JPS6392894A - Connector for pipe made of resin - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a resin pipe connecting device for connecting resin pipes or a resin pipe and a metal pipe.

[Technical background of the invention and its problems] A conventional resin pipe connecting device is constructed as shown in FIG. That is, the connecting device 1 is made of polyethylene (
EP) A joint body comprising a reinforcing pipe 3 inserted into the end of the pipe 2, an outer cylindrical part 4a engaged with the outer periphery of the end of the PE pipe 2 and facing the reinforcing pipe 3, and a flange 4b located at the end thereof. 4, a coupling 7 that is screwed onto the end of the outer cylinder part 4a and compresses the rubber backing 5 inserted into the end of the outer cylinder part 4a through a washer 6; A band 8 is used for tightening, which is connected to the coupling 7 by engaging a protrusion on the inner periphery of the end with a concave groove in the circumferential direction of the end. The two-part fastener has a claw ring having a plurality of circumferential protrusions on its surface, and a bolt 10 that fastens between the rings 8.

The rubber backing 5 is compressed by the 9 m of the coupling 7, forming a seal between the outer cylindrical portion 4a and the PE pipe 2, and by tightening the bolt 10, the protrusion on the inner peripheral surface of the claw ring 9 is made of PE. It bites into the outer peripheral surface of the pipe end, and the fitting body 4
is fixed to the end of the PE pipe 2.

To connect the pipe to be connected 11 to the PE pipe 2, the flange portion 4b of the joint body 4 is brought into contact with the flange portion 11a of the pipe to be connected 11 via the backing 12, and the bolt 13 is
All you have to do is tighten it up.

The conventional connection device having the above configuration has the following problems.

First, the structure is complex and tends to be expensive.

Second, when connecting, use coupling 7 and tighten band 8.
etc., and it takes a long time to connect.

Thirdly, since the rubber backing 5 deteriorates over time, the backing must be replaced at regular intervals or the coupling 7
Requires additional tightening.

Fourth, the outer diameter becomes larger due to the structure.

Fifth, the gripping force on the PE pipe is
It is difficult to obtain a large gripping force because the gripping force is only given by compression of
It is necessary to prepare several types of reinforcing pipes depending on the inner diameter of the PE pipe.

etc.

[Objective of the Invention] The present invention has been made based on the above circumstances, and has a simple structure and can be provided at low cost, can be connected in a short time, and can apply a large gripping force to a PE pipe. The purpose is to obtain a connecting device for resin pipes that can be used.

[Summary of the Invention] The resin pipe connecting device of the present invention includes a reinforcing pipe inserted into the end of the resin pipe, and a plurality of protrusions on the inner circumferential surface facing the reinforcing pipe, which is made of a plastically deformable metal. An outer cylinder part with stripes, a flange part provided at the end of the outer cylinder part,
The joint body is characterized by having a joint body which is fixed to the resin pipe by causing the protrusions to bite into the outer circumferential surface of the end of the resin pipe by compression of the outer cylindrical portion.

[Embodiment of the Invention] FIG. 2 shows an embodiment of the present invention. In this figure, a joint body 20 includes an outer cylinder part 21, a flange part 23 formed at one end thereof, and a flange part 23 formed at one end of the outer cylinder part 21. The hand main body 20, which is provided on the inner circumferential surface of the small diameter portion 21a formed on the side opposite to the flange, and has an uneven portion 22 with a sawtooth cross section and a plurality of protrusions, is made of plastically deformable material such as aluminum or iron. It is made up of materials.

The connecting device of the present invention having the above configuration is attached to the connected pipe 24 by bringing the flange portion 23 of the joint body 20 into opposing contact with the flange portion 24a of the connected pipe 24 via the backing 25, and tightening the bolt 26. . Connected pipe 24 and P
To connect the E pipe 27, first insert the reinforcing pipe 28 into the end of the PE pipe 27, and then insert the outer cylindrical part 2 of the joint body 20 attached to the pipe 24 to be connected as described above.
The end of the PE pipe 27 is inserted into the PE pipe 27, and compression is applied in the radial direction from the outer periphery of the small diameter portion 21a of the outer cylinder portion 21 using an appropriate device (not shown) such as a compression die.

Due to this compression, the small diameter portion 21a of the outer cylindrical portion 21 undergoes plastic deformation, and the protrusion of the uneven portion 22 bites into the outer periphery of the end of the PE pipe 27. will be connected. In the connecting device of the present invention having the above configuration, the airtightness of the connecting portion is ensured by the biting of the protrusions and the compression of the backing 25 interposed between the flange portions 23, 24a;
If even higher airtightness is required, as shown in FIG.
A circumferential groove 29 may be provided at the end, and the seal member 30 may be placed within this groove.

Note that when compressing the small diameter portion 21a, the plastic deformation is limited to the small diameter portion 21a and does not extend to other parts of the outer cylinder portion 21, but as described above, the plastic deformation is If the flange portion 24a of the pipe 24 is connected, even if a slight deformation occurs, the flanges will not be unable to connect.

Further, the uneven portion 22 formed in the small diameter portion 21a is not limited to the illustrated sawtooth shape. For example, the uneven portion 22 is spiral shaped.
Any cross-sectional shape can be used as long as it easily bites into the outer peripheral surface of the pipe.

[Effects of the Invention] The connecting device of the present invention having the above configuration has an extremely simple structure and can be provided at low cost. Further, since the joint main body outer cylindrical portion 21 and the PE pipe 27 can be connected by just one compression, the connection work can be completed in a short time. Note that since there is no backing interposed between the PE pipe 27 and the outer cylindrical portion 21, it is naturally unnecessary to take measures to deal with changes in the backing over time. Since the gripping force is directly applied by compression of the outer cylinder, this gripping force is used to compensate for variations in the dimensional intersection of the PE pipe inner diameter,
The PE pipe can be brought into close contact with the reinforcing pipe, and there is no need to prepare multiple types of reinforcing pipes 1.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway cross-sectional view of a conventional resin pipe connecting device, Fig. 2 is a cross-sectional view of an embodiment of the present invention, and Fig. 3 is a cross-sectional view showing an enlarged main part of a modification thereof. It is. 20......Coupling body 21......Outer cylindrical portion 21a...Small diameter portion 22......Irregular portion 23.24a. ...Flange portion 24...Connected pipe 25...Backing 26...Bolt 27... ...PE pipe 28...Reinforcement pipe 29...Groove

Claims (1)

[Claims] a reinforcing pipe inserted into the end of the resin pipe; an outer cylinder part made of a plastically deformable metal, engaged with the resin end, facing the reinforcing pipe, and having a plurality of protrusions on its inner peripheral surface; The joint body is characterized by having a flange portion provided at the end thereof, and a joint body fixed to the resin pipe by causing the protrusion to bite into the outer circumferential surface of the end of the resin pipe by compression of the outer cylindrical portion. Connection device for resin pipes.