JPH11270686A - Elastic seal material for pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic seal material for pipe joint, which allows easy fitting of a spigot to a socket and excels in the water-tightness. SOLUTION: A pipe joint is structured so that the forefront 5a of a ring- shaped elastic seal material 5 is put in tight attachment to the outside surface of a spigot 2a formed at the end of one pipe 2 by inserting the spigot 2a into a socket 1a formed at the end of another pipe 1, wherein the thickness of the forefront 5a of the seal material 5 is some greater than the gap H between the socket 1a and spigot 2a, and the forefront part 5a is furnished with a water passing groove 14 as ranging from the water contacting surface 13 to the central part, and the seal 5 is furnished consolidatedly with a plurality of gap retaining projections 15 and 16 at a certain spacing which are protruding into the groove 14 to retain the gap of the groove 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic sealing material for a pipe joint used for a pipe joint in which an insertion hole is fitted into a socket in a slip-on manner.

[0002]

2. Description of the Related Art Conventionally, as an example of a separation preventing pipe joint, there is one described in Japanese Patent Application Laid-Open No. Hei 5-231572. As shown in FIG. 8, an opening-side annular groove 3 and a back-side annular groove 4 are formed on an inner peripheral surface of a receiving port 1a provided at an end of one of the tubular bodies 1, and the opening side is formed. A rubber annular elastic seal member 5 is fitted in the annular groove 3, and a lock ring 7 is fitted in the inner annular groove 4 via a rubber support ring 6. In addition, a stopper 8 is protrudingly provided at the end of the outer peripheral surface of the insertion port 2a provided at the end of the other tubular body 2.

[0003] In the above configuration, simply inserting the insertion port 2a into the reception port 1a causes the stopper 8 of the insertion port 2a to move into the reception port 1a.
a into the inner part of the insertion hole 2a and engaged with the lock ring 7 so that the receiving port 1a and the insertion port 2a are irremovably fitted together, and the distal end 5a of the elastic sealing material 5 is connected to the outer peripheral surface of the insertion port 2a. And watertightness is maintained.

[0004]

In the above-mentioned conventional configuration,
The thickness of the tip 5a of the elastic sealing material 5 is
It is durable and excellent in watertightness because it uses a Titon type that is set slightly larger than the distance H between the a and the insertion opening 2a. However, the surface pressure of rubber is high, and the creep phenomenon occurs in a polyolefin pipe. As a result, the inner core is required because the diameter is reduced and watertightness is impaired. Further, when the stopper 8 of the insertion opening 2a is forcibly inserted beyond the elastic sealing material 5, an excessive resistance is received, and the insertion work is troublesome and troublesome, resulting in poor workability.

Therefore, as shown in FIG. 9, it is conceivable to use a lip type in which the thickness of the tip portion 5a is small and the resistance at the time of insertion is reduced as the elastic sealing material 5; The tip 5a of the sealing material 5 is easily damaged, and the damage deteriorates water tightness.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an elastic sealing material for a pipe joint which is easy to fit between a receiving port and an insertion port and has excellent watertightness.

[0007]

In order to achieve the above-mentioned object, the present invention provides a method in which an insertion port provided at an end of another tube is inserted into a receptacle provided at an end of one tube. In a pipe joint in which the distal end portion of an annular elastic seal material provided on the inner peripheral surface of the receiving port is in close contact with the outer peripheral surface of the insertion opening, A water passage groove is formed over the portion, and a plurality of gap holding projections projecting into the water passage groove and holding a gap between the water passage grooves are formed integrally with the elastic sealing material at predetermined intervals. And

According to the above construction, the distal end of the elastic sealing material is bifurcated into an inner peripheral portion and an outer peripheral portion by the water passage groove, and the inner peripheral portion is formed in a lip type. The insertion opening can be easily inserted into the reception opening beyond the elastic sealing material. Further, since the inner peripheral portion and the outer peripheral portion are integrated via a plurality of gap holding projections for holding the gap of the water passage groove, and the tip end portion of the elastic sealing material is formed in a Titon type shape. In addition to being durable, the inner peripheral portion is pressed against the outer peripheral surface of the insertion opening by the water pressure applied to the water passage groove, so that the watertightness is excellent.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a separation-preventing pipe joint provided with a pipe joint elastic seal member 5 according to a first embodiment of the present invention, in which both pipe bodies 1 and 2 are formed of a synthetic resin material such as polyolefin. As well as the stopper 8
Are formed integrally with the insertion opening 2a. In addition, 11 is the insertion opening 2
a is a metal inner core for reinforcement fitted to the inner peripheral surface of a. Structures other than the above are substantially the same as those of the conventional example shown in FIG. 8, and therefore, the same parts are denoted by the same reference numerals and description thereof will be omitted.

As shown in FIGS. 2 to 5, the elastic sealing material 5 has a tip 5a whose thickness is set to be slightly larger than or equal to the distance H between the receiving port 1a and the insertion port 2a. It is formed in a Titon type shape and its water contact surface 13
An annular water passage groove 14 is formed from the water passage groove 14 to a central portion thereof. A plurality of gap holding projections 15 extending in the circumferential direction are provided at predetermined intervals on the inner peripheral side surface of the water passage groove 14. A number of gap holding projections 1 extending in the axial direction
6 are protruded at predetermined intervals, and the ends of the gap holding projections 15 and 16 are elastically abutted in an intersecting manner (see the imaginary line in FIG. 5), thereby forming the gap of the water passage groove 14. α is held. In FIG. 2, reference numeral 17 denotes an elastic sealing material 5.
And a projection for cleaning and preventing foreign matter from entering, which protrudes from the opening on the inner peripheral surface side and has an end abutting on the outer peripheral surface of the insertion opening 2a.

According to the above construction, the distal end portion 5a of the elastic sealing material 5 is divided into the inner peripheral portion 5A and the outer peripheral portion 5B by the water passage groove 14 in a bifurcated manner. Therefore, the insertion opening 2a can be easily inserted into the receiving opening 1a beyond the elastic sealing material 5. Further, the inner peripheral portion 5A and the outer peripheral portion 5B are integrated via a plurality of gap holding projections 15 and 16 for holding the gap α of the water passage groove 14, so that the tip 5a of the elastic sealing material 5 is Since it is formed in a shape, it is strong, and the inner peripheral portion 5A is inserted into the insertion opening 2a by the water pressure a applied to the water passage groove 14.
Because it is pressed against the outer peripheral surface of the, it is excellent in water tightness.

In the first embodiment, the gap holding projections 15 and 16 are provided on both the inner and outer side surfaces of the water passage groove 14, but the invention is not limited to this. As shown in FIG. Only the gap holding projections 16 protruding from the outer peripheral side surface of the water groove 14 may be left, and the inner peripheral side surface of the water passage groove 14 may be a smooth surface 18,
Conversely, a large number of gap holding projections 16 extending in the axial direction are provided on the inner peripheral side surface of the water passage groove 14 to project therefrom.
The outer peripheral side surface of 4 may be a smooth surface 18 (second embodiment).

In the first and second embodiments, the gap holding projections 15 and 16 are formed in a band shape. However, the present invention is not limited to this. As shown in FIG. , 16 are rectangular in cross section (or circular in cross section)
(Third embodiment).

[0014]

According to the present invention, the distal end of the elastic sealing material is divided into an inner peripheral portion and an outer peripheral portion in a bifurcated manner by a water passage groove, and the inner peripheral portion is formed in a lip type. Therefore, even if the pipe is made of a polyolefin-based material, an inner core is not required at the sealing portion, and the insertion port can be easily inserted into the receiving port beyond the elastic sealing material. Further, since the inner peripheral portion and the outer peripheral portion are integrated via a plurality of gap holding projections for holding the gap of the water passage groove, and the tip end portion of the elastic sealing material is formed in a Titon type shape. In addition to being durable, the inner peripheral portion is pressed against the outer peripheral surface of the insertion opening by the water pressure applied to the water passage groove, so that the watertightness is excellent.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a separation preventing pipe joint provided with a pipe joint elastic seal material according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the main part.

FIG. 3 is a view taken along the line AA in FIG. 2;

FIG. 4 is a view taken in the direction of arrows BB in FIG. 2;

FIG. 5 is an enlarged perspective view of the main part.

FIG. 6 is an enlarged perspective view of a main part of an elastic sealing material for a pipe joint according to a second embodiment of the present invention.

FIG. 7 is a horizontal sectional view of a main part of an elastic sealing material for a pipe joint according to a third embodiment of the present invention.

FIG. 8 is a longitudinal sectional view showing an example of the related art.

FIG. 9 is a longitudinal sectional view showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 One pipe 1a Reception port 2 The other pipe 2a Insertion port 5 Elastic sealing material 5a Tip of elastic sealing material 13 Water contact surface 14 Water passage groove 15 Gap holding projection 16 Gap holding projection H Interval between

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiki Yamada 64 Ishizukita-cho, Sakai-shi, Osaka Inside Kubota Vinyl Pipe Factory

Claims (1)

[Claims] 1. An annular elastic sealing material provided on the inner peripheral surface of the receiving port by inserting a receiving port provided at an end of the other pipe into a receiving port provided at an end of the other pipe. In the pipe joint in which the front end of the elastic seal member is in close contact with the outer peripheral surface of the insertion opening, a water passage groove is formed from the water contact surface to the center of the elastic seal material. An elastic sealing material for a pipe joint, wherein a plurality of gap holding projections protruding and holding the gap of the water passage groove are formed integrally with the elastic sealing material at predetermined intervals.