JPH08312856A - Pipe joint - Google Patents

Abstract

PURPOSE: To provide a pipe joint which can absorb deformation caused by occurrence of an earthquake or the like in a pipe line and is simple in structure. CONSTITUTION: A barrel 1 has a socket joining part 2 on one side and a piping connecting part 3 on the other side. A union socket 4 is fitted in the socket joining part 2. A stop ring 5 is fitted in annular grooves 6, 7 formed on the above fitted joining face. The union socket 4 has a connecting part 10 at its end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for use in pipelines for waterworks and the like, mainly for pipelines using polyethylene pipes.

[0002]

2. Description of the Related Art Regarding the joints used for polyethylene water supply, there is a standard by the Japan Water Works Association, and this standard joint is generally used. This standard joint is a type in which the joint and the polyethylene pipe are completely tightened and fixed by a cap nut. On the other hand, a joint in which the joint portion is rotatable so as to absorb the twist after the pipe is installed has already been proposed by the present inventor (Japanese Utility Model Publication No. 64-32991).

[0003]

However, in the standard joint described above, since the joint portion is of a fixed type, if the pipe line is twisted when an earthquake occurs, the joint is damaged or the cap nut is loosened. There is a problem that causes a water leak accident.
In Japanese Utility Model Application Laid-Open No. 64-32991 proposed by the present inventor, this problem is solved for the time being, but since the mechanism is made rotatable by using bearing balls, the cost is increased in terms of materials and assembly. In addition to this, there is a drawback that the shape of the connecting portion cannot be easily changed.

In view of such a point, the present invention can absorb the twist of the pipe line, the manufacturing cost is low, the connecting shape can be easily changed, and the connecting portion is suitable for the connected body. The purpose of the present invention is to provide a pipe joint that can be easily manufactured.

Further, the present invention is to provide a pipe joint capable of absorbing bending and expansion / contraction deformation in addition to twisting of the pipe line.

[0006]

The technical means of the pipe joint of the present invention is a cylinder having a socket connecting portion on one side and a pipe connecting portion on the other side, and one side fitted into a socket connecting portion of the cylinder. ,
It consists of a union socket having a connecting portion on the other side, and an annular groove is formed in the joint surface of the barrel and the union socket, and a retaining ring is fitted and joined in this groove.

Further, the pipe connecting portion of the body may be bent to form a bent shape.

Further, the body, the ball spherically contacted with the inner surface of the body to be rotatably fitted and held, and the sliding pipe fitted to the inner surface of the ball and having a pipe connecting portion at an end thereof. Becomes
It is also possible to interpose a stop coil spring in an annular shape on the joint surface between the ball and the sliding tube so that the sliding tube is coupled and held so as to be rotatable and axially movable with respect to the ball. .

[0009]

In the pipe joint of the present invention, since the body and the union socket are connected by the retaining ring fitted in the annular groove, the union socket is prevented from coming out of the body, but can be freely rotated. . Therefore, when twist occurs in the conduit, this twist absorbs the twist,
Water leakage can be prevented without damage or loosening of nuts. Also, the structure of the union socket connection is free, so by selecting the shape of the union socket,
It is possible to easily make a pipe joint having various shapes of connecting portions.

In the case of using a ball, the body and the ball are in spherical contact with each other, and the ball is rotatable within the body, so that it is possible to perform so-called swinging rotation. Further, since the ball and the slide tube are only connected by the stop coil spring, the slide tube is rotatable and movable in the axial direction. Therefore, by these movable functions, it is possible to absorb bending and expansion and contraction as well as twisting of the pipeline, and protect the pipeline and the pipe joint against any force generated after installation of the pipeline. Further, since the coil spring is used, the sliding tube can be connected and held with an extremely simple structure.

[0011]

Embodiments of the pipe joint of the present invention will be described with reference to the drawings. In the first embodiment of FIG. 1, the body 1 of the joint has a socket connecting portion 2 on one side and a pipe connecting portion 3 such as a polyethylene pipe on the other side. Reference numeral 4 is a union socket, which is fitted into the socket coupling portion 2, and a retaining ring 5 is fitted between the two. The retaining ring 5 is made of a tough and moderately elastic synthetic resin such as acetal resin, and its shape is annular as shown in FIGS. Has a notch.

The stopper ring 5 is composed of an annular groove 6 formed on the inner surface of the socket coupling portion 2 and an annular groove 7 formed on the outer surface of the union socket 4, which are opposed to each other 2
It is fitted so as to straddle two grooves. In this fitted state, the union socket 4 can freely rotate, but is prevented from coming out. In the figure, 8 is a dust ring and 9 is a seal ring.

The structure of the connecting portion 10 provided at the end of the union socket 4 is free, and in the first embodiment of FIG. 1, it has an external thread structure. The second embodiment shown in FIG. 4 has a structure in which a cap nut 11 is attached. By selecting various types of union sockets 4 in this way, it is possible to easily make a pipe joint having any connecting structure.

On the other hand, the pipe nut 3 is attached to the pipe connecting portion 3 of the body 1.
2 is attached, and the polyethylene pipe A is fitted and connected therein. 13 is a wedge ring and 14 is an incore. The shape of the pipe connecting portion 3 can be freely determined, and the third embodiment of FIG. 5 is an example in which the bent portion 15 is provided and extended to form a bent shape. The bent angle of the vent in this embodiment is 90 °, but the angle can be freely designed.

The fourth embodiment shown in FIG. 6 is a universal joint which allows bending and expansion / contraction in addition to rotation. In this pipe joint, a ball 20 is fitted and held inside the body 1. 21 is a ball retainer, which is screwed and fixed to the body 1. The ball 20 is in spherical contact with the body 1 and can freely swing and rotate. A sliding tube 22 is fitted inside the ball 20, and a stop coil spring 2 is provided between the sliding tube 22 and the sliding tube 22.
3 is interposed. That is, the stop coil spring 23 is fitted in a ring shape in the annular groove of the inner surface of the ball 20,
The inner surface of the coil spring 23 is in contact with the outer surface of the sliding tube 22. Therefore, the sliding tube 22 can freely move in the axial direction within the range allowed by the space in the body, and can also rotate in the circumferential direction.

A stopper 24 is formed at the end of the sliding tube 22 to prevent it from coming off. Therefore, when the sliding tube 22 moves in the direction of removal (to the right in the figure), the stopper 24 and the stop coil spring 23 come into contact with each other, and further movement is blocked. However, this contact prevents movement until normal load, and if an abnormal load is applied,
The stopper 24 can move further in the direction of withdrawal against the elastic force of the coil spring 23, so that the conduit can be protected in the event of an abnormality. Then, the stopper 24 and the stepped portion on the inner surface of the ball 20 collide with each other to completely prevent the ball from coming out. Further, when a load is applied from the opposite direction, the sliding tube 22 automatically returns to the original illustrated state again.

Reference numeral 25 in the drawing denotes a cover made of an elastic material. An inner screw 26 for connection is formed at the end of the body 1. However, the shape of this connecting portion is arbitrary, and it is also possible to adopt an outer screw type or a cap nut type. A cylinder 27 is fixed to the end of the sliding tube 22, and a polyethylene tube A is connected to the cylinder 27 in the form of a cap nut.

The present invention is not limited to the above-mentioned embodiments, but can be freely modified within the scope of the claims.

[0019]

Since the pipe joint of the present invention can freely rotate at the joint portion, the twist of the pipe can be absorbed by this rotation, and the pipe can be damaged by an earthquake or the water can be loosened due to the loosening of the nut. Leakage can be prevented. In addition, since the shape of the connecting portion of the union socket is free, it is possible to easily make a pipe joint having a shape suitable for the type of the connected body by selecting the union socket.

According to the second aspect of the present invention, since it has a vent shape, it is convenient to use in the bent portion of the pipeline.

According to the third aspect of the present invention, since the bending and the expansion and contraction can be absorbed in addition to the twisting of the pipeline, the pipeline can be protected from any force acting on the pipeline. Besides, the structure is relatively simple and the manufacturing cost can be suppressed.
It can be provided at a low price.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment.

FIG. 2 is a front view of a retaining ring.

FIG. 3 is a sectional view of a retaining ring.

FIG. 4 is a sectional view of the second embodiment.

FIG. 5 is a sectional view of the third embodiment.

FIG. 6 is a sectional view of a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Socket connection part 3 Pipe connection part 4 Union socket 5 Stop ring 6, 7 Annular groove 10 Connection part 12 Cap nut 13 Wedge ring 14 In-core 15 Bent part 20 Ball 21 Ball retainer 22 Sliding pipe 23 Stop coil spring

Claims (3)

[Claims] 1. A barrel comprising a socket coupling portion on one side and a pipe coupling portion on the other side, and a union socket having a socket coupling portion on the other side and a coupling portion on the other side. A pipe joint in which an annular groove is formed in the joint surface of the union socket and the union socket, and a retaining ring is fitted in the groove to be joined. 2. The pipe joint according to claim 1, wherein the pipe connecting portion of the body is bent and has a bent shape. 3. A body, a ball rotatably fitted and held in spherical contact with an inner surface of the body, and a sliding pipe fitted to the inner surface of the ball and having a pipe connecting portion at an end thereof. A pipe joint in which a stop coil spring is annularly mounted on the joint surface between the ball and the sliding pipe, and the sliding pipe is coupled and held so as to be rotatable and axially movable with respect to the ball.