JP2002323180A - Airtight retainer of connection part for duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a complete airtightness by completely dispensing with windings of airtight tape, simply fitting ducts to each other, and fastening them with rivets. SOLUTION: Annular fallen and lying pieces 7 facing in the centrifugal direction are provided at appropriate positions of an annular tie 5 and the annular tie 5, having a receiving annulus 6 facing in the centripetal direction in the front end of the annular tie 5 in an elastic packing 4, is fitted to the tip part of an inner tube 1 and the receiving annulus 6 is made to abut on the tip surface of the inner tube. By fitting an outer tube 2 is from the front end of the elastic packing 4, the annular fallen piece 7 is made to fall and lie down by the tip of the outer tube 2, and the annular fallen and lying pieces 7 seal the clearance between the inner tube 1 and the outer tube 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for maintaining the airtightness of a connecting portion in a duct for supplying gas for air conditioning or ventilation.

[0002]

2. Description of the Related Art Conventionally, in a building or the like, in order to connect an inner pipe and an outer pipe of a duct as described above, the two pipes are fitted to each other with a gap as small as possible. Is generally fastened with a plurality of rivets, and an airtight tape is wound around the inner and outer pipes so as to cover the tip of the outer pipe and adhered.

[0003]

However, as described above, it is not easy to wind or replace the airtight tape around the connecting portion of the duct which is usually arranged at a high place, and it is troublesome. And, in some cases, also involve risks.

Further, it is needless to say that discarding or disposing of the airtight tape removed at the time of removing or replacing the duct is not preferable in terms of environmental conservation.

The present invention eliminates the necessity of winding the airtight tape as described above, and achieves complete airtightness simply by fitting the ducts together and riveting. The purpose of the present invention is to obtain a device for maintaining the airtightness of the connecting portion of the duct, and its specific configuration is as follows.

[0006]

[Means for solving the problems] (1) In the right place of the annular belt,
The annular band in the elastic packing provided with an annular falling piece oriented in the centrifugal direction and provided with a receiving ring oriented in the centripetal direction at the front end of the annular band is fitted to the distal end of the inner tube, and the receiving ring is Is brought into contact with the distal end surface of the inner tube, and the outer tube is fitted from the front end of the elastic packing. Seal the gap between them.

(2) In the above item (1), a pressing protruding ring is provided on the inner surface or the outer surface of the ring-shaped falling piece.

(3) In the above item (1) or (2), the support ring has a U-shaped cross section so that it can be fitted to the tip of the inner tube.

[0009]

1 to 4 show a first embodiment of the present invention. At the right end of the inner tube (1) where the outer tube (2) is to be inserted, an outward annular ridge (3) for receiving
Are formed.

The outer tube (2) is formed in a circular groove from the tip of the inner tube (1).
Prior to this insertion, as shown in FIG. 2, a slightly soft annular elastic packing (4) made of rubber or plastic is attached to the tip of the inner tube (1). Are fitted.

As shown in FIGS. 2 to 4, the elastic packing (4) can be fitted to the tip of the inner pipe (1), and the outer diameter of the elastic packing (4) is equal to that of the tip of the outer pipe (2). A thick support ring facing the centripetal direction at the front end of a thin annular band (5) slightly smaller in diameter than the inner diameter
(6) is integrally provided, and an annular downturning piece (7) projecting in the centrifugal direction is integrally provided at the rear end of the annular band (4).

The thickness of the annular band (5) is substantially equal to or slightly smaller than the difference between the outer diameter of the inner tube (1) and the inner diameter of the outer tube (2).

As shown in FIG. 2, when the outer pipe (2) is inserted from the tip of the inner pipe (1), the tip of the outer pipe (2) comes into contact with the receiving ring (6) of the elastic packing (4). ) And the outer circumferential surface of the annular band (5), and as shown in FIG. 3, the tip of the outer tube (2) comes into contact with the annular falling piece (7), which is turned down. As shown, the falling piece (7) is tilted so as to be substantially horizontal, and is pinched between the inner pipe (1) and the outer pipe (2).

At this time, the distal end of the outer circumferential surface of the ring-shaped falling piece (7) strongly pushes the inner surface of the outer tube (2). While strongly pressing the outer surface of (1), the tip of the receiving ring (6) bends or inclines in the centrifugal direction to strongly press the inner surface of the outer tube (2). Therefore, the airtightness between the inner pipe (1) and the outer pipe (2) is strongly maintained, and both are strongly prevented from coming off.

[0015] The inner tube (1) on the inner and outer surfaces of the annular falling piece (7).
And in order to increase the pressing force against the outer tube (2),
As shown in FIG. 5, a pressing protruding ring (8) may be provided on the outer side surface or the inner side surface of the annular falling piece (7).

The inner tube (1) and the outer tube fitted to each other
(2) is appropriately riveted.

Since the present invention is configured as described above, sufficient airtightness can be obtained without attaching an airtight tape over the distal end of the outer tube and the outer peripheral surface of the inner tube as in the prior art. This greatly saves labor for construction.

In the embodiment shown in FIGS. 1 to 5, the annular undulation piece (6) is in an upright state with respect to the annular band (5). It may be a piece.

The receiving ring (6) of the above-mentioned elastic packing (4)
As shown in FIG. 6, a support ring having a U-shaped cross section facing rearward
In the case of (9), by fitting this to the distal end of the inner tube (1), it can be easily attached to an appropriate position and will not come off unnecessarily.

FIG. 7 shows another embodiment, wherein
(7) is provided at the front end of the annular band (5), that is, immediately after the receiving ring (6). A pressing ring (8) is provided at an appropriate position of the annular band (5).

It is clear that the same operation as in the above-described embodiment can be obtained even in this case.

[0022]

According to the first aspect of the present invention, when the inner and outer pipes are fitted to each other, the annular falling piece of the elastic packing automatically presses the inner surface of the outer pipe to effectively maintain airtightness. , And are prevented from falling off.

Also, even if the distance between the inner and outer pipes is considerably large or small, the airtightness between them is maintained, and the axes of the inner and outer pipes are correctly aligned, the air flow is disturbed, and noise is generated. Or increase in resistance is prevented.

Furthermore, unlike the related art, there is no need to wind the airtight tape around the connecting portion of the duct, so that the environment is not adversely affected by the unnecessary airtight tape.

According to the second aspect of the present invention, the pressing force on the inner and outer tubes facing the inner and outer tubes by the annular undulating piece is increased, so that the airtightness is further improved.

According to the third aspect of the present invention, since the receiving ring is fitted and held at the tip of the inner tube, the operation of inserting the inner and outer tubes becomes easy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of an embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view of the apparatus shown in FIG. 1 immediately before fitting an outer tube to an inner tube.

FIG. 3 is an enlarged longitudinal sectional view showing a state in which the outer tube is slightly fitted into the inner tube, and the distal end of the outer tube has begun to press the annular falling piece of the elastic packing.

FIG. 4 is an enlarged longitudinal sectional view showing a state in which the outer tube is sufficiently fitted to the inner tube, and the annular undulating piece of the elastic packing is folded so as to be sandwiched between the inner and outer tubes.

FIG. 5 is a longitudinal sectional side view showing a different example of the elastic packing.

FIG. 6 is a vertical sectional side view showing still another example of the elastic packing.

FIG. 7 is a longitudinal sectional side view showing still another example of the elastic packing.

[Explanation of symbols]

 (1) Inner tube (2) Outer tube (3) Annular ridge (4) Elastic packing (5) Annular band (6) Bearing ring (7) Annular falling piece (8) Pressing lug

Claims (3)

[Claims] 1. An annular packing in an elastic packing provided with an annular falling piece oriented in a centrifugal direction at an appropriate position of an annular band and a receiving ring oriented in a centripetal direction at a front end of the annular band. The receiving ring is brought into contact with the distal end surface of the inner pipe, and the outer pipe is fitted from the front end of the elastic packing. An airtightness maintenance device for a connecting portion in a duct, wherein a gap between an inner tube and an outer tube is sealed with an annular lodging piece. 2. The airtightness maintaining device for a connecting portion in a duct according to claim 1, wherein a pressing protruding ring is provided on an inner surface or an outer surface of the annular falling piece. 3. A duct according to claim 1, wherein the receiving ring has a U-shaped cross section so that it can be fitted to the tip of the inner tube. apparatus.