WO2024028946A1 - 冷凍サイクル装置 - Google Patents

冷凍サイクル装置 Download PDF

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Publication number
WO2024028946A1
WO2024028946A1 PCT/JP2022/029493 JP2022029493W WO2024028946A1 WO 2024028946 A1 WO2024028946 A1 WO 2024028946A1 JP 2022029493 W JP2022029493 W JP 2022029493W WO 2024028946 A1 WO2024028946 A1 WO 2024028946A1
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WIPO (PCT)
Prior art keywords
control circuit
power supply
backup power
shutoff valve
circuit
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.)
Ceased
Application number
PCT/JP2022/029493
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English (en)
French (fr)
Japanese (ja)
Inventor
充 澤村
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.)
Carrier Japan Corp
Original Assignee
Toshiba Carrier Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Carrier Corp filed Critical Toshiba Carrier Corp
Priority to PCT/JP2022/029493 priority Critical patent/WO2024028946A1/ja
Priority to US19/100,111 priority patent/US20260022877A1/en
Priority to EP22953936.6A priority patent/EP4567338A1/en
Priority to JP2024538540A priority patent/JP7769127B2/ja
Publication of WO2024028946A1 publication Critical patent/WO2024028946A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F25B49/005—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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
    • F25B2500/222—Detecting refrigerant leaks
    • 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
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves

Definitions

  • Embodiments of the present invention relate to refrigeration cycle devices used in air conditioners and the like.
  • low-GWP refrigerants which have a low Global Warming Potential (GWP)
  • GWP Global Warming Potential
  • A2L refrigerants such as R32, IEC60335 states that for safety purposes, if a device to detect refrigerant leakage is installed, the refrigerant leakage must be stopped. It is necessary to provide a shutoff valve or ventilation fan for this purpose.
  • Patent Documents 1 and 2 disclose that a refrigeration cycle device is equipped with a backup power source as a backup power source, and when a power outage occurs, this backup power source is used to close the shutoff valve. It is stated that the .
  • a backup power source such as a battery cannot supply power inexhaustibly, and in order to close the shutoff valve when refrigerant actually leaks, it is necessary to keep it in a state where it consumes as little power as possible. Therefore, a refrigeration cycle device that can suppress consumption of a backup power source is provided.
  • the refrigeration cycle device of the embodiment includes a cutoff valve that is arranged in a pipe that connects an indoor unit and an outdoor unit that constitute a refrigeration cycle and circulates a refrigerant, and that is opened and closed by the power of an AC power supply.
  • a backup power source capable of supplying power to drive the cutoff valve in place of the alternating current power supply in the event of a power outage
  • an on/off switch disposed in a power supply path from the backup power source to the shutoff valve
  • a control circuit that controls the shutoff valve and the open/close switch
  • a power outage detection unit that detects a power outage of the AC power supply, The control circuit closes the on-off switch to close the cutoff valve when the power outage is detected, and then opens the on-off switch.
  • FIG. 1 is a diagram showing the configuration of a refrigeration cycle system in a first embodiment.
  • FIG. 2 is a functional block diagram showing the detailed configuration of the shutoff valve control device.
  • FIG. 3 is a functional block diagram showing the configuration shown in FIG. 2 divided into two circuit boards.
  • FIG. 4 is a flowchart showing the processing contents in the control circuit.
  • FIG. 5 is a diagram showing an example of changes in cell voltage and battery capacity when charging and discharging are repeated up to 500 cycles at a predetermined temperature for one unit cell that constitutes a backup power source in the second embodiment. be.
  • FIG. 6 is a flowchart showing the processing contents in the control circuit.
  • FIG. 7 is a flowchart showing the processing contents in the control circuit in the second embodiment.
  • the refrigeration cycle device of this embodiment is, for example, an air conditioner consisting of an indoor unit 1 installed indoors, an outdoor unit 2 installed outdoors, and refrigerant pipes 10 and 11 connecting these. be.
  • This air conditioner further includes a shutoff valve device 3 and a refrigerant detection alarm 4 interposed between the refrigerant pipes 10 and 11.
  • the indoor unit 1 includes an indoor control circuit 5, a fan 6, a heat exchanger 7, and an expansion valve 8 which is also a flow rate adjustment valve. Controls the expansion valve 8 that switches the flow.
  • a commercial single-phase or three-phase AC power source 18 is connected to the indoor unit 1, and the indoor control circuit 5, fan 6, and expansion valve 8 operate using this as a power source.
  • the indoor control circuit 5 communicates with an outdoor control circuit (not shown) of the outdoor unit 2 via the communication line 9 .
  • the cutoff valve device 3 includes cutoff valves 12 and 13 for separating the indoor unit 1 from the refrigeration cycle path. Although it is possible to incorporate the shutoff valve device 3 into the indoor unit 1, if it is incorporated, the indoor unit 1 will become larger. For this reason, it is desirable that the shutoff valve device 3 be configured as a separate box and installed in the ceiling or under the floor near the indoor unit 1.
  • the heat exchanger 7 of the indoor unit 1 is connected to the outdoor unit 2 via a liquid-side pipe 10 and a gas-side pipe 11, and a refrigeration cycle is formed by the refrigerant flowing through these pipes.
  • the expansion valve 8 of the indoor unit 1 is arranged on the piping 10 side, which is the liquid side, and uses, for example, a pulse motor valve (PMV) whose opening degree can be adjusted from fully closed to fully open.
  • the opening degree of this expansion valve 8 is controlled by the indoor control circuit 5, and adjusts the pressure and flow rate of the refrigerant flowing into the indoor unit 1.
  • a shutoff valve device 3 is interposed in the pipes 10 and 11 between the indoor unit 1 and the outdoor unit 2.
  • the shutoff valve device 3 is a box installed in the attic or the like.
  • a liquid refrigerant of, for example, R32 is sent from the indoor unit 1 to the indoor unit 1 from the outdoor unit 2 through the piping 10, and exchanges heat with the indoor air in the heat exchanger 7, that is, evaporates and becomes gas.
  • the converted refrigerant returns to the outdoor unit 2 through the pipe 11.
  • the gas refrigerant compressed by the compressor in the outdoor unit 2 to become high pressure flows into the indoor unit 1 through the pipe 11, and exchanges heat with indoor air in the heat exchanger 7. That is, the condensed and liquefied low-pressure refrigerant returns to the outdoor unit 2 through the pipe 11.
  • all indoor units in operation operate in the same operation mode. That is, all the indoor units in operation can only select either the cooling mode or the heating mode.
  • the so-called multi-type in which multiple indoor units 1 are connected in parallel to the refrigerant piping of one outdoor unit 2, is a simultaneous heating and cooling system in which the combination of heating and cooling for each indoor unit 1 can be freely selected.
  • Multi air conditioners also exist. When applied to such a simultaneous cooling/heating multi-air conditioner, the indoor unit 1 and outdoor unit 3 are connected by three pipes, so in addition to the cutoff valves 12 and 13, a cutoff valve is also provided in the middle of the third pipe. There is a need.
  • the shutoff valve device 3 includes shutoff valves 12 and 13 interposed in the pipes 10 and 11, respectively, an open/close indicator lamp 14, a control circuit 15 for controlling these, and a backup power source 16.
  • the control circuit 15 of the shutoff valve device 3 is connected to the indoor control circuit 5 of the indoor unit 1 via a communication bus 17, and communication is performed between the two.
  • the backup power source 16 is composed of, for example, a secondary battery such as a nickel-metal hydride battery.
  • the backup power supply 16 is normally charged by the AC power supply 18 connected to the cutoff valve device 3, and is used to operate the cutoff valve device 3 when a power outage occurs in the AC power supply 18.
  • the on/off state of the open/close indicator lamp 14 is controlled according to the open/closed states of the cutoff valves 12 and 13.
  • the shutoff valves 12 and 13 are electronically controlled valves that control opening and closing of the valves by motor drive, for example, pulse motor valves that can be fully closed. Note that a similar electronic control valve can be used for the expansion valve 8 as well.
  • the refrigerant detection alarm 4 which corresponds to the refrigerant leakage detection section, has two functions: a refrigerant detection function that detects refrigerant leakage from the indoor unit 1, and a notification function that issues an alarm when leakage is detected. . Furthermore, the refrigerant detection alarm 4 includes a gas sensor 19 for detecting a predetermined concentration of refrigerant in the air, an alarm lamp 20, an alarm buzzer 21, a detection state release switch 22, and a control circuit (not shown) for communicating with the indoor unit 1.
  • FIG. 1 shows an example in which the communication path of the refrigerant detection alarm device 4 is directly connected to the communication bus 17 between the control circuit 15 of the cutoff valve device 3 and the indoor control circuit 5 of the indoor unit 1.
  • the refrigerant detection alarm device 4 and the indoor control circuit 5 of the indoor unit 1 are directly connected via another communication path, and the output content from the refrigerant detection alarm device 4 is received via the communication path, and then , may be provided from the indoor control circuit 5 of the indoor unit 1 to the control circuit 15 of the shutoff valve device 3 via the communication bus 17.
  • the control circuit 15 of the cutoff valve device 3 receives an output of refrigerant leakage from the refrigerant detection alarm 4, it operates a valve drive circuit 24 shown in FIG. 3, which will be described later, to fully close the cutoff valves 12 and 13. This prevents the refrigerant sealed in the refrigeration cycle from flowing any further into the leaked indoor unit 1, reducing the amount of refrigerant leakage.
  • the gas sensor 19 When the refrigerant leaks from the pipes 10 and 11 or the indoor unit 1, the gas sensor 19 outputs a leakage detection signal when it detects the refrigerant gas. This causes the alarm lamp 20 to light up and the alarm buzzer 21 to sound. Furthermore, a leakage detection signal is output to the indoor control circuit 5 of the indoor unit 1 and the control circuit 15 of the cutoff valve device 3 via the communication bus 17 .
  • the communication bus 17 also serves as a low-voltage DC power line, and the refrigerant detection alarm device 4 receives power supply for operation from the indoor unit 1 via the communication bus 17.
  • the refrigerant detection alarm 4 is generally installed in an air-conditioned room in which the indoor unit 1 is installed. Note that since the refrigerant detection alarm device 4 is small, the refrigerant detection alarm device 4 may be incorporated inside the indoor unit 1.
  • the refrigerant detection alarm device 4 detects gas, it continues to light the alarm lamp 20, sound the alarm buzzer 21, and send out the leakage detection signal even if the concentration of the gas decreases.
  • a detection state release switch 22 is provided.
  • the alarm lamp 20 goes out, the alarm buzzer 21 stops sounding and the leakage detection signal is stopped, and the refrigerant leakage detection operation starts again.
  • FIG. 2 is a functional block diagram showing the detailed configuration of the shutoff valve device 3.
  • the control circuit 15 corresponding to the control section is composed of, for example, an MCU (Micro Control Unit) and its peripheral circuits.
  • the power supply circuit 23 is an AC-DC converter powered by a commercial power supply 18 that is a single-phase alternating current of 100V or 200V, and generates, for example, a 12V DC power from the input AC power supply 18 to power the valve drive circuit 24 and It is supplied to the charging circuit 25 and the like.
  • the power supply circuit 23 further includes a three-terminal regulator (not shown), which supplies the control circuit 15 with a 5V DC output generated by stepping down the 12V DC power supply.
  • the valve drive circuit 24 outputs a drive signal for opening and closing the cutoff valves 12 and 13, that is, a motor drive signal for opening and closing the valves, in response to a control signal from the control circuit 15.
  • the charging circuit 25 detects the battery voltage of the backup power supply 16, and starts when the voltage drops to a value that requires charging, generates an appropriate current from the 12V DC power supply from the power supply circuit 23, and operates as a backup power supply. Charge 16. In this way, charging of the battery of the backup power source 16 is performed under constant current control. When charging of the backup power supply 16 is completed, the charging circuit 25 ends its operation and stops outputting constant current.
  • a power outage detection circuit 26 corresponding to a power outage detection section includes, for example, a photocoupler, and its input side is connected to the AC power supply 18 and its output side is connected to the control circuit 15. If the AC power supply 18 continues to supply power, the output signal from the power outage detection circuit 26 is continuously input to the control circuit 15 accordingly. When a power outage occurs in the AC power supply 18, input of the output signal to the control circuit 15 is stopped, so that it becomes a power outage detection signal and is input to the control circuit 15 as an interrupt signal.
  • the power source 18 of the indoor unit 1 and the power source 18 of the cutoff valve device 3 may be the same commercial AC power source, or may be separate power sources. If separate power sources are installed for each, it is possible that a power outage for the indoor unit 1 and a power outage for the shutoff valve device 3 may occur separately.
  • Power is supplied from the backup power supply 16 to the DC 12V line via a changeover switch circuit 27 and a power supply circuit 28 that serve as a closing/closing switch for the electric circuit, and the charging circuit 25 and changeover switch circuit 27 are controlled by the control circuit 15. be done. That is, power is supplied to the valve drive circuit 24 via the power supply circuit 23 when the commercial power supply 18 is normal, and power is supplied to the valve drive circuit 24 via the power supply circuit 23 when the commercial power supply 18 is out of power.
  • the charging circuit 25 is also connected to the same 12V DC line, but the charging circuit 25 is connected only when the commercial power supply 18 is operating normally and power is being supplied to the 12V DC line via the power supply circuit 23. , if the battery voltage of the backup power source 16 has decreased, the charging circuit 25 charges the backup power source 16.
  • the changeover switch circuit 27 which corresponds to an open/close switch, is composed of, for example, a MOSFET, and is kept open or in an OFF state while power is being supplied from the power supply 18.
  • a power outage or the like occurs in the power supply 18 and the power supply to the shutoff valve device 3 is stopped, this is detected by the power outage detection circuit 26, and the control circuit 15 closes the changeover switch circuit 27 and turns it into an ON state. Power supply to the control circuit 15 from the backup power supply 16 via the power supply circuit 28 is started.
  • the voltage is, for example, about 8V
  • the power supply circuit 28 boosts the voltage to 12V and supplies it to the valve drive circuit 24, and similarly to the power supply circuit 23, the voltage is increased by a three-terminal regulator or the like.
  • the generated 5V DC power is supplied to the control circuit 15.
  • the 5V DC supplied from the power supply circuit 23 to the control circuit 15 is maintained for a certain period of time by the residual voltage in the capacitor C provided in the power supply path even in the event of a power outage. Therefore, the control circuit 15 continues to operate without stopping until power is supplied to the control circuit 15 from the power supply circuit 28 after a power outage occurs. That is, the power supply to the control circuit 15 is not interrupted before and after a power outage.
  • a power supply path from the power supply circuit 23 and the power supply circuit 28 to the control circuit 15 is shown by a dashed line in FIG. Note that illustration of the open/close indicator lamp 14 is omitted.
  • a discharge circuit 29 for diagnosing deterioration of the battery used in the backup power source 16 is connected between the power supply terminal of the backup power source 16 and the ground.
  • the discharge circuit 29 is composed of a series circuit of a resistance element and a switch circuit, and the opening and closing of the switch circuit is controlled by the control circuit 15.
  • the resistance value of the resistance element is set to be equivalent to the current consumption when the valve drive circuit 24 drives the cutoff valves 12 and 13. Note that the discharge circuit 29 is used in a third embodiment described later.
  • the functional block diagram shown in FIG. 2 shows a case where electric circuits that execute functional blocks other than the backup power supply 16 in the cutoff valve device 3 are mounted on the same board 30. Further, the control circuit 15 is configured to control both the driving of the cutoff valves 12 and 13 and the charging and discharging of the backup power source 16.
  • the functional block diagram of the cutoff valve device 31 shown in FIG. This shows a case where the electric circuit forming the circuit is mounted separately on two substrates 30A and 30B. Accordingly, the functions of the control circuit 15 are also divided into a part for driving the cutoff valves 12 and 13 and a part for controlling charging and discharging of the backup power source 16, which are shown as control circuits 15A and 15B, respectively.
  • the control circuit 15A corresponds to a cutoff valve control circuit
  • the control circuit 15B corresponds to a switch control circuit. That is, the control circuit 15 in FIG. 2 is divided into two parts: a control circuit 15A that controls the cutoff valves 12 and 13, and a control circuit 15B that controls the on/off switch 27.
  • the control circuits 15A and 15B are each equipped with an MCU and communicate with each other, and information such as power outage detected by the control circuit 15A is transmitted to the control circuit 15B side.
  • the power supply paths from the power supply circuit 23 and the power supply circuit 28 to the control circuits 15A and 15B are shown by dashed lines, and even with this circuit configuration, the power supply to the control circuits 15A and 15B will be interrupted before and after a power outage. There is no.
  • This circuit configuration is suitable when the backup power supply 16 and its peripheral circuit are configured as a backup power supply unit separate from the cutoff valve device 3.
  • the cutoff valve device 3 When the backup power supply 16 side, that is, the board 30B equipped with the backup power supply 16 and the changeover switch circuit 27, is separated from the cutoff valve device 3 as a backup power supply unit made of one box, the cutoff valve device 3 This constitutes a shutoff valve device, that is, a shutoff valve unit, which includes only the shutoff valves 12 and 13 and the substrate 30A.
  • a shutoff valve device that is, a shutoff valve unit, which includes only the shutoff valves 12 and 13 and the substrate 30A.
  • the electrical wiring between the board A and the board B in FIG. 3 is connected between the backup power supply unit and the shutoff valve device 3 using a connector, etc. .
  • power can be supplied from the AC power supply 18 via the power supply circuit 23 of the cutoff valve device 3.
  • the same power supply circuit as the power supply circuit 23 is provided on the backup power supply unit side, it is also possible to directly connect the backup power supply unit to the AC power supply 18.
  • the portion surrounded by the two-dot chain line may be configured as the backup power supply unit 40, and the remaining configuration may be configured as a shutoff valve unit.
  • the cutoff valve unit includes a power supply circuit 23, a power failure detection device 26, a control circuit (MCU) 15, a valve drive circuit 24, and cutoff valves 12 and 13.
  • the backup power supply unit 40 includes a power supply circuit 28 , a charging circuit 25 , a changeover switch circuit 27 , a discharge circuit 29 , and a backup power supply 16 . In this case, seven wires are required between the shutoff valve unit and the backup power supply unit 40.
  • the backup power supply unit 40 is configured as an electrical parts box that stores a battery that is the backup power supply 16, and if necessary, this is installed near the shutoff valve unit of the box body, and a connector etc. is used to connect the two.
  • the wiring is connected to form the shutoff valve devices 3 and 31.
  • FIG. 4 shows control when a power outage occurs.
  • the control circuit 15 initializes itself (S1).
  • the cutoff valves 12 and 13 are opened, and the changeover switch circuit 27 is set to OFF.
  • the process waits until a power outage occurs in the AC power source 18 (S2).
  • the shutoff valves 12 and 13 are in an open state when the shutoff valve devices 3 and 31 are shipped from the factory, but if they were closed due to a power outage during the previous operation, etc.
  • the control circuit 15 operates the valve drive circuit 24 using electric power from the power supply circuit 23 to control the cutoff valves 12 and 13 to be fully open.
  • step S2 When a power outage occurs in step S2 (Yes), the system transitions to a stopped state (S3), and the control circuit 15 turns on the changeover switch circuit 27 (S4). Then, power is supplied from the backup power source 16, and the shutoff valves 12 and 13 are closed (S5). When the valve closing operation is completed, the changeover switch circuit 27 is turned off (S6) and the process ends.
  • the completion of the valve closing operation can be determined by a method in which the valve driving circuit 24 notifies the control circuit 15 that the valve closing operation has ended, or by measuring in advance the closing time it takes for both the shutoff valves 12 and 13 to fully close from fully open. There is a method in which the control circuit 15 independently determines that the valve closing time has elapsed since the start of the valve closing operation.
  • the completion of the valve closing operation may be determined.
  • step S3 the control circuit 5 of the indoor unit 1 and the control circuit of the outdoor unit 2 are notified that a power outage has occurred, and the system is stopped. If indoor unit 1 and outdoor unit 2 are connected to the same AC power supply 18, each device will experience a power outage in the same way, so when a power outage occurs, the entire air conditioner will already have stopped, but indoor unit 1 If the indoor unit 1 or the outdoor unit 2 is receiving power from an AC power source different from the shutoff valve device 3, the device is operable. The system notifies the control circuit of the air conditioner that a power outage has occurred and stops operating the air conditioner.
  • the pipes 10 and 11 are arranged in the air conditioner to connect the indoor unit 1 and the outdoor unit 2 and circulate the refrigerant, and are opened and closed by the power of the AC power supply 18.
  • a backup power supply 16 capable of supplying power to the cutoff valve drive circuit 24 in place of the cutoff valves 12 and 13, the cutoff valve drive circuit 24, and the AC power supply 18 in the event of a power outage, and power supply from the backup power supply 16 to the cutoff valve drive circuit 24.
  • It includes a changeover switch circuit 27 arranged in the path, a control circuit 15 that controls the cutoff valves 12 and 13 and the changeover switch circuit 27, and a power outage detection circuit 26 that detects a power outage of the AC power supply 18. When a power outage is detected, the control circuit 15 closes the normally open changeover switch circuit 27 and closes the cutoff valves 12 and 13. Then, the changeover switch circuit 27 was opened.
  • the changeover switch circuit 27 In an air conditioner equipped with a backup power supply, if the changeover switch circuit 27 is not present, the backup power supply and the power supply circuit are directly connected. Therefore, the power of the backup power source is always consumed by peripheral circuits such as a power supply circuit and a voltage detection circuit (not shown), although it is a small amount. Batteries used as backup power sources deteriorate due to the number of times they are charged and discharged. Therefore, in the cutoff valve device 3 of this embodiment, when a power outage occurs and the cutoff valves 12 and 13 are closed, the changeover switch circuit 27 is turned OFF to electrically connect between the backup power supply 16 and the power supply circuit 28. disconnect.
  • control circuit 15 including an MCU and the like to which power is supplied from the power supply circuit 28 is also stopped, and no signal is generated between the control circuit 15 and the backup power supply 16.
  • unnecessary consumption of the battery of the backup power source 16 can be suppressed as much as possible, so deterioration of the backup power source 16 can be suppressed.
  • step S1 shown in FIG. 4 the changeover switch circuit 27 is set to OFF by initializing the control circuit 15.
  • the second embodiment adds deterioration diagnosis processing for the backup power supply 16 to the control of the first embodiment.
  • the backup power supply 16 is made up of a plurality of unit cells of nickel-metal hydride batteries connected in series, and the voltage of the unit cells in a fully charged state is around 1.3V.
  • Figure 5 shows the changes in cell voltage and battery capacity when one unit cell is cycled up to 500 times at a predetermined temperature, with one cycle of charging for one unit, resting for one hour, discharging one unit, and resting for one hour.
  • An example is shown. It is assumed that the battery capacity when repeated up to 500 cycles is 80%, and the battery capacity required to close the cutoff valves 12 and 13 is also 80%. The cell voltage at that time was a little over 1.0V. Therefore, the voltage of 1.0V is set as the threshold value for determining the deterioration of the backup power supply 16.
  • the control circuit 15 executes steps S1 to S4, and determines whether the backup power source 16 is fully charged immediately after turning on the changeover switch after the power failure occurs in step S4 (S11).
  • step Send does not exist as a control because the supply of power to the control circuit 15 itself is stopped by turning off the changeover switch, but it is expressed as a step for convenience of explanation.
  • a valve closing operation is executed (S5), and the voltage of the backup power supply 16 after the valve closing operation is measured (S13). If the measured voltage is 1.0 V or more (S14; YES), it is determined that the backup power supply 16 has not deteriorated, and the changeover switch circuit 27 is then turned off (S6) to end the process (Send). If the measured voltage is less than 1.0V (NO), it is determined that the backup power supply 16 has deteriorated (S15). Then, the control circuit 15 stores the status of the deterioration determination in the memory (S16), and then turns off the changeover switch circuit 27 (S6) to end the process (Send).
  • step S1 S17
  • step S17 the control circuit 15 initializes in the same manner as step S1 (S17), and then changes the status of the deterioration determination stored in the memory to "deteriorated". If the information is, an alarm is output to notify the deterioration of the backup power supply 16. On the other hand, if no deterioration information is stored in the memory, it is in a normal state and the process moves to step S2 without any particular notification.
  • the control circuit 15 performs the valve closing operation. In parallel, it is determined whether the backup power supply 16 has deteriorated. Thereby, deterioration determination can be performed efficiently.
  • the discharge circuit 29 is forcibly used to perform deterioration diagnosis processing of the backup power source 16.
  • This deterioration diagnosis process is performed while the power supply 18 is energized.
  • the certain period of time is set to about one month, for example. If the certain period of time has not elapsed (NO), the process ends without performing the deterioration diagnosis (S22).
  • steps S4 and S11 are executed, and then the switch circuit of the discharge circuit 29 is turned on (S23), and the backup power supply 16 is turned on and the shutoff valves 12 and 13 are closed.
  • the battery is forcibly discharged with a current consumption of (S24).
  • steps S13 to S15 are executed as in the second embodiment.
  • step S18 it is notified that the battery of the backup power supply 16 has deteriorated, and the state is stored in the memory.
  • the changeover switch is turned OFF to complete the deterioration diagnosis process.
  • the user recognizes the deterioration notification of the backup power source 16 in step S18, requests the maintenance worker to replace the battery of the backup power source 16, and the maintenance worker replaces the battery of the backup power source 16 with a new one.
  • the control circuit 15 causes the discharge circuit 29 to discharge the backup power supply 16 to perform deterioration diagnosis when a period in which a power outage of the AC power supply 18 is not detected reaches a predetermined length.
  • the health of the backup power source 16 can be checked at least every time a predetermined period of time has elapsed, thereby avoiding a situation where the shutoff valves 12 and 13 cannot be closed due to a lack of power in the backup power source 16 when a power outage occurs. can.
  • the shutoff valve is not limited to an electronically controlled valve driven by a motor, but may be any valve that can be opened and closed using electric power.
  • the changeover switch circuit is not limited to MOSFET, and may be a mechanical relay that drives contacts.
  • the cell voltage threshold for deterioration diagnosis is not limited to 1.0V and may be changed as appropriate.
  • the predetermined period at which deterioration diagnosis is performed is not limited to one month, but is preferably one month or more, since frequent forced discharge during deterioration diagnosis will itself lead to deterioration of the battery of backup power supply 16. A long period of time is desirable.
  • the backup power source is not limited to a nickel metal hydride battery, but may also be a lithium ion battery, for example.
  • 1 is an indoor unit
  • 2 is an outdoor unit
  • 3 and 31 are cutoff valve devices
  • 4 is a refrigerant leak detector (refrigerant leak detector)
  • 10 and 11 are refrigerant pipes
  • 15, 15A, and 15B are control circuits.
  • 16 is a backup power supply
  • 24 is a valve drive circuit
  • 27 is a changeover switch circuit (open/close switch)
  • 29 is a discharge circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Stand-By Power Supply Arrangements (AREA)
PCT/JP2022/029493 2022-08-01 2022-08-01 冷凍サイクル装置 Ceased WO2024028946A1 (ja)

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PCT/JP2022/029493 WO2024028946A1 (ja) 2022-08-01 2022-08-01 冷凍サイクル装置
US19/100,111 US20260022877A1 (en) 2022-08-01 2022-08-01 Refrigeration cycle device
EP22953936.6A EP4567338A1 (en) 2022-08-01 2022-08-01 Refrigeration cycle device
JP2024538540A JP7769127B2 (ja) 2022-08-01 2022-08-01 冷凍サイクル装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025205640A1 (ja) * 2024-03-29 2025-10-02 株式会社富士通ゼネラル 空気調和機
WO2025205523A1 (ja) * 2024-03-29 2025-10-02 株式会社富士通ゼネラル 空気調和機
WO2025246977A1 (zh) * 2024-05-28 2025-12-04 广东美的暖通设备有限公司 暖通系统及其电控系统

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Publication number Priority date Publication date Assignee Title
JPH1172262A (ja) * 1997-08-29 1999-03-16 Daikin Ind Ltd 空気調和装置
JP2013210110A (ja) * 2012-03-30 2013-10-10 Hitachi Appliances Inc 空気調和機
WO2018078729A1 (ja) 2016-10-25 2018-05-03 三菱電機株式会社 冷凍サイクル装置
WO2020110425A1 (ja) * 2018-11-26 2020-06-04 日立ジョンソンコントロールズ空調株式会社 空気調和システム及び冷媒漏洩防止システム
JP2020134005A (ja) 2019-02-19 2020-08-31 パナソニックＩｐマネジメント株式会社 空気調和装置
JP2021191980A (ja) * 2020-05-13 2021-12-16 ダイキン工業株式会社 ヒートポンプ装置
WO2022038708A1 (ja) * 2020-08-19 2022-02-24 三菱電機株式会社 空気調和装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1172262A (ja) * 1997-08-29 1999-03-16 Daikin Ind Ltd 空気調和装置
JP2013210110A (ja) * 2012-03-30 2013-10-10 Hitachi Appliances Inc 空気調和機
WO2018078729A1 (ja) 2016-10-25 2018-05-03 三菱電機株式会社 冷凍サイクル装置
WO2020110425A1 (ja) * 2018-11-26 2020-06-04 日立ジョンソンコントロールズ空調株式会社 空気調和システム及び冷媒漏洩防止システム
JP2020134005A (ja) 2019-02-19 2020-08-31 パナソニックＩｐマネジメント株式会社 空気調和装置
JP2021191980A (ja) * 2020-05-13 2021-12-16 ダイキン工業株式会社 ヒートポンプ装置
WO2022038708A1 (ja) * 2020-08-19 2022-02-24 三菱電機株式会社 空気調和装置

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025205640A1 (ja) * 2024-03-29 2025-10-02 株式会社富士通ゼネラル 空気調和機
WO2025205523A1 (ja) * 2024-03-29 2025-10-02 株式会社富士通ゼネラル 空気調和機
JP2025153021A (ja) * 2024-03-29 2025-10-10 株式会社富士通ゼネラル 空気調和機
JP2025153020A (ja) * 2024-03-29 2025-10-10 株式会社富士通ゼネラル 空気調和機
JP7758087B2 (ja) 2024-03-29 2025-10-22 株式会社富士通ゼネラル 空気調和機
JP7775543B2 (ja) 2024-03-29 2025-11-26 株式会社富士通ゼネラル 空気調和機
WO2025246977A1 (zh) * 2024-05-28 2025-12-04 广东美的暖通设备有限公司 暖通系统及其电控系统

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US20260022877A1 (en) 2026-01-22
JPWO2024028946A1 (https=) 2024-02-08
EP4567338A1 (en) 2025-06-11
JP7769127B2 (ja) 2025-11-12

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