JP5148240B2 - Air conditioner indoor unit - Google Patents

Description

  The present invention relates to an indoor unit of an air conditioner, for example, a ceiling-embedded type, and in particular, leaks drain water from between a drain port provided in a drain pan and a drain plug member that closes the drain port so as to be openable and closable. The present invention relates to improvement of the packing to prevent.

  The indoor unit of the air conditioner that is embedded in the ceiling is a blower, a heat exchanger, and a drain pan that receives drain water generated by the heat exchanger during cooling operation, inside the indoor unit main body arranged in the ceiling, A drain pump or the like for discharging the drain water accumulated in the drain pan to the outside through a drain hose is provided.

  In addition, the drain pan is used to forcibly drain the drain water accumulated in the drain pan when the drain hose is clogged or the drain pump is out of order, or the drainage water generated and accumulated in the drain pan after long-term use. A drain port is provided for maintenance work such as removal of particulate matter.

  For example, in [Patent Document 1], a drain cap that seals the drain port is configured to be detachable from the drain port and fixed in a watertight manner. Furthermore, a technique has been disclosed in which a drain hole is provided in a substantially central portion of the drain cap, and a drain plug is provided that is detachably attached to the drain hole and fixed in a watertight manner.

When performing maintenance such as removing slime from the drain pan, remove the drain cap from the drain port set to a large diameter, and when draining water, remove the drain plug and open the small-diameter drain hole. . Furthermore, it is configured to be screwed and fixed to the drain port via a plurality of O-rings on the inner wall surface where the drain port and the drain cap are fitted.
JP 2007-85690 A

  That is, an O-ring is used as a packing (also referred to as “gasket”) for preventing leakage of drain water from the drain cap and the drain port. This O-ring is not specifically described in [Patent Document 1], but is made of, for example, a rubber composition that is sandwiched between two sealed members to maintain sealing performance.

  The O-ring has a literally “O” cross-sectional shape, and is pressed between two seal members, whereby the contact portion with the seal member is elastically deformed into a flat shape. The packing has a use that slides on the contact surface between the seal member and the member to be sealed and a use that does not slide, but in order to maintain high sealing performance, a material with a high elastic modulus is used. .

  However, generally used packings as well as O-rings have a high elastic modulus over a long period of use in a state where the contact portion with the sealing member is elastically deformed in a flat shape. "Is likely to occur.

  Therefore, when the drain cap and packing are removed from the drain port, maintenance work is performed, and re-installation is performed after the work is completed, the packing used so far often cannot be completely restored to the original cross-sectional shape. If the drain cap is slightly tightened, problems such as water leakage without obtaining the original sealing property occur.

  The present invention has been made on the basis of the above circumstances, and the purpose of the present invention is to prevent aging even if used over a long period of time, and to return to the original cross-sectional shape at an early stage to cause water leakage. An object of the present invention is to provide an indoor unit of an air conditioner equipped with a packing that can be reliably prevented and improved in reliability.

In order to satisfy the above object, the indoor unit of the air conditioner of the present invention accommodates a heat exchanger in the interior of the indoor unit main body that is a casing, and drain water generated by the heat exchanger at the lower part of the heat exchanger. The drain pan is provided with a drain pump that pumps up the drain water collected in the drain pan and discharges it to the outside. The drain port is used to drain the drain water remaining on the drain pan at the bottom wall of the drain pan. A cross-section is formed in a substantially X shape between the drain plug member and the bottom wall of the drain pan so as to prevent leakage of drain water from between the drain port and the drain plug member. Insert the packing.
The packing includes a base portion formed along the center of the cross section and side portions integrally projecting in four directions at a predetermined angle from the peripheral surface of the base portion. The drain plug member has a recess in the outer peripheral wall, and is sandwiched between the flange portion of the drain plug member and the bottom wall of the drain pan. The protrusions fit into the recesses of the drain plug member.

  If the packing of the present invention is adopted, the secular change hardly occurs even over a long period of use, and it is possible to return to the original cross-sectional shape at an early stage to surely prevent water leakage and to improve reliability. Play.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Note that components and components not labeled in the text are not shown. Also, in order to avoid complications in the figure, components and components may not be labeled. is there)
FIG. 1 is a perspective view of an indoor unit of an air conditioner that is a ceiling-embedded type according to an embodiment of the present invention. FIG. 2 is a bottom view of the indoor unit body with the decorative panel removed.

  The indoor unit of the air conditioner includes an indoor unit body 1 that is inserted from a room side into a mounting opening provided on a ceiling board and is suspended and fixed to a so-called ceiling behind a hanging bolt or the like, and the indoor unit The decorative panel 2 is attached to the lower surface of the machine main body 1 and exposed from the ceiling board to the indoor side.

  The indoor unit body 1 is provided with a sheet metal casing 3 having a lower surface opened and a thin metal plate formed on a top plate and side portions. A heat insulating material made of a polystyrene foam material or the like is attached to the inner peripheral surface of the casing 3, and the entire inner peripheral surface is covered with the heat insulating material. Therefore, the indoor unit body 1 has a heat insulating structure.

  A blower 5 protected by a fan guard is disposed at a substantially central portion of the lower surface opening in the indoor unit body 1. The blower 5 includes a so-called centrifugal fan (also referred to as “turbo fan”) that sucks air from the axial direction and blows it out in the circumferential direction. Since the upper part of the blower 5 is covered with the top plate portion 1a of the indoor unit body 1 and the lower part is an opening, the lower face opening is the suction side of the blower 5.

  A heat exchanger 6 having a substantially square frame shape in a plan view is arranged so as to surround the periphery of the blower 5 on the blowing side. A drain pan 7 is provided below the heat exchanger 6, and the drain pan 7 receives drain water generated by the heat exchange action of the heat exchanger 6 during cooling operation.

  The drain pan 7 is fitted into the peripheral wall of the indoor unit main body 1 and has a recess a that is recessed toward the inside on the outer side. Further, the drain pan 7 is formed so that only one inner corner portion protrudes in the inner diameter direction, and a drain port 8 is provided on the bottom wall of the drain pan 7 at the protruding portion.

  The drain port 8 is an opening for discharging drain water, scale-like substances, etc. (hereinafter collectively referred to as “drain water”) remaining in the drain pan 7 during maintenance. The drain port 8 is closed so as to be freely opened and closed by a drain cap which is a drain plug member to be described later. 1 and 2 show a state in which the drain cap is removed from the drain port 8, and the drain pump 10 can be seen from the opened drain port 8.

That is, the drain pump 10 is provided directly above the drain port 8. In other words, the drain port 8 is provided immediately below the drain pump 10 and is attached so that the central axis of the drain pump 10 coincides with the central axis of the drain port 8.
In addition, the diameter of the drain port 8 is formed larger than the diameter of the drain pump 10, and the outer peripheral surface of the drain pump 10 can be completely seen from the drain port 8. Therefore, the drain pump 10 can be inserted into the drain port 8 by removing the drain pump 10.

An electrical component box 11 is provided in the vicinity of the drain port 8 and along a part of the inside of the drain pan 7. The electrical component box 11 accommodates electrical components that control the electrical components accommodated in the indoor unit main body 1, electrical components that perform transmission and reception with respect to the remote control, and the like.
The lower surface opening of the casing 3 is closed by the decorative panel 2 shown only in FIG. The decorative panel 2 is, for example, molded from a synthetic resin material and finished beautifully. The decorative panel 2 is exposed from the ceiling panel to the room and shields the gap between the peripheral surface of the indoor unit body 1 and the opening for mounting the ceiling panel. To do.

  A suction port 12 is opened at a substantially central portion of the decorative panel 2 and can be opened and closed by a suction grill 13 provided with a filter. FIG. 1 shows a state where the suction grill 13 is opened and the suction port 12 is exposed. FIG. 2 shows a state where the decorative panel 2 is removed from the indoor unit body 1.

If it demonstrates, the said inlet 12 will be opened in the site | part facing the air blower 5 and the inner side part of the heat exchanger 6, and has comprised the substantially rectangular shape. The suction grill 13 is detachably attached to the suction port 12.
The suction grill 13 shields the interior of the casing 3 from the suction port 12 while allowing the indoor air to flow through the suction port 12. At the time of maintenance, the filter can be removed by opening the suction grill 13 and the filter can be cleaned on the indoor floor.

  A drain port 8 provided in the drain pan 7 is located at a portion facing the suction port 12 from a location provided at one corner of the drain pan 7. Moreover, the blower outlet 15 is provided along each side part of the decorative panel 2, and this opposes the clearance gap part formed by the indoor unit main body 1 side wall and the recessed part a of the drain pan 7. As shown in FIG.

  A bell mouth 16 is provided between the decorative panel 2 and the blower 5, and is surrounded by the drain pan 7. The bell mouth 16 is formed in a horn shape having a small diameter on the blower 5 side and a large diameter on the suction port 12 side of the decorative panel 2. A part of the electrical component box 11 is shielded from the suction port 12 but retains the function of air blowing guidance.

Next, the mounting structure of the drain pump 10 will be schematically described in detail.
FIG. 3 is a schematic configuration diagram of a part of the indoor unit.
The drain pump 10 has a suction portion 10 a directed toward the drain port 8 on the lower side, and an upper end surface is attached to the pump support 17. In a state where the drain cap 18 is fitted into the drain port 8, the distance between the end surface of the suction portion 10 a of the drain pump 10 and the drain cap 18 is very small. Located in.

  That is, the suction part 10 a of the drain pump 10 is supported so as to be completely immersed in the drain water collected in the drain pan 7. The pump support 17 that supports the drain pump 10 includes a leg portion 17b that extends from the pump support portion 17a to a portion directly above, and the upper end of the leg portion 17b is connected to the top plate portion 1a that constitutes the indoor unit body 1. Installation fixed.

  On the back surface side of the drain pump 10, a discharge portion that discharges drain water sucked from the suction portion 10 a is provided, and one end portion of the drain hose 19 is connected thereto. The drain hose 19 is wound between the discharge portion and the leg portion 17b of the pump support 17, and is further routed between the upper end portion of the heat exchanger 6 and the indoor unit main body top plate portion 1a.

  That is, in the top plate portion 1a of the indoor unit body 1, a part of the heat insulating material 4 attached to the inner surface of the casing 3 is recessed, and the drain hose 19 is inserted into the recessed portion b. Although the processing to the heat insulating material 4 is necessary, since only the recessed portion b is formed, the man-hour is hardly affected. Further, no processing is required for the upper end portion of the heat exchanger 6, and there is no influence on the man-hours.

  The lower end surface of the heat exchanger 6 is placed on the jetty portion d provided integrally with the bottom wall of the drain pan 7. On the other hand, the upper end surface of the heat exchanger 6 is in contact with the heat insulating material 4 provided on the top plate portion 1 a of the indoor unit body 1. That is, the heat exchanger 6 is clamped and fixed between the indoor unit main body top plate portion 1a and the drain pan 7 from above and below.

  However, in the drain pan 7, when the jetty portion d supporting the heat exchanger 6 is provided over the entire circumference of the bottom wall of the drain pan 7, the drain water generated by the heat exchanger 6 is connected to the inner side of the jetty portion d. It will be bisected outside. On the other hand, the drain port 8 and the drain pump 10 are provided in an inner portion of the heat exchanger 6.

  The drain water generated by the heat exchanger 6 and flowing down and collected inside the jetty portion d is directly led to the drain port 8 and the drain pump 10, but the drain water collected outside the jetty portion d is collected there. As a result, it will not be led to the drain port 8 and the drain pump 10 unless it overflows the jetty portion d.

  For this reason, the jetty portion d is notched at a certain length in at least one location of the jetty portion d. That is, the jetty portion d is interrupted, and the bottom wall of the drain pan 7 is exposed at the interrupting portion e. Thereby, the drain water flowing down from the heat exchanger 6 to the outer portion of the jetty portion d is guided to the inner portion via the interruption portion e and is discharged from the drain port 8 or the drain pump 10.

Next, the drain port 8 and the drain cap 18 will be described in detail.
FIG. 4 is a perspective view in which the drain cap 18 is removed from the drain port 8.
The drain port 8 has a protrusion that is integrally provided downward along the peripheral surface, and an internal thread portion f that is a screw hole is provided on the inner peripheral wall of the protrusion. The drain cap 18 has a circular flange 18a having a diameter larger than the diameter of the drain port 8 and a screw projecting from one side surface of the flange 18a and screwed to the female thread f on the outer peripheral wall. It has a male screw part g which is a part.

  Accordingly, the drain cap 18 closes the drain port 8 by screwing and fastening the male screw portion g of the drain cap 18 to the female screw portion f of the drain port 8. A so-called screw cap structure will be adopted, and a reliable plugging operation without water leakage can be performed. Alternatively, the drain port 8 can be completely opened by screwing and removing the drain cap 18 from the drain port 8.

  A plurality of drain drain holes 22 are provided at intervals in the male thread portion g of the drain cap 18 along the circumferential direction. On the other hand, the drain screw groove f of the drain port 8 is provided with one drain drain groove 23 opened to have substantially the same size as or smaller than the drain drain hole 22.

  The drain drain groove 23 of the drain port 8 does not communicate with the drain drain hole 22 at a position where the drain cap 18 completely closes the drain port 8. When the drain cap 18 is rotated to completely open the drain port 8 and when the drain cap 18 is opened to some extent, the drain drain hole 22 communicates with the drain drain groove 23. Accordingly, the drain water in the drain pan 7 is drained through the drain drain hole 22 and the drain drain groove 23.

  If the drain drain hole 22 and the drain drain groove 23 are not provided, and the drain cap 18 is configured so that the drain cap 18 can be freely opened and closed, when the drain cap 18 is removed from the drain port 8, Drain water is discharged instantly and in large quantities from the mouth 8. Therefore, there is a possibility that the surroundings may be wet without receiving the drain water, but in the above-described configuration, since the water is gradually drained, all can be received and the surroundings are not wetted.

The packing 20 is placed on the upper surface of the flange portion 18a of the drain cap 18, and fitted into the peripheral surface of the male screw portion g with a certain margin. Next, the packing 20 will be described in detail.
5A is a plan view of the packing 20, and FIG. 5B is a cross-sectional view taken along the line BB in FIG. 5A. FIG. 6 is an enlarged cross-sectional view of the packing 20.

  The packing 20 is made of, for example, a rubber composition, and a material having a high elastic modulus is used to maintain high sealing performance. As shown in FIG. 5A, the packing 20 has a circular shape in plan view. As shown in FIGS. 5B and 6, the cross-sectional shape of the packing 20 is formed in a substantially X shape.

Specifically, the packing 20 includes a base portion 20a formed along the center of the substantially X-shaped cross section, and side portions integrally projecting in four directions at a predetermined angle from the peripheral surface of the base portion 20a. 20b. Here, the angle α between the side portions 20b protruding in the left-right oblique direction is formed larger (α> β) than the angle β between the side portions 20b protruding in the up-down oblique direction.

  One side of the side portion 20 b protruding in the diagonal direction of the packing 20 is placed on the flange portion 18 a of the drain cap 18. Since the mutual angle α of the side portions 20b protruding in the left and right oblique directions is formed wide, the posture of the packing 20 during the screwing of the drain cap 18 to the drain port 8 does not change, and the stability is good. Moreover, the tip of each side portion 20b is formed in a semicircular cross section, and this top portion is placed in a line contact state with the flange portion 18a of the drain cap 18, so that the stability is further improved.

  In the side part 20b on the inner peripheral side of the packing 20, a protruding part 20c is integrally provided along the tip of each side part 20b. This protrusion 20 c also has a substantially semicircular cross section and protrudes toward the inner diameter side of the packing 20. When the packing 20 is placed on the flange portion 18 a of the drain cap 18, the protrusion 20 c faces the base end of the male screw portion g that is the outer peripheral wall of the drain cap 18.

The packing is formed such that the thickness La of the base portion 20a formed along the center of the cross section with respect to the overall height L is 1/2 to 1 / 3L. The height dimension of each side portion 20b is the remaining half dimension obtained by subtracting the thickness dimension La of the base portion 20a from the overall height L.

  In the indoor unit of the air conditioner configured as described above, when the blower 5 is driven, the indoor air is guided to the bell mouth 16 through the suction grille 13 and the suction port 12 and sucked into the indoor unit body 1. The The room air flows through the heat exchanger 6 from the primary side of the heat exchanger 6 and is led to the secondary side after heat exchange.

  Then, the heat exchange air is blown out into the room through the blowout port 15 to harmonize the room air. In particular, during cooling operation, drain water is generated along with the heat exchange action of the heat exchanger 6, and dripped onto the drain pan 7. As time passes, the amount of drain water collected in the drain pan 7 increases, and the water level rises.

  When the float switch constantly detects the water level of the drain water in the drain pan 7 and detects that the water level of the drain water exceeds the reference maximum water level, the float switch sends a detection signal to the control unit. The control unit sends a drive signal to the drain pump 10, and the drain pump 10 sucks up drain water and discharges it to the outside through the drain hose 19.

  The drain water collected in the drain pan 7 is smoothly drained without overflowing the drain pan 7. When the float switch detects that the drain water level has gradually dropped to the lowest reference water level, a detection signal is sent to the control unit again. The control unit sends a stop signal to the drain pump 10 to stop drainage of drain water.

When all drain water remaining in the drain pan 7 is discharged during maintenance work or the like, the drain cap 18 is removed from the drain port 8.
Next, the opening / closing operation of the drain cap 18 having the packing 20 with respect to the drain port 8 will be described in detail.
FIG. 7 is a partial perspective view of the drain port 8 and the drain cap 18 showing a state where the drain cap 18 is removed from the drain port 8 and the drain port 8 is opened. FIG. 8 is a partial perspective view of the drain port 8 and the drain cap 18, showing a state in which the drain port 8 is closed with the drain cap 18.

  As described above, the drain port 8 is provided on the bottom wall of the drain pan 7 for discharging drain water remaining in the drain pan 7 due to maintenance of the drain pump 10 or the like. The drain port 8 has an internal thread portion f on the inner peripheral wall, and is provided with one drain drain groove 23.

In contrast, the drain cap 18 includes a flange portion 18a and a male screw portion g, and a packing 20 having a substantially X-shaped cross section is placed on the flange portion 18a. The male screw portion g is provided with a plurality of drain drain holes 22 at a predetermined interval.
As shown in FIG. 7, the side portion 20 b on the lower side projecting in the left-right oblique direction of the packing 20 is placed on the drain cap flange 18 a, and the side portion 20 b projecting in the up-down oblique direction on the inner peripheral side of the packing 20. Is inserted into the male thread g base end of the drain cap 18 with a margin.

  Protrusions 20c are provided at the distal ends of side portions 20b projecting in the up-down diagonal direction on the inner peripheral side of the packing 20, and these projecting portions 20 c face the male thread g base end of the drain cap 18. Since the protruding portion 20c is provided on the side portion 20b on the inner peripheral side of the packing 20, there is no problem even if the packing 20 is turned upside down and placed on the flange portion 18a of the drain cap 18. That is, workability is improved because there is no need to determine the mounting direction of the packing 20.

Furthermore, a concave portion 25 is provided along the circumferential direction at the proximal end of the male screw portion g closest to the flange portion 18 a of the drain cap 18. The recess 25 is formed in a semicircular cross section, and has a size and shape that can be fitted to a protrusion 20 c provided integrally with the side 20 b of the packing 20.
As shown in FIG. 8, after the drain cap 18 faces the drain port 8, the drain cap male screw portion g is aligned with the drain port female screw portion f, and the drain cap 18 is rotated. In the packing 20, the left and right side portions 20 b on the upper side are in contact with the bottom wall of the drain pan 7 while maintaining the state where the left and right side portions 20 b on the lower side are placed on the flange portion 18 a of the drain cap 18.

When the drain cap 18 is further rotated, the interval between the drain cap flange 18a and the bottom wall of the drain pan 7 is gradually reduced. The packing 20 undergoes elastic deformation so that the left and right side portions 20b on the upper side and the lower side receive a pressing force, and the space between the left and right side portions 20b increases.
Along with this, among the side portions 20b formed on the inner peripheral side of the packing 20, a protrusion 20c provided particularly at the tip of the lower side portion 20b is formed in the concave portion 25 provided at the drain cap male screw portion g base end. Invade.

  In a state where the drain cap 18 is completely closed, the left and right side portions 20b on the upper side and the lower side of the packing 20 are expanded to the maximum and come into contact with each other. Alternatively, they are close to the positions where they almost touch each other. At the same time, the protrusion 20c at the tip of the lower side portion 20b is fitted into the recess 25 at the base end of the drain cap male screw portion g.

  In this manner, the packing 20 having a substantially X-shaped cross section is sandwiched between the drain cap flange 18a and the bottom wall of the drain pan 7, and the left and right side portions 20b on the upper side and the lower side of the packing 20 are The drain cap collar 18a and the bottom wall of the drain pan 7 are in close contact with each other, so that water leakage from between the drain port 8 and the drain cap 18 is completely prevented, and the reliability can be improved.

  When the screwing of the drain cap 18 into the drain port 8 is somewhat weak, or even when the screwed state of the drain cap 18 is naturally loosened over a long period of use, the cross-sectional shape of the packing 20 is substantially X-shaped. Therefore, the left and right side portions 20b are elastically restored to return to the original angle α. That is, the sealing property of the packing 20 is ensured.

And the protrusion part 20c provided in the packing 20 in this state fits into the recessed part 25 provided in the drain cap 18, and the further improvement of the sealing performance with respect to the drain cap 18 of the packing 20 can be aimed at, and higher reliability. Is obtained.
Since the thickness dimension La of the base portion 20a formed along the center of the cross section is 1/2 to 1 / 3L with respect to the overall height dimension L of the packing 20, the packing 20 is the drain cap collar portion. In a state of being sandwiched between 18a and the bottom wall of the drain pan 7, the necessary thickness as the packing 20 can be secured, and the sealing performance is secured.

For example, if the thickness dimension La of the base portion 20a is set to be larger than 1/2 with respect to the overall height dimension L of the packing 20, the necessary tightening thickness for the packing 20 cannot be taken, and an unstable sealing state is obtained. Become.
Further, if the thickness dimension La of the base portion 20a is set to be smaller than 1/3 with respect to the overall height dimension L of the packing 20, the drain cap 18 must be tightened excessively, which is also an unstable sealing state. It becomes. The above is derived from the results of repeated experiments.

  At the time of maintenance work on the drain pump 10, the drain cap is rotated in the reverse direction and removed from the drain port 8. The packing 20 is also removed while being placed on the flange portion 18a of the drain cap 18. Since the pressing force with respect to the packing 20 is eliminated, the original cross-section is restored to the original X shape at an early stage.

  When the drain cap 18 is screwed into the drain port 8 again after the maintenance work is completed, the packing 20 is elastically deformed as described above to form a seal. Even if it is used for a long period of time, there is no influence of secular change from the cross-sectional shape, and sufficient sealing performance can be secured and reliability can be obtained.

  In addition, a structure in which the drain cap 18 is screwed into the drain port 8, a protrusion 20 c is provided on the side 20 b of the packing 20 so as to be fitted into the recess 25 provided in the drain cap 18, and the packing 20 is provided. From conditions such as setting of the base 20a thickness dimension La with respect to the overall height L, a more reliable seal is achieved, contributing to further improvement in reliability.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments.

The perspective view in the state which looked up at the indoor unit of the air conditioner based on one embodiment in this invention. The bottom view of the indoor unit main body which removed the decorative panel based on the embodiment. Sectional drawing of the outline of a part of indoor unit main body based on the embodiment. The perspective view of a drain pan part and drain cap based on the embodiment. The top view of packing based on the embodiment, and sectional drawing which follows a BB line. The expanded sectional view of packing based on the embodiment. The perspective view of a part of each in the state which removed the drain cap from the drain port based on the embodiment. The partial perspective view of the state which fitted the drain cap into the drain port based on the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Indoor unit main body, 6 ... Heat exchanger, 7 ... Drain pan, 10 ... Drain pump, 8 ... Drain port, 18 ... Drain cap (drain plug member), 20 ... Packing, 20a ... Gutter part, g ... Male screw part ( Threaded part), f ... Female threaded part (screw hole part), 20a ... Base of packing, 20b ... Side of packing, 20c ... Projection, 25 ... Recessed part.

Claims (1)

An indoor unit body that is a housing;
A heat exchanger housed inside the indoor unit body,
A drain pan provided at the bottom of the heat exchanger and receiving drain water generated by the heat exchanger;
A drain pump that pumps the drain water collected in the drain pan and discharges it to the outside;
A drain port provided at the bottom wall portion of the drain pan for discharging drain water remaining in the drain pan;
A drain plug member that freely closes and opens the drain port;
A packing that is sandwiched between the drain plug member and the bottom wall of the drain pan and prevents leakage of drain water from between the drain port and the drain plug member, and has a cross-section formed in an approximately X shape. And
The packing is composed of a base portion formed along the center of the cross section, and side portions integrally projecting in four directions at a predetermined angle from the peripheral surface of the base portion,
The packing includes a protrusion that integrally protrudes along the tip of the inner peripheral side,
The drain plug member includes a recess in the outer peripheral wall,
The packing is characterized in that the protrusion of the packing fits into the recess of the drain plug member while being sandwiched between the flange portion of the drain plug member and the bottom wall of the drain pan. Air conditioner indoor unit.

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