KR20030007017A - Coupling packing and pipe connecting structure using the same - Google Patents

Abstract

An object of this invention is to provide the connection structure of the pipe which can fully counteract a pull-out force, ensuring high watertightness.

A cylindrical joint packing 6 is interposed between the tube joint 1 and the end of the straight tube 4 inserted into the tube section 3 of the tube joint 1. The joint packing 6 has a leading end portion positioned on the insertion end face 7 side of the straight pipe 4 as the water soft portion 10, and a restraining member having the remaining rear end portion attached to the pipe joint 1 In accordance with (19), it is set as the hard part 11 for fall prevention which prevents the packing 6 from falling out from the pipe joint 1.

Description

Joint packing and pipe connection structure using this {COUPLING PACKING AND PIPE CONNECTING STRUCTURE USING THE SAME}

The present invention relates to a joint packing used for a joint of a tube and a joint structure of a tube using the joint packing.

Conventionally, in connection of a pipe joint such as a joint for connecting heterogeneous pipes and a straight pipe, after inserting the ends of the straight pipes into the ends of the pipe joints, various kinds of water-reducing tapes are recommended to prevent gaps between these ends. Was drunk. By the way, since the winding of the index tape had to be done by hand, it required a lot of labor and time. In addition, it was difficult to secure stable watertightness.

Therefore, in recent years, instead of winding up the water-inducing tape, a packing is interposed between the pipe joint and the end of the straight pipe, whereby the connection work can be easily performed in a short time, and stable watertightness can be ensured. .

However, as this kind of packing, soft rubber is often used in close contact with a pipe joint or a straight pipe to ensure high watertightness. Therefore, when a force in the drawing direction is applied to the straight pipe due to an earthquake or the like, There was a problem that the packing is easily deformed and the straight pipe or the packing is pulled out from the end of the pipe joint. Nevertheless, when a hard rubber packing which is not easily elastically deformed is used to counteract this pulling force, this has caused a problem that it is difficult to secure high watertightness because it is not in close contact with a pipe joint or a straight pipe at this time.

Therefore, an object of the present invention is to provide a joint packing and a connection structure of a pipe using the same, which can solve the above problems and secure high watertightness, and can also sufficiently against the pulling force.

1 is a longitudinal cross-sectional view of a connection structure of a pipe according to an embodiment of the present invention.

2 is an enlarged view of the same main part thereof.

3 is a perspective view of a joint packing;

<Description of the symbols for the main parts of the drawings>

1: pipe joint (one pipe)

4: other pipe (straight pipe)

6: joint packing

7: insertion end face

10: soft part

11: hard part

12, 13: projection

17: step

19: fall prevention member

In order to solve the above problems, the joint packing of the present invention is a cylindrical joint packing interposed between an end of one tube and an end of the other tube inserted into the end of the one tube, and an insertion end surface of the other tube. One of the front end or the other rear end located on the side was used as a soft part for water exploration, and the other end of the front end or the rear end was engaged with one observation to form a hardened-out prevention part that prevents the packing from falling off from one end of the tube. It features.

Moreover, the cylindrical joint packing interposed between the end part of one pipe | tube and the end part of the other pipe | tube inserted in the end part of this one pipe | tube, The tip part located in the insertion end surface side of the other pipe | tube shall be made into a soft part for water supply. And the remaining rear end is fitted to one side observation so as to be a hard part for prevention of slipping which prevents the packing from coming off from the end of one tube.

Then, one or a plurality of protrusions are formed on the inner and outer circumferential surfaces of the soft portion along the circumferential direction. Moreover, the outer peripheral surface of a hard part is formed in the step which contacts the fall prevention member attached to the edge part of one pipe | tube, and stops the movement to the direction which a packing falls out.

The connection structure of the pipe | tube of this invention is made through the cylindrical joint packing between the edge part of one pipe | tube, and the end part of the other pipe | tube inserted in the edge part of this pipe | tube, and a joint packing is carried out of the other pipe | tube. One of the leading end or the remaining rear end positioned on the insertion end face side is a soft part for water exploration, and the other end of the leading end or the rear end is fitted with one observation to prevent the falling out of the end of one tube to the hard part for preventing falling out. It is characterized by doing.

And the hard part of the joint packing is bonded to the inner peripheral surface of one pipe | tube, or the outer peripheral surface of the other pipe | tube. In addition, one pipe is made of a pipe joint, and the other pipe is made of a straight pipe.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of this invention is described in detail based on drawing. BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view of the connection structure of the pipe which concerns on one Embodiment of this invention, FIG. 2 is the main part enlarged view, FIG. 3 is a perspective view of the joint packing.

In the drawings, reference numeral 1 denotes a pipe joint for connecting heterogeneous pipes, for example, made of synthetic resin as one pipe of the present invention. In the pipe joint 1, annular projections 2 are formed in the center of the inner circumferential surface thereof, and tubular portions 3 and 3 are formed at both ends of the pipe joint 1 with the annular projections 2 interposed therebetween. have. These tubular parts 3 and 3 have a shape in which the diameter is expanded in three steps as they move away from the annular projection 2.

Then, the end portion of, for example, a forced straight tube 4 as the other pipe of the present invention is inserted into the tubular portion 3 on one end side of the pipe joint 1, and the synthetic resin is inserted into the tubular portion 3 on the other end side. The ends of the helical corrugated pipe 5 are inserted so that they communicate with each other.

Reference numeral 6 denotes a substantially cylindrical joint packing interposed between the tubular portion 3 on the one end side of the tube joint 1 and the straight tube 4. As shown in Figs. 2 and 3, the joint packing 6 has a tip portion located at the insertion end face 7 side of the straight pipe 4 as the soft portion 10 for indexing. The rear end portion is a hard portion 11 for preventing falling out.

In the manufacture of the packing 6, the soft part 10 and the hard part 11 are integrally formed by vulcanizing a soft rubber having a hardness of about 40 degrees and a hard rubber having a hardness of about 90 degrees, for example. . The rubber material used for the soft portion 10 and the hard portion 11 may be a natural rubber or a synthetic rubber, as long as rubbers of the same kind are chemically similar rubbers and are bonded to each other by being co-vulcanized and integrated together. In addition, as chemically similar synthetic resins, which are mutually compatible with and integrated with each other, the soft portion 10 uses a soft synthetic resin having good sealing properties such that compression deformation is possible and water does not leak. Hard synthetic resin may be used as the resin. In addition, as hardness of the soft part 10 and the hard part 11, it is not limited to the above, It can set arbitrarily.

On the outer circumferential surface of the soft portion 10, a plurality of cross-sectional semicircular projections 12 and 12 are formed along the circumferential direction thereof. And these protrusions 12 and 12 pressurize watertightness by pressure-contacting the inner peripheral surface of the small diameter part 15 in the cylindrical part 3 of the pipe joint 1. Further, a plurality of fin-shaped protrusions 13 and 13 are formed on the inner circumferential surface of the soft portion 10 along the circumferential direction thereof. And these protrusions 13 and 13 are contacting the outer peripheral surface of the straight pipe 4, and watertightness is improved.

Moreover, in this embodiment, although the protrusions 12 and 13 are formed in equal intervals by four on the inner and outer peripheral surfaces of the soft part 10, it is not limited to this, The number and space | interval are changed suitably, Also good. In addition, the cross-sections of the projections 12 and 13 may be formed in a substantially triangular shape so as to sharpen the tip portion pressed against the pipe joint 1, in which case the watertightness can be further improved.

The hard part 11 is adhere | attached with the outer peripheral surface of the middle diameter part 16 and the straight pipe 4 in the cylindrical part 3 of the pipe joint 1 with an adhesive agent. Accordingly, the tensile strength can be increased, and even when a force in the drawing direction is applied to the straight pipe 4, the straight pipe 4 and the packing 6 are not easily drawn out from the tubular portion 3 of the pipe joint 1. It is supposed to be.

Moreover, the step 17 is formed in the outer peripheral surface of the hard part 11 along the circumferential direction by making the rear end side low with respect to the front end side. The step 17 is formed in correspondence with the boundary portion between the middle diameter portion 16 and the large diameter portion 18 of the tubular portion 3, whereby the tip side is larger than the step 17 of the hard portion 11. It is sandwiched between the middle diameter part 16 and the straight pipe 4, and is formed between the large diameter part 18 and the straight pipe 4 in a state where a rear end side is formed between the large diameter parts 18 rather than the step 17. Is placed on. And the substantially cylindrical fall prevention member 19 is screwed together to the large diameter part 18 so that it may fit in this clearance gap, and the front-end | tip part of this fall prevention member 19 becomes the step | step of the hard part 11 ( By contacting 17), movement in the direction in which the packing 6 falls out is prevented.

Thus, even if the force of the drawing direction acts on the straight pipe 4 by engaging the hard part 11 of the packing 6 with the fall prevention member 19 by the side of the pipe joint 1, It is not easy to deform | transform, and the drawing of the straight pipe 4 and the packing 6 from the cylindrical part 3 is prevented reliably.

Reference numeral 20 denotes a soft rubber packing interposed between the small diameter portion 15 and the spiral corrugated pipe 5 in the cylindrical portion 3 on the other end side of the pipe joint 1. The packing 20 is formed in a short cylindrical shape, and on the inner circumferential surface thereof is formed an exponential protruding line 22 which is screwed to the spiral groove 21 of the spiral corrugated pipe 5.

Reference numeral 25 denotes a fitting member made of a substantially cylindrical synthetic resin fitted outside the spiral corrugated pipe 5. On the inner circumferential surface of the fitting member 25, a locking projection line 26 is screwed to the spiral groove 21 of the spiral corrugated pipe 5, and a step 27 is formed on the outer circumferential surface along the circumferential direction. Formed. Then, the substantially cylindrical release preventing member 19 is screwed to the large-diameter portion 18 in the tubular portion 3 on the other end side, and the end portion of the release preventing member 19 is fitted to the fitting member 25. Pulling out of the fitting member 25 and the spiral corrugated pipe 5 from the cylindrical part 3 is prevented by making it contact with the step | step 27 of ().

In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added to the said embodiment within the scope of the present invention. For example, one pipe is not limited to a pipe joint, and may be a general straight pipe, a corrugated pipe, or the like. The other tube is not limited to the straight tube but may be a pipe joint or a corrugated tube. In the joint packing, the leading end portion located on the insertion end face side of the other pipe may be a hardened portion for preventing slipping, and the remaining rear end may be a soft portion for indexing.

As is clear from the above description, when the pipes are connected using the joint packing of the present invention, the high watertightness can be ensured by the soft part having excellent adhesion, and the hard part with few deformations is fitted to one side observation. Even if a force in the drawing direction acts on the other pipe due to, for example, it is possible to sufficiently resist the pulling force and to reliably prevent the packing or the other pipe from coming off from one pipe.

Further, since annular protrusions are formed on the inner and outer circumferential surfaces of the soft portion of the joint packing, the watertightness can be further improved by press-contacting these protrusions with the inner circumferential surface of one tube or the outer circumferential surface of the other tube.

In addition, since the prevention of movement in the direction in which the packing is taken out is prevented by contacting the step preventing member of one observation with the step formed on the outer circumferential surface of the hard part of the joint packing, the shape of the packing can be made simple and the manufacturing cost can be reduced. Can be planned.

In addition, by attaching the hard part of the joint packing to one pipe or the other pipe, it is possible to obtain a highly reliable connection structure in which the tensile strength is increased and is not easily drawn out.

Claims (8)

A cylindrical joint packing interposed between an end portion of one tube and an end portion of the other tube inserted into the end portion of the one tube, wherein one of the front end portion or the other rear end portion located on the insertion end surface side of the other tube is indexed. A joint packing comprising: a soft part for preventing falling, wherein the other end of the tip or the rear end is fitted to one observation to prevent the packing from falling off from the end of one tube. The joint packing according to claim 1, wherein one or more projections are formed on the inner and outer circumferential surfaces of the soft portion along the circumferential direction. A cylindrical joint packing interposed between an end portion of one tube and an end portion of the other tube inserted into the end portion of the one tube, wherein the tip portion located on the insertion end surface side of the other tube is a water soft portion. A seam packing, wherein a rear end portion is fitted to one side observation to form a hardening portion for preventing the dropping of the packing from the end of one tube. The joint packing according to claim 3, wherein one or more protrusions are formed on the inner and outer circumferential surfaces of the soft portion along the circumferential direction. The joint packing according to any one of claims 1 to 4, wherein the outer circumferential surface of the hard portion is provided with a step for contacting a release preventing member attached to an end of one tube to prevent a movement in the direction in which the packing is pulled out. In the connection structure between the end part of one pipe | tube and the end part of the other pipe | tube inserted in the end part of this pipe | tube, the joint packing is located in the insertion end surface side of the other pipe | tube. One of the front end portion or the other rear end portion is a soft part for water exponent, and the other end portion of the end portion or the rear end portion is fitted with one observation, and the pipe is characterized in that it is formed as a hardening portion for preventing falling off from the end of one tube. Connection structure. The pipe connecting structure according to claim 6, wherein the hard part of the joint packing is bonded to the inner circumferential surface of one tube or the outer circumferential surface of the other tube. The pipe connecting structure according to claim 6 or 7, wherein one pipe is made of a pipe joint and the other pipe is a straight pipe.