Indoor unit for air conditioner

Abstract

To provide an indoor unit for an air conditioner capable of fixing a hanging metal fitting to a hanging bolt without generating deformation, etc. of a case body.SOLUTION: An indoor unit for an air conditioner includes a heat exchanger, an air blower and a case body. The case body accommodates the heat exchanger and the air blower, and is fixed to a hanging bolt provided in a space separated from an indoor side by a ceiling plate. The case body includes: a hanging metal fitting fixed to the hanging bolt; an insertion port to which the hanging metal fitting is inserted from an inner surface side of the case body to protrude the hanging metal fitting to an outer surface side of the case body; and a reinforcement part provided at least at a part of an edge of the insertion port to reinforce a portion near the insertion port.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an indoor unit of an air conditioner. [Background technology]

[0002] Indoor units of air conditioners are sometimes installed in the attic of a building. The attic is the space separated from the interior of a building by a ceiling panel and existing between the ceiling panel and the roof or floor of the building above. In such ceiling-embedded indoor units, for example, the housing of the indoor unit is placed in the attic, and a panel attached to the bottom of the housing is exposed to the room. The panel has an intake port that draws in air from the room and an outlet port that blows air into the room. The panel is also called a decorative panel or interior panel and is installed to enhance the design of the room.

[0003] The indoor unit housing is installed above the ceiling, for example, by fastening a hanging bracket to a hanging bolt installed on a beam above the ceiling. The housing has a box-like outer shell with a space surrounded by a top surface and side surfaces hanging down from the edges of the top surface. The top surface and side surfaces are formed, for example, by pressing or bending thin metal sheet.

[0004] The side surface has a socket into which a hanging hardware is inserted from the inner surface of the side surface. The hanging hardware inserted into the socket is screwed into the side surface, protrudes from the outer surface of the side surface, and is secured to a hanging bolt. The socket is formed, for example, by punching out the appropriate portion of the sheet metal when forming the side surface. When the hanging hardware screwed to the side surface is secured to the hanging bolt and the housing is attached to the ceiling of a building, the weight of the indoor unit (housing and panel) acts on the hanging hardware.

[0005] If the indoor unit is fixed to the hanging bolt with multiple hanging brackets, for example, if the balance of forces acting on each hanging bracket is disrupted and the force acts concentratedly on a specific hanging bracket, depending on the magnitude of the force, there is a risk of deformation or other problems occurring in the housing. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4226865 [Patent Document 2] Patent No. 5033535 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention was made based on this, and its purpose is to provide an indoor unit of an air conditioner that can fix a hanging bracket to a hanging bolt without causing deformation of the casing. [Means for solving the problem]

[0008] According to an embodiment, an indoor unit of an air conditioner includes a heat exchanger, a blower, and a housing. The heat exchanger exchanges heat between indoor air and a refrigerant in a building. The blower draws in indoor air and blows the air that has undergone heat exchange in the heat exchanger into the room. The housing houses the heat exchanger and the blower and is fixed to a hanging bolt provided in a space separated from the room by a ceiling panel. The housing has a hanging hardware fixed to the hanging bolt, a socket into which the hanging hardware is inserted from the inner surface of the housing and causes the hanging hardware to protrude toward the outer surface of the housing, and a reinforcing portion on at least a portion of the edge of the socket that reinforces the vicinity of the socket. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view schematically showing an indoor unit of a ceiling-mounted air conditioner according to an embodiment. [Figure 2] FIG. 2 is a plan view showing the indoor unit shown in FIG. 1 from above the ceiling of the building. [Figure 3]FIG. 2 is a perspective view schematically illustrating an example of a state in which a housing of an indoor unit according to an embodiment is fixed to a suspension bolt. [Figure 4] 4 is a perspective view schematically illustrating an example of a state in which the housing shown in FIG. 3 is fixed to a suspension bolt, viewed from a different perspective from that of FIG. 3.

[0023] FIG. [Figure 5] FIG. 2 is a perspective view showing, in outline, the shape of a receptacle for a hanging metal fitting in a housing of an indoor unit according to the embodiment. [Figure 6] 3 is a cross-sectional view showing a schematic configuration of the vicinity of the first socket, including a reinforcing portion of the housing of the indoor unit according to the embodiment, at a location indicated by arrow A2 in FIG. 2 on the side surface of the housing, viewed from the direction of the arrow. [Figure 7] FIG. 10 is a cross-sectional view showing the schematic configuration of the vicinity of the first socket, including the reinforcing portion of the housing of the indoor unit according to the first modified example of the embodiment, at a location on the side of the housing equivalent to the location indicated by arrow A2 in FIG. 2, as viewed from the direction of the arrow. [Figure 8] FIG. 10 is a cross-sectional view showing the schematic configuration of the vicinity of the first socket, including the reinforcing portion of the housing of the indoor unit according to the second modified example of the embodiment, at a location on the side of the housing equivalent to the location indicated by arrow A2 in FIG. 2, as viewed from the direction of the arrow. DETAILED DESCRIPTION OF THE INVENTION

[0010] An indoor unit of an air conditioner according to an embodiment of the present invention will be described below with reference to the drawings. The indoor unit of such an air conditioner is embedded in the ceiling of a building and is connected by piping to an outdoor unit installed, for example, on the roof of the building, to form a refrigeration cycle and condition the air in the rooms of the building.

[0011] Figures 1 and 2 each show a schematic configuration of an indoor unit of an air conditioner according to this embodiment. Figure 1 is a perspective view showing a schematic indoor unit of a ceiling-mounted air conditioner. Figure 2 is a plan view showing a schematic view of the indoor unit shown in Figure 1 from above the ceiling of a building.

[0012] 1 and 2, the indoor unit 1 of the air conditioner mainly comprises a unit body 2 that is installed above the ceiling, and a panel (hereinafter referred to as a decorative panel) 3 attached to the lower end of the unit body 2. The lower end of the unit body 2 is the end of the indoor unit 1 on the indoor side.

[0013] The unit main body 2 includes a housing 4. The housing 4 is configured in a box shape that opens to the indoor side (downward), and is suspended from a beam above the ceiling via, for example, four suspension bolts (see FIG. 3 described later).

[0014] The housing 4 has a top surface 4a and side surfaces 4b. In the illustrated example, the top surface 4a is slightly smaller than the substantially square decorative panel 3 and has a substantially octagonal planar shape with the corners of the decorative panel 3 beveled. The planar shape is defined by the outline of the top surface 4a when viewed from the vertical direction (hereinafter referred to as the up-down direction). The side surfaces 4b have eight main surfaces surrounding the periphery of the top surface 4a. Of these, the first, third, fifth, and seventh surfaces 41b, 43b, 45b, and 47b are surfaces that extend along the four sides of the decorative panel 3, and the second, fourth, sixth, and eighth surfaces 42b, 44b, 46b, and 48b are surfaces that extend along the sides of the decorative panel 3 beveled at the corners. The inner surfaces of the top surface portion 4a and the side surface portions 4b (first to eighth surface portions 41b to 48b) are covered with a heat insulating material made of, for example, polystyrene foam.

[0015] Various elements required for the refrigeration cycle are housed inside the housing 4. Fig. 2 shows an example in which a blower 10 and a heat exchanger 11 are housed.

[0016] The blower 10 draws in air from the space to be air-conditioned, i.e., the room, and blows the air into the room after heat exchange in the heat exchanger 11. A turbofan (centrifugal fan) is used as the blower 10, which draws in air in the axial direction and blows it out in the circumferential direction. The blower 10 has, for example, a fan drive unit and a fan unit. The fan drive unit is a motor that is fixed to the top surface 4a of the housing 4 and rotates a rotating shaft. The fan unit has multiple blades arranged at a predetermined pitch in the circumferential direction, is attached concentrically to the tip of the rotating shaft, and rotates together with the rotating shaft. As the fan unit rotates, air from the room is drawn in from the lower end side of the fan unit.

[0017] The heat exchanger 11 exchanges heat between the air in the space to be air-conditioned, i.e., the room, and the refrigerant, thereby conditioning the room. The heat exchanger 11 is arranged inside the housing 4 so as to surround the blowing side of the fan 10. The heat exchanger 11 includes, for example, a plurality of heat dissipation fins and a plurality of heat transfer tubes through which the refrigerant flows. The heat dissipation fins are elongated plates extending in the vertical direction and are arranged at intervals from each other around the circumferential direction of the housing 4. The heat transfer tubes are arranged at intervals from each other in the vertical and horizontal directions and are connected in series to form a plurality of flow paths. Furthermore, the heat transfer tubes are thermally connected to the heat dissipation fins by passing through the heat dissipation fins.

[0018] The refrigerant pipe connected to the heat exchanger 11 is arranged in the space between the fourth surface 44b of the side surface 4b of the housing 4 and the heat exchanger 11, and is connected to a pair of connection ports 13a, 13b. The connection ports 13a, 13b protrude from a recessed portion of the fourth surface 44b to the outside of the housing 4, and are connected to an outdoor unit of the air conditioner (not shown) via a liquid pipe and a gas pipe (neither of which are shown).

[0019] In addition to the blower 10 and the heat exchanger 11, the housing 4 also contains, for example, a drain pan 14 (see FIG. 3 described later) that receives condensation water (drain water) generated by the heat exchange action of the heat exchanger 11, a drain pump (not shown) that drains the drain water received in the drain pan 14, and the like. The drain pan 14 is configured, for example, in a frame shape that corresponds to the area in which the heat exchanger 11 is disposed, and is disposed below the heat exchanger 11. The drain water received in the drain pan 14 is drained through a drain hose (not shown) that is connected to the drain outlet 12. The drain pump is disposed near the drain outlet 12.

[0020] The decorative panel 3 is disposed along a ceiling board (not shown) and covers the opening at the lower end of the housing 4 from the inside of the room. As shown in Fig. 1, the decorative panel 3 includes a grill (hereinafter referred to as an intake grill) 31 and a frame 32.

[0021] Intake grille 31 is located in the center of decorative panel 3, rotatably supported by frame body 32, and shields an intake port (work opening 35, described later) that draws indoor air into housing 4. Intake grille 31 has a square outer frame portion 31a and a lattice portion 31b surrounded by outer frame portion 31a. Lattice portion 31b is located directly below blower 10 and has a removable filter (not shown).

[0022] Frame body 32 is configured in the shape of, for example, a square frame that surrounds intake grille 31. Frame body 32 has first to fourth sides 33a, 33b, 33c, and 33d and four corners 34a, 34b, 34c, and 34d.

[0023] The first to fourth sides 33a, 33b, 33c, and 33d extend along the outer periphery of the outer frame 31a of the intake grille 31. The corners 34a, 34b, 34c, and 34d are located at the four corners of the decorative panel 3 and integrally connect the first to fourth sides 33a, 33b, 33c, and 33d that are adjacent in the circumferential direction of the frame body 32. A rectangular area surrounded by the inner peripheries of the first to fourth sides 33a, 33b, 33c, and 33d defines an access opening 35. The access opening 35 exposes the interior of the housing 4 to the room and allows for easy cleaning and maintenance of the blower 10 and heat exchanger 11, for example. The access opening 35 also serves as an intake port that draws indoor air into the housing 4.

[0024] The decorative panel 3 is detachably connected to the housing 4 at four corners 34a, 34b, 34c, and 34d of the frame 32. As a result, the lower end of the unit main body 2 is covered with the decorative panel 3.

[0025] The decorative panel 3 has four air outlets 37 that blow out the air that has undergone heat exchange in the heat exchanger 11 into the room. The air outlets 37 are formed on the first to fourth side portions 33a, 33b, 33c, and 33d of the frame body 32.

[0026] Four louvers 36 are rotatably supported on the frame 32 of the decorative panel 3. The louvers 36 are elements that change the blowing direction of air blown into the room from the air outlet 37, and are formed in the shape of flat, elongated plates. The louvers 36 are rotatable between a closed position that closes the air outlet 37 and an open position that tilts to open the air outlet 37. When the louvers 36 are rotated to the closed position, they are horizontal and completely cover the first to fourth sides 33a, 33b, 33c, and 33d of the frame 32.

[0027] For example, one side of the outer frame portion 31a of the intake grille 31 of the decorative panel 3 is selectively rotatably connected to any one of the first to fourth sides 33a, 33b, 33c, and 33d of the frame body 32. Therefore, the intake grille 31 is rotatable between a first position that closes the access opening 35 and a second position that opens the access opening 35. Furthermore, when the intake grille 31 is rotated to the second position, the intake grille 31 can be removed from the frame body 32.

[0028] The indoor unit 1 having such a configuration is embedded in the ceiling of a building as described above. In this case, the unit main body 2 is installed above the ceiling with the housing 4 fixed to hanging bolts provided on beams or the like above the ceiling. In this embodiment, as an example, the housing 4 is fixed to four hanging bolts.

[0029] FIG. 3 is a perspective view schematically illustrating an example of a state in which the housing 4 is fixed to the hanging bolt 90. FIG. 4 is a perspective view schematically illustrating an example of a state in which the housing 4 shown in FIG. 3 is fixed to the hanging bolt 90, from a different perspective than that of FIG. 3. As shown in FIGS. 1 to 4, the housing 4 has a hanging hardware 51 fixed to the hanging bolt 90 and a socket 52 into which the hanging hardware 51 is inserted. One hanging hardware 51 and one socket 52 are disposed on each of the four surfaces 42b, 44b, 46b, and 48b of the side surface 4b of the housing 4. Of these, FIGS. 3 and 4 show a state in which the housing 4 is fixed to the hanging bolt 90 by the hanging hardware 51 inserted into the socket 52 disposed on the eighth surface 48b shown in FIGS. 1 and 2. The following explanation will be given using the configuration of the hanging fittings 51 and the sockets 52 shown in Figures 3 and 4 as an example, but the hanging fittings 51 and the sockets 52 arranged on the remaining three surface portions 42b, 44b, and 46b also conform to the configuration shown in Figures 3 and 4, and the same explanation can be applied.

[0030] Hanging hardware 51 is a thin metal part having multiple bends, notches, screw holes, etc. In the illustrated example, hanging hardware 51 is primarily composed of three pieces 51a, 51b, and 51c. First piece 51a and second piece 51b are connected via third piece 51c and stand upright in the same direction relative to third piece 51c. When hanging hardware 51 is inserted into socket 52, first piece 51a and second piece 51b form surfaces that are approximately parallel to the horizontal direction, and third piece 51c forms a surface that is approximately parallel to the vertical direction.

[0031] The first piece 51a is a portion that is fixed to the hanging bolt 90. In the illustrated example, the first piece 51a is sandwiched between two nuts 91a, 91b provided on the hanging bolt 90 and connected to the hanging bolt 90. In this way, the hanging hardware 51 is fixed to the hanging bolt 90.

[0032] The second piece 51b is a portion to which the drain pan 14 and the decorative panel 3 are fixed. In this embodiment, the drain pan 14 is fastened to the second piece 51b with a screw 81, and the decorative panel 3 is fastened with a screw 82. This fastens and fixes the drain pan 14 and the decorative panel 3 to the second piece 51b. For example, the second piece 51b fastens and fixes the drain pan 14 and the decorative panel 3 via brackets or the like provided on the drain pan 14 and the decorative panel 3, respectively.

[0033] The third piece 51c is a portion that is fixed to the eighth surface 48b of the side surface 4b of the housing 4. In the illustrated example, the third piece 51c is fastened to the eighth surface 48b with a screw 83. For example, the screw 83 is inserted into a screw insertion hole 49 (described later) in the eighth surface 48b and fastened to a screw hole in the third piece 51c. As a result, the hanging metal fitting 51 inserted into the insertion port 52 in the eighth surface 48b is fixed to the eighth surface 48b.

[0034] Fig. 5 is a perspective view that schematically illustrates the configuration of receptacle 52. Fig. 5 shows the opening of receptacle 52 with no hanging hardware 51 inserted. In the state shown in Fig. 5, the hanging hardware 51 and hanging bolt 90 are omitted for convenience from the state shown in Fig. 4 in which housing 4 is fixed to hanging bolt 90. Receptacle 52 is a through-hole that penetrates eighth surface 48b, and hanging hardware 51 is inserted from the inner surface side of housing 4, causing hanging hardware 51 to protrude toward outer surface 48s of housing 4.

[0035] As shown in Figure 5, the socket 52 has a first socket 52a into which the first piece 51a of the hanging fitting 51 is inserted and protrudes, and a second socket 52b into which the second piece 51b of the hanging fitting 51 is inserted and protrudes.

[0036] The first insertion opening 52a has an oval opening when viewed in the direction in which the inserted first piece 51a protrudes, i.e., perpendicular to the eighth surface 48b. That is, the first insertion opening 52a has an upper edge 61a and a lower edge 62a that are parallel to each other, and the edges 63a, 64a at both ends connecting them are curved. The height and width of the first insertion opening 52a are appropriately adjusted depending on the thickness and shape of the first piece 51a so that the first piece 51a can be inserted smoothly. The height of the first insertion opening 52a is the distance between the upper edge 61a and the lower edge 62a of the first insertion opening 52a. The width of the first insertion opening 52a is the maximum distance between the curved edges (hereinafter referred to as edges) 63a, 64a connecting the upper edge 61a and the lower edge 62a of the first insertion opening 52a.

[0037] The eighth surface portion 48b has a recess 53 that is continuous with the first insertion port 52a. The recess 53 is a portion that is continuous with a portion of the edge of the first insertion port 52a and that is recessed from other portions of the outer surface 48s of the eighth surface portion 48b. In the illustrated example, the recess 53 is continuous with the upper edge 61a of the first insertion port 52a and recesses the outer surface 48s of the eighth surface portion 48b to correspond to the thickness of the third piece 51c that is continuous with the first piece 51a that is inserted into the first insertion port 52a. In other words, the recess 53 is continuous with the upper edge 61a of the first insertion port 52a, on which the reinforcing portion 54, described below, is provided. As a result, when first piece 51a of hanging fitting 51 is inserted into first insertion port 52a, third piece 51c comes into contact with recess 53, and the posture of hanging fitting 51 is supported by recess 53.

[0038] The second insertion opening 52b has an oval opening when viewed in the direction in which the inserted second piece 51b protrudes, i.e., perpendicular to the eighth surface 48b, and a continuous opening that exposes a portion of the continuous portion between the second piece 51b and the third piece 51c. That is, the second insertion opening 52b has an upper edge 61b and a lower edge 62b that are parallel to each other, and the edges 63b and 64b connecting them are curved. The height and width of the second insertion opening 52b are appropriately adjusted depending on the thickness and shape of the second piece 51b so that the second piece 51b can be inserted smoothly. The height of the second insertion opening 52b is the distance between the upper edge 61b and the lower edge 62b of the second insertion opening 52b. The width of second insertion opening 52b is the maximum distance between curved edges (hereinafter referred to as end edges) 63b, 64b connecting upper edge 61b and lower edge 62b of second insertion opening 52b.

[0039] In this embodiment, the housing 4 has a reinforcing portion 54 at a portion of the edge of the first receptacle 52a that reinforces the vicinity of the first receptacle 52a, i.e., the side surface 4b where the first receptacle 52a is located (the eighth surface 48b in the illustrated example). In other words, the reinforcing portion 54 suppresses deformation of the first receptacle 52a and suppresses deformation of the side surface 4b where the first receptacle 52a is located that begins at the first receptacle 52a. The reinforcing portion 54 may have any shape as long as it improves the strength of the side surface 4b where the first receptacle 52a is located.

[0040] FIG. 6 shows an example of the configuration of the reinforcing portion 54. FIG. 6 is a cross-sectional view of the first reinforcing port 52a and its vicinity, taken along the arrow A2 in FIG. 2 on the eighth surface 48b of the side surface 4b of the housing 4, showing a schematic configuration of the reinforcing portion 54. In the illustrated example, the reinforcing portion 54 is provided on the lower edge 62a and both end edges 63a, 64a of the first reinforcing port 52a to enhance the strength of the eighth surface 48b. The strength here refers to the strength required to resist a deforming force acting on the eighth surface 48b when the hanging bracket 51 is fixed to the hanging bolt 90 and the unit body 2 is installed above the ceiling. The deforming force acts, for example, on the area around the screw 83 that fixes the third piece 51c to the eighth surface 48b toward the outside and inside of the housing 4, twisting (shearing) the area. Therefore, when a deforming force is applied to the eighth surface 48b of the housing 4, the reinforcing portion 54 prevents the eighth surface 48b from being deformed.

[0041] In the example shown in FIGS. 4 to 6, the reinforcing portion 54 is an upright piece that stands on the outer surface 48s side of the eighth surface 48b relative to the eighth surface 48b. For example, the reinforcing portion 54 is configured as an upright piece formed by cutting and raising the lower edge 62a and both end edges 63a, 64a of the first insertion opening 52a. In this case, the reinforcing portion 54 has a straight piece 54a that continues linearly along the lower edge 62a of the first insertion opening 52a, and curved pieces 54b, 54c that curve and continue at both ends of the straight piece 54a along both end edges 63a, 64a of the first insertion opening 52a. The upright height of the reinforcing portion 54 (straight piece 54a and curved pieces 54b, 54c) relative to the eighth surface 48b is, for example, equal to or greater than the thickness of the hanging hardware 51, more specifically, the thickness of the first piece 51a.

[0042] As described above, the reinforcing portion may have any shape as long as it improves the strength of the side surface portion 4b where the first insertion port 52a is located, and is not limited to the shape (standing piece) shown in FIGS. 4 to 6. For example, it may have shapes related to modified examples such as those shown in FIGS. 7 and 8. These modified examples of the reinforcing portion will be described below. In these modified examples, the configuration of the indoor unit other than the reinforcing portion is the same as that of the indoor unit 1 according to the above-described embodiment, and a configuration equivalent to the configuration shown in FIGS. 1 to 5 can be applied. Therefore, the configuration of the indoor unit other than the reinforcing portion in the modified examples will not be described again, and FIGS. 1 to 5 will be referred to as appropriate.

[0043] FIG. 7 shows a first modified example of reinforcement portion 54, i.e., reinforcement portion 55. FIG. 7 is a cross-sectional view of a portion of first receptacle 52a and its vicinity, including reinforcement portion 55, taken along the arrow A2 in FIG. 2, at the same location on eighth surface 48b of side surface 4b of housing 4. In the illustrated example, reinforcement portion 55 is configured as a bent piece that stands upright toward outer surface 48s of eighth surface 48b and is folded back to contact outer surface 48s of eighth surface 48b. For example, reinforcement portion 55 is formed by hemming a lower edge 62a and both end edges 63a, 64a of first receptacle 52a, i.e., folding back 180° and flattening the bent piece.

[0044] FIG. 8 shows a second modified example of the reinforcing portion 54, i.e., a reinforcing portion 56. FIG. 8 is a cross-sectional view of the first insertion port 52a and its vicinity, taken along the arrow A2 in FIG. 2, at a location on the eighth surface 48b of the side surface 4b of the housing 4. In the illustrated example, the reinforcing portion 56 is configured as a reinforcing piece that is separate from the eighth surface 48b, i.e., the housing 4. For example, the reinforcing portion 56 is a reinforcing piece having a thickness equal to or greater than the thickness of the hanging hardware 51, more specifically, the thickness of the first piece 51a, for example, approximately the same thickness. The reinforcing portion 56 is attached to the outer surface 48s by, for example, spot welding along a lower edge 62a and both end edges 63a and 64a, which are the peripheries of the first insertion port 52a.

[0045] As described above, according to this embodiment and its modified examples, housing 4 has reinforcing portions 54, 55, and 56 that reinforce side surface 4b (eighth surface 48b in the illustrated example) on a portion of the edge of first socket 52a where first socket 52a is located. Therefore, when hanging hardware 51 is fixed to hanging bolt 90 and unit body 2 is installed above the ceiling, even if a deforming force acts on the area around screw 83 that fixes third piece 51c to eighth surface 48b, the strength of housing 4 against the deforming force, i.e., its durability, can be improved.

[0046] When the indoor unit 1 is fixed to the hanging bolts 90 with four hanging fittings 51 as in this embodiment, even if the balance of the weight of the indoor unit 1 acting on each hanging fitting 51 becomes unbalanced and the weight acts concentratedly on a specific hanging fitting 51, deformation or damage to the housing 4 will not occur. In other words, even if a deforming force is concentrated on the side surface 4b (eighth surface 48b in the illustrated example) where the first insertion port 52a into which a specific hanging fitting 51 is inserted is located, deformation or damage to the housing 4 can be appropriately prevented.

[0047] Therefore, according to this embodiment, the unit body 2 of the indoor unit 1 can be properly installed above the ceiling by fixing the hanging bracket 51 to the hanging bolt 90 without causing deformation or the like to the unit body 2.

[0048] Although the embodiments and modifications of the present invention have been described above, these embodiments and modifications are presented by way of example only and are not intended to limit the scope of the invention. These novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims. [Explanation of symbols]

[0049] 1...air conditioner indoor unit, 2...unit body, 3...panel (decorative panel), 4...casing, 4a...top surface portion, 4b...side surface portion, 10...blower, 11...heat exchanger, 12...drain outlet, 13a, 13b...connection port, 14...drain pan, 31...grille (intake grill), 31a...outer frame portion, 31b...lattice portion, 32...frame body, 33a...first side portion, 33b...second side portion, 33c...third side portion, 33d...fourth side portion, 34a, 34b, 34c, 34d...corner portion, 35...work opening (intake port), 36...louver, 37...air outlet, 41b...first surface portion, 42b...second surface portion, 43b...third surface portion, 44b...fourth surface portion, 45b...fifth surface portion, 46b...sixth surface portion, 47b...seventh surface portion, 48b...eighth surface portion, 48s...outer surface of the eighth surface portion, 49...screw insertion hole, 51...hanging hardware, 51a...first piece portion, 51b...second piece portion, 51c...third piece portion, 52, 52a, 52b...insertion port, 53...recess portion, 54, 55, 56...reinforcement portion, 54a...straight piece, 54b, 54c...curved pieces, 61a...upper edge of first socket, 61b...upper edge of second socket, 62a...lower edge of first socket, 62b...lower edge of second socket, 63a, 64a...edge of first socket, 63b, 64b...edge of second socket, 81, 82, 83...screws, 90...hanging bolt, 91a, 91b...nuts.

Claims

1. a heat exchanger that exchanges heat between the indoor air of the building and the refrigerant; a blower that draws in air from the room and blows the air that has been heat exchanged in the heat exchanger into the room; a housing that houses the heat exchanger and the fan and is fixed to a hanging bolt provided in a space separated from the room by a ceiling board; The housing has a hanging hardware fixed to the hanging bolt, a socket into which the hanging hardware is inserted from the inner surface side of the housing and causes the hanging hardware to protrude to the outer surface side of the housing, and a reinforcing portion on at least a part of the edge of the socket that reinforces the vicinity of the socket. Air conditioner indoor unit.

2. The housing is configured in a box shape, with a space surrounded by a top surface portion and side surfaces hanging down from the edge of the top surface portion, the space being open toward the room, the side surface portion has the insertion port and the reinforcing portion, The reinforcing portion is an upright piece that is formed by cutting out a part of the side surface and standing upright from the side surface. The indoor unit of an air conditioner according to claim 1.

3. The reinforcing portion is a bent piece formed by folding back the upright piece and contacting the side surface portion. The indoor unit of an air conditioner according to claim 2.

4. The height of the upright piece from the side surface is equal to or greater than the thickness of the hanging fitting.

4. An indoor unit for an air conditioner according to claim 2 or 3.

5. The housing is configured in a box shape, with a space surrounded by a top surface portion and side surfaces hanging down from the edge of the top surface portion, the space being open toward the room, the side surface portion has the insertion port and the reinforcing portion, The reinforcing portion is a reinforcing piece that is separate from the side surface portion and is attached to the periphery of the insertion port of the side surface portion. The indoor unit of an air conditioner according to claim 1.

6. The insertion port has an oval opening with a pair of straight edges and a curved edge connecting both ends of the edges when viewed from a direction perpendicular to the side surface having the insertion port. The indoor unit of an air conditioner according to claim 2.

7. The side surface portion having the insertion port has a recess that is continuous with a part of the edge of the insertion port and is recessed in the outer surface of the side surface portion more than other parts of the outer surface. The indoor unit of an air conditioner according to claim 2.

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