JPH0758115B2 - Pipe joint structure - Google Patents

Description

The present invention relates to the structure of a pipe joint, and more particularly to the structure of a pipe joint having a pipe separation prevention function.

[Conventional technology]

Conventionally, when laying a plastic pipe line, it is well known that a pipe joint including a combination of an insertion port and a receiving port is used for connecting pipes.

Since this pipe joint allows bending and axial movement to some extent, it has the advantage of being highly elastic because it can be bent and axially moved due to fluctuations in the buried ground or internal forces such as internal pressure.

However, if the axial movement exceeds a certain limit, the pipe joint part is disengaged, so it is necessary to prevent the axial movement.
As disclosed in JP-A-55-26125 and JP-A-60-126783, locking fittings are attached to both the insertion port and the receiving tube of the pipe connecting portion, and an arm is installed between the locking fittings so that both arms can be installed. It has been proposed to prevent separation by regulating the interval.

However, since each of the above-mentioned pipe detachment prevention tools is composed of two cracking metal fittings, the installation work is troublesome, and the fasteners or rods of these two cracking metal fittings are projected to the outer surface of the pipe fitting, so that the pipe fitting part There was a drawback that the piping space of became large.

In view of these problems, a groove is formed on the inner surface of the receiving opening, the bottom of which becomes shallower toward the opening direction. The groove is formed on the inner surface of the opening of the receiving opening, the C-shaped ring is inserted into the groove, and then the insertion opening is inserted. Pipe fittings have been proposed which prevent the escape of the insertion opening due to the wedge effect produced by the C-shaped ring that moves with the mouth (for example, JP-A-63-64993, JP-A-4-18787, or JP-A-4-39).
No. 488).

By the above-mentioned improvement measure, the use of the pipe detachment preventive tool which largely protrudes to the outer circumference of the pipe can be omitted, and the piping space can be omitted and the mounting can be easily performed.

[Problems of conventional technology]

However, in the above improvement, it is necessary to form a groove having a shallow bottom surface toward the opening in the receiving port, and it is necessary to use a special mold in the case of injection molding to form the groove having such a delicate shape. In addition, it is more difficult to form such a groove by secondary molding of the plastic pipe, and there is a problem that the manufacturing is not easy. In addition, there is a problem in that the above-mentioned improvement measure cannot be implemented in a general pipe joint without such a special groove, and the versatility is lacking. In addition, C to prevent slipping out
Since the groove into which the mold ring is inserted is provided at a position axially separated from the sealing rubber ring, when the insertion port is inclined with respect to the receiving port due to this axial tube distance, the sealing rubber ring serves as a fulcrum. There is also a drawback that the flexibility of the pipe is limited and the force acting on the C-shaped ring portion becomes large when a bending force is applied.

[Problems to be Solved by the Invention]

In view of the above problems, the present invention has been made for the purpose of generalizing a pipe joint which is space-saving, has a very simple installation work, and has improved flexibility.

[Technology that has solved the problem]

That is, the structure of the pipe joint of the present invention is such that the sealing rubber ring is mounted in the receiving port having the sealing rubber ring mounting groove on the inner surface thereof, and then the insertion port is inserted, and the inner surface of the receiving port and the outer surface of the insertion port are inserted. In a pipe joint that presses the rubber ring into the annular space for sealing, a hard annular body is integrally engaged with the mouth opening end side of the rubber ring, and the hard annular inner surface has an axial cross section. A circumferential groove is formed in which the bottom surface of the taper becomes shallower toward the receiving opening end side, and the inner circumferential surface has a non-slip surface capable of contacting the insertion opening, and the outer circumferential surface Is a C-shaped ring inserted as a sliding surface capable of contacting the bottom surface of the circumferential groove.

〔Example〕

 Next, an embodiment of the present invention will be described.

FIG. 1 is an enlarged sectional view of an essential part of an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is an exploded perspective view of an essential part of the embodiment.

The structure of the pipe joint of the present invention is such that the sealing rubber ring 2 is mounted in the receiving port 1 having the sealing rubber ring mounting groove 1B on the inner surface 1A, and then the insertion port 3 is inserted to insert into the receiving port 1 inner surface. In a pipe joint in which the rubber ring 2 is press-fitted into the annular space between the outer surface of the mouth 3 and the seal, a hard annular body 4 is attached to the receiving opening end side 2A of the rubber ring 2 via locking pieces 4B ... 4B. Rigid ring 4 that is integrally engaged
A circumferential groove 5 is formed on the inner surface such that the bottom surface 5A in the axial cross section becomes shallower in taper shape toward the mouth opening end side. Inside the circumferential groove 5, the inner circumferential surface contacts the outer surface of the insertion slot 3. A C-shaped ring 6 having a possible slip preventing surface 6A and an outer peripheral surface serving as a sliding surface 6B capable of contacting the bottom surface 5A of the circumferential groove 5 is inserted.

In the above-described embodiment, the hard annular body 4 is made of a synthetic resin such as PVC, or is made of metal, shape memory synthetic resin, shape memory alloy, or the like.

Further, the shape of the annular body 4 is such that the outer surfaces 4A ... 4A along the inner surface of the rubber ring mounting groove 1B formed on the inner surface of the receiving port 1 and the inner surface of the rubber ring 2 are engaged with each other as shown in FIGS. The stopper 4B is formed in combination with the stoppers 4B ... 4B so that the rubber ring 2 does not separate from the receiving opening 1 when the insertion opening is inserted.

In addition to the above, the annular body 4 has a structure in which a cut 4C is formed as shown in FIG. 4 and is supported by a belt-shaped reinforcing member 4D which is bendable and has tensile strength, and further as shown in FIG. A notch 4C 'that can be connected in the circumferential direction is formed on this notch 4C'
It may be configured to be connected in a loop with.

[Action]

To implement the structure of the pipe joint of the present invention, first, the rubber ring 2 is mounted in the receiving port 1, and then the hard annular body 4 is attached to the rubber ring 2.
Is fitted into a predetermined engaging portion of.

At this time, when the hard annular body 4 is made of synthetic resin, it is softened by heating and deformed, and after being inserted into the rubber ring 2, the original shape is restored.

This work is easy when the hard annular body 4 is made of the shape memory resin or the same alloy, and becomes easier when the cuts 4C and 4C 'are provided.

Next, the C-shaped ring 6 is attached to the circumferential groove 5 on the inner surface of the hard annular body 4, and the insertion opening 3 is inserted into the receiving opening 1.

At this time, since the C-shaped ring 6 is located on the deeper side of the circumferential groove 5, the diameter of the C-shaped ring 6 is increased and attached to the outer periphery of the insertion opening when the insertion opening 3 is inserted, which does not cause any adverse effect on the joining.

After connecting the pipes, when an external force acts on the pipes in the direction of pulling out, the C-shaped ring 6 that moves together with the insertion port 3 has a bottom surface 5A of the circumferential groove 5.
As a result, a wedge effect is generated, and the insertion opening 3 is tightened in the radial direction, and at the same time, it is prevented from coming out in the axial direction by contact with the bottom surface of the circumferential groove 5.

Further, a force for expanding the annular body 4 acts due to the wedge effect, but the expansion of the annular body 4 is restricted because the outer periphery 4A of the annular body 4 and the inner surface of the rubber ring mounting groove 1B are in contact with each other. Further, since the hard annular body 4 is not integrally formed with the rubber ring 2 but is integrally combined, the axial distance between the seal portion of the rubber ring 2 and the slip-out preventing portion of the annular body 4 due to the circumferential groove 5 is prevented. Is small, and therefore the flexibility of the insertion opening with respect to the receiving opening is good.

〔effect〕

As described above, according to the present invention, the circumferential groove for preventing the tube from coming off in cooperation with the C-ring is not provided separately from the rubber ring mounting groove of the receiving port but is inserted into the receiving port. Since it is incorporated in the rubber ring portion, it can be easily implemented even in the conventional fitting port of a pipe joint, and pipe detachment can be effectively achieved in cooperation with the rubber ring. In addition, since the circumferential groove for preventing the pipe from coming off is integrally provided on the rubber ring, there is an effect that the flexibility of the receiving opening and the insertion opening is good.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part of an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is an exploded perspective view of an essential part of the embodiment, FIGS. The figure is a cross-sectional view of an essential part of another embodiment. 1 …… Receptacle, 1A …… Inner surface, 1B …… Rubber ring mounting groove, 2 ……
Rubber ring, 3 ... insertion slot, 4 ... hard annular body, 4A ... outer surface of hard annular body, 4B ... locking piece, 4C, 4C '... break, 4
D: Belt-shaped reinforcing material, 5 ... Circumferential groove, 6 ... C-shaped ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazutaka Takada 64, Ishizukita-machi, Sakai City, Osaka Kubota Vinyl Pipe Factory Co., Ltd. (56) References: 63-64993 (JP, U)

Claims (1)

[Claims] Claim: What is claimed is: 1. A rubber ring for sealing is mounted in a receiving opening having a rubber ring mounting groove for sealing, and the insertion opening is inserted, and the rubber is provided in an annular space between an inner surface of the receiving opening and an outer surface of the insertion opening. In a pipe joint in which a ring is press-fitted for sealing, a hard annular body is integrally engaged with a receiving opening end side of the rubber ring, and a bottom surface in an axial cross section is received on the hard annular inner surface. A circumferential groove is formed which becomes shallower in a tapered shape toward the opening end side, and the inner circumferential surface has a non-slip surface capable of contacting the insertion opening, and the outer circumferential surface has the circumferential groove. The structure of the pipe joint is characterized in that a C-shaped ring, which is a sliding surface that can come into contact with the bottom surface of the pipe, is inserted.