JP5892199B2 - Air conditioning indoor unit - Google Patents

Air conditioning indoor unit Download PDF

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Publication number
JP5892199B2
JP5892199B2 JP2014132618A JP2014132618A JP5892199B2 JP 5892199 B2 JP5892199 B2 JP 5892199B2 JP 2014132618 A JP2014132618 A JP 2014132618A JP 2014132618 A JP2014132618 A JP 2014132618A JP 5892199 B2 JP5892199 B2 JP 5892199B2
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refrigerant
temperature sensor
temperature
air
heat exchanger
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JP2016011767A (en
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荒屋 享司
享司 荒屋
平良 繁治
繁治 平良
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ダイキン工業株式会社
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/89Arrangement or mounting of control or safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plant or systems

Description

  The present invention relates to an air conditioning indoor unit, and more particularly to an air conditioning indoor unit of an air conditioner capable of performing a cooling operation and a heating operation using a slightly flammable refrigerant such as R32 as a refrigerant.

  As a conventional air-conditioning indoor unit, there is one using a slightly flammable refrigerant such as R32 as a refrigerant as described in Patent Document 1 (Japanese Patent Laid-Open No. 2002-098393). Some air conditioning indoor units of this type include a gas detection sensor as one means for detecting leakage of a slightly flammable refrigerant from the refrigerant pipe to the outside.

  On the other hand, means for detecting leakage of a slightly flammable refrigerant without using an expensive sensor such as a gas detection sensor has been studied. For example, in the air conditioner described in Patent Document 2 (Japanese Patent Laid-Open No. 2005-257219), when the difference between the refrigerant temperature on the compressor discharge side and the refrigerant temperature in the outdoor heat exchanger becomes equal to or greater than a predetermined value, It is determined that there is a refrigerant leak.

  However, it is desirable that the refrigerant leak in the indoor unit installed in the living space is detected immediately after the occurrence, and the above refrigerant leak detection method takes time from the refrigerant leak occurrence in the indoor unit to the leak detection. An amount of refrigerant will be discharged into the living space.

  The subject of this invention is providing the air-conditioning indoor unit which can detect a refrigerant | coolant leak quickly and reliably by a cheaper means, without providing a gas detection sensor.

An air-conditioning indoor unit according to a first aspect of the present invention is an air-conditioning indoor unit that houses a fan, a heat exchanger, and a refrigerant pipe in a casing having an air outlet, and includes an ambient temperature sensor and a control unit. . The ambient temperature sensor is arranged at a different location in the casing and detects the ambient temperature. A control part determines the presence or absence of a refrigerant | coolant leakage based on each detection temperature of several atmospheric temperature sensor. Further, the control unit determines that there is a refrigerant leak when a predetermined time has elapsed in a state where at least one detected temperature of the plurality of ambient temperature sensors is lower than a predetermined value.

  In this air conditioning indoor unit, for example, when refrigerant leakage occurs during operation stop, it is considered that refrigerant heavier than air accumulates in the lower part of the casing, and the temperature decreases due to evaporation. Therefore, the control unit can determine whether or not the refrigerant is accumulated based on the detection values of the temperature sensors having different height positions. As a result, it is possible to determine the presence or absence of refrigerant leakage without using an expensive gas detection sensor.

An air-conditioning indoor unit according to a second aspect of the present invention is an air-conditioning indoor unit that houses a fan, a heat exchanger, and a refrigerant pipe in a casing having an air outlet, and includes an ambient temperature sensor and a control unit. . The ambient temperature sensor is arranged at a different location in the casing and detects the ambient temperature. A control part determines the presence or absence of a refrigerant | coolant leakage based on each detection temperature of several atmospheric temperature sensor. Moreover, a control part calculates | requires the temperature difference between different positions based on the detection temperature of arbitrary two atmospheric temperature sensors among several atmospheric temperature sensors . Further, when the temperature difference is equal to or greater than a predetermined threshold, the control unit determines that the first state is that the leaked refrigerant is accumulated, and the temperature difference of the atmospheric temperature sensor on the lower height side remains with the temperature difference remaining below the predetermined threshold. When a predetermined time elapses in a state where the detected temperature is lower than a predetermined value, it is determined that the leaked refrigerant is accumulated to a position higher than the first state.

  In this air conditioning indoor unit, the difference between the detection values of the temperature sensors adjacent in the height direction is stable during stoppage or normal operation. Therefore, when there is a refrigerant leak, the detection value of the temperature sensor close to the leakage point is rapidly reduced, so that the difference between the detection values of the temperature sensor and the temperature sensor adjacent to the top and bottom changes significantly. Therefore, the control unit can determine that the refrigerant has leaked when the difference between the detection values exceeds a preset threshold value. As a result, it is possible to determine the presence or absence of refrigerant leakage without using an expensive gas detection sensor.

An air conditioning indoor unit according to a third aspect of the present invention is an air conditioning indoor unit that houses a fan, a heat exchanger, and a refrigerant pipe in a casing having a blower outlet, and includes an ambient temperature sensor and a control unit. . The ambient temperature sensor is arranged at a different location in the casing and detects the ambient temperature. A control part determines the presence or absence of a refrigerant | coolant leakage based on each detection temperature of several atmospheric temperature sensor. One atmosphere temperature sensor is disposed in the vicinity of the air outlet and detects the temperature of the air blown from the air outlet. Moreover, a control part determines with there being refrigerant | coolant leakage, when the difference of the temperature of a heat exchanger and the temperature of blowing air is larger than a predetermined threshold value. Further, the control unit changes the predetermined threshold depending on whether the operation mode is a heating operation or a cooling operation.

  In this air-conditioning indoor unit, when there is a refrigerant leak during operation and the refrigerant is drawn into a blow-off passage extending from the fan to the blow-out port and evaporates, the temperature of the blow-out air unintentionally decreases. Therefore, the control unit can determine the presence or absence of refrigerant leakage from the behavior of the temperature of the blown air.

In addition, if there is a refrigerant leak during operation and the refrigerant is drawn into the outlet passage from the fan to the outlet and evaporates, the difference between the temperature of the heat exchanger and the temperature of the outlet air is an unexpected value. Will be shown. Therefore, the control part can determine the presence or absence of refrigerant leakage from the difference between the temperature of the heat exchanger and the temperature of the blown air.

An air conditioning indoor unit according to a fourth aspect of the present invention is the air conditioning indoor unit according to any one of the first to third aspects, wherein a position adjacent to the refrigerant pipe or the refrigerant pipe among the plurality of ambient temperature sensors. Is disposed at a position adjacent to the brazed portion of the refrigerant pipe or the brazed portion .

  In this air conditioner indoor unit, refrigerant leakage is caused when stress due to piping drawing work at the time of installation or when the installation location is changed concentrates on the brazing portion and reaches a crack. Therefore, by arranging the temperature sensor at or near the brazed portion of the refrigerant pipe, it is possible to immediately detect a change in ambient temperature when refrigerant leakage occurs, so that refrigerant leakage can be detected early and reliably. can do.

  In the air conditioning indoor unit according to the first aspect of the present invention, for example, when there is a refrigerant leak during operation stop, it is considered that refrigerant heavier than air accumulates in the lower part of the casing and the temperature decreases due to evaporation. Therefore, the control unit can determine whether or not the refrigerant is accumulated based on the detection values of the temperature sensors having different height positions. As a result, it is possible to determine the presence or absence of refrigerant leakage without using an expensive gas detection sensor.

  In the air conditioning indoor unit according to the second aspect of the present invention, the difference between the detection values of the temperature sensors adjacent in the height direction is stable during stoppage or normal operation. Therefore, when there is a refrigerant leak, the detection value of the temperature sensor close to the leakage point is rapidly reduced, so that the difference between the detection values of the temperature sensor and the temperature sensor adjacent to the top and bottom changes significantly. Therefore, the control unit can determine that the refrigerant has leaked when the difference between the detection values exceeds a preset threshold value. As a result, it is possible to determine the presence or absence of refrigerant leakage without using an expensive gas detection sensor.

  In the air-conditioning indoor unit according to the third aspect of the present invention, when the refrigerant leaks during operation and the refrigerant is drawn into the outlet passage from the fan to the outlet and evaporates, the temperature of the outlet air is intended. It goes down. Therefore, the control unit can determine the presence or absence of refrigerant leakage from the behavior of the temperature of the blown air.

In addition, if there is a refrigerant leak during operation and the refrigerant is drawn into the outlet passage from the fan to the outlet and evaporates, the difference between the temperature of the heat exchanger and the temperature of the outlet air is an unexpected value. Will be shown. Therefore, the control part can determine the presence or absence of refrigerant leakage from the difference between the temperature of the heat exchanger and the temperature of the blown air.

In the air conditioning indoor unit according to the fourth aspect of the present invention, the refrigerant leakage is caused when the stress due to the pipe routing operation at the time of installation or when the installation location is changed concentrates on the brazed portion and leads to a crack. Therefore, by arranging the temperature sensor at or near the brazed portion of the refrigerant pipe, it is possible to immediately detect a change in ambient temperature when refrigerant leakage occurs, so that refrigerant leakage can be detected early and reliably. can do.

The refrigerant circuit figure of the air conditioning apparatus carrying the air-conditioning indoor unit which concerns on 1st Embodiment of this invention. The external view of the air-conditioning indoor unit which concerns on 1st Embodiment. Sectional drawing at the time of cut | disconnecting the air-conditioning indoor unit 100 of FIG. 2 by XX. The control block diagram of a control part. The control flow figure of leak detection control. The graph showing the change of the detected value of the 4th temperature sensor when the refrigerant has leaked. The graph showing the change by the noise of the detected value of a 4th temperature sensor when the refrigerant | coolant is not leaking. The graph showing the change of the detected value of the 4th temperature sensor in the 1st mode, and the 3rd temperature sensor. The graph showing the change of the detected value of the 4th temperature sensor in the 2nd mode, and the 3rd temperature sensor. The control flow figure of leak detection control concerning a modification. Sectional drawing of the air-conditioning indoor unit which concerns on 2nd Embodiment of this invention. The control flow figure of leak detection control concerning a 2nd embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

<First Embodiment>
(1) Configuration of Air Conditioner 120 FIG. 1 is a refrigerant circuit diagram of an air conditioner 120 equipped with the air conditioning indoor unit 100 according to the first embodiment of the present invention. In FIG. 1, the air conditioner 120 can perform a cooling operation and a heating operation by performing a vapor compression refrigeration cycle.

  The air conditioner 120 is configured by connecting the air-conditioning outdoor unit 110 and the air-conditioning indoor unit 100 via a liquid refrigerant communication pipe 26 and a gas refrigerant communication pipe 27. In this refrigerant circuit, R32, which is a kind of HFC refrigerant, is enclosed. The enclosed refrigerant is not limited to R32, and can be selected as appropriate.

(2) Configuration of Air Conditioning Outdoor Unit 110 The air conditioning outdoor unit 110 is installed outside the room. The air-conditioning outdoor unit 110 includes a compressor 33, a four-way switching valve 34, an outdoor heat exchanger 35, an expansion valve 36, a liquid side closing valve 37, a gas side closing valve 38, an outdoor fan 40, a room And an outer control unit 70.

(2-1) Compressor 33
The compressor 33 is a device that compresses the low-pressure refrigerant in the refrigeration cycle until the pressure becomes high. The compressor 33 has a suction pipe 331 connected to the suction side and a discharge pipe 332 connected to the discharge side. Note that an accumulator 29 is provided in the suction pipe 331.

(2-2) Four-way selector valve 34
The four-way switching valve 34 switches the direction of the refrigerant flow in the refrigerant circuit. During the cooling operation, the four-way switching valve 34 communicates the second port 34b and the third port 34c, and communicates the first port 34a and the fourth port 34d (the four-way switching valve 34 of FIG. 1). (See solid line).

  Further, during the heating operation, the four-way switching valve 34 communicates the second port 34b and the fourth port 34d and communicates the first port 34a and the third port 34c (four-way switching valve in FIG. 1). (See dashed line 34).

(2-3) Outdoor heat exchanger 35
The outdoor heat exchanger 35 functions as a refrigerant radiator that uses outdoor air as a cooling source during cooling operation, and functions as a refrigerant evaporator that uses outdoor air as a heating source during heating operation. The outdoor heat exchanger 35 has a liquid side connected to the liquid refrigerant pipe 335 and a gas side connected to the first gas refrigerant pipe 333.

(2-4) Expansion valve 36
The expansion valve 36 reduces the high-pressure refrigerant in the refrigeration cycle to the low pressure in the refrigeration cycle during the cooling operation. In addition, during the heating operation, the expansion valve 36 reduces the high-pressure refrigerant in the refrigeration cycle that has radiated heat in the indoor heat exchanger 13 to the low pressure in the refrigeration cycle.

(2-5) Liquid side closing valve 37 and gas side closing valve 38
The liquid side shutoff valve 37 and the gas side shutoff valve 38 are valves provided at connection ports with the liquid refrigerant communication pipe 26 and the gas refrigerant communication pipe 27. The liquid side closing valve 37 is provided at the end of the liquid refrigerant pipe 335, and the gas side closing valve 38 is provided at the end of the second gas refrigerant pipe 334.

(2-6) Outdoor fan 40
The outdoor fan 40 sucks outdoor air into the air-conditioning outdoor unit 110, exchanges heat with the refrigerant in the outdoor heat exchanger 35, and then discharges the air to the outside. A propeller fan or the like is used as the outdoor fan 40.

(2-7) Outdoor control unit 70
The outdoor side control part 70 controls operation | movement of each part which comprises the air-conditioning outdoor unit 110. FIG. The outdoor side control unit 70 can exchange control signals and the like with the indoor side control unit 60 of the air conditioning indoor unit 100 via the transmission line 50a.

(3) Configuration of Air Conditioning Indoor Unit 100 FIG. 2 is an external view of the air conditioning indoor unit 100 according to the first embodiment. In FIG. 2, an air conditioning indoor unit 100 is attached to an indoor wall surface or the like, and is connected to an air conditioning outdoor unit (not shown) installed outside via a refrigerant pipe (not shown).

  FIG. 3 is a cross-sectional view of the air conditioning indoor unit 100 illustrated in FIG. 2 taken along the line XX. In FIG. 3, the air conditioning indoor unit 100 includes a casing 11, an indoor heat exchanger 13, an indoor fan 15, a bottom frame 17, a filter 25, and an indoor side control unit 60.

(3-1) Casing 11
As shown in FIG. 2, the casing 11 has a box-like shape that is elongated in the lateral direction (W direction in FIG. 2). As shown in FIGS. 2 and 3, the casing 11 forms a three-dimensional space by the top plate 11a, the front plate 11b, and the back plate 11c, and the indoor heat exchanger 13, the indoor fan 15, the bottom frame 17, The filter 25 and the indoor side control part 60 are accommodated.

  The top plate 11 a constitutes the top surface of the casing 11. The front plate 11 b constitutes the front of the casing 11. The upper end of the front plate 11b is rotatably supported by a part of the top plate 11a, and can operate in a hinged manner.

  The back plate 11 c constitutes the back surface of the casing 11. The back plate 11c is attached to a mounting plate (not shown) installed on the wall surface of the room by screws or the like, so that the air conditioning indoor unit 100 is installed on the wall surface of the room.

  The top plate 11a of the casing 11 is provided with a top suction port 21 from the front side to the rear side of the top plate 11a. Indoor air in the vicinity of the top surface suction port 21 is taken into the casing 11 from the top surface suction port 21 by driving the indoor fan 15 and sent to the indoor heat exchanger 13.

  The lower surface of the casing 11 is constituted by the bottom portion 17a of the bottom frame 17, etc., and a lower surface suction port 22 and an air outlet 23 are formed on the lower surface. The lower surface suction port 22 is provided on the wall side of the air outlet 23 and is connected to the inside of the casing 11 by the suction flow path 16.

  From the lower surface suction port 22, indoor air in the vicinity of the lower surface suction port 22 is taken into the casing 11 by driving the indoor fan 15, and sent to the rear side of the indoor heat exchanger 13 through the suction channel 16. .

  The outlet 23 is provided on the front side of the air conditioning indoor unit 100 with respect to the lower surface inlet 22, and is connected to the inside of the casing 11 by the outlet channel 18. The room air sucked from the top surface suction port 21 and the lower surface suction port 22 is subjected to heat exchange in the indoor heat exchanger 13, and then blown out from the blower outlet 23 into the room through the blowout flow path 18.

  The suction flow path 16 is formed along the flow path forming wall 17 b of the bottom frame 17 from the lower surface suction port 22. The blowout flow path 18 is formed along the flow path forming wall 17 b of the bottom frame 17 from the blowout opening 23. That is, the suction flow channel 16 and the blow flow channel 18 are located adjacent to each other with the flow channel forming wall 17b of the bottom frame 17 interposed therebetween.

  A horizontal flap 23 a is attached to the casing 11 so as to be rotatable in the vicinity of the air outlet 23. The horizontal flap 23 a is rotated by a flap driving motor (not shown), and opens and closes the air outlet 23 according to the operating state of the air conditioning indoor unit 100.

(3-2) Indoor heat exchanger 13
The indoor heat exchanger 13 includes a plurality of fins and a plurality of heat transfer tubes. The indoor heat exchanger 13 functions as an evaporator or a condenser according to the operating state of the air conditioning indoor unit 100, and performs heat exchange between the refrigerant and the air passing through the indoor heat exchanger 13.

  As shown in FIG. 3, the indoor heat exchanger 13 has a substantially inverted V shape in which both ends are bent downward in a side view, and the indoor fan 15 is positioned below the indoor heat exchanger 13.

(3-3) Indoor fan 15
The indoor fan 15 is located inside the casing 11 and is a substantially cylindrical cross flow fan elongated in the W direction shown in FIG. When the indoor fan 15 is operated, indoor air is sucked in from the top surface suction port 21 and the bottom surface suction port 22, passes through the indoor heat exchanger 13, and then supplied to the room from the air outlet 23.

(3-4) Bottom frame 17
The bottom frame 17 includes a bottom portion 17a and a flow path forming wall 17b. The bottom portion 17a is an element constituting at least a part of the lower surface of the casing 11, and is a portion of the bottom frame 17 exposed to the outside of the air conditioning indoor unit 100.

  The flow path forming wall 17 b is a part of the bottom frame 17 that is located inside the casing 11. The flow path forming wall 17b extends from one end of the bottom portion 17a while curving so as to approach the indoor fan 15, and in the vicinity of the rear end of the indoor heat exchanger 13, the first branch wall 17ba and the second branch wall 17bb. It is divided into and.

  The first branch wall 17ba extends while curving so as to approach the indoor fan. The second branch wall 17bb extends away from the indoor fan 15 along the rear end surface of the indoor heat exchanger 13.

  A heat insulating material 170 is affixed to the second branch wall 17bb and the lower portion of the flow path forming wall 17b.

(3-5) Filter 25
The filter 25 is disposed between the top plate 11a of the casing 11 and the indoor heat exchanger 13, and is detachably mounted inside the casing 11. The filter 25 removes dust from the room air sucked from the top surface suction port 21 and prevents the surface of the indoor heat exchanger 13 from being contaminated by dust in the room air.

(3-6) Indoor control unit 60
The indoor side control unit 60 has a microcomputer as a command unit 61 and a determination unit 63 (see FIG. 4) and a memory as a storage unit 62 (see FIG. 4) in order to control the air conditioning indoor unit 100. Control signals and the like are exchanged with a remote controller (not shown), and control signals and the like are exchanged with the outdoor unit 3 via the transmission line 50a.

(3-7) Temperature sensors 51, 52, 53, 54
In the casing 11, four temperature sensors 51, 52, 53, 54 are arranged. The four temperature sensors 51, 52, 53, 54 are arranged in the order of the first temperature sensor 51, the second temperature sensor 52, the third temperature sensor 53, and the fourth temperature sensor 54 from above in the vertical direction. Yes.

  The four temperature sensors 51, 52, 53, and 54 are so-called ambient temperature sensors that detect the ambient temperature of the place where they are arranged, not the temperature of a specific member.

  For example, the first temperature sensor 51 is disposed between the top plate 11 a and the filter 25. The second temperature sensor 52 is disposed in the vicinity of the end of the indoor heat exchanger 13. The third temperature sensor 53 is disposed at a corner between the first branch wall 17ba and the second branch wall 17bb. The fourth temperature sensor is disposed in the vicinity of the bottom portion 17 a of the bottom frame 17.

  The reason why the second temperature sensor 52 is disposed in the vicinity of the end of the indoor heat exchanger 13 is that the heat transfer pipe that penetrates the fin of the indoor heat exchanger 13 is brazed with a U-shaped tube or a connecting pipe at the end. This is because the occurrence of cracks in the brazed portion due to poor brazing such as pinholes and stress concentration during piping routing is assumed.

  Therefore, although the first temperature sensor 51, the third temperature sensor 53, and the fourth temperature sensor 54 are also different in vertical position, it can be said that the position in the horizontal direction is preferably closer to the end of the indoor heat exchanger 13.

(4) Control unit 50
FIG. 4 is a control block diagram of the control unit 50. In FIG. 4, the control part 50 is comprised by the indoor side control part 60, the outdoor side control part 70, and the transmission line 50a which connects between both, and performs operation control of the air conditioning apparatus 120 whole.

  Based on various operation settings and detection values of various sensors, the control unit 50 rotates the compressor 33, the switching operation of the four-way switching valve 34, the opening of the expansion valve 36, the rotational speed of the outdoor fan motor 41, And the rotation speed of the indoor fan 15 can be controlled. The control unit 50 performs refrigerant leakage detection control described below.

(5) Refrigerant leakage detection control When there is a refrigerant leak in the casing 11, it is considered that a refrigerant heavier than air moves downward and accumulates, and the temperature decreases due to evaporation. For example, when the leaked refrigerant passes through the suction passage 16 and accumulates in the corner portion of the lower surface suction port 22 and evaporates, the detection value of the fourth temperature sensor 54 changes faster than the other temperature sensors.

  However, even if the fourth temperature sensor 54 detects an abrupt temperature drop, there may be a transient change due to other factors. Therefore, the temporal change in the temperature of the portion where the fourth temperature sensor 54 is installed is possible. In consideration of the above, it is necessary to determine whether or not the refrigerant is accumulated there. Therefore, a determination unit 63 (see FIG. 4) is provided in the indoor side control unit 60 of the control unit 50.

  Based on the detection value of the fourth temperature sensor 54, the determination unit 63 determines whether or not refrigerant has accumulated in the portion where the fourth temperature sensor 54 is installed. Hereinafter, the determination of refrigerant leakage will be described using the fourth temperature sensor 54 as an example.

  FIG. 5 is a control flow diagram of leakage detection control. In FIG. 5, the determination unit 63 determines whether or not the detection value T4 of the fourth temperature sensor 54 is smaller than the threshold value Ta in step S1, and proceeds to step S2 when T4 <Ta, and when T4 <Ta is not satisfied. Continues its decision.

  Next, the determination unit 63 sets a timer in step S2 and measures an elapsed time t after determining T4 <Ta.

  Next, the determination unit 63 determines whether or not the elapsed time t has reached the predetermined time ta in step S3. When the predetermined time ta has been reached, the process proceeds to step S4, and when the predetermined time ta has not been reached. Continues its decision.

  Next, the determination unit 63 determines whether or not the detected value T4 of the fourth temperature sensor 54 is smaller than Ta in step S4. If T4 <Ta, the process proceeds to step S5, and if T <Ta is not satisfied, step S5 is performed. Proceed to S7.

  Next, the determination part 63 determines with "the refrigerant | coolant has accumulated in the casing 11 lower part" in step S5. The basis for this determination will be described with reference to FIGS. 6A and 6B.

  FIG. 6A is a graph showing changes in the detection value of the fourth temperature sensor 54 when the refrigerant is leaking. FIG. 6B is a graph showing a change due to noise in the detection value of the fourth temperature sensor 54 when the refrigerant is not leaking.

  In FIG. 6A, when the refrigerant leaks into the casing 11 and begins to accumulate in the lower part, the refrigerant deprives the surrounding heat amount and evaporates as time passes. The reduced temperature is maintained until almost evaporated. How much the temperature of the lower portion of the casing 11 is lowered depends on the amount of the leaked refrigerant, but considering that the evaporation temperature at the atmospheric pressure of the R32 refrigerant is −51.91 ° C., whether or not the temperature can be lowered normally. It can be easily determined.

  Therefore, by setting the temperature sufficiently lower than the normal temperature of the casing 11 as the threshold value Ta, the detection value T4 of the fourth temperature sensor 54 is lower than Ta, and after a predetermined time ta has elapsed since T4 <Ta. When T4 <Ta is maintained, it can be determined that the refrigerant is accumulated in the lower portion of the casing 11. That is, it can be detected that the refrigerant is leaking.

  Therefore, the determination unit 63 issues an alarm notifying the occurrence of “refrigerant leakage” in step S6. The alarm may be an alarm sound or a message displayed on the remote control display.

  On the other hand, when the detection value of the fourth temperature sensor 54 is affected by noise, as shown in FIG. 6B, it is determined that the temperature of the lower portion of the casing 11 has decreased, and a timer is set. However, since the change in this case is transient, the detected value of the fourth temperature sensor 54 outputs the original temperature of the lower portion of the casing 11 until the predetermined time ta elapses.

  Therefore, when the determination unit 63 determines in step S4 that the detection value T4 of the fourth temperature sensor 54 is not smaller than Ta, the determination unit 63 proceeds to step S7 and determines that “no refrigerant has accumulated in the lower portion of the casing 11”. .

  In step S8, the timer setting is canceled and the process returns to step S1, and the refrigerant leakage detection control is continued.

  As described above, based on the detection value of the fourth temperature sensor 54, it can be determined whether or not the refrigerant has accumulated in the lower portion of the casing 11. As a result, it is possible to determine the presence or absence of refrigerant leakage without using an expensive gas detection sensor.

  In the above embodiment, the third temperature sensor 53, the second temperature sensor 52, and the first temperature sensor 51 are arranged in the vertical direction above the fourth temperature sensor 54. Even if the first temperature sensor 51, the second temperature sensor 52, the third temperature sensor 53, and the fourth temperature sensor 54 are not accumulated in the lower part of the casing 11 and evaporated at the leakage portion, one of the detected values of the first temperature sensor 51, the second temperature sensor 52, the third temperature sensor 53, When the state of 6A is shown, it can be determined that the refrigerant is leaking.

  For example, when the refrigerant leaks from the brazed portion of the heat transfer tube of the indoor heat exchanger 13 and accumulates at the corners of the first branch wall 17ba and the second branch wall 17bb and evaporates, the third temperature sensor 53 is not It changes faster than a temperature sensor. In addition, since the difference between the detection values of the temperature sensors is different from that at the time of stabilization, it can be estimated that the refrigerant has entered the casing 11.

(6) Features of the first embodiment (6-1)
In the air conditioning indoor unit 100, the detected value T4 of the fourth temperature sensor 54 is smaller than the threshold value Ta, and if T4 <Ta even after a predetermined time ta has elapsed since T4 <Ta, the refrigerant is in the casing 11. It is determined that it has accumulated at the bottom. Therefore, it is possible to determine the presence or absence of refrigerant leakage based on the detection value of the fourth temperature sensor 54 without using an expensive gas detection sensor.

(6-2)
A situation in which the refrigerant does not accumulate in the lower part of the casing 11 and evaporates at an intermediate height position, or a situation in which the refrigerant starts to evaporate before blowing out above the casing 11 and moving downward is assumed. However, since the fourth temperature sensor 54, the third temperature sensor 53, the second temperature sensor 52, and the first temperature sensor 51 are arranged in order from the bottom surface side of the casing 11, the first temperature sensor 51, When any one of the detection values of the second temperature sensor 52, the third temperature sensor 53, and the fourth temperature sensor 54 indicates the state of FIG. 6A, it can be determined that the refrigerant is leaking. Moreover, when the difference of the detection value of each temperature sensor has shown the value different from the time of stable, it can be estimated that the refrigerant | coolant leaked in the casing 11. FIG.

(7) Modification In the above embodiment, it is determined whether or not the refrigerant has accumulated in the lower part of the casing 11 based on the detection value of the fourth temperature sensor 54, but the detection value of the third temperature sensor 53 The determination accuracy can be further improved by comparing the two. For example, two modes are assumed as the mode indicated by the detection value of the third temperature sensor 53.

  FIG. 7A is a graph showing changes in detection values of the fourth temperature sensor 54 and the third temperature sensor 53 in the first mode. FIG. 7B is a graph showing changes in detection values of the fourth temperature sensor 54 and the third temperature sensor 53 in the second mode.

  7A, in the first mode, the leaked refrigerant accumulates in the lower portion of the casing 11, and the fourth temperature sensor 54 is in the atmosphere of the leaked refrigerant, but has not yet accumulated to the height position of the third temperature sensor 53. Occurs when. In the first mode, the detection value of the third temperature sensor 53 is stable, and the detection value of the fourth temperature sensor 54 changes greatly.

  In FIG. 7B, the second mode occurs when the leaked refrigerant remains at the height position of the third temperature sensor 53. The second mode is similarly changed although the detection values of the fourth temperature sensor 54 and the third temperature sensor 53 are different.

  Therefore, the determination unit 63 starts the control for the second mode when it is determined that the mode is not the first mode while first responding with the control for the first mode. In the case of the first mode, the difference ΔT between the detection values of the fourth temperature sensor 54 and the third temperature sensor 53 is monitored, and when ΔT becomes equal to or greater than a predetermined threshold value ΔTs, the refrigerant has accumulated in the lower part of the casing 11. judge.

  On the other hand, in the case of the second mode, the detected value T4 of the fourth temperature sensor 54 is lower than Ta, and T4 <Ta is maintained even after a predetermined time ta has elapsed since T4 <Ta. When it is, it is determined that the refrigerant has accumulated in the lower part of the casing 11. This will be described below with reference to a control flowchart.

(7-1) Refrigerant Leakage Detection Control FIG. 8 is a control flow diagram of leakage detection control according to a modification. In FIG. 8, the determination unit 63 acquires the detection value T4 of the fourth temperature sensor 54 in step S11, and proceeds to step S12.

  Next, in step S12, the determination unit 63 acquires the detection value T3 of the third temperature sensor 53, and proceeds to step S13.

  Next, the determination part 63 calculates | requires difference (DELTA) T (= T3-T4) of the detected value of the 4th temperature sensor 54 and the 3rd temperature sensor 53 in step S13, and progresses to step S14.

  Next, in step S14, the determination unit 63 determines whether or not ΔT is equal to or greater than the threshold value ΔTs. If ΔT ≧ ΔTs, the process proceeds to step S15, and if ΔT ≧ ΔTs, the process proceeds to step S24.

  Next, the determination unit 63 determines “is the first mode” in step S15, proceeds to step S29, and issues a refrigerant leakage warning to the user.

  When the determination unit 63 determines that ΔT ≧ ΔTs is not satisfied in step S14 and proceeds to step S24, it determines whether or not the detection value T4 of the fourth temperature sensor 54 is smaller than Ta in step S24. When T4 <Ta, the process proceeds to step S25, and when T4 <Ta, the process returns to step S11.

  Next, the determination unit 63 sets a timer in step S25, and measures an elapsed time t after determining T4 <Ta.

  Next, the determination unit 63 determines whether or not the elapsed time t has reached the predetermined time ta in step S26. When the predetermined time ta has been reached, the process proceeds to step S27, and when the predetermined time ta has not been reached. Continues its decision.

  Next, the determination unit 63 determines whether or not the detection value T4 of the fourth temperature sensor 54 is smaller than Ta in step S27. If T4 <Ta, the process proceeds to step S28, and if T4 <Ta, the determination unit 63 proceeds to step S28. Proceed to S37.

  Next, the determination unit 63 determines “is the second mode” in step S28, proceeds to step S29, and issues a refrigerant leakage warning to the user.

  On the other hand, when the determination unit 63 determines in step S27 that the detection value T4 of the fourth temperature sensor 54 is not smaller than Ta, the determination unit 63 proceeds to step S7 and determines that “no refrigerant has accumulated in the lower portion of the casing 11”. To do.

  In step S38, the timer setting is canceled and the process returns to step S11 to continue the refrigerant leakage detection control.

  As described above, based on the detection values of the fourth temperature sensor 54 and the third temperature sensor 53, it can be determined whether or not the refrigerant has accumulated in the lower portion of the casing 11. As a result, it is possible to determine the presence or absence of refrigerant leakage without using an expensive gas detection sensor.

Second Embodiment
FIG. 9 is a cross-sectional view of an air conditioning indoor unit according to the second embodiment of the present invention. In FIG. 9, the second embodiment is the first in that the fifth temperature sensor 55 is installed in the vicinity of the outlet 23, and the heat exchanger temperature sensor 73 is installed in the indoor heat exchanger 13. Unlike the embodiment, other configurations are the same as those of the first embodiment. Therefore, the operation and effect obtained by providing the fifth temperature sensor 55 and the heat exchanger temperature sensor 73 will be described.

  The fifth temperature sensor 55 detects the temperature of the air blown from the air outlet 23. The heat exchanger temperature sensor 73 detects the temperature of the indoor heat exchanger 13. In the air conditioner indoor unit 100, if there is a refrigerant leak during operation and the refrigerant is drawn into the blowout flow path 18 extending from the indoor fan 15 to the blowout port 23 and evaporates, the temperature of the indoor heat exchanger 13 and the blown air The difference from the temperature of will show an unexpected value. Therefore, the control part 50 can determine the presence or absence of refrigerant | coolant leakage from the difference of the temperature of the indoor heat exchanger 13 and the temperature of blowing air. This will be described below with reference to a control flowchart.

(1) Refrigerant Leakage Detection Control FIG. 10 is a control flow diagram of leakage detection control according to the second embodiment. In FIG. 10, the determination part 63 acquires detection value T5 of the 5th temperature sensor 55 by step S41, and progresses to step S42.

  Next, the determination part 63 acquires detection value Th3 of the heat exchanger temperature sensor 73 in step S42, and progresses to step S43.

  Next, the determination part 63 calculates | requires difference (DELTA) Tn (= Th3-T5) of the detected value of the 5th temperature sensor 55 and the heat exchanger temperature sensor 73 in step S43, and progresses to step S44.

  Next, in step S44, the determination unit 63 determines whether or not the operation mode is the heating operation. When the operation mode is the heating operation, the process proceeds to step S45, and when the operation mode is other than the heating operation (cooling operation), the step is performed. Proceed to S46.

  Next, the determination unit 63 determines whether or not ΔTn is equal to or greater than the threshold value ΔTsh in step S45.

  During the heating operation, the temperature of the air that has passed through the indoor heat exchanger 13 drops to a certain extent before it reaches the outlet 23 via the outlet flow path 18, so that the temperature of the outlet air is usually higher than that of the indoor heat exchanger 13. It is low.

  When the refrigerant leaks into the air sucked into the indoor fan 15, the leaked refrigerant mixed with the air passes through the outlet passage 18 and reaches the outlet 23. Since it evaporates while absorbing heat from the air, the temperature of the blown air becomes even lower than normal.

  Therefore, when the refrigerant leaks and the leaked refrigerant is drawn into the air sucked into the indoor fan 15, the difference ΔTn (= Th3-T5) between the detection values of the fifth temperature sensor 55 and the heat exchanger temperature sensor 73 is It becomes larger than usual.

  For example, the temperature of the blown air when the temperature of the indoor heat exchanger 13 during the heating operation is 50 ° C. is 40 ° C. At this time, ΔTn = Th3−T5 = 50−40 = 10.

  On the other hand, assuming that the refrigerant leaks and the leaked refrigerant is drawn into the air sucked into the indoor fan 15, the temperature of the blown air is lower than the temperature of the indoor heat exchanger 13, for example, 0 ° C. If so, the difference ΔTn = 50−0 = 50.

  Therefore, for example, if ΔTsh = 20 ° C. is set, it can be estimated that “the refrigerant is leaking” when ΔTn ≧ ΔTsh = 20 ° C.

  Therefore, the determination unit 63 proceeds to step S47 when determining that ΔTn ≧ ΔTsh, and returns to step S41 when determining that ΔTn ≧ ΔTsh is not satisfied.

  On the other hand, in step S46, the determination unit 63 determines whether ΔTn is equal to or greater than the threshold value ΔTsc.

  During the cooling operation, the temperature of the air that has passed through the indoor heat exchanger 13 rises to some extent before it reaches the outlet 23 via the outlet channel 18, so that the temperature of the outlet air is usually higher than that of the indoor heat exchanger 13. It is high.

  However, when the refrigerant leaks and the leaked refrigerant is drawn into the air sucked into the indoor fan 15, the surrounding air passes through the blowout flow path 18 and reaches the outlet 23. Therefore, the temperature of the blown air becomes lower than that of the indoor heat exchanger 13.

  Therefore, when the refrigerant leaks and the leaked refrigerant is drawn into the air sucked into the indoor fan 15, the difference ΔTn (= Th3-T5) between the detection values of the fifth temperature sensor 55 and the heat exchanger temperature sensor 73 is It is reversed from normal.

  For example, the blowing temperature when the temperature of the indoor heat exchanger 13 during the cooling operation is 5 ° C. is 15 ° C. At this time, the difference ΔTn = Th3−T5 = 5−15 = −10 between the detection values of the fifth temperature sensor 55 and the heat exchanger temperature sensor 73.

  On the other hand, assuming that the refrigerant leaks and the leaked refrigerant is drawn into the air sucked into the indoor fan 15, the temperature of the blown air is lower than the temperature of the indoor heat exchanger 13, for example, 0 ° C. If it becomes, it is the difference (DELTA) Tn = Th3-T5 = 5-0 = 5 of the detected value of the 5th temperature sensor 55 and the heat exchanger temperature sensor 73. FIG.

  As described above, the difference ΔTn normally indicates a negative value, but if the refrigerant leaks and the leaked refrigerant is drawn into the air sucked into the indoor fan 15, the difference ΔTn is reversed from the normal value and indicates a positive value. .

  Therefore, for example, if ΔTsc = 0 ° C. is set, it can be estimated that “refrigerant is leaking” when ΔTn ≧ ΔTsc = 0 ° C.

  Therefore, the determination unit 63 proceeds to step S47 when determining that ΔTn ≧ ΔTsc, and returns to step S41 when determining that ΔTn ≧ ΔTsc is not satisfied.

  Next, the determination unit 63 determines that “refrigerant is leaking” in step S47, proceeds to step S48, and issues a refrigerant leak warning to the user.

(2) Features of the second embodiment In the air conditioning indoor unit 100, if there is a refrigerant leak during operation and the refrigerant is drawn into the blow-off flow path 18 extending from the indoor fan 15 to the outlet, and evaporated, The difference ΔTn between the temperature of the exchanger 13 (detection value Th3) and the temperature of the blown air (detection value T5) will be an unexpected value. Therefore, when the difference ΔTn between the temperature of the indoor heat exchanger 13 (detection value Th3) and the temperature of the blown air (detection value T5) exceeds a preset threshold, the control unit 50 leaks refrigerant. Can be determined.

  The present invention is widely applicable to a refrigeration apparatus that can perform a cooling operation and a heating operation using a slightly flammable refrigerant or a flammable refrigerant.

11 Casing 13 Heat exchanger 15 Indoor fan 23 Air outlet 51 First temperature sensor (atmosphere temperature sensor)
52 Second temperature sensor (atmosphere temperature sensor)
53 Third temperature sensor (atmosphere temperature sensor)
54 Fourth temperature sensor (atmosphere temperature sensor)
55 Fifth temperature sensor (atmosphere temperature sensor)
60 Indoor control unit (control unit)
73 Heat Exchanger Temperature Sensor 100 Air Conditioning Indoor Unit

JP 2002-098393 A JP 2005-257219 A

Claims (4)

  1. An air conditioning indoor unit that houses a fan (15), a heat exchanger (13), and a refrigerant pipe in a casing (11) having an air outlet (23),
    A plurality of ambient temperature sensors (51, 52, 53, 54, 55) arranged at different positions in the casing (11) to detect the ambient temperature;
    A control unit (60) for determining the presence or absence of refrigerant leakage based on the detected temperature of each of the plurality of ambient temperature sensors (51, 52, 53, 54, 55);
    Equipped with a,
    When the controller (60) passes a predetermined time in a state where at least one detected temperature of the plurality of ambient temperature sensors (51, 52, 53, 54, 55) is lower than a predetermined value, the refrigerant leaks. Judge that there is,
    Air conditioning indoor unit (100).
  2. An air conditioning indoor unit that houses a fan (15), a heat exchanger (13), and a refrigerant pipe in a casing (11) having an air outlet (23),
    A plurality of ambient temperature sensors (51, 52, 53, 54, 55) arranged at different positions in the casing (11) to detect the ambient temperature;
    A control unit (60) for determining the presence or absence of refrigerant leakage based on the detected temperature of each of the plurality of ambient temperature sensors (51, 52, 53, 54, 55);
    With
    The controller (60) obtains a temperature difference between different positions based on the detected temperatures of any two ambient temperature sensors among the plurality of ambient temperature sensors (51, 52, 53, 54, 55) ,
    Furthermore, the control unit (60)
    When the temperature difference is equal to or greater than a predetermined threshold, it is determined that the first refrigerant is accumulated in the leaked refrigerant,
    When a predetermined time elapses in a state where the detected temperature of the ambient temperature sensor on the lower height position is lower than a predetermined value while the temperature difference is less than the predetermined threshold, the position is higher than the first state. It is determined that the second state in which leaked refrigerant is accumulated,
    Air conditioning indoor unit (100).
  3. An air conditioning indoor unit that houses a fan (15), a heat exchanger (13), and a refrigerant pipe in a casing (11) having an air outlet (23),
    A plurality of ambient temperature sensors (51, 52, 53, 54, 55) arranged at different positions in the casing (11) to detect the ambient temperature;
    A control unit (60) for determining the presence or absence of refrigerant leakage based on the detected temperature of each of the plurality of ambient temperature sensors (51, 52, 53, 54, 55);
    A heat exchanger temperature sensor (73) for detecting the temperature of the heat exchanger (13);
    With
    One said atmospheric temperature sensor (55) is arrange | positioned at the said blower outlet (23), and detects the temperature of the blowing air from the said blower outlet (23) ,
    The controller (60) determines that there is refrigerant leakage when the difference between the temperature of the heat exchanger (13) and the temperature of the blown air is greater than a predetermined threshold,
    Further, the control unit (60) changes the predetermined threshold depending on whether the operation mode is a heating operation or a cooling operation.
    Air conditioning indoor unit (100).
  4. Which is arranged at a position adjacent to the refrigerant pipe or the refrigerant pipe of the plurality of the ambient temperature sensor (51, 52, 53, 54) is adjacent to the brazed portion or the brazed portion of the refrigerant pipe Placed in position ,
    The air conditioning indoor unit (100) according to any one of claims 1 to 3 .
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CN106016579B (en) * 2016-05-10 2019-01-22 广东美的制冷设备有限公司 Air-conditioning system and the Discrete control method and apparatus for preventing secondary refrigerant leakage
US20190264965A1 (en) 2016-11-16 2019-08-29 Mitsubishi Electric Corporation Air-conditioning apparatus and refrigerant leakage detection method
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JPS5276757A (en) * 1975-12-23 1977-06-28 Saginomiya Seisakusho Inc Refrigerant leakage detector for refrigertion or cooling system using refrigerant
JPH07234045A (en) * 1994-02-24 1995-09-05 Matsushita Electric Ind Co Ltd Air conditioner
JPH11142004A (en) * 1997-11-05 1999-05-28 Daikin Ind Ltd Refrigerating device
JP3615039B2 (en) * 1997-12-05 2005-01-26 松下電器産業株式会社 Air conditioner
JP2000088327A (en) * 1998-09-10 2000-03-31 Tokyo Gas Co Ltd Indoor machine for air conditioning and control method of outlet air temperature thereof
JP2010276258A (en) * 2009-05-28 2010-12-09 Jfe Steel Corp Failure detection method within heat insulating tank
JP5818849B2 (en) * 2013-08-26 2015-11-18 三菱電機株式会社 Air conditioner and refrigerant leakage detection method
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