WO2017002215A1 - Système de détection de fuite de fluide frigorigène - Google Patents

Système de détection de fuite de fluide frigorigène Download PDF

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Publication number
WO2017002215A1
WO2017002215A1 PCT/JP2015/068901 JP2015068901W WO2017002215A1 WO 2017002215 A1 WO2017002215 A1 WO 2017002215A1 JP 2015068901 W JP2015068901 W JP 2015068901W WO 2017002215 A1 WO2017002215 A1 WO 2017002215A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
sensor
inspection
devices
refrigerant leakage
Prior art date
Application number
PCT/JP2015/068901
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English (en)
Japanese (ja)
Inventor
基志 那須
井上　琢也
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to GB1717831.0A priority Critical patent/GB2554267B/en
Priority to PCT/JP2015/068901 priority patent/WO2017002215A1/fr
Priority to JP2017525732A priority patent/JPWO2017002215A1/ja
Publication of WO2017002215A1 publication Critical patent/WO2017002215A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52—Indication arrangements, e.g. displays
    • F24F11/526—Indication arrangements, e.g. displays giving audible indications
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52—Indication arrangements, e.g. displays
    • 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
    • F24F11/89—Arrangement or mounting of control or 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
    • F25B2500/00—Problems to be solved
    • F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
    • 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 invention relates to a refrigerant leakage detection system that detects refrigerant leakage in a cooling system.
  • a refrigerant leakage detection device is provided in a cooling device such as an air conditioner or a refrigerator in order to detect refrigerant leakage from the cooling device.
  • a refrigerant leakage detection device is provided in a cooling device such as an air conditioner or a refrigerator in order to detect refrigerant leakage from the cooling device.
  • a refrigerant leakage detection device is provided in a cooling device such as an air conditioner or a refrigerator in order to detect refrigerant leakage from the cooling device.
  • Patent Document 1 the presence or absence of a refrigerant leak is determined from the refrigerant concentration detected by a sensor. When it is determined that the refrigerant is leaking, an alarm sound is emitted from an alarm buzzer and a shut-off valve is closed. It describes that the refrigerant flow is cut off and the ventilation fan is turned to lower the refrigerant concentration in the room.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a refrigerant leakage detection system that can easily grasp the location of occurrence of refrigerant leakage.
  • a refrigerant leakage detection system includes a plurality of refrigerant sensors arranged at different locations, a plurality of refrigerant leakage detection devices that determine the presence or absence of refrigerant leakage based on outputs of the plurality of refrigerant sensors, and a plurality of refrigerants
  • the leak detection device a plurality of alarms that emit an alarm sound when it is determined that a refrigerant leak has occurred, and a plurality of safety devices that operate when it is determined that a refrigerant leak has occurred in the plurality of refrigerant leak detection devices
  • the address is set to each of the plurality of refrigerant sensors, the plurality of refrigerant leakage detection devices, the plurality of alarm devices, and the plurality of safety devices.
  • the refrigerant leakage detection system by setting addresses in the plurality of refrigerant sensors, the plurality of refrigerant leakage detection devices, the plurality of alarm devices, and the plurality of safety devices, the locations where refrigerant leakage occurs, etc. Can be easily identified from the address.
  • FIG. 1 is a schematic configuration diagram of an air conditioning system according to Embodiment 1.
  • FIG. It is a figure which shows the apparatus connected to the internal structure of the refrigerant
  • 3 is a flowchart showing a flow of a refrigerant leakage detection process in the first embodiment. 3 is an example of a layout diagram displayed on the centralized controller according to the first embodiment.
  • FIG. 6 is a schematic configuration diagram of an air-conditioning system according to Embodiment 2.
  • FIG. 6 is a schematic configuration diagram of an air-conditioning system according to Embodiment 2.
  • FIG. 10 is a flowchart showing a flow of processing in an inspection mode according to the third embodiment. It is the schematic diagram which looked at the state by which the refrigerant
  • coolant leak detection apparatus. 10 is a graph showing transition of output values of two refrigerant sensors in the fourth embodiment.
  • FIG. 1 is a schematic configuration diagram of an air-conditioning system 10 according to Embodiment 1 of the present invention.
  • the air conditioning system 10 of the present embodiment performs cooling and heating in the building 100 by performing a vapor compression refrigeration cycle operation.
  • the air conditioning system 10 includes an outdoor unit 1 installed outside the building 100, a shunt controller 2 installed inside the building 100, and a plurality of indoor units 31, 32, and 33.
  • a solid line connecting the components indicates a refrigerant pipe, and a broken line indicates a communication line.
  • the outdoor unit 1 supplies cold or warm heat into the building 100 and is installed outside the building 100.
  • the outdoor unit 1 constitutes a part of a refrigerant circuit, and includes a compressor 11, an outdoor heat exchanger (not shown), a four-way valve (not shown), an expansion valve (not shown), and outdoor heat.
  • a fan 12 for supplying air to the exchanger and a control device 13 are provided.
  • the operation capacity of the compressor 11 and the rotational speed of the fan 12 are controlled by the control device 13.
  • the control device 13 is communicably connected to a control device (not shown) and a centralized controller 40 provided in the shunt controller 2 and the indoor units 31 to 33, respectively.
  • the shunt controller 2 is arranged between the outdoor unit 1 and the indoor units 31 to 33, and controls the flow of the refrigerant to the indoor units 31 to 33.
  • the shunt controller 2 is disposed, for example, in the back of the ceiling of the monitoring room 101 of the building 100.
  • the indoor units 31 to 33 constitute a refrigerant circuit together with the outdoor unit 1, and each include an indoor heat exchanger (not shown) and a fan (not shown) for supplying air to the indoor heat exchanger.
  • the indoor unit 31 is embedded in the ceiling of the living room 102 and cools and heats the living room 102.
  • the indoor unit 32 is installed by being embedded in the ceiling of the living room 103, and performs cooling and heating of the living room 103.
  • the indoor unit 33 is installed on the floor of the living room 103 and performs cooling and heating of the living room 103 together with the indoor unit 32.
  • the indoor units 31, 32, and 33 are provided with remote controllers 41, 42, and 43, respectively.
  • the remote controllers 41 to 43 By operating the remote controllers 41 to 43, the operation / stop of the indoor units 31 to 33, the operation mode, the set temperature, and the like can be controlled.
  • a centralized controller 40 that manages the entire air conditioning system 10 is disposed.
  • the centralized controller 40 communicates with the shunt controller 2 and the control devices (not shown) of the indoor units 31 to 33 via the outdoor unit 1, and information such as the operating state of the shunt controller 2 and the indoor units 31 to 33. To get.
  • a plurality of refrigerant sensors 51, 52, 53, and 54 for detecting refrigerant are arranged in a building 100.
  • the plurality of refrigerant sensors 51 to 54 are, for example, semiconductor type gas detection sensors, and detect the same or equivalent gas as the refrigerant used in the refrigerant circuit of the air conditioning system 10.
  • the refrigerant sensor 51 is incorporated in the flow dividing controller 2 and is disposed in or around the product, such as a pipe joint.
  • the refrigerant sensor 52 is installed on the floor of the living room 102 or a wall near the floor.
  • the refrigerant sensor 53 is incorporated in the indoor unit 32 of the living room 103 and is disposed, for example, in the vicinity of the indoor heat exchanger.
  • the refrigerant sensor 54 is installed on the floor of the living room 103 or a wall near the floor.
  • the refrigerant sensors 51 to 54 may be installed so as to be removable. As a result, it can be exchanged in the event of a failure or when the reaction has deteriorated due to prolonged use.
  • the detection signals of the refrigerant sensors 51, 52, 53 and 54 are output to the refrigerant leakage detection devices 61, 62, 63 and 64, respectively.
  • the refrigerant leakage detection devices 61 to 64 determine the presence or absence of refrigerant leakage based on the detection signals of the refrigerant sensors 51 to 54, and activate the safety device when it is determined that refrigerant leakage has occurred.
  • the refrigerant leak detection device 61 is disposed in the monitoring chamber 101 and determines whether or not there is a refrigerant leak from the branch controller 2 based on the detection signal of the refrigerant sensor 51.
  • the refrigerant leak detection device 62 is arranged in the living room 102 and determines whether or not there is a refrigerant leak from the indoor unit 31 based on the detection signal of the refrigerant sensor 52.
  • the refrigerant leak detection device 63 is disposed in the living room 103 and determines whether or not there is a refrigerant leak from the indoor unit 32 based on the detection signal of the refrigerant sensor 53.
  • the refrigerant leak detection device 64 is arranged in the living room 103 and determines whether or not there is a refrigerant leak from the indoor unit 33 based on the detection signal of the refrigerant sensor 54.
  • the refrigerant leakage detection devices 61 to 64 may be provided independently of the branch controller 2 and the indoor units 31 to 33, or may be incorporated in the branch controller 2 or the indoor units 31 to 33.
  • alarm devices 71, 72, and 73 are installed in the monitoring room 101 and the living rooms 102 and 103, respectively, for notifying the user of refrigerant leakage.
  • the alarm device 71 is installed in the monitoring room 101 and emits an alarm sound when refrigerant leakage is detected by the refrigerant leakage detection device 61.
  • the alarm device 72 is installed in the living room 102 and emits an alarm sound when refrigerant leakage is detected by the refrigerant leakage detection device 62.
  • the alarm device 73 is installed in the living room 103 and emits an alarm sound when refrigerant leakage is detected by the refrigerant leakage detection device 63 or 64.
  • the alarm device 73 may be set to emit a different alarm sound for each refrigerant sensor in which refrigerant leakage is detected. Specifically, the alarm device 73 may vary the level of the alarm sound between when the refrigerant leak is detected by the refrigerant sensor 53 and when the refrigerant leak is detected by the refrigerant sensor 54. Thereby, even when a plurality of refrigerant sensors are arranged in the living room 103, the occurrence location of the refrigerant leakage can be estimated by the pitch of the alarm 73. Further, the alarm devices 71 to 73 may be incorporated in the refrigerant leak detection devices 61 to 64, respectively.
  • shut-off valves 81, 82, and 83 are arranged as safety devices in the refrigerant piping that connects the diversion controller 2 and the indoor units 31, 32, and 33, respectively.
  • the shut-off valve 81 is disposed between the branch controller 2 and the indoor unit 31 and is closed when refrigerant leakage is detected by the refrigerant leakage detection device 62.
  • the shut-off valve 82 is disposed between the branch controller 2 and the indoor unit 32, and is closed when refrigerant leakage is detected by the refrigerant leakage detection device 63.
  • the shut-off valve 83 is disposed between the flow dividing controller 2 and the indoor unit 33, and is closed when refrigerant leakage is detected by the refrigerant leakage detection device 64.
  • ventilation devices 90, 91 and 92 are installed in the monitoring room 101 and the living rooms 102 and 103 as safety devices, respectively.
  • the ventilation devices 90 to 92 are, for example, propeller fans driven by a fan motor (not shown).
  • the ventilation device 90 is installed on the wall surface between the monitoring room 101 and the living room 102 and is activated when refrigerant leakage is detected by the refrigerant leakage detection device 61 to ventilate the refrigerant in the monitoring room 101.
  • the ventilator 90 may be disposed on the wall facing the outside of the monitoring room 101 and discharge the refrigerant in the monitoring room 101 to the outside.
  • the ventilation device 91 is installed on the wall surface of the living room 102 and is activated when refrigerant leakage is detected by the refrigerant leakage detection device 62, and discharges the refrigerant in the living room 102 to the outdoors.
  • the ventilation device 92 is installed on the wall surface of the living room 103 and is activated when refrigerant leakage is detected by the refrigerant leakage detection device 63 or 64, and discharges the refrigerant in the living room 103 to the outdoors.
  • FIG. 2 is a diagram showing an internal configuration of the refrigerant leak detection device 62 and devices connected to the refrigerant leak detection device 62.
  • the internal configuration of the refrigerant leak detection devices 61, 63 and 64 is substantially the same as that of the refrigerant leak detection device 62, and here, the refrigerant leak detection device 62 will be described as a representative.
  • the refrigerant leakage detection device 62 includes a detection circuit 621 that detects an output from the refrigerant sensor 52, a control unit 622 that controls the entire refrigerant leakage detection device 62, and a drive circuit 623 that drives a safety device. And a power supply circuit 624 that supplies power to each unit, a storage unit 625, a communication unit 626 that communicates with the indoor unit 31, and signal output units 627, 628, and 629 connected to the safety device.
  • the detection circuit 621 detects the detection signal of the refrigerant sensor 52, performs A / D conversion, and outputs it to the control means 622 as an output value such as a DC voltage value.
  • the control means 622 controls each part of the refrigerant leakage detection device 62, and is constituted by a microcomputer, for example. In another embodiment, the detection circuit 621 may be included in the control unit 622.
  • the drive circuit 623 drives the signal output means 627, 628 and 629 in response to the control signal from the control means 622.
  • An alarm device 72 is connected to the signal output means 627, a cutoff valve 81 is connected to the signal output means 628, and a ventilator 91 is connected to the signal output means 629.
  • the power supply circuit 624 converts, for example, an AC power supply AC, which is a commercial power supply, into a DC power supply such as DCI2V and DC5V, and supplies it to the drive circuit 623 and the control means 622.
  • the refrigerant leakage detection device 62 is supplied with power independently of the indoor unit 31 and always operates.
  • the power supply circuit for the indoor unit 31 is used. May be configured to operate in conjunction with the indoor unit 31.
  • the storage means 625 is constituted by, for example, a semiconductor memory and stores various data and programs used for controlling the refrigerant leakage detection device 62.
  • the communication unit 626 transmits and receives data to and from the control device (not shown) of the indoor unit 31 by wired or wireless communication.
  • the communication unit 626 can communicate with the remote controller 41 and the centralized controller 40 via the indoor unit 31.
  • the communication unit 626 may be configured to directly communicate with the centralized controller 40 or the remote controller 41.
  • FIG. 3 is a flowchart showing the flow of the refrigerant leak detection process performed by the refrigerant leak detection device 62.
  • the detection signal of the refrigerant sensor 52 is acquired by the detection circuit 621, converted into an output value, and output to the control means 622 (S1).
  • the control means 622 compares the output value with a set value that serves as a criterion for refrigerant leakage (S2).
  • the set value is a value defined in an industry standard or the like, and is stored in the storage unit 625.
  • the setting value may be variably adjusted according to the installation situation at the site.
  • a mechanism that cannot be adjusted by a general user prevents easy relaxation of refrigerant leakage detection. If the output value is less than the set value (S2: NO), it is determined that no refrigerant leakage has occurred, and the process returns to step S1.
  • the output value is greater than or equal to the set value (S2: YES)
  • the signal output means 627 is driven by the drive circuit 623 that has received the leakage signal, and the alarm device 72 is activated (S3).
  • the signal output means 628 and 629 are driven by the drive circuit 623, and the safety device is activated (S4). Specifically, the shutoff valve 81 connected to the signal output means 628 is closed, and the ventilator 91 connected to the signal output means 629 is driven.
  • shutoff valve since the shutoff valve is not connected to the refrigerant leak detection device 61, a signal instructing the outdoor unit 1 to stop the compressor 11 is transmitted instead of operating the shutoff valve. Thereby, the flow of the refrigerant to the diversion controller 2 can be stopped.
  • control means 622 transmits a signal notifying that a refrigerant leak has occurred to the indoor unit 31 via the communication means 626 (S5).
  • the notification signal is transmitted from the indoor unit 31 to the centralized controller 40 via the outdoor unit 1. Further, the date and time when the refrigerant leakage occurred and the output value of the refrigerant sensor 52 at that time are stored in the storage means 625 by the control means 622 (S6).
  • the central controller 40 grasps the occurrence of the refrigerant leak by transmitting a signal notifying that the refrigerant leak has been detected by the refrigerant leak detection device 62 to the central controller 40 via the indoor unit 31. Can do.
  • the centralized controller 40 together with the operating states of the indoor units 31 to 33, the refrigerant sensors 51 to 54, the refrigerant leak detection devices 61 to 64, the alarm devices 71 to 73, the shut-off valves 81 to 83, and the ventilation devices 90 to 92 are displayed.
  • the state can be grasped, and these can be displayed on the layout diagram.
  • FIG. 4 is an example of a layout diagram displayed on the centralized controller 40.
  • the centralized controller 40 includes display means 410 configured with a liquid crystal display or the like.
  • the display means 410 includes a layout of the building 100, refrigerant leak detection devices 61 to 64, refrigerant sensors 51 to 54, alarm devices 71 to 73, shutoff valves 81 to 83, and ventilation devices 90 to 90 arranged in each room.
  • An icon indicating 92 is displayed.
  • the centralized controller 40 receives the signal notifying that the refrigerant leak has been detected, the centralized controller 40 identifies the refrigerant sensor in which the refrigerant leak has been detected, and the alarm device, the shut-off valve, and the ventilator that are activated by the refrigerant leak.
  • the display means 410 includes at least one of refrigerant leakage detection devices 61 to 64, refrigerant sensors 51 to 54, alarm devices 71 to 73, shutoff valves 81 to 83, and ventilation devices 90 to 92 disposed in each room. One should be displayed.
  • the location or scale of occurrence of refrigerant leakage can be quickly determined. I can grasp it. Thereby, appropriate evacuation guidance etc. can be performed and safety can be improved.
  • one refrigerant sensor is connected to one refrigerant leak detection device.
  • one refrigerant leak detection device includes a plurality of refrigerant leak detection devices.
  • the refrigerant sensor may be connected.
  • FIG. 5 is a diagram illustrating devices arranged in the living room 102 according to the modification of the first embodiment.
  • a refrigerant sensor 55 incorporated in the indoor unit 31 is provided in addition to the refrigerant sensor 52 arranged near the floor of the living room 102.
  • the refrigerant leak detection device 62 receives the detection signals of the refrigerant sensor 52 and the refrigerant sensor 55, respectively, compares the detection signals with the set values, and determines that the refrigerant leak has occurred when either of them exceeds the set value. .
  • refrigerant sensors are arranged on the ceiling and the floor as in the example of FIG. 5, it is possible to estimate the refrigerant leakage speed and amount by calculating the time difference at which each refrigerant sensor operates. .
  • the time difference during which the refrigerant sensors 52 and 55 are operated is small, the refrigerant leakage speed is fast and there is a possibility that a large amount of leakage occurs. Therefore, in this case, it is determined that immediate evacuation is necessary, and an alarm is issued from the alarm device 72 so as to perform immediate evacuation.
  • the refrigerant leakage speed is slow and a small amount of leakage occurs. There is a possibility. Therefore, in this case, it may be determined that immediate evacuation is not necessary, and instead of issuing an alarm sound from the alarm device 72, a display indicating that maintenance is to be performed, an instruction by voice, or the like may be performed. Further, the sound and volume of the alarm device 72 may be changed according to the leakage speed and leakage amount of the refrigerant.
  • FIG. 6 is a schematic configuration diagram of an air conditioning system 10A in the present embodiment.
  • the heat source machine 1 ⁇ / b> A is arranged in a machine room 104 in the building 100.
  • the heat source machine 1A supplies cold or warm heat into the building 100, and includes a compressor 11, a water heat exchanger 14, a four-way valve (not shown), an expansion valve (not shown), and a control.
  • a device 13 In addition, a cooling tower 15 and a water pump 16 for supplying water to the water heat exchanger 14 are disposed outside the room.
  • the machine room 104 is provided with a refrigerant sensor 56, a refrigerant leak detection device 65, an alarm device 74, and a ventilation device 93 in order to detect refrigerant leakage from the heat source unit 1A.
  • the configuration of the refrigerant sensor 56, the refrigerant leak detection device 65, the alarm device 74, and the ventilation device 93 includes the refrigerant sensors 51 to 54, the refrigerant leak detection devices 61 to 64, the alarm devices 71 to 73, and the ventilation device 90 to the first embodiment. 92.
  • the refrigerant leakage detection device 65 the same refrigerant leakage detection process as that in FIG. 3 of the first embodiment is performed. However, the refrigerant leakage detection device 65 activates the ventilation device 93 and stops the operation of the compressor 11 in step S4 of FIG.
  • addresses are also set for the refrigerant sensor 56, the refrigerant leakage detection device 65, the alarm device 74, and the ventilation device 93, respectively, and the states of the refrigerant sensor 56, the refrigerant leakage detection device 65, the alarm device 74, and the ventilation device 93 are the centralized controller. It is displayed in 40 layout diagrams.
  • the central controller 40 can quickly grasp the occurrence of refrigerant leakage in the heat source device 1A.
  • Embodiment 3 a third embodiment of the present invention will be described.
  • the control unit of the refrigerant leak detection device executes a normal mode for detecting a refrigerant leak at normal times and an inspection mode for checking whether or not the refrigerant leak detection system is operating normally. This is different from the first embodiment.
  • the refrigerant leakage detection device 62A in the third embodiment and the refrigerant sensor 52, the alarm device 72, the shut-off valve 81, and the ventilation device 91 connected to the refrigerant leakage detection device 62A will be described as an example. To do.
  • FIG. 7 is a diagram showing an internal configuration of the refrigerant leakage detection device 62A and devices connected to the refrigerant leakage detection device 62A in the present embodiment.
  • the refrigerant leakage detection device 62A includes a detection circuit 621, a control unit 622, a drive circuit 623, a power supply circuit 624, a storage unit 625, and a communication unit 626 similar to those in the first embodiment.
  • a display means 631 and an operation means 632 are provided.
  • the display means 631 is composed of, for example, an LED.
  • the operation means 632 is constituted by, for example, a slide switch.
  • detection signals from the flow sensor 810 and the wind speed sensor 910 are input to the detection circuit 621 in addition to the detection signal from the refrigerant sensor 52.
  • the flow sensor 810 is attached to the downstream side of the cutoff valve 81 and detects the flow rate of the refrigerant on the downstream side of the cutoff valve 81.
  • the wind speed sensor 910 is attached to the ventilator 91 and detects the wind speed of the ventilator 91.
  • the control means 622 executes a normal mode for detecting refrigerant leakage at normal times and an inspection mode for checking whether or not the refrigerant leakage detection system is operating normally.
  • the refrigerant leakage detection procedure (FIG. 3) of the first embodiment is performed.
  • the control unit 622 includes a mode switching unit 21, an inspection instruction unit 22, a determination unit 23, a display control unit 24, and a time measuring unit 25 that are displayed in FIG.
  • Each of the above units is a functional unit realized by software, and is realized by executing a program by the control unit 622.
  • the mode switching unit 21 switches between the normal mode and the inspection mode in accordance with the operation of the operation means 632. Note that the mode switching unit 21 may switch between the normal mode and the inspection mode based on the operation signal from the centralized controller 40 or the remote controller 41 received via the communication unit 626. In addition, when the mode switching unit 21 is switched to the inspection mode, the mode switching unit 21 transmits a signal instructing the stop of the fan 310 of the indoor unit 31 to the indoor unit 31 via the communication unit 626.
  • the inspection instruction unit 22 When the inspection instruction unit 22 is switched to the inspection mode, the inspection instruction unit 22 transmits an inspection signal instructing the driving circuit 623 to perform the inspection.
  • the determination unit 23 determines whether or not each unit is operating normally based on the output value from the detection circuit 621.
  • the inspection result in the determination unit 23 is stored in the storage unit 625 together with the inspection date and time.
  • the display control unit 24 controls the display means 631 to perform a display for prompting inspection and a display indicating the inspection mode state.
  • the timer 25 measures the time after switching to the inspection mode.
  • the refrigerant leakage detection device 62A and the refrigerant sensor 52, the alarm device 72, the shut-off valve 81, and the ventilation device 91 connected to the refrigerant leakage detection device 62A are periodically inspected.
  • the alarm warning inspection of the alarm device 72 is performed at least once a month, and other devices are inspected at least once a year. Therefore, in the present embodiment, when the inspection deadline is approaching, the display control unit 24 displays the display unit 631 to prompt the inspection. It should be noted that the timing at which the display for prompting the inspection is variable, for example, two weeks before the legal inspection deadline, so that it is possible to remember to ask the inspector.
  • the display control unit 24 may instruct the remote controller 41 or the centralized controller 40 to perform a display for prompting inspection via the communication unit 626, or may transmit it by e-mail through the Internet line. If the e-mail destination is a maintenance inspection company, it is possible to place an order automatically.
  • FIG. 8 is a flowchart showing the flow of processing in the inspection mode. This process is started when the mode switching unit 21 switches to the inspection mode.
  • the centralized controller 40 or the remote controller 41 displays the inspection mode (S21). Specifically, “inspection” may be displayed on the remote controller 41 or the centralized controller 40, or an LED indicating the inspection mode may be turned on. Thereby, it can notify outside that it is in inspection mode.
  • the centralized controller 40 or the remote controller 41 is not connected, it may be displayed on a display unit of a device such as the indoor unit 31 or may be displayed on the display unit 631 of the refrigerant leakage detection device 62A. Further, in addition to the display, the inspection mode may be notified by voice or the like.
  • the fan 310 of the indoor unit 31 is stopped by an instruction from the mode switching unit 21 (S22).
  • the mode switching unit 21 S22.
  • the refrigerant diffuses and the concentration decreases, so that the refrigerant is difficult to detect. Therefore, the refrigerant is easily detected by stopping the fan 310 in the inspection mode.
  • the refrigerant leakage detection device 62A, the refrigerant sensor 52, the alarm device 72, the shut-off valve 81, and the ventilation device 91 are inspected (S23). These inspections may be performed individually for each device, or may be performed in conjunction with all devices. For example, when a large number of refrigerant sensors are connected to the refrigerant leakage detection device 62A, the alarm device 72, the shut-off valve 81, and the ventilation device 91 are separated and individually inspected to reduce the number of inspections. it can. Moreover, since it is not necessary to operate the shut-off valve 81 every time the refrigerant sensor is inspected, the operation of the indoor unit 31 can be continued.
  • the refrigerant leakage detection device 62A, the refrigerant sensor 52, the alarm device 72, the shut-off valve 81, and the ventilation device 91 are individually checked will be described.
  • the refrigerant sensor 52 In the inspection of the refrigerant sensor 52, the refrigerant is blown onto the refrigerant sensor 52, and when the determination unit 23 determines that the output value of the refrigerant sensor 52 is equal to or higher than the reference value, the refrigerant sensor 52 and the refrigerant leakage detection device 62A are normal. It is determined to operate. At this time, the output value of the refrigerant sensor 52 may be displayed on the display means 631, the remote controller 41, the centralized controller 40, or the like to determine whether or not the value is an appropriate value.
  • the refrigerant blown to the refrigerant sensor 52 is the same or equivalent refrigerant as the refrigerant used in the refrigerant circuit of the air conditioning system 10. However, in the inspection mode, the operation of the refrigerant sensor 52 may be confirmed using a refrigerant having a low concentration.
  • FIG. 9 is a schematic view of the state in which the refrigerant sensor 53 and the refrigerant leakage detection device 63 are accommodated in the indoor unit 32 as viewed from the side. In the example shown in FIG.
  • the casing 321 of the indoor unit 32 is the casing of the refrigerant leakage detection device 63 and the refrigerant sensor 53.
  • the indoor unit 32 is arranged with a casing 321 embedded in the ceiling.
  • An opening 322 is formed at a position of the housing 321 facing the refrigerant sensor 53.
  • the opening 322 may be a small hole into which a nozzle for blowing refrigerant gas is inserted.
  • the opening 322 is normally closed, and can be opened without a tool during inspection. Thereby, even when the refrigerant sensor 53 is incorporated in the indoor unit 32, the inspection can be performed without removing the exterior panel of the indoor unit 32, and the working efficiency is improved.
  • an inspection signal is transmitted from the inspection instruction unit 22 to the drive circuit 623, and whether or not the alarm device 72 and the refrigerant leakage detection device 62A are normally operated based on the alarm device 72 is notified.
  • the drive circuit 623 that has received the inspection signal drives the alarm device 72 by driving the signal output means 627.
  • the alarm device 72 emits an alarm sound, it is determined that the alarm device 72 is operating normally.
  • a microphone may be attached to the alarm device 72, connected to the refrigerant leakage detection device 62A, and the operation of the alarm device 72 may be confirmed by the determination unit 23 based on the output value of the microphone.
  • an operation switch may be provided in the alarm device 72 and it may be confirmed whether or not the alarm is issued by operating the operation switch. In this case, the inspection can be performed independently from the refrigerant leakage detection device 62A.
  • the drive circuit 623 may operate the alarm device 72 at a lower volume in the inspection mode than in the normal mode. As a result, it is possible to prevent reporting at a volume higher than necessary during the inspection.
  • shut-off valve 81 In the inspection of the shut-off valve 81, an inspection signal is transmitted from the check instructing unit 22 to the drive circuit 623, and whether or not the shut-off valve 81 and the refrigerant leakage detection device 62A operate normally is determined based on the output value of the flow sensor 810. Check. Specifically, the drive circuit 623 that has received the inspection signal drives the signal output means 628 to operate the shut-off valve 81. When the shutoff valve 81 is normally closed, the flow rate detected by the flow sensor 810 decreases. The determination unit 23 determines whether the cutoff valve 81 operates normally based on the output value of the flow sensor 810 by opening / closing the cutoff valve 81.
  • a pressure sensor may be attached to the downstream side of the shutoff valve 81 instead of the flow sensor 810, and the operation of the shutoff valve 81 may be checked based on a change in pressure. Further, a flow sensor or a pressure sensor may be attached before and after the shutoff valve 81, and the operation of the shutoff valve 81 may be confirmed based on a difference in flow rate or pressure before and after the shutoff valve 81.
  • an inspection signal is transmitted from the inspection instruction unit 22 to the drive circuit 623, and whether or not the ventilation device 91 and the refrigerant leakage detection device 62A operate normally based on the output value of the wind speed sensor 910.
  • the drive circuit 623 that has received the inspection signal drives the signal output means 629 to operate the ventilation device 91.
  • the ventilation device 91 operates normally, the wind speed detected by the wind speed sensor 910 increases.
  • the determination unit 23 determines whether the ventilator 91 operates normally based on the output value of the wind speed sensor 910.
  • an inspection signal may be transmitted from the inspection instruction unit 22 to the drive circuit 623, and it may be visually confirmed whether or not the ventilation device 91 rotates. Moreover, it replaces with the wind speed sensor 910, a flow sensor may be attached to the ventilator 91, and operation
  • each device is not limited to the above, and various changes are possible. Further, it is not necessary to inspect all of the refrigerant sensor 52, the alarm device 72, the shutoff valve 81, and the ventilation device 91, and the inspection object is selected from the refrigerant sensor 52, the alarm device 72, the shutoff valve 81, and the ventilation device 91. May be checked. In addition, when performing inspection with all the devices linked, the alarm device 72, the shut-off valve 81, and the ventilation device 91 are activated when the refrigerant is sprayed on the refrigerant sensor 52 and the output value reaches a predetermined concentration. You can confirm.
  • the inspection result in the determination unit 23 and the output value of each sensor may be displayed on the display means 631, the remote controller 41 or the centralized controller 40.
  • the inspection mode determines whether or not to end the inspection mode (S24).
  • the inspection mode has been switched to the normal mode based on the operation of the operation means 632, the centralized controller 40, or the remote controller 41.
  • the inspection mode is ended (S24: YES)
  • the inspection date or inspection date and time and the inspection result are stored in the storage means 625 (S26).
  • the inspection result stored here is the pass / fail of the operation check of the refrigerant sensor 52, the alarm device 72, the shutoff valve 81, and the ventilation device 91, or the refrigerant sensor 52, the flow sensor 810, the wind speed sensor 910, and the output value of the microphone. .
  • the concentration of the refrigerant gas used for the inspection in association with the actually measured value of the refrigerant sensor 52, it is possible to record the sensing accuracy.
  • the inspection date / time and the inspection result may be stored not only in the storage unit 625 but also in an external memory such as an SD card (registered trademark).
  • the inspection result and the inspection date / time may be transmitted to the remote controller 41, the centralized controller 40, or other external devices via the communication unit 626.
  • the inspection date and the inspection result may be output as a form.
  • the refrigerant leakage detection device 62A may be provided with a form output means, or the inspection date and result and the inspection result are transmitted to an external device having a form output function via the communication means 626, and the external device You may instruct to output the check date and the check result.
  • the inspection mode is not terminated (S24: NO)
  • the inspection time is a time required for performing the inspection, and is set in advance and stored in the storage unit 625. If the inspection time has elapsed (S25: YES), the process proceeds to step S26, and the inspection date and result and the inspection result are stored in the storage means 625 (S26). In this way, when the predetermined time has elapsed, the inspection mode is automatically terminated, so that it is possible to prevent forgetting to switch to the normal mode.
  • the return to the normal mode may be notified by display or sound. Furthermore, the user may be prompted to input an extension of the inspection time, and when there is an input of an extension of the inspection time, the inspection time may be extended and the inspection may be continued.
  • the fan 310 of the indoor unit 31 is activated (S27), the display indicating that the remote controller 41, the centralized controller 40 or the display means 631 is in the inspection mode is turned off (S28), and the inspection mode is terminated.
  • the display indicating the inspection mode may be turned off, and the return to the normal mode may be notified by display or sound. Thereby, it can be recognized that the inspector has returned to the normal mode.
  • the inspection mode may be terminated during the inspection in step S23.
  • how far the inspection has been performed may be stored in the storage unit 625, and the inspection may be continued from the next time the inspection mode is selected.
  • the inspection date and time and the inspection result in the inspection mode can be stored and displayed as data, or the form can be output to confirm that the inspection has been carried out reliably and its contents. be able to.
  • the single refrigerant sensor 52 is inspected.
  • the present invention is not limited to this.
  • the refrigerant sensors 51 to 54 in the air conditioning system 10 may be removed, put together in a container, and the reaction may be confirmed by spraying a refrigerant for inspection. With such a configuration, when there are a large number of refrigerant sensors, the inspection work can be performed efficiently.
  • the refrigerant sensor 52 may be calibrated based on the output value of the refrigerant sensor 52. Specifically, the concentration of the refrigerant sprayed on the refrigerant sensor 52 and the measured value of the refrigerant sensor 52 are displayed on the remote controller 41, the centralized controller 40, or the display means 631. Then, while watching the display, the refrigerant sensor 52 can be calibrated by operating the remote controller 41, the centralized controller 40 or the operating means 632 to increase or decrease the detection level of the refrigerant sensor 52. Alternatively, the refrigerant sensor 52 may be calibrated by bringing a separately calibrated densitometer and comparing and adjusting the values. Furthermore, two refrigerant
  • a mechanism for leaking a small amount of the refrigerant of the indoor unit 31 may be provided, and the refrigerant sensor 52 may be inspected using the refrigerant leaked from the indoor unit 31 in the inspection mode. In this case, the inspection can be automatically performed without blowing the refrigerant to the refrigerant sensor 52.
  • the fan 310 of the indoor unit 31 is stopped in step S22 of the inspection mode.
  • the operation of the indoor unit 31 may be stopped.
  • the shutoff valve 81 may be closed to stop the refrigerant flow to the indoor unit 31.
  • the indoor unit 31 not only the indoor unit 31 but also the other indoor units 32 or 33 may be stopped, or the outdoor unit 1, the shunt controller 2 and the indoor units 31 to 33 of the same refrigerant system may be stopped.
  • all the refrigerant systems may be stopped. It may be possible for the inspector to select which unit or system to stop.
  • FIG. 10 is a diagram showing an internal configuration of the refrigerant leak detection device 62B and devices connected to the refrigerant leak detection device 62B in the present embodiment.
  • the refrigerant leakage detection device 62B of the present embodiment includes two detection circuits 621a and 621b, and refrigerant sensors 52a and 52b are connected to the two detection circuits 621a and 621b, respectively.
  • the two detection circuits 621a and 621b have the same specifications.
  • the refrigerant sensors 52a and 52b are arranged in the same place (for example, the floor of the living room 102 or a wall near the floor).
  • the refrigerant sensor 52a is an expensive high precision sensor
  • the refrigerant sensor 52b is an inexpensive low precision sensor.
  • the control means 622 compares the output values of the detection circuits 621a and 621b with the set values, respectively, and determines that refrigerant leakage has occurred when either of them is greater than or equal to the set value.
  • the control means 622 compares the output values of the detection circuits 621a and 621b with the set values, respectively, and determines that refrigerant leakage has occurred when either of them is greater than or equal to the set value.
  • FIG. 11 is a graph showing the transition of the output values of the refrigerant sensors 52a and 52b.
  • the vertical axis indicates the sensor output value
  • the horizontal axis indicates time.
  • the output value of the refrigerant sensor 52a is indicated by a solid line
  • the output value of the refrigerant sensor 52b is indicated by a broken line.
  • the output value is in a state where the output value is fixed or only slightly fluctuated.
  • the present embodiment it is possible to detect refrigerant leakage even when any refrigerant sensor or detection circuit is in an abnormal state by duplicating the refrigerant sensor and the detection circuit. Reliability is improved. Further, by comparing the output values of the two refrigerant sensors, it is possible to determine which refrigerant sensor or detection circuit is in an abnormal state.
  • FIG. 12 is a diagram showing an internal configuration of the refrigerant leak detection device 62C and devices connected to the refrigerant leak detection device 62C in the present embodiment.
  • the refrigerant leakage detection device 62 ⁇ / b> C of the present embodiment includes two detection circuits 621 a and 621 b corresponding to one refrigerant sensor 52.
  • the control means 622 compares the output values of the detection circuits 621a and 621b with the set values, respectively, and determines that a refrigerant leak has occurred when either of them exceeds the set value.
  • a refrigerant leak has occurred when either of them exceeds the set value.
  • the refrigerant leakage can be detected even when any of the detection circuits is in an abnormal state by duplicating the detection circuit, and the reliability is improved. Further, by using one refrigerant sensor that is relatively unlikely to cause an abnormality, it is possible to reduce the number of parts and the cost.
  • FIG. 13 is a diagram showing an internal configuration of the refrigerant leak detection device 62D and devices connected to the refrigerant leak detection device 62D in the present embodiment.
  • the refrigerant leakage detection device 62D of the present embodiment further includes an input switching circuit 630.
  • a detection signal of the refrigerant sensor 52 and a reference voltage (for example, 2.5 V) from the power supply circuit 624 are input to the input switching circuit 630.
  • the input switching circuit 630 periodically switches the detection signal and reference voltage of the refrigerant sensor 52 under the control of the control means 622 and outputs the switching signal to the detection circuit 621.
  • the control means 622 monitors the output value of the detection circuit 621, and determines that the detection circuit 621 has failed when the output value when the reference voltage is input is different from the reference voltage. When it is determined that the detection circuit 621 has failed, the control unit 622 transmits a failure signal to the drive circuit 623.
  • the drive circuit 623 that has received the failure signal drives the signal output means 628 to close the shut-off valve 81, drives the signal output means 627 to operate the alarm device 72, and issues an alarm for notifying the failure.
  • an abnormality in the detection circuit can be quickly found, and the reliability can be improved.
  • FIG. 14 is a diagram showing an internal configuration of the refrigerant leak detection device 62E and devices connected to the refrigerant leak detection device 62E in the present embodiment.
  • the refrigerant leak detection device 62E of the present embodiment includes two detection circuits 621a and 621b and two input switching circuits 630a and 630b.
  • a detection signal of the refrigerant sensor 52 and a reference voltage (for example, 2.5 V) from the power supply circuit 624 are input to the input switching circuits 630a and 630b, respectively.
  • the input switching circuits 630a and 630b periodically switch the detection signal and reference voltage of the refrigerant sensor 52 under the control of the control means 622 and output them to the detection circuits 621a and 621b, respectively.
  • the communication line between the control means 622 and the input switching circuits 630a and 630b is omitted.
  • the control means 622 monitors the output values of the detection circuits 621a and 621b, and determines that the detection circuit 621a or 621b is out of order when the output value when the reference voltage is input is different from the reference voltage. When it is determined that the detection circuit 621a or 621b has failed, the control unit 622 transmits a failure signal to the drive circuit 623.
  • the drive circuit 623 that has received the failure signal drives the signal output means 628 to close the shut-off valve 81, drives the signal output means 627 to operate the alarm device 72, and issues an alarm for notifying the failure.
  • the present embodiment it is possible to quickly find an abnormality in the detection circuit. Further, by duplicating the detection circuit, it is possible to detect refrigerant leakage even when a failure occurs in any one of the detection circuits, and it is possible to further improve the reliability.
  • the presence or absence of the refrigerant leakage is determined based on the output value of the refrigerant sensor 52 that directly detects the refrigerant gas.
  • the refrigerant sensor 52 instead of the refrigerant sensor 52, the output of a pressure sensor, a temperature sensor, or the like.
  • the presence or absence of refrigerant leakage may be determined based on the value.
  • the control unit 622 may determine the presence or absence of refrigerant leakage by a known method based on the refrigerant temperature or the refrigerant pressure detected by the pressure sensor or the temperature sensor.
  • the refrigerant leak detection devices in the third to seventh embodiments may be used not only in a cooling system such as the air conditioning system 10 but also in a single cooling device such as a room air conditioner or a refrigerator.
  • the refrigerant sensor or the detection circuit is configured to be duplicated, but it may be tripled or more.
  • a configuration may be adopted in which a plurality of refrigerant detection devices arranged in a plurality of rooms are connected and managed by a detection system.
  • a plurality of refrigerant detection devices arranged in a plurality of rooms are connected and managed by a detection system.
  • the contact is “closed” at the time of leakage and failure, and the contact is “open” at the time of normal operation and power failure.
  • FIG. 15 is a schematic diagram when contacts of a plurality of refrigerant leak detection devices 60 are connected in series.
  • the contact output is opened at the time of leakage, and the contact Y is energized when the signal output means X in the detection system 500 is not excited. Thereby, the alarm device 510 is turned ON.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

L'invention concerne un système de détection de fuite de fluide frigorigène, grâce auquel l'emplacement et analogues, de fuites de fluide frigorigène peuvent être facilement saisis. Le système de détection de fuite de fluide frigorigène comprend : une pluralité de capteurs de fluide frigorigène disposés à des emplacements différents ; une pluralité de dispositifs de détection de fuite de fluide frigorigène qui déterminent la présence de fuites de fluide frigorigène, sur la base d'une sortie depuis la pluralité de capteurs de fluide frigorigène ; une pluralité d'alarmes qui émettent une alarme si une détermination a été faite selon laquelle une fuite de fluide frigorigène s'est produite, dans la pluralité de dispositifs de détection de fuite de fluide frigorigène ; et une pluralité de dispositifs de sécurité qui fonctionnent si une détermination a été faite selon laquelle une fuite de fluide frigorigène s'est produite, dans la pluralité de dispositifs de détection de fuite de fluide frigorigène. Une adresse est établie pour chaque dispositif de la pluralité de capteurs de fluide frigorigène, la pluralité de dispositifs de détection de fuite de fluide frigorigène, la pluralité d'alarmes et la pluralité de dispositifs de sécurité.
PCT/JP2015/068901 2015-06-30 2015-06-30 Système de détection de fuite de fluide frigorigène WO2017002215A1 (fr)

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GB1717831.0A GB2554267B (en) 2015-06-30 2015-06-30 Refrigerant leakage detection system
PCT/JP2015/068901 WO2017002215A1 (fr) 2015-06-30 2015-06-30 Système de détection de fuite de fluide frigorigène
JP2017525732A JPWO2017002215A1 (ja) 2015-06-30 2015-06-30 冷媒漏洩検知システム

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WO2018182037A1 (fr) 2017-03-31 2018-10-04 ダイキン工業株式会社 Procédé de détection de l'emplacement d'une fuite de réfrigérant
JP2018173249A (ja) * 2017-03-31 2018-11-08 ダイキン工業株式会社 冷凍装置の室内ユニット
JPWO2018220810A1 (ja) * 2017-06-02 2019-12-12 三菱電機株式会社 空気調和装置
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WO2023199719A1 (fr) * 2022-04-14 2023-10-19 三菱重工サーマルシステムズ株式会社 Système de climatisation et procédé de commande de système de climatisation
US11971183B2 (en) 2019-09-05 2024-04-30 Trane International Inc. Systems and methods for refrigerant leak detection in a climate control system
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JP6978696B2 (ja) * 2019-09-30 2021-12-08 ダイキン工業株式会社 空調換気システム
CN113028667A (zh) 2019-12-25 2021-06-25 开利公司 运输制冷系统以及用于运输制冷系统的can id分配方法
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JP2018173249A (ja) * 2017-03-31 2018-11-08 ダイキン工業株式会社 冷凍装置の室内ユニット
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