JPH0581588U - Pipe fitting - Google Patents

Abstract

(57) [Summary] [Object] To provide a pipe joint capable of reliably preventing liquid leakage between the outer peripheral surface of a corrosion-resistant core and the inner peripheral surface of an internal anticorrosion resin of a connected pipe. [Structure] A metal joint body 1 having a threaded portion 7 for a connected pipe and a resin anticorrosion core 2 are provided. On the outer end of the outer peripheral surface 14 of the tubular portion 12b of the anticorrosion core 2, a paste-like sealant 16 is applied.
And a thin metal ring 17 in the shape of a substantially disk spring that contacts the outside of the sealant 16 are attached. Outer peripheral surface 14 of tubular portion 12b
When the connected pipe 20 is inserted into the annular gap 15 between the connecting pipe 20 and the connected pipe thread portion 7 and the connected pipe 20 is screwed to the screw portion 7, the connected pipe 20 forms a thin metal ring. 17 is pressed inward to apply the sealant 16 to the outer peripheral surface 14 of the cylindrical portion 12b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint.

[0002]

[Prior Art]

 As shown in FIG. 6, a pipe joint for connecting a pipe to be connected having an anticorrosion resin layer inside is made of a metal joint body b having a thread portion a for the pipe to be connected, and a resin joint fixed to the joint body b. There is an anticorrosion core c.

That is, in order to connect the connected pipe d to this pipe joint, the threaded portion e of the connected pipe d is screwed into the threaded portion a of the joint body b, and the end of the connected pipe d is connected. The portion f is fitted into a gap portion g formed between the screw portion a and the outer peripheral surface of the tubular portion h of the anticorrosion core c.

Therefore, in order to prevent liquid leakage between the outer peripheral surface of the cylindrical portion h of the anticorrosion core c and the corresponding anticorrosion resin layer i inside the pipe d to be connected, It was necessary to interpose a sealant.

However, conventionally, in the pipe unconnected state, the outer peripheral surface of the cylindrical portion h of the anticorrosion core c is applied in a dot shape, a circumferential line shape, or a surface shape.

[0006]

[Problems to be solved by the device]

 However, since the sealing agent is tacky and semi-solid (clay-like), dust and the like adhere to the sealing agent during storage, and the sealing agent acts as a sealing agent in the pipe-connected state. It may not function sufficiently.

Further, when the connected pipe d enters the gap g while rotating around the axis thereof, the applied sealant is pushed and spread on the outer peripheral surface of the tubular portion h. At times, it is difficult to interpose the entire outer circumferential surface between the outer peripheral surface of the tubular portion h and the anticorrosion resin layer i of the connected pipe d, and in such a case, the sealing effect is reduced.

Therefore, in the present invention, if the connected pipe is connected even when it is stored for a long period of time, the liquid leakage between the outer peripheral surface of the anticorrosion core and the internal anticorrosion resin layer of the connected pipe can be surely performed. An object is to provide a pipe joint that can be prevented.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a pipe joint according to the present invention has a metal joint body having a threaded portion for a connected pipe, and an annular gap portion for fitting the connected pipe between the threaded portion. And a resin-made anticorrosion core having a tubular portion for performing a paste-like seal on the outer end of the outer peripheral surface of the tubular portion of the anticorrosion core when the pipe is not connected. The agent and a thin metal ring in the shape of an annular disk spring which are in contact with the outside of the sealing agent are attached.

[0010]

[Action]

 If the threaded part of the connected pipe is screwed into the threaded part for the connected pipe of the metal joint body and the end of the connected pipe is fitted into the annular gap, The thin metal ring in the shape of an annular disc spring is pressed inward, and the paste-like sealing agent on the inner surface side is pressed inward along the tubular portion. In other words, the thin metal ring acts as a so-called doctor knife, and the sealant is applied all around the outer peripheral surface.In the pipe connected state, the outer peripheral surface of the tubular portion of the anticorrosion core is connected to the outer peripheral surface. A sealant is interposed between the inner peripheral surface of the pipe and the pipe.

[0011]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment.

FIG. 1 shows a pipe joint according to the present invention, which includes a metal joint body 1 and a resin anticorrosion core 2.

The joint body 1 is composed of the tubular portion 3 and the mounting flange portion 4 projecting from the tubular portion 3 in an outer flange shape, and the inner peripheral surface 6 of the hole portion 5 is formed. The threaded portion 7 for the connected pipe is formed on.

That is, the hole portion 5 of the joint body 1 is provided with the tapered hole portion 8 and the base end large diameter portion 9, and the taper hole portion 8 is formed with the threaded portion 7 for the connected pipe.

Further, between the tapered hole portion 8 and the large diameter portion 9, there is provided a tapered portion 10 which is successively reduced in diameter toward the base end side, and a small diameter portion 11 which is connected to the small diameter end of the tapered portion 10. Be done.

The anticorrosion core 2 is composed of a cylindrical portion 12 and an outer flange portion 13 protruding from the base end of the cylindrical portion 12, and the cylindrical portion 12 includes a base portion 12a and a tubular portion 12b. Consists of.

The outer flange 13 is fitted to the large-diameter portion 9, the base 12a of the cylindrical portion 12 is fitted to the small-diameter portion 11 to the tapered portion 10, and the outer peripheral surfaces of the screw portion 7 and the cylindrical portion 12b are fitted. An annular gap 15 is formed between the gap 14 and the gap 14.

Then, the paste-like sealing agent 16 and the thin-walled metal ring 17 contacting the outside of the sealing agent 16 are attached to the outer end portion of the outer peripheral surface 14 of the tubular portion 12b.

That is, as shown in FIG. 3, the thin-walled metal ring 17 has an annular disc spring shape, and in the mounted state shown in FIG. 2, the outer peripheral wall 18 is successively reduced in diameter toward the outside. is doing.

If the thin metal ring 17 is made of aluminum (which undergoes sacrificial corrosion), zinc, tin, or a metal having a high ionization tendency, the pipe joint will be anticorrosive. Will be excellent. Further, as the metal ring 17, a foil-shaped one is particularly preferable.

By the way, in order to attach the thin-walled metal ring 17 and the sealant 16 to the cylindrical portion 12b, the sealant 16 is applied to the inner peripheral surface 19 of the thin-walled metal ring 17 in advance, and then the sealant 16 is applied. The thin metal ring 17 is fitted on the cylindrical portion 12b.

Therefore, this attaching work can be performed extremely easily and surely.

In addition to this, the sealant 16 may be circumferentially applied in advance to the outer end portion of the outer peripheral surface 14 of the cylindrical portion 12b, and then the metal ring 17 may be externally fitted.

The connected pipe 20 connected to this pipe joint, as shown in FIG. 1, includes a metallic pipe body 21, an anticorrosion resin layer 22 for covering the inner surface of the metallic pipe body 21, And the end male screw portion 23 is formed on the outer peripheral surface of the end of the metal pipe body 21.

Therefore, in order to connect the pipe 20 to be connected, the end of the pipe 20 to be connected is made to enter the gap 15 of the pipe joint, and the male screw end 23 is connected to the screw 7 for the pipe to be connected. When screwed, as shown in FIG. 4, the thin metal ring 17 is pressed by the end surface 24 of the connected pipe 20 as indicated by the arrow A, and is pressed to the inner part of the gap 15 along the tubular part 12b. To be done.

At this time, the sealing agent 16 disposed inside the thin-walled metal ring 17 is also pressed in the direction of arrow A, and with this pressing, the sealing agent 16 is applied to the outer peripheral surface 14 of the tubular portion 12b. Will be applied.

That is, since the outer peripheral wall 18 of the thin-walled metal ring 17 is successively reduced in diameter toward the outside, the sealing agent 16 disposed on the inner peripheral surface 19 side is pressed against the arrow A direction. At the same time, the sealing agent 16 is applied to the outer peripheral surface of the tubular portion 12b while being pressed and squeezed toward the inner diameter side. That is, the thin metal ring 17 acts as a doctor knife, and the sealant 16 is applied along the entire circumference of the outer peripheral surface of the tubular portion 12b.

Two pipe joints are used to connect the pair of connected pipes 20, 20 using the pipe joint configured as described above.

That is, a sealant may be interposed between the mating surfaces 26, 26 of the respective pipe joints, and the collar portions 4, 4 of the respective joints may be connected by bolt / nut coupling. 27 is a through hole for connection.

Next, FIG. 5 shows another embodiment. In this case, a spiral or independent small protrusion 28 is provided on the outer peripheral surface 14 of the tubular portion 12b of the anticorrosion core 2.

That is, when the pipe 20 to be connected is screwed, the small ridges 28 gradually bite into the inner peripheral surface of the anticorrosion resin layer 22 of the pipe 20 to be connected, or the small ridges 28 are pushed by themselves. I'm trying to get crushed.

Therefore, if the small protrusions 28 are provided, the outer peripheral surface 14 of the tubular portion 12b and the inner peripheral surface of the connected pipe 20 are surely brought into close contact with each other, and the connected pipe 20 is located in the gap portion 15. When entering and pressing the thin metal ring 17 to press the sealant 16, the small protrusions 28 can surely apply the sealant 16 to the outer peripheral surface 14 of the tubular portion 12b.

The present invention is not limited to the above-mentioned embodiment, and the design can be freely changed without departing from the gist of the present invention. For example, the metal joint body 1 has threaded portions for connected pipes at both ends. It may be a cylindrical type (that is, one that does not have the attachment flange portion 4) having, and may be an elbow type or a cheese type.

[0034]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects.

When the connected pipe 20 is connected, if the connected pipe 20 is screwed into the connected pipe thread portion 7 of this pipe joint, the connected pipe 20 enters into the gap portion 15 to make a thin wall. While the metal ring 17 is pressed inward and squeezed (that is, the thin metal ring 17 acts as a doctor knife), the sealant 16 is applied to the entire outer peripheral surface 14 of the tubular portion 12b of the anticorrosion core 2. In the pipe connected state, the sealing agent 16 is reliably interposed between the outer peripheral surface 14 and the inner peripheral surface of the pipe 20 to be connected, and an extremely excellent sealing effect is exhibited.

When the pipe is not connected, the sealant 16 is disposed on the inner peripheral surface 19 side of the thin metal ring 17, and the thin metal ring 17 allows the sealant 16 to be sealed from the outside. It is possible to prevent the adhesion of the like, and the sealing effect of the sealing agent 16 does not deteriorate in the pipe connected state.

To attach the sealing agent 16 and the thin metal ring 17 to the outer peripheral surface of the tubular portion 12 b of the anticorrosion core 2, for example, the sealing agent 16 is applied to the inner peripheral surface 19 of the thin metal ring 17 in advance. Then, if the thin-walled metal ring 17 is fitted onto the cylindrical portion 12b in this state, the attachment work can be performed very easily and reliably.

[Brief description of drawings]

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

FIG. 2 is an enlarged sectional view of a main part.

FIG. 3 is an enlarged cross-sectional view of a thin metal ring.

FIG. 4 is an enlarged view of a main part of a connected pipe connected state.

FIG. 5 is an enlarged view of a main part of another embodiment.

FIG. 6 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 Metal joint body 2 Resin anticorrosion core 7 Threaded part for connected pipe 12b Cylindrical part 14 Outer peripheral surface 15 Annular gap 16 Paste sealant 17 Thin metal ring

Front page continued (72) Inventor Shigeo Ueda 75 Nojiri, Ritto-cho, Kurita-gun, Shiga Sekisui Chemical Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A metal joint body 1 having a threaded portion 7 for a pipe to be connected, and a tubular portion 12b for forming an annular gap portion 15 for fitting a pipe to be connected between the metal body 1 and the threaded portion 7. A pipe joint comprising a resin anticorrosion core 2 and a paste sealant 16 on the outer end of the outer peripheral surface 14 of the tubular portion 12b of the anticorrosion core 2 in a pipe unconnected state. A pipe joint, characterized in that a thin metal ring (17) in the shape of a conical disc spring that contacts the outside of the sealant (16) is attached.