JPH022134Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a socket structure for a plastic tube, which is formed at one end of a plastic tube made of a pipe with a wall through-hole, and is used as a connection joint when connecting the tubes.

For example, in the general structure of a joint socket formed at one end of a plastic pipe used for sewage piping, the socket into which the cut end of the adjacent pipe is inserted has an enlarged-diameter stepped part; The ring bulge in the middle of the enlarged diameter step is formed by post-processing heat molding.
At the time of piping, the pipes are connected to each other by joints of rubber rings inserted into the ring bulges.

As described above, since the conventional socket part is formed by enlarging the diameter of the plastic tube itself by heat processing, thinning of the socket part is unavoidable, and it is necessary to prevent this thinning. There was a problem in that it required a complicated molding device.

In particular, when using a wall-through-hole tube with a large number of wall holes along the tube axis as a plastic tube, in addition to making the socket part thinner, it is necessary to reduce the heating during molding. Due to cooling, the outer periphery of the socket tends to be distorted or irregularly deformed in a wavy manner along the wall hole, resulting in a significant decrease in the strength of the tube. As a result, cracks often occur at the socket of pipes with holes in the pipe wall after they are put on the market, and the pipe bodies are easily damaged by shocks during burial or transportation. . Additionally, water leakage occurs between the undulating deformed surface on the inner periphery of the socket and the rubber seal, resulting in poor sealing performance.

In addition, conventional wall hole closing means used a method of closing the wall hole opening on the end face of the socket using a seal plug or a seal ring, but this method was only cumbersome to process. However, there was a problem in that it was difficult to obtain a reliable closing effect due to dimensional accuracy.

The present invention has been made to solve the above-mentioned problems, and the purpose of the present invention is to provide a socket structure in which a socket is formed at the end of a pipe with a wall through-hole. To provide a socket structure for a plastic tube in which a socket is formed without heat molding, and a wall hole is simultaneously and reliably closed by forming the socket.

As a means for achieving the object, the present invention provides a straight wall-through-hole pipe 1 as a plastic pipe in which a large number of wall holes 1a are formed in the pipe wall along the pipe axis direction, and A socket tube 2 consisting of a single plastic molded cylinder externally fitted and fixed on the tube end of the through-hole tube 1
The end face of the pipe wall through-hole pipe 1 is formed into a slope 1b whose inner periphery protrudes outward, and the socket pipe 2 is formed of a body part 4 in the middle of the pipe body. The inner diameter is formed to be equal to the inner diameter of the wall-through-hole pipe 1, and the inner diameter of the fixed side cylindrical portion 3 on one side from the body 4 is formed to a diameter that fits externally into the wall-through-hole pipe 1. At the same time, a stepped slope 3a is formed between the body 4 and the fixed side cylinder part 3, which is closely fixed to the slope 1b of the end surface of the tube wall through-hole tube 1, and the body 4 of the socket tube 2 is
The inner diameter of the socket-side cylindrical portion 5 on the other side is formed to the diameter of the socket into which the pipe end 7 of the other plastic pipe is inserted and joined.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

As shown in the accompanying drawings, the socket structure of the embodiment is formed at one end of the wall-through-hole pipe 1 as a plastic pipe, that is, the outer periphery of the pipe end where the pipe wall is cut off diagonally. On the surface, the fixed side cylinder part 3 of the socket cylinder 2, which is formed separately from the same material as the pipe 1, is fitted and adhered, and there is a cut-off slope of the pipe wall where the wall hole 1a opens. 1b is closely adhered to the stepped slope 3a of the inner circumferential surface of the cylindrical portion 3.

Therefore, the shape of the socket tube 2 is such that a body section 4 is formed in the middle of the tube body, and then from the body section 4 there is a fixed side tube section 3 on the right side of the drawing, and from the body section 4 there is a receiving section on the left side of the drawing. The mouth side cylinder portion 5 is formed into an enlarged diameter step, and further,
A ring bulging portion 5a is formed in the middle of the socket side cylindrical portion 5.

Therefore, the inner diameter of the body part 4 is molded to be equal to the inner diameter of the pipe 1, and the inner diameter of the socket side cylinder part 5 is molded to be slightly larger than the inner diameter of the pipe 1. A rubber ring 6 is attached to the inner wall of the portion 5a.
The inner filling groove 5b is recessed.

In manufacturing the wall-through-hole tube 1, one of the following methods may be used to adhere the socket tube 2 to the outer circumferential surface of the end of the tube 1.

(a) Frictional heating welding method With the fixing side cylindrical portion 3 fitted onto the tube end, the two are rotated relative to each other at high speed, and the frictional heat generated at that time thermally welds the joint surfaces.

(b) Heat-shrink bonding method (Part 1) With the fixed side cylinder part 3 given heat-shrinkable properties fitted onto the tube end, the outer wall of the cylinder part 3 is heated from the outside, and the above-mentioned cylinder at that time The bonding surfaces are bonded by shrinkage of the portion 3.

(c) Heat-shrink adhesive method (Part 2) Same as the previous item (b), except that hot melt adhesive is applied to the joint surface before heating.

(d) Adhesive bonding method A common solution adhesive is applied to the joining surface in advance, and then the fixed side cylinder part 3 is press-fitted into the tube end.

The other plastic pipe adjacent to the socket structure of the embodiment configured in this way (a normal plastic pipe without a pipe wall through-hole, but a pipe with a wall through-hole is also possible)
To connect the cut-off end 7 of the tube, first load the rubber ring 6 into the inner filling groove 5b, then insert the end 7 of the tube into the rubber ring 6, and It is inserted into the inner hole, but with the above structure, heat molding is not performed when forming the socket, so there is no thinning of the wall during molding, and there is no distortion or waves on the inner and outer circumferential surfaces of the pipe wall at the socket. No punch-shaped deformation occurs, and therefore the strength of the socket part is maintained sufficiently strong, which prevents the risk of cracking or damage to the socket part when the tube wall through-hole pipe 1 is stored or piped. There is no leakage, and the sealing performance with the rubber ring is also good.

Also, when gluing the socket part, at the same time, the wall hole 1a
Since it is reliably closed by the stepped slope 3a of the fixed side cylinder part 3, there is no need to separately process a closing means, and therefore, the process of the socket part is simple and easy.

In the configuration of the above embodiment, the ring bulge 5a is formed in the middle of the socket side cylinder part 5 of the socket cylinder 2, but if there is no need to load a rubber ring, the cylinder part 5 can be removed. Create a flat structure.

As described above, according to the present invention, one socket tube 2 formed separately is externally fitted and fixed to the tube end of the tube wall through-hole tube 1, and the end surface of the tube wall through-hole tube 1 is fixed. is formed into a slope 1b whose inner periphery protrudes outward, and a stepped slope 3a is formed on the inner peripheral wall of the socket tube 2, which is closely fixed to the slope 1b. 1 is not heated and molded, no distortion or wavy deformation occurs on the inner and outer circumferential surfaces of the pipe wall of the socket, and its strength is maintained sufficiently. When attaching the socket tube 2 to the end,
The tapered surfaces of the slope 1b and the stepped slope 3a act as guides and naturally come into close contact with each other, and the area of this contact surface also increases along the slope, so that the wall hole 1a can be closed without using any other closing member. This has the advantage that the process can be easily and reliably performed simultaneously with the formation of the socket.

[Brief explanation of the drawing]

The attached figure is a sectional view of a plastic tube socket structure showing an embodiment of the present invention. 1...Pipe wall through-hole pipe as a plastic pipe, 2
...Socket tube, 3...Fixed side cylinder part, 4...Body part, 5
... Socket side cylinder part.

Claims (1)

[Claims for Utility Model Registration] A straight wall-through-hole pipe 1 as one plastic pipe in which a large number of wall holes 1a are formed in the pipe wall along the pipe axis direction, and the wall-through-hole pipe 1 a socket tube 2 made of a plastic molded cylinder externally fitted and fixed on the tube end of the tube; The socket tube 2 is formed so that the inner diameter of the body section 4 in the middle of the tube body is equal to the inner diameter size of the tube wall through-hole tube 1, and from the body section 4 on one side. The inner diameter of the fixed side cylindrical part 3 is formed to a diameter that circumscribes the wall-through-hole pipe 1, and the space between the body part 4 and the fixed-side cylindrical part 3 is the slope of the end surface of the wall-through-hole pipe 1. The pipe end 7 of the other plastic pipe is inserted into the inner diameter of the socket side cylinder part 5 on the other side from the body part 4 of the socket pipe 2. A plastic pipe socket structure characterized by being molded to the diameter of the socket.