JP2571278Y2 - Pipe fittings - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting a corrugated pipe and a plastic pipe.

[0002]

2. Description of the Related Art Pipe joints for connecting a corrugated pipe and a plastic pipe are being used in a portion where a gas pipe enters a gas meter from a buried part. As such a pipe joint, there is one disclosed in Japanese Utility Model Application Laid-Open No. 63-190688, which is a pipe joint for connecting a flexible pipe whose outer surface is coated with a resin to a plastic pipe, and which is connected to the flexible pipe. A pipe joint body having a screw on the outer peripheral surface on the side thereof, the inner peripheral surface of which is a cylindrical inner peripheral surface, and a resin-coated outer surface on the connection side of the plastic pipe, and a radial groove formed on the inner peripheral surface thereof. And a resin-coated nut on the outer surface of a nut body having a flange at an end screwed to an external thread of the pipe joint body;
A retainer that has an outer peripheral surface that fits on the inner peripheral surface of the cylinder of the pipe joint body and has an inner peripheral surface that engages with the outer surface of the flexible pipe from which the resin coating has been removed; A stiffener having a cylindrical portion fitted to the inner peripheral surface of the plastic pipe; an annular rubber packing provided on a longitudinal surface of the flange resin coating of the nut; An annular rubber packing for sealing the resin coating and the resin coating of the pipe joint body, and an annular rubber packing provided on a longitudinal surface of the resin coating on an end side surface of the pipe joint body. Pipe fitting.

[0003]

The above-mentioned pipe joint has a problem that it has a large number of parts and is therefore expensive.
SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe joint for connecting a corrugated pipe and a plastic pipe which has a small number of parts and is inexpensive.

[0004]

According to the present invention, a convex is provided on the inner peripheral surface of the central portion of the joint body, a concave groove is provided on the inner peripheral surface of the corrugated tube side of the convex, and an O-ring is mounted. A groove is provided on the inner peripheral surface of the plastic tube side of the strip, the outer peripheral surface of the joint body is covered with a resin coating, and the resin coating is protruded toward the corrugated pipe side to form a concave groove on the inner peripheral surface of the protruding portion. Then, a watertight packing is attached, the resin coating is protruded toward the plastic pipe side, and packing is attached over the inner peripheral surface with the plastic pipe side end of the joint body, and the resin coating is applied from the corrugated pipe side end of the joint body. A stiffener is mounted on the inner peripheral surface to the plastic tube side end through the corrugated tube and the plastic tube, and the diameter of the stiffener is increased to form a groove provided on the corrugated tube side inner peripheral surface of the ridge. The O-ring is pressed by inserting the corrugated tube into the The distal end of the corrugated pipe projecting toward the plastic pipe side is held larger in diameter, and the plastic pipe is fitted into a concave streak provided on the inner peripheral surface of the convex pipe on the plastic pipe side, and protruded toward the plastic pipe side. The above object has been achieved by pressing the packing against the inner peripheral surface of the resin coating and the plastic tube side end of the joint body.

[0005]

[Action] A corrugated pipe having an insertion end machined into a cylindrical shape is inserted from the corrugated pipe side end of the joint main body, and the inserted end of the corrugated pipe is protruded toward the plastic pipe side from the protruding ridge of the joint main body. The jig is inserted from the plastic tube side end to expand the diameter of the inserted end of the corrugated tube. Next, insert the stiffener and the plastic pipe from the plastic pipe side end of the joint body,
By inserting a jig from the other end of the plastic pipe to expand the diameter of the stiffener, the corrugated pipe and the plastic pipe are connected by the main pipe joint. At that time, the corrugated pipe is flared on the plastic pipe side of the ridge of the joint body to oppose the pull-out force, and at the same time, achieves sealing of the internal fluid with the O-ring in the concave groove. The ridges of the ridges are cut into the ridges provided on the inner peripheral surface of the plastic pipe to counter the pull-out force and at the same time achieve the sealing of the internal fluid, and the watertight packing seals the gap between the corrugated pipe and the cladding pipe. The packing prevents the external fluid from entering from the pipe side, the packing prevents the external fluid from entering from the plastic pipe side, and thus the corrugated pipe and the plastic pipe are mutually sealed by the main pipe joint with a seal against the internal and external fluids. Connected.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows an embodiment of the present invention. This pipe joint comprises a joint body 1, a resin coating 9, a copper stiffener 4, a packing 5,
Each of the O-rings 6 and a watertight packing 7. A convex ridge 1a is provided on the inner peripheral surface of the central portion of the joint body 1, and two concave grooves 1b are provided on the inner peripheral surface on the left side of the drawing of the convex ridge 1a, and each of the concave grooves 1b is provided. An O-ring 6 is mounted. In addition, four concave stripes 1 are provided on the inner peripheral surface on the right side of the drawing of the convex stripe 1a.
c is provided. The outer peripheral surface of the joint body 1 is coated with a resin 9.
The resin coating 9 projects further to the left beyond the left end of the joint body 1 in the drawing,
A concave groove 9b is formed on the inner peripheral surface of the protrusion 9a,
A watertight packing 7 is mounted in the concave groove 9b. The resin coating 9 also projects to the right beyond the right end of the joint body 1 in the drawing, and the packing 5 is mounted over the inner peripheral surface of the projecting portion 9c and the right end of the joint body 1 in the drawing. . A stiffener 4 is mounted on the inner peripheral surface of the joint body 1 from the left end in the drawing to the right end in the drawing of the resin coating 9 via the corrugated pipe 3 and the polyethylene pipe 2 to be connected.

This embodiment is configured as described above.
Hereinafter, a method of using the pipe joint will be described. First, the packing 5 and the O are attached to the joint body 1 and the resin coating 9 which are integrally formed.
The ring 6 and the watertight packing 7 are assembled. On the other hand, the corrugated tube 3 cuts off the cladding tube 8 on the insertion end side and processes the insertion end into a cylindrical shape. Thereafter, the insertion end of the corrugated pipe 3 is inserted from the left side of the joint body 1 in the drawing, and the inserted end is projected to the right side of the joint body from the ridge 1a of the joint body. (Not shown), and the insertion end of the corrugated tube is expanded in diameter to form a flared portion 3a. Next, from the right side of the drawing of the joint body, a stiffener 4 and a polyethylene pipe 2
And insert At this time, it is preferable that the stiffener 4 is formed so that the corrugated tube side has a small diameter and the polyethylene tube side has a large diameter so that the position of the stiffener 4 is determined so as to abut the flared portion 3a of the corrugated tube. Thereafter, a jig (not shown) is inserted from the other end of the polyethylene pipe, and the stiffener 4 is formed at the concave groove 1b and the concave strip 1c of the joint body.
Expand the diameter.

Accordingly, the corrugated tube 3 and the polyethylene tube 2
Is connected by the main pipe joint, and at this time, the flared portion 3a of the corrugated pipe engages with the ridge 1a of the joint main body to exert a pull-out preventing force. Further, the outer surface of the corrugated tube 3 bites into the concave groove 1b of the joint main body to exert a further pull-out preventing force, and furthermore, the corrugated tube 3 bites into the concave groove 1b to bite into the inner surface of the corrugated tube 3, and the stiffener 4 Since the diameter of the ridge 1a of the joint body is enlarged on the right side of the drawing, the corrugated tube 3 is prevented from coming off even through the stiffener 4. On the other hand, the polyethylene pipe 2 bites into the concave streak 1c of the joint body and is similarly prevented from coming off.

Further, the outer surface of the corrugated tube 3 is sealed between the O-ring 6 in the groove 1b and the outer surface of the polyethylene tube 2 is sealed by biting into the groove 1c. Completely sealed. On the other hand, the watertight packing 7 seals between the main pipe joint and the cladding pipe 8 of the corrugated pipe to prevent the intrusion of external fluid from the corrugated pipe 3 side, and the packing 5 connects the main pipe coupling and the polyethylene pipe 2 to each other. Sealing prevents the intrusion of external fluid from the polyethylene tube 2 side, and thus the corrugated tube 3
The polyethylene pipe 2 and the polyethylene pipe 2 are connected to each other by a main pipe joint while having a sealing property against internal and external fluids. Thus, the parts configuration of the main pipe joint is simple, and thus the main pipe joint is an inexpensive pipe joint.

FIG. 2 shows another embodiment of the present invention. This embodiment shows a pipe joint having a protective tube 10 on the outer surface of the cladding tube 8 on the outer surface of the corrugated tube 3. . The protective tube 10 is provided to prevent the corrugated tube 3 from being crushed when buried, and to prevent aging due to sunlight or damage due to the external environment when exposed piping, and the outer surface thereof is axially oriented as shown in the figure. It is formed in an uneven shape, and is attached to the outer surface of the cladding tube 8 by a cap 11. In this embodiment, however, the projecting portion 9a of the resin coating 9 on the corrugated tube side (left side in the drawing) protrudes further than the previous embodiment, and expands toward the front end side (left side) toward the front end side. A tapered inner surface 9d is formed, and a tip portion (left end portion)
Are formed with windows 9f, 9f extending in the circumferential direction except for connecting portions 9e, 9e separated by 180 ° in the circumferential direction.

A second watertight packing 12 is mounted on the inner surface 9d of the taper of the resin coating.
Is sealed between the tapered inner surface 9d and the outer surface of the protection tube 10 by the diameter reducing action of the tapered inner surface 9d. A stopper 13 shown in FIG. 3 is attached to the resin-coated window 9f . The stopper 13 is a pair of fitting portions 13 that penetrate the windows 9f, 9f and fit into the outer surface recess of the protective tube 10.
a, 13a and a connecting portion 13b for connecting the fitting portions 13a, 13a so as to be able to expand in diameter. After the protective tube 10 is inserted into the main pipe joint, the connecting portion 13e of the resin coating straddles one connecting portion 9e. Push in the stopper 13 to remove the protection tube 10
This is intended to prevent slippage. Also in this pipe joint,
The same effect as in the previous embodiment can be obtained.

[0012]

According to the present invention, there is provided a pipe joint for connecting a corrugated pipe and a plastic pipe, which has a small number of parts and is inexpensive.

[Brief description of the drawings]

FIG. 1 is an upper half cross-sectional lower half front view showing one embodiment of the present invention.

FIG. 2 is a lower half front view of an upper half section showing another embodiment.

FIG. 3A is a plan view and FIG. 3B is a front view showing the stopper of the embodiment.

[Explanation of symbols]

1. Joint body 1a ... Protrusion 1
b: concave groove 1c: concave streak 2: polyethylene pipe 3
... corrugated pipe 3a ... flare processing part 4 ... stiffener 5
... packing 6 ... O-ring 7 ... watertight packing 8
... Coating tube 9 ... Resin coating 9a, 9c ... Protrusion 9
b: concave groove 9d: tapered inner surface 9e: connecting portion 9
f: Window 10: Protection tube 11: Cap 1
2 Second watertight packing 13 Stopper 13a Fitting part 1
3b ... connecting part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shigeru Mizutani 2nd Daifuku Kuwana-shi, Mie Hitachi Metals Co., Ltd. Kuwana Plant (56) References (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A pipe joint for connecting a corrugated pipe and a plastic pipe, wherein a convex is provided on an inner peripheral surface of a central portion of a joint body, and a concave groove is provided on an inner peripheral surface of the corrugated pipe on a corrugated tube side. Attach a ring, provide a concave strip on the inner peripheral surface of the plastic pipe side of the convex,
The outer peripheral surface of the joint body is covered with a resin coating, the resin coating is protruded toward the corrugated tube, a concave groove is formed on the inner peripheral surface of the protruding portion, and watertight packing is attached. The joint is mounted on the inner peripheral surface of the joint body from the corrugated tube side end to the resin-coated plastic tube side end of the joint body. that a through the plastic tube fitted with a stiffener, the diameter increases the stiffener
The wave is formed in a groove provided on the inner peripheral surface of the ridge on the corrugated tube side.
The O-ring is pressed by inserting the shaped pipe,
Expanding the tip of the corrugated tube that protrudes toward the plastic tube
Holds the recess provided on the inner peripheral surface of the ridge on the plastic tube side.
The plastic tube is inserted into the strip, and the plastic
Resin coating protruding to the pipe side and plastic of the joint body
A pipe joint in which the packing is pressed against an inner peripheral surface with a pipe side end .