Indoor unit and air conditioner

Abstract

One aspect of an indoor unit according to the present disclosure is an indoor unit for an air conditioner, the indoor unit comprising a heat exchanger, a drain pan positioned below the heat exchanger, and an inspection window member having a window part through which light is transmitted, wherein: the drain pan has a first member in which a water-receiving part is formed, and a foamed-resin second member which is positioned below the first member and is fixed to the first member; a first hole for exposing the window part to the interior of the water-receiving part is formed in the first member; a second hole for exposing the window part downward is formed in the second member; the inspection window member has a sandwiched part; and the sandwiched part is vertically sandwiched between the first member and the second member and held by the drain pan.

Description

Indoor unit and air conditioner

[0001] The present disclosure relates to an indoor unit and an air conditioner.

[0002] An indoor unit of an air conditioner provided with an inspection window in a drain pan is known (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2012-225524

[0004] In the indoor unit as described above, the inspection window is attached to the drain pan by molding a synthetic resin foam constituting the drain pan by insert molding using the inspection window as an insert member. In this case, in order to stably fix the inspection window to the synthetic resin foam, it is necessary to increase the thickness of the synthetic resin foam in the portion sandwiching the embedded inspection window, resulting in a problem that the overall thickness of the drain pan increases.

[0005] In view of the above circumstances, one object of the present disclosure is to provide an indoor unit and an air conditioner having a structure capable of suppressing an increase in the size of the drain pan.

[0006] One aspect of the indoor unit according to the present disclosure is an indoor unit of an air conditioner, including a heat exchanger, a drain pan located below the heat exchanger, and an inspection window member having a window portion that transmits light. The drain pan has a first member in which a water receiving portion is formed, and a second member made of a foamed resin located below the first member and fixed to the first member. A first hole for exposing the window portion inside the water receiving portion is formed in the first member, and a second hole for exposing the window portion downward is formed in the second member. The inspection window member has a sandwiched portion, and the sandwiched portion is sandwiched in the vertical direction by the first member and the second member and held by the drain pan.

[0007] One aspect of the air conditioner according to the present disclosure includes the above indoor unit and an outdoor unit.

[0008] According to the present disclosure, in the indoor unit of an air conditioner, an increase in the size of the drain pan can be suppressed.

[0009] This is a schematic diagram showing the general configuration of the air conditioner in Embodiment 1. This is a perspective view showing the indoor unit in Embodiment 1. This is a cross-sectional view showing the indoor unit in Embodiment 1. This is a perspective view showing the drain pan in Embodiment 1. This is a view of the drain pan in Embodiment 1 from above. This is an exploded perspective view showing the drain pan in Embodiment 1. This is a view of a part of the first member and the inspection window member in Embodiment 1 from above. This is a perspective view showing a part of the first member in Embodiment 1. This is an exploded perspective view showing a part of the first member and the inspection window member in Embodiment 1. This is a cross-sectional view showing a part of the drain pan and the inspection window member in Embodiment 1. This is a perspective view showing a part of the second member in Embodiment 1. This is a cross-sectional view showing a part of the indoor unit in Embodiment 1. This is a perspective view showing the inspection window member in Embodiment 1. This is a cross-sectional view showing the inspection window member attached to the drain pan in Embodiment 1. This is a cross-sectional view showing a part of the indoor unit in Embodiment 2.

[0010] Embodiments of this disclosure will be described below with reference to the drawings. However, the scope of this disclosure is not limited to the embodiments described below and can be modified at will within the scope of the technical concept of this disclosure. Furthermore, in the following drawings, the scale and number of components in each structure may differ from those in the actual structure in order to make the configurations easier to understand.

[0011] Furthermore, the X-axis, Y-axis, and Z-axis are shown in the drawings as appropriate. The X-axis represents one of the horizontal directions. The Y-axis represents the other of the horizontal directions. The Z-axis represents the vertical direction. In the following explanation, the horizontal direction along the X-axis will be called the "first horizontal direction X," the horizontal direction along the Y-axis will be called the "second horizontal direction Y," and the vertical direction will be called the "vertical direction Z." The first horizontal direction X, the second horizontal direction Y, and the vertical direction Z are all orthogonal to each other. In the vertical direction Z, the side in which the Z-axis arrow points (+Z side) is the upper side, and the side in the vertical direction Z opposite to the side in which the Z-axis arrow points (-Z side) is the lower side. In the following explanation, the side in the first horizontal direction X in which the X-axis arrow points (+X side) will be called the "first horizontal direction one side," and the side in the first horizontal direction X opposite to the side in which the X-axis arrow points (-X side) will be called the "first horizontal direction other side." In the second horizontal direction Y, the side to which the Y-axis arrow points (+Y side) is called the "second horizontal direction one side," and the side opposite to the side to which the Y-axis arrow points (-Y side) is called the "second horizontal direction other side." Furthermore, for a given object, the side closer to the center of the indoor unit in the second horizontal direction Y is called the "second horizontal direction inner side," and the side further from the center of the indoor unit in the second horizontal direction Y is called the "second horizontal direction outer side."

[0012] Embodiment 1. Figure 1 is a schematic diagram showing the general configuration of the air conditioner 100 in Embodiment 1. As shown in Figure 1, the air conditioner 100 comprises an outdoor unit 10, an indoor unit 20, and a refrigerant circuit section 18 connecting the outdoor unit 10 and the indoor unit 20. The outdoor unit 10 is located outdoors. The indoor unit 20 is located indoors. The outdoor unit 10 and the indoor unit 20 are connected to each other by a refrigerant circuit section 18 through which refrigerant 19 circulates.

[0013] The air conditioner 100 can adjust the temperature of the indoor air by performing heat exchange between the refrigerant 19 flowing through the refrigerant circuit 18 and the air in the room where the indoor unit 20 is located. Examples of refrigerant 19 include fluorine-based refrigerants or hydrocarbon-based refrigerants with a low global warming potential (GWP). Examples of refrigerant 19 include a single refrigerant such as R1234yf, R1234ze, R32, or R290, a mixture of two or more of these, or a mixture of one of these with another refrigerant. Examples of refrigerant 19 include a mixture containing R1132(E) or a mixture containing R1123. Furthermore, examples of refrigerant 19 include mixed refrigerants such as R516A, R445A, R444A, R454C, R444B, R454A, R455A, R457A, R459B, R452B, R454B, R447B, R447A, R446A, and R459A. In its gaseous state, the density of refrigerant 19 is greater than the density of air.

[0014] The outdoor unit 10 comprises a housing 11, a compressor 12, a heat exchanger 13, a flow control valve 14, a blower 15, a four-way valve 16, and a control unit 17. The compressor 12, heat exchanger 13, flow control valve 14, blower 15, four-way valve 16, and control unit 17 are housed inside the housing 11.

[0015] The compressor 12, heat exchanger 13, flow control valve 14, and four-way valve 16 are located inside the housing 11 and are connected by the portion of the refrigerant circuit 18 that is located inside the housing 11.

[0016] The four-way valve 16 is installed in the part of the refrigerant circuit 18 that is connected to the discharge side of the compressor 12. The four-way valve 16 can reverse the direction of the refrigerant 19 flowing through the refrigerant circuit 18 by switching a part of the path in the refrigerant circuit 18. If the path connected by the four-way valve 16 is the path shown by the solid line on the four-way valve 16 in Figure 1, the refrigerant 19 flows through the refrigerant circuit 18 in the direction shown by the solid arrow in Figure 1. On the other hand, if the path connected by the four-way valve 16 is the path shown by the dashed line on the four-way valve 16 in Figure 1, the refrigerant 19 flows through the refrigerant circuit 18 in the direction shown by the dashed arrow in Figure 1.

[0017] The indoor unit 20 comprises a housing 21, a heat exchanger 22, and a blower 23. The housing 21 houses the heat exchanger 22 and the blower 23 inside. The indoor unit 20 is capable of both cooling operation, which cools the air in the room in which the indoor unit 20 is located, and heating operation, which heats the air in the room in which the indoor unit 20 is located.

[0018] When the indoor unit 20 is operating in cooling mode, the refrigerant 19 flowing through the refrigerant circuit 18 flows in the direction indicated by the solid arrow in Figure 1. In other words, when the indoor unit 20 is operating in cooling mode, the refrigerant 19 flowing through the refrigerant circuit 18 circulates by passing through the compressor 12, the heat exchanger 13 of the outdoor unit 10, the flow control valve 14, and the heat exchanger 22 of the indoor unit 20 in that order, before returning to the compressor 12. During cooling operation, the heat exchanger 13 in the outdoor unit 10 functions as a condenser, and the heat exchanger 22 in the indoor unit 20 functions as an evaporator.

[0019] On the other hand, when the indoor unit 20 is operating in heating mode, the refrigerant 19 flowing through the refrigerant circuit 18 flows in the direction shown by the dashed line in Figure 1. In other words, when the indoor unit 20 is operating in heating mode, the refrigerant 19 flowing through the refrigerant circuit 18 circulates by passing through the compressor 12, the heat exchanger 22 of the indoor unit 20, the flow control valve 14, and the heat exchanger 13 of the outdoor unit 10 in that order, before returning to the compressor 12. During heating operation, the heat exchanger 13 in the outdoor unit 10 functions as an evaporator, and the heat exchanger 22 in the indoor unit 20 functions as a condenser.

[0020] Next, the indoor unit 20 will be described in more detail. Figure 2 is a perspective view showing the indoor unit 20. Figure 3 is a cross-sectional view showing the indoor unit 20. As shown in Figures 2 and 3, in Embodiment 1, the indoor unit 20 is an indoor unit that is mounted on the ceiling C. More specifically, the indoor unit 20 is a ceiling-embedded indoor unit that is installed embedded in the ceiling C. As shown in Figure 3, the ceiling C is a double ceiling having a ceiling slab (not shown) and a ceiling panel W arranged at a distance below the ceiling slab. The ceiling slab is a structure such as a slab or beam of the upper floor. The ceiling panel W is plate-shaped with its surface facing the vertical direction Z. The lower surface of the ceiling panel W faces the room. The indoor unit 20 is installed on the ceiling C with a portion embedded in the space above the ceiling CA through a through hole Wa provided in the ceiling panel W. The space above the ceiling CA is a space provided between the ceiling slab (not shown) and the ceiling panel W in the vertical direction Z. The through-hole Wa penetrates the ceiling panel W in the vertical direction Z.

[0021] In Embodiment 1, the blower 23 housed within the casing 21 of the indoor unit 20 is a cross-flow fan. The blower 23 has an impeller 23a that rotates around a rotation axis R extending in the second horizontal direction Y. The rotation axis R is a virtual axis.

[0022] Although not shown in the diagram, in Embodiment 1, the heat exchanger 22 of the indoor unit 20 extends in the second horizontal direction Y. In Embodiment 1, the heat exchanger 22 of the indoor unit 20 has a first heat exchange section 22a and a second heat exchange section 22b. The first heat exchange section 22a is located on the other side (-X side) of the blower 23 in the first horizontal direction. The first heat exchange section 22a extends in a direction that is located on the other side of the first horizontal direction as it moves upward when viewed in the second horizontal direction Y. The second heat exchange section 22b is located on one side (+X side) of the first heat exchange section 22a in the first horizontal direction. The second heat exchange section 22b is located on one side of the blower 23 in the first horizontal direction. The second heat exchange section 22b extends in a direction that is located on one side of the first horizontal direction as it moves upward when viewed in the second horizontal direction Y.

[0023] The upper portion of the first heat exchange section 22a and the upper portion of the second heat exchange section 22b are positioned with the impeller 23a of the blower 23 sandwiched between them in the first horizontal direction X. The lower end of the first heat exchange section 22a and the lower end of the second heat exchange section 22b are located below the impeller 23a of the blower 23 and are adjacent to each other in the first horizontal direction X. The lower end of the first heat exchange section 22a and the lower end of the second heat exchange section 22b are connected to each other. The first heat exchange section 22a and the second heat exchange section 22b are positioned along a V-shape that opens upward when viewed in the second horizontal direction Y.

[0024] As shown in Figure 2, in Embodiment 1, the housing 21 of the indoor unit 20 extends in the second horizontal direction Y. The dimension of the housing 21 in the second horizontal direction Y is larger than the dimension of the housing 21 in the first horizontal direction X. In the indoor unit 20 of Embodiment 1, the first horizontal direction X is the short side direction, and the second horizontal direction Y is the long side direction. As shown in Figure 3, the housing 21 of the indoor unit 20 has a housing body portion 21a fixed to the ceiling C, and a decorative panel 26 attached to the housing body portion 21a. The housing body portion 21a is fixed to a ceiling slab (not shown) via, for example, suspension bolts (not shown). The housing body portion 21a is a roughly rectangular box shape that opens downwards. The housing body portion 21a is located in the space above the ceiling CA.

[0025] The decorative panel 26 is detachably attached to the lower end of the housing body 21a. As shown in Figures 2 and 3, the decorative panel 26 is a substantially rectangular plate with its surface facing the vertical direction Z and having sides extending in the first horizontal direction X and the second horizontal direction Y. The decorative panel 26 is positioned inside the room. The outer edge of the decorative panel 26 protrudes outward from the housing body 21a when viewed in the vertical direction Z. As shown in Figure 3, the outer edge of the decorative panel 26 is in contact with the lower surface of the ceiling panel W.

[0026] The housing 21 has an intake port 20a and an outlet port 20d that open downwards. In Embodiment 1, the intake port 20a and the outlet port 20d are formed in the decorative panel 26. In Embodiment 1, there are two intake ports 20a, a first intake port 20b and a second intake port 20c, spaced apart in the first horizontal direction X. The first intake port 20b is located below the first heat exchange section 22a. The second intake port 20c is located below the second heat exchange section 22b.

[0027] The air outlet 20d is positioned at a distance from the second suction port 20c on one side in the first horizontal direction (+X side). In Embodiment 1, the air outlet 20d is positioned in the same location as the first suction port 20b and the second suction port 20c in the vertical direction Z. However, the air outlet 20d may be positioned at a different location in the vertical direction Z from the first suction port 20b and the second suction port 20c.

[0028] The housing 21 has an air passage 27 through which the airflow generated by the blower 23 flows. The air passage 27 has a first intake passage section 27a and a second intake passage section 27b through which air drawn into the impeller 23a of the blower 23 flows, and an outlet passage section 27c through which air blown out from the impeller 23a of the blower 23 flows. The first intake passage section 27a, the second intake passage section 27b, and the outlet passage section 27c are located inside the housing 21. The first intake passage section 27a extends upward from the first intake port 20b. A first heat exchange section 22a is located in the middle of the first intake passage section 27a. The second intake passage section 27b extends upward from the second intake port 20c. A second heat exchange section 22b is located in the middle of the second intake passage section 27b. The discharge channel section 27c extends from the impeller 23a of the blower 23 to one side (+X side) in the first horizontal direction and downward. The lower portion of the discharge channel section 27c is located on one side in the first horizontal direction of the second suction channel section 27b. In Embodiment 1, at least a part of the discharge channel section 27c is composed of flow path members 28a and 28b arranged within the housing body 21a. Flow path member 28a is located above flow path member 28b.

[0029] When the blower 23 is driven and the impeller 23a rotates around the rotation axis R, room air is drawn into the housing 21 from the first intake port 20b and the second intake port 20c. The air drawn into the housing 21 from the first intake port 20b flows upward through the first intake passage 27a, passes through the first heat exchange section 22a, and is drawn into the impeller 23a of the blower 23. The air drawn into the housing 21 from the second intake port 20c flows upward through the second intake passage 27b, passes through the second heat exchange section 22b, and is drawn into the impeller 23a of the blower 23. The air drawn into the impeller 23a from the first intake passage 27a and the second intake passage 27b is discharged from the impeller 23a into the discharge passage 27c. The air discharged into the discharge channel section 27c flows downward within the discharge channel section 27c and is blown out into the room from the outlet 20d. In this way, the air drawn into the housing 21 from the intake port 20a in the indoor unit 20 passes through the heat exchanger 22 to become conditioned air, then passes through the blower 23 and is blown out from the outlet 20d.

[0030] The indoor unit 20 is equipped with a drain pan 40 located below the heat exchanger 22. The drain pan 40 is a component that collects condensation water, i.e., drain water, that forms on the outer surface of the heat exchanger 22 during cooling operation. The condensation water collected by the drain pan 40 accumulates inside the drain pan 40. The condensation water accumulated inside the drain pan 40 is discharged to the outside of the indoor unit 20 by a drain pump 29.

[0031] The drain pan 40 is located below the blower 23. In Embodiment 1, the drain pan 40 is located below the first heat exchange section 22a and the second heat exchange section 22b. More specifically, the drain pan 40 is located below the lower end of the first heat exchange section 22a and the lower end of the second heat exchange section 22b. Figure 4 is a perspective view of the drain pan 40. Figure 5 is a view of the drain pan 40 from above. Figure 6 is an exploded perspective view of the drain pan 40. As shown in Figures 4 to 6, the drain pan 40 has a substantially H shape when viewed in the vertical direction Z. The drain pan 40 has a first member 50 and a second member 60. As shown in Figure 6, the first member 50 and the second member 60 have a substantially H shape when viewed in the vertical direction Z. The drain pan 40 is formed by overlapping a first member 50 and a second member 60 in the vertical direction Z and fixing them together with adhesive 80 (see Figure 14).

[0032] The first member 50 is located above the second member 60. In Embodiment 1, the first member 50 is made of resin. The resin forming the first member 50 is, for example, ABS resin. The first member 50 has a first portion 51, a second portion 52, and a third portion 53. The first portion 51 extends in the second horizontal direction Y. The second portion 52 and the third portion 53 extend in the first horizontal direction X. The second portion 52 is connected to the end of the first portion 51 on one side (+Y side) in the second horizontal direction. The second portion 52 protrudes more than the first portion 51 on both sides in the first horizontal direction X. The third portion 53 is connected to the end of the first portion 51 on the other side (-Y side) in the second horizontal direction. The third portion 53 protrudes more than the first portion 51 on both sides in the first horizontal direction X.

[0033] A water receiving portion 54 is formed in the first member 50. The water receiving portion 54 is formed by a recess that is recessed downward from the upper surface of the first member 50. The water receiving portion 54 is a portion that can receive condensation water that is generated on the outer surface of the heat exchanger 22. The received condensation water accumulates in the water receiving portion 54. The water receiving portion 54 has a first water receiving portion 54a, a second water receiving portion 54b, and a third water receiving portion 54c. The first water receiving portion 54a is formed in the first portion 51. The first water receiving portion 54a extends in the second horizontal direction Y. The second water receiving portion 54b is formed in the second portion 52. The second water receiving portion 54b is connected to the end of the first water receiving portion 54a on one side (+Y side) in the second horizontal direction. The second water receiving portion 54b extends in the first horizontal direction X. The second water receiving portion 54b protrudes on both sides in the first horizontal direction X from the first water receiving portion 54a. The third water receiving portion 54c is formed in the third portion 53. The third water receiving portion 54c is connected to the end of the first water receiving portion 54a on the other side (-Y side) in the second horizontal direction. The third water receiving portion 54c extends in the first horizontal direction X. The third water receiving portion 54c protrudes on both sides in the first horizontal direction X from the first water receiving portion 54a.

[0034] Figure 7 is a view of a part of the first member 50 and the inspection window member 70 from above. Figure 8 is a perspective view showing a part of the first member 50. Figure 9 is an exploded perspective view showing a part of the first member 50 and the inspection window member 70.

[0035] As shown in Figure 7, the portion of the second water receiving section 54b located on one side (+X side) in the first horizontal direction relative to the first water receiving section 54a is the inspection section 54d. The inspection section 54d is the portion of the water receiving section 54 that is inspected via an inspection window member 70, which will be described later. The bottom surface of the inspection section 54d is located below the portion of the bottom surface of the second water receiving section 54b other than the bottom surface of the inspection section 54d. The bottom surface of the inspection section 54d is the lower surface of the inner surface of the inspection section 54d. The bottom surface of the inspection section 54d faces upward. For example, the bottom surface of the inspection section 54d is located at the lowest point of the bottom surface of the water receiving section 54.

[0036] The inspection portion 54d is formed by a bottom portion 52a and a side wall portion 52b extending upward from the bottom portion 52a. The upper surface of the bottom portion 52a forms the bottom surface of the inspection portion 54d. In Embodiment 1, the bottom portion 52a is plate-shaped with its surface facing the vertical direction Z. The side wall portion 52b protrudes upward from the outer edge of the bottom portion 52a. The side wall portion 52b has a substantially U-shape, opening to the other side in the first horizontal direction (-X side) when viewed in the vertical direction Z.

[0037] A counter portion 55 is formed at the bottom 52a of the inspected portion 54d, facing the suction port 29a of the drain pump 29 (see Figure 12). The counter portion 55 is located below the suction port 29a. In Embodiment 1, the counter portion 55 is formed on the first horizontal side (+X side) of the bottom portion 52a. As shown in Figure 8, the counter portion 55 is recessed downward from the upper surface of the bottom portion 52a. The counter portion 55 is circular in shape when viewed in the vertical direction Z. As shown in Figure 9, the counter portion 55 protrudes downward from the lower surface of the bottom portion 52a. The counter portion 55 is a recess with a bottom surface that opens upward and does not open downward.

[0038] A discharge pipe portion 57 is formed on the lower surface of the bottom 52a of the inspected portion 54d, projecting downward (towards the -Z direction). The discharge pipe portion 57 is cylindrical, opening on both sides in the vertical direction Z. The inside of the discharge pipe portion 57 forms a discharge hole 57a in the bottom 52a of the inspected portion 54d, penetrating the bottom 52a in the vertical direction Z. The discharge hole 57a opens on both sides in the vertical direction Z. The lower opening of the discharge hole 57a is the lower opening of the discharge pipe portion 57. As shown in Figure 7, the upper opening of the discharge hole 57a opens on the upper surface of the bottom 52a. The discharge hole 57a is located to the other side in the first horizontal direction (towards the -X side) and to the inside in the second horizontal direction (towards the -Y side) of the opposing portion 55.

[0039] Figure 10 is a cross-sectional view showing a part of the drain pan 40 and the inspection window member 70. As shown in Figure 10, the lower opening of the discharge hole 57a is closed by a plug member 83. The plug member 83 is fitted into the inside of the discharge pipe 57 from below and is detachably attached to the discharge pipe 57. By removing the plug member 83, the worker can forcibly discharge the condensed water accumulated in the water receiving section 54 to the outside of the drain pan 40. As shown in Figures 7 and 8, a groove 58 is formed on the upper surface of the bottom 52a, connecting the opposing section 55 and the discharge hole 57a.

[0040] As shown in Figure 9, the first member 50 has a protrusion 56 that projects downward (in the -Z direction). The protrusion 56 projects downward from the lower surface of the bottom 52a of the part to be inspected 54d. As shown in Figure 8, in the first embodiment, the protrusion 56 is cylindrical with an upward opening. The upper opening of the protrusion 56 opens to the upper surface of the bottom 52a. The protrusion 56 is cylindrical with a central axis AX extending in the vertical direction Z. The central axis AX is a virtual line. In the following description, unless otherwise specified, the radial direction centered on the central axis AX may be simply called the "radial direction," and the circumferential direction around the central axis AX may be simply called the "circumferential direction."

[0041] As shown in Figure 9, the protrusion 56 has a cylindrical portion 56a that protrudes downward from the lower surface of the bottom portion 52a, and an annular portion 56b that protrudes radially inward from the lower end of the cylindrical portion 56a. The annular portion 56b is an annular shape with the central axis AX as its center. The annular portion 56b is plate-shaped with its plate surface facing the vertical direction Z.

[0042] A first hole 56c is formed in the protrusion 56. The first hole 56c penetrates the protrusion 56 in the vertical direction Z. The first hole 56c is formed on the inside of the annular portion 56b. The inner edge of the first hole 56c is the inner edge of the annular portion 56b. As shown in Figure 7, the first hole 56c is circular in shape with the central axis AX as viewed in the vertical direction Z. The first holes 56c are arranged in a line with spacing between them on the second horizontal outer side (+Y side) of the discharge hole 57a.

[0043] As shown in FIG. 7, a part of the edge of the upper opening of the convex portion 56 is connected to the side wall portion 52b when viewed in the vertical direction Z. The upper opening of the convex portion 56 is the upper opening of the cylindrical portion 56a. In the first embodiment, the end portion on the second horizontal direction outer side (+Y side) of the edge of the upper opening of the convex portion 56 is connected to the second horizontal direction inner side (-Y side) surface of the portion of the side wall portion 52b located on the second horizontal direction outer side when viewed in the vertical direction Z. The portion of the second horizontal direction inner side (-Y side) surface of the side wall portion 52b where the edge of the upper opening of the convex portion 56 is connected is a recessed portion 52c that is recessed along the edge of the upper opening of the circular convex portion 56 when viewed in the vertical direction Z. The recessed portion 52c is formed from the lower end to the upper end of the side wall portion 52b.

[0044] As shown in FIG. 6, the second member 60 is located below the first member 50. The second member 60 is fixed to the first member 50. The second member 60 is made of a foamed resin. The resin forming the second member 60 is, for example, polystyrene, vinyl chloride resin, or the like. By fixing the second member 60 made of a foamed resin below the first member 50, the second member 60 made of a foamed resin functions as a heat insulating material, and the generation of condensed water on the lower surface of the drain pan 40 is suppressed.

[0045] The second member 60 has a first portion 61, a second portion 62, and a third portion 63. The first portion 61 extends in the second horizontal direction Y. The second portion 62 and the third portion 63 extend in the first horizontal direction X. The second portion 62 is connected to the end portion on the second horizontal direction one side (+Y side) of the first portion 61. The second portion 62 protrudes on both sides of the first portion 61 in the first horizontal direction X. The third portion 63 is connected to the end portion on the second horizontal direction other side (-Y side) of the first portion 61. The third portion 63 protrudes on both sides of the first portion 61 in the first horizontal direction X.

[0046] The second member 60 is formed with a fitting recess 64. The fitting recess 64 is recessed downward from the upper surface of the second member 60. The fitting recess 64 has a first fitting recess 64a, a second fitting recess 64b, and a third fitting recess 64c. The first fitting recess 64a is formed in the first portion 61. The first fitting recess 64a extends in the second horizontal direction Y. At least a part of the portion of the first water receiving portion 54a formed in the first portion 51 of the first member 50 is fitted from above into the first fitting recess 64a.

[0047] The second fitting recess 64b is formed in the second portion 62. The second fitting recess 64b is connected to the end of the first fitting recess 64a on one side in the second horizontal direction (+Y side). The second fitting recess 64b extends in the first horizontal direction X. The second water receiving portion 54b protrudes on both sides in the first horizontal direction X from the first fitting recess 64a. At least a part of the portion of the second water receiving portion 54b formed in the second portion 52 of the first member 50 is fitted from above into the second fitting recess 64b.

[0048] The third fitting recess 64c is formed in the third portion 63. The third fitting recess 64c is connected to the end of the first fitting recess 64a on the other side in the second horizontal direction (-Y side). The third fitting recess 64c extends in the first horizontal direction X. The third fitting recess 64c protrudes on both sides in the first horizontal direction X from the first fitting recess 64a. At least a part of the portion of the third water receiving portion 54c formed in the third portion 53 of the first member 50 is fitted from above into the third fitting recess 64c.

[0049] FIG. 11 is a perspective view showing a part of the second member 60. As shown in FIG. 11, the portion of the second fitting recess 64b located on one side in the first horizontal direction (+X side) from the first fitting recess 64a is a support recess 64d. The support recess 64d opens upward. The bottom surface of the support recess 64d is located below the portion of the bottom surface of the second fitting recess 64b other than the bottom surface of the support recess 64d. The bottom surface of the support recess 64d is the surface located on the lower side among the inner surfaces of the support recess 64d. The bottom surface of the support recess 64d faces upward. The inspected portion 54d of the first member 50 is fitted from above into the support recess 64d.

[0050] The support recess 64d is formed by a bottom portion 62a and a side wall portion 62b extending upward from the bottom portion 62a. The upper surface of the bottom portion 62a forms the bottom surface of the support recess 64d. The side wall portion 62b protrudes upward from the outer edge of the bottom portion 62a. The side wall portion 62b has a roughly U-shape, opening to the other side in the first horizontal direction (-X side) when viewed in the vertical direction Z.

[0051] A recess 65 is formed in the bottom portion 62a, which is recessed downward from the upper surface of the bottom portion 62a. The recess 65 is a recess with a bottom surface that opens upward but not downward. An opposing portion 55 formed on the first member 50 is fitted into the recess 65. A through hole 67 is formed in the bottom portion 62a, which penetrates the bottom portion 62a in the vertical direction Z. As shown in Figure 10, the discharge pipe portion 57 of the first member 50 is inserted into the through hole 67 from above. The lower end of the discharge pipe portion 57 is positioned at the same location in the vertical direction Z as the lower end of the through hole 67. However, the lower end of the discharge pipe portion 57 may be positioned at a different location in the vertical direction Z than the lower end of the through hole 67. As shown in Figure 11, a groove 68 is formed on the upper surface of the bottom portion 62a, connecting the recess 65 and the through hole 67.

[0052] As shown in Figure 11, a second hole 66 is formed in the bottom portion 62a, penetrating the bottom portion 62a vertically in the direction Z. In Embodiment 1, the second hole 66 is circular in shape when viewed in the vertical direction Z, with the central axis AX as the center. The second hole 66 has a large-diameter hole portion 66a and a small-diameter hole portion 66b. The large-diameter hole portion 66a is the upper part of the second hole 66. The small-diameter hole portion 66b is the lower part of the second hole 66. The small-diameter hole portion 66b is connected to the lower side of the large-diameter hole portion 66a. The inner diameter of the small-diameter hole portion 66b is smaller than the inner diameter of the large-diameter hole portion 66a. An upward-facing stepped surface 66c is formed between the inner circumferential surface of the large-diameter hole portion 66a and the inner circumferential surface of the small-diameter hole portion 66b. The stepped surface 66c is annular, surrounding the central axis AX. More specifically, the stepped surface 66c is an annular shape centered on the central axis AX. As shown in Figure 10, the protrusion 56 is inserted into the large-diameter hole 66a from above. In other words, the protrusion 56 is located inside the large-diameter hole 66a. The outer circumferential surface of the protrusion 56 faces the inner circumferential surface of the large-diameter hole 66a with a gap in between.

[0053] As shown in Figure 11, a portion of the edge of the upper opening of the second hole 66 is connected to the side wall portion 62b when viewed in the vertical direction Z. The upper opening of the second hole 66 is the upper opening of the large-diameter hole portion 66a. In Embodiment 1, the second horizontally outer (+Y side) end of the edge of the upper opening of the second hole 66 is connected to the second horizontally inner (-Y side) surface of the portion of the side wall portion 62b located on the second horizontally outer side when viewed in the vertical direction Z. The portion of the second horizontally inner (-Y side) surface of the side wall portion 62b to which the edge of the upper opening of the second hole 66 is connected when viewed in the vertical direction Z is a recessed portion 62c that is recessed along the edge of the circular large-diameter hole portion 66a when viewed in the vertical direction Z. The recessed portion 62c is formed from the lower end to the upper end of the side wall portion 62b. The formation of the recessed portion 62c prevents the second horizontally outer end of the protrusion 56 from hitting the side wall portion 62b when assembling the first member 50 and the second member 60.

[0054] Figure 12 is a cross-sectional view showing a part of the indoor unit 20. As shown in Figure 12, the lower opening of the second hole 66 is covered by the decorative panel 26. More specifically, the lower opening of the second hole 66 is covered by an elastic member 26a formed on the upper surface of the decorative panel 26. The elastic member 26a is, for example, sponge-like. When the decorative panel 26 is removed from the housing body 21a, the lower opening of the second hole 66 is exposed to the room. The lower opening of the second hole 66 is the lower opening of the small-diameter hole portion 66b.

[0055] The indoor unit 20 is equipped with a drain pump 29. The drain pump 29 is capable of discharging water accumulated in the water receiving section 54 to the outside. The drain pump 29 has an intake port 29a at its lower end. The intake port 29a opens downwards. The intake port 29a is located above the opposing section 55. The drain pump 29 discharges the condensed water in the water receiving section 54 to the outside of the drain pan 40 by sucking up the condensed water in the opposing section 55 through the intake port 29a. The drain pump 29 is, for example, substantially cylindrical in shape and extending in the vertical direction Z.

[0056] The indoor unit 20 is equipped with an inspection window member 70. The inspection window member 70 is a member that allows the dirt inside the drain pan 40 to be inspected from the outside of the drain pan 40. The inspection window member 70 is attached to the drain pan 40. In Embodiment 1, the inspection window member 70 is a transparent member. The resin constituting the inspection window member 70 is a transparent resin such as polymethyl methacrylate, polyethylene terephthalate, polycarbonate, epoxy, or polyarylate.

[0057] Figure 13 is a perspective view showing the inspection window member 70. Figure 14 is a cross-sectional view showing the inspection window member 70 attached to the drain pan 40. As shown in Figure 13, the inspection window member 70 has a main body portion 70a and a clamped portion 72. The main body portion 70a has a cylindrical portion 71, a column portion 73, a disc portion 74, a protruding portion 75, a reflective portion 76, and a window portion 77. The cylindrical portion 71 is cylindrical with a central axis AX. As shown in Figure 14, the cylindrical portion 71 opens downwards.

[0058] The window portion 77 is plate-shaped, extending radially. More specifically, the window portion 77 is disc-shaped with a central axis AX at its center. The outer edge of the window portion 77 is connected to the upper end of the cylindrical portion 71. The window portion 77 transmits light.

[0059] The column portion 73 extends upward from the window portion 77. The column portion 73 is cylindrical with its central axis AX as the center. The outer diameter of the column portion 73 is smaller than the outer diameter of the window portion 77. The disc portion 74 is connected to the upper end of the column portion 73. The disc portion 74 protrudes radially outward from the column portion 73. The disc portion 74 is disc-shaped with its central axis AX as the center. The outer diameter of the disc portion 74 is larger than the outer diameter of the column portion 73 and smaller than the outer diameter of the window portion 77. As shown in Figure 13, the projection portion 75 protrudes upward from the upper surface of the disc portion 74. The projection portion 75 is circular with its central axis AX as the center when viewed in the vertical direction Z. The outer diameter of the projection portion 75 is smaller than the outer diameter of the column portion 73. A recess 75a that is recessed downward is formed on the upper surface of the projection portion 75. The recess 75a is circular in shape, with the central axis AX as the center when viewed in the vertical direction Z.

[0060] The reflective portion 76 is formed on the upper surface of the disc portion 74, excluding the portion where the protrusion 75 is formed. In Embodiment 1, the reflective portion 76 is an annular shape surrounding the protrusion 75. The reflective portion 76 is an annular shape centered on the central axis AX. The reflective portion 76 is located above the window portion 77. The reflective portion 76 reflects light that has passed through the window portion 77. In Embodiment 1, the reflective portion 76 is composed of a plurality of protrusions 76a that project upward from the upper surface of the disc portion 74. In Embodiment 1, the plurality of protrusions 76a are in the shape of a square pyramid that project upward. The reflective portion 76 has a plurality of protrusions 76a formed on the upper surface of the disc portion 74, excluding the portion where the protrusion 75 is formed.

[0061] The clamped portion 72 protrudes from the main body portion 70a in a direction intersecting the vertical direction Z. In Embodiment 1, the clamped portion 72 protrudes radially outward from the lower end of the cylindrical portion 71. The clamped portion 72 is annular in shape surrounding the main body portion 70a. In Embodiment 1, the clamped portion 72 surrounds the lower end of the cylindrical portion 71. The clamped portion 72 is annular in shape with the central axis AX as its center. The clamped portion 72 is plate-shaped with its plate surface facing the vertical direction Z.

[0062] As shown in Figure 14, the inspection window member 70 is held in the drain pan 40 by the clamped portion 72 being sandwiched vertically in the Z direction by the first member 50 and the second member 60. In Embodiment 1, the clamped portion 72 is sandwiched vertically in the Z direction by the stepped surface 66c and the protrusion 56 formed on the inner surface of the second hole 66. More specifically, the clamped portion 72 is sandwiched vertically in the Z direction by the stepped surface 66c and the annular portion 56b. The lower surface of the clamped portion 72 is in contact with the stepped surface 66c. The clamped portion 72 is located inside the large-diameter hole 66a. The outer diameter of the clamped portion 72 is smaller than the inner diameter of the large-diameter hole 66a. The radial outer edge of the clamped portion 72 is positioned radially inward from the inner circumferential surface of the large-diameter hole 66a. The outer diameter of the clamped portion 72 is smaller than the outer diameter of the protrusion 56. The radial outer edge of the clamped portion 72 is positioned radially inward from the outer circumferential surface of the protrusion 56.

[0063] In Embodiment 1, as shown in Figure 14, the upper surface of the clamped portion 72 is adhered to the lower surface of the annular portion 56b by the second sealing material 82. The second sealing material 82 is provided between the convex portion 56 and the clamped portion 72. In Embodiment 1, the second sealing material 82 is double-sided tape. As shown in Figure 9, the second sealing material 82 is an annular shape surrounding the central axis AX. More specifically, the second sealing material 82 is an annular shape centered on the central axis AX.

[0064] As shown in Figure 14, the portion of the main body 70a located above the clamped portion 72 is passed through the first hole 56c in the vertical direction Z. A part of the lower portion of the cylindrical portion 71 is located inside the first hole 56c. Of the main body 70a, the upper portion of the cylindrical portion 71, the window portion 77, the column portion 73, the disc portion 74, the protruding portion 75, and the reflective portion 76 are located above the first hole 56c and inside the water receiving portion 54. In other words, the upper portion of the cylindrical portion 71, the window portion 77, the column portion 73, the disc portion 74, the protruding portion 75, and the reflective portion 76 are exposed inside the water receiving portion 54 by being passed through the first hole 56c in the vertical direction Z. In Embodiment 1, the first hole 56c is a hole that exposes the window portion 77 inside the water receiving portion 54. In this disclosure, "the first hole 56c exposes the window portion 77 to the inside of the water receiving portion 54" means that the window portion 77 can be exposed to the inside of the water receiving portion 54 as a result of the formation of the first hole 56c.

[0065] In Embodiment 1, the upper portion of the cylindrical portion 71, the window portion 77, the column portion 73, the disc portion 74, the protruding portion 75, and the reflective portion 76 are located inside the inspected portion 54d. The upper portion of the cylindrical portion 71 and the window portion 77 are located inside the cylindrical portion 56a of the convex portion 56. The outer circumferential surface of the cylindrical portion 71 is positioned radially inward from the inner circumferential surface of the cylindrical portion 56a. The column portion 73, the disc portion 74, the protruding portion 75, and the reflective portion 76 are located above the interior of the convex portion 56.

[0066] The window portion 77 is located above the small-diameter hole portion 66b. When viewed in the vertical direction Z, the window portion 77 overlaps with the small-diameter hole portion 66b. An inspector performing inspection work inside the drain pan 40 through the inspection window member 70 can see the window portion 77 from below the drain pan 40 through the small-diameter hole portion 66b. In other words, the second hole 66 is a hole that exposes the window portion 77 downwards. In this disclosure, "the second hole 66 exposes the window portion 77 downwards" means that the formation of the second hole 66 allows an inspector to see the window portion 77 when looking at the drain pan 40 from below. The column portion 73, the disc portion 74, the projection portion 75, and the reflector portion 76 are located above the small-diameter hole portion 66b. When viewed in the vertical direction Z, the column portion 73, the disc portion 74, the projection portion 75, and the reflector portion 76 overlap with the small-diameter hole portion 66b.

[0067] As shown in Figure 12, the window portion 77 is positioned at a different location from the drain pump 29 when viewed in the vertical direction Z. In other words, the window portion 77 is positioned so as not to overlap with the drain pump 29 when viewed in the vertical direction Z.

[0068] As shown in Figure 14, a first sealing material 81 is provided inside the cylindrical protrusion 56 to seal the gap between the first hole 56c and the main body 70a. The first sealing material 81 fills at least a portion of the radial space between the outer surface of the cylindrical portion 71 and the inner surface of the protrusion 56, i.e., the inner surface of the cylindrical portion 56a. The first sealing material 81 is, for example, an epoxy adhesive. The first sealing material 81 is annular in shape surrounding the cylindrical portion 71. The first sealing material 81 seals the gap between the inner surface of the first hole 56c and the outer surface of the cylindrical portion 71. The upper end of the first sealing material 81 is located below the upper surface of the window portion 77.

[0069] To inspect the dirt inside the drain pan 40 using the inspection window member 70, the worker first removes the decorative panel 26 from the main housing 21a, exposing the second hole 66 to the interior. The worker uses a light source, such as a penlight, to shine incident light La into the second hole 66 from below, as shown in Figure 14. The incident light La entering the second hole 66 passes through the window 77 from below to above. At least a portion of the incident light La that has passed through the window 77 passes through the disc 74 and enters the reflecting portion 76 formed on the upper surface of the disc 74. The incident light La that enters the reflecting portion 76 is reflected by the reflecting portion 76 and becomes reflected light Lb. At least a portion of the reflected light Lb passes through the window 77 from above to below and is emitted into the interior through the second hole 66. By checking the intensity of the reflected light Lb, the worker can determine whether or not dirt has accumulated inside the water receiving portion 54 of the drain pan 40. Specifically, if dirt accumulates inside the water receiving section 54 and this dirt adheres to the upper surface of the window section 77, the incident light La and reflected light Lb will have difficulty passing through the window section 77. Therefore, when dirt accumulates inside the water receiving section 54, the intensity of the reflected light Lb emitted into the room from the second hole 66 will be weaker compared to when there is no dirt accumulation inside the water receiving section 54. Thus, the operator can check the condition of the dirt inside the water receiving section 54 by checking the intensity of the reflected light Lb.

[0070] Furthermore, since the window portion 77 transmits light, the worker can also visually inspect the inside of the water receiving portion 54 through the window portion 77. Therefore, the worker may check the condition of the dirt inside the water receiving portion 54 by visually inspecting the inside of the water receiving portion 54 through the window portion 77 from the second hole 66 without introducing incident light La into the second hole 66.

[0071] Next, the procedure for attaching the inspection window member 70 to the drain pan 40 will be described. In Embodiment 1, the inspection window member 70 is attached to the drain pan 40 when the drain pan 40 is assembled. The worker inverts the first member 50 in the vertical direction Z as shown in Figure 9, and attaches the second sealing material 82, which is double-sided tape, to the lower surface of the protrusion 56, that is, the lower surface of the annular portion 56b. Next, the worker inserts the main body portion 70a of the inspection window member 70 into the first hole 56c and adheres the clamped portion 72 to the lower surface of the protrusion 56 with the second sealing material 82. Next, the worker applies adhesive 80 to the lower surface of the first member 50. At this time, the worker does not apply adhesive 80 to the protrusion 56. The adhesive 80 is, for example, a vinyl acetate-based solution adhesive. Next, the worker brings the second member 60 close to the first member 50 and adheres and fixes the second member 60 to the first member 50 with adhesive 80. The drain pan 40 is assembled by fixing the first member 50 and the second member 60 together. Here, since adhesive 80 is not applied to the protrusion 56, as shown in Figure 14, adhesive 80 is not provided between the inner surface of the second hole 66 and the protrusion 56. In other words, adhesive 80 is not provided between the stepped surface 66c and the protrusion 56 in the vertical direction Z.

[0072] As the drain pan 40 is assembled, the clamped portion 72 is held vertically in the Z direction by the first member 50 and the second member 60, and the inspection window member 70 is held in the drain pan 40. The worker inverts the assembled drain pan 40 vertically in the Z direction so that the first member 50 is on top of the second member 60, and then injects the uncured first sealant 81 between the cylindrical portion 56a of the protrusion 56 and the cylindrical portion 71 of the inspection window member 70. As the first sealant 81 hardens, the gap between the first hole 56c and the main body portion 70a is sealed. Also, as the first sealant 81 hardens, the inspection window member 70 will no longer move radially within the range of the gap with the first hole 56c, and the inspection window member 70 can be fixed to the drain pan 40 more stably.

[0073] According to Embodiment 1, the indoor unit 20 is an indoor unit of an air conditioner 100 and includes a heat exchanger 22, a drain pan 40 located below the heat exchanger 22, and an inspection window member 70 having a light-transmitting window portion 77. The drain pan 40 has a first member 50 with a water receiving portion 54 formed therein, and a second member 60 made of foamed resin located below the first member 50 and fixed to the first member 50. The first member 50 has a first hole 56c formed therein that exposes the window portion 77 into the water receiving portion 54. The second member 60 has a second hole 66 formed therein that exposes the window portion 77 downward. The inspection window member 70 has a clamped portion 72, and the clamped portion 72 is held in the drain pan 40 by being sandwiched vertically in the Z direction by the first member 50 and the second member 60. Therefore, the inspection window member 70 can be attached to the drain pan 40 without embedding it in the second member 60 by insert molding. As a result, the thickness of the second member 60 in the vertical direction Z can be reduced by the amount that does not need to be embedded in the inspection window member 70. Consequently, the vertical dimension Z of the drain pan 40 can be reduced, and an increase in the size of the drain pan 40 can be suppressed.

[0074] According to Embodiment 1, the second hole 66 has a large-diameter hole portion 66a and a small-diameter hole portion 66b connected to the lower side of the large-diameter hole portion 66a, with an inner diameter smaller than that of the large-diameter hole portion 66a. An upward-facing stepped surface 66c is formed between the inner circumferential surface of the large-diameter hole portion 66a and the inner circumferential surface of the small-diameter hole portion 66b. The inspection window member 70 has a main body portion 70a having a window portion 77 and a clamped portion 72. The clamped portion 72 protrudes from the main body portion 70a in a direction intersecting the vertical direction Z and is an annular shape surrounding the main body portion 70a. The first member 50 has a convex portion 56 that protrudes downward. A first hole 56c is formed in the convex portion 56. The portion of the main body portion 70a located above the clamped portion 72 passes through the first hole 56c in the vertical direction Z. The convex portion 56 is located inside the large-diameter hole portion 66a. The clamped portion 72 is held vertically in the Z direction by the stepped surface 66c and the protrusion 56. Therefore, by passing the main body portion 70a of the inspection window member 70 through the first hole 56c, the inspection window member 70 can be positioned radially intersecting the vertical Z direction, while the clamped portion 72 can be pressed by the protrusion 56 around the central axis AX. Consequently, the inspection window member 70 can be held more stably in the drain pan 40.

[0075] According to Embodiment 1, the protrusion 56 is cylindrical and opens upward. Inside the protrusion 56, a first sealing material 81 is provided to seal the gap between the first hole 56c and the main body 70a. Therefore, the first sealing material 81 can prevent condensation water accumulated in the water receiving portion 54 of the drain pan 40 from leaking out of the drain pan 40 through the gap between the first hole 56c and the main body 70a. In addition, the first sealing material 81 can prevent the main body 70a, which is passed through the first hole 56c, from rattling radially within the range of the gap with the first hole 56c.

[0076] According to Embodiment 1, the window portion 77 is located above the first hole 56c. The upper end of the first sealing material 81 is located below the upper surface of the window portion 77. Therefore, adhesion of the first sealing material 81 to the upper surface of the window portion 77 can be suppressed. This prevents the window portion 77 from being discolored by the first sealing material 81 and prevents a decrease in the light transmittance of the window portion 77.

[0077] According to Embodiment 1, a second sealing material 82 is provided between the protrusion 56 and the clamped portion 72. Therefore, when the uncured first sealing material 81 is injected into the interior of the protrusion 56, even if the uncured first sealing material 81 reaches the gap between the protrusion 56 and the clamped portion 72 through the gap between the first hole 56c and the main body portion 70a, the second sealing material 82 can prevent the uncured first sealing material 81 from flowing radially outward from the gap between the protrusion 56 and the clamped portion 72. Therefore, leakage of the uncured first sealing material 81 into the small-diameter hole portion 66b through the gap between the clamped portion 72 and the stepped surface 66c can be prevented. Therefore, leakage of the first sealing material 81 to the outside of the drain pan 40 can be prevented. Furthermore, by making the second sealing material 82 an adhesive material such as double-sided tape, the clamped portion 72 can be bonded to the first member 50 by the second sealing material 82 when assembling the drain pan 40. This allows the inspection window member 70 to be temporarily fixed when assembling the drain pan 40, preventing the inspection window member 70 from falling off the first member 50 and preventing the inspection window member 70 from shifting position.

[0078] According to Embodiment 1, the first member 50 and the second member 60 are fixed to each other by adhesive 80. No adhesive 80 is provided between the stepped surface 66c and the protrusion 56 in the vertical direction Z. Therefore, when fixing the first member 50 and the second member 60 with adhesive 80, the adhesive 80 does not leak into the protrusion 56 from the gap between the first hole 56c and the main body 70a, and the adhesion of the adhesive 80 to the window portion 77 can be suppressed. Consequently, the discoloration of the window portion 77 by the adhesive 80 can be suppressed, and the reduction in the light transmittance of the window portion 77 can be suppressed.

[0079] According to Embodiment 1, the second member 60 has a bottom portion 62a in which the second hole 66 is formed, and a side wall portion 62b extending upward from the bottom portion 62a. A part of the edge of the upper opening of the second hole 66 is connected to the side wall portion 62b when viewed in the vertical direction Z. Therefore, the inspection window member 70 can be positioned close to the side wall portion 62b. This allows the inspection window member 70 to be positioned closer to the edge inside the water receiving portion 54, making it easier to provide the opposing portion 55 and the discharge hole 57a, etc., inside the water receiving portion 54.

[0080] Conventionally, the inspection window member was embedded in the second member made of foamed resin by insert molding. This required the provision of a structure in the mold to support the inspection window member during insert molding, or the provision of a jig to support the inspection window member. As a result, it was difficult to position the inspection window member near the side wall portion of the second member due to the structure of the mold or the jig. In contrast, in Embodiment 1, since it is not necessary to embed the inspection window member 70 in the second member 60 by insert molding, the second hole 66 can be formed closer to the side wall portion 62b. Therefore, a configuration can be adopted in which a part of the edge of the upper opening of the second hole 66 connects to the side wall portion 62b when viewed in the vertical direction Z, making it possible to position the inspection window member 70 closer to the side wall portion 62b. In this way, by eliminating the need to embed the inspection window member 70 in the second member 60 by insert molding, the degree of freedom in positioning the inspection window member 70 can be improved.

[0081] According to Embodiment 1, the inspection window member 70 has a reflecting portion 76 located above the window portion 77 that reflects light transmitted through the window portion 77. Therefore, as described above, the worker can check the condition of the dirt inside the water receiving portion 54 by looking at the reflected light Lb reflected by the reflecting portion 76. Thus, the worker can easily and accurately check the condition of the dirt inside the water receiving portion 54 from outside the drain pan 40 through the inspection window member 70.

[0082] According to Embodiment 1, the indoor unit 20 is equipped with a drain pump 29 capable of discharging water accumulated in the water receiving section 54, i.e., condensed water, to the outside. The window section 77 is positioned at a different location from the drain pump 29 when viewed in the vertical direction Z. Therefore, it is possible to suppress the deterioration of visibility inside the water receiving section 54 through the window section 77 due to the drain pump 29. Furthermore, if the condition of dirt inside the water receiving section 54 can be checked by reflected light Lb, as in Embodiment 1, it is possible to suppress the influence of the drain pump 29 on the intensity of the reflected light Lb, etc.

[0083] Embodiment 2. Figure 15 is a cross-sectional view showing a part of the indoor unit 220 in Embodiment 2. In the following description, components similar to those in the above-described embodiment may be omitted from the description by using the same reference numerals as appropriate.

[0084] As shown in Figure 15, in the drain pan 240 of the indoor unit 220, an annular projection 259 is formed on the lower surface of the protrusion 56 of the first member 250. The annular projection 259 protrudes downward from the lower surface of the protrusion 56 toward the stepped surface 66c. In Embodiment 2, the annular projection 259 protrudes downward from the radial outer edge of the lower surface of the protrusion 56. The annular projection 259 is located radially outside the clamped portion 72. The annular projection 259 is an annular shape surrounding the clamped portion 72. In Embodiment 2, the annular projection 259 is an annular shape centered on the central axis AX. The lower end of the annular projection 259 contacts the stepped surface 66c. The lower end of the annular projection 259 may face the stepped surface 66c with a gap in between.

[0085] The other configurations of the first member 250 are the same as those of the first member 50 in Embodiment 1. The other configurations of the drain pan 240 are the same as those of the drain pan 40 in Embodiment 1. The other configurations of the indoor unit 220 are the same as those of the indoor unit 20 in Embodiment 1.

[0086] According to Embodiment 2, an annular projection 259 is formed on the lower surface of the protrusion 56, projecting toward the stepped surface 66c and surrounding the clamped portion 72. Therefore, when fixing the first member 250 and the second member 60, even if adhesive 80 flows between the outer circumferential surface of the protrusion 56 and the inner circumferential surface of the large-diameter hole 66a, the annular projection 259 can prevent the flow of the adhesive 80 between the clamped portion 72 and the protrusion 56. Consequently, when fixing the first member 250 and the second member 60 with adhesive 80, it is possible to prevent the adhesive 80 from leaking into the protrusion 56 from the gap between the first hole 56c and the main body portion 70a, and to further prevent the adhesive 80 from adhering to the window portion 77. Consequently, it is possible to further prevent the window portion 77 from being colored by the adhesive 80, and to further prevent a decrease in the light transmittance of the window portion 77.

[0087] In the second embodiment, the annular projection 259 effectively prevents the adhesive 80 from adhering to the window portion 77. Therefore, when fixing the first member 250 and the second member 60 with the adhesive 80, the adhesive 80 may be applied to the outer surface of the protrusion 56. This further improves the fixing strength between the first member 250 and the second member 60.

[0088] While embodiments of this disclosure have been described above, this disclosure is not limited to the configurations of the embodiments described above, and the following configurations and methods may also be adopted.

[0089] The inspection window member may have any configuration as long as it has a window portion and a clamped portion. The inspection window member does not have to have a reflective portion. The clamped portion does not have to transmit light. The first member may have any configuration as long as it has a water receiving portion and a first hole. The first member may be made of a resin material other than ABS resin, or of a material other than resin such as metal. The second member may have any configuration as long as it has a second hole and is made of foamed resin. Any adhesive may be used to bond the first member and the second member. The first sealing material may be made of any material as long as it can seal the gap between the first hole and the main body of the inspection window member. The first sealing material may not be provided. The second sealing material may be made of any material. The second sealing material may not bond the protrusion and the clamped portion. The second sealing material may not be provided. A part of the edge of the upper opening of the second hole may be close to the side wall of the second member when viewed vertically, without being connected to the side wall. "A portion of the edge of the upper opening of the second hole is close to the side wall when viewed vertically" means, for example, that the distance between a portion of the edge of the upper opening of the second hole and the side wall when viewed vertically is 6 mm or less. The type of indoor unit according to this disclosure is not particularly limited.

[0090] The configurations and methods described herein can be combined as appropriate, provided they are not contradictory.

[0091] 10...Outdoor unit, 22...Heat exchanger, 20, 220...Indoor unit, 29...Drain pump, 40, 240...Drain pan, 50, 250...First component, 54...Water receiving part, 56...Protrusion, 56c...First hole, 60...Second component, 62a...Bottom part, 62b...Side wall part, 66...Second hole, 66a...Large diameter hole part, 66b...Small diameter hole part, 66c...Stepped surface, 70...Inspection window component, 70a...Main body part, 72...Clamped part, 76...Reflective part, 77...Window part, 80...Adhesive, 81...First sealant, 82...Second sealant, 100...Air conditioner, 259...Annular projection, Z...Vertical direction

Claims

1. An indoor unit of an air conditioner, comprising: a heat exchanger; a drain pan located below the heat exchanger; and an inspection window member having a light-transmitting window portion, wherein the drain pan comprises: a first member having a water receiving portion formed thereon; and a second member made of foamed resin located below the first member and fixed to the first member, wherein the first member has a first hole formed therein that exposes the window portion into the water receiving portion, and the second member has a second hole formed therein that exposes the window portion downward, and the inspection window member has a clamped portion, and the clamped portion is held in the drain pan by being vertically clamped between the first member and the second member.

2. The indoor unit according to claim 1, wherein the second hole has a large diameter hole portion and a small diameter hole portion connected to the lower side of the large diameter hole portion and having an inner diameter smaller than that of the large diameter hole portion, an upward-facing stepped surface is formed between the inner circumferential surface of the large diameter hole portion and the inner circumferential surface of the small diameter hole portion, the inspection window member has a main body portion having the window portion, the clamped portion protrudes from the main body portion in a direction intersecting the vertical direction and is an annular shape surrounding the main body portion, the first member has a convex portion protruding downward, the first hole is formed in the convex portion, the portion of the main body portion located above the clamped portion passes through the first hole in a vertical direction, the convex portion is located inside the large diameter hole portion, and the clamped portion is clamped vertically between the stepped surface and the convex portion.

3. The indoor unit according to claim 2, wherein the protrusion is cylindrical with an upward opening, and a first sealing material is provided inside the protrusion to close the gap between the first hole and the main body.

4. The indoor unit according to claim 3, wherein the window portion is located above the first hole, and the upper end of the first sealing material is located below the upper surface of the window portion.

5. The indoor unit according to claim 3 or 4, wherein a second sealing material is provided between the protrusion and the clamped portion.

6. The indoor unit according to any one of claims 2 to 5, wherein the first member and the second member are fixed to each other by adhesive, and no adhesive is provided in the vertical direction between the stepped surface and the protrusion.

7. The indoor unit according to any one of claims 2 to 6, wherein an annular projection is formed on the lower surface of the convex portion, projecting toward the stepped surface and surrounding the clamped portion.

8. The indoor unit according to any one of claims 1 to 7, wherein the second member has a bottom portion in which the second hole is formed, and a side wall portion extending upward from the bottom portion, and a portion of the edge of the upper opening of the second hole is connected to the side wall portion when viewed in the vertical direction.

9. The indoor unit according to any one of claims 1 to 8, wherein the inspection window member is located above the window portion and has a reflective portion that reflects light transmitted through the window portion.

10. An indoor unit according to any one of claims 1 to 9, comprising a drain pump capable of discharging water accumulated in the water receiving section to the outside, wherein the window section is positioned differently from the drain pump when viewed in the vertical direction.

11. An air conditioner comprising an indoor unit according to any one of claims 1 to 10 and an outdoor unit.

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