JP3868732B2 - Tube connection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packing suitable for use in a receiving port of a pipe connection portion between a drain pan drain pipe and a drain hose in an indoor unit of an air conditioner, for example, and a pipe connection portion using this packing.
[0002]
[Prior art]
In an air conditioner indoor unit, condensed drain water is once collected in a drain pan and discharged from the drain pan to the outside by a flexible hose (drain hose). When connecting the pipe part and the drain hose, it is required to be easy to insert the drain hose, difficult to pull out, and excellent water tightness.
[0003]
Conventionally, as shown in FIG. 4, a drain hose in which an O-ring 42 is fitted to a tip receiving portion 41 of a bellows-like resin hose 40 is known. However, in many cases, the drain pipe section is tapered by 2 to 3 ° in consideration of injection molding problems, particularly releasability from the mold, and the tapered pipe body is tapered toward the tip. Therefore, when connecting a conventional drain hose to this, it is easy to insert into the drain pipe, but if force is applied in the direction of removal, it will easily fall out and drain water will leak into the room. There was a problem.
[0004]
[Problems to be solved by the invention]
In view of the above problems, the present invention is easy to fit between a receiving port formed at an end of a drain hose or the like and an insertion port such as a drain pipe, has a strong retaining force, and is excellent in water tightness. It is an object to provide a pipe connecting method .
[0005]
[Means for Solving the Problems]
To solve the above problems, pipe connection method according to claim 1, wherein, via a packing which is fitted to one of the tube A and the other tube B into socket inner peripheral surface of the tube B end The packing has a substantially cylindrical shape as a whole, the tip is formed in an annular bulging portion that fits into the packing holding portion of the receiving portion, and the intermediate portion is formed in a thin straight cylindrical portion. The rear end portion is formed into a thick tapered portion that gradually increases in thickness toward the outer diameter direction of the tapered portion that fits the outwardly expanding tapered portion of the receiving portion, and the thick tapered portion and the rear end inner diameter of the inner peripheral surface is formed in a substantially equal to or smaller than the dimension between the tip outer diameter of the spigot portion of the tubular body a, the pipe B to the outer peripheral surface of the distal end portion of the tube a end By fitting the taper taper into the outer side of the tapered portion that gradually decreases the outer diameter, the annular bulging portion is The thick taper portion is pushed in while enlarging the inner diameter of the thin tube, and the thin straight tube portion is stretched in the axial direction. When the end of the tube A is inserted to the rear end of the thick tapered portion and the connection is completed, the packing is taper-fitted to the outer peripheral surface of the insertion portion. It is characterized in that it is in close contact with each other.
[0006]
Further, pipe connection method according to claim 2, in claim 1, in drainage pipe section in which one of the tube A is integrally projected from the drain pan of the air conditioner, the other tube B a flexible drain hose It is characterized by being.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 shows a state before one tube A and the other tube B are connected, FIG. 2 shows a state in the middle of connection between the tubes A and B, and FIG. 3 shows a connection completed state of the tubes A and B. .
[0009]
The pipe body A is a drain pipe section (insertion section) 10 integrally projected from a synthetic resin drain pan body of an air conditioner (not shown), and the outer peripheral surface thereof is tapered to gradually decrease the outer diameter toward the tip section 11. The taper surface 12 is formed.
[0010]
The tube B is a flexible drain hose 20 in which a main body bellows portion 21 and an end receiving portion 22 are integrally formed of a synthetic resin (for example, a polyolefin-based resin). A heat insulating cover (not shown) is covered. The receiving portion 22 is a portion where the packing 30 is fitted on the inner peripheral surface thereof, a packing holding portion 23 in which an annular concave portion is formed on the inner peripheral surface of the tip, a groove portion 24 for fitting a C ring, and an outwardly expanding taper portion 25. It consists of and.
[0011]
The packing 30 is a short, substantially cylindrical shape made of rubber, soft resin, or the like, and has an annular bulging portion 31 that is formed at the tip portion and fits with the packing holding portion 23 of the drain hose 20, and a thin straight cylindrical portion that is formed at the intermediate portion. 32, and a thick tapered portion 33 that is formed at the rear end portion and fits to the outwardly expanding tapered portion 25 of the drain hose 20. The thick taper portion 33 extends from the thin straight cylindrical portion 32 and is gradually increased in thickness in the outer diameter direction and the inner diameter direction, and the taper angle θ is formed at 12 °. The outwardly expanding taper portion 25 is slightly longer in the axial direction than the thick taper portion 33.
[0012]
In this embodiment, the inner diameter of the annular bulging portion 31 of the packing 30 is set to a dimension D substantially the same as the outer diameter of the front end of the drainage pipe section 10, and the rear end inner diameter D ′ of the thick-walled taper section 33 is set to a size smaller than the above D. However, the inner peripheral surface of the thick tapered portion 33 may be the same smooth surface as the thin straight cylindrical portion 32, and the rear end inner diameter D 'may be formed to have substantially the same dimensions as D. Reference numeral 26 denotes a metal C-ring that prevents creep cracks due to deterioration of the drain hose over time.
[0013]
As shown in FIG. 2, when the drain hose 20 is fitted to the outside of the drain pipe portion 10, first, the annular bulging portion 31 of the packing 30 expands its inner diameter along the tapered surface 12 from the tip portion 11. Then, the thin straight tube portion 32 is also pushed on the tapered surface 12 in the same manner. At this time, the thin straight tube portion 32 is forced to be stretched in the axial direction. When reaching 33, the thick tapered portion 33 is retracted from the original position, and a slight gap h is formed between the thickened tapered portion 25 and the outwardly expanding tapered portion 25.
[0014]
Therefore, even if the insertion operation is continued thereafter, the thick tapered portion 33 has a margin to expand in the outer diameter direction, and a great amount of force is required until the distal end portion 11 is completely inserted into the rear end of the thick tapered portion 33. It is possible to fit smoothly without requiring. In the connection completion state of the pipe bodies A and B shown in FIG. 3, the packing 30 and the drain pipe portion 10 are in close contact so that the former bites into the latter surface by taper fitting, and good watertightness is maintained.
[0015]
Further, even if a force acts in the direction of pulling out the tubular bodies A and B, the thin-walled straight cylindrical portion 32 tries to return to its original thickness even when compressed in the axial direction, and the thick-walled tapered portion 33 exhibits a wedge effect. Therefore, the connection part does not easily come off. In addition, when the taper angle of the thick-wall taper part 33 was set to 12 degrees, it was confirmed that the extraction force increases about 1.4 times with respect to the insertion force.
[0016]
Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration of the present invention is not limited to the illustrated embodiments, and design changes within the scope of the present invention are included in the present invention. It is. For example, the tubular bodies A and B are not limited to those for the above-mentioned uses, and may be rigid pipes such as a sewer pipe, and the shape such as the taper angle of the packing 30 can be appropriately selected.
[0017]
【The invention's effect】
In the present invention, the insertion port can be easily inserted into the receiving port beyond the packing. Further, since the inner peripheral surface of the packing is strongly pressed against the outer peripheral surface of the insertion opening, water tightness is excellent. Furthermore, the pulling force is extremely large due to the wedge effect of the packing and does not easily come off.
[Brief description of the drawings]
FIG. 1 is a cross-sectional front view showing a connection portion of the present invention before connection.
FIG. 2 is a front view of an upper half cutout showing a connection halfway process of a connecting portion of the present invention.
FIG. 3 is an upper half cutaway front view showing a connection completion state of the connection portion of the present invention.
FIG. 4 is a sectional front view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Connection pipe part 11 Tip part 12 Tapered surface 20 Drain hose 21 Main body bellows part 22 Receiving part 23 Packing holding part 24 Groove part 25 Outward taper part 30 Packing 31 Tip fitting part 32 Thin straight cylinder part 33 Thick taper part

Claims (2)

One tube A And the other tube B And the tube B It is a method of connecting via a packing fitted to the inner peripheral surface of the receiving part of the end part,
The packing has a substantially cylindrical shape as a whole, a tip portion is formed in an annular bulging portion that fits into the packing holding portion of the receiving portion, a middle portion is formed in a thin straight cylindrical portion, and a rear end portion is formed in the above The rear end inner diameter of the inner peripheral surface of the thick tapered portion is formed in a thick tapered portion that gradually increases in thickness toward the outer diameter direction of the outer tapered portion that fits to the outer expanding tapered portion of the receiving portion. The tube A It is formed in a dimension that is approximately equal to or smaller than the outer diameter of the tip of the insertion port,
Tube B The tube A By fitting the outer peripheral surface of the end portion to the outer side of the tapered tapered insertion portion that gradually decreases the outer diameter toward the tip portion,
The annular bulge is pushed in while expanding its inner diameter,
The thick-walled taper portion can be expanded in the outer diameter direction due to a gap generated between the thin-walled straight tube portion and the outer-expanding taper portion by retreating from the initial position by extending the thin-walled straight tube portion in the axial direction. ,
Tube A By inserting the tip of the tip up to the rear end of the thick taper part to complete the connection,
A tube connecting method, wherein the packing is brought into close contact with the outer peripheral surface of the insertion portion by taper fitting. One tube A Is the drainage pipe part that protrudes integrally from the drain pan of the air conditioner, and the other pipe body B The tube connecting method according to claim 1, wherein is a flexible drain hose.

Images