JP2555119Y2 - 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 Laid-Open Publication 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 the connection of 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. A nut coated with resin on the outer surface of a nut body having a flange at an end screwed to an external thread of the pipe joint body, and an outer peripheral surface fitted to a cylindrical inner peripheral surface of the pipe joint body. The surface has a retainer engaged with the outer surface of the flexible tube from which the resin coating has been removed, a stiffener having a flange portion in contact with an end of the plastic tube and a cylindrical portion fitted to the inner peripheral surface of the plastic tube, and the nut The longitudinal direction of the resin coating on the collar An annular rubber packing provided on a surface, an annular rubber packing for sealing a resin coating extending from a nut body to a side opposite to a flange of the nut and a resin coating of the pipe joint body, and an end of the pipe joint body. A pipe joint comprising an annular rubber packing provided on a longitudinal surface of a resin coating on a side surface.

[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 ridge is provided on the inner peripheral surface of the central portion of the joint body, and the inner peripheral surface of the ridge on the corrugated tube side is fitted to the outer diameter of the O-ring mounted on the corrugated tube. Having an inner peripheral portion to be fitted, providing a concave strip on the plastic pipe side inner peripheral surface of the convex strip,
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. The above object has been achieved by mounting a stiffener via a plastic pipe and a stiffener, expanding the stiffener, and fixing the corrugated pipe and the plastic pipe to the inner peripheral portion of the joint body. Further, in the above, a concave groove may be further formed on the inner peripheral surface on the corrugated tube side, and when the corrugated tube is expanded in diameter via a stiffener, a part of the corrugated tube may be fitted into the concave groove.

[0005]

The corrugated pipe fitted with the O-ring is inserted from the corrugated pipe side end of the joint body to the tip valley, and the inserted end of the corrugated pipe is brought into contact with the ridge of the joint body. Next, the stiffener and the plastic pipe are inserted from the plastic pipe side end of the joint body, and the jig is inserted from the other end of the plastic pipe to expand the diameter of the stiffener. They are connected integrally.

At this time, the corrugated pipe is expanded and reinforced by a stiffener to prevent deformation when a pull-out force is applied, and at the same time, an O-tube mounted on the inner peripheral surface of the joint body and the valley of the corrugated pipe. Sealing of the internal fluid is achieved between the ring and the plastic pipe, which bites into the concave ridge provided on the plastic pipe side inner peripheral surface of the ridge of the joint body to counter the pull-out force and at the same time achieves sealing of the internal fluid. The watertight packing seals the gap between the corrugated pipe and the cladding pipe to prevent the intrusion of external fluid from the corrugated pipe side, and the packing prevents the inflow of external fluid from the plastic pipe side, and thus the corrugated pipe and plastic The pipes are connected to each other by a main pipe joint with a sealing property against internal and external fluids. Furthermore, when a concave groove is formed on the inner peripheral surface on the corrugated tube side, a part of the corrugated tube is fitted into the concave groove, so that it is possible to more firmly connect with the pulling force.

[0007]

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, and a watertight packing 7. A convex ridge 1a is provided on a central inner peripheral surface of the joint main body 1, and an inner peripheral surface 1b fitted to an outer diameter of the O-ring 6 mounted on the corrugated tube is provided on a left inner peripheral surface of the convex ridge 1a in the drawing. Is provided. Further, four concave stripes 1c are provided on the inner peripheral surface on the right side of the drawing of the convex stripes 1a. The outer peripheral surface of the joint body 1 is integrally coated with a resin coating 9, and the resin coating 9 projects further to the left beyond the left end in the drawing of the joint body 1, and is formed on the inner peripheral surface of the projecting portion 9 a. Has a groove 9b formed therein, and the watertight packing 7 is formed in the groove 9b.
Is installed. 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 a corrugated tube 3 and a polyethylene tube 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 watertight packing 7 are attached to the joint body 1 and the resin coating 9 which are integrally formed. On the other hand, in the corrugated tube 3, the cladding tube 8 on the insertion end side is cut off, and the O-ring 6 is attached to the valley. Thereafter, the insertion end of the corrugated tube 3 is inserted from the left side of the drawing of the joint main body 1, and the inserted end is brought into contact with the ridge 1a of the joint main body. Next, the stiffener 4 and the polyethylene pipe 2 are inserted from the right side of the drawing of the joint body. At this time, the stiffener 4 has a small diameter on the corrugated pipe side and a large diameter on the polyethylene pipe side so that the position of the stiffener 4 is determined.
Is preferably formed so as to abut on the ridge 1a. Thereafter, a jig (not shown) is inserted from the other end of the polyethylene pipe, and the diameter of the stiffener 4 is increased at the inner peripheral surface 1b and the concave streak 1c of the joint body.

Thus, the corrugated tube 3 and the polyethylene tube 2
The corrugated pipe is expanded by a stiffener and reinforced at this time to prevent deformation when a pull-out force is applied and exert a pull-out inhibiting force. 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.

The outer surface of the corrugated tube 3 is sealed between the inner peripheral surface 1b and the O-ring 6, and the outer surface of the polyethylene tube 2 is sealed by biting into the concave strip 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. . Protection tube
Numeral 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 uneven in the axial direction as shown. The cap 11
To the outer surface of the cladding tube 8. However, in this embodiment, the projecting portion 9a of the resin coating 9 on the corrugated tube side (left side in the drawing) protrudes further than in the previous embodiment, and the diameter of the resin coating 9 expands toward the front end side (left side). Tapered inner surface 9d
In addition, windows 9f, 9f extending in the week direction are formed at the front end portion (left end portion) except for connecting portions 9e, 9e separated by 180 degrees in the week direction.

A second watertight packing 12 is mounted on the inner surface 9d of the resin-coated taper.
The taper inner surface 9d is subjected to the diameter reducing action by the taper inner surface 9d,
A seal is provided between d and the outer surface of the protection tube 10. A stopper 13 shown in FIGS. 3 to 6 is mounted on the resin-coated window 9f. The stopper 13 penetrates the windows 9f, 9f and fits into a recess on the outer surface of the protective tube 10. 13a
And a connecting portion 13 for connecting the fitting portions 13a, 13a so as to be able to expand in diameter.
After inserting the protection tube 10 into the main pipe joint, the stopper 13 is pushed in so as to straddle one connecting portion 9e of the resin coating to prevent the protection tube 10 from coming off. Also in this pipe joint, the same effects as in the previous embodiment can be obtained.

FIG. 7 shows still another embodiment of the present invention. This embodiment is almost the same as the embodiment shown in FIG. 1, except that a concave groove is formed in the inner peripheral surface 1b of the joint body 1. 1d is further formed, and this concave groove 1d is formed between two O-rings mounted on the corrugated tube. In this case, as the stiffener, the one of the above-described embodiment which serves both for the corrugated tube and the polyethylene tube may be used.
It is preferable to use 4b. Accordingly, although the diameter expansion operation is performed separately for the corrugated pipe and the polyethylene pipe, a stronger pull-out preventing force can be obtained because the corrugated pipe is fitted into the concave groove. Other functions and effects can be obtained as in the above embodiment. FIG. 8 shows a fourth embodiment of the present invention. This embodiment is a combination of the embodiments shown in FIGS. 2 and 7, and its operation and effects are as described above.

[0014]

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 a lower half front view of an upper half section showing an embodiment of the present invention.

FIG. 2 is an upper half sectional lower half front view showing another embodiment.

FIG. 3 is a front view showing the stopper of the embodiment.

4 is a sectional view taken along line AA in FIG.

FIG. 5 is a sectional view taken along line BB in FIG. 3;

6 is a view taken in the direction of arrows CC in FIG. 3;

FIG. 7 is a lower half front view of an upper half section showing still another embodiment of the present invention.

FIG. 8 is a lower half front view of an upper half section showing a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Joint main body 1a ... Convex ridge 1b ... Inner peripheral surface 1c ... Concave ridge 2 ... Polyethylene pipe 3 ... Corrugated pipe 4 ... Stiffener 5 ... Packing 6 ... O-ring 7 ... Watertight packing 8 ... Coated pipe 9 ... Resin coating 9a, 9c ... Projecting part 9b ... concave groove 9d ... taper inner surface 9e ... connecting part 9f ... window 10 ... protective tube 11 ... cap 12 ... second watertight packing 13 ... stopper 13a ... fitting part 13b ... connecting part 1d ... concave groove 4a, 4b ... Stiffener

Claims (2)

(57) [Scope of request for utility model registration] 1. A pipe joint for connecting a corrugated pipe and a plastic pipe, wherein a ridge is provided on an inner peripheral surface of a joint body, and an O attached to the corrugated pipe is provided on an inner peripheral surface of the ridge on a corrugated pipe side. An inner peripheral portion fitted to the outer diameter of the ring, a concave streak provided on the plastic tube side inner peripheral surface of the convex streak, and an outer peripheral surface of the joint body covered with a resin coating; Side, and a concave groove is formed in the inner peripheral surface of the protruding portion, watertight packing is attached, and the resin coating is protruded toward the plastic pipe to extend over the inner peripheral surface with the plastic pipe side end of the joint body. Attach packing, attach a stiffener to the inner peripheral surface from the corrugated pipe side end of the joint body to the plastic coated plastic pipe end via the corrugated pipe and the plastic pipe, and expand the stiffener. The corrugated pipe and the plastic pipe are fixed to the inner peripheral part of the joint body. A pipe joint characterized by the following. 2. A pipe joint for connecting a corrugated pipe and a plastic pipe, wherein a convex ridge is provided on an inner peripheral surface of the joint body, and an O attached to the corrugated pipe is provided on an inner peripheral surface of the convex ridge on a corrugated pipe side. An inner peripheral portion fitted to the outer diameter of the ring, a concave streak provided on the plastic tube side inner peripheral surface of the convex streak, and an outer peripheral surface of the joint body covered with a resin coating; Side, and a concave groove is formed in the inner peripheral surface of the protruding portion, watertight packing is attached, and the resin coating is protruded toward the plastic pipe to extend over the inner peripheral surface with the plastic pipe side end of the joint body. Attach the packing, form a concave groove on the inner peripheral surface on the corrugated tube side,
A stiffener is attached to each end inner peripheral surface of the corrugated pipe and the plastic pipe, the diameter of each stiffener is expanded, and a part of the corrugated pipe side is fitted in the concave groove, and the corrugated pipe and the plastic pipe are connected to each other. Is fixed to an inner peripheral portion of the joint main body.