JP2543976Y2 - Pipe fittings - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a pipe joint.

[0002]

2. Description of the Related Art As a pipe joint for connecting a connected pipe having an anticorrosive resin layer inside, a pipe section having a pipe thread for a connected pipe in a hole, a connecting flange protruding from the pipe section, and the like. ,
Was known to consist of

[0003] However, this pipe joint also needs to be provided with anticorrosion measures as in the case of a connected pipe.

[0004] Therefore, a pipe joint including a metal flange main body having a thread for a connected pipe on the inner peripheral surface of the hole and a resin anticorrosion core fixed to the flange main body has been proposed.

[0005]

In a pipe joint having the above-mentioned metal flange body and resin corrosion protection core, the resin corrosion protection core is formed by injection molding and integrated with the metal flange body.

Therefore, in this case, there is a possibility that the resin corrosion-preventive core contracts and easily comes off the metal flange main body.

In view of the above, the present invention provides a pipe joint in which a metal flange main body and a resin anticorrosion core are securely fixed, and the anticorrosion core does not come off even when the flange main body of the connected pipe is screwed. The purpose is to do.

[0008]

In order to achieve the above object, a pipe joint according to the present invention comprises a threaded portion for a connected pipe and a threaded portion for an anticorrosion core which are covered from both sides of a hole of a metal flange body. The connecting pipe and the resin anticorrosion core are each capable of being screwed and formed on the inner peripheral surface of the hole, and the connected pipe screw section and the anticorrosion core screw section are formed as right and left reverse screws. .

[0009]

The resin anticorrosion core is screwed onto the anticorrosion core screw of the metal flange main body, so that the resin anticorrosion core and the metal flange main body are integrated.

[0010] When the connected pipe is screwed onto the thread for the connected pipe of the metal flange body, the anticorrosion core tends to rotate in the same direction as the connected pipe with the rotation of the connected pipe. However, since the thread for the connected pipe and the thread for the anticorrosion core are left-right reverse screws, the anticorrosion core facing the connected pipe will also rotate in the screwing direction, and the anticorrosion core will not loosen further. It will be tightened.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows a pipe joint according to the present invention. The pipe joint comprises a metal flange body 1 and the flange body 1.
And a resin anticorrosion core 2 fixed to the core.

The metal flange body 1 has a cylindrical portion 3 and a mounting flange portion 4 projecting from the cylindrical portion 3 in an outer flange shape.
In the inner peripheral surface 6 of the hole 5, a thread 7 for a connected pipe and a thread 8 for an anticorrosion core are formed.

That is, the hole 5 of the flange main body 1 includes a tapered hole 9, a small diameter portion 10 having a diameter smaller than the small diameter end of the tapered hole 9, and a large diameter portion 11 at the end. The threaded portion 7 for the connected pipe is formed in the portion 9, and the threaded portion 8 for the anticorrosion core is formed in the small diameter portion 10.

Accordingly, the anticorrosion core thread 8 is provided on the inner diameter side of the connected pipe thread 7.

The anticorrosion core 2 made of resin comprises a cylindrical portion 12,
An outer flange portion 13 protruding from the base end of the cylindrical portion 12, and the outer flange portion 13 is fitted into the large diameter portion 11 of the hole 5 of the flange body 1.

On the outer peripheral surface on the base end side of the cylindrical portion 12, a joining screw portion 14 screwed to the anticorrosion core screw portion 8 is provided.
A threaded or independent ring-shaped small ridge 15 is provided on the outer peripheral surface on the tip side of the screw portion 14.

When the joining screw portion 14 is screwed into the anticorrosion core screw portion 8, the outer flange portion 13 fits into the large diameter portion 11 of the hole 5 and the outer peripheral surface of the cylindrical portion 12. A gap 16 is formed between the screw portion 7 and the connected pipe thread 7.

In this case, however, the thread 7 for the connected pipe is used.
The anticorrosion core screw portion 8 is a left-right reverse screw.

That is, for example, when the connected pipe 17 rotates in the direction of arrow A and advances in the direction of arrow B with respect to the threaded portion 7 for connected pipe, and is screwed together, the anticorrosion core 2 also moves in the direction of arrow A. By rotating, it advances in the direction of arrow C and is screwed into the anticorrosion core screw portion 8.

Conversely, when the connected pipe 17 rotates in the direction of arrow D to advance in the direction of arrow B with respect to the thread portion 7 for connected pipe, the anticorrosion core 2 also rotates in the direction of arrow D to prevent corrosion. It advances in the direction of arrow C and is screwed into the core screw portion 8.

Normally, the thread 7 for the pipe to be connected has a right-hand thread, and the thread 8 for the anticorrosion core has a left-hand thread. The screw portion 8 may be a right-hand thread.

The large diameter portion 11 of the hole 5 of the flange body 1
An adhesive pool 20 is provided on the end face 19.

That is, when the flange main body 1 and the anticorrosion core 2 are screwed together, for example, an epoxy resin-based adhesive S is applied to the anticorrosion core screw portion 8 and the like. The adhesive S that is about to protrude from the portion A between the inner peripheral surface of the diameter portion 11 and the outer peripheral surface of the outer flange portion 13 is deposited in this adhesive pool.
It is stored in 20 so that it does not protrude.

Thus, the connected pipe 17 is connected to the metal pipe main body 21.
And an anticorrosion resin layer 22 attached to the inner surface of the metal pipe main body 21
The end male screw portion 18 is formed on the outer peripheral surface of the end portion of the metal pipe main body 21.

The small ridge 15 of the anticorrosion core 2 is connected to a pipe to be connected.
The dimensions are set so as to be in contact with the inner peripheral surface of the resin layer 22.

That is, when the male thread 18 of the pipe 17 is screwed into the thread 7 for the pipe, the end of the pipe 17 enters the gap 16 and the resin layer of the pipe 17 The small ridges 15 are made to gradually bite into the inner peripheral surface of 22, or the small ridges 15 themselves are crushed.

When connecting the connected pipe 17 to the pipe joint constructed as described above, the connected pipe 17 is screwed forward in the direction of arrow B, and the external male threaded portion 18 is connected to the flange body 1.
Is screwed to the threaded portion 7 for the connected pipe.

At this time, the small ridge 15 of the anticorrosion core 2 is
Since the core 17 is pressed against the inner peripheral surface of the resin layer 22, the anticorrosion core 2 tries to rotate in the same direction as the connected pipe 17.

However, since the thread 7 for the pipe to be connected and the thread 8 for the anticorrosion core have opposite left and right threads, the anticorrosion core 2
Is rotated in the direction to be rotated, it advances in the direction of arrow C, and is further tightened.
During the connection work, the anticorrosion core 2 does not return.

When the pair of connected pipes 17 are connected, the pair of pipe joints configured as described above is used. That is, a sealing material is interposed between the mating surfaces 34, 34 of the joints, and the mounting flanges 4, 4 of the joints are connected by bolt-nut coupling. 23 is a through hole for connection.

Accordingly, in the connected state (connected pipe connection state), the entire inner peripheral surface of the formed flow path is covered with the resin, exhibiting excellent corrosion resistance.

Further, according to the above-described embodiment, since the anticorrosion core screw portion 8 is provided on the inner diameter side than the connected pipe screw portion 7, it is easy to process, and furthermore, the anticorrosion core screw portion of the anticorrosion core 2 is provided. The thickness of the corresponding portion 24 can be reduced, and local contraction can be prevented.

Further, even when the connected pipe 17 is screwed deeply, the end face 25 of the connected pipe 17 comes into contact with the lower part of the hole 5,
The anticorrosion core 2 is not pressed in the direction of arrow B, so that the core is prevented from coming off.

FIG. 2 shows another embodiment. In this case, the hole 5 of the metal flange body 1 is composed of a large diameter portion 11 and a tapered hole 9. , Circular recess 11a
And a circumferential groove 11b provided on the outer peripheral side thereof.

On the inner peripheral surface of the large diameter portion 11, a thread 8 for the anticorrosion core is provided.

The resin-made anticorrosion core 2 comprises a cylindrical portion 12 and an outer flange 13 projecting from the base end of the cylindrical portion 12 as in the above-described embodiment. On the outer peripheral surface is provided a joining screw portion 14 with which the anticorrosion core screw portion 8 is screwed.

In this case, a concave portion 28 is provided on the back surface of the outer flange portion 13 so as to be fitted to the projection 27 of the flange main body 1, and the cylindrical portion 12 has a large diameter portion 29 and a small diameter portion 30. The gap 16 is formed between the small diameter portion 30 and the thread 7 for the connected pipe.

The base end 31 of the thread 7 for the connected pipe of the flange main body 1 is set so as to slightly bite into the large-diameter portion 29 of the anticorrosion core 2. Centering is planned.

The inner peripheral surface of the anticorrosion core 2 (specifically, a portion corresponding to the outer flange portion 13) is formed with recesses 32 arranged at a predetermined pitch along the circumferential direction. This is a locking portion used when the anticorrosion core 2 is screwed into the flange main body 1. Although the recess 32 is omitted in FIG. 1, it is of course preferable to provide the recess. In FIG. 2, the small protrusions 15 on the outer peripheral surface of the cylindrical portion 12 of the anticorrosion core 2 are not shown, but it is of course preferable to provide the small protrusions 15.

Accordingly, also in the pipe joint shown in FIG. 2, since the thread 7 for the connected pipe and the thread 8 for the anticorrosion core are left-right reverse threads, like the pipe joint shown in FIG. When connecting the connection pipe 17, the anticorrosion core 2 is further tightened without loosening.

In the embodiment shown in FIG. 2, since the outer flange 13 of the anticorrosion core 2 is provided with the concave portion 28, the thickness of the outer flange 13 is reduced, and the resin shrinkage force is reduced. Since the protrusion 27 of the flange main body 1 is fitted into the recess 28, the contraction in the inner diameter direction is effectively prevented.

[0043]

The present invention is constructed as described above and has the following effects.

Since the resin-made anticorrosion core 2 is screwed into the anticorrosion core thread portion of the metal flange main body 1 and is securely fixed to the flange main body 1, the pipe joint is formed by the flange main body 1.
And the anticorrosion core 2 hardly come off and have excellent durability. Moreover, when the connected pipe 17 is screwed into this pipe joint, the anticorrosion core 2 tries to rotate in the screwing direction without rotating in the loosening direction, and the anticorrosion core 2 can be effectively prevented from coming off.

In addition, in the connected pipe connection state, the entire inner peripheral surface of the formed flow path is covered with the resin, thereby exhibiting an excellent anticorrosion effect.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a main part of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal flange main body 2 Resin anticorrosion core 5 Hole 6 Inner peripheral surface 7 Thread for connected pipe 8 Thread for anticorrosion core 17 Connected pipe

Claims (1)

(57) [Scope of request for utility model registration] 1. A thread 7 for a connected pipe and a thread 8 for an anticorrosion core are formed so that a connected pipe 17 and a resin anticorrosion core 2 can be screwed from both sides of a hole 5 of a metal flange body 1 respectively. The threaded portion 7 for the connected pipe formed on the inner peripheral surface 6 of the hole 5
A pipe joint, characterized in that the anticorrosion core screw portion 8 and the anticorrosion core screw portion 8 are reversely threaded.