 is a diagram that illustrates another exemplary configuration of a sensor that detects an abnormality of the compressor illustrated in Fig. 1 .
  • the detection unit 30 illustrated in Fig. 2 may have a pressure difference sensor 38 illustrated in Fig. 3 in place of the suction pressure sensor 31 and the discharge pressure sensor 32.
  • the pressure difference sensor 38 is connected to the controller 40 via an unillustrated signal line.
  • the pressure difference sensor 38 has an unillustrated pressure sensor that detects a pressure difference ⁇ P between a suction pressure and a discharge pressure and an unillustrated comparison circuit that compares the pressure difference ⁇ P with a predetermined high threshold value PDHth and compares the pressure difference ⁇ P with a predetermined low threshold value PDLth.
  • the unillustrated comparison circuit of the pressure difference sensor 38 outputs an abnormality signal to the controller 40 in a case in which the pressure difference ⁇ P is larger than or equal to the high threshold value PDHth.
  • the unillustrated comparison circuit of the pressure difference sensor 38 outputs an abnormality signal to the controller 40 in a case in which the pressure difference ⁇ P is smaller than or equal to the low threshold value PDLth.
  • the values PDHth and PDLth have a relation of PDHth > PDLth.
  • the controller 40 includes a memory 41 and a central processing unit (CPU) 42.
  • the memory 41 has a read only memory (ROM) that stores a program and a random access memory (RAM) that stores data of a calculation process of the CPU 42.
  • the CPU 42 is also referred to as a processor, a microprocessor, a microcomputer, and a digital signal processor (DSP).
  • the CPU 42 reads out a program stored in a ROM and executes a process in accordance with the program.
  • the controller 40 includes a refrigeration cycle control unit 51, a time changing unit 52, a restarting unit 53, and a timer 54.
  • the timer 54 measures time and transmits information of the measured time to the restarting unit 53.
  • the refrigeration cycle control unit 51 controls the four-way valve 5 according to an operation mode such as cooling operation and heating operation of the load-side unit 3.
  • the refrigeration cycle control unit 51 controls a refrigeration cycle of the refrigerant circuit 20 on the basis of a room temperature and a set temperature. Specifically, the refrigeration cycle control unit 51 controls an operation frequency of the compressor 4, an opening degree of the expansion valve 7, and rotation frequencies of the fans 9 and 10 so that the room temperature and the set temperature are in the same predetermined range.
  • the set temperature is set by a user with the controller 40 via an unillustrated remote controller.
  • the time changing unit 52 judges whether the detection unit 30 has detected an abnormality at predetermined intervals.
  • the time changing unit 52 changes, from a predetermined reference time tref, on the basis of a type of a detected abnormality, a restarting time tret from time when a device that has the abnormality is stopped to time when the device is restarted.
  • the time changing unit 52 identifies a target device of which the restarting time tret is to be changed on the basis of a type of an abnormality.
  • the time changing unit 52 transmits information of the target device to be restarted and the restarting time tret to the restarting unit 53.
  • the time changing unit 52 may use, to judge whether the compressor 4 has an abnormality, any one of a discharge temperature Tout, the suction pressure Pin, and the discharge pressure Pout.
  • the time changing unit 52 may use, to judge whether the compressor 4 has an abnormality, the pressure difference ⁇ P between the suction pressure Pin and the discharge pressure Pout.
  • a specific example is described below in which the restarting time tret is changed on the basis of a type of an abnormality.
  • a case is described below in which a device to be restarted on the basis of a type of a detected abnormality is the compressor 4.
  • a case is described below in which a pressure difference ⁇ P detected by the pressure difference sensor 38 illustrated in Fig. 3 is used to set the restarting time tret.
  • the time changing unit 52 In a case in which the time changing unit 52 receives, from the pressure difference sensor 38, an abnormality signal that indicates that a pressure difference ⁇ P is larger than or equal to the high threshold value PDHth, the time changing unit 52 sets the restarting time tret longer than the reference time tref.
  • a restarting time tret in a case in which a pressure difference ⁇ P is larger than or equal to the high threshold value PDHth is defined as a restarting time tret1.
  • the time changing unit 52 sets the restarting time tret shorter than the reference time tref.
  • a restarting time tret in a case in which a pressure difference ⁇ P is smaller than or equal to the low threshold value PDLth is defined as a restarting time tret2.
  • the low threshold value PDLth is, for example, 0.2 MPa.
  • the high-pressure threshold value HOth is, for example, 2.0 MPa.
  • the low-pressure threshold value LOth is, for example, 0.3 MPa.
  • Such a restarting time tret in a case in which a discharge pressure Pout is higher than or equal to the high-pressure threshold value HOth is defined as a restarting time tret3.
  • the time changing unit 52 receives, from the discharge pressure sensor 32, an abnormality signal that indicates that a discharge pressure Pout is lower than or equal to the low-pressure threshold value LOth, the time changing unit 52 sets the restarting time tret longer than the reference time tref.
  • Such a restarting time tret in a case in which a discharge pressure Pout is lower than or equal to the low-pressure threshold value LOth is defined as a restarting time tret4.
  • a discharge temperature Tout detected by the discharge temperature sensor 33 illustrated in Fig. 1 is used to set the restarting time tret.
  • the refrigerant temperature threshold value RTth1 is, for example, 95 degrees C.
  • the time changing unit 52 receives, from the discharge temperature sensor 33, an abnormality signal that indicates that a discharge temperature Tout is higher than or equal to the refrigerant temperature threshold value RTth1, the time changing unit 52 sets the restarting time tret longer than the reference time tref.
  • Such a restarting time tret in a case in which a discharge temperature Tout is higher than or equal to the refrigerant temperature threshold value RTth1 is defined as a restarting time tret5.
  • the restarting time has a relation of tret3 ⁇ tret1.
  • a pressure difference ⁇ P may also increase.
  • the time changing unit 52 may thus set the restarting time tret to the restarting time tret1.
  • the restarting time has a relation of tret4 ⁇ tret1.
  • a pressure difference ⁇ P may also increase.
  • the time changing unit 52 may thus set the restarting time tret to the restarting time tret1.
  • the restarting time has a relation of tret5 ⁇ tret1.
  • a pressure difference ⁇ P may also increase.
  • the time changing unit 52 may thus set the restarting time tret to the restarting time tret1.
  • a discharge pressure Pout is high, the possibility exists that the compressor 4 may be broken, and, to secure the compressor 4, the restarting time tret is thus desirable to have a relation of tret3 > tret5 > tret4.
  • the restarting unit 53 and the timer 54 illustrated in Fig. 2 are described below.
  • the restarting unit 53 refers to time measured by the timer 54 and judges whether an elapsed time t that has elapsed after a device is stopped is longer than or equal to the set restarting time tret.
  • the restarting unit 53 receives information of the target device to be restarted and the restarting time tret from the time changing unit 52, the restarting unit 53 stops the target device to be restarted and then, when the restarting time tret received from the time changing unit 52 has elapsed, restarts the stopped device.
  • the restarting unit 53 counts the number of times of restart Cret that is the number of times of restart of the device and judges whether the counted number of times of restart Cret has reached a predetermined reference number of times Cref.
  • the reference number of times Cref is, for example, two to five times.
  • the restarting unit 53 conclusively determines that the abnormality is not falsely detected and the target device to be restarted actually has the abnormality.
  • the restarting unit 53 stops restart of the target device.
  • a communication connection means is not limited to cable communications and may be radio communications and may be a means obtained by combining cable communications and radio communications.
  • a communication connection means between the controller 40 and each sensor is also not limited to cable communications and may be radio communications and may be a means obtained by combining cable communications and radio communications.
  • each sensor of the suction pressure sensor 31, the discharge pressure sensor 32, and the discharge temperature sensor 33 may output a detected value to the controller 40 not only in a case in which an abnormality signal is output but also at predetermined intervals.
  • the refrigeration cycle control unit 51 may use at least one value of the suction pressure, the discharge pressure, and the discharge temperature to control the refrigeration cycle.
  • the detection unit 30 does not have to have all of the suction pressure sensor 31, the discharge pressure sensor 32, the discharge temperature sensor 33, the electric abnormality detection sensor 34, the room temperature sensor 35, the pressure sensor 36, and the electric abnormality detection sensor 37.
  • the detection unit 30 is only required to have one or more of the suction pressure sensor 31, the discharge pressure sensor 32, the discharge temperature sensor 33, the electric abnormality detection sensor 34, the room temperature sensor 35, the pressure sensor 36, and the electric abnormality detection sensor 37.
  • Fig. 4 is a flowchart that illustrates an exemplary operational procedure of the air-conditioning apparatus according Example 1.
  • the time changing unit 52 judges whether the detection unit 30 has detected an abnormality at predetermined intervals (step S101).
  • the time changing unit 52 set the restarting time tret on the basis of a type of the abnormality (step S102).
  • the time changing unit 52 identifies a target device of which the restarting time tret is to be changed on the basis of the type of the abnormality.
  • step S102 illustrated in Fig. 4 when the time changing unit 52 sets the restarting time tret, the time changing unit 52 transmits information of the set restarting time tret to the restarting unit 53.
  • the restarting unit 53 stops a device on the basis of the type of the abnormality (step S103). Specifically, the restarting unit 53 stops electric power supply to the device.
  • the restarting unit 53 refers to time measured by the timer 54 and judges whether an elapsed time t that has elapsed after the device is stopped is longer than or equal to the set restarting time tret (step S104).
  • the restarting unit 53 restarts the stopped device (step S105). Specifically, the restarting unit 53 restarts electric power supply to the stopped device.
  • the restarting unit 53 counts the number of times of restart Cret and judges whether the counted number of times of restart Cret is larger than or equal to the reference number of times Cref (step S106). In a case in which the number of times of restart Cret has not reached the reference number of times Cref, the controller 40 returns to step S101. In a case in which the number of times of restart Cret has reached the reference number of times Cref, the restarting unit 53 conclusively determines that an abnormality has occurred (step S107).
  • a value that indicates an abnormality that occurs at the compressor 4 is the discharge pressure Pout, the pressure difference ⁇ P, or the discharge temperature Tout.
  • the value that indicates a type of an abnormality is not limited to these detected value.
  • the time changing unit 52 receives, from the electric abnormality detection sensor 34, an abnormality signal that indicates that an over-current flows, the time changing unit 52 makes the restarting time tret shorter than the reference time tref.
  • a device related to a detected abnormality is the compressor 4.
  • a device related to a detected abnormality is not limited to the compressor 4.
  • a device related to a detected abnormality may be the fan 10.
  • a sensor equivalent to the electric abnormality detection sensor 37 may be provided to the fan 9.
  • a target to be monitored for whether an abnormality has occurred may be a control board on which a circuit that controls devices such as the compressor 4 and may be an unillustrated motor provided to devices such as the compressor 4.
  • the time changing unit 52 judges that the abnormality is an abnormality that has occurred at the fan 10.
  • the time changing unit 52 may set the restarting time tret longer than the reference time tref.
  • the time changing unit 52 may change the restarting time tret.
  • the communication abnormality is, for example, an abnormality in a case in which the refrigeration cycle control unit 51 does not receive a response signal from the compressor 4 to a control signal transmitted to the compressor 4. In this case, the refrigeration cycle control unit 51 transmits an abnormality signal that an abnormality has occurred in commutation between the refrigeration cycle control unit 51 and the compressor 4 to the time changing unit 52.
  • a cause of the communication abnormality is a short circuit that has occurred in an unillustrated communication circuit, even when time elapses, an abnormality state remains. It is thus more effective to perform restart in an early stage than to make the restarting time tret longer. For this reason, the time changing unit 52 makes the restarting time tret shorter than the reference time tref.
  • the detection unit 30 may have an unillustrated sensor that detects a communication abnormality in each of the devices that communicate with the controller 40.
  • a restarting time is considered below in a case in which an abnormality of, for example, a compressor that is among a plurality of devices provided to some air-conditioning apparatus has been detected.
  • the detected abnormality related to the compressor is falsely detected, no more abnormality is detected after the compressor is stopped for a short time such as several seconds and then the compressor is restarted.
  • longer restarting time is required than one in the case of false detection. While the compressor is stopped, however, operation of the air-conditioning apparatus is also stopped.
  • the air-conditioning apparatus has the detection unit 30 configured to detect an abnormality of a device such as the compressor 4 and the controller 40 configured to, when an abnormality is detected by the detection unit 30, stop the device and then restart the device.
  • the controller 40 includes the time changing unit 52 and the restarting unit 53.
  • the time changing unit 52 changes, from the predetermined reference time tref, on the basis of a type of an abnormality detected by the detection unit 30, the restarting time tret from time when the device is stopped to time when the device is restarted.
  • the restarting unit 53 stops the device and then, when the restarting time tret set by the time changing unit 52 has elapsed, restarts the device.
  • the restarting time of a device is changed on the basis of a type of an abnormality that occurs at the device. Air-conditioning operation is therefore prevented from being stopped for longer time than required.
  • the type of the abnormality is an abnormality that the pressure difference ⁇ P between a suction pressure and a discharge pressure at the compressor 4 is high
  • the restarting time tret is set shorter than the reference time tref. For this reason, non-operation time during which operation of the compressor 4 is stopped is shorter than one in the case in which the restarting time tret is equal to the reference time tref, so that stop time during which air-conditioning operation remains stopped is reduced.
  • An air-conditioning apparatus has an auxiliary device provided to at least one of a plurality of devices provided to the air-conditioning apparatus 1 and the auxiliary device supports operation of the at least one device.
  • the first embodiment of the invention is described below with a case in which the auxiliary device of the compressor 4 is provided to the air-conditioning apparatus 1.
  • FIG. 5 is a refrigerant circuit diagram that illustrates an exemplary configuration of an air-conditioning apparatus according to Modification 1.
  • FIG. 6 is a functional block diagram that illustrates an exemplary configuration of a controller illustrated in Fig. 5 .
  • the heat source-side unit 2 of the air-conditioning apparatus 1a according to the first embodiment of the invention has a compressor 4a and a compressor 4b.
  • the compressors 4a and 4b are arranged in parallel to each other and connected to the four-way valve 5.
  • the compressor 4b operates as an auxiliary device to support operation of the compressor 4a.
  • the compressor 4b stops while the compressor 4a is in operation.
  • the compressor 4b may also be in operation while the compressor 4a is in operation.
  • the refrigeration cycle control unit 51 controls the compressors 4a and 4b such that a load on the compressor 4b is lighter than a load on the compressor 4a.
  • the time changing unit 52 When the time changing unit 52 receives an abnormality signal related to the compressor 4a from the detection unit 30, the time changing unit 52 sets the restarting time tret shorter than the reference time tref. This is because, by shortening time to judge whether an abnormality has occurred at the compressor 4a, in a case in which an abnormality has occurred at the compressor 4a, restarts the compressor 4b, which is the auxiliary device, in an early stage so that air-conditioning operation is allowed to continue.
  • compressors 4a and 4b in Modification 1 each have the same configuration of the compressor 4 described with reference to Fig. 1 , their detailed description is omitted.
  • suction pressure sensors 31a and 31b each have the same configuration of the suction pressure sensor 31 described with reference to Fig. 1 , their detailed description is omitted.
  • discharge pressure sensors 32a and 32b each have the same configuration of the discharge pressure sensor 32 described with reference to Fig. 1 , their detailed description is omitted.
  • discharge temperature sensors 33a and 33b each have the same configuration of the discharge temperature sensor 33 described with reference to Fig. 1 , their detailed description is omitted.
  • electric abnormality detection sensors 34a and 34b each have the same configuration of the electric abnormality detection sensor 34 described with reference to Fig. 1 , their detailed description is omitted.
  • step S101 is the same process described with reference to Fig. 4 , its description is omitted.
  • step S102 the time changing unit 52 receives an abnormality signal from the detection unit 30 and, in a case in which a type of the abnormality is related to the compressor 4a, sets the restarting time tret shorter than the reference time tref.
  • the time changing unit 52 transmits information of the set restarting time tret to the restarting unit 53.
  • the restarting unit 53 stops the compressor 4a (step S103).
  • the restarting unit 53 refers to time measured by the timer 54 and judges whether an elapsed time t that has elapsed after the compressor 4a is stopped is longer than or equal to the restarting time tret (step S104).
  • the restarting unit 53 restarts the compressor 4a (step S105).
  • the restarting unit 53 counts the number of times of restart Cret and judges whether the counted number of times of restart Cret is larger than or equal to the reference number of times Cref (step S106).
  • the restarting unit 53 conclusively determines that an abnormality has occurred (step S107).
  • the restarting unit 53 then performs emergency operation in which the compressor 4b, which is the auxiliary device, is made to operate in place of the compressor 4a. Specifically, the restarting unit 53 stops restart of the compressor 4a and start the compressor 4b. Furthermore, the restarting unit 53 transmits information that the compressor 4a is stopped and the compressor 4b is started to the refrigeration cycle control unit 51.
  • the air-conditioning apparatus 1a has the compressor 4b, which backs up operation of the compressor 4a. According to the first embodiment of the invention, the air-conditioning apparatus 1a conclusively determines in short time whether a detected abnormality is falsely detected and whether an abnormality has occurred at the compressor 4a and shifts in short time to the emergency operation, in which the compressor 4b, which is the auxiliary device, is made to operate in place of the compressor 4a. Time during which the air-conditioning apparatus 1a has to be stopped is thus shortened. As a result, comfortable air-conditioned environment remains inside a room and comfort of a user is not impaired.
  • an auxiliary device provided to the air-conditioning apparatus 1a is the compressor 4b. Furthermore, a device to which an auxiliary device is provided is not limited to the compressor. In the air-conditioning apparatus 1a, an auxiliary device may be provided to one or each of the fans 9 and 10.
  • An air-conditioning apparatus has a plurality of heat source-side units.
  • the same reference signs are added to the same components as those described in Example 1 and detailed description of these components is omitted.
  • FIG. 7 is a refrigerant circuit diagram that illustrates an exemplary configuration of an air-conditioning apparatus according to Embodiment 2.
  • Fig. 8 is a functional block diagram that illustrates an exemplary configuration of a controller illustrated in Fig. 7 .
  • an air-conditioning apparatus 1b has heat source-side units 2a and 2b and the load-side unit 3.
  • the heat source-side units 2a and 2b are arranged in parallel to each other and connected to the load-side unit 3.
  • the heat source-side unit 2b operates as an auxiliary device to support operation of the heat source-side unit 2a.
  • the heat source-side unit 2b stops while the heat source-side unit 2a is in operation.
  • the heat source-side unit 2b may also be in operation while the heat source-side unit 2a is in operation.
  • the refrigeration cycle control unit 51 controls the heat source-side units 2a and 2b such that a load on the heat source-side unit 2b is lighter than a load on the heat source-side unit 2a.
  • the time changing unit 52 When the time changing unit 52 receives an abnormality signal related to a device provided to the heat source-side unit 2a from the detection unit 30, the time changing unit 52 sets the restarting time tret shorter than the reference time tref. This is because, by shortening time to judge whether an abnormality has occurred at the heat source-side unit 2a, in a case in which an abnormality has occurred at the heat source-side unit 2a, restarts the heat source-side unit 2b, which is the auxiliary device, in an early stage so that air-conditioning operation is allowed to continue.
  • the four-way valves 5a and 5b in the second embodiment of the invention each have the same configuration of the four-way valve 5 described with reference to Fig. 1 , their detailed description is omitted.
  • the heat source-side heat exchangers 6a and 6b each have the same configuration of the heat source-side heat exchanger 6 described with reference to Fig. 1 , their detailed description is omitted.
  • the fans 9a and 9b each have the same configuration of the fan 9 described with reference to Fig. 1 , their detailed description is omitted.
  • the refrigerant pipes 11a and 11b each have the same configuration of the refrigerant pipes 11 described with reference to Fig. 1 , their detailed description is omitted.
  • the controller 40 controls the heat source-side units and 2a and 2b.
  • the controller 40 may be provided to each of the heat source-side units 2a and 2b.
  • a case is described in the second embodiment of the invention in which the air-conditioning apparatus 1b has one heat source-side unit 2b as the auxiliary device of the heat source-side unit 2a.
  • the air-conditioning apparatus 1b may have two or more auxiliary devices.
  • Fig. 9 is a flowchart that illustrates an exemplary operational procedure of the air-conditioning apparatus according to the second embodiment of the invention.
  • step S201 is the same process of step S101 described with reference to Fig. 4 , its description is omitted from the second embodiment of the invention.
  • step S202 the time changing unit 52 receives an abnormality signal from the detection unit 30 and, in a case in which a type of an abnormality is related to the heat source-side unit 2a, sets the restarting time tret shorter than the reference time tref.
  • the time changing unit 52 transmits information of the set restarting time tret to the restarting unit 53.
  • the restarting unit 53 stops the heat source-side unit 2a (step S203).
  • the restarting unit 53 refers to time measured by the timer 54 and judges whether an elapsed time t that has elapsed after the heat source-side unit 2a is stopped is longer than or equal to the restarting time tret (step S204).
  • the restarting unit 53 restarts the heat source-side unit 2a (step S205).
  • the restarting unit 53 counts the number of times of restart Cret of the heat source-side unit 2a and judges whether the counted number of times of restart Cret is larger than or equal to the reference number of times Cref (step S206).
  • the restarting unit 53 conclusively determines that an abnormality has occurred (step S207).
  • the restarting unit 53 then performs emergency operation in which the heat source-side unit 2b, which is the auxiliary device of the heat source-side unit 2a, is made to operate in place of the heat source-side unit 2a (step S208).
  • the restarting unit 53 stops restart of the heat source-side unit 2a and start the heat source-side unit 2b. Furthermore, the restarting unit 53 transmits information that the heat source-side unit 2a is stopped and the heat source-side unit 2b is started to the refrigeration cycle control unit 51.
  • the air-conditioning apparatus 1b has the heat source-side unit 2b, which backs up operation of the heat source-side unit 2a. According to the second embodiment of the invention, the air-conditioning apparatus 1b conclusively determines in short time whether a detected abnormality is falsely detected and whether an abnormality has occurred at the heat source-side unit 2a and shifts in short time to the emergency operation, in which the heat source-side unit 2b, which is the auxiliary device, is made to operate in place of the heat source-side unit 2a. Time during which the air-conditioning apparatus 1b has to be stopped is thus shortened. As a result, comfortable air-conditioned environment remains inside a room and comfort of a user is not impaired.
  • Example 1 A case is described in Example 1 and in the second embodiment of the invention in which the air-conditioning apparatus 1, 1a, and 1b are each a split model that has a heat source-side unit and a load-side unit split from each other. Furthermore, the air-conditioning apparatus may be a remote model in which a compressor is mounted to an indoor unit.
  • the detection unit 30 judges whether an abnormality occurs.
  • the time changing unit 52 may judge whether an abnormality occurs by comparing a detected value of each sensor with a threshold value set for the detected value.
  • 1, 1a, 1b air-conditioning apparatus, 2, 2a, 2b: heat source-side unit, 3: load-side unit, 4, 4a, 4b: compressor, 5, 5a, 5b: four-way valve, 6, 6a, 6b: heat source-side heat exchanger, 7: expansion valve, 8: load-side heat exchanger, 9, 9a, 9b: fan, 10: fan, 11, 11a, 11b: refrigerant pipe, 20: refrigerant circuit, 30: detection unit, 31, 31a, 31b: suction pressure sensor, 32, 32a, 32b: discharge pressure sensor, 33, 33a, 33b: discharge temperature sensor, 34, 34a, 34b: electric abnormality detection sensor, 35: room temperature sensor, 36: pressure sensor, 37: electric abnormality detection sensor, 38: pressure difference sensor, 40: controller, 41: memory, 42: CPU, 51: refrigeration cycle control unit, 52: time changing unit, 53: restarting unit, 54: timer

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)
EP19949062.4A 2019-10-16 2019-10-16 Air conditioning apparatus Active EP4047279B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/040622 WO2021074991A1 (ja) 2019-10-16 2019-10-16 空気調和装置

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EP4047279A1 EP4047279A1 (en) 2022-08-24
EP4047279A4 EP4047279A4 (en) 2022-10-19
EP4047279B1 true EP4047279B1 (en) 2023-11-22

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Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
JPH07151398A (ja) * 1993-11-29 1995-06-13 Sharp Corp 空気調和機
JP3381345B2 (ja) * 1993-12-21 2003-02-24 松下電器産業株式会社 空気調和機の運転制御装置
JPH0840055A (ja) * 1994-07-29 1996-02-13 Zexel Corp 車両用空調装置のコンプレッサ制御装置
JP3449447B2 (ja) * 1995-03-16 2003-09-22 東芝キヤリア株式会社 空気調和機の制御装置
JPH09149547A (ja) * 1995-11-24 1997-06-06 Matsushita Electric Ind Co Ltd 空気調和機の運転制御装置と運転制御方法
JP3445904B2 (ja) 1996-07-25 2003-09-16 株式会社エヌ・ティ・ティ ファシリティーズ 空調機監視システム装置
JP3438812B2 (ja) * 1998-07-10 2003-08-18 松下電器産業株式会社 故障診断装置
KR100712855B1 (ko) * 2005-07-14 2007-05-02 엘지전자 주식회사 열병합 발전 시스템 및 그 제어방법
JP5342528B2 (ja) * 2010-09-25 2013-11-13 日立アプライアンス株式会社 アクティブフィルタを備えた空気調和装置

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JP7237182B2 (ja) 2023-03-10
EP4047279A1 (en) 2022-08-24
JPWO2021074991A1 (ja) 2021-04-22
WO2021074991A1 (ja) 2021-04-22

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