JPH09296885A - Pipe fittings - Google Patents

Abstract

(57) [Summary] [Structure] The pipe joint body 16 made of a synthetic resin is connected to the connecting portion 24 that covers the surface of the male screw 18a by folding back the opening end on the male screw 18a side from the inner circumference of the metal insert 18. The connecting portion 24 side of the pipe joint 10 is connected to the valve 12
Of the pipe receiving portion 22 of the pipe joint 10
The PVC pipe 14 is inserted into the pipe, and the valve 12 is connected to the PVC pipe 14 using the pipe joint 10. After the connection, when water is flowed into the pipe line, the periphery of the male screw 18a of the metal insert 18 is covered with the connecting portion 24 made of synthetic resin, so that water enters between the metal insert 18 and the pipe joint body 16. There is no such thing. [Effect] Water leakage does not occur.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint, and more particularly to a pipe joint used for connecting a water pipe made of a synthetic resin such as vinyl chloride to a valve provided in the middle of a water distribution pipe.

[0002]

2. Description of the Related Art A conventional pipe joint 1 of this type shown in FIG.
It is for connecting the vinyl chloride pipe 3 to the valve 2 made of metal, and includes a cylindrical metal insert 4 having a tapered male screw 4a at one end of the outer periphery thereof. Valve 2 has
A female screw hole 2a for screwing with the male screw 4a of the metal insert 4 is provided. A main body 5 made of synthetic resin is molded by injection or the like on the entire inner circumference of the metal insert 4 and the end portion on the side opposite to the male screw 4a, and the metal insert 4 is embedded in the main body 5. A hole 5a for receiving the pipe end of the PVC pipe 3 is formed at the end of the main body 5 opposite to the metal insert 4.

Then, the male screw 4a of the metal insert 4 which is one end of the pipe joint 1 is screwed into the female screw hole 2a of the valve 2, and the pipe end of the PVC pipe 3 is fitted into the hole 5a of the main body 5 which is the other end of the pipe joint 1. And the PVC pipe 3 is connected to the valve 2.

[0004]

When tap water is supplied into the water distribution pipe in which the PVC pipe 3 is connected to the valve 2 by using the pipe joint 1, the outer periphery of the open end of the metal insert 4 on the male screw 4a side is It is metal and the inner circumference is synthetic resin, that is, the two layers come into contact with water. Therefore, there is a problem that the water supply infiltrates between these two layers, and if the water infiltration progresses, water will leak from the portion indicated by the arrow in FIG. 8 to the surface of the pipe joint 1.
In particular, when hot water is supplied, the main body 5 made of synthetic resin is thermally deformed, and a gap is likely to be formed between the metal insert 4 and the main body 5, so that water leakage is likely to occur on the surface of the pipe joint 1. Further, there is a problem that the water is contacted with the metal insert 4 which is a metal, and rust is generated from this portion.

Therefore, a main object of the present invention is to provide a pipe joint which does not cause water leakage.

[0006]

According to the present invention, in a pipe joint in which a metal insert having a screw is embedded in a pipe joint body made of synthetic resin, the surface of the screw of the metal insert is covered with a synthetic resin continuous from the pipe joint body. This is the pipe joint.

[0007]

When the surface of the screw of the metal insert is covered with the synthetic resin continuous from the pipe joint body, the water flowing in the pipe joint contacts only the synthetic resin and does not contact the metal insert. That is, unlike the conventional case, water does not come into contact with the two layers of the metal insert and the pipe joint body, so that water does not enter through the gap between them.

[0008]

According to the present invention, since water does not enter between the pipe joint body and the metal insert, water does not leak on the surface of the pipe joint. The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The pipe joint 10 of this embodiment shown in FIG.
Is for connecting the PVC pipe 14 to the valve 12 made of metal and provided in the middle of the water distribution pipe line laid in the ground as shown in FIG. It includes an embedded metal insert 18.

The metal insert 18 is made of metal such as casting and is formed in a cylindrical shape, and a tapered male screw 18a is formed at one end of the outer periphery thereof. The male screw 18a has a plurality of slits 18 (four in this embodiment) extending in the axial direction.
b is formed, and the threads of the male screw 18a are formed intermittently at a predetermined angle (90 ° in this embodiment). At a predetermined position on the outer periphery of the metal insert 18 on the side opposite to the male screw 18a, a hexagonal tightening portion 20a extending outward with a predetermined width and seen from the axial direction is formed. Then, the tightening portion 20a
On the side opposite to the male screw 18a of the
b is connected.

The pipe joint body 16 is formed by injection molding a synthetic resin such as vinyl chloride, and includes a pipe receiving portion 22 extending from the tightening portion 20a of the metal insert 18 toward the end portion 20b in a cylindrical shape. The pipe receiving portion 22 is for receiving the pipe end of the PVC pipe 14 from the outer periphery and connecting the pipe joint 10 to the PVC pipe 14. The pipe receiving portion 22 has an inner diameter substantially equal to the outer diameter of the PVC pipe 14 and has a predetermined depth. 22a.

On the side opposite to the open end of the pipe receiving portion 22 of the pipe joint body 16, the hole 2 of the pipe receiving portion 22 is formed so as to cover the entire end 20b of the metal insert 18 and further cover the entire inner circumference.
A connecting portion 24 that is continuous from the portion 2a is provided. The connecting portion 24 is formed so as to extend and cover the opening end of the metal insert 18 on the male screw 18a side so as to expand its diameter, and further cover the surface of the male screw 18a so as to be folded back to extend to the tightening portion 20a of the metal insert 18. It Connection part 24
The portion of the male screw 18a that covers the surface of the male screw 18a is formed to have substantially the same shape as that of the male screw 18a. . At this time, the slit 18b formed in the male screw 18a of the metal insert 18 is filled with the synthetic resin at the time of injection of the pipe joint body 16 to prevent the screw portion 24a from rotating.

Referring to FIG. 4, when connecting the PVC pipe 14 to the valve 12 using the pipe joint 10, first, the threaded portion 24a of the connecting portion 24 of the pipe joint 10 is provided in the valve 12 in a tapered shape. Metal insert 18 in female screw hole 12a
The tightening portion 20a of the pipe is screwed by tightening with a tool such as a wrench to connect the valve 12 to the connecting portion 2 of the pipe joint 10.
Connect 4 sides. Next, the PVC pipe 14 is connected to the pipe joint 10 by inserting the pipe end of the PVC pipe 14 into the hole 22a of the pipe receiving portion 22 on the other end side of the pipe joint 10 so as to receive it from the outer periphery.

The valve 12 is connected to the PVC pipe 1 by using the pipe joint 10.
When tap water flows from the valve 12 side toward the PVC pipe 14 side in the water distribution pipe connected to 4, the water from the valve 12 passes through the inside of the connection end 24 of the main body 16 of the pipe joint 10 from the inside thereof. It is guided to the inside of the PVC pipe 14. At this time, in the portion of the connecting portion 24 that contacts the water at the opening end, the entire inner circumference of the metal insert 18 made of metal is covered with synthetic resin, and further folded back at the opening end to cover the surface of the male screw 18a of the metal insert 18. , Metal insert 18
Does not come into contact with the water flowing in the pipe end.

According to this embodiment, since the metal insert 18 of the pipe joint 10 does not come into contact with the water flowing in the water distribution pipe, the water between the metal insert 18 and the pipe joint main body 16 is different from the prior art. Water can be prevented from leaking from the surface of the pipe joint 10 after that. Further, when hot water is flown into the pipe joint 10, even if the pipe joint body 16 is thermally deformed and a gap is created between the metal insert 18 and the pipe joint body 16, it is possible to prevent water from entering the gap. It can be prevented. Furthermore, since the metal insert 18 does not come into contact with water,
It is possible to prevent rust from being generated in the water distribution pipe from this portion.

A pipe joint 30 of another embodiment shown in FIG. 5 uses a metal insert 32 shown in FIG. 6 instead of the metal insert 18 shown in FIG. The metal insert 32 removes the thread of the male screw 18a of the metal insert 18 shown in FIG. 3 for each lead,
The male screw 34 is intermittent. In addition, male screw 3
Also, a plurality of slits 34a extending in the axial direction (four in this embodiment) are formed in No. 4. Then, when the pipe joint main body 36 is molded by injection or the like, a tapered threaded portion 38 formed of synthetic resin such as vinyl chloride and continuous in a spiral shape is formed on the surface of the male screw 34.

Also in this embodiment, the opening end of the pipe joint 30 on the side of the threaded portion 38 is continuous from the inner periphery of the metal insert 32 to the surface of the male screw 34 by the pipe joint body 36 made of synthetic resin. Covered. Therefore,
The metal insert 32 does not come into contact with water in the water distribution line. Therefore, the metal insert 32 and the pipe joint body 3
It is possible to prevent water from leaking to the surface of the pipe joint 30 due to the intrusion of water between the pipe 6 and the pipe 6.

As another embodiment, a pipe joint 40 using a metal insert 40a in which the slit 18b is not provided in the male screw 18a of the metal insert 18 shown in FIG. 3 as in the other embodiment shown in FIG. It is also possible to connect the valve 12 to the PVC pipe 14 using. In the above-described embodiment, the case where the surfaces of the male screws 18a and 34 are covered with the synthetic resin continuous from the pipe joint bodies 16 and 36 has been described, but the surface of the female screw may be covered with the synthetic resin continuous from the body. Good. For example, it is possible to cover the water from the female part of the water tap socket, elbow, cheese and the like with the synthetic resin so that the metal part does not come into contact with water.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an illustrative view showing a state in which a valve and a PVC pipe are connected using the pipe joint in the embodiment of FIG.

FIG. 3 is a perspective view showing a metal insert.

FIG. 4 is an illustrative view showing a method of connecting the valve and the PVC pipe in FIG.

FIG. 5 is a perspective view showing another embodiment of the present invention.

FIG. 6 is a perspective view showing a metal insert in FIG. 5 embodiment.

FIG. 7 is a perspective view showing another embodiment of the present invention.

FIG. 8 is an illustrative view showing a conventional technique.

[Explanation of symbols]

 10, 30, 40 ... Pipe joint 12 ... Valve 14 ... PVC pipe 16, 36 ... Pipe joint body 18, 32, 40a ... Metal insert 18a, 34 ... Male screw 18b ... Slit 20a ... Tightening portion 22 ... Pipe receiving portion 22a ... Hole 24 ... Connection part 24a, 38 ... Screw part

Claims (1)

[Claims] 1. A pipe joint in which a metal insert having a screw is embedded in a pipe joint body made of synthetic resin, wherein the surface of the screw of the metal insert is covered with the synthetic resin continuous from the pipe joint body. Pipe fittings.