JPH07139667A - Removal-protective corrosion-proof pipe fitting - Google Patents

Abstract

PURPOSE:To prevent a lining metal pipe from being pulled out and prevent generation of red water securely. CONSTITUTION:A circular groove 31 is provided in an inner circumferential surface of a metal fitting 3 in which a lining metal pipe 7 is inserted, a rubber ring 5 is installed on the circular groove 31, a ring groove 32 is provided on the aperture side of the circular groove 31, and a lock ring 6 is installed on the ring groove 32. The inner circumferential surface of the metal fitting 3 is coated with a layer of a synthetic resin 4, and the synthetic resin layer 4 is extended on the aperture side to provide a cylindrical body 41. Palling out of the lining metal pipe 7, and generation of red water can thus be prevented securely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separation preventing and corrosion preventing pipe joint capable of reliably preventing extraction of a lining metal pipe and generation of red water.

[0002]

2. Description of the Related Art As a separation prevention pipe joint of this type, for example, an annular groove 31 is provided on the inner peripheral surface of a metal joint 3 into which a lining metal pipe 7 is inserted as shown in a partial sectional view of FIG. It has been proposed that the rubber ring 5 is attached to the annular groove 31, and the ring groove 32 is provided on the opening side of the annular groove 31 and the lock ring 6 for preventing the pipe from being pulled out is attached to the ring groove 32.

[0003]

However, in this conventional separation prevention pipe joint, when the metal joint 3 is connected to the lining metal pipe 7 whose inner peripheral surface is covered with the synthetic resin layer, the pipe tip is Between the inner part and the inner part of the metal joint 3
Therefore, the exposed metal member may be corroded by the fluid in the pipe that has entered the gap S, and red water may be generated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and provides a separation preventing and corrosion preventing pipe joint which can prevent the lining metal pipe from being pulled out and can surely prevent the generation of red water.

[0005]

The pipe joint of the present invention is provided with an annular groove on the inner peripheral surface of a metal joint into which an end of a lining metal pipe is inserted, and a rubber ring is attached to the annular groove.
A ring groove is provided on the opening side of the annular groove and a lock ring is attached to the ring groove, and the inner peripheral surface of the joint on the inner side of the annular groove is covered with a synthetic resin layer, and the synthetic resin A cylindrical body extending from the layer to the opening side is provided, and the inner peripheral surface of the end portion of the lining metal pipe is brought into contact with the outer peripheral surface of the cylindrical body for connection.

[0006]

When the lining metal pipe is fitted into the pipe joint, the rubber ring is pressed against the outer peripheral surface of the pipe to make a watertight connection, and the lock ring bites into the outer peripheral surface of the pipe to prevent the pipe from being pulled out. Further, since the inner peripheral surface of the end portion of the lining metal pipe abuts on the outer peripheral surface of the tubular body to make a watertight connection, generation of red water due to corrosion of the metal portion is prevented.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a detachment prevention anticorrosion pipe joint showing an embodiment of the present invention, in which a symbol a is a joint body, and b is a detachment prevention anticorrosion pipe joint.

The joint body a is formed by integrally coating the inner peripheral surface of the metal joint 1 excluding the female thread 11 with a synthetic resin layer 2 such as vinyl chloride resin. A cylindrical body 21 is provided on the inner peripheral side of the internal thread 11 and extends from the synthetic resin layer 2 toward the opening side and has a predetermined gap 12 between the internal thread 11 and the internal thread 11.
An end portion of a separation prevention anticorrosion pipe joint b described later can be fitted into the predetermined gap 12.

The detachment prevention anticorrosion pipe joint b has an annular groove 3 on the inner peripheral surface of one end of the metal joint 3 into which the lining metal pipe 7 is fitted.
1, a rubber ring 5 is attached to the annular groove 31, a ring groove 32 having an inclined surface is provided on the opening side of the annular groove 31, and the lock ring 6 is attached to the ring groove 32. , Bolt 6 screwed to the tip of the joint
The lock ring 6 can be contracted by screwing 1 in.

Further, a male screw 3 is provided on the other end of the metallic joint 3.
0 is provided, and the inner peripheral surface of the joint corresponding to the inner peripheral side of the male screw 30 is integrally covered with a synthetic resin layer 4 such as vinyl chloride resin. A cylindrical body 41 is provided so as to extend from the synthetic resin layer 4 to the opening side, and the metal joint 3
When the end of the lining metal pipe 7 is inserted into the cylindrical body 41
The inner peripheral surface of the end portion of the lining metal pipe 7 is brought into contact with the outer peripheral surface of to make a watertight connection.

When connecting the lining metal pipe 7 using the pipe joint of the present invention, first, the separation preventing and corrosion preventing pipe joint b is connected to both ends of the joint body a. At this time, the male thread 30 of the pipe joint b is screwed into the female thread 11 of the joint body a, and a sealing material such as silicone rubber is interposed between the outer peripheral surface of the tubular body 21 and the synthetic resin layer 4 to make it watertight. Connect to.

Next, the lining metal pipe 7 in which the inner peripheral surface of the metal pipe 71 is covered with a synthetic resin layer 72 such as vinyl chloride resin
Is inserted into the pipe joint b, the rubber ring 5 is pressed against and connected to the outer peripheral surface of the pipe end portion, and the synthetic resin layer 7 on the inner peripheral surface of the pipe end portion is connected.
A sealing material such as silicone rubber is interposed between 2 and the outer peripheral surface of the tubular body 41 to make a watertight connection. Therefore, when the lock ring 6 is reduced in diameter by the bolt 61 and cut into the outer peripheral surface of the end portion of the lining metal pipe 7, the connection work is completed.

[0013]

As described above in detail, in the pipe joint of the present invention, when the lining metal pipe is connected, the inner peripheral surface of the end portion of the lining metal pipe comes into contact with the outer peripheral surface of the tubular body to ensure watertightness. Therefore, it is possible to reliably prevent the generation of red water due to the corrosion of the metal member. Further, since the lock ring bites into the outer peripheral surface of the lining metal pipe to reliably prevent the pipe from being pulled out, a water leakage accident due to the pipe coming off after the pipe construction is not caused.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a separation preventing / corrosion preventing pipe joint showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a conventional separation prevention pipe joint.

[Explanation of symbols]

 a Joint body b Detachment prevention anticorrosion pipe joint 1,3 Metal joint 2,4 Synthetic resin layer 5 Rubber ring 6 Lock ring

Claims (1)

[Claims] 1. An annular groove (31) is provided on an inner peripheral surface of a metal joint (3) into which an end of a lining metal pipe (7) is inserted, and a rubber ring (5) is provided in the annular groove (31). The ring groove (3) on the opening side of the annular groove (31).
2) is provided and the lock ring (6) is provided in the ring groove (32).
A tubular joint in which the inner peripheral surface of the joint on the inner side of the annular groove (31) is covered with a synthetic resin layer (4) and extends from the synthetic resin layer (4) to the opening side. Body (41)
Is provided, and the inner peripheral surface of the end portion of the lining metal pipe (7) is brought into contact with the outer peripheral surface of the tubular body (41) to be connected thereto, and the anticorrosion pipe joint for preventing separation.