JP2000039088A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint capable of reliably sealing joining surfaces of a metallic joint member in the pipe joint for connecting a synthetic resin pipe and the metallic pipe to each other and synthetic resin. SOLUTION: An external thread part 16 is provided on the outer periphery of a metallic pipe connecting part 13 of a joint body 12, an opening 21 through which a metallic pipe 20 is to be inserted is provided on the inner periphery of a top plate 19, and a cap 15 having a seal material 22 to be brought into contact with the metallic pipe connecting part 13 and the end surface of a metallic joint member (a metallic internal thread member 14) is screwed to the inner surface of the outer periphery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe joint, and more particularly, to a pipe joint for connecting a synthetic resin pipe and a metal pipe.

[0002]

2. Description of the Related Art As a pipe joint for connecting a synthetic resin pipe and a metal pipe used for a water pipe or a gas pipe, one having a structure shown in a sectional view in FIG. 4 is used. This pipe joint 1
Is composed of a joint body 2 made of synthetic resin and a metal female screw member 4 which is a metal joint member insert-molded on the inner periphery of one of the metal tube connecting portions 3. The metal tube 5 is made of metal. The connection with the synthetic resin pipe (not shown) to the other resin pipe connection part 6 is usually made by an electric fusion method.

Further, in the pipe joint 1 in which the metal female screw member 4 is insert-molded, water or gas leaks to the outside through the joint surface 7 of the outer periphery of the metal female screw member 4 with the synthetic resin. In order to prevent this, as shown in the cross-sectional view of FIG. 5, a ring-shaped concave groove 8 is provided on the end face of the pipe connection portion, and a sealing material 9 is attached. Further, as shown in the cross-sectional view of FIG. Further, a ring-shaped holding plate 10 is provided on the outer surface of the sealing material 9 mounted on the concave groove portion 8.

[0004]

However, in the above-described mounting structure of the sealing material 9, the mounting of the sealing material 9 is troublesome, or a sufficient sealing property cannot be obtained depending on the internal pressure.

Accordingly, an object of the present invention is to provide a pipe joint in which a joint surface between a metal female screw member and a synthetic resin can be reliably sealed in a pipe joint in which a metal female screw member is insert-molded. I have.

[0006]

In order to achieve the above object, a pipe joint according to the present invention is a pipe joint in which a metal joint member is insert-molded on the inner periphery of a metal pipe connecting portion of a synthetic resin joint body. A male screw portion is provided on the outer periphery of the metal tube connection portion, and the male screw portion has an opening on the inner periphery of the top plate. The inner surface of the outer periphery of the top plate has an end surface of the metal tube connection portion and the metal joint member. And a cap provided with a sealing material that comes into contact with the outer peripheral surface of the flange portion.

[0007]

1 and 2 show an embodiment of a pipe joint according to the present invention. FIG. 1 is a sectional view and FIG. 2 is an exploded perspective view. The pipe joint 11 is a joint body 1 made of synthetic resin.
2, a female female screw member 14 insert-molded on the inner periphery of the metal tube connection portion 13 of the joint body 12, and a cap 15 screwed onto the outer periphery of the metal tube connection portion 13. The main body 12 is formed of a thermoplastic resin that can be joined by an electric fusion method, for example, polyethylene or the like, and the metal female screw member 14 is formed of the same steel for mechanical structure as in the related art. The cap 15 can be formed of metal, but can be formed of a synthetic resin such as polyethylene.

A male screw portion 16 for screwing the cap 15 is provided on the outer periphery of the metal tube connecting portion 13, and an octagonal shape for engaging a wrench or the like is provided on the outer periphery of the joint body at the base thereof. Are provided.

The cap 15 comprises a female screw portion 18 screwed to the male screw portion 16 and a top plate 19 provided at one end of the female screw portion 18. Are formed in the shape of an octagonal square axis for engaging with the boss. The top plate 19 has a metal tube 20 connected to its inner periphery.
Is formed in a ring shape having an opening 21 through which a sealing material (O-ring) 22 is mounted.

The sealing material 22 is in contact with the end face of the metal pipe connecting portion 13 and the outer peripheral surface of the flange portion 14a of the metal female screw member 14, and a joining surface 24 between the metal female screw member 14 and the resin layer. By screwing the cap 15 on which the sealing material 22 is attached to the male screw portion 16, liquid leakage and gas leakage from the joint surface 24 can be reliably prevented. . Moreover, the cap 15
Is fixed in a state of being screwed to the male screw portion 16,
The sealing material 22 can be reliably held at the sealing position, and a reliable sealing performance can be obtained even when the internal pressure is high.

Further, the outer peripheral surface of the cap 15 is formed in the shape of a square shaft, and the outer peripheral surface of the joint body 12 is formed with
Is provided, the screwing of the cap 15 to the joint body 12 can be easily and reliably performed, and the screw connection of the metal tube 20 to the metal tube connecting portion 13 can also be reliably performed. The other connecting portion of the joint body 12 may be connected to the synthetic resin tube 26 via the electro-fusion joint 25 as shown by the imaginary line in FIG. .

FIG. 3 is a sectional view showing another embodiment of the pipe joint of the present invention. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

This embodiment shows an example in which a metal male screw member 31 from which a male screw portion projects is used instead of the metal female screw member 14 as a metal joint member. Also in this case, by attaching the cap 15 having the sealing material 22 in contact with the outer peripheral surface of the flange portion 31a of the metal male screw member 31 and the end surface of the metal pipe connection portion 13, the joining surface 24 is formed.
The same operational effects as those described above, such as reliably preventing liquid leakage and gas leakage from the device, can be obtained.

[0014]

As described above, according to the pipe joint of the present invention, the joining surface between the insert-molded female female screw member and the synthetic resin of the joint body can be reliably sealed. Liquid and gas leaks from the air can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a pipe joint of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a sectional view showing another embodiment of the pipe joint of the present invention.

FIG. 4 is a sectional view showing an example of a conventional pipe joint.

FIG. 5 is a sectional view of a main part showing a conventional example of mounting a sealing material.

FIG. 6 is a cross-sectional view of a main part showing another conventional example of mounting a sealing material.

[Explanation of symbols]

11: pipe joint, 12: joint body, 13: metal pipe connection part,
14 ... metal female screw member, 14a ... flange part, 15 ...
Cap, 16: male screw part, 17: square shaft part, 18: female screw part, 19: top plate, 20: metal tube, 21: opening, 22:
Sealing material, 23 groove, 24 joining surface, 25 electric fusion joint, 26 synthetic resin tube, 31 male external thread member, 3
1a ... Flange part

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Kayanuma 60-81-1 Funatsu, Kawaguchiko-machi, Minamitsuru-gun, Yamanashi F-term in Asama Gosei Co., Ltd. 3H016 EA04 3H019 FA02 FA10

Claims (1)

[Claims] 1. A pipe joint in which a metal joint member is insert-molded on an inner periphery of a metal pipe connection portion of a synthetic resin joint body, wherein a male screw portion is provided on an outer periphery of the metal tube connection portion of the joint body, and the male screw portion is provided. A cap having an opening at the inner periphery of the top plate and screwing a cap provided on the inner surface of the outer periphery of the top plate with a seal material that comes into contact with the end surface of the metal pipe connection portion and the outer peripheral surface of the flange portion of the metal joint member. A pipe joint characterized by the following.