JP2016125694A - Air conditioner indoor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner indoor unit capable of accurately determining whether refrigerant leak has occurred.SOLUTION: A floor-standing indoor unit which is provided with refrigerant pipes 27, 28; a heat exchanger 16 implementing heat exchange between refrigerant flowing in the pipes 27, 28 and air; and an indoor fan 20 which generates an air flow passing through the heat exchanger 16, the refrigerant pipes 27, 28 being connected to communication pipes 25, 26 provided from outdoors via connection sections 31, 32, respectively, comprises: temperature sensors 33 disposed near the connection sections 31, 32, respectively; and a determination unit 42 that determines whether refrigerant leaks from the connection sections 31, 32 on the basis of detection results of the temperature sensors 33 when driving of the indoor fan 20 is stopped.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an indoor unit of an air conditioner.

  In recent years, the adoption of R32 refrigerant having a low global warming potential is progressing in air conditioners that cool and heat indoors using a vapor compression refrigeration cycle. However, since R32 refrigerant has a slight flammability (slight flammability), it is recommended to determine whether there is leakage from the refrigerant circuit. In particular, in the case of a floor-standing indoor unit, if a refrigerant having a specific gravity greater than that of air leaks, it may stay near the floor surface and reach a flammable concentration. Therefore, it is important to determine whether there is a leak.

  The following Patent Document 1 discloses a refrigerator provided with means for determining whether or not a flammable refrigerant has leaked. This technology includes a refrigerant condensing temperature detecting means and an outside air temperature detecting means, and judges an abnormality of the refrigerant circuit from the difference between the condensing temperature detected by these and the outside air temperature, and judges refrigerant leakage. is there.

JP 2005-140409 A

Since the technique described in Patent Document 1 indirectly detects the leakage of the refrigerant from the refrigerant condensing temperature and the outside air temperature, it is difficult to improve the determination accuracy of the leakage.
An object of this invention is to provide the indoor unit of the air conditioning apparatus which can improve the determination precision of the presence or absence of refrigerant | coolant leakage.

(1) The present invention includes a refrigerant pipe, a heat exchanger that exchanges heat between the refrigerant flowing through the refrigerant pipe and air, and an indoor fan that generates an air flow through the heat exchanger, The refrigerant pipe is a floor-standing indoor unit having a connection portion connected to a communication pipe arranged from the outside,
A temperature sensor disposed in the vicinity of the connecting portion;
And a determination unit that determines whether or not refrigerant leaks from the connection unit based on a detection result of the temperature sensor when driving of the indoor fan is stopped.

According to this configuration, the temperature of the refrigerant leaking from the connection portion can be directly detected by detecting the temperature in the vicinity of the connection portion of the refrigerant pipe by the temperature sensor. can do.
Further, when the indoor fan is driven, the air near the floor surface diffuses, and the leaked refrigerant is less likely to stay, and the possibility of reaching a flammable concentration is reduced. In the above configuration, it is possible to determine the presence or absence of refrigerant leakage in a situation where the refrigerant tends to stay by stopping the driving of the indoor fan.

(2) It is preferable that the said determination part determines the presence or absence of refrigerant | coolant leakage, when the drive of the said indoor fan is stopped other than during reverse cycle defrost driving | operation.
During the defrost operation by the reverse cycle, the low-temperature refrigerant flows through the indoor unit, and the temperature around the connection portion is also low. Therefore, it is difficult to determine whether or not the temperature decrease is due to refrigerant leakage. Therefore, by excluding this defrost operation period from the refrigerant leakage determination condition, the refrigerant leakage determination accuracy can be increased.

(3) It is preferable that the determination unit determines that the refrigerant has leaked when the detection value of the temperature sensor continues for a predetermined time and satisfies the leakage condition.
With such a configuration, it is possible to prevent erroneous determination as refrigerant leakage even when the leakage condition is instantaneously satisfied due to some disturbance.

(4) The said determination part may determine the presence or absence of a refrigerant | coolant leakage, when the rotation speed of the said indoor fan is below a predetermined number.
Immediately after the drive of the indoor fan is stopped, the indoor fan continuously rotates due to inertia, and the leaked refrigerant is diffused. In the above configuration, it is possible to determine whether or not the refrigerant leaks in a situation where not only the driving of the indoor fan is stopped but also the rotation of the indoor fan becomes equal to or less than a predetermined value and the refrigerant is likely to stay.
The determination as to whether the rotation speed of the indoor fan is equal to or less than the predetermined number may be made by directly detecting the rotation speed, or the elapsed time after the indoor fan stops driving is measured. It may be done by.

(5) It is preferable that a refrigerant reservoir for storing leaked refrigerant is formed around the connection portion, and the temperature sensor is provided inside the refrigerant reservoir.
With such a configuration, the refrigerant leaking from the connection portion can be stored in the refrigerant reservoir, and the temperature of the leaked refrigerant can be reliably detected by the temperature sensor.

(6) It is preferable that the said refrigerant | coolant reservoir part contains the shielding member which shields the downward direction of the said connection part.
With such a configuration, the leaked refrigerant can be prevented from flowing downward, and the temperature of the refrigerant can be reliably detected by the temperature sensor.

(7) The refrigerant reservoir may include a cover member that covers the outside of the connection portion.
With such a configuration, it is possible to suppress the leaked refrigerant from diffusing to the outside of the connection portion, and the temperature of the refrigerant can be reliably detected by the temperature sensor.

  According to the present invention, it is possible to improve the determination accuracy of the presence or absence of refrigerant leakage.

It is a schematic block diagram of the air conditioning apparatus in one embodiment of this invention. It is front explanatory drawing which shows the inside of an indoor unit. It is side surface explanatory drawing which shows the inside of an indoor unit. It is a front view which shows the connection part of refrigerant | coolant piping. It is AA arrow sectional drawing of FIG. It is a flowchart which shows an example of the determination procedure of the refrigerant | coolant leakage in the determination part of a control part.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an air conditioner according to an embodiment of the present invention.
The air conditioner 10 of the present embodiment adjusts the indoor temperature by a vapor compression refrigeration cycle, and includes an indoor unit 12, an outdoor unit 13, and a refrigerant circuit 11 provided therebetween. I have.

  The refrigerant circuit 11 includes a compressor 15 that compresses the refrigerant to generate a high-temperature and high-pressure gas refrigerant, an indoor heat exchanger 16, and an electronic expansion valve (expansion means) that decompresses the refrigerant to generate a low-temperature and low-pressure liquid refrigerant. ) 17, an outdoor heat exchanger 18, and a refrigerant pipe 19 that sequentially connects them. The indoor unit 12 and the outdoor unit 13 are provided with an indoor fan 20 and an outdoor fan 21 that send air to the indoor heat exchanger 16 and the outdoor heat exchanger 18, respectively.

  The refrigerant pipe 19 is provided with a four-way switching valve 23. By switching the four-way switching valve 23, the refrigerant flow is reversed, and the refrigerant discharged from the compressor 15 is exchanged with the outdoor heat exchanger 18 and the indoor heat. It is possible to switch between the cooling operation and the heating operation by switching and supplying to the exchanger 16.

  Specifically, during heating operation, the four-way switching valve 23 is switched as indicated by a solid line, whereby the refrigerant flows in the direction indicated by the solid line arrow, whereby the refrigerant discharged from the compressor 15 is passed to the indoor heat exchanger 16. The refrigerant that has been supplied and passed through the electronic expansion valve 17 is supplied to the outdoor heat exchanger 18. At this time, the indoor heat exchanger 16 functions as a condenser, and condenses and liquefies the high-temperature and high-pressure gaseous refrigerant. The outdoor heat exchanger 18 functions as an evaporator, and evaporates and vaporizes the low-temperature and low-pressure liquid refrigerant.

  During the cooling operation, the refrigerant flow is reversed by switching the four-way switching valve 23 as indicated by the dotted line, and the refrigerant flows in the direction indicated by the dotted arrow. As a result, the refrigerant discharged from the compressor 15 is supplied to the outdoor heat exchanger 18, and the refrigerant that has passed through the electronic expansion valve 17 is supplied to the indoor heat exchanger 16. At this time, the outdoor heat exchanger 18 functions as a condenser, and condenses and liquefies a high-temperature and high-pressure gaseous refrigerant. The indoor heat exchanger 16 functions as an evaporator, and evaporates and vaporizes the low-temperature and low-pressure liquid refrigerant.

  Moreover, the air conditioning apparatus 10 of this Embodiment can perform the defrost operation for removing the frost adhering to the outdoor side heat exchanger 18 when performing the heating operation. In the defrosting operation, during the heating operation, when the temperature of the fins of the outdoor heat exchanger 18 or the outdoor air temperature reaches a predetermined temperature, the indoor side is temporarily set to the cooling operation by switching the four-way switching valve 23. The frost is dissolved and removed by supplying a high-temperature and high-pressure gaseous refrigerant to the outdoor heat exchanger 18. Such defrost operation is called reverse cycle defrost operation. During the reverse cycle defrost operation, the low-temperature and low-pressure liquid refrigerant flows through the indoor heat exchanger 16, and thus the driving of the indoor fan 20 is stopped so that the cold air does not blow out into the room.

  The operation of the electronic expansion valve 17, the four-way switching valve 23, the compressor 15, and the fans 20 and 21 is controlled by a control device in accordance with on / off of an operation switch and a sensor output such as a temperature sensor. Moreover, in this Embodiment, the refrigerant | coolant which has slight combustibility (slightly flammability), for example, R32 refrigerant | coolant, is used as a refrigerant | coolant.

  The refrigerant pipe 19 includes a liquid side refrigerant communication pipe 25 and a gas side refrigerant communication pipe 26 that connect the indoor unit 12 and the outdoor unit 13. In the indoor unit 12, a liquid side refrigerant communication pipe 25 is connected to a refrigerant pipe (liquid side connection pipe) 27 connected to the liquid side end of the indoor side heat exchanger 16 via a connection portion 31. On the other hand, a gas side refrigerant communication pipe 26 is connected to a refrigerant pipe (gas side connection pipe) 28 connected to the gas side end of the indoor heat exchanger 16 via a connection portion 32. A temperature sensor 33 for detecting refrigerant leakage is provided in the vicinity of each of the connection portions 31 and 32.

  The indoor unit 12 is provided with a control unit 40. The control unit 40 includes a fan driving unit 41 for controlling the operation of the indoor fan 20 as a functional unit. As described above, when the heating operation or the cooling operation is performed, the indoor fan 20 is driven by the fan driving unit 41. Further, when the defrost operation is performed, the drive of the indoor fan 20 is stopped by the fan drive unit 41. Moreover, the control part 40 is provided with the determination part 42 for determining the leakage of a refrigerant | coolant. Details of the determination unit 42 will be described later.

FIG. 2 is an explanatory front view showing the inside of the indoor unit 12, and FIG. 3 is an explanatory side view showing the inside of the indoor unit 12.
The indoor unit 12 is a floor-standing type and includes a rectangular parallelepiped casing 51 that is long in the vertical direction. Specifically, the casing 51 has an upper wall 52a, a bottom wall 52b, left and right side walls 52c and 52d, and a rear wall 52e, and a front surface that closes a front opening of the casing main body 52 and a casing main body 52 that is open at the front. A panel 53 and an intake grill 54 are provided. Then, the bottom wall 52 b of the casing body 52 is placed on the floor surface F.

  The inside of the casing 51 is partitioned into upper and lower portions, the indoor heat exchanger 16 is disposed in the upper region, and the indoor fan 20 is disposed in the lower region. A front panel 53 is provided in front of the indoor heat exchanger 16, and an intake grill 54 is provided in front of the indoor fan 20. An air outlet 53 a is provided in the upper part of the front panel 53.

The indoor fan 20 is configured by accommodating a multiblade fan 20b inside a fan casing 20a. The indoor fan 20 operates to suck indoor air through the intake grille 54 and discharge it to the upper region of the casing 51.
The indoor heat exchanger 16 is arranged so as to be inclined so that the upper part is located rearward and the lower part is located forward. The air discharged from the indoor fan 20 exchanges heat with the refrigerant in the process of passing through the indoor heat exchanger 16 and is blown out from the outlet 53 a of the front panel 53.

  The gas side connection pipe 28 and the liquid side connection pipe 27 connected to the indoor side heat exchanger 16 are respectively drawn downward from the upper area of the casing 51 to the lower area, and are arranged in front of the indoor fan 20. . The refrigerant communication pipes 25 and 26 are drawn from the outside into the lower part of the casing 51 and extend upward, and are disposed in front of the indoor fan 20. And the lower end part of the liquid side connection piping 27 and the gas side connection piping 28 and the upper end of the refrigerant | coolant communication piping 25 and 26 are connected via the connection parts 31 and 32. FIG.

FIG. 4 is a front view showing the connection portions 31 and 32 of the refrigerant pipes (connection pipes 27 and 28 and connection pipes 25 and 26), and FIG. 5 is a cross-sectional view taken along line AA in FIG.
The connection parts 31 and 32 are flare pipe joints 61 and 62 provided at the lower ends of the liquid side connection pipe 27 and the gas side connection pipe 28, and flare nuts 64 provided at the upper ends of the refrigerant communication pipes 25 and 65. A heat insulating material 29 is wound around each of the liquid side connection pipe 27, the gas side connection pipe 28, and the refrigerant communication pipes 25 and 26. And after connecting the refrigerant | coolant communication piping 25 and 26 to the liquid side connection piping 27 and the gas side connection piping 28, the heat insulating material 63 is wound around the connection parts 31 and 32 further.

  The liquid side connection pipe 27 and the gas side connection pipe 28 are connected to the refrigerant communication pipes 25 and 26 at the construction site of the indoor unit 12. If these pipes 25 to 28 project forward during the connection work, the intake grille 54 may interfere and be unable to be mounted. In order to eliminate such inconvenience, the indoor unit 12 is provided with a cover member 71 that suppresses the forward extension of the pipes 25 to 28.

  As shown in FIG. 5, the cover member 71 includes a front plate 72 and a side plate 73 and is formed in a substantially L shape in plan view. The cover member 71 is formed in a substantially rectangular shape when viewed from the front (see FIG. 2). The rear end portion of the side plate 73 is fixed to the fan casing 20a of the indoor fan 20 with a fixing screw or the like. The end of the front plate 72 is fixed by being locked to the front end of the right side wall 52d of the casing body 52. The front plate 72 can prevent the front grille 72 and the refrigerant communication pipes 25 and 26 from protruding forward, thereby preventing interference with the intake grille 54.

  The connection portions 31 and 32 between the connection pipes 27 and 28 and the refrigerant communication pipes 25 and 26 are places where the refrigerant is more likely to leak than the other parts of the refrigerant circuit 11 due to poor connection in field construction or corrosion due to aging. It is. Moreover, since the connection parts 31 and 32 are disposed at a relatively low position of the indoor unit 12 and the front of the connection parts 31 and 32 is opened indoors through the intake grille 54, leakage occurs from the connection parts 31 and 32. The refrigerant that has passed through the intake grille 54 tends to stay in the vicinity of the floor F in the room, and the refrigerant concentration in the vicinity of the floor F may increase.

Therefore, in the indoor unit 12 of the present embodiment, means for preventing the refrigerant from staying near the floor surface F is taken by detecting the leakage of the refrigerant at the connecting portions 31 and 32.
Connection portions 31 and 32 in the present embodiment are arranged inside refrigerant reservoir 80. The refrigerant reservoir 80 includes outer peripheral walls 20a, 52d, 71 that cover the periphery of the connecting portions 31, 32, and a bottom wall 75 that covers the lower part.

  Specifically, the refrigerant pool 80 includes a front surface of the fan casing 20a of the indoor fan 20, a right side wall 52d of the casing body 52 of the indoor unit 12, a cover member 71 fixed to the fan casing 20a and the right side wall 52d, It is comprised by the shielding member 75 provided in the lower part side of the cover member 71. FIG. A temperature sensor 33 is disposed inside the refrigerant reservoir 80. The temperature sensor 33 is attached below the connecting portions 31 and 32 and inside the front plate 72 of the cover member 71.

  The shielding members 75 are respectively provided at the lower part of the inner surface of the front plate 72 in the cover member 71 and the front surface of the fan casing 20a facing the front plate 72, and shield the lower portions of the connecting portions 31 and 32. The shielding member 75 is formed to be elongated in the left-right direction with, for example, a foamable synthetic resin material having heat insulation properties. The refrigerant communication pipes 25 and 26 pass between the front and rear shielding members 75.

  The temperature sensor 33 detects the temperature in the refrigerant reservoir 80. And the detection signal of the temperature sensor 33 is input into the determination part 42 of the control part 40 shown in FIG. The temperature of the refrigerant leaked from the connection portions 31 and 32 is, for example, −10 ° C. to −30 ° C., which is lower than the general indoor temperature. Therefore, the determination unit 42 determines the presence or absence of refrigerant leakage based on the detected temperature input from the temperature sensor 33. Specifically, it is determined that the detected temperature is lower than a predetermined threshold (for example, −10 ° C.) as a refrigerant leakage condition.

In addition, the determination unit 42 of the present embodiment does not simply determine the presence or absence of refrigerant leakage based on the temperature detected by the temperature sensor 33, but under a situation where there is a high possibility that the refrigerant will stay near the floor surface F. The presence or absence of refrigerant leakage is determined. Specifically, the presence or absence of refrigerant leakage is determined when driving of the indoor fan 20 is stopped.
When the indoor fan 20 is driven, even if the air around the indoor unit 12 is diffused and the refrigerant leaks, it is difficult to stay near the floor surface F, and the possibility that the refrigerant reaches the flammable concentration is extremely low. Therefore, in this embodiment, it is adopted that the driving of the indoor fan 20 is stopped as the refrigerant leakage determination condition.

Next, the refrigerant leakage determination procedure in the determination unit 42 will be described.
FIG. 6 is a flowchart showing an example of the procedure.
Determination unit 42 of the control unit 40 obtains the information about the detected temperature T by the temperature sensor 33 at all times (step S1), the detection temperature T is to determine whether a predetermined threshold T ₀ or less (step S2). When the detected temperature T is the threshold value T ₀ or less, further it determines whether the stopped driving of the indoor fan 20 (step S3). If the detected temperature T is the threshold T ₀ or less, and has stopped the drive of the indoor fan 20, the determination unit 42 determines that the refrigerant leakage has occurred (step S4). Determining unit 42, in step S2, whether the detected temperature T is determined to exceed the threshold value T _0, or in step S3, when the indoor fan 20 is determined to be driven, the process to step S1 return.

  When determining that the refrigerant leakage has occurred, the determination unit 42 drives the indoor fan 20 for a predetermined time (step S5). Thereby, the refrigerant staying in the vicinity of the floor surface F can be diffused and the refrigerant can be prevented from reaching the flammable concentration. In this case, the determination unit 42 drives the indoor fan 20 for several tens of minutes to several hours. Furthermore, the determination unit 42 notifies abnormality (step S6). As a notification mode, for example, a display indicating that the refrigerant is leaking can be displayed on the display unit of the remote controller, the operation lamp can be blinked, or an alarm sound can be issued.

As described above, in the indoor unit 12 of the present embodiment, the temperature sensor 33 directly detects the temperature of the refrigerant that has leaked from the connection portions 31 and 32, and thus is based on the detection value of the temperature sensor 33. Thus, it is possible to accurately determine the presence or absence of refrigerant leakage.
Moreover, since the determination part 42 has determined the presence or absence of a refrigerant | coolant leak when the drive of the indoor fan 20 is stopped, it determines the presence or absence of a refrigerant | coolant leak in the condition where a refrigerant | coolant tends to stay near the floor surface F. be able to.

  Further, since the refrigerant reservoir 80 is provided around the connecting portions 31 and 32, the refrigerant leaked from the connecting portions 31 and 32 can be held in the refrigerant reservoir 80 to some extent, and is provided in the refrigerant reservoir 80. The temperature sensor 33 can detect the temperature of the refrigerant more reliably.

[Modification of Processing Procedure of Determination Unit 42]
In the above embodiment, the determination unit 42 stops the driving of the indoor fan 20, and the refrigerant leak determination condition is that the temperature detected by the temperature sensor 33 is equal to or lower than a predetermined threshold. Conditions can also be added.
(1) For example, the predetermined time or longer, in that the detected temperature T of the temperature sensor 33 becomes the threshold value T ₀ or less can be added to the determination condition of the refrigerant leakage. In this case, it is possible to prevent erroneous determination that the refrigerant has leaked when the temperature detected by the temperature sensor 33 is instantaneously reduced due to some disturbance. Duration detected temperature T becomes the threshold value T ₀ or less, for example, it can be set in the range of several seconds to several minutes.

  (2) Moreover, it can add to the criteria for refrigerant | coolant leakage that the air conditioning apparatus 10 is not performing reverse cycle defrost driving | operation. As described above, since the driving of the indoor fan 20 is stopped when the reverse cycle defrost operation is being performed, the refrigerant leakage determination condition is satisfied. However, during the reverse cycle defrost operation, the low-temperature liquid refrigerant is supplied to the indoor heat exchanger 16, and the ambient temperature of the temperature sensor 33 is also lowered. Therefore, it becomes difficult to determine whether or not the decrease in the temperature detected by the temperature sensor 33 is due to refrigerant leakage. Therefore, it is possible to improve the accuracy of refrigerant leakage determination by excluding that the reverse cycle defrost operation is in progress from the refrigerant leakage determination condition.

  (3) Moreover, it can add to the determination conditions of refrigerant | coolant leakage that the rotation speed of the indoor fan 20 is below predetermined number. When the indoor fan 20 is stopped from the driving state, the fan 20b is rotated by inertia for a while, and the surrounding air is diffused. Therefore, even if the refrigerant leaks, the refrigerant hardly stays around the floor surface F. Therefore, by adding that the rotational speed of the indoor fan 20 is equal to or less than the predetermined number to the refrigerant leakage determination condition, it is possible to determine the refrigerant leakage in a situation where the refrigerant is likely to stay.

  The determination unit 42 can determine that the number of rotations is equal to or less than a predetermined number by acquiring the number of rotations directly measured by a rotation sensor or the like. Further, the rotation speed of the indoor fan 20 due to inertia can be determined by the elapsed time after the drive is stopped. Therefore, the determination part 42 may acquire the elapsed time after stopping the drive of the indoor fan 20, and may determine that the elapsed time is not more than a predetermined value.

The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the invention described in the claims.
For example, the cover member 71 constituting the refrigerant reservoir 80 may be used only as a constituent member of the refrigerant reservoir 80 without having a function of pressing the refrigerant pipes 25 to 28. The shielding member 75 may block the entire bottom of the refrigerant reservoir 80.

Further, the refrigerant reservoir 80 may not include the shielding member 75. Even in this case, it is possible to suppress the diffusion of the leaked refrigerant by the outer peripheral walls (the cover member 71, the fan casing 20a, and the right side wall 52d) covering the periphery of the connection portions 31 and 32, and to detect the temperature of the refrigerant. Is possible.
Further, the refrigerant reservoir 80 may not include the cover member 71. Even in this case, since the refrigerant can be prevented from diffusing and flowing downward by the other outer peripheral walls 20a and 52d and the bottom wall (shielding member) 75, the temperature of the refrigerant can be detected. .

The determination procedure for refrigerant leakage in the determination unit 42 is not limited to that shown in FIG. For example, the determinations of step S2 and step S3 can be reversed, or the determination of step S3 can be performed before step S1.
Two temperature sensors 33 may be provided corresponding to the connection portions 31 and 32.
In the above-described embodiment, an example in which the R32 refrigerant is used as the flammable refrigerant has been described. However, the present invention can be applied to the case where other flammable refrigerant is used.

10: Air conditioner 12: Indoor unit 16: Indoor heat exchanger 20: Indoor fan 25: Liquid side refrigerant communication pipe 26: Gas side refrigerant communication pipe 27: Liquid side connection pipe 28: Gas side connection pipe 31: Connection part 32: Connection unit 33: Temperature sensor 42: Determination unit 71: Cover member 75: Shield member 80: Refrigerant reservoir

Claims (7)

A refrigerant pipe (27, 28), a heat exchanger (16) for exchanging heat between the refrigerant flowing through the refrigerant pipe (27, 28) and air, and an air flow passing through the heat exchanger (16) A floor to which the refrigerant pipe (27, 28) is connected via a connecting pipe (25, 26) and a connecting part (31, 32) provided from outside the room. It is a standing indoor unit,
A temperature sensor (33) disposed in the vicinity of the connection (31, 32);
A determination unit (42) for determining the presence or absence of refrigerant leakage from the connection unit (31, 32) based on the detection result of the temperature sensor (33) when driving of the indoor fan (20) is stopped. An air conditioner indoor unit.   The indoor unit of an air conditioner according to claim 1, wherein the determination unit (42) determines whether or not refrigerant leaks when the drive of the indoor fan (20) is stopped except during the reverse cycle defrost operation. .   The said determination part (42) determines with the refrigerant | coolant leakage having arisen, when the detected value of the said temperature sensor (33) continues more than predetermined time and satisfy | fills the leakage conditions. Air conditioner indoor unit.   The indoor part of the air conditioning apparatus according to any one of claims 1 to 3, wherein the determination unit (42) determines whether or not refrigerant leaks when the rotational speed of the indoor fan (20) is a predetermined number or less. Machine.   The refrigerant reservoir (80) for storing a leaked refrigerant is formed around the connecting portions (31, 32), and the temperature sensor (33) is provided inside the refrigerant reservoir (80). The indoor unit of the air conditioning apparatus of any one of 1-4.   The indoor unit of an air conditioner according to claim 5, wherein the refrigerant reservoir (80) includes a shielding member (75) that shields a lower part of the connection part (31, 32).   The indoor unit of an air conditioner according to claim 5 or 6, wherein the refrigerant reservoir (80) includes a cover member (71) that covers the outside of the connecting portion (31, 32).

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