WO2021199163A1 - 空気調和システム - Google Patents

空気調和システム Download PDF

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Publication number
WO2021199163A1
WO2021199163A1 PCT/JP2020/014568 JP2020014568W WO2021199163A1 WO 2021199163 A1 WO2021199163 A1 WO 2021199163A1 JP 2020014568 W JP2020014568 W JP 2020014568W WO 2021199163 A1 WO2021199163 A1 WO 2021199163A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
unit
indoor
leakage
command signal
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/JP2020/014568
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
幸治 山口
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to DE112020007002.6T priority Critical patent/DE112020007002T5/de
Priority to JP2022512904A priority patent/JP7330363B2/ja
Priority to PCT/JP2020/014568 priority patent/WO2021199163A1/ja
Priority to US17/796,004 priority patent/US12235029B2/en
Priority to GB2211658.6A priority patent/GB2607499B/en
Priority to CN202080098994.9A priority patent/CN115349073B/zh
Publication of WO2021199163A1 publication Critical patent/WO2021199163A1/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
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • 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

Definitions

  • the present disclosure relates to an air conditioning system that has a plurality of indoor units and circulates a refrigerant to perform air conditioning.
  • a flammable refrigerant having a small global warming potential such as R32 has been proposed in place of R410A, which has a high global warming potential.
  • the flammable refrigerant may leak from the inside of the indoor unit or a part connected to the indoor unit. Since many flammable refrigerants have a higher specific gravity than air, if they leak, they tend to stay around the floor in the room or inside the indoor unit, and are difficult to diffuse.
  • Patent Document 1 describes an air conditioning system in which an outdoor unit and a plurality of indoor units are communicably connected, and each indoor unit is provided with a refrigerant leakage sensor for detecting refrigerant leakage. ..
  • the air conditioning system stops operation when the refrigerant leak sensor detects a refrigerant leak. As a result, further leakage of the refrigerant is suppressed.
  • the refrigerant leakage sensor in the air conditioning system needs to be changed when the type of refrigerant is changed, the characteristics of the refrigerant leakage sensor are changed, or when it is necessary to replace the refrigerant due to aging deterioration. ..
  • the burden of changing the refrigerant leakage sensor for each indoor unit increases.
  • the present disclosure has been made to solve the above problems, and an object of the present disclosure is to provide an air conditioning system that reduces the burden of changing the refrigerant leakage sensor.
  • the air conditioning system is an outdoor unit that exchanges heat between outdoor air and the refrigerant in a refrigerant circuit that circulates a refrigerant, and an outdoor unit that exchanges heat between the refrigerant and the indoor air in the refrigerant circuit. It has a plurality of indoor units that exchange heat to air-condition the room, and one or more refrigerant leakage sensors that detect the leakage of the refrigerant from the refrigerant circuit.
  • the refrigerant leakage sensor is the outdoor unit. It is arranged separately from the machine and the plurality of indoor units.
  • the air conditioning system since one or more refrigerant leakage sensors are arranged separately from the outdoor unit and the indoor unit, the work on the outdoor unit and the indoor unit when the refrigerant leakage sensor is changed is performed. The need is eliminated, and the burden of changing the refrigerant leakage sensor can be reduced.
  • FIG. 1 is a schematic diagram showing an example of an air conditioning system according to an embodiment.
  • the air conditioning system 100 includes an outdoor unit 1, a plurality of indoor units 2, and one or more shutoff valve units 3.
  • the outdoor unit 1, the plurality of indoor units 2, and the shutoff valve unit 3 are connected to each other via a refrigerant pipe 7 for circulating a refrigerant inside.
  • the refrigerant circulates in the outdoor unit 1 and each indoor unit 2.
  • the circuit in which the refrigerant circulates in this way is referred to as the refrigerant circuit 4.
  • the refrigerant is filled in the outdoor unit 1, but may be further added depending on the number of indoor units 2 connected to the outdoor unit 1 and the length of the refrigerant pipe 7. Therefore, a larger amount of refrigerant than that fills the outdoor unit 1 may be sealed in the refrigerant circuit 4.
  • the refrigerant in the embodiment is, for example, a single HFO-1234yf refrigerant, a mixed HFO-1234yf refrigerant, a hydrocarbon-based refrigerant such as propane, or the like.
  • the outdoor unit 1 includes a compressor 10, a flow path switching device 11, an outdoor heat exchanger 12, an outdoor blower 13, and an outdoor flow rate adjusting valve 14.
  • the compressor 10, the flow path switching device 11, the outdoor heat exchanger 12, and the outdoor flow rate adjusting valve 14 are sequentially connected by a refrigerant pipe 7.
  • the compressor 10 compresses the refrigerant sucked from the suction side and discharges it from the discharge side as a high-temperature and high-pressure gas refrigerant.
  • the flow path switching device 11 includes, for example, a four-way valve, and switches the direction of the flow path of the refrigerant. Switching between cooling and heating is performed by switching the flow path of the refrigerant by the flow path switching device 11.
  • the solid line portion in the flow path switching device 11 indicates the flow path of the refrigerant during the cooling operation.
  • the broken line portion indicates the flow path of the refrigerant during the heating operation.
  • the arrow indicated by the solid line in FIG. 1 indicates the direction in which the refrigerant flows during the cooling operation
  • the arrow indicated by the broken line indicates the direction in which the refrigerant flows during the heating operation.
  • the outdoor heat exchanger 12 exchanges heat between the refrigerant and the outdoor air.
  • the outdoor heat exchanger 12 functions as a refrigerant condenser during the cooling operation and as a refrigerant evaporator during the heating operation.
  • the outdoor blower 13 includes a propeller fan driven by a drive source such as a fan motor (not shown), guides the outdoor air to the outdoor heat exchanger 12 in the outdoor unit 1, and guides the air after heat exchange with the refrigerant to the outside. Send to.
  • the outdoor flow rate adjusting valve 14 is also called an expansion valve, and adjusts the flow rate of the refrigerant circulating between the outdoor unit 1 and the indoor unit 2 by changing the opening degree, or the refrigerant compressed by the compressor 10. Is decompressed.
  • the opening degree of the outdoor flow rate adjusting valve 14 in the embodiment is adjusted according to the operating condition of the indoor unit 2.
  • the outdoor flow rate adjusting valve 14 may be provided in the shutoff valve unit 3, which will be described later, instead of the outdoor unit 1.
  • the outdoor flow rate adjusting valve 14 may be included in each of the outdoor unit 1 and the shutoff valve unit 3.
  • the indoor unit 2 includes an indoor heat exchanger 20, an indoor blower 21, an indoor flow rate adjusting valve 22, a notification unit 23, and an indoor control unit 24.
  • the notification unit 23 may be included in a remote controller (not shown) of the indoor unit 2.
  • the indoor heat exchanger 20 exchanges heat between the refrigerant from the outdoor unit 1 and the indoor air.
  • the indoor heat exchanger 20 exchanges heat between the air sent from the room to the inside of the indoor unit 2 by the indoor blower 21 and the refrigerant.
  • the indoor blower 21 includes a propeller fan (not shown) driven by, for example, a fan motor, guides the indoor air to the indoor heat exchanger 20 in the indoor unit 2, and brings the air after heat exchange with the refrigerant into the room. And send it out.
  • the indoor flow rate adjusting valve 22 is also called an expansion valve, and adjusts the flow rate of the refrigerant circulating between the outdoor unit 1 and the indoor unit 2 by changing the opening degree. For example, when the refrigerant leaks, the notification unit 23 notifies according to the instruction of the indoor control unit 24, which will be described later.
  • the indoor control unit 24 controls the indoor blower 21, the indoor flow rate adjusting valve 22, the notification unit 23, and the like.
  • the indoor control unit 24 causes the outdoor unit 1, the indoor unit 2, and the like to perform the air conditioning operation desired by the user according to an instruction received from a remote controller (not shown).
  • the indoor control unit 24 transmits a signal to be transmitted to the outdoor unit 1 and other components of the indoor unit 2 including the indoor control unit 24 in order to perform the air conditioning operation desired by the user. , Described as a control signal.
  • the shutoff valve unit 3 in the embodiment is a unit provided in the refrigerant circuit 4 including each of one or more indoor units 2 in the same room.
  • the shutoff valve unit 3 is provided between the outdoor unit 1 and one or more indoor units 2 in the refrigerant circuit 4.
  • the shutoff valve unit 3 includes a plurality of shutoff valves 30 and an information processing unit 31.
  • the shutoff valve unit 3 in the embodiment accommodates a plurality of shutoff valves 30 and an information processing unit 31 inside the housing.
  • the shutoff valve 30 is provided in the refrigerant circuit 4 between the outdoor unit 1 and the indoor unit 2.
  • the shutoff valve 30 causes the refrigerant to flow in the refrigerant circuit 4 between the outdoor unit 1 and the indoor unit 2 by the opening operation. Further, the shutoff valve 30 shuts off the flow of the refrigerant in the refrigerant circuit 4 between the outdoor unit 1 and the indoor unit 2 by the closing operation.
  • the shutoff valve unit 3 in the embodiment includes a plurality of shutoff valves 30 provided between the outdoor unit 1 and one or more indoor units 2 in one room. However, the shutoff valve unit 3 may include a plurality of shutoff valves 30 provided between the plurality of indoor units 2 and the outdoor unit 1 in the plurality of chambers.
  • the information processing unit 31 transmits / receives data to / from one or more refrigerant leakage sensors 5.
  • the one or more refrigerant leakage sensors 5 are installed in the same room as the one or more indoor units 2 connected to the shutoff valve unit 3. Further, the information processing unit 31 communicates with the indoor control unit 24 in each of the one or more indoor units 2 and communicates with the outdoor unit 1.
  • the refrigerant leakage sensor 5 may be included in the shutoff valve unit 3. In this case, the shutoff valve unit 3 is installed in the same room as the one or more indoor units 2.
  • the indoor unit 2 and the refrigerant leakage sensor 5 installed in one room and the shutoff valve 30 provided between the indoor unit 2 and the outdoor unit 1 are grouped together. It is assumed that Then, in the embodiment, it is assumed that the shutoff valve 30 in one group is housed in the shutoff valve unit 3.
  • the information processing unit 31 may communicate with each of one or more refrigerant leakage sensors 5 by wire or wirelessly.
  • the information processing unit 31 performs wireless communication with the indoor control unit 24 and the outdoor unit 1, but may perform wired communication.
  • the refrigerant leakage sensor 5 is a sensor that detects the occurrence of an event in which the refrigerant leaks from the refrigerant circuit 4.
  • Examples of the refrigerant leakage sensor 5 include sensors such as an oxygen concentration type and a flammable gas detection type.
  • the information processing unit 31 When the refrigerant leakage sensor 5 detects the leakage of the refrigerant, the information processing unit 31 receives a signal indicating the leakage of the refrigerant from the refrigerant leakage sensor 5. Upon receiving the signal, the information processing unit 31 performs a pre-programmed operation on the plurality of shutoff valves 30 in the shutoff valve unit 3, the outdoor unit 1, and one or more indoor units 2 connected to the shutoff valve unit 3. Therefore, a signal instructing the operation when a refrigerant leak occurs is transmitted. In the following, it is assumed that a predetermined signal for commanding the operation when a refrigerant leak occurs may be referred to as a command signal.
  • the information processing unit 31 When the information processing unit 31 receives a signal indicating a refrigerant leak from at least one refrigerant leak sensor 5, all the shutoff valves 30 in the shutoff valve unit 3 and all connected to the shutoff valve unit 3 are connected. A command signal is transmitted to the indoor unit 2 and the outdoor unit 1 of the above.
  • one shutoff valve unit 3 includes a plurality of shutoff valves 30 provided between the outdoor unit 1 and the plurality of indoor units 2 in the plurality of rooms
  • the information processing unit 31 may be used. It communicates with the refrigerant leakage sensor 5 in each of the plurality of rooms.
  • the information processing unit 31 stores the refrigerant leakage sensor 5, the indoor unit 2, and the shutoff valve 30 in groups for each room or for each of a plurality of rooms adjacent to each other.
  • the information processing unit 31 receives a signal indicating the leakage of the refrigerant from the refrigerant leakage sensor 5 installed in any one room, the information processing unit 31 and all the indoor units 2 of the same group as the refrigerant leakage sensor 5 and A command signal is transmitted to all the shutoff valves 30 and the outdoor unit 1.
  • the shutoff valve 30 When the shutoff valve 30 receives the command signal, the shutoff valve 30 closes the valve to shut off the flow of the refrigerant. As a result, the inflow of the refrigerant into the indoor unit 2 is suppressed. On the other hand, the shutoff valve 30 opens and closes the valve in response to the control signal while the command signal is not received. The refrigerant circulates when the shutoff valve 30 is opened, and the flow is cut off when the shutoff valve 30 is closed.
  • the indoor control unit 24 in the indoor unit 2 that has received the command signal causes the indoor blower 21 in the indoor unit 2 to perform a process for diffusing the leaked refrigerant in response to the command signal. Specifically, the indoor control unit 24 controls the indoor blower 21 so as to start the operation if the indoor blower 21 has not been operated before receiving the command signal. On the other hand, if the indoor blower 21 is operating before receiving the command signal, the indoor control unit 24 controls the indoor blower 21 so as to increase the air volume, for example. The refrigerant is diffused by the operation by the indoor blower 21.
  • the indoor control unit 24 that has received the command signal controls the notification unit 23 in the indoor unit 2 including the indoor control unit 24 so as to issue an alarm. Further, the indoor control unit 24 that has received the command signal controls the indoor flow rate adjusting valve 22 in the indoor unit 2 so as to close the valve. In the embodiment, the indoor control unit 24 that has received the command signal does not transmit the control signal to the outdoor unit 1.
  • the outdoor unit 1 when the outdoor unit 1 receives the command signal, the outdoor unit 1 controls the compressor 10 to stop the operation in response to the command signal so that the refrigerant does not flow out to the indoor unit 2 side. Therefore, the outdoor flow rate adjusting valve 14 is controlled so as to close the valve.
  • the outdoor unit 1 in the embodiment receives a control signal from the indoor unit 2 together with the command signal, the outdoor unit 1 preferentially executes an operation based on the command signal. That is, when the outdoor unit 1 receives at least one command signal, the operation of the compressor 10 is stopped and the outdoor flow rate adjusting valve 14 is closed.
  • FIG. 2 is a schematic diagram for explaining the operation of the air conditioning system when one or more indoor units are installed in each room.
  • FIG. 2 shows an example in which three indoor units 2 are installed in the room A and one indoor unit 2 is installed in the room B.
  • the shutoff valves 30 in the refrigerant circuit 4 including each of one or more indoor units 2 in one room are grouped. Therefore, the shutoff valve 30 in the refrigerant circuit 4 including each of the three indoor units 2 in the room A and the shutoff valve 30 in the refrigerant circuit 4 including one indoor unit 2 in the room B belong to different groups. ..
  • FIG. 1 In the example shown in FIG.
  • shutoff valve 30 and the refrigerant leak sensor 5 are included in one shutoff valve unit 3 for each group. Therefore, the shutoff valve 30 in the refrigerant circuit 4 including each of the three indoor units 2 in the room A is housed in one shutoff valve unit 3 and shuts off in the refrigerant circuit 4 including one indoor unit 2 in the room B. It is assumed that the valve 30 is housed in another shutoff valve unit 3. However, one shutoff valve unit 3 may include a plurality of groups of shutoff valves 30 and a refrigerant leak sensor 5.
  • shutoff valve unit 3 including the shutoff valve 30 in the refrigerant circuit 4 including each of the three indoor units 2 in the chamber A will be referred to as a shutoff valve unit 3A.
  • the shutoff valve unit 3 including the shutoff valve 30 in the refrigerant circuit 4 including one indoor unit 2 in the chamber B is referred to as a shutoff valve unit 3B.
  • a refrigerant leak sensor 5 is installed in the room A.
  • the refrigerant leakage sensor 5 may be housed in the shutoff valve unit 3A.
  • the refrigerant leakage sensor 5 installed in the room A may be referred to as a refrigerant leakage sensor 5A.
  • the refrigerant leak sensor 5A communicates with the information processing unit 31 included in the shutoff valve unit 3A.
  • the information processing unit 31 included in the shutoff valve unit 3A may be referred to as the information processing unit 31A.
  • a refrigerant leakage sensor 5 is installed in the room B.
  • the refrigerant leakage sensor 5 may be housed in the shutoff valve unit 3B.
  • the refrigerant leakage sensor 5 installed in the room B may be referred to as a refrigerant leakage sensor 5B.
  • the refrigerant leak sensor 5B communicates with the information processing unit 31 included in the shutoff valve unit 3B.
  • the information processing unit 31 included in the shutoff valve unit 3B may be referred to as an information processing unit 31B.
  • the information processing unit 31A communicates with each indoor control unit 24 of the three indoor units 2 installed in the room A.
  • the information processing unit 31B communicates with the indoor control unit 24 of one indoor unit 2 installed in the room B.
  • the refrigerant leakage sensor 5A detects the leakage of the refrigerant
  • the refrigerant leakage sensor 5A transmits a signal indicating the leakage of the refrigerant to the information processing unit 31A.
  • the information processing unit 31A transmits a command signal to the shutoff valve 30 included in the shutoff valve unit 3A to close the valve.
  • the shutoff valve 30 included in the shutoff valve unit 3A closes the valve according to the command signal.
  • the outdoor flow rate adjusting valve 14 is provided in the shutoff valve unit 3A
  • the information processing unit 31A transmits a command signal to the outdoor flow rate adjusting valve 14 to close the valve. In this case, the outdoor flow rate adjusting valve 14 closes the valve according to the command signal.
  • the information processing unit 31A transmits a command signal to each indoor control unit 24 of the three indoor units 2 installed in the room A.
  • the indoor control unit 24 controls the notification unit 23 to issue an alarm, controls the indoor blower 21 to blow air to diffuse the leaked refrigerant, and closes the indoor flow rate adjusting valve. 22 is controlled.
  • the refrigerant leakage sensor 5B detects the leakage of the refrigerant
  • the refrigerant leakage sensor 5B transmits a signal indicating the leakage of the refrigerant to the information processing unit 31B.
  • the information processing unit 31B transmits a command signal to the shutoff valve 30 included in the shutoff valve unit 3B to close the valve.
  • the shutoff valve 30 included in the shutoff valve unit 3B closes the valve according to the command signal.
  • the outdoor flow rate adjusting valve 14 is provided in the shutoff valve unit 3B
  • the information processing unit 31B transmits a command signal to the outdoor flow rate adjusting valve 14 to close the valve. In this case, the outdoor flow rate adjusting valve 14 closes the valve according to the command signal.
  • the information processing unit 31B transmits a command signal to each indoor control unit 24 of one indoor unit 2 installed in the room B.
  • the indoor control unit 24 controls the notification unit 23 to issue an alarm, controls the indoor blower 21 to blow air to diffuse the leaked refrigerant, and closes the indoor flow rate adjusting valve. 22 is controlled.
  • the information processing unit 31A and the information processing unit 31B When the information processing unit 31A and the information processing unit 31B receive the signal indicating the leakage of the refrigerant, they transmit a command signal to the outdoor unit 1.
  • the outdoor unit 1 controls the compressor 10 to stop the operation and controls the outdoor flow rate adjusting valve 14 so as to close the valve in response to the received command signal.
  • one shutoff valve unit 3 includes the shutoff valve 30 in the refrigerant circuit 4 including the indoor unit 2 in the chamber A and the chamber B
  • the information processing unit 31 included in the shutoff valve unit 3 Communicate with the indoor control unit 24 in the indoor unit 2 arranged in the indoor A and the indoor B. Then, when the information processing unit 31 receives a signal indicating the leakage of the refrigerant from the refrigerant leakage sensor 5A, the information processing unit 31 transmits a command signal to the outdoor unit 1 and also transmits the indoor unit 2 and the shutoff valve in the same group as the refrigerant leakage sensor 5A. A command signal is transmitted to 30.
  • the information processing unit 31 when the information processing unit 31 receives a signal indicating the leakage of the refrigerant from the refrigerant leakage sensor 5B, the information processing unit 31 transmits a command signal to the outdoor unit 1 and also shuts off the indoor unit 2 in the same group as the refrigerant leakage sensor 5B. A command signal is transmitted to the valve 30.
  • Each function of the information processing unit 31 and the indoor control unit 24 includes, for example, a processor such as a CPU (Central Processing Unit) or MPU (Micro Processing Unit) and a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory). It can be realized by a configuration including a communication interface circuit and the like.
  • a processor such as a CPU (Central Processing Unit) or MPU (Micro Processing Unit)
  • a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory). It can be realized by a configuration including a communication interface circuit and the like.
  • Each communication function of the information processing unit 31 and the indoor control unit 24 can be realized by using a communication interface circuit. Functions other than the communication function by the information processing unit 31 can be realized by the processor reading and executing various programs stored in the memory. Similarly, functions other than the communication function by the indoor control unit 24 can be realized by the processor reading and executing various programs stored in the memory. Each function by the information processing unit 31 and the indoor control unit 24 may be realized in whole or in part by dedicated hardware.
  • FIG. 3 is a sequence diagram showing an example of the processing flow in the air conditioning system when the refrigerant is detected in the room.
  • the indoor unit 2 here belongs to the same group as the refrigerant leakage sensor 5 that detects the leakage of the refrigerant.
  • step S1 the information processing unit 31 receives a signal indicating the leakage of the refrigerant from the refrigerant leakage sensor 5.
  • step S2 the information processing unit 31 transmits a command signal to the shutoff valve 30 in the same group as the refrigerant leak sensor 5.
  • the shutoff valve 30 that has received the command signal in step S3 closes the valve in response to the command signal.
  • step S4 the information processing unit 31 transmits a command signal to the indoor unit 2 in the same group as the refrigerant leakage sensor 5.
  • the indoor control unit 24 that has received the command signal in step S5 controls the notification unit 23 so as to issue an alarm. In response to this, the notification unit 23 issues an alarm.
  • the indoor control unit 24 controls the indoor blower 21 so as to blow air for diffusing the leaked refrigerant. In response to this, the indoor blower 21 blows air to diffuse the leaked refrigerant. Further, the indoor control unit 24 controls the indoor flow rate adjusting valve 22 so as to close the valve. In response to this, the indoor flow rate adjusting valve 22 closes the valve.
  • step S6 the information processing unit 31 transmits a command signal to the outdoor unit 1.
  • the outdoor unit 1 controls the compressor 10 to stop the operation and controls the outdoor flow rate adjusting valve 14 so as to close the valve.
  • the processes in steps S2, S4, and S6 may be performed in parallel or may be executed in any order.
  • the processes in steps S3, S5, and S7 may be performed in parallel or in any order as soon as the command signal is received.
  • FIG. 4 is a schematic diagram showing an example of a conventional air conditioning system.
  • the conventional air conditioning system 101 has an outdoor unit 1 and a plurality of indoor units 6, but does not have a shutoff valve unit 3.
  • a shutoff valve 30 is provided inside or outside each indoor unit 6 in place of the shutoff valve unit 3.
  • the refrigerant leakage sensor 5 is provided inside or outside each indoor unit 6.
  • the indoor unit 6 includes the indoor heat exchanger 20, the indoor blower 21, the indoor flow rate adjusting valve 22, and the notification unit 23, similarly to the indoor unit 2.
  • the indoor unit 6 includes an indoor control unit 60 corresponding to a combination of the information processing unit 31 and the indoor control unit 24. That is, the indoor control unit 60 in the conventional indoor unit 6 also has the function of the information processing unit 31.
  • the refrigerant leakage sensor 5 in the indoor unit 6 detects the leakage of the refrigerant
  • the refrigerant leakage sensor 5 transmits a signal indicating the leakage of the refrigerant to the indoor control unit 60 in the indoor unit 6.
  • the indoor control unit 60 in the indoor unit 6 in which the leakage of the refrigerant is detected controls the notification unit 23 to issue an alarm, and controls to close the shutoff valve 30 and the indoor flow rate adjusting valve 22 in the indoor unit 6. Further, the indoor control unit 60 of the indoor unit 6 transmits a command signal to the outdoor unit 1 when a refrigerant leaks.
  • the indoor control unit 60 in the indoor unit 6 performs the same processing as the indoor control unit 24. Therefore, the indoor control unit 60 in the indoor unit 6 in which the leakage of the refrigerant is not detected transmits a control signal in the case where the leakage of the refrigerant is not detected to the outdoor unit 1.
  • the outdoor unit 1 performs processing using command signals or control signals from each of the plurality of indoor units 6. However, as the number of indoor units 6 in the air conditioning system 101 increases, the amount of signal data to be processed by the outdoor unit 1 increases. In addition, the amount of communication due to the transmission and reception of signals between the outdoor unit 1 and each indoor unit 6 increases.
  • the outdoor unit 1 receives a command signal from some of the indoor units 6 that have detected the leakage of the refrigerant, if the outdoor unit 1 receives a control signal for prompting the outflow of the refrigerant from the other indoor unit 6, the outdoor unit 1 receives the command signal. In some cases, the refrigerant may flow out to the indoor unit 6 side. However, when a plurality of indoor units 6 are installed in the same room, the following problems may occur.
  • the refrigerant leakage sensor 5 in the indoor unit 6 in which the refrigerant is leaking does not detect the leakage of the refrigerant, and the refrigerant leakage sensor 5 in the other indoor unit 6 detects the leakage of the refrigerant.
  • the indoor unit 6 that has not detected the leakage of the refrigerant may transmit a control signal for prompting the outflow of the refrigerant to the outdoor unit 1 without closing the shutoff valve 30. Then, the processing by the outdoor unit 1 in response to the control signal may cause the refrigerant to flow into the indoor unit 6 and cause further leakage of the refrigerant.
  • the notification unit 23 in the indoor unit 6 provided with the refrigerant leakage sensor 5 that detects the leakage of the refrigerant issues an alarm about the leakage of the refrigerant.
  • the leakage of the refrigerant may occur in another indoor unit 6, and if the refrigerant leakage sensor 5 in the other indoor unit 6 does not detect the leakage of the refrigerant, the other In some cases, it was not possible to sufficiently warn the user of the indoor unit 6 of the above.
  • the indoor blower 21 of the indoor unit 6 provided with the refrigerant leak sensor 5 that does not detect the leakage of the refrigerant does not perform the air blowing process for reducing the concentration of the leaked refrigerant. Therefore, if the refrigerant leakage sensor 5 of the indoor unit 6 in which the refrigerant is leaking does not detect the leakage of the refrigerant, the refrigerant may stay and the concentration of the refrigerant may increase.
  • the conventional air conditioning system 101 also has the following problems.
  • the air conditioning system 100 the air conditioning system 101, etc.
  • the characteristics of the refrigerant leakage sensor 5 are changed, or when it is necessary to replace the refrigerant leakage sensor 5 due to aged deterioration, etc.
  • All refrigerant leakage sensors 5 need to be modified.
  • the refrigerant leakage sensor 5 is provided in each indoor unit 6. Therefore, as the number of indoor units 2 in the air conditioning system 101 increases, the work load for changing the refrigerant leakage sensor 5 also increases.
  • the characteristic of the refrigerant leakage sensor 5 is, for example, a threshold value of the concentration of the refrigerant used by the refrigerant leakage sensor 5 when determining the presence or absence of refrigerant leakage.
  • the threshold value is determined by the type of refrigerant and the like.
  • the air conditioning system 100 has the following merits.
  • the shutoff valve 30 for shutting off the inflow of the refrigerant into one or more indoor units 2 in the room is grouped in the shutoff valve unit 3.
  • the information processing unit 31 in the shutoff valve unit 3 receives a signal indicating the leakage of the refrigerant from the refrigerant leakage sensor 5.
  • the information processing unit 31 sends a command signal for instructing execution of a predetermined process when the refrigerant leaks to the outdoor unit 1, the one or more indoor units 2, the shutoff valve 30, and the like.
  • the one or more indoor units 2 that have received the command signal do not transmit the control signal to the outdoor unit 1.
  • the amount of communication in the air conditioning system 100 can be reduced.
  • the outdoor unit 1 receives at least one command signal, it executes the process according to the command signal, so that the amount of data processing is reduced as compared with the case where the process using the control signal is also executed. Can be made to.
  • the outdoor unit 1 stops operating in response to the command signal, the inflow of the refrigerant to the indoor unit 2 side is suppressed.
  • All shutoff valves 30 that have received the command signal close according to the command signal.
  • the information processing unit 31 transmits a command signal to the outdoor flow rate adjusting valve 14 to close the outdoor flow rate adjusting valve 14, and sends a command signal to close the outdoor flow rate adjusting valve 14. 14 closes according to the command signal. Therefore, the inflow of the refrigerant into all the indoor units 2 in the room is suppressed. As a result, the situation in which the refrigerant flows into the indoor unit 2 in which the refrigerant is leaking is suppressed, and further leakage of the refrigerant is suppressed.
  • all the indoor units 2 in the same room issue an alarm indicating that the refrigerant is leaking according to the command signal. Therefore, sufficient notification can be given to the users in the same room. Further, since each indoor blower 21 of all the indoor units 2 in the same room performs a blower operation for diffusing the refrigerant, the refrigerant is more diffused as compared with the conventional case, and the increase in the concentration of the refrigerant is further suppressed.
  • the refrigerant leakage sensor 5 is provided not for each indoor unit 2 but for a group of indoor units 2 in the same room.
  • One or a plurality of refrigerant leakage sensors 5 may be provided for the group of indoor units 2.
  • One or more refrigerant leakage sensors 5 for a group of indoor units 2 in the same room may be housed in the shutoff valve unit 3.
  • the air conditioning system 100 includes an outdoor unit 1, a plurality of indoor units 2, and one or more refrigerant leakage sensors 5.
  • the outdoor unit 1 exchanges heat between the outdoor air and the refrigerant in the refrigerant circuit 4 that circulates the refrigerant.
  • each of the plurality of indoor units 2 exchanges heat between the refrigerant and the air in the room to air-condition the room.
  • Each of the one or more refrigerant leakage sensors 5 detects the leakage of the refrigerant from the refrigerant circuit 4.
  • each refrigerant leakage sensor 5 is arranged separately from the outdoor unit 1 and the plurality of indoor units 2. This eliminates the need for work on the outdoor unit 1 and the plurality of indoor units 2 when changing the refrigerant leakage sensor 5. Therefore, the burden of changing the refrigerant leakage sensor 5 is reduced.
  • the number of refrigerant leakage sensors 5 in the room is less than or equal to the number of indoor units 2 in the room. As a result, the burden of changing the refrigerant leakage sensor 5 is further reduced.
  • the air conditioning system 100 further includes a plurality of shutoff valves 30 that shut off the inflow of the refrigerant into the plurality of indoor units 2 when the refrigerant leaks.
  • the plurality of shutoff valves 30 are arranged separately from the outdoor unit 1 and the indoor unit 2. As a result, when working on the shutoff valve 30, each work on the outdoor unit 1 and the indoor unit 2 becomes unnecessary, so that the work load on the shutoff valve 30 is reduced.
  • the air conditioning system 100 further includes one or more shutoff valve units 3.
  • the one or more shutoff valve units 3 include a plurality of shutoff valves 30 in a housing. As a result, the burden on the shutoff valve 30 when working is further reduced.
  • the shutoff valve unit 3 in the embodiment includes one or more refrigerant leakage sensors 5. As a result, the burden of changing the refrigerant leakage sensor 5 is further reduced.
  • the shutoff valve unit 3 in the embodiment further includes an information processing unit that controls a plurality of shutoff valves 30 included in the shutoff valve unit 3.
  • the refrigerant leakage sensor 5 detects the leakage of the refrigerant in the room
  • the refrigerant leakage sensor 5 transmits a signal indicating the leakage of the refrigerant to the information processing unit 31.
  • the information processing unit 31 collectively controls a plurality of shutoff valves 30 that shut off the inflow of the refrigerant into one or more indoor units 2 installed in each room.
  • the information processing unit 31 includes a shutoff valve 30 that shuts off the inflow of the refrigerant into one or more indoor units 2 in the room when the signal indicating the leakage of the refrigerant in the room is received from the refrigerant leak sensor 5.
  • a command signal for executing a predetermined operation when the refrigerant leaks is transmitted to the plurality of shutoff valves 30 included in the above.
  • the shutoff valve 30 closes the valve in order to shut off the flow of the refrigerant in accordance with the command signal.
  • shutoff valves 30 that shut off the inflow of the refrigerant into one or more indoor units 2 installed in each room are included in one shutoff valve unit 3 as one group. As a result, the work load on the shutoff valve 30 that shuts off the inflow of the refrigerant into one or more indoor units 2 in each room is reduced.
  • one or more refrigerant leakage sensors 5 installed in each room are grouped into one group and included in one shutoff valve unit 3. As a result, the work load on the refrigerant leakage sensor 5 that detects the leakage of the refrigerant in each room is reduced.
  • the shutoff valve unit 3 in the embodiment further includes an information processing unit 31.
  • the information processing unit 31 further includes an information processing unit 31 that controls a plurality of shutoff valves 30 included in the shutoff valve unit 3.
  • the refrigerant leakage sensor 5 detects the leakage of the refrigerant in the room
  • the refrigerant leakage sensor 5 transmits a signal indicating the leakage of the refrigerant to the information processing unit 31.
  • the information processing unit 31 receives a signal indicating a refrigerant leak
  • the information processing unit 31 causes a plurality of shutoff valves 30 included in the shutoff valve unit 3 to execute a predetermined operation when the refrigerant leaks. Send a command signal.
  • the shutoff valve 30 When the shutoff valve 30 receives the command signal, the shutoff valve 30 closes the valve in order to shut off the flow of the refrigerant in accordance with the command signal.
  • the air conditioning system 100 can simultaneously block the inflow of the refrigerant into one or more indoor units 2 in the room where the refrigerant is leaking, thereby ensuring the leakage of the refrigerant. Can be suppressed.
  • the information processing unit 31 in the embodiment receives the signal indicating the leakage of the refrigerant, the information processing unit 31 transmits a command signal to the outdoor unit 1 to execute a predetermined operation when the refrigerant leaks.
  • the outdoor unit 1 receives the command signal, the outdoor unit 1 stops its operation in accordance with the command signal.
  • the outdoor unit 1 stops its operation by a command signal from the information processing unit 31, so that the inflow of the refrigerant to the indoor unit 2 side can be suppressed, and further refrigerant can be used. Leakage can be suppressed.
  • the indoor unit 2 in the embodiment transmits a control signal for controlling the outdoor unit 1 to the outdoor unit 1.
  • the indoor unit 2 can reflect the user's desired air-conditioning operation on the outdoor unit 1.
  • the outdoor unit 1 in the embodiment receives the command signal
  • the operation is stopped according to the command signal even when the control signal is received.
  • the outdoor unit 1 receives a control signal prompting the outflow of the refrigerant from the other indoor unit 2
  • the operation is stopped according to the command signal, so that the outdoor unit 1 is directed to the indoor unit 2 where the refrigerant is leaking.
  • the inflow of refrigerant is suppressed. This makes it possible to suppress further leakage of the refrigerant.
  • the outdoor unit 1 stops the operation only in response to the command signal instead of the processing using the command signal and the control signal, the load of data processing by the outdoor unit 1 can be reduced.
  • the information processing unit 31 in the embodiment receives a signal indicating the leakage of the refrigerant from the refrigerant leakage sensor 5 that has detected the leakage of the refrigerant in the room, the information processing unit 31 transmits a command signal to one or more indoor units 2 in the room. do.
  • the indoor unit 2 receives the command signal, the indoor unit 2 does not transmit the control signal for controlling the outdoor unit 1 to the outdoor unit 1 in accordance with the command signal.
  • the amount of communication in the air conditioning system 100 can be reduced.
  • the outdoor unit 1 since the outdoor unit 1 does not need to perform the processing of receiving the control signal and the processing using the control signal, the amount of processing by the outdoor unit 1 can be reduced.
  • the information processing unit 31 in the embodiment receives a signal indicating the leakage of the refrigerant from the refrigerant leakage sensor 5 that has detected the leakage of the refrigerant in the room, the refrigerant is transmitted to one or more indoor units 2 in the room.
  • a command signal for executing a predetermined operation in the case of leakage is transmitted.
  • the indoor unit 2 includes an indoor blower 21 that blows air into the room and an indoor control unit 24 that controls the indoor blower 21.
  • the indoor control unit 24 controls the indoor blower 21 so as to perform an air blowing process for diffusing the leaked refrigerant in accordance with the command signal.
  • the information processing unit 31 When a refrigerant leak is detected in the room, the information processing unit 31 collectively transmits a command signal to one or more indoor units 2 in the room, and in response to the command signal, the indoor blower of each indoor unit 2. Since 21 performs the ventilation treatment, the diffusion of the refrigerant in the room is further promoted. As a result, an increase in the concentration of the refrigerant in the room can be suppressed.
  • the indoor unit 2 includes a notification unit 23 that notifies the leakage of the refrigerant, and an indoor control unit 24 that controls the notification unit 23.
  • the indoor control unit 24 controls the notification unit 23 so as to notify the leakage of the refrigerant according to the command signal.
  • the information processing unit 31 When a refrigerant leak is detected in a room, the information processing unit 31 collectively transmits a command signal to one or more indoor units 2 in the room, and each indoor unit 2 issues an alarm in response to the command signal. Therefore, the notification of the leakage of the refrigerant to the user in the room is sufficiently provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)
PCT/JP2020/014568 2020-03-30 2020-03-30 空気調和システム Ceased WO2021199163A1 (ja)

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DE112020007002.6T DE112020007002T5 (de) 2020-03-30 2020-03-30 Klimaanlage
JP2022512904A JP7330363B2 (ja) 2020-03-30 2020-03-30 空気調和システム
PCT/JP2020/014568 WO2021199163A1 (ja) 2020-03-30 2020-03-30 空気調和システム
US17/796,004 US12235029B2 (en) 2020-03-30 2020-03-30 Air-conditioning system with separate refrigerant leak sensors
GB2211658.6A GB2607499B (en) 2020-03-30 2020-03-30 Air-conditioning system
CN202080098994.9A CN115349073B (zh) 2020-03-30 2020-03-30 空调系统

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GB2607499B (en) 2024-02-07
JPWO2021199163A1 (https=) 2021-10-07
JP7330363B2 (ja) 2023-08-21
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CN115349073A (zh) 2022-11-15
DE112020007002T5 (de) 2023-01-26

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