WO2021171448A1 - Dispositif à cycle de réfrigération - Google Patents

Dispositif à cycle de réfrigération Download PDF

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Publication number
WO2021171448A1
WO2021171448A1 PCT/JP2020/007888 JP2020007888W WO2021171448A1 WO 2021171448 A1 WO2021171448 A1 WO 2021171448A1 JP 2020007888 W JP2020007888 W JP 2020007888W WO 2021171448 A1 WO2021171448 A1 WO 2021171448A1
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WIPO (PCT)
Prior art keywords
temperature
pressure sensor
refrigeration cycle
pressure
control device
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PCT/JP2020/007888
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English (en)
Japanese (ja)
Inventor
端之 松下
康敬 落合
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2022502688A priority Critical patent/JP7350151B2/ja
Priority to PCT/JP2020/007888 priority patent/WO2021171448A1/fr
Publication of WO2021171448A1 publication Critical patent/WO2021171448A1/fr

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    • 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

Definitions

  • the present disclosure relates to a refrigeration cycle device equipped with a pressure sensor.
  • Patent Document 1 a method for diagnosing an abnormality of a pressure sensor in a refrigeration cycle device is known (see, for example, Patent Document 1).
  • Patent Document 1 in the refrigerant circuit of the refrigerating apparatus, a high-pressure pressure sensor that detects the pressure on the discharge side of the compressor, a low-pressure pressure sensor that detects the pressure on the suction side of the compressor, and the ambient temperature of the refrigerating apparatus are detected.
  • An ambient temperature sensor is provided. Then, based on the pressure detected by each pressure sensor, it is determined whether or not the pressure in the refrigerant circuit (hereinafter referred to as internal pressure) is in the equalized state, and when it is determined that the internal pressure is in the equalized state, each pressure sensor Converts the pressure detected by the above to the saturation temperature. Then, the detection temperature of the ambient temperature sensor is compared with each saturation temperature, and if the difference between them is within the permissible range, it is determined to be normal, and if it is out of the permissible range, it is determined to be a failure.
  • internal pressure the pressure in the refrigerant circuit
  • Patent Document 1 does not clearly indicate the definition of the ambient temperature of the refrigerating apparatus.
  • the ambient temperature is not uniform and varies, when the internal pressure is equalized, the internal pressure is most affected by the lowest ambient temperature and approaches the internal pressure at the lowest temperature. Therefore, if the ambient temperature sensor is provided at a position that is higher than the ambient temperature, the difference between the detection temperature of the ambient temperature sensor and the saturation temperature converted from the internal pressure becomes large. Actually, even though the pressure sensor was not out of order, it was sometimes judged as abnormal. That is, when the ambient temperature varies and the ambient temperature sensor is provided at a position where the ambient temperature is high, it is erroneous to perform an abnormality diagnosis of the pressure sensor using the detected temperature. There was a problem of making a diagnosis.
  • the present disclosure has been made in order to solve the above problems, and an object of the present disclosure is to provide a refrigeration cycle device capable of suppressing an erroneous diagnosis of an abnormality diagnosis of a pressure sensor.
  • the refrigeration cycle device includes a refrigerant circuit in which a compressor, an outdoor heat exchanger, a throttle device, and an indoor heat exchanger are connected by pipes to circulate a refrigerant, and at least one that detects a pressure in the refrigerant circuit.
  • a plurality of temperature sensors for detecting the temperature, the lowest detected temperature among the plurality of the temperature sensors, and the detection pressure of the pressure sensor, it is determined whether or not the pressure sensor is abnormal. It is equipped with a control device for performing the operation.
  • an abnormality diagnosis of a pressure sensor is performed using a temperature sensor that detects the lowest temperature among a plurality of temperature sensors. In this way, erroneous diagnosis can be suppressed by performing an abnormality diagnosis of the pressure sensor using the temperature at which the internal pressure is most affected.
  • FIG. 1 is a diagram showing a configuration of a refrigeration cycle device 1 according to an embodiment.
  • an air conditioner that performs cooling operation and heating operation is exemplified as the refrigeration cycle device 1.
  • the compressor 101, the flow path switching device 102, the outdoor heat exchanger 103, the throttle device 105, and the indoor heat exchanger 106 are connected in a ring shape by a pipe 109, and the refrigerant circulates.
  • the refrigerant circuit 100 is provided.
  • an outdoor fan 104 is provided in the vicinity of the outdoor heat exchanger 103, and an indoor fan 107 is provided in the vicinity of the indoor heat exchanger 106.
  • the refrigeration cycle device 1 according to the embodiment exemplifies an air conditioner having one indoor heat exchanger 106, but the present invention is not limited to this, and a multi air conditioner having a plurality of indoor heat exchangers 106 may be used.
  • the refrigeration cycle device 1 includes a plurality of temperature sensors and a plurality of pressure sensors. Specifically, the refrigeration cycle device 1 includes a discharge temperature sensor 111, a high pressure pressure sensor 112, an outside air temperature sensor 113, a refrigerant temperature sensor 114, an indoor temperature sensor 115, and a low pressure pressure sensor 116. ..
  • the refrigeration cycle device 1 includes a control device 200.
  • the control device 200 includes an operation unit 201, a storage unit 202, an extraction unit 203, a calculation unit 204, a comparison unit 205, a determination unit 206, and a notification unit 207 as functional blocks for diagnosing an abnormality of the pressure sensor. It has.
  • the abnormality diagnosis of the pressure sensor is to determine whether or not the pressure sensor included in the refrigeration cycle device 1 is abnormal.
  • the above-mentioned components of the control device 200 may be provided outside the control device 200 instead of inside the control device 200, or may be provided separately from the control device 200.
  • the compressor 101 is a fluid machine that sucks in a low-temperature low-pressure gas refrigerant, compresses it, and discharges it as a high-temperature, high-pressure gas refrigerant.
  • the compressor 101 operates, the refrigerant circulates in the refrigerant circuit 100.
  • the compressor 101 is, for example, an inverter drive type capable of adjusting the operating frequency. Further, the operation of the compressor 101 is controlled by the control device 200.
  • the flow path switching device 102 is, for example, a four-way valve, and switches between a cooling operation and a heating operation by switching the flow direction of the refrigerant.
  • the switching of the flow path switching device 102 is controlled by the control device 200.
  • a combination of a two-way valve and a three-way valve may be used instead of the four-way valve.
  • the outdoor heat exchanger 103 exchanges heat between the outdoor air and the refrigerant.
  • the outdoor heat exchanger 103 functions as a condenser that dissipates the heat of the refrigerant to the outdoor air and condenses the refrigerant during the cooling operation. Further, the outdoor heat exchanger 103 functions as an evaporator that evaporates the refrigerant during the heating operation and cools the outdoor air by the heat of vaporization at that time.
  • a cross-fin type fin-and-tube heat exchanger composed of a heat transfer tube and a large number of fins is used.
  • the outdoor fan 104 supplies outdoor air to the outdoor heat exchanger 103, and the amount of air blown to the outdoor heat exchanger 103 is adjusted by controlling the rotation speed.
  • a centrifugal fan or a multi-blade fan driven by a motor such as a DC (Direct Current) fan motor or an AC (Alternating Current) fan motor is used.
  • DC fan motor is used as a drive source for the outdoor fan 104
  • the amount of air blown is adjusted by changing the current value and controlling the rotation speed.
  • an AC fan motor is used as a drive source for the outdoor fan 104
  • the amount of air blown is adjusted by controlling the rotation speed by changing the power supply frequency by inverter control.
  • the operation of the outdoor fan 104 is controlled by the control device 200.
  • the throttle device 105 is, for example, an electronic expansion valve capable of adjusting the opening degree of the throttle, and by adjusting the opening degree, the pressure of the refrigerant flowing into the indoor heat exchanger 106 during the cooling operation is controlled. However, during the heating operation, the pressure of the refrigerant flowing into the outdoor heat exchanger 103 is controlled.
  • the opening degree of the aperture device 105 is controlled by the control device 200.
  • the indoor heat exchanger 106 exchanges heat between the indoor air and the refrigerant.
  • the indoor heat exchanger 106 functions as an evaporator that evaporates the refrigerant during the cooling operation and cools the indoor air by the heat of vaporization at that time. Further, the indoor heat exchanger 106 functions as a condenser that dissipates the heat of the refrigerant to the indoor air and condenses the refrigerant during the heating operation.
  • a cross-fin type fin-and-tube heat exchanger composed of a heat transfer tube and a large number of fins is used.
  • the indoor fan 107 supplies indoor air to the indoor heat exchanger 106, and the amount of air blown to the indoor heat exchanger 106 is adjusted by controlling the rotation speed.
  • a centrifugal fan or a multi-blade fan driven by a motor such as a DC (Direct Current) fan motor or an AC (Alternating Current) fan motor is used.
  • DC fan motor is used as the drive source of the indoor fan 107
  • the amount of air blown is adjusted by changing the current value and controlling the rotation speed.
  • an AC fan motor is used as a drive source for the indoor fan 107
  • the amount of air blown is adjusted by controlling the rotation speed by changing the power supply frequency by inverter control.
  • the operation of the indoor fan 107 is controlled by the control device 200.
  • the discharge temperature sensor 111 is provided on the discharge side of the compressor 101, detects the temperature on the discharge side of the compressor 101, and outputs a detection signal to the control device 200.
  • the refrigerant temperature sensor 114 is provided in the pipe 109 constituting the refrigerant circuit 100, detects the temperature of the refrigerant flowing in the pipe 109, and outputs a detection signal to the control device 200.
  • a plurality of refrigerant temperature sensors 114 may be provided at different positions.
  • the outside air temperature sensor (hereinafter, also referred to as the first temperature sensor) 113 is provided at or near the suction port (not shown) of the outdoor heat exchanger 103, detects the temperature of the outdoor space, and controls the detection signal. Output to device 200.
  • the indoor temperature sensor (hereinafter, also referred to as the second temperature sensor) 115 is provided at or near the suction port (not shown) of the indoor heat exchanger 106, detects the temperature of the indoor space, and controls the detection signal. Output to device 200.
  • the high-pressure pressure sensor 112 is provided on the discharge side of the compressor 101, detects the pressure of the high-pressure refrigerant, and outputs a detection signal to the control device 200.
  • the low pressure pressure sensor 116 is provided on the suction side of the compressor 101, detects the pressure of the low pressure refrigerant, and outputs a detection signal to the control device 200.
  • the control device 200 is composed of, for example, dedicated hardware or a CPU (also referred to as a central processing unit, a central processing unit, a processing unit, an arithmetic unit, a microprocessor, or a processor) that executes a program stored in the storage unit 202.
  • a CPU also referred to as a central processing unit, a central processing unit, a processing unit, an arithmetic unit, a microprocessor, or a processor
  • control device 200 When the control device 200 is dedicated hardware, the control device 200 may be, for example, a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. Applicable.
  • Each of the functional units realized by the control device 30 may be realized by individual hardware, or each functional unit may be realized by one hardware.
  • each function executed by the control device 200 is realized by software, firmware, or a combination of software and firmware.
  • the software and firmware are described as programs and stored in the storage unit 202.
  • the CPU realizes each function of the control device 200 by reading and executing the program stored in the storage unit 202.
  • control device 200 may be realized by dedicated hardware, and some may be realized by software or firmware.
  • the control device 200 sets the components of the refrigerating cycle device 1 such as the compressor 101 based on the detection signals from various sensors provided in the refrigerating cycle device 1 and the operation signals from the remote controller (not shown). It controls and controls the operation of the entire refrigeration cycle device 1.
  • the operation unit 201 operates the outdoor fan 104 and the indoor fan 107 when the refrigeration cycle device 1 is stopped to make the detection temperature of each temperature sensor provided in the refrigeration cycle device 1 uniform.
  • each temperature sensor is a discharge temperature sensor 111, a refrigerant temperature sensor 114, an outside air temperature sensor 113, and an indoor temperature sensor 115.
  • the storage unit 202 stores various types of information, and includes, for example, a non-volatile semiconductor memory such as a flash memory, an EPROM, and an EEPROM in which data can be rewritten.
  • the storage unit 202 may also include, for example, a non-volatile semiconductor memory such as a ROM in which data cannot be rewritten, or a volatile semiconductor memory in which data such as RAM can be rewritten.
  • the storage unit 202 stores each data used for abnormality diagnosis of the pressure sensor, such as temperature data and pressure data detected by each of the various sensors.
  • the extraction unit 203 extracts the data necessary for the abnormality diagnosis of the pressure sensor from the data stored in the storage unit 202. Specifically, the extraction unit 203 extracts data on the detection pressure of the pressure sensor that is the target of the abnormality diagnosis and the lowest detection temperature among the detection temperatures of the plurality of temperature sensors.
  • the calculation unit 204 performs necessary calculations based on the data extracted by the extraction unit 203. Specifically, the calculation unit 204 converts the detection pressure extracted by the extraction unit 203 into the saturation temperature.
  • the comparison unit 205 compares the saturation temperature obtained by the calculation by the calculation unit 204 with the detection temperature extracted by the extraction unit 203.
  • the determination unit 206 determines whether or not the pressure sensor, which is the target of the abnormality diagnosis, is abnormal based on the comparison result of the comparison unit 205.
  • the notification unit 207 notifies the abnormality diagnosis result of the pressure sensor.
  • the notification unit 207 includes at least one of a display means for visually notifying information and an audio output means for aurally notifying information.
  • the notification unit 207 is a control board (not shown) or a remote controller having a display unit, and the control board or the remote controller causes the display unit to display whether it is normal or abnormal.
  • the cooling operation will be described.
  • the flow path switching device 102 is switched so that the discharge side of the compressor 101 and the outdoor heat exchanger 103 are connected.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 101 flows into the outdoor heat exchanger 103.
  • the outdoor heat exchanger 103 exchanges heat with the outdoor air supplied by the outdoor fan 104, condenses and becomes a high-pressure liquid refrigerant, and flows out from the outdoor heat exchanger 103.
  • the liquid refrigerant flowing out of the outdoor heat exchanger 103 is decompressed by the throttle device 105, becomes a low-pressure two-layer refrigerant, and flows into the indoor heat exchanger 106.
  • the indoor heat exchanger 106 exchanges heat with the indoor air supplied by the indoor fan 107, evaporates to become a low-temperature low-pressure gas refrigerant, and flows out from the indoor heat exchanger 106.
  • the gas refrigerant flowing out of the indoor heat exchanger 106 is sucked into the compressor 101, where it is discharged again as a high-temperature and high-pressure gas refrigerant.
  • the heating operation will be described.
  • the flow path switching device 102 is switched so that the discharge side of the compressor 101 and the indoor heat exchanger 106 are connected.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 101 flows into the indoor heat exchanger 106.
  • the indoor heat exchanger 106 exchanges heat with the indoor air supplied by the indoor fan 107, condenses and becomes a high-pressure liquid refrigerant, and flows out from the indoor heat exchanger 106.
  • the liquid refrigerant flowing out of the indoor heat exchanger 106 is decompressed by the throttle device 105, becomes a low-pressure two-layer refrigerant, and flows into the outdoor heat exchanger 103.
  • the outdoor heat exchanger 103 exchanges heat with the outdoor air supplied by the outdoor fan 104, evaporates to become a low-temperature low-pressure gas refrigerant, and flows out from the outdoor heat exchanger 103.
  • the gas refrigerant flowing out of the outdoor heat exchanger 103 is sucked into the compressor 101, where it is discharged again as a high-temperature and high-pressure gas refrigerant.
  • FIG. 2 is a diagram showing the characteristics of the pressure sensor of the refrigeration cycle device 1 according to the embodiment.
  • the horizontal axis represents the pressure [MPa] and the vertical axis represents the output voltage [V].
  • the pressure sensor provided in the refrigeration cycle device 1 receives the pressure of the refrigerant with a diaphragm, measures it with a pressure sensitive element via a hydraulic pressure, converts it into an electric signal according to the pressure, and outputs it.
  • the relationship between the electric signal, that is, the output voltage and the pressure is represented by the characteristics shown in FIG.
  • FIG. 3 is a diagram showing a pressure state in the refrigerant circuit 100 when the refrigerating cycle device 1 according to the embodiment is stopped.
  • FIG. 4 is a ph diagram with respect to a plurality of temperatures around the refrigeration cycle apparatus 1 according to the embodiment. Next, the pressure change in the refrigerant circuit 100 when the operation of the refrigeration cycle device 1 according to the embodiment is stopped will be described.
  • the pressure sensor shows a lower detection pressure than in the normal state in the abnormal state, the saturation temperature converted to the detected pressure becomes a value lower than the minimum temperature Tmin. Therefore, when the saturation temperature becomes a value lower than the minimum temperature Tmin, the pressure sensor can determine that it is abnormal.
  • FIG. 5 is a flowchart showing a control flow at the time of abnormality diagnosis of the pressure sensor of the refrigeration cycle device 1 according to the embodiment.
  • the abnormality diagnosis of the pressure sensor it is determined whether or not the pressure sensor included in the refrigeration cycle device 1 is abnormal.
  • the flow of control at the time of abnormality diagnosis of the pressure sensor of the refrigeration cycle device 1 according to the embodiment will be described with reference to FIG.
  • Step S1 The control device 200 determines whether or not the condition for starting the abnormality diagnosis is satisfied.
  • the control device 200 determines that the condition for starting the abnormality diagnosis is satisfied (YES)
  • the process proceeds to step S2.
  • the control device 200 determines that the condition for starting the abnormality diagnosis is not satisfied (NO)
  • the process of step S1 is executed again.
  • the refrigeration cycle device 1 is not in the start / stop operation, but immediately after the operation state is changed to the stop state, that is, immediately after the compressor 101 is stopped. Is. Immediately after stopping the compressor 101 is immediately after the control device 200 receives a stop signal from a remote controller (not shown) or the like, and the control device 200 receives the stop signal to stop the compressor 101. Immediately after. The second is not during the start / stop operation of the refrigeration cycle device 1, but immediately before the state changes from the stopped state to the operating state, that is, immediately before starting the compressor 101. Immediately before starting the compressor 101 is immediately after the control device 200 receives an operation signal from a remote controller (not shown) or the like, and immediately after the control device 200 receives the operation signal and starts the compressor 101. Before.
  • Thermo ON is a state in which the components of the refrigeration cycle device 1 including the compressor 101 are controlled so that the temperature of the indoor space becomes the target temperature.
  • Thermo-OFF is a state in which the temperature of the indoor space is the target temperature, there is no need to exchange heat any more, and the control of the components of the refrigeration cycle device 1 including the compressor 101 is temporarily stopped. be.
  • the control device 200 switches to the thermostat ON.
  • the control device 200 switches the thermostat to OFF.
  • the first threshold value and the second threshold value may be the same value or different values.
  • the refrigerating cycle device 1 determines whether the refrigerating cycle device 1 is in the operating state or the stopped state based on the operating frequency of the compressor 101.
  • the operating frequency F of the compressor 101 is 0 Hz
  • the refrigerating cycle device 1 is in the stopped state
  • the operating frequency F of the compressor 101 is 0 Hz
  • the refrigerating cycle device 1 is in the operating state.
  • the determination as to whether or not the refrigeration cycle device 1 is in the start / stop operation is whether or not the control device 200 is in a state of receiving a stop signal from a remote controller (not shown) installed in the indoor space.
  • the control device 200 when the control device 200 is stopped while receiving the stop signal, the start / stop operation is not in progress, and when the control device 200 is stopped in the state of not receiving the stop signal, the start / stop operation is in progress.
  • the reason why the refrigeration cycle device 1 does not start the abnormality diagnosis during the start / stop operation is to suppress the erroneous diagnosis.
  • Step S2 The control device 200 operates the outdoor fan 104 or the indoor fan 107 to make the ambient temperature of the refrigerating cycle device 1 uniform, thereby making the detection temperature of each temperature sensor provided in the refrigerant circuit 100 uniform.
  • the process proceeds to step S3.
  • the outdoor fan 104 is operated when the temperature of the outdoor space is lower than the temperature of the indoor space, and when the temperature of the indoor space is lower than the temperature of the outdoor space, the outdoor fan 104 is operated.
  • the outdoor fan 104 is operated to equalize the ambient temperature of the refrigeration cycle device 1.
  • the temperature detected by the outside air temperature sensor 113 is compared with the temperature detected by the indoor temperature sensor 115, or the operation mode is cooling operation or heating operation. It is done based on which one it is.
  • Step S3 The control device 200 determines whether the pressure sensor is stable. When the control device 200 determines that the pressure sensor is stable (YES), the process proceeds to step S4. On the other hand, when the control device 200 determines that the pressure sensor is not stable (NO), the process of step S3 is executed again. If the stopped state is released during the determination of whether the pressure sensor is stable and the compressor 101 starts operation, the abnormality diagnosis is stopped.
  • the determination of whether or not the pressure sensor is stable is provided for whether or not the detected pressure of the pressure sensor has changed during the preset first time, or in the space on the fan side during operation. It is performed based on whether or not the detected value of the existing temperature sensor has changed during the preset second time.
  • the space on the operating fan side is an outdoor space when the outdoor fan 104 is operating, and an indoor space when the indoor fan 107 is operating.
  • the pressure sensor moves based on the presence or absence of the movement of the refrigerant in the refrigerant circuit 100. It may be determined whether or not it is stable.
  • the presence or absence of movement of the refrigerant in the refrigerant circuit 100 can be determined, for example, by providing a flow meter in the refrigerant circuit 100 and using the value of the flow meter.
  • the first hour and the second hour may have the same value or different values.
  • the first time may be set based on a response speed that differs depending on the sensor shape of the pressure sensor, the measurement range, and the like.
  • Step S4 The control device 200 extracts the detected pressure of the pressure sensor that is the target of the abnormality diagnosis, and converts the detected pressure into the saturation temperature. After that, the process proceeds to step S5.
  • Step S5 The control device 200 extracts the lowest detected temperature (hereinafter, referred to as the lowest detected temperature) among the detected temperatures of each temperature sensor. After that, the process proceeds to step S6.
  • Step S6 The control device 200 compares the saturation temperature with the minimum detection temperature, and determines whether the saturation temperature is lower than the minimum detection temperature. When the control device 200 determines that the saturation temperature is lower than the minimum detection temperature (YES), the process proceeds to step S7. On the other hand, when the control device 200 determines that the saturation temperature is not lower than the minimum detection temperature (NO), the process proceeds to step S8.
  • Step S7 The control device 200 determines that the pressure sensor that is the target of the abnormality diagnosis is abnormal. After that, the process proceeds to step S9.
  • Step S8 The control device 200 determines that the pressure sensor that is the target of the abnormality diagnosis is normal. After that, the process proceeds to step S9.
  • Step S9 The control device 200 stops the operating fan, that is, stops the outdoor fan 104 when the outdoor fan 104 is operating, and stops the indoor fan 107 when the indoor fan 107 is operating. After that, the process proceeds to step S10.
  • Step S10 The control device 200 stores each data used for the abnormality diagnosis and notifies the abnormality diagnosis result.
  • the refrigeration cycle device 1 includes a refrigerant circuit 100 in which a compressor 101, an outdoor heat exchanger 103, a throttle device 105, and an indoor heat exchanger 106 are connected by a pipe 109 and a refrigerant circulates. .. Further, the refrigeration cycle device 1 includes at least one or more pressure sensors that detect the pressure in the refrigerant circuit 100, and a plurality of temperature sensors that detect the temperature. Further, the refrigeration cycle device 1 includes a control device 200 for diagnosing an abnormality of the pressure sensor by using the lowest detected temperature among the plurality of temperature sensors and the detected pressure of the pressure sensor.
  • an abnormality diagnosis of the pressure sensor is performed using the temperature sensor that detects the lowest temperature among the plurality of temperature sensors. In this way, erroneous diagnosis can be suppressed by performing an abnormality diagnosis of the pressure sensor using the temperature at which the internal pressure is most affected.
  • the refrigeration cycle device 1 includes an indoor fan 107 that supplies air to the indoor heat exchanger 106. Then, when the temperature of the indoor space is lower than the temperature of the outdoor space, the control device 200 operates the indoor fan 107 and then determines whether or not the pressure sensor is abnormal.
  • the refrigeration cycle device 1 includes an outdoor fan 104 that supplies air to the outdoor heat exchanger 103. Then, when the temperature of the outdoor space is lower than the temperature of the indoor space, the control device 200 operates the outdoor fan 104 and then determines whether or not the pressure sensor is abnormal.
  • the outdoor fan 104 is operated when the temperature of the outdoor space is lower than the temperature of the indoor space, and the outdoor fan is operated when the temperature of the indoor space is lower than the temperature of the outdoor space.
  • the temperature around the refrigeration cycle device 1 is made uniform. Then, by equalizing the ambient temperature of the refrigeration cycle device 1 and then extracting the minimum temperature, the accuracy of the abnormality diagnosis of the pressure sensor can be improved.
  • the refrigeration cycle device 1 includes a notification unit 207 for notifying an abnormality of the pressure sensor. Then, the control device 200 determines whether or not the pressure sensor is abnormal, and when the pressure sensor determines that the pressure sensor is abnormal, the notification unit 207 notifies that the pressure sensor is abnormal.
  • the notification unit 207 can notify the user or the like that the pressure sensor is abnormal.
  • the refrigeration cycle device 1 is applied to an air conditioner, but the present invention is not limited to this, and the refrigeration cycle device 1 can be applied to other devices such as a refrigeration device.
  • Refrigeration cycle device 30 control device, 100 refrigerant circuit, 101 compressor, 102 flow path switching device, 103 outdoor heat exchanger, 104 outdoor fan, 105 throttle device, 106 indoor heat exchanger, 107 indoor fan, 109 piping, 111 discharge temperature sensor, 112 high pressure pressure sensor, 113 outside air temperature sensor, 114 refrigerant temperature sensor, 115 indoor temperature sensor, 116 low pressure pressure sensor, 200 control device, 201 operation unit, 202 storage unit, 203 extraction unit, 204 calculation unit, 205 comparison unit, 206 judgment unit, 207 notification unit.

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

Abstract

La présente invention concerne un dispositif à cycle de réfrigération comprenant : un circuit de fluide frigorigène dans lequel un compresseur, un échangeur de chaleur extérieur, un dispositif d'étranglement et un échangeur de chaleur intérieur sont reliés par des tuyaux et dans lequel circule un fluide frigorigène ; au moins un capteur de pression qui détecte la pression dans le circuit de fluide frigorigène ; une pluralité de capteurs de température qui détectent des températures ; et un dispositif de commande qui détermine si le capteur de pression est anormal en utilisant la température détectée la plus basse parmi les températures détectées par la pluralité de capteurs de température et la pression détectée par le capteur de pression.
PCT/JP2020/007888 2020-02-27 2020-02-27 Dispositif à cycle de réfrigération WO2021171448A1 (fr)

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JP2022502688A JP7350151B2 (ja) 2020-02-27 2020-02-27 冷凍サイクル装置
PCT/JP2020/007888 WO2021171448A1 (fr) 2020-02-27 2020-02-27 Dispositif à cycle de réfrigération

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PCT/JP2020/007888 WO2021171448A1 (fr) 2020-02-27 2020-02-27 Dispositif à cycle de réfrigération

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Cited By (1)

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JP2023039065A (ja) * 2021-09-08 2023-03-20 ダイキン工業株式会社 診断システム、診断方法、診断プログラム、及び、空気調和機

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JPH01137175A (ja) * 1987-11-24 1989-05-30 Mitsubishi Heavy Ind Ltd 冷凍装置における圧力センサの故障診断方法
JPH05141822A (ja) * 1991-11-25 1993-06-08 Sanyo Electric Co Ltd 空気調和機における圧力センサの異常検知方法
JP2006266661A (ja) * 2005-02-28 2006-10-05 Mitsubishi Heavy Ind Ltd 冷凍装置およびその運転方法
JP2010223477A (ja) * 2009-03-23 2010-10-07 Sanyo Electric Co Ltd 空気調和装置およびエネルギー機器

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JPH05141822A (ja) * 1991-11-25 1993-06-08 Sanyo Electric Co Ltd 空気調和機における圧力センサの異常検知方法
JP2006266661A (ja) * 2005-02-28 2006-10-05 Mitsubishi Heavy Ind Ltd 冷凍装置およびその運転方法
JP2010223477A (ja) * 2009-03-23 2010-10-07 Sanyo Electric Co Ltd 空気調和装置およびエネルギー機器

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JP2023039065A (ja) * 2021-09-08 2023-03-20 ダイキン工業株式会社 診断システム、診断方法、診断プログラム、及び、空気調和機
JP7348538B2 (ja) 2021-09-08 2023-09-21 ダイキン工業株式会社 診断システム、診断方法、診断プログラム、及び、空気調和機

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