JP7595262B2 - Air conditioner indoor unit - Google Patents

Description

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

Background Art Conventionally, there has been known an air conditioning apparatus equipped with an indoor unit having a housing that houses a heat exchanger with refrigerant piping through which a refrigerant flows and a blower fan, the housing being installed on the ceiling of a room.
Such an indoor unit of an air conditioner includes an intake port provided in the housing, an outlet port, and a bellmouth housed inside the housing. In this indoor unit of an air conditioner, indoor air is drawn into the housing from the intake port by driving the blower fan. The air drawn into the housing is rectified by the bellmouth and heat exchanged in the heat exchanger, and then blown out into the room from the outlet port.
Among indoor units of such air conditioners, there are known those that are provided with a refrigerant leakage detection sensor that detects leakage of refrigerant inside the indoor unit (see, for example, Patent Document 1).

JP 2015-132450 A

However, in a conventional indoor unit, there is a risk that the need to secure space for disposing a refrigerant leakage detection sensor may hinder miniaturization of the indoor unit.
Furthermore, depending on the location of the refrigerant leak detection sensor, the flow of air drawn into the housing may be blocked, resulting in a decrease in the air flow rate near the intake port or bell mouth, or the generation of abnormal noise.
The present invention provides an indoor unit for an air conditioner that is capable of detecting refrigerant leakage while minimizing changes to the internal structure of the housing.

The present invention relates to a cooling system for a cooling fan that includes a housing, a blower, an indoor heat exchanger having a refrigerant piping, and a bell mouth that rectifies the air drawn into the blower , the housing includes a drain pan that covers the indoor heat exchanger from below, the bell mouth forms at least a part of a flow path through which the air drawn into the blower flows, the bell mouth includes a horizontal portion that is formed in a frame shape so as to fit along an upper surface of the drain pan and extends substantially horizontally, and a cylindrical portion that rises upward in a curved shape from an inner peripheral portion of the horizontal portion, and This indoor unit for an air conditioning device is characterized in that the top surface has a recess in which electrical components are housed, the recess being provided on the horizontal portion and housing a refrigerant leakage detection sensor for detecting refrigerant, and the indoor unit is provided with a lid body covering the recess, the lid body being formed to extend circumferentially along the horizontal portion when viewed in a plane, one end of the lid body being provided with a first air vent port connecting the recess to the outside of the recess, and a second air vent port being provided on the inside of the housing of the recess at a position overlapping the other end of the lid body .

This allows the refrigerant leak detection sensor to be installed while minimizing changes to the spatial design inside the housing, such as around the bellmouth. This allows the refrigerant leak detection sensor to be positioned while minimizing deformation of the indoor unit's internal structure.

The present invention makes it possible to detect refrigerant leaks while minimizing changes to the internal structure of the housing.

FIG. 1 is a perspective view showing a configuration of an indoor unit of an air conditioner according to an embodiment of the present invention; Plan view of the indoor unit from below with the decorative panel removed 3 is a cross-sectional view taken along line III-III of FIG. A plan view of the drain pan and bell mouth of the indoor unit viewed from below. An enlarged view of the V portion of FIG. 1A is a perspective view showing the configuration of the lid body when viewed from the decorative panel side, and FIG. 1B is a perspective view showing the configuration of the lid body when viewed from the recess side.

The first invention is an indoor unit for an air conditioner, which is characterized in that it includes a blower, an indoor heat exchanger having refrigerant piping, and a bell mouth that rectifies the air drawn into the blower inside a housing, the bell mouth forms at least a part of a flow path through which the air drawn into the blower flows, a recess is provided on the upper surface of the bell mouth facing the flow path to house electrical components, and a refrigerant leak detection sensor that detects the refrigerant is housed in the recess.

This allows the refrigerant leak detection sensor to be installed while minimizing changes to the spatial design inside the housing, such as around the bellmouth. This allows the refrigerant leak detection sensor to be positioned while minimizing deformation of the indoor unit's internal structure.

The second invention is characterized in that it includes a lid that covers the recess, and the lid is provided with a vent that connects the recess to the outside of the recess.

This allows air to flow into the recess through the vent, and the refrigerant leakage detection sensor is placed in the recess and can detect refrigerant leakage even when covered by the lid. Therefore, when the indoor unit is operating, it is possible to detect refrigerant leakage while preventing airflow obstruction and abnormal noise from occurring inside the indoor unit.

In the third invention, the housing includes a drain pan that covers the indoor heat exchanger from below, and the bell mouth includes a horizontal section that is formed in a frame shape along the upper surface of the drain pan and extends substantially horizontally, and a cylindrical section that rises upward in a curved shape from the inner periphery of the horizontal section, and the recess is provided in the horizontal section.

This allows workers to easily repair and inspect the refrigerant leak detection sensor housed in the recess in the indoor unit. This improves the maintainability of the indoor unit.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing the configuration of an indoor unit 10 of an air-conditioning apparatus 1 according to an embodiment of the present invention.
The air conditioner 1 includes a refrigeration cycle formed by an indoor heat exchanger 40 housed in the indoor unit 10 and a compressor, a pressure reducing device, an outdoor heat exchanger, and the like housed in the outdoor unit, and conditions the air in the conditioned space in which the indoor unit 10 is installed by circulating a refrigerant through this refrigeration cycle. In this embodiment, R32 is used as the refrigerant for the air conditioner 1. However, the refrigerant for the air conditioner 1 is not limited to this, and various alternative fluorocarbons such as hydrocarbons and ammonia may also be used.

As shown in FIG. 1, the indoor unit 10 of the air conditioning device 1 of this embodiment is a so-called mini-cassette type indoor unit with a small external width, which is a more compact version of a ceiling-embedded indoor unit capable of blowing air in four directions. However, the indoor unit 10 is not limited to this, and may be, for example, a two-way type indoor unit or a four-way type indoor unit with a general external shape.

This indoor unit 10 is installed in the ceiling space between the ceiling of a building and a ceiling board installed below the ceiling. In the following description, the up-down direction of the indoor unit 10 and each part of the indoor unit 10 refers to the up-down direction when installed in the ceiling space.
The indoor unit 10 includes a housing 14 formed in a box shape with an open bottom. Hanging brackets 18 are attached to the outer corners of side panels 17 of the housing 14. The housing 14 is installed in a state where it is suspended from the ceiling of a building by fasteners such as hanging bolts connected to the hanging brackets 18.

A substantially rectangular decorative panel 33 is attached to the bottom surface of the housing 14 so as to cover the bottom opening of the housing 14 .
A panel suction port 34, which is an opening communicating with the inside of the housing 14, is formed in the center of the decorative panel 33, and an suction grill 35 that covers the panel suction port 34 is removably attached to the panel suction port 34. A filter 36 for removing dust and the like in the air is provided on the housing 14 side of the suction grill 35.

Outside the intake port 34 of the decorative panel 33, panel outlets 37 that send conditioned air into the room are formed at positions along each side of the decorative panel 33. Each panel outlet 37 is provided with a flap 38 that opens and closes the panel outlet 37 and changes the direction of the air blown out from the panel outlet 37.

A support shaft (not shown) is provided at both ends of each flap 38 in the longitudinal direction, and by supporting this support shaft on both ends of the panel outlet 37, each flap 38 is formed to be freely rotatable around the support shaft. A hinge is provided at approximately the center in the longitudinal direction on the back surface (surface on the housing 14 side) of each flap 38. A flap drive motor is attached to each of these hinges. Each flap 38 is independently driven to rotate by driving each hinge by the flap drive motor. This allows each flap 38 to open and close the panel outlet 37, and adjust the angle relative to the panel outlet 37.

The indoor unit 10 is provided with a number of pipe connections 19 to which refrigerant pipes are connected. The indoor unit 10 is connected to the outdoor unit of the air conditioner 1 by refrigerant pipes connected to each of the pipe connections 19. The refrigeration cycle of the air conditioner 1 is formed by connecting the indoor unit 10 and the outdoor unit by the refrigerant pipes.

An external electrical box 80 is provided on the outside of the housing 14 along one of the side panels 17. This external electrical box 80 houses electrical components such as a control board that constitutes a control circuit for controlling each part of the indoor unit 10. In other words, the external electrical box 80 functions as a housing for the electrical components.

Fig. 2 is a plan view of the indoor unit 10 viewed from below with the decorative panel 33 removed. Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2.
As shown in FIGS. 2 and 3 , a blower 20 and an indoor heat exchanger 40 are housed inside the housing 14 .
3, a fan motor 21 is attached to the underside of the top plate 15 of the housing 14, and a rotating shaft 22 extends downward from the fan motor 21 and is driven to rotate by the driving of the fan motor 21. A turbofan 23 is attached to the lower end of the rotating shaft 22, and the fan motor 21 and the turbofan 23 together constitute the blower 20.

The turbofan 23 includes a main plate 24 formed in an annular plate shape. A motor housing portion 25 having an inverted truncated cone shape that extends downward is formed in the center of the main plate 24.
The motor housing portion 25 houses the fan motor 21, and a rotating shaft 22 of the fan motor 21 extends downward and is connected to the bottom surface of the motor housing portion 25. The fan motor 21 is rotated to rotate the turbo fan 23 via the rotating shaft 22.

A shroud 26 is provided below the main plate 24, and is formed in an annular shape with an arc-shaped circumferential surface. A plurality of blade members 27 are integrally formed between the main plate 24 and the inner circumferential surface of the shroud 26 and are arranged at predetermined intervals in the circumferential direction.
A bellmouth 50 is disposed below the shroud 26. The bellmouth 50 is formed in an annular shape with its circumferential surface formed in an arc shape.

A polystyrene foam heat insulating member 16 is disposed inside the housing 14 in contact with the inner surface of a side plate 17 of the housing 14 to prevent condensation on the side plate 17 .
An indoor heat exchanger 40 , which is bent into a substantially rectangular shape in plan view, is disposed between the blower 20 and the heat insulating member 16 so as to surround the sides of the blower 20 .
The indoor heat exchanger 40 functions as a refrigerant evaporator during cooling operation, and as a refrigerant condenser during heating operation. The indoor heat exchanger 40 is a so-called fin-and-tube type heat exchanger, and is formed by joining a plurality of metal fins 44 to a copper refrigerant pipe 42. The refrigerant pipe 42 is connected to one end of the pipe connection part 19.

In the indoor unit 10 of this embodiment, when the blower 20 is driven, air in the space to be conditioned is drawn into the interior of the housing 14 through the panel intake port 34. The drawn-in air passes through a filter 36 and then through the indoor heat exchanger 40 for heat exchange, and the conditioned air is sent as wind from the panel outlet port 37 to the indoor space, which is the conditioned space in which the indoor unit 10 is installed.
The indoor heat exchanger 40 is configured to exchange heat between the indoor air drawn into the housing 14 and the refrigerant, thereby cooling the air in the air-conditioned room during cooling operation and heating the air in the room during heating operation.

A drain pan 45 is disposed below the indoor heat exchanger 40 so as to correspond to the lower surface of the indoor heat exchanger 40. The drain pan 45 is for receiving drain water generated in the indoor heat exchanger 40.
The drain pan 45 is formed in a generally rectangular plate shape so as to cover substantially the entire lower opening of the housing 14 .

The drain pan 45 is provided with multiple drain pan outlets 47. Each drain pan outlet 47 is a rectangular opening formed by the drain pan 45 and the lower end of each side plate 17 of the housing 14, and each drain pan outlet 47 is provided to extend along each side plate 17.

The lower surface side of the drain pan 45 is covered by the decorative panel 33. The drain pan outlets 47 are provided at positions overlapping with the panel outlets 37, respectively.
The drain pan 45 is provided with a drain pump 48 for discharging drain water.

Next, the bell mouth 50 will be described in detail.
The bellmouth 50 is a member that rectifies the air drawn into the blower 20, and is formed in a cylindrical shape through which air passes. The bellmouth 50 is provided with a horizontal section 52 that is formed in a frame shape so as to fit along the upper surface of the drain pan 45 and extends substantially horizontally, and a cylindrical section 54 that rises upward in a curved shape from the inner periphery of the horizontal section 52.
In the bellmouth 50 , the horizontal portion 52 forms a lower end portion that is enlarged in diameter relative to the cylindrical portion 54 .
The upper end of the cylindrical portion 54 is disposed inside the shroud 26 .

The bellmouth 50 functions as a member that straightens the air that flows in from the panel suction port 34 and guides it to the blower 20. In other words, the bellmouth 50 forms part of the flow path inside the housing 14 through which the air sucked in from the suction grille 35 flows as it heads toward the blower 20.
In the bellmouth 50, the horizontal section 52 is located on the air inflow side, and the cylindrical section 54 is located on the air outflow side. Hereinafter, of the inner surfaces of the bellmouth 50, the surface located on the horizontal section 52 is referred to as the horizontal section upper surface 53 ( FIG. 5 ), and the surface located on the cylindrical section 54 is referred to as the tube section upper surface 55 ( FIG. 5 ).
The inner surface of the bellmouth 50 is the upper surface of the bellmouth 50 that faces the flow path through which the air sucked in from the suction grill 35 flows as it heads toward the blower 20.

As shown in FIG. 3, the horizontal portion 52 of the bellmouth 50 has a recess 56 recessed from the panel intake 34 side toward the blower 20 side. This recess 56 is located in the space surrounded by the indoor heat exchanger 40, the drain pan 45, and the bellmouth 50, and the recess 56 is recessed in the vertical direction of the housing 14 to a height that does not contact the turbofan 23.

FIG. 4 is a plan view of the drain pan 45 and the bell mouth 50 of the indoor unit 10 viewed from below.
As shown in FIG. 4, the recess 56 extends along the circumferential direction of the horizontal portion 52 in a plan view.
The recess 56 in this embodiment extends from approximately the center of one side plate 17 to approximately the center of the side plate 17 adjacent to that side plate 17. Therefore, the recess 56 is formed in a substantially L-shape in plan view.
Predetermined electrical components are housed in the internal space S of the recess 56. That is, the recess 56 functions as an electrical component box. The recess 56 has a height such that the electrical components housed in the internal space S do not excessively protrude from the internal space S to the outside.

As described above, some of the electrical components of the indoor unit 10 are housed in the external electrical box 80. This reduces the number of electrical components housed in the recess 56, making it possible to reduce the internal space S of the recess 56. This reduces the space required to house the electrical components around the bellmouth 50, making it possible to reduce the size of the indoor unit 10. Furthermore, the recess 56 is prevented from approaching the turbofan 23, maintaining the air blowing efficiency of the blower 20.
In the present embodiment, the recess 56 accommodates an electrostatic atomizer 60 and a refrigerant leakage detection sensor 65 .

The electrostatic atomizer 60 is a device that suppresses the activity of viruses, mold, allergy-causing substances, bacteria, etc. in the air and deodorizes the air by generating a mist containing charged fine particle water. The charged fine particle water contains active ingredients such as radicals that exhibit disinfecting and deodorizing effects.
The electrostatic atomizer 60 includes a box-shaped case 62. The case 62 is made of a flame-retardant material, and in this embodiment, a resin material having a rating of V0 or higher according to the UL94 standard is used.
The case 62 contains a discharge unit that discharges electricity to the supplied moisture to generate a mist containing charged fine water particles, a power supply circuit that generates a high voltage to be applied to the discharge unit, and the like.

Fig. 5 is an enlarged view of a portion V in Fig. 4. In Fig. 5, the flow of air is indicated by arrows.
5, an intake section 64 that introduces air into the inside of the case 62 is provided on the upper surface of the case 62. The intake section 64 is formed in a tubular shape extending upward, and is connected to an opening 57 provided on the top surface of the recess 56.
One end of the case 62 is provided with a blowing section 63 that discharges air drawn into the case 62. The blowing section 63 of the electrostatic atomizer 60 is formed in a tube shape that extends outward from one end of the case 62. The end of the blowing section 63 is connected to an opening 58 provided on the side of the recess 56. This opening 58 communicates with the space surrounded by the housing 14 and the indoor heat exchanger 40 via the drain pan 45.

The electrostatic atomizer 60 takes in air through the suction section 64 and blows the air together with mist from the blowing section 63. The blown air is blown out into the indoor space from each panel outlet 37 together with the air blown by the blower 20.

The refrigerant leakage detection sensor 65 is disposed in the internal space S of the recess 56 at a position adjacent to the electrostatic atomization device 60 .
The refrigerant leakage detection sensor 65 of the present embodiment is a gas sensor that detects the concentration of the refrigerant.
The refrigerant leakage detection sensor 65 includes a sensor body 66 and a sensor case 67 that covers the sensor body 66. The sensor case 67 is formed in a basket shape with a plurality of openings, which allows outside air to be taken into the sensor case 67, enabling the sensor body 66 to detect the refrigerant.

In this way, by providing the recess 56 and storing the electrical components in the internal space S, there is no need to provide space between the panel intake 34 or drain pan 45 and the bell mouth 50 to place the electrical components. This makes it possible to reduce the size of the indoor unit 10.

6A and 6B are diagrams showing the configuration of the cover 70, where FIG. 6A is a perspective view seen from the decorative panel 33 side, and FIG. 6B is a perspective view seen from the recessed portion 56 side.
The recess 56 is covered by a lid 70. The lid 70 is an L-shaped plate-like member that has substantially the same shape as the recess 56 in a plan view.
6, the lid body 70 is provided with a plurality of screw holes 72. The lid body 70 is fixed to the bell mouth 50 by screwing each screw member 74 inserted into each of the screw holes 72 into the bell mouth 50.
When attached to the bell mouth 50, the lid 70 has a lid upper surface 75 which is a flat surface located on the decorative panel 33 side, and a lid back surface 76 which is a flat surface located on the recessed portion 56 side. As shown in Fig. 6(A) , the lid upper surface 75 is formed to be a smooth surface with few irregularities.

The end 71 of the lid 70 located on the inside surface side of the bell mouth 50 has an inclined portion 77 over almost the entirety. The inclined portion 77 is a flat plate with a gently sloping shape from the lid top surface 75 side toward the lid back surface 76 side. The other end 73 of the end 71 of the inclined portion 77 is curved to fit along the inside surface of the bell mouth 50. In addition, the inclined portion upper surface 78, which is the surface of the inclined portion 77 located on the lid top surface side, is formed in a curved shape that is convex toward the lid top surface 75 side. Therefore, the inclined portion upper surface 78 is a gently sloping surface.

The cover 70 is provided with a plurality of vent holes 79 which are through holes. These vent holes 79 are provided close together in a position that overlaps with the refrigerant leakage detection sensor 65 when the cover 70 is attached to the bell mouth 50.
This allows air to flow into the internal space S of the recess 56 through these ventilation holes 79 .

Next, the operation of this embodiment will be described.
When the air conditioning unit 1 is operating, the compressor of the outdoor unit is driven, and the compressor compresses the refrigerant sealed inside the refrigeration cycle consisting of various pressure reducing devices, outdoor heat exchangers, etc., expansion valves, switching valves, etc., and various refrigerant piping, etc., and sends the refrigerant to the indoor heat exchanger 40 via each refrigerant piping.
In the indoor unit 10 , the blower 20 is driven, and air within the indoor space is introduced into the indoor unit 10 through the suction grille 35 and the filter 36 .
The air introduced into the indoor unit 10 is heat exchanged in the indoor heat exchanger 40 with the refrigerant that has flowed into the indoor heat exchanger 40, and then the air direction is adjusted by the flap 38 and the air is blown out into the indoor space through the air outlet 37. In this way, the air conditioning device 1 conditions the air in the indoor space.
The refrigerant that has exchanged heat in the indoor heat exchanger 40 flows through a pipe into the expansion valve, and then flows through another pipe into the outdoor heat exchanger.

As described above, in the indoor unit 10 of this embodiment, a flow path is formed inside the housing 14 through which air in the conditioned space that is sucked in from the panel intake port 34 flows when the blower 20 is driven. The bell mouth 50 forms part of this flow path, and the sucked air passes through the inside of this bell mouth 50 and is directed toward the blower 20 while being straightened. At this time, part of the sucked air flows along the inner surface of the bell mouth 50, i.e., the horizontal portion upper surface 53 and the cylindrical portion upper surface 55, as shown in FIG. 5.

A recess 56 is provided in a portion of the horizontal portion upper surface 53, and the recess 56 is closed by a lid 70. This prevents air from entering the internal space S of the recess 56, even though the recess 56 is provided, and prevents air flow from being obstructed inside the indoor unit 10 and abnormal noise from being generated when the indoor unit 10 is in operation.

As described above, R32 is used as the refrigerant in the air conditioning device 1 including the indoor unit 10. This R32 is slightly flammable, and if R32 leaks, it is necessary to detect the leak before the refrigerant concentration in the indoor space or inside the indoor unit 10 reaches the lower flammability limit (LFL).

In this embodiment, the indoor unit 10 is provided with a refrigerant leakage detection sensor 65. This refrigerant leakage detection sensor 65 performs sensing to detect whether or not a refrigerant leak is occurring in the indoor unit 10.

The refrigerant leak detection sensor 65 is also housed in the recess 56. This allows the refrigerant leak detection sensor 65 to be installed without expanding the space provided around the bell mouth 50, panel suction port 34, drain pan 45, etc. This allows the refrigerant leak detection sensor 65 to be installed while minimizing changes to the internal structure of the indoor unit 10.

As described above, the lid 70 is provided with multiple vents 79, which are through holes. When the blower 20 is driven, air in the conditioned space is sucked in through the panel intake port 34 and flows along the top surface 75 of the lid, and flows from the vents 79 into the internal space S of the recess 56. The air that has flowed in convects in the internal space S, and then flows out of the recess 56 through the vents 79.

As a result, the refrigerant leakage detection sensor 65 is disposed in the recess 56 and can detect leakage of the refrigerant even when covered by the lid 70 .
In this embodiment, air flows into and out of the recess 56 through the openings 57 and 58 .
This allows air to flow into the internal space S of the recess 56 through these ventilation holes 79 .

As described above, the recess 56 is provided in the horizontal portion 52 of the bellmouth 50 .
This allows an operator to easily repair and inspect the refrigerant leakage detection sensor 65 housed in the recess 56 by removing the suction grille 35 and the filter 36. This improves the ease of maintenance of the indoor unit 10.

Furthermore, because R32 has a higher density than air, if the R32 leaks, a large amount of it will accumulate below the indoor unit 10. In this embodiment, the recess 56 is provided in the horizontal portion 52 of the bellmouth 50, i.e., in a location located below the indoor heat exchanger 40.
This allows the refrigerant leakage detection sensor 65 to detect R32 even if the amount of leakage is small, so the refrigerant leakage detection sensor 65 can more reliably detect refrigerant leakage.

As described above, according to this embodiment, the indoor unit 10 includes, inside the housing 14, the blower 20, the indoor heat exchanger 40, and a bell mouth 50 that rectifies the air drawn into the blower 20. The bell mouth 50 forms at least a part of the flow path through which the air drawn into the blower 20 flows, and a recess 56 is provided on the horizontal upper surface 53 of the bell mouth 50 that faces the flow path, in which electrical components are housed. The recess 56 is configured to house a refrigerant leak detection sensor 65 that detects the refrigerant.

This allows the refrigerant leak detection sensor 65 to be installed without expanding the space provided around the bell mouth 50, panel suction port 34, drain pan 45, etc. Therefore, the refrigerant leak detection sensor 65 can be placed while suppressing deformation of the internal structure of the indoor unit 10.

In addition, according to this embodiment, a lid 70 is provided to cover the recess 56. The lid 70 is configured to have an air vent 79 that connects the internal space S of the recess 56 to the outside of the recess 56.

This allows air to flow into the internal space S of the recess 56 through these vents 79, and the refrigerant leakage detection sensor 65 can detect refrigerant leakage even when it is placed in the recess 56 and covered by the lid 70. Therefore, when the indoor unit 10 is operating, it is possible to detect refrigerant leakage while preventing the air flow inside the indoor unit 10 from being obstructed or abnormal noise from being generated.

Furthermore, according to this embodiment, the housing 14 is provided with a drain pan 45 that covers the indoor heat exchanger 40 from below, and the bell mouth 50 is provided with a horizontal portion 52 that is formed in a frame shape so as to fit along the upper surface of the drain pan and extends approximately horizontally, and a cylindrical portion 54 that rises upward in a curved shape from the inner periphery of the horizontal portion 52, and the recess 56 is provided in the horizontal portion 52.
According to this, in the indoor unit 10, by removing the intake grille 35 and the filter 36, a worker can easily repair and inspect the electrical components housed in the recess 56. This makes it possible to improve the maintainability of the indoor unit 10.

The above-described embodiment is an example of one aspect of the present invention, and can be modified and applied as desired without departing from the spirit and scope of the present invention.

As described above, the indoor unit of the air conditioner according to the present invention can be suitably used as an indoor unit of an air conditioner that can detect refrigerant leaks while stabilizing the air flow inside the housing.

REFERENCE SIGNS LIST 1 Air conditioner 10 Indoor unit 14 Housing 20 Blower 40 Indoor heat exchanger 45 Drain pan 50 Bell mouth 52 Horizontal portion 53 Upper surface of horizontal portion (upper surface)
54 Cylindrical portion 55 Cylindrical portion upper surface (upper surface)
56 Recess 65 Refrigerant leakage detection sensor 70 Lid 75 Lid upper surface (upper surface)
78 Upper surface of inclined part (upper surface)
79 Ventilation port 80 External electrical box (storage section)
S. Interior space

Claims (3)

The housing includes a blower, an indoor heat exchanger having a refrigerant pipe, and a bell mouth that rectifies the air drawn into the blower.
The housing includes a drain pan that covers the indoor heat exchanger from below,
The bell mouth forms at least a part of a flow path through which air drawn into the blower flows,
The bell mouth includes a horizontal portion that is formed in a frame shape along an upper surface of the drain pan and extends substantially horizontally;
a cylindrical portion rising upward in a curved shape from an inner periphery of the horizontal portion;
Equipped with
a recess for accommodating electrical components is provided on an upper surface of the bell mouth facing the flow path,
The recess is provided in the horizontal portion.
A refrigerant leakage detection sensor that detects a refrigerant is housed in the recess,
A cover body for covering the recess is provided,
The cover is formed to extend along a circumferential direction of the horizontal portion in a plan view,
A first ventilation hole is provided at one end of the lid body, the first ventilation hole communicating the recess with the outside of the recess,
A second ventilation hole is provided on the inside of the housing of the recess at a position overlapping with the other end of the lid .
An indoor unit of an air conditioner comprising: The indoor unit for an air conditioner according to claim 1, wherein the first vent hole is disposed at a position overlapping the refrigerant leakage detection sensor when the cover body is attached to the bell mouth. The recess contains an electrostatic atomizer,
The indoor unit of an air conditioner according to claim 1 or 2, wherein the electrostatic atomizer takes in air through the second air vent.

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