WO2008056602A1

WO2008056602A1 - Drain connection device for air conditioner

Info

Publication number: WO2008056602A1
Application number: PCT/JP2007/071375
Authority: WO
Inventors: Shinji Nagaoka; Takahiko Oko
Original assignee: Daikin Industries, Ltd.
Priority date: 2006-11-06
Filing date: 2007-11-02
Publication date: 2008-05-15
Also published as: JP4640317B2; JP2008116127A

Abstract

A drain connection device enhancing work efficiency in drain hose connection work. This is achieved by improving work efficiency in connecting the drain hose to a connection tube part for draining water from a drain pan, preventing water leakage after the connection, and making the drain hose not easily come out during the connecting operation. Projections (21 to 24) are formed on the outer peripheral surface of a cylindrical sleeve (20) loosely fitted in the cylindrical connection part (10) of the drain hose (4). When the drain hose (4) is pulled with the connection tube part (3) press-fitted in the sleeve (20), the projection surface (15) of the drain hose (4) at the forward end of the connection part (10) is in contact with the forward end surface of the projection (21) of the sleeve (20). The inner peripheral surface of the connection part (10) and the outer peripheral surface of the projection (21) receive surface pressure, and projection surface (15) at the forward end of the connection part (10) is in intimate contact with the forward end surface of the sleeve (20) on the projection (21) side. Thus, the projection surface (15) seals the projection (21) of the sleeve (20).

Description

Specification

Drain connection device for air conditioner

Technical field

TECHNICAL FIELD [0001] The present invention relates to a drain connection device for an air conditioner that drains condensed water from a drain pan of an indoor unit through a drain hose.

Background art

[0002] An air conditioner is composed of an outdoor unit installed outdoors and an indoor unit installed on a wall surface or the like on the indoor side. In this indoor unit, drain water condensed by a heat exchanger is formed. A drain pan is provided to store the water. The drain pan is provided with a connecting cylinder portion for drainage, and a drain hose for drainage is connected to the connecting cylinder portion.

[0003] As conventional examples in which a drain hose is connected to the drainage connecting cylinder portion, for example, Patent Document 1 (JP-A-5-196245), Patent Document 2 (JP-A-2004-93049) ) And Patent Document 3 (Japanese Patent Laid-Open No. 9-112948).

[0004] In Patent Document 1 described above, the drain hose is formed in a bellows shape, and in the vicinity near the connection point with the drain pan, the bellows-like ridge is set deeper than the other portions, and the drain hose expansion capability in this vicinity is set. Has increased. As a result, when a tensile external force acts on the drain hose in the vicinity of the connection with the drain pan, the extension of the drain hose due to this tension is absorbed in the vicinity, and the drain hose breaks or comes off the drain pan. It is prevented from doing.

[0005] Also, in Patent Document 2, an operation fitting protruding in the front direction of the air conditioner is provided near the connection end of the drain hose to the drain pan, and a locking hole is drilled in the operation fitting. The operation fitting is fixed to the drain pan by inserting a screw into the hole. As a result, the drain pan and drain hose can be easily and safely detached.

[0006] Further, in Patent Document 3, an engagement claw is provided at a drain discharge port of a drain pan disposed below the heat exchanger, and an engagement claw provided on a connection port member of the drain hose Due to this, the drain hose is fixedly connected to the drain outlet with one touch. This As a result, the drain hose is firmly installed in the drain pan without using any accessory parts for fixing the drain hose.

Disclosure of the invention

Problems to be solved by the invention

[0007] However, Patent Document 1 has a problem that the drain hose is easily detached and water leakage easily occurs because the drain hose is simply connected to the drain pan. In Patent Document 2, since the operation fitting is fixed to the drain pan with screws, there is a problem that a screw tightening process is required, the number of work steps is increased, and the workability of assembly is inferior. In addition, since screws are used, the number of parts increases. Further, in Patent Document 3, although the drain hose can be fixed with one touch, there is a problem that a mold for manufacturing a part has a complicated structure.

[0008] Further, when explaining other background art (which is described for convenience of explaining the problem of the present invention, and this background art is not publicly known, it is not prior art), this is a drain hose. In this structure, a rubber sleeve is interposed at the connecting portion between the connecting tube portion and the connecting cylinder portion, and a ring-shaped fixing bracket is wound around the sleeve and screwed. In this structure, when the drain hose is assembled to the connecting cylinder part provided in the drain pan, the rubber hose inserted inside the drain hose is hard, so the drain hose is assembled to the connecting cylinder part. There is a problem that it is difficult. Therefore, in order to improve the assembly of the drain hose to the connecting cylinder part, if the inner diameter of the sleeve is increased, a gap will be generated between the inner peripheral surface of the sleeve and the outer peripheral surface of the connecting cylinder part, causing water leakage, If the drain hose is pulled during connection, the drain hose may come off from the connecting cylinder. In addition, since fixing brackets are attached and screwed to prevent this from coming off, fixing brackets and screws are required as separate parts, increasing the number of parts and increasing the number of assembly steps. .

[0009] The present invention has been made to solve the above-described conventional problems, and provides a drain connection device for an air conditioner that can achieve at least the following objects.

(1) Improved workability for connecting the drain hose to the connecting cylinder for drainage from the drain pan Make it.

(2) Improve quality by preventing water leakage after connection.

(3) Improve the connection workability by preventing the drain hose from being easily detached during the connection work.

(4) To reduce costs by reducing the number of man-hours and parts by eliminating fixtures and screws that were previously required separately.

Means for solving the problem

[0010] In order to solve the above problems,

A drain connection device of an air conditioner for connecting a leading end portion of a drain hose to a connecting cylinder portion for drainage provided in a drain pan of an indoor unit,

A substantially cylindrical connecting portion formed at the tip of the drain hose;

A substantially cylindrical sleeve made of an elastic material;

With

The sleeve has at least one protrusion that protrudes radially outward and extends in the circumferential direction on the outer periphery;

The sleeve is loosely fitted inside the connecting portion of the drain hose,

The connecting portion of the drain hose has an engaging portion that comes into contact with the protruding portion of the sleeve when the sleeve moves relative to the drain hose toward the leading end side of the drain hose, and the connecting tube is provided in the sleeve. When the drain hose is moved away from the connecting tube portion in a state where the portion is inserted and the inner peripheral surface of the sleeve is crimped to the outer peripheral surface of the connecting tube portion, the connecting tube portion And the engagement portion of the connecting portion compresses and seals the protruding portion of the sleeve, and the tip end portion of the drain hose is fluid-tightly connected to the connecting cylinder portion. An air conditioner drain connection device is provided.

[0011] According to the drain connection device for an air conditioner of the present invention, in a state where the connecting cylinder portion is inserted into the sleeve and the inner peripheral surface of the sleeve is crimped to the outer peripheral surface of the connecting cylinder portion, By pulling the drain hose to the opposite side of the connecting cylinder, the drain hose 4 can be securely connected and fixed to the connecting cylinder. [0012] Therefore, the workability of connecting the drain hose to the connecting tube portion is improved, and water leakage is simultaneously prevented by the close contact between the protrusion and the engaging portion of the drain hose connecting portion. The quality is improved and the occurrence of defects is suppressed.

[0013] In addition, in the operation of connecting the drain hose to the connecting cylinder portion, as described above, the drain hose is firmly connected and fixed to the connecting cylinder portion by a simple operation, so that the drain hose can be easily detached. It is possible to improve the connection workability.

[0014] In one embodiment,

The inner peripheral surface of the drain hose connection portion is a tapered surface that decreases in diameter toward the tip side.

The tapered surface is at least a part of the engaging portion.

[0015] According to the embodiment, since at least a part of the engaging portion is formed by the tapered surface, it is easy to manufacture and at the same time a reliable connection state is obtained.

[0016] Further, according to the embodiment, since the inner diameter of the drain hose connection portion is formed in a tapered shape so that the diameter decreases toward the distal end side, the sleeve is inserted or press-fitted into the connecting cylinder portion. Can be facilitated and workability can be improved.

[0017] In one embodiment,

The connecting portion of the drain hose protrudes radially inward on the inner peripheral side, and has a protruding surface that contacts the end surface of the protruding portion of the sleeve,

The protruding surface is at least a part of the engaging portion.

[0018] According to the embodiment, since at least a part of the engaging portion is configured by the projecting surface, manufacturing is easy and at the same time a reliable connection state is obtained.

[0019] In particular, when the engaging portion 1 is composed of both the tapered surface and the projecting surface, it is possible to connect more firmly and the sealing performance is improved.

[0020] One embodiment is:

Comprising the connecting cylinder part;

The outer diameter of the connecting cylinder portion becomes smaller as it reaches the tip side!

[0021] According to the embodiment, since the outer diameter of the connecting cylinder part is made smaller toward the distal end side, the sleeve can be easily inserted into or pressed into the connecting cylinder part. Sex Improve with power S

[0022] In one embodiment,

The sleeve has a convex portion protruding inward in the radial direction and extending in the circumferential direction on the inner peripheral portion.

[0023] According to the embodiment, since the convex portion is provided around the inner peripheral surface of the sleeve, the connection and fixing between the sleeve and the connecting cylinder portion is further strengthened, and the drain hose is connected to the connecting cylinder portion. Make it hard to escape!

[0024] In one embodiment,

The protrusion is formed at the tip of the sleeve,

The protruding surface is formed at the tip of the connecting portion.

[0025] According to the embodiment, since the amount of elastic deformation of the protrusion can be increased, the connection and fixing can be further strengthened, the water tightness can be improved, and water leakage can be prevented more reliably.

[0026] In one embodiment,

The sleeve is provided with a plurality of the protrusions.

[0027] According to the embodiment, since the outer peripheral surface of the plurality of protrusions and the inner peripheral surface of the connection portion of the drain hose are in contact with each other, it is possible to more firmly fix the connection and improve water tightness, Water leakage can be prevented more reliably.

[0028] In one embodiment,

The sleeve is made of rubber.

[0029] According to the embodiment, since the sleeve is made of rubber, it is easy to obtain the material of the sleeve, which is suitable for implementation.

Brief Description of Drawings

FIG. 1 is a perspective view of a main part of an indoor unit in an embodiment of the present invention.

FIG. 2a is a side view of the distal end portion of the drain hose in the embodiment of the present invention.

FIG. 2b is a front view of the distal end portion of the drain hose in the embodiment of the present invention.

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2a in the embodiment of the present invention.

FIG. 4a is a side view of the sleeve in the embodiment of the present invention. FIG. 4b is a front view of the sleeve in the embodiment of the present invention.

FIG. 5 is a cross-sectional view taken along the line BB of FIG. 4a in the embodiment of the present invention.

FIG. 6a is an operation explanatory diagram when the drain hose in the embodiment of the present invention is connected to the connecting cylinder portion.

FIG. 6b is an operation explanatory diagram when the drain hose in the embodiment of the present invention is connected to the connecting cylinder portion.

FIG. 6c is an operation explanatory diagram when the drain hose in the embodiment of the present invention is connected to the connecting cylinder portion.

FIG. 6d is an operation explanatory diagram when the drain hose in the embodiment of the present invention is connected to the connecting cylinder portion.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a main part of the indoor unit 1, and a drain pan 2 for storing condensation generated in the heat exchanger is disposed below the heat exchanger (not shown) of the indoor unit 1. RU An end portion of the drain pan 2 is provided with a substantially cylindrical connecting tube portion 3 protruding backward, and the tip end portion of the bellows-shaped drain hose 4 is connected to the connecting tube portion 3. Yes.

FIG. 2a shows a side view of the distal end portion of the drain hose 4, and FIG. 2b shows a front view. Fig. 3 is a cross-sectional view taken along line AA in Fig. 2a. As a whole, a flexible cylindrical drain hose 4 has a substantially cylindrical connecting portion 10 formed at the tip of the bellows-like portion 12, and the tip 11 on the tip side of the connecting portion 10 is It is shaped to expand outward so that it can be easily inserted into the connecting cylinder part 3. Further, the connecting portion 10 itself has rigidity, and is formed in a tapered shape that gradually increases in diameter from the tip portion 11 side to the bellows-like portion 12. In particular, as shown in FIG. 3, the inside of the connection portion 10 is formed such that the diameter increases as the space portion 13 approaches the bellows-like portion 12. That is, conversely, the connecting portion 10 is formed in a tapered shape having a diameter that decreases toward the distal end side, and an inner peripheral surface thereof is a tapered surface 17. Further, at the distal end portion of the connecting portion 10 of the drain hose 4, a protruding surface 15 that protrudes radially inward on the inner peripheral side and abuts on an end surface of a protruding portion 21 of a sleeve 20 described later is formed. . The tapered surface 17 and the projecting surface 15 constitute an engaging portion 16 having a function described later. [0033] FIGS. 4a, 4b and 5 show a sleeve 20 which is loosely arranged inside the connecting portion 10 of the drain hose 4, FIG. 4a is a side view of the sleeve 20, and FIG. 4b is a front view. Each is shown. FIG. 5 is a cross-sectional view taken along the line BB in FIG. 4a. For example, four protrusions 21, 22, 23, 24 are provided at predetermined intervals on the outer peripheral surface of a substantially cylindrical sleeve 20 made of rubber and other living bodies. As shown in FIG. 5, a first convex portion 25 and a second convex portion 26 having a substantially triangular shape such as a right triangle are provided on the inner peripheral surface of the inner peripheral surface. The first convex portion 25 is formed at a substantially central portion of the sleeve 20 in the axial direction, the second convex portion 26 is formed larger than the first convex portion 25, and is adjacent to the protruding portion 24 (connection of the drain hose 4). It is formed at the back of part 10. Since the sleeve 20 itself is made of rubber, the sleeve 20 itself has elasticity, and the protrusions 2 !! to 24 and the first and second protrusions 25 and 26 naturally have elasticity. Have.

Here, the outer diameter and length of the sleeve 20 are formed smaller than the outer diameter and length of the connecting portion 10 of the drain hose 4 as shown in FIG. 6a. The connecting tube portion 3 on the drain pan 2 side to which 4 is connected has a tapered portion 5 having a diameter smaller toward the tip. Note that the sleeve 20 is made of rubber, and its outer diameter and length are smaller than the outer diameter and length of the connection portion 10 of the drain hose 4. Even if the protruding surface 15 is provided, the sleeve 20 can be easily inserted into the connecting portion 10. At this time, the protruding surface 15 of the connecting portion 10 functions to prevent the sleeve 20 from coming off.

[0035] Next, the operation of connecting the drain hose 4 to the connecting cylinder portion 3 will be described with reference to Figs. 6a, 6b, 6c, and 6d. First, as shown in FIG. 6 a, the opening portion of the distal end portion 11 of the drain hose 4 is inserted into the connecting tube portion 3. Here, the outer diameter of the connecting tube portion 3 is set to be substantially the same as or slightly larger than the inner diameter of the sleeve 20. When the connecting part 10 of the drain hose 4 is inserted into the connecting cylinder part 3, the sleeve 20 is press-fitted into the connecting cylinder part 3. At this time, as shown in FIG. 6b, the outer peripheral surface of the connecting tube portion 3 is press-fitted into the inner peripheral surface of the sleeve 20, and the sleeve 20 is moved to the back of the connecting portion 10 by the surface pressure. When the sleeve 20 is moved to the back, the back end surface of the sleeve 20 including the back-side protruding portion 24 of the sleeve 20 comes into contact with the stopper portion 14 formed in the stepped shape of the connecting portion 10, and the sleeve 20 20 movements are restricted and stop. [0036] Further, when the connecting part 10 of the drain hose 4 is pushed toward the connecting cylinder part 3, the connecting cylinder part 3 is pressed into the sleeve 20 as shown in FIG. 6c. Elongates to the outer diameter side and the inner diameter of the sleeve 20 increases. In addition, the protrusion 24 at the back end of the sleeve 20 extends to the outer diameter side, but the end of the connection part 10 has a tapered shape with a large diameter, and the protrusion 24 etc. expands in the internal space 13. Workability is improved by using it as a space. Further, when the connecting cylinder portion 3 is press-fitted into the sleeve 20, the first convex portion 25 and the second convex portion 26 are brought into close contact or pressure contact with the outer peripheral surface of the connecting cylindrical portion 3 in sequence, and the sleeve 20 is connected to the connecting cylindrical portion 3 It will be firmly fixed to.

Next, as shown in FIG. 6d from the state of FIG. 6c, the drain hose 4 is pulled toward the bellows-shaped part 12 side (that is, the direction in which the drain hose 4 comes out of the connecting cylinder part 3). When the drain hose 4 is pulled, the protruding surface 15 at the tip of the connecting portion 10 of the drain hose 4 hits the leading end surface of the protruding portion 21 of the sleeve 20. At this time, the inner peripheral surface of the connecting portion 10 and the outer peripheral surface of the protruding portion 21 are subjected to surface pressure, and the protruding surface 15 at the distal end of the connecting portion 10 is in close contact with the distal end surface of the sleeve 20 on the protruding portion 21 side. . In this state, the sleeve 20 is compressed in the axial direction, and the sleeve 20 is compressed between the inner peripheral surface of the connecting portion 10 of the drain hose 4 and the outer peripheral surface of the connecting cylindrical portion 3, so that the connecting cylindrical portion 3 The surface pressure against increases. As a result, the drain hose 4 including the sleeve 20 is firmly fixed to the connecting cylinder part 3, and the drain hose 4 is restricted from coming out of the connecting cylinder part 3. That is, the projecting portion 21 of the sleeve 20 is sealed with the outer peripheral surface of the connecting tube portion 3, the inner peripheral surface of the connecting portion 10, and the projecting surface 15 of the connecting portion 10, whereby the drain hose is connected to the connecting tube portion 3. The tip of 4 is connected. The reason for this will be described. The pressing force from the projecting surface 15 compresses the vicinity of the projecting portion 21 of the sleeve 20, and this portion is elastically deformed radially outward and radially inward. With this force, the protrusion 21 and the vicinity thereof are pressed against the tapered surface 17 of the connecting portion 10 and the outer peripheral surface of the connecting tube portion 3, but even if the tensile force of the drain hose 4 is released in this state, The elastic deformation of the protrusion 21 and the vicinity thereof is caused by frictional forces between the protrusion 21 and the vicinity thereof, the outer peripheral surface of the connecting tube portion 3, the tapered surface 17 of the connecting portion 10, and the protruding surface 15 of the connecting portion 10. This state is maintained without being restored, and in this specification, such a state is referred to as “pressing”. From this state, even if the drain hose 4 is further pulled, the amount of elastic deformation increases and the “seal amount” increases. It becomes difficult to escape.

Here, the above-described sealed state will be further described. In the above embodiment, in the connection portion 10 of the drain hose 4, both the tapered surface 17 and the protruding surface 15 are the engaging portions 16. Is used to perform the sealing function by contacting the protrusion 21. However, even when the projecting surface 15 does not contact the projecting portion 21 and only the tapered surface 17 contacts the projecting portion 21, the sealed state can be obtained. Therefore, the engaging portion 16 can be configured with only the tapered surface 17. In this case, the projecting surface 15 serves to prevent the sleeve 20 from coming out of the connecting portion 10 in the initial state of FIG. 6a. It is also possible to form the engaging portion 16 that seals the protruding portion 21 with only the protruding surface 15 without providing the tapered surface 17 (the inner peripheral surface of the connecting portion 10 is formed in a cylindrical shape). . However, when the engaging portion 16 is composed of both the tapered surface 17 and the projecting surface 15 as in the embodiment, there is an advantage that water leakage can be reliably prevented and connection fixation can be performed firmly. .

In the above embodiment, the outer peripheral surface of the projection 21 of the sleeve 20 and the inner peripheral surface of the connection portion 10 of the drain hose 4, and the tip end surface of the sleeve 20 including the projection 21 and the connection portion 10 It is in close contact with the projecting surface 15 at the tip at two power points, thereby preventing water leakage. Therefore, in order to prevent water leakage, the force that conventionally used fixing brackets and screws has been used. In this embodiment, fixing brackets and screws are used! Reductions can be made and costs can be reduced. In addition, since the outer peripheral surfaces of the plurality of projections 21... 24 are in pressure contact with the inner peripheral surface of the connecting portion 10, water leakage can be prevented more reliably in this respect.

Thus, in the present embodiment, the connecting portion 10 of the drain hose 4 is inserted into the connecting tube portion 3, and the drain hose 4 is connected to the connecting tube portion at a position where insertion of the drain hose 4 is restricted. The drain hose 4 can be securely connected and fixed to the connecting tube 3 by a simple operation of pulling to the opposite side of 3. Therefore, the connection workability of the drain hose 4 to the connecting cylinder part 3 is improved, and water leakage is prevented at the same time by the close contact between the outer peripheral surface of the projection 21 and the inner peripheral surface of the connection part 10 of the drain hose 4. As a result, quality is improved and complaints from the factory are also reduced. In addition, in the operation of connecting the drain hose 4 to the connecting cylinder part 3, the drain hose 4 is firmly connected and fixed to the connecting cylinder part 3 as described above, so that the drain hose 4 cannot be easily disconnected. Product You can improve your work.

[0041] Since the tip end surface of the protrusion 21 of the sleeve 20 and the protrusion surface 15 of the connection portion 10 of the drain hose 4 are in close contact, the outer peripheral surface of the protrusion 21 and the inner peripheral surface of the connection portion 10 are Water leakage can be completely prevented at the close contact portion and the close contact portion between the tip end surface of the protrusion 21 and the close contact portion between the protruding surface 15 of the connecting portion 10. Further, since the tapered portion 5 is formed such that the outer diameter of the connecting tube portion 3 decreases toward the tip side, the sleeve 20 can be easily inserted into or pressed into the connecting tube portion 3 to improve workability. Can be improved.

[0042] Further, since the first convex portion 25 and the second convex portion 26 are provided around the inner peripheral surface of the sleeve 20, the connection and fixing between the sleeve 20 and the connecting cylinder portion 3 are further strengthened and connected. The drain hose 4 is pulled out from the tube 3. Any one of the first convex portion 25 and the second convex portion 26 may be provided, but it is preferable to provide two or more. Also, the outer surface of the sleeve 20 is provided with four protrusions 2;! To 24. Only the protrusion 21 at the front end may be used. Also, the width of the protrusion 21 is made wider than in the illustrated example, and the drain hose 4 The surface pressure with the inner periphery of the connecting portion 10 may be further increased, or water leakage may be further prevented.

Claims

The scope of the claims

[1] A drain connection device for an air conditioner that connects the drain hose ( ₄ ) to the drainage connecting cylinder (3) provided in the drain pan (2) of the indoor unit (1),

A substantially cylindrical connecting portion (10) formed at a tip portion of the drain hose (4), a substantially cylindrical sleeve (20) made of an elastic body, and

With

The sleeve (20) has at least one protrusion (21) that protrudes outward in the radial direction and extends in the circumferential direction on the outer peripheral portion;

The sleeve (20) is loosely fitted inside the connecting portion (10) of the drain hose (4),

The connecting portion (10) of the drain hose (4) is arranged so that the sleeve (20) moves when the sleeve (20) moves relative to the drain hose (4) toward the distal end of the drain hose (4). Having an engaging part (16) in contact with the protrusion (21);

The connecting cylinder part (3) is inserted into the sleeve (20), and the inner peripheral surface of the sleeve (20) is crimped to the outer peripheral surface of the connecting cylinder part (3). And when the drain hose (4) is moved in a direction away from the connecting tube portion (3), the connecting tube portion (3) and the engaging portion (16) of the connecting portion (10) Then, the protrusion (21) of the sleeve (20) is compressed and sealed, and the tip of the drain hose (4) is fluid-tightly connected to the connecting cylinder (3). A drain connection device for an air conditioner.

[2] The drain connection device for an air conditioner according to claim 1! /,

The inner peripheral surface of the connection portion (10) of the drain hose (4) is a taper surface (17) that decreases in diameter toward the tip side.

The tapered surface (17) is at least a part of the engaging portion (16). A drain connection device for an air conditioner.

[3] In the air conditioner drain connection device according to claim 1 or 2,

The connecting portion (10) of the drain hose (4) protrudes radially inward on the inner peripheral side, and has a protruding surface (15) that contacts the end surface of the protruding portion (21) of the sleeve (20). Have

The projecting surface (15) is at least a part of the engaging portion (16). Air conditioner drain connection device.

[4] In the air conditioner according to any one of claims 1 to 3,

Comprising the connecting tube portion (3),

The drain connection device for an air conditioner, wherein an outer diameter of the connecting tube portion (3) decreases toward the tip end side.

[5] In the air conditioner according to any one of claims 1 to 4,

The drain connection device for an air conditioner, wherein the sleeve (20) has a convex portion (25) (26) projecting inward in the radial direction and extending in the circumferential direction on an inner peripheral portion.

[6] In the air conditioner drain connection device according to claim 3,

The protrusion (21) is formed at the tip of the sleeve (20),

A drain connection device for an air conditioner, wherein the projecting surface (15) is formed at the tip of the connection portion (10)! /.

[7] In the air conditioner according to any one of claims 1 to 6,

A drain connection device for an air conditioner, wherein the sleeve (20) is provided with a plurality of the protrusions (21, 24) arranged side by side.

[8] In the air conditioner according to any one of claims 1 to 7,

A drain connection device for an air conditioner, wherein the sleeve (20) is made of rubber.