JPH08135857A - Sealing core for pipe coupling - Google Patents

Abstract

PURPOSE: To obtain a sealing core for a pipe coupling which can seal the end part of a water supply pipe, in correspondence with the difference of the thickness of a dustproof covering formed on the inner peripheral surface of the connected water supply pipe. CONSTITUTION: A sealing core for a pipe coupling has a fitting pipe part 10 inserted into a connected pipe P and a flexible arnular close attachment pipe 11 which has a fiange part 12 which makes contact with the end surface P1 of the connected pipe and is formed integrally by a synthetic resin member and is continuous in the circumferential direction on the outer peripheral surface of a fitted pipe part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing core used in a water pipe joint.

[0002]

2. Description of the Related Art In FIG. 4, a is a joint body, b is a tightening nut, c is a tapered tightening ring, and d is a washer, each made of a metal material. Reference numeral e is a rubber ring, and f is a synthetic resin sealing core.

The sealing core f includes a fitting pipe portion f ₁ to be inserted into a connected water pipe g and a cut end face g ₁ of the connected water pipe g.
In a flange portion f ₂ abuts, O-ring h is supported in an annular groove f ₃ formed in the flange portion f _2. The sealing core f is a cut end surface g ₁ of the connected water pipe g.
Prevents the rust generated in the product from entering the drinking water.

By the way, on the inner peripheral surface of the water pipe g, an anticorrosion coating layer i made of vinyl chloride lining or poly powder coating is used.
However, since the thickness varies depending on the type of the coating layer i, the fitting pipe portion f ₁ may not come into close contact with the coating layer i on the inner peripheral surface of the water pipe g.

In addition, on the inner peripheral surface of the tapered tightening ring c that has been split, a biting protrusion c ₁ for strengthening the clamping force by biting into the outer peripheral surface g ₂ of the connected water pipe g. , But the connected water pipe g as shown in FIG.
Or, the sealing core f receives the step a ₁ of the joint body a.
When the tightening work is started by rotating the tightening nut b in the state of abutting against the water pipe, the water pipe g to be connected g
The ridge c ₁ biting into the outer peripheral surface g ₂ of the blade moves axially as the tightening work progresses, and the sharp edge is scraped off due to friction with the outer peripheral surface g ₂ and becomes round and blunt. And the connection strength decreases.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, absorbs a difference in inner wall size of a water pipe to be connected, and is a joint for a water pipe to be connected during tightening work. (EN) A core for sealing a pipe joint, which can absorb the advance margin in the main body.

[0007]

In order to achieve the above object, in the sealing core of the pipe joint according to the present invention,
It has a fitting pipe part to be inserted into the connected pipe and a flange part that comes into contact with the end face of the connected pipe, is integrally formed of a synthetic resin material, and is continuous in the circumferential direction on the outer peripheral surface of the fitting pipe part. A structure in which a flexible annular contact piece is provided and a structure in which a flexible abutment that abuts on the receiving step of the joint body is provided on the end surface of the flange portion are adopted.

[0008]

The flexible annular contact piece continuous in the circumferential direction comes into close contact with the inner peripheral surface of the pipe to be connected while being forcedly deformed.
Moreover, the flexible abutment absorbs the advance margin of the connected pipe with respect to the joint body.

[0009]

EXAMPLE In FIG. 1, A is a metal joint body, B is a metal tightening nut, C is a metal tapered tightening ring, and D is a metal tightening ring.
Is a metal washer, E is a rubber seal ring, and F is a sealing core made of synthetic resin such as polyene.

In the joint body A, as is well known, a small-diameter connecting portion 1 for one of the connected water pipes and a large-diameter receiving portion 2 for the other P (see FIG. 2) of the connected water pipes are provided with receiving step portions 3. A large-diameter male screw portion 5 is formed at the end of the large diameter receiving portion 2 via a tapered rubber ring receiver 4 on the inner peripheral surface. As is well known, the tightening nut B has a female screw portion 6 formed on the inner peripheral surface thereof, an inner collar portion 7 for tightening, and a tapered outer peripheral surface 8. The attachment ring C has a plurality of biting protrusions 9 formed on the inner peripheral surface thereof.

In the sealing core F, the connected water pipe P
On the outer peripheral surface of the fitting pipe portion 10 to be inserted therein, a plurality of flexible annular contact pieces 11 continuous in the circumferential direction are continuously provided in an outer brim shape, and are provided at the end of the fitting pipe portion 10 to be connected. In the outer peripheral portion of the flange portion 12 that abuts the cut end surface P ₁ of the water pipe P,
An annular support groove 14 for the O-ring 13 is formed, and an outer wall 15 that forms the annular support groove 14 projects in a tapered shape to form a flexible abutting body that abuts on the receiving step 3 of the joint body.

In the above structure, when connecting the water pipe,
Without connecting the fitting pipe portion 10 of the sealing core F into the connected water pipe P.
It is press-fitted, and at this time, the outer peripheral surface of the fitting pipe 10 is
The formed flexible annular contact piece 11 has an inner peripheral surface P of the water pipe P.₂
Inner peripheral surface P while being deformed by ₂To seal against the
Carry (see Figure 2).

Next, the tightening nut B, the tightening ring C, the washer D and the seal ring E are fitted to the water pipe P, and then the water pipe P is inserted into the large diameter receiving portion 2 of the joint body A. , A flexible abutting body composed of the protruding outer wall 15 of the sealing core F is brought into contact with the receiving step portion 3, and at this time, a water pipe P is provided between the sealing core F and the receiving step portion 3.
The leading margin absorption interval w is formed (see FIG. 2).

In this state, when the tightening nut B is rotated, the tightening nut B pressurizes the tightening ring C to advance the bite projection 9 while biting it into the outer peripheral surface of the water pipe P. At this time, since the water pipe P has the advancing margin absorption interval w, the tightening nut B is deformed while deforming the flexible abutting body.
And the tightening ring C (see FIG. 3).

[0015]

According to the first aspect of the present invention, the flexible annular contact piece is pressed against the inner peripheral surface of the pipes to be joined while absorbing the dimensional difference of the inner peripheral faces of the pipes to be joined, thereby forming the sealing core and the pipe to be connected. Achieve a seal between. In the invention of the second aspect, since the flexible abutment formed on the end surface of the sealing core forms a gap for advancing allowance of the water pipe between the joint core and the joint main body, the tightening ring is used together with the tightening ring when tightening the tightening nut. The water pipe can be moved,
The supporting force of the connected pipe by the tightening ring is reliably retained.

[Brief description of drawings]

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

FIG. 2 is a sectional view of an initial stage of pipe connection operation according to the above.

FIG. 3 is a cross-sectional view when the pipe connection is completed according to the above.

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

FIG. 5 is an enlarged cross-sectional view showing a state of a pipe to be connected at the time of connection.

[Explanation of symbols]

F Sealing core P Connected pipe P ₁ End surface 10 Fitting pipe portion 11 Flexible annular contact piece 12 Flange 15 Flexible abutment body

Claims (2)

[Claims] 1. A fitting pipe portion to be inserted into a pipe to be connected and a flange portion that comes into contact with an end face of the pipe to be connected, and are integrally formed of a synthetic resin material, and the outer peripheral surface of the pipe pipe is provided. A sealing core for a pipe joint, comprising a flexible annular contact piece continuous in the circumferential direction. 2. A fitting pipe portion to be inserted into a pipe to be connected and a flange portion that comes into contact with an end surface of the pipe to be connected, and are integrally formed of a synthetic resin material, and an end surface of the flange portion of the joint body is formed. A core for sealing a pipe joint, comprising a flexible abutting member that abuts against a receiving step portion.