CN117795263A - Air conditioner - Google Patents
Air conditioner Download PDFInfo
- Publication number
- CN117795263A CN117795263A CN202280054460.5A CN202280054460A CN117795263A CN 117795263 A CN117795263 A CN 117795263A CN 202280054460 A CN202280054460 A CN 202280054460A CN 117795263 A CN117795263 A CN 117795263A
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- China
- Prior art keywords
- refrigerant
- detection sensor
- refrigerant detection
- unit
- sensor
- 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.)
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- 239000003507 refrigerant Substances 0.000 claims abstract description 255
- 238000001514 detection method Methods 0.000 claims abstract description 181
- 230000000903 blocking effect Effects 0.000 claims abstract description 32
- 230000015556 catabolic process Effects 0.000 claims description 34
- 238000006731 degradation reaction Methods 0.000 claims description 34
- 238000004378 air conditioning Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 230000006866 deterioration Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 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
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Landscapes
- 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)
Abstract
An air conditioner using a flammable refrigerant as a refrigerant includes a first refrigerant detection sensor (40) and a second refrigerant detection sensor (41) that detect leakage of the refrigerant. An outside air blocking unit (45) that blocks the sensor unit (42 a) of the second refrigerant detection sensor (41) from outside air is provided in the second refrigerant detection sensor (41); and a release unit (48) for releasing the external air from the external air blocking unit (45).
Description
Technical Field
The present invention relates to an air conditioner.
Background
Patent document 1 discloses an air conditioning apparatus including a detection sensor that detects the concentration of a refrigerant. Patent document 1 describes a configuration in which a plurality of refrigerant detection sensors for detecting leakage of a flammable refrigerant are provided at the same portion. According to such a configuration, one of the 2 refrigerant detection sensors having a short service life is used when one refrigerant detection sensor fails during use, thereby realizing a longer service life of the refrigerant detection sensor (for example, refer to patent document 1).
Prior art literature
Patent literature
Patent document 1 Japanese patent application laid-open No. 2014-224612
Disclosure of Invention
The invention provides an air conditioner which can inhibit performance degradation of a refrigerant detection sensor caused by aging degradation and improve safety on refrigerant leakage.
An air conditioner is configured such that an indoor heat exchanger provided in an indoor unit, an outdoor heat exchanger provided in an outdoor unit, a compressor, and a throttle device are connected via refrigerant piping, and a flammable refrigerant is used as a refrigerant, and the air conditioner includes a first refrigerant detection sensor and a second refrigerant detection sensor that detect leakage of the refrigerant. The second refrigerant detection sensor is provided with an outside air blocking portion that blocks the sensor portion of the second refrigerant detection sensor from outside air, and a release portion that releases the blocking of outside air by the outside air blocking portion.
According to the present invention, by blocking outside air by the outside air blocking portion during operation (operation) of the first refrigerant detection sensor, aged deterioration of the second refrigerant detection sensor can be suppressed. Therefore, the safety against refrigerant leakage can be improved.
Drawings
Fig. 1 is a side sectional view of an indoor unit of an air conditioner according to embodiment 1.
Fig. 2 is a schematic configuration diagram showing a refrigerant detection sensor of the air conditioner according to embodiment 1.
Fig. 3 is a block diagram showing a control structure of the air conditioner according to embodiment 1.
Fig. 4 is a diagram showing an example of degradation determination of the refrigerant detection sensor of the air conditioner according to embodiment 1.
Detailed Description
(knowledge and the like underlying the present invention)
In the present inventors, as described above, there has been a technique in which a plurality of refrigerant detection sensors for detecting leakage of a flammable refrigerant are provided at the same portion, one of the two refrigerant detection sensors having a short service life is used when one refrigerant detection sensor fails during use of the refrigerant detection sensor, and the other refrigerant detection sensor is used to extend the service life of the refrigerant detection sensor.
However, in the conventional technology, when a semiconductor type refrigerant detection sensor is used, even if the refrigerant detection sensor does not operate, erroneous detection may easily occur in the subsequent operation due to deterioration of the adsorption capacity of a foreign gas (a generic term for gases other than the detection target such as water vapor, oil smoke, alcohol, and exhaust gas generated during cooking) filter, deterioration of the catalyst activity of the sensor material, and the like. Accordingly, the inventors found the following problems: even if a plurality of refrigerant detection sensors are provided, the performance of the other refrigerant detection sensor used after one of them fails cannot be fully exerted, and the life-prolonging effect is limited. The inventors have made the present invention in order to solve this problem.
The invention provides an air conditioner, which can inhibit performance degradation of a refrigerant detection sensor caused by aging degradation and improve safety for refrigerant leakage.
The embodiments are described in detail below with reference to the drawings. However, unnecessary detailed description may be omitted. For example, a detailed description of known matters or a repeated description of substantially the same structure may be omitted. This is to avoid the following description being too lengthy to facilitate understanding by those skilled in the art.
The drawings and the following description are provided to facilitate a full understanding of the present invention by those skilled in the art, and are not intended to limit the contents recited in the claims.
(embodiment 1)
Next, embodiment 1 will be described with reference to the drawings.
[1-1. Structure ]
Fig. 1 is a cross-sectional view showing an indoor unit of an air conditioner according to embodiment 1. Fig. 3 is a block diagram showing a control structure of the air conditioner 1 according to embodiment 1.
As shown in fig. 3, the air conditioner 1 includes an indoor unit 10. The indoor unit 10 has a structure shown in a sectional view in fig. 1. The indoor unit 10 includes a casing 11 mounted on a wall surface of a room.
An air inlet 12 for sucking in indoor air is provided on the upper surface of the housing 11. A blowout port 13 for blowing air into the room is provided on the lower surface of the housing 11. The air inlet 12 and the air outlet 13 are formed over the entire width of the housing 11.
An indoor heat exchanger 14 is housed in the casing 11. The indoor heat exchanger 14 is formed in a substantially inverted V shape in a side view. The indoor heat exchanger 14 is disposed so as to separate a space between the air inlet 12 and the air outlet 13 in the casing 11. Thus, the indoor air sucked through the inlet 12 must pass through the indoor heat exchanger 14 while being sent to the outlet 13.
An indoor fan 15 is disposed inside the indoor heat exchanger 14. The indoor fan 15 is rotationally driven by a fan drive motor, not shown, and sucks in indoor air from the intake port 12, and blows out the air, which has been heat-exchanged by the indoor heat exchanger 14, from the blowout port 13 into the room.
A filter 16 is disposed in the inlet 12. The filter 16 is made of a flexible material, and removes dust and the like from the air sucked through the air inlet 12.
At the front portion of the filter 16, a scrub drive roller 17 is rotatably provided. The cleaning drive roller 17 is driven to rotate to wind up the filter 16, so that dirt such as dust adhering to the filter 16 can be cleaned.
A horizontal louver 18 for adjusting the horizontal direction of the blown air is provided in the vicinity of the air outlet 13 so as to be swingable in the horizontal direction. The horizontal wind vane 18 is configured to be manually adjustable in wind direction.
A vertical louver 19 for adjusting the vertical direction of the blown air is swingably provided below the horizontal louver 18. The up-down wind direction plate 19 is configured to automatically adjust the wind direction in the up-down direction by a wind direction plate driving motor, not shown.
As shown in fig. 3, 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 (throttle 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 constitute a predetermined refrigeration cycle. As the refrigerant circulating in the refrigeration cycle, a flammable refrigerant is used.
In the present embodiment, as shown in fig. 3, the indoor unit 10 includes a refrigerant shut valve 20. The refrigerant shut-off valve 20 is configured to perform a closing operation when the indoor unit 10 has leaked refrigerant, and shut off the refrigerant flowing through the refrigerant pipe 21. The refrigerant shut-off valve 20 may be provided in the outdoor unit 30.
In addition, a first refrigerant detection sensor 40 and a second refrigerant detection sensor 41 are disposed in the vicinity of the indoor heat exchanger 14 inside the casing 11. The first refrigerant detection sensor 40 is a sensor used from the start of the use of the indoor unit 10, and the second refrigerant detection sensor 41 is a sensor used when the first refrigerant detection sensor 40 cannot be used.
In the present embodiment, the first refrigerant detection sensor 40 is disposed in the vicinity of a connection point between the refrigerant pipe 21 connecting the outdoor unit 30 and the indoor unit 10. This is because refrigerant leakage is likely to occur at the initial stage of use of the indoor unit 10 at the connection point between the indoor heat exchanger 14 and the refrigerant pipe 21, as compared with other points.
The second refrigerant detection sensor 41 is disposed in the vicinity of the bent pipe position where the refrigerant pipe 21 is folded back in the indoor heat exchanger 14. This is because the bent pipe position is a portion where refrigerant leakage is likely to occur due to aged deterioration of the refrigerant pipe 21 of the indoor heat exchanger 14.
By disposing the first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 in this manner, it is possible to detect leakage of refrigerant occurring due to initial use of the indoor unit 10 by the first refrigerant detection sensor 40, and to detect leakage of refrigerant occurring due to aged deterioration of the indoor unit 10 by the second refrigerant detection sensor 41.
The second refrigerant detection sensor 41 may be provided at the same position as the first refrigerant detection sensor 40. In this case, when the first refrigerant detection sensor 40 becomes unusable and the refrigerant leakage is switched to detection by the second refrigerant detection sensor 41, the second refrigerant detection sensor 41 can detect the refrigerant leakage under the same conditions as the first refrigerant detection sensor 40, and therefore, occurrence of detection errors due to differences in installation places can be suppressed. In the present embodiment, the same portion means that the first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 have the same surrounding environment, and therefore the first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 can detect the range of refrigerant leakage under the same condition.
As shown in fig. 2, the first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 each include a prescribed sensor circuit board 42. The sensor circuit board 42 is mounted with a sensor portion 42a formed of a semiconductor. A substantially cylindrical sensor case 43 covering the sensor portion 42a is attached around the sensor portion 42a. A mesh-shaped opening 44 is formed at the front end of the sensor case 43. Thus, the sensor portion 42a can detect the leaked refrigerant that has entered (entered) from the opening 44.
In order to operate the sensor portion 42a, the sensor portion 42a needs to be heated to a predetermined temperature. Therefore, a heater, not shown, is disposed in the vicinity of the sensor portion 42a.
The second refrigerant detection sensor 41 has an outside air blocking portion 45 that closes the opening 44. The outside air blocking portion 45 is constituted by, for example, a cover member 46 closing the opening 44, an elastic member 47 such as a spring for urging the cover member 46 and the opening 44 to open, and a cover holding member (not shown) for holding the cover member 46 in a closed state of the opening 44. The outside air blocking portion 45 includes a release portion (release mechanism) 48 for releasing the outside air blocking portion 45.
In the present embodiment, a case will be described in which the lid holding member of the outside air blocking portion 45 holds the lid member 46 in the sensor case 43. The cover holding member holds the cover member 46 to the sensor case 43 with, for example, a resin that melts at a prescribed temperature. The release portion 48 in this case is constituted by a heater or the like for melting the resin. In the case where the lid holding member of the outside air blocking portion 45 is configured to lock and hold the lid member 46 to the sensor case 43 by, for example, a holding claw or the like, the release portion 48 is configured by a solenoid or the like that electrolytically releases the locking of the holding claw.
As the other configuration of the release portion 48, for example, a configuration may be adopted in which the cover member 46 can be electrically opened and closed without providing the elastic member 47. Alternatively, for example, the lid member 46 is made of a shape memory metal which memorizes a state in which the lid member 46 and the opening 44 are opened, and the opening 44 is opened by heating the lid member 46 with a releasing portion 48 such as a heater to deform the same.
When the cover holding member of the outside air blocking portion 45 is released by the releasing portion 48, the cover member 46 moves to a position spaced apart from the sensor case 43 due to the elastic force of the elastic member 47. Thereby, leakage of the refrigerant can be detected through the opening 44 of the sensor case 43.
The outside air blocking portion 45 may be provided with a moisture-proof material (moisture-proof material) inside the cover member 46. This can remove moisture that may promote degradation of the second refrigerant detection sensor 41 without using the second refrigerant detection sensor 41. Therefore, deterioration of the second refrigerant detection sensor 41 can be suppressed.
The cover member 46 of the outside air blocking portion 45 may be made of a material that blocks light and heat. This makes it possible to block light or heat that may promote degradation of the second refrigerant detection sensor 41 without using the second refrigerant detection sensor 41. Therefore, deterioration of the second refrigerant detection sensor 41 can be suppressed.
Next, a control structure of the air conditioner 1 according to embodiment 1 will be described.
Fig. 3 is a block diagram showing a control structure according to the present embodiment.
As shown in fig. 3, the indoor unit 10 includes a control unit 50. The control unit 50 controls each device of the air conditioner 1. The control section 50 includes a processor and a memory. The control of the control section 50 is performed by a processor executing a program stored in a memory. The control section includes a timer 51. The first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 are connected to the control unit 50.
The control section 50 includes a communication section 52. The communication unit 52 can communicate with a remote control 53 operated by a user. That is, the control unit 50 controls the driving of the compressor 31, the outdoor fan 32, the expansion mechanism 33, the four-way valve 34, the indoor fan 15 of the indoor unit 10, and the up-down wind direction plate 19 of the outdoor unit 30 based on the set temperature inputted through the remote controller 53 by the user's operation on the remote controller 53.
The control unit 50 controls the refrigerant shut valve 20 to perform a closing operation when the first refrigerant detection sensor 40 or the second refrigerant detection sensor 41 detects a refrigerant leak.
The control unit 50 counts the driving time of the first refrigerant detection sensor 40 by 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 5 years, which is the lifetime of the first refrigerant detection sensor 40. The control unit 50 releases the cover member 46 by the drive release unit 48 when the driving time of the first refrigerant detection sensor 40 reaches 5 years. Thereby, the second refrigerant detection sensor 41 can be made to detect the refrigerant leakage.
Further, the control portion 50 determines degradation of the first refrigerant detection sensor 40 based on the output of the first refrigerant detection sensor 40.
Fig. 4 is a diagram showing an example of degradation determination (degradation determination) of the first refrigerant detection sensor 40. As shown in fig. 4, with respect to the first refrigerant detection sensor 40, the sensor output is 0 at the time of shipment, and rises from the 0 value in proportion to the concentration of the refrigerant. In this case, the control unit 50 reports the leakage of the refrigerant when the concentration of the leaked refrigerant outputted from the sensor is between 1/100LFL (LFL: minimum flammable concentration) and 1/4 LFL.
On the other hand, when the first refrigerant detection sensor 40 is degraded, the sensor output tends to be increased as compared with when shipped. Therefore, the control unit 50 performs degradation determination using a degradation determination threshold value for degradation determination set for the sensor output of 0 value, specifically, for example, the control unit 50 determines that the sensor is degraded when the sensor output at 0 value exceeds the degradation determination threshold value and the state in which the sensor output exceeds the degradation determination threshold value continues for a predetermined time or longer, for example, 24 hours or longer. In this way, when the state in which the sensor output exceeds the degradation determination threshold value continues for a predetermined time or longer (for example, 24 hours or longer), the sensor degradation is determined for the following reason. That is, this is because the sensor output varies somewhat due to the temperature cycle of 1 day, but if the state in which the sensor output exceeds the degradation determination threshold value continues for 24 hours, for example, it is considered that the influence of the temperature cycle of 1 day is not exerted.
Here, the degradation determination threshold value for degradation determination of the sensor is set to a value lower than the sensor output for reporting of the refrigerant leakage. By setting in this way, it is possible to suppress error reporting when the sensor is degraded and the sensor output is increased.
(1-2. Action)
Next, the operation of the air conditioner 1 according to embodiment 1 will be described.
In the present embodiment, when the air conditioner 1 is provided, the first refrigerant detection sensor 40 is operated (activated), and the control unit 50 determines whether or not the refrigerant leaks from the output value of the first refrigerant detection sensor 40. The control unit 50 counts the driving time from the time of setting the first refrigerant detection sensor 40 by the timer 51.
The control unit 50 performs cooling and heating operations based on the indoor temperature set by the remote controller 53 by driving the compressor 31, the outdoor fan 32, the expansion mechanism 33, the four-way valve 34, and the indoor fan 15, respectively.
The first refrigerant detection sensor 40 monitors the refrigerant leakage of the indoor unit 10, and when the first refrigerant detection sensor 40 detects the refrigerant leakage, the control unit 50 controls the refrigerant shut valve 20 to perform the closing operation.
While the first refrigerant detection sensor 40 monitors the refrigerant leakage of the indoor unit 10, the second refrigerant detection sensor 41 stops operating. At this time, the contact between the second refrigerant detection sensor 41 and the outside air is blocked by the outside air blocking portion 45, so that the aged deterioration of the second refrigerant detection sensor 41 when the operation of the second refrigerant detection sensor 41 is stopped can be suppressed.
When the timer 51 of the control unit 50 determines that the driving time of the first refrigerant detection sensor 40 has reached 5 years, the control unit 50 drives the release unit 48 of the second refrigerant detection sensor 41 to release the cover member 46, and can perform refrigerant leak detection by the second refrigerant detection sensor 41.
In addition, the control portion 50 determines degradation of the first refrigerant detection sensor 40 based on the output of the first refrigerant detection sensor 40. The control unit 50 sets a degradation determination threshold value for the sensor output of 0 value in advance. When the sensor output of the value 0 exceeds the degradation determination threshold value and the state in which the sensor output exceeds the degradation determination threshold value continues for a predetermined time or longer (for example, 24 hours or longer), the control unit 50 determines that the first refrigerant detection sensor 40 is degraded. When it is determined that the first refrigerant detection sensor 40 is degraded, the control unit 50 releases the cover member 46 of the second refrigerant detection sensor 41 by driving the release unit 48, thereby enabling refrigerant leak detection by the second refrigerant detection sensor 41.
The switching from the first refrigerant detection sensor 40 to the second refrigerant detection sensor 41 based on the count value of the accumulated driving time of the timer 51 of the first refrigerant detection sensor 40, and the switching from the first refrigerant detection sensor 40 to the second refrigerant detection sensor 41 based on the degradation judgment of the first refrigerant detection sensor 40 are performed with priority over the earlier switching.
That is, if the first refrigerant detection sensor 40 is determined to be degraded by the degradation determination before the count value of the driving time of the timer 51 passes 5 years, the switching from the first refrigerant detection sensor 40 to the second refrigerant detection sensor 41 is performed based on the degradation determination.
When the count value of the cumulative driving time of the timer 51 reaches a predetermined value or the first refrigerant detection sensor 40 is determined to be degraded by the degradation determination and the second refrigerant detection sensor 41 is switched, the control unit 50 may send a notification of the information that the driving of the first refrigerant detection sensor 40 is stopped and the second refrigerant detection sensor 41 is switched to the remote controller 53, the maintenance management company, or the like, and report the notification.
The control unit 50 may determine that the second refrigerant detection sensor 41 is degraded after the switching from the first refrigerant detection sensor 40 to the second refrigerant detection sensor 41 is completed.
At this time, when it is determined that both the first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 are deteriorated, the control unit 50 controls the refrigerant shut valve 20 to perform the closing operation so that the air conditioner 1 cannot be used because the air conditioner 1 cannot be continuously used. Thereby, the safety against the leakage of the refrigerant can be improved.
As described above, in the air conditioner 1 according to the present embodiment, the indoor heat exchanger 14 of the indoor unit 10 and the outdoor heat exchanger, the compressor, and the expansion device of the outdoor unit 30 are connected via the refrigerant pipe 21, and a flammable refrigerant is used as the refrigerant. The air conditioning apparatus 1 further includes a first refrigerant detection sensor 40 and a second refrigerant detection sensor that detect leakage of refrigerant. The second refrigerant detection sensor is provided with an outside air blocking portion 45 that blocks the sensor portion 42a of the second refrigerant detection sensor 41 from outside air, and a release portion 48 that releases the blocking of outside air by the outside air blocking portion 45.
In this way, by blocking outside air by the outside air blocking portion 45 while the first refrigerant detection sensor 40 is operated, aged deterioration of the second refrigerant detection sensor 41 can be suppressed. Therefore, when the second refrigerant detection sensor 41 is operated, erroneous detection due to aged deterioration can be suppressed. Therefore, the refrigerant leakage can be appropriately detected, and the safety against the refrigerant leakage can be improved.
The first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 may be provided at the same position. In this case, when switching from the first refrigerant detection sensor 40 to the detection of the refrigerant leakage by the second refrigerant detection sensor 41, the second refrigerant detection sensor 41 can be used to detect the refrigerant leakage under the same conditions as the first refrigerant detection sensor 40, and therefore, the occurrence of detection errors due to differences in installation places can be suppressed.
In the present embodiment, the first refrigerant detection sensor 40 is provided near a connection point of the refrigerant pipe 21 connecting the indoor unit 10 and the outdoor unit 30. The second refrigerant detection sensor 41 is provided near the bent pipe position of the refrigerant pipe 21 of the indoor heat exchanger 14. Thus, the leakage of the refrigerant due to the initial use of the indoor unit 10 can be appropriately detected by the first refrigerant detection sensor 40. Further, the second refrigerant detection processor 41 can appropriately detect leakage of the refrigerant due to aged deterioration of the refrigerant pipe 21.
In the present embodiment, the control unit 50 is included, and the sensor outputs of the first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 are input to the control unit 50. When it is determined that the first refrigerant detection sensor exceeds the degradation determination threshold value for a predetermined time or longer (for example, 24 hours or longer), the control unit 50 operates the release unit 48 to remove the outside air blocking unit 45, and switches to monitoring the refrigerant leakage using the second refrigerant detection sensor. The threshold for degradation determination is set to a value lower than the sensor output at which the first refrigerant detection sensor 40 detects and reports a refrigerant leak.
This enables the degradation determination of the first refrigerant detection sensor 40. In addition, erroneous detection of refrigerant leakage by the degraded first refrigerant detection sensor 40 can be avoided, and erroneous detection due to aged degradation of the first refrigerant detection sensor 40 can be suppressed. Therefore, the safety against refrigerant leakage can be improved.
In the present embodiment, the 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 elapsed the predetermined driving time, the release unit 48 is operated to remove the outside air blocking unit 45, and the operation is switched to monitoring the refrigerant leakage by using the second refrigerant detection sensor.
This can suppress erroneous detection by the first refrigerant detection sensor 40 having reached the service life. Therefore, the safety against refrigerant leakage can be improved.
In the present embodiment, when it is determined that both the first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 are degraded, the control unit 50 performs control so that the refrigerant shut valve 20 provided in the refrigerant pipe 21 connected to the indoor unit 10 is closed.
Thereby, the air conditioner 1 cannot be used, and the safety against refrigerant leakage can be improved.
(other embodiments)
As described above, embodiment 1 is described as an example of the technology described in the present application. However, the technique of the present invention is not limited to this, and can be applied to embodiments in which changes, substitutions, additions, omissions, and the like are made. In addition, the components described in embodiment 1 may be combined to form a new embodiment.
For example, the first refrigerant detection sensor 40 and the second refrigerant detection sensor 41 are generally configured by inserting pins of the sensor circuit board 42 into a connector provided on the control circuit board and connecting the connectors.
Therefore, an insulating film or the like may be interposed at a connection portion between the sensor circuit board 42 of the second refrigerant detection sensor 41 and the control circuit board, so that the sensor circuit board 42 may be in an insulated state. This makes it possible to isolate the outside air from the outside air by the outside air isolation unit 45 without conducting electricity to the sensor circuit board 42. Therefore, the second refrigerant detection sensor 41 can be kept in a substantially factory state.
In such a configuration, the removal of the insulating film may be notified when the lifetime of the first refrigerant detection sensor 40 has come or when it is determined that the first refrigerant detection sensor has deteriorated over time.
Industrial applicability
As described above, the air conditioner according to the present invention can suppress deterioration of performance due to aged deterioration of the refrigerant detection sensor and improve safety against refrigerant leakage, and therefore can be applied to various air conditioners.
Description of the reference numerals
1 air conditioner
10. Indoor machine
11. Shell body
12. Suction port
13. Blowing-out port
14. Indoor heat exchanger
15. Indoor fan
16. Filter device
17. Cleaning driving roller
18. Left-right wind direction plate
19. Up-down wind direction plate
20. Refrigerant isolating valve
21. Refrigerant piping
30. Outdoor unit
31. Compressor with a compressor body having a rotor with a rotor shaft
32. Outdoor fan
33 expansion mechanism (throttling device)
34. Four-way valve
40. First refrigerant detection sensor
41. Second refrigerant detection sensor
42. Sensor circuit board
42a sensor section
43. Sensor box
44. An opening
45. Outside air blocking part
46. Cover member
47. Elastic component
48. Releasing part
50. Control unit
51. Time-piece
52. Communication unit
53. And a remote controller.
Claims (8)
1. An air conditioning apparatus, characterized in that:
comprises an indoor heat exchanger of an indoor unit, an outdoor heat exchanger of an outdoor unit, a compressor and a throttling device,
the indoor heat exchanger, the outdoor heat exchanger, the compressor, and the throttle device are connected via refrigerant piping,
as the refrigerant, a flammable refrigerant is used,
the air conditioning device includes: a first refrigerant detection sensor and a second refrigerant detection sensor each having a sensor portion for detecting leakage of refrigerant,
the second refrigerant detection sensor has: an outside air blocking unit that blocks the sensor unit of the second refrigerant detection sensor from outside air; and a release unit for releasing the external air blocking unit from blocking the external air.
2. An air conditioning apparatus as set forth in claim 1, wherein:
the first refrigerant detection sensor and the second refrigerant detection sensor are disposed at the same position.
3. An air conditioning apparatus as set forth in claim 1, wherein:
the first refrigerant detection sensor is disposed in the vicinity of a connection point between the refrigerant pipe connecting the indoor unit and the outdoor unit and the indoor unit,
the second refrigerant detection sensor is disposed in the indoor heat exchanger in the vicinity of a bent pipe position of the refrigerant pipe.
4. An air conditioning apparatus according to any one of claims 1 to 3, wherein:
further comprising a control portion to which sensor outputs of the first refrigerant detection sensor and the second refrigerant detection sensor are input,
when it is determined that the output of the first refrigerant detection sensor exceeds a degradation determination threshold value for a predetermined time or longer, the control unit operates the release unit to remove the outside air blocking unit, switches to detection of refrigerant leakage using the second refrigerant detection sensor,
the threshold value for degradation determination is set to a value lower than the sensor output at which the first refrigerant detection sensor detects and reports the leakage of refrigerant.
5. The air conditioning apparatus of claim 4, wherein:
the control part comprises a timer which is provided with a timer,
the control unit counts the driving time of the first refrigerant detection sensor by the timer, and when it is determined that the driving time of the first refrigerant detection sensor has elapsed for a predetermined driving time, the control unit operates the release unit to remove the outside air blocking unit, and switches to detecting refrigerant leakage by using the second refrigerant detection sensor.
6. The air conditioning apparatus according to any one of claims 1 to 5, wherein:
a moisture-proof material is disposed inside the outside air blocking portion.
7. The air conditioning apparatus according to any one of claims 1 to 6, wherein:
the outside air blocking portion is made of a material that blocks light and heat.
8. The air conditioning apparatus according to any one of claims 1 to 7, wherein:
further comprising a refrigerant shut-off valve provided in the refrigerant piping connected to the indoor unit,
the control unit controls the refrigerant shut valve to perform a closing operation when it is determined that both the first refrigerant detection sensor and the second refrigerant detection sensor are degraded.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021135056A JP2023029008A (en) | 2021-08-20 | 2021-08-20 | air conditioner |
| JP2021-135056 | 2021-08-20 | ||
| PCT/JP2022/027250 WO2023021882A1 (en) | 2021-08-20 | 2022-07-11 | Air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117795263A true CN117795263A (en) | 2024-03-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280054460.5A Pending CN117795263A (en) | 2021-08-20 | 2022-07-11 | Air conditioner |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2023029008A (en) |
| CN (1) | CN117795263A (en) |
| WO (1) | WO2023021882A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014224612A (en) | 2011-09-16 | 2014-12-04 | パナソニック株式会社 | Air conditioner |
| JP6668879B2 (en) * | 2016-03-29 | 2020-03-18 | 株式会社富士通ゼネラル | Air conditioner |
| JP6819344B2 (en) * | 2017-02-15 | 2021-01-27 | 三菱電機株式会社 | Environmental monitoring device |
| JP6911441B2 (en) * | 2017-03-24 | 2021-07-28 | 三菱電機株式会社 | Environmental monitoring device |
-
2021
- 2021-08-20 JP JP2021135056A patent/JP2023029008A/en active Pending
-
2022
- 2022-07-11 WO PCT/JP2022/027250 patent/WO2023021882A1/en active Application Filing
- 2022-07-11 CN CN202280054460.5A patent/CN117795263A/en active Pending
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| Publication number | Publication date |
|---|---|
| WO2023021882A1 (en) | 2023-02-23 |
| JP2023029008A (en) | 2023-03-03 |
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