JPH01126122A - Pipe fitting structure for corrugated pipe - Google Patents

Abstract

PURPOSE:To enable performing connection of a corrugated pipe made of resin by inserting a core member into the end of said corrugated pipe, fitting a ferrule to the outer periphery of the corrugated pipe, and biasing said ferrule by a connection nut screwed to a fitting body part connected to said core member. CONSTITUTION:A core member 12 formed into an integral part with a fitting body part 13 is inserted into a corrugated pipe 11 provided with a packing 16 at the inner periphery, and a ferrule 15 is fitted over the outer periphery of said corrugated pipe 11. Then, a connection nut 14 is screwed and fastened to said fitting body part 13, a ferrule 15 is biased by said connection nut 14, and a corrugated pipe 11 together with said packing 16 is held between the ferrule 15 and core member 12.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pipe joint structure for corrugated pipes, and particularly to a pipe joint structure for corrugated pipes that can easily connect resin-made corrugated pipes. be.

[Conventional technology]

In recent years, various products have been used as protective tubes for T1 wires and cables. Corrugated pipes have been put into practical use, and various types of joints for corrugated pipes have been devised. FIG. 5 shows an example of a conventional pipe joint. This pipe joint 1 is composed of a joint body 2, a cap nut 3, and a retaining ring 4.

The tip of the presser ring 4 is engaged with the trough on the outer periphery of the corrugated pipe 5, and the cap nut 3 is tightened to the joint body 2. It is connected by crushing it in the direction.

[Problem that the invention seeks to solve]

However, although the above-mentioned method is effective for connecting corrugated pipes made of Gold B, it is not suitable for connecting corrugated pipes made of resin that are prone to creep because the connection is made by compressing and crushing the tip of the corrugated pipe. could not be used.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a pipe joint structure for corrugated pipes that can also be used to connect corrugated pipes made of resin that are prone to creep.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention inserts a core member into the tube end of a corrugated pipe provided with packing on the inner or outer periphery, and attaches a presser ring to the outer periphery of the corrugated pipe, and the presser ring is pressed by a connecting nut screwed into the joint body connected to the core member,
It is characterized in that the corrugated pipe is held between a holding ring and a core member.

(Function) Therefore, corrugated pipes can be connected without being extremely deformed, and corrugated pipes made of resin can also be connected.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

First, FIG. 1 is a sectional view showing a first embodiment of the pipe joint structure of the present invention, in which the pipe joint 10 has an integrally formed core member 12 that is inserted into the pipe from the pipe end of a corrugated pipe 11. It is composed of a joint main body 13, a connecting nut 14 that is screwed into the joint main body 13, and a presser ring 15 that slides on the inner periphery of the connecting nut 14, and has a packing 16 on the inner periphery.
The core member 12 is attached to the corrugated pipe 11 having a
At the same time, the retaining ring 15 is attached to the outer periphery of the corrugated pipe 11, the connecting nut 14 is screwed onto the joint body 13, and tightened, and the retaining ring 15 is pressed with the connecting nut 14, so that the retaining ring 15 and the core The corrugated pipe 11 is held between the member 12 and the packing 16.

The packing 16 is formed to fit into the four inner circumferential portions 11a of the corrugated pipe 11, project slightly from the inner circumference, and come into contact with the outer circumferential surface of the core member 1.2.

Also, the sliding contact surface 17 between the connecting nut 14 and the retainer ring 15
is formed in a tapered surface that gradually widens toward the joint body 13, and by tightening the connecting nut 14 to the joint body 13 with the retainer ring 15 in contact with the joint body 13, the retainer ring 15 to reduce the diameter,
This makes the connection of the corrugated pipe 11 more reliable. This presser ring 15 may be a split ring or may have a plurality of split grooves formed in the tapered surface portion to further facilitate the diameter reduction.

By configuring the pipe joint 10 in this way, it is possible to reliably connect the corrugated pipe 11 without extremely deforming it, so that it can be used to connect both metal and resin corrugated pipes. In addition, since the sliding surface 1r of the connecting nut 14 and the holding ring 15 is pressed as a tapered surface, even when stress is applied to the corrugated pipe 11 in the direction of pulling out, the tightening of the tapered surface becomes a force in the direction. The pipe 11 will not come off from the pipe joint 10.

Next, FIG. 2 shows a second embodiment of the present invention, in which a core member 22 is formed separately from a joint body 23, and a packing 26 is provided on the outer periphery of a corrugated pipe 21.

In this example, the corrugated pipe 21 is connected by inserting the core member 22 from the pipe end, fitting the protrusion 26a formed on the inner periphery of the packing 26 into the recess 21a on the outer periphery of the corrugated pipe 21, and then inserting the push ring. 28 is similarly fitted into the recess 21a on the outer periphery of the corrugated pipe 21.

When the connecting nut 24 is screwed onto the joint body 23 and tightened, the tapered surface 24a of the connecting nut 24 presses the tapered surface 25a' of the retaining ring 25, reducing the diameter of the retaining ring 25, and the piston is tightened. 26 toward the core member 22 to separate the corrugated pipe 21 and the core member 2.
2 into close contact with each other, press the retainer ring 25 toward the joint body 23, and press the presser ring 28. The flange 22a of the core member 22 is connected to the joint main body 2 through the corrugated pipe 21.
Press 3.

As a result, the flange portion 22a of the core member 22 is crimped to the joint body portion 23 via the ring-shaped packing 29.

FIG. 3 shows a third embodiment of the present invention, which is an example applied to a 5-rugate tube having spiral irregularities.

Packing 3 provided on the outer periphery of this corrugated pipe 31
6 is formed like a flanged nut, and a female threaded spiral 36a is formed on the inner circumferential surface corresponding to the male threaded spiral 31a on the outer circumferential surface of the corrugated pipe 31, and a flanged portion is formed on the outer circumferential end. 36b is formed.

To connect the corrugated pipe 31 in this example, the core member 32 is inserted from the pipe end, and the internal thread 36a formed on the inner periphery of the packing 36 is screwed into the external thread 31a on the outer periphery of the corrugated pipe 31.

When the connecting nut 34 is screwed onto the joint body 33 and tightened, the connecting cut 34 presses the retainer ring 35 and presses the outer periphery of the packing 36 toward the core member 32, thereby tightening the corrugated pipe 31 and the core member. 32 and press the retaining ring 35 in the direction of the joint body 33, and press the collar 32a of the core member 32 into the ring-shaped packing 39 of the joint body 33 via the collar 36b of the packing 36 and the corrugated pipe 31. Crimp.

As shown in the second and third embodiments, if the core member is formed separately from the joint body, the corrugated pipe flall
! Installation of X-rays can be done in advance outside the site, making site work easier.

As shown in each example, the pipe joint of the present invention connects corrugated pipes with almost no deformation, so it can be used to connect various types of corrugated pipes, and can be made from synthetic resins such as polyethylene, polypropylene, steel, stainless steel, etc. A metal material such as Sudir or a composite corrugated pipe 43 in which a metal material 41 is coated with a resin material 42 as shown in FIG. 4 can also be used for reliable connection. It also has excellent sealing performance because it is tightened through the packing.

T above! Each member that makes up the ff joint is made of polyethylene.

It is made of synthetic resin such as polypropylene, polyphenylene sulfide with glass W4, or metal such as gunmetal, brass, stainless steel, etc. The most suitable material is selected depending on the material of the corrugated pipe to be connected and the conditions of the place of use. . Also, for packing, an elastic material such as synthetic rubber is used depending on the conditions.

〔Effect of the invention〕

As explained above, the present invention clamps the corrugated pipe through the packing by the core member inserted into the pipe and the holding ring pressed by the connecting nut, so that the corrugated pipe is not extremely deformed (connected). It is also possible to connect resin corrugated pipes.Furthermore, since the structure is simple and the number of parts is small, it can be provided at low cost.

[Brief explanation of the drawing]

1 is a sectional view showing a first embodiment of the pipe joint structure of the present invention, FIG. 2 is a sectional view showing the second embodiment, FIG. 3 is a sectional view showing the third embodiment, and FIG. The figure is a sectional view of a main part of a composite corrugated pipe, and FIG. 5 is a sectional view showing a conventional pipe joint. 11.21.31... Corrugated pipe 12,22.
32... Core member 13.23.33... Joint body part 14.24.34-... Connection nut 15.25
．． 35... Presser ring 16.26° 36... Packing force 1 factor 2 factor voice 3 ring 4 tomoe

Claims (1)

[Claims] 1. A joint main body in which a core member is inserted into the pipe end of a corrugated pipe with packing provided around the inner or outer periphery, a presser ring is attached to the outer periphery of the corrugated pipe, and the presser ring is connected to the core member. A pipe joint structure for a corrugated pipe, characterized in that the corrugated pipe is held between a retaining ring and a core member by pressing with a connecting nut screwed into the pipe.