WO2023021882A1 - 空気調和装置 - Google Patents
空気調和装置 Download PDFInfo
- Publication number
- WO2023021882A1 WO2023021882A1 PCT/JP2022/027250 JP2022027250W WO2023021882A1 WO 2023021882 A1 WO2023021882 A1 WO 2023021882A1 JP 2022027250 W JP2022027250 W JP 2022027250W WO 2023021882 A1 WO2023021882 A1 WO 2023021882A1
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- WIPO (PCT)
- Prior art keywords
- refrigerant
- detection sensor
- refrigerant detection
- sensor
- unit
- Prior art date
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- 239000003507 refrigerant Substances 0.000 claims abstract description 253
- 238000001514 detection method Methods 0.000 claims abstract description 180
- 230000000903 blocking effect Effects 0.000 claims abstract description 29
- 230000006866 deterioration Effects 0.000 claims description 41
- 239000000463 material Substances 0.000 claims description 6
- 239000000758 substrate Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 210000000078 claw Anatomy 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- 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
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/005—Arrangement or mounting of control or safety devices of safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Definitions
- the present disclosure relates to an air conditioner.
- Patent Document 1 discloses an air conditioner equipped with a detection sensor that detects the concentration of refrigerant.
- Patent Literature 1 describes a configuration in which a plurality of refrigerant detection sensors for detecting leakage of combustible refrigerant are provided at the same location. With such a configuration, one of the two refrigerant detection sensors having a relatively short life is used, and if one of the refrigerant detection sensors fails during use, the other refrigerant detection sensor is used to detect the refrigerant. Efforts have been made to extend the life of the sensor (see, for example, Patent Document 1).
- the present disclosure provides an air conditioner that suppresses performance deterioration of a refrigerant detection sensor due to deterioration over time and improves safety against refrigerant leakage.
- the air conditioner of the present disclosure connects the indoor heat exchanger of the indoor unit and the outdoor heat exchanger, compressor, and throttle device of the outdoor unit via refrigerant piping, and uses a flammable refrigerant as the refrigerant.
- the air conditioner includes a first refrigerant detection sensor and a second refrigerant detection sensor that detect refrigerant leakage.
- the second refrigerant detection sensor is provided with an outside air blocking portion for blocking outside air to the sensor portion of the second refrigerant detection sensor, and a canceling portion for canceling the blockage of outside air by the outside air blocking portion.
- aging deterioration of the second refrigerant detection sensor can be suppressed by blocking outside air with the outside air blocking portion while the first refrigerant detection sensor is operating. Therefore, safety against refrigerant leakage can be improved.
- FIG. 1 is a side sectional view of an indoor unit of an air conditioner according to Embodiment 1.
- FIG. 2 is a configuration diagram showing an outline of a refrigerant detection sensor of the air conditioner according to Embodiment 1.
- FIG. 3 is a block diagram showing a control configuration of the air conditioner according to Embodiment 1.
- FIG. 4 is a graph showing an example of deterioration determination of a refrigerant detection sensor of the air conditioner according to Embodiment 1.
- the present disclosure provides an air conditioner capable of suppressing performance deterioration of a refrigerant detection sensor due to deterioration over time and improving safety against refrigerant leakage.
- [1-1. composition] 1 is a cross-sectional view showing an indoor unit of an air conditioner according to Embodiment 1.
- FIG. FIG. 3 is a block diagram showing the control configuration of the air conditioner 1 according to Embodiment 1. As shown in FIG.
- the air conditioner 1 includes an indoor unit 10.
- the indoor unit 10 has a configuration as shown in a sectional view in FIG.
- the indoor unit 10 includes a housing 11 attached to an indoor wall surface.
- the upper surface of the housing 11 is provided with an intake port 12 for sucking the indoor air.
- the lower surface of the housing 11 is provided with an air outlet 13 for blowing air into the room. Both the air intake port 12 and the air outlet 13 are formed over the entire width of the housing 11 .
- An indoor heat exchanger 14 is housed inside the housing 11 .
- the indoor heat exchanger 14 is formed in a substantially inverted V shape when viewed from the side.
- the indoor heat exchanger 14 is arranged so as to partition the space between the air inlet 12 and the air outlet 13 inside the housing 11 . Thereby, the indoor air sucked from the intake port 12 always passes through the indoor heat exchanger 14 before reaching the blowout port 13 .
- An indoor blower 15 is arranged inside the indoor heat exchanger 14 .
- the indoor blower 15 is rotationally driven by a blower drive motor (not shown), so that the indoor air is sucked in through the air intake port 12, and the heat-exchanged air that passes through the indoor heat exchanger 14 is blown into the room through the air outlet 13. is configured to
- a filter 16 is arranged in the intake port 12 .
- the filter 16 is made of a flexible material and removes dust and the like from the air sucked from the air inlet 12 .
- a cleaning drive roller 17 is rotatably provided in front of the filter 16 .
- the cleaning drive roller 17 is rotationally driven to roll up the filter 16 , thereby cleaning the filter 16 of dirt such as dust adhering to it.
- a left-right wind direction plate 18 for adjusting the wind direction of the blown air in the left-right direction is provided so as to be swingable in the left-right direction.
- the left/right wind direction plate 18 is configured such that the wind direction can be adjusted manually.
- a vertical wind direction plate 19 for adjusting the vertical wind direction of blown air is provided in a freely swingable manner below the left and right wind direction plates 18 .
- the vertical wind direction plate 19 is configured such that the wind direction in the vertical direction can be automatically adjusted by a wind direction plate driving motor (not shown).
- the air conditioner 1 includes an outdoor unit 30.
- the outdoor unit 30 includes a compressor 31 , an outdoor heat exchanger (not shown), an outdoor fan 32 that sends outside air to the outdoor heat exchanger, an expansion mechanism (throttling device) 33 , and a four-way valve 34 .
- the outdoor unit 30 and the indoor unit 10 are connected by a refrigerant pipe 21 (see FIG. 1) to form a predetermined refrigeration cycle circuit.
- a combustible refrigerant is used as the refrigerant that circulates in the refrigeration cycle circuit.
- the indoor unit 10 includes a refrigerant cutoff valve 20, as shown in FIG.
- the refrigerant shutoff valve 20 is closed to shut off the refrigerant flowing through the refrigerant pipe 21 when refrigerant leakage occurs in the indoor unit 10 .
- the refrigerant cutoff valve 20 may be installed in the outdoor unit 30 .
- a first refrigerant detection sensor 40 and a second refrigerant detection sensor 41 are arranged inside the housing 11 and near the indoor heat exchanger 14.
- the first refrigerant detection sensor 40 is a sensor that is used from the start of use of the indoor unit 10
- the second refrigerant detection sensor 41 is a sensor that is used when the first refrigerant detection sensor 40 becomes unusable. be.
- the first refrigerant detection sensor 40 is arranged near the connection point between the indoor unit 10 and the refrigerant pipe 21 that connects the outdoor unit 30 and the indoor unit 10 . This is because refrigerant leakage is more likely to occur at the connection point between the indoor heat exchanger 14 and the refrigerant pipe 21 in the initial period of use of the indoor unit 10 compared to other points.
- the second refrigerant detection sensor 41 is arranged near the bend position where the refrigerant pipe 21 inside the indoor heat exchanger 14 turns. This is because the bend position is a location where refrigerant leakage is likely to occur due to aged deterioration of the refrigerant pipe 21 of the indoor heat exchanger 14 .
- the first refrigerant detection sensor 40 can detect leakage of the refrigerant due to the initial use of the indoor unit 10, and the second refrigerant detection sensor 40 can The detection sensor 41 makes it possible to detect leakage of the refrigerant due to aging deterioration of the indoor unit 10 .
- the second refrigerant detection sensor 41 may be installed at the same location as the first refrigerant detection sensor 40 .
- the second refrigerant detection sensor 41 detects the refrigerant under the same conditions as the first refrigerant detection sensor 40. Therefore, it is possible to suppress the occurrence of detection errors due to differences in installation locations.
- the same location means that the surrounding environment of the first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 is the same. It is within the range where refrigerant leakage can be detected.
- FIG. 2 is a configuration diagram showing a schematic configuration of the first refrigerant detection sensor 40 and the second refrigerant detection sensor 41. As shown in FIG.
- each of the first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 has a predetermined sensor substrate 42 .
- a sensor portion 42 a made of a semiconductor is mounted on the sensor substrate 42 .
- a substantially cylindrical sensor case 43 covering the sensor portion 42a is attached around the sensor portion 42a.
- a mesh-like opening 44 is formed at the tip of the sensor case 43 . As a result, the leaked refrigerant entering from the opening 44 is detected by the sensor portion 42a.
- a heater (not shown) is arranged in the vicinity of the sensor portion 42a.
- the second refrigerant detection sensor 41 has an external air blocking part 45 that closes the opening 44 .
- the external air blocker 45 includes, for example, a lid member 46 that closes the opening 44 , an elastic member 47 such as a spring that biases the lid member 46 and the opening 44 so as to open the lid member 46 and the opening 44 . and a lid holding member (not shown) that holds the lid.
- the external air blocking section 45 includes a release section (release mechanism) 48 that releases the external air blocking section 45 .
- the cover holding member of the external air blocking section 45 has a structure that holds the cover member 46 on the sensor case 43 .
- the lid holding member holds the lid member 46 to the sensor case 43 with resin that melts at a predetermined temperature, for example.
- the release unit 48 in this case is configured by a heater or the like that melts the resin.
- the release unit 48 electrically locks the holding claw. It consists of a solenoid for releasing.
- the lid member 46 is made of a shape-memory metal in which the opened state of the lid member 46 and the opening 44 is memorized, and the lid member 46 is heated and deformed by a release unit 48 such as a heater to open the lid member 46 and the opening 44 . 44 may be opened.
- the outside air blocking part 45 may be provided with a moisture proof material inside the lid member 46 .
- a moisture proof material inside the lid member 46 .
- the lid member 46 of the external air blocking part 45 may be made of a material that blocks light and heat. This makes it possible to block light and heat that may accelerate deterioration of the second refrigerant detection sensor 41 when the second refrigerant detection sensor 41 is not in use. Therefore, deterioration of the second refrigerant detection sensor 41 can be suppressed.
- FIG. 3 is a block diagram showing the control configuration of this embodiment.
- the indoor unit 10 includes a control section 50.
- the control unit 50 controls each device of the air conditioner 1 .
- the controller 50 comprises a processor and memory. Control by the control unit 50 is executed by the processor processing programs stored in the memory.
- the controller has a timer 51 .
- a first refrigerant detection sensor 40 and a second refrigerant detection sensor 41 are connected to the controller 50 .
- the control unit 50 includes a communication unit 52.
- the communication unit 52 can communicate with a remote controller 53 operated by a user. That is, the control unit 50 controls the compressor 31 of the outdoor unit 30, the outdoor fan 32, the expansion mechanism 33, the four-way valve 34, and the indoor unit based on the set temperature input by the remote controller 53 by the operation of the remote controller 53 by the user. 10 of the indoor fan 15 and the up/down wind direction plate 19 are controlled.
- the control unit 50 controls the refrigerant cutoff valve 20 to close.
- the control unit 50 counts the drive time of the first refrigerant detection sensor 40 using the timer 51 of the control unit 50 . For example, the control unit 50 counts until the driving time of the first refrigerant detection sensor 40 reaches five years, which is the service life of the first refrigerant detection sensor 40 .
- the control unit 50 drives the release unit 48 to release the cover member 46 when the driving time of the first refrigerant detection sensor 40 reaches five years. Thereby, refrigerant leakage can be detected by the second refrigerant detection sensor 41 .
- control unit 50 determines deterioration of the first refrigerant detection sensor 40 based on the output of the first refrigerant detection sensor 40 .
- FIG. 4 is a graph showing an example of deterioration determination of the first refrigerant detection sensor 40.
- the sensor output of the first refrigerant detection sensor 40 increases in proportion to the concentration of the refrigerant from 0 at the time of shipment.
- the control unit 50 when the concentration of the leaking refrigerant is between 1/100LFL (LFL: minimum flammable concentration) and the sensor output corresponding to 1/4LFL, alarms that the refrigerant is leaking. I do.
- the control unit 50 performs deterioration determination using the deterioration determination threshold value set for the sensor output at the 0 point. Specifically, for example, when the sensor output at point 0 exceeds the threshold value for determining deterioration, the control unit 50 determines that the state in which the sensor output exceeds the threshold value for determining deterioration is a predetermined time or more, for example, 24 hours or more. , it is determined that the sensor is degraded.
- the reason why it is determined that the sensor is degraded when the sensor output exceeds the degradation determination threshold for a predetermined time or longer is as follows. That is, although the temperature cycle of one day causes some changes in the sensor output, if the sensor output continues to exceed the threshold value for determining deterioration for, for example, 24 hours, it is not considered to be affected by the temperature cycle of one day. This is because it is conceivable.
- the threshold value for determining deterioration of the sensor is set to a value lower than the output of the sensor that issues a refrigerant leakage alarm.
- the first refrigerant detection sensor 40 when the air conditioner 1 is installed, the first refrigerant detection sensor 40 is operated, and the controller 50 detects refrigerant leakage based on the output value of the first refrigerant detection sensor 40. Determine presence/absence.
- the control unit 50 counts the driving time from the installation of the first refrigerant detection sensor 40 by the timer 51 .
- control unit 50 By driving the compressor 31, the outdoor fan 32, the expansion mechanism 33, the four-way valve 34, and the indoor fan 15, the control unit 50 performs cooling and heating according to the room temperature set by the remote controller 53.
- control unit 50 monitors refrigerant leakage from the indoor unit 10 using the first refrigerant detection sensor 40, and when the first refrigerant detection sensor 40 detects refrigerant leakage, the control unit 50 closes the refrigerant cutoff valve 20. Control.
- the second refrigerant detection sensor 41 stops operating. At this time, since the second refrigerant detection sensor 41 is cut off from contact with the outside air by the outside air blocking portion 45, aging deterioration of the second refrigerant detection sensor 41 is suppressed when the operation of the second refrigerant detection sensor 41 is stopped. be able to.
- the control unit 50 drives the release unit 48 of the second refrigerant detection sensor 41 to turn the lid member 46 on. is released, the detection of refrigerant leakage by the second refrigerant detection sensor 41 is enabled.
- control unit 50 determines deterioration of the first refrigerant detection sensor 40 based on the output of the first refrigerant detection sensor 40 .
- the control unit 50 sets a deterioration determination threshold for the sensor output at the 0 point. Then, when the sensor output at point 0 exceeds the threshold value for determining deterioration, and the state in which the sensor output exceeds the threshold value for determining deterioration continues for a predetermined time or longer (for example, 24 hours or longer), the control unit 50 Then, it is determined that the first refrigerant detection sensor 40 has deteriorated.
- control unit 50 determines that the first refrigerant detection sensor 40 has deteriorated
- the control unit 50 drives the release unit 48 to release the cover member 46 of the second refrigerant detection sensor 41, thereby enabling the second refrigerant detection sensor 40 to operate. 41 to detect refrigerant leakage.
- the deterioration determination determines that the first refrigerant detection sensor 40 has deteriorated before the count value of the driving time by the timer 51 has passed five years, the first refrigerant detection sensor 40 is detected based on the deterioration determination. Switching from the sensor 40 to the second refrigerant detection sensor 41 is performed.
- switching from the first refrigerant detection sensor 40 to the second refrigerant detection sensor 41 is performed when the count value of the integrated driving time by the timer 51 reaches a predetermined value, or when it is determined that the refrigerant has deteriorated.
- the control unit 50 transmits a notification to the remote controller 53 or to a maintenance management company or the like that the driving of the first refrigerant detection sensor 40 has been stopped and switched to the second refrigerant detection sensor 41. You may make it
- control unit 50 may perform deterioration determination for the second refrigerant detection sensor 41 after the switching from the first refrigerant detection sensor 40 to the second refrigerant detection sensor 41 is completed.
- the control unit 50 determines that the air conditioner 1 cannot be used continuously, and cuts off the refrigerant.
- the valve 20 is closed and controlled so that the air conditioner 1 cannot be used. Thereby, the safety against refrigerant leakage can be improved.
- the indoor heat exchanger 14 included in the indoor unit 10 and the outdoor heat exchanger, the compressor, and the expansion device included in the outdoor unit 30 are connected to the refrigerant pipe. 21, and a combustible refrigerant is used as the refrigerant.
- the air conditioner 1 further includes a first refrigerant detection sensor 40 and a second refrigerant detection sensor that detect refrigerant leakage.
- the second refrigerant detection sensor is provided with an outside air blocking portion 45 for blocking outside air to the sensor portion 42a of the second refrigerant detection sensor 41, and a canceling portion 48 for canceling the blockage of the outside air by the outside air blocking portion 45.
- the second refrigerant detection sensor 41 can be prevented from deteriorating over time by shutting off the outside air with the outside air blocking portion 45 . Therefore, when the second refrigerant detection sensor 41 is operated, erroneous detection due to aged deterioration is suppressed. Therefore, refrigerant leakage can be detected appropriately, and safety against refrigerant leakage can be improved.
- first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 may be installed at the same location.
- detection is performed using the second refrigerant detection sensor 41 under the same conditions as the first refrigerant detection sensor 40. Therefore, it is possible to suppress the occurrence of detection errors due to differences in installation locations.
- the first refrigerant detection sensor 40 is installed near the connection point of the refrigerant pipe 21 that connects the indoor unit 10 and the outdoor unit 30 .
- the second refrigerant detection sensor 41 is installed near the bend position of the refrigerant pipe 21 of the indoor heat exchanger 14 .
- the first refrigerant detection sensor 40 can appropriately detect leakage of the refrigerant due to the initial use of the indoor unit 10 .
- the second refrigerant detection sensor 41 can appropriately detect leakage of refrigerant due to aged deterioration of the refrigerant pipe 21 .
- a control unit 50 to which the sensor outputs of the first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 are input is provided.
- the control unit 50 determines that the first refrigerant detection sensor has exceeded the threshold value for determining deterioration for a predetermined period of time (for example, 24 hours or more)
- the control unit 50 operates the releasing unit 48 to remove the outside air blocking unit 45. , switch to refrigerant leakage monitoring using the second refrigerant detection sensor.
- the threshold value for determining deterioration is set to a value lower than the sensor output at which the first refrigerant detection sensor 40 detects refrigerant leakage and issues a warning.
- deterioration determination of the first refrigerant detection sensor 40 can be performed.
- erroneous detection of refrigerant leakage by the deteriorated first refrigerant detection sensor 40 can be avoided, and erroneous detection due to aged deterioration of the first refrigerant detection sensor 40 can be suppressed. Therefore, safety against refrigerant leakage can be improved.
- control unit 50 includes a timer 51 .
- the control unit 50 counts the driving time of the first refrigerant detection sensor 40 by the timer 51, and when it is determined that the driving time of the first refrigerant detection sensor 40 has passed the predetermined driving time, the control unit 50 operates the release unit 48 to operate the outside air.
- the interrupter 45 is removed, and the monitoring of refrigerant leakage using the second refrigerant detection sensor is switched to.
- Control is performed to close the refrigerant cutoff valve 20 .
- the air conditioner 1 cannot be used, and safety against refrigerant leakage can be improved.
- Embodiment 1 has been described as an example of the technology disclosed in the present application.
- the technology in the present disclosure is not limited to this, and can also be applied to embodiments with modifications, replacements, additions, omissions, and the like.
- the first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 are generally configured by inserting and connecting pins of the sensor board 42 to connectors provided on the control board.
- the sensor substrate 42 may be insulated by inserting an insulating film or the like into the connection between the sensor substrate 42 of the second refrigerant detection sensor 41 and the control substrate. As a result, the sensor substrate 42 can be prevented from being energized, and the external air blocking section 45 also blocks the external air. Therefore, it is possible to maintain the second refrigerant detection sensor 41 substantially in the state at the time of shipment.
- the air conditioner according to the present disclosure can suppress performance deterioration due to aging deterioration of the refrigerant detection sensor and improve safety against refrigerant leakage, so it can be suitably used for various air conditioners. is.
- Reference Signs List 1 air conditioner 10 indoor unit 11 housing 12 intake port 13 outlet 14 indoor heat exchanger 15 indoor blower 16 filter 17 cleaning drive roller 18 left/right wind direction plate 19 up/down direction plate 20 refrigerant cutoff valve 21 refrigerant pipe 30 outdoor unit 31 compression machine 32 outdoor fan 33 expansion mechanism (expansion device) 34 four-way valve 40 first refrigerant detection sensor 41 second refrigerant detection sensor 42 sensor substrate 42a sensor portion 43 sensor case 44 opening 45 external air blocking portion 46 lid member 47 elastic member 48 release portion 50 control portion 51 timer 52 communication portion 53 remote controller
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Abstract
Description
発明者らが本開示に想到するに至った当時、前述のように、可燃性冷媒の漏洩を検知する冷媒検出センサを同一箇所に複数備え、寿命が比較的短い2つの冷媒検出センサの一方が用いられ、その使用中の一方の冷媒検出センサが故障した場合に他方の冷媒検出センサが用いられることで、冷媒検出センサの長寿命化を図る技術があった。
以下、図面を用いて、実施の形態1を説明する。
図1は、実施の形態1に係る空気調和装置の室内機を示す断面図である。図3は、実施の形態1に係る空気調和装置1の制御構成を示すブロック図である。
次に、実施の形態1の空気調和装置1の動作について説明する。
以上のように、本出願において開示する技術の例示として、実施の形態1を説明した。しかしながら、本開示における技術は、これに限定されず、変更、置き換え、付加、省略などを行った実施の形態にも適用できる。また、上記実施の形態1で説明した各構成要素を組み合わせて、新たな実施の形態とすることも可能である。
10 室内機
11 筐体
12 吸気口
13 吹出口
14 室内熱交換器
15 室内送風機
16 フィルタ
17 クリーニング駆動ローラ
18 左右風向板
19 上下風向板
20 冷媒遮断弁
21 冷媒配管
30 室外機
31 圧縮機
32 室外送風機
33 膨張機構(絞り装置)
34 四方弁
40 第1冷媒検出センサ
41 第2冷媒検出センサ
42 センサ基板
42a センサ部
43 センサケース
44 開口
45 外気遮断部
46 蓋部材
47 弾性部材
48 解除部
50 制御部
51 タイマ
52 通信部
53 リモコン
Claims (8)
- 室内機が有する室内熱交換器と、室外機が有する室外熱交換器、圧縮機、および絞り装置と、を備え、
前記室内熱交換器と、前記室外熱交換器、前記圧縮機、および前記絞り装置とが冷媒配管を介して接続され、
冷媒として可燃性冷媒が用いられた空気調和装置であって、
冷媒の漏洩を検出するセンサ部をそれぞれ有する、第1冷媒検出センサおよび第2冷媒検出センサを備え、
前記第2冷媒検出センサは、前記第2冷媒検出センサの前記センサ部への外気を遮断する外気遮断部と、前記外気遮断部による外気の遮断を解除する解除部と、を有する、
空気調和装置。 - 前記第1冷媒検出センサと前記第2冷媒検出センサとは、同一箇所に配置されている、
請求項1に記載の空気調和装置。 - 前記第1冷媒検出センサは、前記室内機と前記室外機とを接続する前記冷媒配管と前記室内機との接続箇所の近傍に配置され、
前記第2冷媒検出センサは、前記室内熱交換器における前記冷媒配管のベンド位置の近傍に設置される、
請求項1に記載の空気調和装置。 - 前記第1冷媒検出センサおよび前記第2冷媒検出センサのセンサ出力が入力される制御部をさらに備え、
前記制御部は、前記第1冷媒検出センサによる出力が所定時間以上、劣化判断用の閾値を超えていると判断した場合に、前記解除部を動作させて前記外気遮断部を除去させ、前記第2冷媒検出センサを用いた冷媒の漏洩の検出に切り換えるように構成されており、
劣化判断用の前記閾値は、第1冷媒検出センサが冷媒の漏洩を検出して発報を行うセンサ出力より低い値に設定されている、
請求項1から請求項3のいずれか一項に記載の空気調和装置。 - 前記制御部は、タイマを備え、
前記制御部は、前記タイマにより前記第1冷媒検出センサの駆動時間をカウントし、前記第1冷媒検出センサの駆動時間が所定駆動時間を経過したと判断した場合、前記解除部を動作させて前記外気遮断部を除去させ、前記第2冷媒検出センサを用いた冷媒の漏洩の検出に切り換えるように構成されている、
請求項4に記載の空気調和装置。 - 前記外気遮断部の内部に、防湿材が配置されている、
請求項1から請求項5のいずれか一項に記載の空気調和装置。 - 前記外気遮断部は、光および熱を遮断する材料で構成されている、
請求項1から請求項6のいずれか一項に記載の空気調和装置。 - 前記室内機への前記冷媒配管に設けられた冷媒遮断弁をさらに備え、
前記制御部は、前記第1冷媒検出センサおよび前記第2冷媒検出センサのいずれもが劣化したと判断した場合、前記冷媒遮断弁に閉動作させるように制御する。
請求項1から請求項7のいずれか一項に記載の空気調和装置。
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JP2014224612A (ja) | 2011-09-16 | 2014-12-04 | パナソニック株式会社 | 空気調和機 |
JP2017180927A (ja) * | 2016-03-29 | 2017-10-05 | 株式会社富士通ゼネラル | 空気調和機 |
JP2018132254A (ja) * | 2017-02-15 | 2018-08-23 | 三菱電機株式会社 | 環境監視装置 |
JP2018162912A (ja) * | 2017-03-24 | 2018-10-18 | 三菱電機株式会社 | 環境監視装置 |
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