JPH10220679A - Joint structure of synthetic resin pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To join synthetic resin pipes with ease regardless of weather conditions without machining the outer peripheral surface and fixing the pipe end section for a long time. SOLUTION: This structure comprises a plurality of ring-like grooves 5A, which are formed in the outer peripheral surface of the end section 5 of a pipe in parallel with each other, a plurality of claws 6A, which are formed in the end section 6 of another pipe, whose hole is expanded so as to be inserted by the end section 5 of the former pipe, and are meshed with the ring-like grooves 5A, and a packing 7, which intervenes between the end face of the end section 5 of the former pipe and the inner face of the end section 6 of the later pipe. Each of the claws 6A meshes with the ring-like grooves 5A only when the tensile force works against both end sections 5 and 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a synthetic resin pipe, and more particularly to a joint structure for a synthetic resin pipe which can easily join synthetic resin pipes by simply pushing the synthetic resin pipe. is there.

[0002]

2. Description of the Related Art To join polyethylene synthetic resin pipes conventionally used for water pipes and the like, as shown in FIG. The other pipe end 2 is fitted, and a heating wire 4 embedded in the joint 3 is energized to melt and integrate the outer peripheral layers of both the pipe ends 1 and 2 and the inner peripheral layer of the joint 3.

[0003]

However, the above-mentioned prior art has the following problems. Prior to joining, it is necessary to cut the outer peripheral surfaces of both pipe ends 1 and 2 to remove a deteriorated portion due to oxidation and the like, and then to completely wipe off oil and the like on the cut surface, which is troublesome. During energization, both tube ends 1 and 2 must be fixed for a long time by a clamp, and it takes time to join. In the case of rain or the like, if the pipe ends 1 and 2 are exposed to water, joining cannot be performed.

Accordingly, an object of the present invention is to make it possible to easily join synthetic resin pipes to each other without cutting the outer peripheral surface or fixing the pipe ends for a long time regardless of the weather. It is to provide a joint structure for a synthetic resin pipe.

[0005]

According to the first aspect of the present invention,
A plurality of annular grooves formed parallel to the outer peripheral surface of one tube end; and a plurality of annular grooves formed in the other tube end into which the one tube end is inserted so as to be insertable, and meshing with the annular groove. And a packing interposed between the end surface of the one tube end and the inner surface of the other tube end. Each of the plurality of claws has a tensile force applied to the tube end. It is characterized in that it engages with the annular groove only when it acts.

The invention according to claim 2 is characterized in that a gap between the one pipe end and the other pipe end is filled with a sealant. The invention according to claim 3 is characterized in that a plurality of annular grooves formed in parallel with the outer peripheral surface of each of the one end of the pipe and the other end of the pipe, A tubular joint member attached to the joint member, wherein the joint member includes a plurality of claws that mesh with the annular grooves of the two tube ends when the two tube ends are inserted into the joint member. An annular projection that abuts against the pipe end surfaces of both pipe ends when both pipe ends are inserted into the joint member;
A packing interposed between the pipe end faces of the both pipe ends and the annular projection, and each of the plurality of claws is provided with the annular shape only when a tensile force is applied to the both pipe ends. The feature is that it meshes with the groove.

The invention according to claim 4 is characterized in that a gap between the two pipe ends and the joint member is filled with a sealant.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the joint structure for a synthetic resin pipe according to the present invention will be described with reference to the drawings.

FIG. 1 is a partial sectional view showing a joint structure of a synthetic resin pipe according to the present invention. As shown in FIG. 1, a joint structure of a synthetic resin pipe according to the present invention includes a plurality of annular grooves 5A formed parallel to the outer peripheral surface of a pipe end 5 of one polyethylene synthetic resin pipe, and one pipe. The end 5 comprises a claw 6A formed in the tube end 6 of the other polyethylene synthetic resin tube expanded so as to be insertable and engaging with the annular groove 5A.
A plurality of claws 6A are formed in the other tube end 6 at intervals in the circumferential direction. Each of the plurality of claws 6A is
Only when a pulling force is applied to both tube ends 5, 6, it engages with the annular groove 5A.

The claw 6A may be formed integrally with the other tube end 6 by an injection molding method, or may be formed separately.
May be fusion-bonded to the inner surface of the other tube end 6. Nail 6A
Always has an elastic force directed toward the center of the pipe end 6. Therefore, when one pipe end 5 is inserted into the expanded other pipe end 6, the claw 6A sequentially climbs over the peaks forming the annular groove 5A, enters the predetermined annular groove 5A, and meshes. . Then, once they are engaged, both pipe ends 5, 6
, One tube end 5 does not come out of the other tube end 6. That is, each of the plurality of claws 6A meshes with the annular groove 5A only when a tensile force is applied to both tube ends 5, 6.

A packing 7 such as an O-ring is interposed between the end face of one pipe end 5 and the inner face of the other pipe end 6 in order to further improve the sealing performance of the joint. Filling the gap between one tube end 5 and the other tube end 6 with a sealing agent further improves the sealing performance.

According to the joint structure of the present invention having the above-described structure, simply pushing one pipe end 5 into the other expanded pipe end 6 allows the two pipe ends 5, 6 to be pushed. Can be joined. The packing 7 is fitted in advance in a groove 7A formed on the inner peripheral surface of the other tube end 6.

Next, another joint structure of the present invention will be described with reference to the drawings. FIG. 2 is a partial sectional view showing another joint structure of the present invention. As shown in FIG. 2, this joint structure includes a plurality of annular grooves 8A formed in parallel with the outer peripheral surface of each of one pipe end 8 and the other pipe end 9,
9A, and a tubular joint member 10 attached to both pipe ends 8, 9 so as to straddle these outer peripheral surfaces.

When the two pipe ends 8, 9 are inserted into the joint member 10, the joint member 10 has the annular grooves 8 formed in the two pipe ends 8, 9.
A, 9A, a plurality of claws 11 meshing with each other, and both pipe ends 8, 9
The annular projections 12 which come into contact with the pipe end faces of both pipe ends 8, 9 when the pipe is inserted into the joint member 10, and the packing interposed between the pipe end faces of both pipe ends 8, 9 and the annular projection 12 13

The claw 11 always has an elastic force directed toward the center of the two tube ends 8 and 9. Therefore, both pipe ends 8,
When the insert 9 is inserted into the joint member 10, the pawl 11 sequentially climbs over the hills forming the annular grooves 8A and 9A, enters the predetermined annular grooves 8A and 9A and meshes. Then, once they are engaged, even if a pulling force acts on both tube ends 8, 9,
The two pipe ends 8, 9 do not come out of the joint member 10. That is,
Each of the plurality of claws 11 is adapted to mesh with the annular grooves 8A, 9A only when a tensile force is applied to both tube ends 8, 9.

According to another joint structure of the present invention having such a structure, the two pipe ends 8, 9 are simply pushed into the joint member 10 so that the two pipe ends 8, 9 are joined together. Can be joined together. The packing 13 is fitted in advance in a groove 12A formed on the outer surface of the annular projection 12.

[0017]

As described above, according to the present invention, an annular groove is formed on the outer peripheral surface of a pipe end, and a claw that meshes with this groove is used to connect the inside of another expanded pipe or between pipes. By forming it in the joint member to be joined, it is possible to easily join the synthetic resin pipes without cutting the outer peripheral surface of the pipe end or fixing the pipe end for a long time, regardless of the weather Useful effects such as being able to do so.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a joint structure of a synthetic resin pipe according to the present invention.

FIG. 2 is a partial sectional view showing another joint structure of a synthetic resin pipe according to the present invention.

FIG. 3 is a sectional view showing a conventional technique.

[Explanation of symbols]

 1: One pipe end 2: The other pipe end 3: Joint 4: Heating wire 5: One pipe end 5A: Annular groove 6: The other pipe end 6A: Claw 7: Packing 7A: Groove 8: One tube end 8A: Annular groove 9: The other tube end 9A: Annular groove 10: The other tube end 11: Claw 12: Annular protrusion 12A: Groove 13: Packing

Claims (4)

[Claims] 1. A plurality of annular grooves formed in parallel with the outer peripheral surface of one tube end, and said one tube end formed in the other tube end expanded so as to be insertable. A plurality of claws meshing with an annular groove; and a packing interposed between an end surface of the one tube end and an inner surface of the other tube end, wherein each of the plurality of claws is the tube end. A joint structure for a synthetic resin pipe, characterized in that it engages with said annular groove only when a tensile force acts on the portion. 2. The joint structure for a synthetic resin pipe according to claim 1, wherein a gap between the one pipe end and the other pipe end is filled with a sealant. 3. A plurality of annular grooves formed in parallel with the outer peripheral surface of each of one end of the pipe and the other end of the pipe, and mounted on the two ends of the pipe so as to straddle these outer peripheral surfaces. A plurality of claws that engage with the annular grooves of the two pipe ends when the two pipe ends are inserted into the joint member; and the two pipe ends. An annular projection which comes into contact with the pipe end faces of the two pipe ends when the parts are inserted into the joint member, and a packing interposed between the pipe end faces of the two pipe ends and the annular projection. A joint structure for a synthetic resin pipe, wherein each of the plurality of claws is engaged with the annular groove only when a tensile force is applied to both pipe ends. 4. The joint structure for a synthetic resin pipe according to claim 3, wherein a gap between the two pipe ends and the joint member is filled with a sealant.