Indoor unit and air conditioner

Abstract

To obtain an indoor unit in which drain water retained in a drain pan can be more reliably discharged by a drain pump, and an air conditioning device.SOLUTION: An indoor unit is provided with an indoor heat exchanger 1, a drain pan 2 for retaining drain water W1 dropping from the indoor heat exchanger 1, a drain pump 3 for discharging the drain water W1 from the drain pan 2, a water level sensor 7 for detecting the water level of the drain water W1 retained in the drain pan 2, an agitation device 6 for agitating the drain water W1 retained in the drain pan 2, and a control device 10 for controlling the driving of the agitation device 6 on the basis of the detection result of the water level sensor 7.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an indoor unit and an air conditioning apparatus. [Background technology]

[0002] Conventionally, there is known an air conditioner that includes a heat exchanger, a drain pan, a water level sensor, a drain pump, and a metal body. The drain pan stores drain water that drips from the heat exchanger. The water level sensor detects the level of the drain water stored in the drain pan. The drain pump sucks in and discharges the drain water stored in the drain pan based on the detection result of the water level sensor. The metal body is disposed near the electrode of the water level sensor. Metal ionization of the metal body is promoted by passing a current from the electrode to the metal body via the drain water. An antibacterial effect is generated by diffusing the metal ions into the drain water. As a result, the proliferation of bacteria in the drain water is suppressed (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-236422 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in an air conditioner such as that described in Patent Document 1, metal ions in the drain water are discharged from the drain pan together with the drain water. Therefore, the antibacterial effect may decrease over time. In addition, the antibacterial effect may decrease if dirt or the like adheres to the surface of the metal body and the surface of the metal body is covered. For this reason, the proliferation of germs in the drain water cannot be suppressed, and there is a risk that the function of discharging the drain water from the drain pan will be reduced by the coating of metabolic products of the germs.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide an indoor unit and an air conditioning apparatus that can more reliably discharge drain water stored in a drain pan using a drain pump. [Means for solving the problem]

[0006] The indoor unit according to the present disclosure includes a heat exchanger, a drain pan that stores drain water dripping from the heat exchanger, a drain pump that discharges the drain water from the drain pan, a water level sensor that detects the level of the drain water stored in the drain pan, an agitator that agitates the drain water stored in the drain pan, and a control device that controls the operation of the agitator based on a detection result of the water level sensor. The drain pan is provided at a position facing the suction port of the drain pump and has a storage section for storing drain water, and a circulation flow path for storing the drain water together with the storage section and circulating the drain water by an agitator. The circulation flow path has a bottom surface having a turbulence generating section for generating turbulence in the drain water, and a wall surface extending upward from a side portion of the bottom surface. is. The indoor unit of the present disclosure comprises a heat exchanger, a drain pan for storing drain water dripping from the heat exchanger, a drain pump for discharging the drain water from the drain pan, a water level sensor for detecting the level of the drain water stored in the drain pan, an agitator for agitating the drain water stored in the drain pan, and a control device for controlling the operation of the agitator based on the detection result of the water level sensor, and the control device starts operating the agitator when the water level sensor detects that the level of the drain water has exceeded a mixing start water level, the mixing start water level being a water level lower than the discharge start water level at which the drain pump starts to be driven.

[0007] An air-conditioning apparatus according to the present disclosure includes the above-mentioned indoor unit, and an outdoor unit connected to the above-mentioned indoor unit by a refrigerant piping. Effect of the Invention

[0008] According to the present disclosure, drain water stored in a drain pan can be more reliably discharged by the drain pump. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic configuration diagram of an indoor unit of an air conditioner according to a first embodiment. [Diagram 2] FIG. 2 is a top view of the drain pan of FIG. 1 . [Diagram 3] FIG. 2 is a functional block diagram of the air conditioning apparatus of FIG. [Figure 4] 4 is a flowchart illustrating an example of control of an agitator provided in the indoor unit of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Embodiment 1 Fig. 1 is a schematic configuration diagram of an indoor unit of an air conditioner in embodiment 1. In embodiment 1, a ceiling-embedded indoor unit that can be embedded in a room ceiling will be described.

[0011] The indoor unit in the first embodiment is equipped with a centrifugal blower. The indoor unit is connected to an expansion valve (not shown) and an outdoor unit (not shown) through a refrigerant pipe (not shown). The indoor unit and the outdoor unit have a function of forming a refrigeration cycle for refrigeration or air conditioning by circulating the refrigerant through the refrigerant pipe and the expansion valve by a compressor (not shown).

[0012] As shown in Fig. 1, an indoor heat exchanger 1, a drain pan 2, a drain pump 3, a drain pipe 4, a water level sensor 5, an agitator 6, a water level sensor 7, and a control device 10 are provided in the indoor unit of the air conditioner. The indoor heat exchanger 1 is fixed on a base portion 25 that is provided upward from the drain pan 2. The drain pump 3 and the water level sensor 5 are controlled by the control device 10. The agitator 6 and the water level sensor 7 are also controlled by the control device 10. The details will be described later, but the control device 10 is composed of, for example, a read only memory (ROM), a random access memory (RAM), and a central processing unit (CPU).

[0013] The air conditioner has a function of performing cooling operation in which the indoor heat exchanger 1 functions as an evaporator. The air conditioner has a function of discharging drain water W1 accumulated in the drain pan 2 by cooling operation. Since the first embodiment is characterized by a configuration related to the state before the drain water W1 is discharged, the following description will focus on the characteristic parts.

[0014] The indoor heat exchanger 1 in the first embodiment functions as a heat exchanger in the present disclosure.

[0015] The drain pan 2 is provided below the indoor heat exchanger 1. The drain pan 2 is molded using synthetic resin as a material. The drain pan 2 has an internal storage space for drain water W1. A storage section 21 and a circulation flow path 22 are formed in the storage space of the drain pan 2. The drain pan 2 is a container that can receive water dripping from the indoor heat exchanger 1 and store it as drain water W1.

[0016] The storage section 21 is formed in a position outside the circulation flow path 22 in the storage space of the drain pan 2 to facilitate the drainage of the drain water W1 by the drain pump 3. The bottom surface 211 of the storage section 21 is large enough to accommodate the drain pump 3 and the water level sensor 5 above the bottom surface 211. The storage section 21 also has a function of storing the drain water W1. The circulation flow path 22 is formed along the indoor heat exchanger 1. The circulation flow path 22 stores the drain water W1 together with the storage section 21, and is a flow path through which the drain water W1 is circulated by the agitator 6. The circulation flow path 22 is horizontally provided in the storage space of the drain pan 2. The circulation flow path 22 has a bottom surface 221 and a wall surface 222. The bottom surface 221 has a turbulent flow generating portion 221a. In the turbulent flow generating section 221a, the cross-sectional shape perpendicular to the bottom surface 221 along the circulation flow path 22 is an uneven shape. In the example of FIG. 1, the uneven shape is, for example, a square shape. That is, the bottom surface 221 is provided with a plurality of protrusions 221a1 as shown in FIG. 1 as the turbulent flow generating section 221a. The wall surface 222 is formed as a surface extending upward from the side of the bottom surface 221. The bottom surface 211 of the storage section 21 and the bottom surface 221 of the circulation flow path 22 are formed at the same height. This is because it is assumed that the drain water W1 is stirred by the stirring device 6, and therefore it is not necessary to provide the bottom surface 211 of the storage section 21 at a lower position than other parts.

[0017] The drain pump 3 has a motor (not shown) therein. A suction port 31 is provided on the bottom surface of the drain pump 3. The installation position of the drain pump 3 is adjusted so that the position of the suction port 31 is inside the storage section 21. In addition, a discharge port 32 is provided on the side surface of the drain pump 3. A drain pipe 4 is connected to the discharge port 32.

[0018] The drain pump 3 has a function of generating a negative pressure inside by driving a motor (not shown) and sucking water in the drain pan 2 through the suction port 31. The installation position of the drain pump 3 is adjusted so that the position of the suction port 31 is at a position where the water level of the drain water W1 is at which the suction of the drain water W1 begins.

[0019] The drain pipe 4 has a flow path therein through which water can flow. One end of the drain pipe 4 is connected to the discharge port 32 of the drain pump 3. The other end of the drain pipe 4 is open to the outside of the indoor unit. Drain water W1 in the drain pan 2 pumped up by the drain pump 3 is discharged to the outside of the indoor unit via the drain pipe 4.

[0020] The water level sensor 5 is provided on the side of the drain pump 3. The water level sensor 5 is a sensor that detects the water level of the drain water W1 in the drain pan 2. The water level sensor 5 may be configured to detect the water level of the drain water W1 near the drain pump 3 in the drain pan 2. Therefore, any sensor such as an ultrasonic sensor or an optical sensor can be used as the water level sensor 5. The water level sensor 5 has a function of outputting information on the detected water level of the drain water W1 to the control device 10.

[0021] The agitator 6 is disposed at a position facing the drain pump 3 in the horizontal direction and facing the circulation flow path 22 in the vertical direction. The installation height of the agitator 6 is lower than the installation height of the drain pump 3. The agitator 6 has a shaft 6a, a number of fins 6b attached around one end of the shaft 6a, and a drive unit 6c provided at the other end of the shaft 6a. The drive unit 6c is connected to the control device 10.

[0022] The installation height of the agitator 6 refers to the installation height of the fins 6b. The installation height of the drain pump 3 refers to the installation height of the suction port 31.

[0023] The drive unit 6c can rotate the shaft 6a in response to a control command from the control device 10. For example, when the drive unit 6c rotates the shaft 6a while the multiple fins 6b are immersed in the drain water W1, the multiple fins 6b can agitate the drain water W1. When the drain water W1 is agitated by the multiple fins 6b, the drain water W1 can circulate through the circulation flow path 22. In addition, when the drain water W1 circulates through the circulation flow path 22, the turbulence generating unit 221a can generate turbulence in the drain water W1.

[0024] The control of the stirring device 6 will be described in detail later.

[0025] The water level sensor 7 is provided on the side of the agitator 6. The water level sensor 7 is a sensor that detects the water level of the drain water W1 in the drain pan 2. The water level sensor 7 may be configured to detect the water level of the drain water W1 near the agitator 6 in the drain pan 2. Therefore, any sensor such as an ultrasonic sensor or an optical sensor can be used as the water level sensor 7. The water level sensor 7 has a function of outputting information on the detected water level of the drain water W1 to the control device 10.

[0026] It should be noted that the water level sensor 7 in the first embodiment functions as a water level sensor in the present disclosure.

[0027] At least one of the agitator 6 and the water level sensor 7 is provided detachably to the drain pan 2.

[0028] 2 is a bird's-eye view of the drain pan 2 of FIG. 1 viewed from above. As shown in FIG. 2, a main body air inlet 23 is provided in the center of the drain pan 2. The main body air inlet 23 is a through hole. A bell mouth (not shown) is provided on the edge of the main body air inlet 23. A centrifugal blower (not shown) is provided above the bell mouth. Therefore, the indoor heat exchanger 1 provided on the base portion 25 is installed so as to surround the centrifugal blower (not shown). In addition, four main body air outlets 24 are provided between the circulation flow path 22 and the outer edge of the drain pan 2.

[0029] Therefore, the indoor unit has a function of generating negative pressure inside by driving the centrifugal blower. The indoor unit also has a function of exchanging heat with the air that has flowed into the indoor unit through the bellmouth and the centrifugal blower in the indoor heat exchanger 1. The indoor unit also has a function of blowing the air that has been heat exchanged in the indoor heat exchanger 1 out into the room from four directions through the four main body air outlets 24.

[0030] As described above, as is clear from Fig. 2, the storage section 21 is formed integrally with the circulation flow path 22 on the outside of the circulation flow path 22. This arrangement makes it easy to discharge the drain water W1 by the drain pump 3 installed above the storage section 21. The bottom surface 211 of the storage section 21 has the same depth as the bottom surface 221 of the circulation flow path 22. Note that Fig. 2 omits the drain pump 3, the stirring device 6, the indoor heat exchanger 1, and the like shown in Fig. 1, but a cross section of the drain pan 2 taken along line BB in Fig. 2 corresponds to the drain pan 2 in Fig. 1.

[0031] Fig. 3 is a functional block diagram of the air conditioner of Fig. 1. As shown in Fig. 3, the control device 10 includes a control unit 11 and a storage unit 13. The control device 10 is connected to a drain pump 3, a water level sensor 5, an agitator 6, a water level sensor 7, and the like. Although not shown, the control device 10 is also connected to a compressor, an expansion valve, a centrifugal blower, and an outdoor fan. The outdoor fan is provided in an outdoor unit (not shown). The control device 10 is capable of performing refrigeration or air conditioning by controlling the compressor, the expansion valve, the centrifugal blower, and the outdoor fan.

[0032] The storage unit 13 stores data corresponding to a mixing start water level that is a trigger for starting the operation of the mixing device 6. The storage unit 13 also stores data corresponding to a discharge start water level that is a trigger for starting the operation of the drain pump 3. The mixing start water level is set to a water level lower than the discharge start water level.

[0033] The control unit 11 compares the detection result of the water level sensor 7 with the data corresponding to the agitation start water level, and when the detection result of the water level sensor 7 exceeds the data corresponding to the agitation start water level, it determines that the water level sensor 7 has detected that the water level of the drain water W1 has exceeded the agitation start water level. In this case, the control unit 11 starts driving the agitator 6.

[0034] Furthermore, when the detection result of the water level sensor 7 is less than the data corresponding to the mixing start water level and the mixing device 6 is in operation, the control unit 11 stops the operation of the mixing device 6. Furthermore, when the detection result of the water level sensor 7 is less than the data corresponding to the mixing start water level and the mixing device 6 is not in operation, the control unit 11 keeps the mixing device 6 in a stopped state.

[0035] The control unit 11 also compares the detection result of the water level sensor 5 with data corresponding to the discharge start water level, and when the detection result of the water level sensor 5 exceeds the data corresponding to the discharge start water level, determines that the water level sensor 5 has detected that the water level of the drain water W1 has exceeded the discharge start water level. In this case, the control unit 11 starts driving the drain pump 3.

[0036] Furthermore, when the detection result of the water level sensor 5 is below the data corresponding to the discharge start water level and the drain pump 3 is operating, the control device 10 stops the operation of the drain pump 3. Furthermore, when the detection result of the water level sensor 5 is below the data corresponding to the discharge start water level and the drain pump 3 is not operating, the control unit 11 keeps the drain pump 3 in the stopped state.

[0037] In other words, the control unit 11 has the function of controlling the drainage of drain water W1 accumulated in the drain pan 2 by operating the drain pump 3 based on the detection result of the water level sensor 5 while refrigeration or air conditioning is being performed in the air conditioning apparatus.

[0038] In addition, the control unit 11 has the function of controlling the stirring of the drain water W1 accumulated in the drain pan 2 by operating the stirring device 6 based on the detection result of the water level sensor 7 while refrigeration or air conditioning is being performed in the air conditioning apparatus.

[0039] Next, an example of control of the stirring device 6 by the control unit 11 will be described with reference to FIG.

[0040] Fig. 4 is a flowchart explaining an example of control of the agitator 6 provided in the indoor unit of Fig. 1. The flowchart in Fig. 4 is a process that is called when the air conditioner starts refrigeration or air conditioning, and is a process that ends when the air conditioner ends refrigeration or air conditioning. In other words, while the air conditioner is performing refrigeration or air conditioning, the process of the flowchart in Fig. 4 continues to be executed as a resident process.

[0041] In step S1, the control device 10 determines whether or not the water level of the drain water W1 has exceeded the stirring start water level. If the control device 10 determines that the water level of the drain water W1 has exceeded the stirring start water level, the process of step S1 proceeds to the process of step S2. In step S2, the control device 10 starts driving the stirring device 6. Next, the process of step S2 proceeds to the process of step S5.

[0042] On the other hand, in step S1, when the control device 10 determines that the water level of the drain water W1 is lower than the stirring start water level, the process of step S1 transitions to a process of S3.

[0043] In step S3, the control device 10 determines whether the agitator 6 is driven. If the control device 10 determines that the agitator 6 is driven, the process of step S3 proceeds to the process of step S4. In step S4, the control device 10 stops the drive of the agitator 6. Next, the process of step S4 returns to the process of step S1.

[0044] On the other hand, if the control device 10 determines in step S3 that the stirring device 6 is not driven, the process of step S3 returns to the process of step S1.

[0045] In step S5, the control device 10 determines whether or not the water level of the drain water W1 has exceeded the discharge start water level. If the control device 10 determines that the water level of the drain water W1 has exceeded the discharge start water level, the process of step S5 proceeds to the process of step S6. In step S6, the control device 10 starts driving the drain pump 3. Next, the process of step S6 returns to the process of step S5.

[0046] On the other hand, if the control device 10 determines in step S5 that the water level of the drain water W1 does not exceed the discharge start water level, the process of step S5 proceeds to the process of step S7. In step S7, the control device 10 determines whether the drain pump 3 is operating. If the control device 10 determines that the drain pump 3 is operating, the process of step S7 proceeds to the process of step S8. In step S8, the control device 10 stops the operation of the drain pump 3. Next, the process of step S8 returns to the process of step S1.

[0047] On the other hand, if the control device 10 determines in step S7 that the drain pump 3 is not being driven, the process of step S7 returns to the process of step S5.

[0048] In the above series of processes, when the agitator 6 starts to operate, the drain water W1 stored in the circulation flow path 22 starts to circulate in the circulation flow path 22. When the drain water W1 circulates in the circulation flow path 22, the drain water W1 collides with the turbulent flow generating section 221a. Thus, turbulent flow of the drain water W1 is generated in the turbulent flow generating section 221a. The turbulent flow of the drain water W1 is irregular in time and space, which weakens the bonds between the germs contained in the drain water W1. As a result, the proliferation of the germs in the drain water W1 can be suppressed, and the generation of a coating of the metabolites of the germs can be suppressed. This allows the drain water W1 stored in the drain pan 2 to be discharged by the drain pump 3 more reliably.

[0049] According to the above description, in the first embodiment, the control device 10 controls the driving of the agitator 6 based on the detection result of the water level sensor 7. Thus, the drain water W1 stored in the drain pan 2 is agitated. Therefore, the agitator 6 can suppress the proliferation of germs contained in the drain water W1. This can suppress the generation of foreign matter such as slime or biofilm in the drain water W1 as a coating of metabolic products of germs, so that the drain water W1 stored in the drain pan 2 can be discharged by the drain pump 3 more reliably.

[0050] In the first embodiment, the bottom surface 221 of the circulation flow path 22 is provided with a turbulence generating section 221a that generates turbulence in the drain water W1. Thus, the turbulence generating section 221a generates turbulence in the drain water W1 circulating through the circulation flow path 22. Thus, the turbulence generating section 221a weakens the bonds between the germs contained in the drain water W1. This makes it possible to suppress the generation of foreign matter such as slime or biofilm in the drain water W1 as a coating of metabolic products of the germs.

[0051] In the first embodiment, the cross-sectional shape of the turbulent flow generating section 221a perpendicular to the bottom surface 221 along the circulation flow path 22 is an uneven shape, so that a turbulent flow can be generated throughout the entire circulation flow path 22. Therefore, it is possible to significantly suppress the generation of foreign matter such as slime or biofilm in the drain water W1 as a coating of metabolic products of unwanted bacteria.

[0052] In addition, in the first embodiment, since the circulation flow path 22 is provided horizontally, the drain water W1 can easily circulate through the circulation flow path 22. Therefore, the generation of foreign matter such as slime or biofilm in the drain water W1 as a coating of metabolic products of various bacteria can be particularly significantly suppressed.

[0053] In addition, in the first embodiment, at least one of the water level sensor 7 and the agitator 6 is detachably provided to the drain pan 2, so that at least one of the water level sensor 7 and the agitator 6 can be retrofitted to the drain pan 2. Therefore, at least one of the water level sensor 7 and the agitator 6 can be provided only when necessary.

[0054] Furthermore, in the first embodiment, the installation height of the stirring device 6 is lower than the installation height of the drain pump 3, so that the drain water W1 can be stirred before the drain pump 3 starts discharging the drain water W1. Therefore, when the discharge of the drain water W1 starts, the drain water W1 is in a stirred state. Therefore, when the drain pump 3 discharges the drain water W1, it is possible to avoid the inclusion of foreign matter such as slime or biofilm.

[0055] In addition, in the first embodiment, the stirring start water level is lower than the discharge start water level of the drain water W1, so stirring of the drain water W1 can be started in a state where the drain water W1 capable of stirring the drain water W1 is accumulated in the drain pan 2. This makes it easier to generate turbulence, and the generation of foreign matter such as slime or biofilm can be extremely significantly suppressed.

[0056] In the first embodiment, refrigeration or air conditioning is performed by an air conditioner including an indoor unit in which the agitator 6 is provided and an outdoor unit. Therefore, refrigeration or air conditioning can be performed while suppressing the generation of foreign matter such as slime or biofilm.

[0057] In the first embodiment, an example is described in which the cross-sectional shape of the turbulent flow generating section 221a perpendicular to the bottom surface 221 along the circulation flow path 22 is rectangular, but this is not particularly limited to this. For example, the cross-sectional shape perpendicular to the bottom surface 221 along the circulation flow path 22 may be triangular or semicircular. In short, the turbulent flow generating section 221a may be configured to generate turbulence in the drain water W1, and may be configured as an obstacle that impedes the progress of the drain water W1 flowing through the circulation flow path 22, for example.

[0058] In addition, in the first embodiment, an example is described in which bottom surface 211 of storage section 21 and bottom surface 221 of circulation flow path 22 are formed at the same height, but this is not particularly limited. For example, bottom surface 211 of storage section 21 may be formed at a position lower than bottom surface 221 of circulation flow path 22.

[0059] Also, in the first embodiment, an example is described in which the water level sensor 5 is provided for determining whether to start driving the drain pump 3, and the water level sensor 7 is provided for determining whether to start driving the agitator 6, but the present invention is not particularly limited to this. One sensor capable of detecting the water level of the drain water W1 may be provided, and the control device 10 may determine whether to start driving the drain pump 3 and the agitator 6 based on the detection result of the sensor. In this case, the zero level may be appropriately adjusted so that the water level of the drain water W1 around the agitator 6 and the water level of the drain water W1 around the drain pump 3 can be accurately detected according to the installation location of the sensor. [Explanation of symbols]

[0060] 1 indoor heat exchanger, 2 drain pan, 3 drain pump, 4 drain pipe, 5 water level sensor, 6 agitator, 6a shaft, 6b fins, 6c drive unit, 7 water level sensor, 10 control device, 11 control unit, 13 memory unit, 21 storage unit, 22 circulation flow path, 23 main body air intake port, 24 main body outlet port, 25 base unit, 31 suction port, 32 outlet port, 211 bottom surface, 221 bottom surface, 221a turbulence generating unit, 221a1 protrusion, 222 wall surface, W1 drain water.

Claims

1. A heat exchanger; A drain pan for storing drain water dripping from the heat exchanger; a drain pump that discharges the drain water from the drain pan; a water level sensor that detects the level of the drain water stored in the drain pan; An agitator that agitates the drain water stored in the drain pan; A control device that controls the drive of the stirring device based on a detection result of the water level sensor; Equipped with The drain pan is a storage section provided at a position opposite to a suction port of the drain pump and configured to store the drain water; a circulation flow path that stores the drain water together with the storage portion and circulates the drain water by the agitator; having The circulation flow path is a bottom surface having a turbulence generating portion for generating turbulence in the drain water; A wall surface extending upward from a side portion of the bottom surface; An indoor unit having the above structure.

2. The indoor unit according to claim 1 , wherein a cross-sectional shape of the turbulent flow generating section perpendicular to the bottom surface along the circulation flow path is an uneven shape.

3. The indoor unit according to claim 1 or 2, wherein the circulation flow path is provided horizontally.

4. The indoor unit according to claim 1 , wherein at least one of the water level sensor and the agitator is detachably provided with respect to the drain pan.

5. The indoor unit according to any one of claims 1 to 4, wherein an installation height of the agitator is lower than an installation height of the drain pump.

6. the control device starts driving the agitator when the water level sensor detects that the drain water level has exceeded an agitation start water level; The indoor unit according to any one of claims 1 to 5, wherein the mixing start water level is a water level lower than a discharge start water level at which driving of the drain pump is started.

7. A heat exchanger; A drain pan for storing drain water dripping from the heat exchanger; a drain pump that discharges the drain water from the drain pan; a water level sensor that detects the level of the drain water stored in the drain pan; An agitator that agitates the drain water stored in the drain pan; A control device that controls the drive of the stirring device based on a detection result of the water level sensor; Equipped with the control device starts driving the agitator when the water level sensor detects that the drain water level has exceeded an agitation start water level; The indoor unit wherein the mixing start water level is a water level lower than a discharge start water level at which driving of the drain pump is started.

8. An indoor unit according to any one of claims 1 to 7; an outdoor unit connected to the indoor unit by a refrigerant pipe; An air conditioning device comprising:

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