Indoor unit

Abstract

To provide indoor equipment to / from which an antibacterial agent unit is attachable / detachable and which improves the performance of supporting the antibacterial agent unit.SOLUTION: An antibacterial agent unit 40 is detachably arranged in a drain water passage 27b of a drain pan 19 near a drain pan side blow-out part 26. The antibacterial agent unit 40 includes a storage part 41 storing an antibacterial agent, and a mounting plate member 54. The storage part 41 abuts on the wall surface of the drain pan side blow-out part 26 of the drain pan 19, and fixes the mounting plate member 54 to the bottom surface of a casing in the state of setting the mounting plate member 54 along the wall surface of the drain pan side blow-out part 26 and the bottom surface of the casing when mounting the storage part 41 to the drain pan 19.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present invention relates to an indoor unit.

Background Art

[0002] Patent Document 1 discloses a technique in which an antibacterial agent unit has a housing portion that houses an antibacterial agent, a fixing portion that is provided integrally with the housing portion and extends horizontally, and a vertical portion that is provided integrally with the fixing portion and extends downward. The antibacterial agent unit is disposed near the suction port, and the antibacterial agent unit is fixed by sandwiching the wall surface at the suction port by the housing portion, the fixing portion, and the vertical portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present disclosure provides an indoor unit in which an antibacterial agent unit is detachable and the supportability of the antibacterial agent unit is improved.

Means for Solving the Problems

[0005] To achieve the above object, an indoor unit of the present disclosure has a housing, a drain pan provided in the housing, and an air outlet formed in the drain pan. In the indoor unit, an antibacterial agent unit is detachably disposed in a drain water passage of the drain pan near the air outlet. The antibacterial agent unit includes a housing portion that houses an antibacterial agent and a mounting plate member. A knob is provided on the mounting plate member, and the knob is provided at approximately the lower end of the wall surface of the air outlet when the mounting plate member is fixed to the bottom surface of the drain pan. .

Effects of the Invention

[0006] According to this disclosure, the antibacterial agent unit can be installed without removing the decorative panel by inserting the antibacterial agent unit from below the panel-side outlet and the drain pan-side outlet, positioning the housing portion inside the drain pan, and fixing the mounting plate member to the bottom surface of the housing while aligning the mounting plate member with the wall surface of the drain pan-side outlet and the bottom surface of the housing. [Brief explanation of the drawing]

[0007] [Figure 1] Cross-sectional view showing the internal structure of the indoor unit according to Embodiment 1 [Figure 2] Perspective view of the indoor unit of Embodiment 1 [Figure 3] Plan view of the drain pan of Embodiment 1, seen from below. [Figure 4] Enlarged view of a portion of Figure 3 [Figure 5] Perspective view showing the antibacterial agent unit of Embodiment 1 [Figure 6] Exploded perspective view showing the antibacterial agent unit of Embodiment 1 [Figure 7] A view of the indoor unit from below when installing the antibacterial agent unit. [Figure 8] A view from above of the drain pan when installing the antibacterial agent unit. [Figure 9] Perspective view showing the antibacterial agent unit installed. [Modes for carrying out the invention]

[0008] (Knowledge and other information that formed the basis of the invention) At the time the inventors conceived of this disclosure, there was a technology in which an antibacterial agent unit was placed near the intake port, and the antibacterial agent unit was fixed by sandwiching the wall surface of the intake port between a housing part, a fixing part, and a vertical part. However, we discovered a problem with conventional technologies where the wall surface is sandwiched between antibacterial material units: the support for the antibacterial material units is insufficient. To solve this problem, we have come to form the subject of this disclosure. Therefore, this disclosure provides an indoor unit in which the antibacterial agent unit is detachable and which improves the support of the antibacterial agent unit.

[0009] The embodiments will be described in detail below with reference to the drawings. However, unnecessary details may be omitted. For example, detailed explanations of already well-known matters or redundant explanations of substantially identical configurations may be omitted. This is to avoid the following explanation becoming unnecessarily verbose and to facilitate understanding for those skilled in the art. The attached drawings and the following description are provided to enable those skilled in the art to fully understand this disclosure and are not intended to limit the subject matter described in the claims.

[0010] (Embodiment 1) Embodiment 1 will be described below with reference to the drawings. [1-1. Structure] [1-1-1. Overall configuration of the indoor unit] Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Figure 1 is a cross-sectional view showing the internal structure of the indoor unit 10 of an air conditioning system according to an embodiment of the present invention. Figure 2 is a perspective view of the indoor unit 10. In the following explanation, "up and down" and "inside and outside" refer to the indoor unit 10 installed on the ceiling. The space from which the conditioned air is blown is referred to as the conditioned room.

[0011] The indoor unit 10 is installed in the ceiling space 13 between the building's ceiling 11 and a ceiling panel 12 installed below the ceiling 11. The indoor unit 10 comprises an indoor unit body 14 and a decorative panel 30 that covers the lower opening of the indoor unit body 14. The indoor unit body 14 comprises a roughly box-shaped housing 15 with an almost entirely open bottom surface. Inside the housing 15, the indoor unit body 14 includes a polystyrene foam insulation member 16, an indoor heat exchanger 17, a blower 18, a drain pan 19 for receiving drain water from the indoor heat exchanger 17, and a bell mouth 20 for rectifying the air drawn into the blower 18. At the corners of the outer surface of the housing 15, a hanging fitting 21 is attached. The indoor unit main body 14 is installed in a suspended state from the ceiling 11 by connecting the hanging fitting 21 to a hanging bolt 22 hanging down from the ceiling 11.

[0012] The decorative panel 30 is formed in a substantially rectangular plate shape in plan view so as to cover the opening on the lower surface of the indoor unit main body 14. In the central portion of the decorative panel 30, a panel side suction port 31 communicating with the bell mouth 20 is formed. An intake grill 32 covering the panel side suction port 31 is detachably attached to the decorative panel 30. A filter 33 for removing dust in the air is provided on the indoor unit main body 14 side of the intake grill 32.

[0013] Panel side air outlets 34 for sending the air-conditioned air to the conditioned room are formed at positions along each side of the outer peripheral portion of the decorative panel 30 outside the panel side suction port 31 of the decorative panel 30. That is, the panel side air outlets 34 are provided along each side of the substantially rectangular decorative panel 30 in plan view, and air is blown out in four directions from the panel side air outlets 34. Each of the panel side air outlets 34 is provided with a flap 35 (see FIG. 2) whose blowing direction can be adjusted.

[0014] The heat insulating member 16 is provided on the inner surfaces of the side plate 15a and the top plate 15b of the housing 15 to prevent the occurrence of condensation in the housing 15. The blower 18 is configured to include a fan motor 23 and a centrifugal fan 24. The fan motor 23 includes a rotating shaft 23a extending downward, and the centrifugal fan 24 is fixed to the rotating shaft 23a. The fan motor 23 is arranged substantially at the center of the indoor unit 10 in plan view and is fixed to the top plate 15b of the housing 15. The centrifugal fan 24 comprises a disc-shaped main plate 24a fixed to the rotating shaft 23a, an annular shroud 24b positioned below the main plate 24a and substantially coaxial with the main plate 24a, and a plurality of blades 24c connecting the shroud 24b and the main plate 24a. The blades 24c are arranged in a plurality at intervals from each other in the circumferential direction of the main plate 24a.

[0015] The indoor heat exchanger 17 is formed by folding a plate-shaped heat exchanger into a roughly rectangular shape in a plan view, so as to surround almost the entire blower 18 from the side. The indoor heat exchanger 17 functions as a refrigerant evaporator during cooling operation and as a refrigerant evaporator during heating operation. The indoor heat exchanger 17 is configured to exchange heat between the indoor air drawn into the indoor unit body 14 and the refrigerant, thereby cooling the air in the air-conditioned room during cooling operation and heating the air during heating operation.

[0016] Figure 3 is a plan view of the drain pan of the indoor unit body 14, seen from below. Figure 4 is an enlarged view of a part of Figure 3. The drain pan 19 is positioned below the indoor heat exchanger 17 so that it can receive the drain water generated by the indoor heat exchanger 17. The drain pan 19 is made of expanded polystyrene.

[0017] As shown in Figure 3, the drain pan 19 is formed in a roughly rectangular plate shape so as to cover almost the entire opening on the bottom surface of the housing 15. In a plan view, the drain pan 19 has a drain pan side intake port 25 in the center through which air drawn into the blower 18 passes. The drain pan 19 also has a drain pan side outlet 26 outside the drain pan side intake port 25, at a position overlapping with each panel side outlet 34, through which air blown into the conditioned chamber passes.

[0018] Furthermore, the drain pan 19 includes a heat exchanger housing section 27 that accommodates the lower end of the indoor heat exchanger 17. The heat exchanger housing section 27 is formed between the drain pan side discharge section 26 and the drain pan side intake port 25, and is formed in the shape of a water channel that encircles the outer circumference of the drain pan 19. The drain pan 19 includes a drain water passage 27b that is formed outside the heat exchanger housing 27 and at a lower level than the heat exchanger housing 27. The drain water passage 27b is located below the lower surface of the outer periphery of the indoor heat exchanger 17. The indoor unit 10 has a drain pump (not shown) installed on the drain water passage 27b for discharging drain water.

[0019] In plan view, the drain water passage 27b is formed in a roughly rectangular shape along the lower surface of the indoor heat exchanger 17. The drain water passage 27b has a lowest point 29L at one of its four corners where the drain water passage 27b is at its lowest position. The suction position 28 of the drain pump is located at the lowest point 29L. The drain water is collected at a minimum level of 29L and then sucked out by a drain pump and discharged to the outside.

[0020] The indoor heat exchanger 17, drain pan 19, and bell mouth 20 enclose the inside of the housing 15, forming a blower chamber 36 where the blower 18 is housed. Additionally, an air passage 37 is formed between the outer surface of the indoor heat exchanger 17 and the insulating member 16 of the side plate 15a of the housing 15, through which the air that has undergone heat exchange in the indoor heat exchanger 17 passes. When the indoor unit 10 is operated, the rotation of the blower 18 draws air from the heated room through the panel-side intake 31 (Figure 1) and the bell mouth 20 into the blower room 36. The air in the blower room 36 is then blown outwards by the blower 18, undergoes heat exchange as it passes through the indoor heat exchanger 17, flows into the airflow path 37, and is blown out into the heated room from the panel-side outlet 34 (Figure 1). The drain pan-side outlet 26 forms part of the airflow path 37.

[0021] [1-1-2. Composition of the antibacterial agent unit] Figure 5 is a perspective view showing the antibacterial agent unit. Figure 6 is an exploded perspective view showing the antibacterial agent unit. Figure 7 is a view of the indoor unit from below when the antibacterial agent unit is installed. Figure 8 is a view of the drain pan 19 from above when the antibacterial agent unit is installed. Figure 9 is a perspective view showing the unit with the antibacterial agent unit installed.

[0022] As shown in Figures 3 and 4, an antimicrobial agent unit 40 is installed near the lowest point 29L of the drain pan 19. More specifically, the antimicrobial agent unit 40 is positioned closer to the lowest point 29L of the drain pan side discharge section 26, which is the drain water passage 27b portion that is continuous with the lowest point 29L of the drain pan 19.

[0023] As shown in Figures 5 to 7, the antibacterial agent unit 40 comprises a roughly rectangular box-shaped housing section 41 with an open top, and a lid member 50 that closes the top surface of the housing section 41. The housing section 41 is formed in a roughly rectangular box shape with an open top, and an antibacterial agent, such as silver ions (not shown), is housed inside the housing section 41. Through holes 42 are formed in the bottom corners of the storage section 41. Locking claws 43 are formed on the upper sides of the housing section 41 so as to protrude laterally. A guide projection 44 is formed on one surface of the housing section 41. The guide projection 44 is tapered, with its width decreasing towards the bottom.

[0024] The lid member 50 includes a lid portion 51 that covers the upper surface of the housing portion 41. Fixing flanges 52 extending downward are integrally provided on both sides of the lid portion 51, and the fixing flanges 52 have engagement holes 53 that engage with the locking claws 43 of the housing portion 41. An attachment plate member 54 is provided on the upper surface of the lid portion 51, which extends upward and then extends downward at a predetermined distance from the lid portion 51. The lid portion 51 and the mounting plate member 54 are each made of resin material.

[0025] A screw hole 55 is formed in the lower end portion of the mounting plate member 54. A knob portion 56 is formed protruding from one surface of the mounting plate member 54. Then, with the predetermined antibacterial agent stored in the storage section 41, the lid member 50 is attached to the upper surface of the storage section 41, and the lid member 50 is fixed to the storage section 41 by engaging the engagement hole 53 of the lid member 50 with the locking claw 43 of the storage section 41.

[0026] Furthermore, in this embodiment, a plurality of protrusions 57 are formed on the upper surface and side wall surface of the mounting plate member 54. The grooves formed by these plurality of protrusions 57 are formed to extend in the longitudinal direction of the mounting plate member 54. The formation of multiple indentations 57 in this manner allows the worker to easily grasp the position of the mounting plate member 54 when reaching into the panel outlet 34 to remove the antibacterial agent unit 40. Furthermore, the multiple indentations 57 can hold condensation water, thus preventing condensation water adhering to the mounting plate member 54 from dripping.

[0027] As shown in Figure 8, a support portion 60 is provided at the mounting position of the antibacterial agent unit 40 in the drain pan 19. The support portion 60 abuts against one surface of the housing portion 41 of the antibacterial agent unit 40 and holds the housing portion 41 between itself and the wall surface of the drain pan side discharge portion 26 of the drain pan 19. The support portion 60 has an engagement notch 61 into which the guide projection 44 of the housing portion 41 engages. The engagement notch 61 is tapered, with its lower width becoming smaller to match the guide projection 44.

[0028] Furthermore, a first recess 62 is formed at a position corresponding to the support portion 60 on the upper part of the wall surface of the drain pan side outlet portion 26, where the mounting plate member 54 of the antibacterial agent unit 40 is positioned. Furthermore, a second recess 65, which is continuous with the first recess 62, is formed on the inner wall surface of the drain pan side outlet 26. The depth dimensions of the first recess 62 and the second recess 65 are formed to be approximately the same as the thickness dimension of the support portion 60, and the support portion 60 is configured such that the height of the wall surface of the drain pan side discharge portion 26 is flush with the surface when the support portion 60 is installed in the first recess 62 and the second recess 65. Furthermore, a screw-fastening recess 63 is formed on the lower surface of the drain pan-side discharge portion 26 of the drain pan 19, into which a fixing portion, formed by bending the lower end of the mounting plate member 54, engages.

[0029] The antibacterial agent unit 40 is installed between the wall surface of the drain pan side outlet 26 and the support part 60, and the width dimension of the drain water passage 27b adjacent to the lowest point 29L is formed to be approximately the same as the width dimension of the support part 60 and the drain pan side outlet 26. Furthermore, the drain pan is further provided with a weir section 64 of a predetermined height that connects the support section to the installation section of the indoor heat exchanger. As a result, when the drain water flows through the drain water passage 27b of the drain pan 19 and reaches the lowest point 29L, it is guided to the antibacterial agent unit 40 by the weir 64, so that it is always possible to pass through the installation location of the antibacterial agent unit 40. The antibacterial agent unit 40 is installed in the drain pan 19 such that there is a small gap between it and the bottom surface of the drain water passage 27b of the drain pan 19.

[0030] [1-2 Effect] Next, the operation of this embodiment will be described. [1-2-1 Installation of the antibacterial agent unit] First, let's explain how to install the antibacterial agent unit 40. The antibacterial agent unit 40 is inserted from below the panel-side air outlet 34, as shown in Figure 7. The worker, for example, holds the knob portion 56 with a tool such as pliers and inserts the antibacterial agent unit 40 so that the housing portion 41 of the antibacterial agent unit 40 is positioned inside the wall surface of the drain pan side outlet portion 26, using the screw-fastening recess 63 and the first recess 62 as landmarks.

[0031] When the housing portion 41 of the antibacterial agent unit 40 moves over the wall surface of the drain pan side outlet portion 26, the drain pan 19 is provided with a support portion 60, so as shown in Figure 9, the guide projection 44 of the housing portion 41 is inserted into the engagement notch 61 of the support portion 60. Subsequently, by moving the antibacterial agent unit 40 downward, the guide projection 44 is guided into the engagement notch 61 of the support portion 60, so that the worker can position the housing portion 41 of the antibacterial agent unit 40 in the predetermined position even when the inside of the wall surface of the drain pan side outlet portion 26 is not visible.

[0032] Subsequently, the lower part of the mounting plate member 54 is bent along the side wall of the drain pan side outlet 26, and a screw is screwed into the screw hole 55 to fix the lower end of the mounting plate member 54 to the screw-fastening recess 63. This completes the installation of the antibacterial agent unit 40. Furthermore, when removing the antibacterial agent unit 40, the antibacterial agent unit 40 can be easily removed by removing the screws, lifting the antibacterial agent unit 40 upwards, and allowing the housing portion 41 of the antibacterial agent unit 40 to pass over the wall surface of the drain pan side outlet portion 26.

[0033] [1-2-2 Operation of the indoor unit] When the indoor unit is operated, the blower is driven to rotate, and the air blown by the blower is drawn into the blower room 36. The inhaled air passes through the indoor heat exchanger 17, where heat is exchanged, and is then blown out into the air-conditioned room through the air supply passage 37 and the drain pan side outlet 26. Then, when condensation occurs due to heat exchange by the indoor heat exchanger, this condensed water drips as drain water into the drain water passage 27b of the drain pan 19.

[0034] The drain water flowing into the drain water passage 27b flows toward the lowest point 29L. In this case, the antibacterial agent unit 40 is installed between the wall surface of the drain pan side outlet section 26 and the support section 60, and the width dimension of the drain water passage 27b adjacent to the lowest point 29L is formed to be approximately the same as the width dimension of the support section 60 and the wall surface of the drain pan side outlet section 26, and the drain water is guided toward the antibacterial agent unit 40 by the weir section 64, so that the drain water flowing toward the lowest point 29L will always pass through the installation area of ​​the antibacterial agent unit 40. The drain water added to the installation area of ​​the antibacterial agent unit 40 flows into the interior of the storage section 41 through the through hole 42 of the storage section 41, comes into contact with the antibacterial agent and is disinfected, and is stored at the lowest point 29L of the drain pan 19. When a predetermined amount of drain water accumulates at the minimum point of 29L, the drain water pump is activated and the water is discharged to the outside of the indoor unit.

[0035] [1-3. Effects, etc.] As described above, in this embodiment, an antibacterial agent unit 40 is detachably placed in the drain water passage 27b of the drain pan 19 near the drain pan side outlet 26 (panel side outlet 34). The antibacterial agent unit 40 comprises a housing portion 41 for housing the antibacterial agent and a lid member 50 having a mounting plate member 54. The housing portion 41 abuts against the wall surface of the drain pan side outlet 26 of the drain pan 19. When attaching the housing portion 41 to the drain pan 19, the mounting plate member 54 is fixed to the bottom surface of the housing with the mounting plate member 54 aligned with the wall surface of the drain pan side outlet 26 and the bottom surface of the housing. According to this, the antibacterial agent unit 40 can be installed without removing the decorative panel by inserting it from below the panel-side air outlet 34 and the drain pan-side air outlet 26, positioning the housing 41 inside the drain pan 19, and fixing the mounting plate member 54 to the bottom of the housing while aligning it with the wall surface of the drain pan-side air outlet 26 and the bottom surface of the housing.

[0036] Furthermore, in this embodiment, a knob portion 56 is provided on the mounting plate member 54, and the knob portion 56 is provided at approximately the lower end of the wall surface of the drain pan side outlet portion 26 (panel side outlet 34) while the mounting plate member 54 is fixed to the bottom surface of the housing. According to this, the antibacterial agent unit 40 can be easily attached from the panel-side air outlet 34 and the drain pan-side air outlet 26 while holding the knob portion 56 with a tool such as pliers. In addition, by providing the knob portion 56 at approximately the lower end of the wall surface of the drain pan-side air outlet 26, the knob portion 56 can be easily held.

[0037] In this embodiment, a first recess 62 is formed on the upper part of the wall surface of the drain pan side outlet 26 (panel side outlet 34), the mounting plate member 54 of the lid member 50 is positioned in the first recess 62, and the depth dimension of the first recess 62 is formed to be approximately the same as the thickness dimension of the mounting plate member 54. According to this, the first recess 62 can be used to position the mounting plate member 54. Furthermore, when the mounting plate member 54 is installed in the first recess 62, the wall surface of the drain pan side outlet 26 of the drain pan 19 becomes flush, which can suppress the airflow resistance of the airflow through the panel side outlet 34.

[0038] In this embodiment, a second recess 65 is formed on the wall surface of the drain pan side outlet 26 (panel side outlet 34), the mounting plate member 54 is placed in the second recess 65, and the depth dimension of the second recess 65 is formed to be approximately the same as the thickness dimension of the mounting plate member 54. According to this, the second recess 65 can be used to position the mounting plate member 54. Furthermore, when the mounting plate member 54 is installed in the second recess 65, the wall surface of the drain pan side outlet 26 of the drain pan 19 becomes flush, which can suppress the airflow resistance of the airflow through the panel side outlet 34.

[0039] In this embodiment, the drain pan 19 is provided with a support portion 60 positioned substantially parallel to the wall surface of the drain pan side outlet portion 26 (panel side outlet 34), and the support portion 60 has an engagement notch 61 that is open at the top, and the housing portion 41 has a guide projection 44 that engages with the engagement notch 61 when the antibacterial agent unit 40 is installed. According to this, the support portion 60 can support the antibacterial material unit in a direction substantially parallel to the wall surface of the drain pan side discharge portion 26. Furthermore, the antibacterial material unit 40 can be positioned by engaging the guide projection 44 of the antibacterial material unit 40 with the engagement notch 61 of the support portion 60.

[0040] Furthermore, in this embodiment, the guide projection 44 is formed in a tapered shape with its width decreasing downwards, and the engagement notch 61 is formed in a tapered shape with its width decreasing downwards to match the shape of the guide projection 44. According to this, when the antibacterial agent unit 40 is inserted and installed from below the drain pan side outlet 26, the tapered guide projection 44 is guided by the engagement notch 61 of the support part 60, and the antibacterial agent unit 40 can be positioned and installed even when the housing part 41 of the antibacterial agent unit 40 is not visible from the outside.

[0041] Furthermore, in this embodiment, the storage section 41 is arranged at a predetermined distance from the bottom surface of the drain water passage 27b. According to this, it is possible to suppress obstruction of the flow of drain water when the drain water flowing through the drain water passage 27b flows to the lowest point 29L.

[0042] (Other embodiments) As described above, Embodiment 1 has been explained as an example of the technology disclosed in this application. However, the technology in this disclosure is not limited to this and can be applied to embodiments that have been modified, replaced, added, or omitted. Furthermore, it is possible to create new embodiments by combining the components described in Embodiment 1 above. For example, in the above embodiment, the antibacterial agent unit 40 is provided at the drain pan side outlet 26, but it may also be placed near the suction port. Furthermore, although the above embodiment described the antibacterial agent unit 40 as having a mounting plate member 54 on the lid member 50, the mounting plate member 54 may also be provided on the housing section 41. [Industrial applicability]

[0043] This disclosure is applicable to indoor units that allow the antibacterial agent unit to be attached and detached without removing the decorative panel. [Explanation of symbols]

[0044] 10 Indoor unit 14. Indoor Unit Body 15 cabinets 16. Insulation material 17 Indoor heat exchanger 18 Blower 19 Drain pan 23 Fan motor 24 Centrifugal fan 25 Panel-side intake port 26. Drain pan side outlet 26. Drain pan side outlet 27 Heat exchanger housing 27b Drain water passage 28 Drain pump suction position 29L lowest point 30 decorative panels 32 Grill 33 filters 34 Panel-side air outlet 35 Flap 36 Blower room 37 Airflow channel 40 Antimicrobial Units 41 Storage Unit 42 Through hole 43 Locking claws 44 Guide protrusions 50 Lid member 51 Lid 52 Fixing flange 53 Engagement hole 54 Mounting plate member 55 screw holes 56 Knob part 60 Support part 62 First recess 63 Screw-fastening recess 64 Weir 65 Second recess

Claims

1. In an indoor unit having a housing, a drain pan provided in the housing, and an air outlet formed in the drain pan, An antibacterial agent unit is detachably placed in the drain water passage of the drain pan near the outlet. The antibacterial agent unit comprises a housing for containing the antibacterial agent and a mounting plate member. A knob is provided on the mounting plate member, The knob portion is provided at approximately the lower end of the wall surface of the air outlet, with the mounting plate member fixed to the bottom surface of the drain pan. An indoor unit characterized by the following features.

2. A first recess is formed on the upper part of the wall surface of the outlet of the drain pan, The mounting plate member is positioned in the first recess, The depth dimension of the first recess is formed to be substantially the same as the thickness dimension of the mounting plate member. The indoor unit according to feature 1.

3. A second recess is formed on the inner wall surface of the outlet of the drain pan, The mounting plate member is positioned in the second recess, The depth dimension of the second recess is formed to be approximately the same as the thickness dimension of the mounting plate member. The indoor unit according to claim 1 or 2.

4. The drain pan is provided with a support portion that is positioned substantially parallel to the wall surface of the outlet, The support portion has an engagement notch that is open at the top. The housing section is formed with a guide projection that engages with the engagement notch when the antibacterial agent unit is installed. An indoor unit according to any one of claims 1 to 3.

5. The guide projection is formed in a tapered shape, with its width decreasing towards the bottom. The engagement notch is tapered, with its lower width decreasing to match the shape of the guide projection. The indoor unit according to feature 4.

6. The housing section is arranged at a predetermined distance from the bottom surface of the drain water passage. An indoor unit according to any one of claims 1 to 5.

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