JP2547237B2 - Pipe fitting - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pipe joint used for piping such as a water pipe and a gas pipe.

(Prior art) Recently, as a pipe joint used for piping such as water pipes,
Plug-in type pipe joints have been developed which can fix the connecting pipe by simply inserting the pipe to be connected. In such a plug-in type pipe joint, it is necessary that the end of the connecting pipe can be easily inserted and the end of the inserted connecting pipe cannot be easily pulled out. For this reason, plug-in type pipe joints are usually disclosed in Japanese Utility Model Publication No. 51-72814 and Japanese Utility Model Publication No. 51-15212.
As disclosed in Japanese Patent No. 0, etc., a split ring for fixing the connecting pipe is provided in the tubular joint body. The split ring is divided in part in the circumferential direction, and the diameter can be reduced and the diameter can be increased. The split ring has a diameter slightly smaller than that of the connecting pipe when it is not fitted over the end portion of the connecting pipe, and when the connecting pipe is inserted into the joint main body, the connecting pipe is inside the split ring. Inserted in. The split ring expands in diameter when the connecting pipe is inserted and is fitted onto the outer peripheral surface of the connecting pipe. When the connecting pipe is about to come out of the joint body, the split ring is brought into contact with the tapered portion on the inner peripheral surface of the joint body to be reduced in diameter and locked to the connecting pipe.

(Problems to be Solved by the Invention) In the conventional pipe joint, when the split ring comes into contact with the tapered portion of the inner peripheral surface of the joint body to reduce the diameter, the facing surfaces of the split portion of the split ring come into contact with each other. For this reason, unless the gap between the facing surfaces of the split portions of the split ring is increased, the locking force between the split ring and the outer peripheral surface of the connecting pipe is insufficient, and the connecting pipe may come off from the split ring. For this reason, the gap between the facing surfaces of the split ring is relatively large, but if the gap is too large,
The split ring is strongly locked to the connecting pipe, which may damage the connecting pipe. In particular, in the divided portion of the split ring, since the corners are formed on the opposing surfaces, it is highly likely that each corner deeply digs into the outer peripheral surface of the connecting pipe and damages the connecting pipe.

For this reason, each facing surface of the split ring is made to have a tapered shape that is inclined with respect to the axial direction of the connecting pipe inserted into the split ring, and when the split ring is reduced in diameter, each facing surface is It is also conceivable to have a structure in which they abut and slide. However, in this case, if a force continues to act in the direction in which the connecting pipe comes off the joint body, the opposing surfaces will continue to slide and excessive force will be applied to the outer peripheral surface of the connecting pipe, causing damage to the connecting pipe. May occur.

The present invention solves the above-mentioned conventional problems, and an object thereof is to be able to insert a connecting pipe into a retaining ring arranged in a joint body with a relatively small force, and Another object of the present invention is to provide a pipe joint which has a great effect of preventing the disconnection, and in which the connection pipe is not damaged by the retaining ring.

(Means for Solving the Problem) The pipe joint of the present invention has a tubular shape into which the end portion of the connecting pipe from the opening portion at one end is inserted, and the inner peripheral portion thereof is provided with the opening portion side. The joint main body provided with a concave groove having a taper portion whose diameter is gradually reduced, and the joint main body which is disposed in the concave groove of the joint main body and has a facing surface parallel to each other. A retaining ring capable of being externally fitted to a connecting pipe inserted into the joint body, the opposing faces of the retaining ring contacting each other. It is slanted with respect to the axial direction of the connecting pipe inserted into the retaining ring so that it can slide when coming into contact with it, and a protrusion is provided on one of the facing surfaces and the other facing surface. Is provided with a recess into which the protrusion can be fitted, which is separated from the opposing position of the protrusion by a predetermined length in the sliding direction of the facing surface having the protrusion. Therefore, the above-mentioned purpose is achieved.

(Example) Hereinafter, the present invention will be described with reference to Examples.

As shown in FIG. 1, the pipe joint of the present invention includes a tubular joint body 10 that is externally fitted to an end portion of a connecting pipe 40, a sealing material 20 disposed in the joint body 10, A retaining ring (31) disposed inside the joint body (10).

The joint body 10 in the pipe joint 1 of the present invention has one end
An opening 11 into which the connecting pipe 40 is inserted is provided, and an annular groove 12 for a sealing material is provided on the inner peripheral surface in the vicinity of the opening 11. The groove 12 for the sealing material has a structure in which the opening 11 side is deep and the inner back side is shallow. For example, a rubber sealing material 20 is fitted and fixed in the floor sealing material groove 12. There is. The sealing material 20 is in close contact with the outer peripheral surface of the end portion of the connecting pipe 40 inserted into the joint body 10 and liquid-tightly seals the outer peripheral surface of the connecting pipe 40 and the inner peripheral surface of the joint body 10.

A recess 13 for a retaining ring is provided on the inner peripheral surface of the joint body 10 on the inner side in the axial direction with respect to the groove 12 for seal material. A retaining ring 31 is fitted in the retaining ring concave groove 13.

The retaining ring 31 is formed in an annular shape, for example, made of steel or the like and is divided in part in the circumferential direction, and opposing surfaces 31c and 31d parallel to each other are formed in the divided portion. The retaining ring 31 has a substantially circular cross section and has a diameter slightly smaller than the outer diameter of the connecting pipe 40 inserted into the joint body 10. The connecting pipe 40 is inserted into the retaining ring 31. Then, the retaining ring 31 expands in diameter and is brought into close contact with the outer peripheral surface of the connecting pipe 40.

A locking portion 31a, which is notched in a stepwise manner, is formed over the entire circumference at an inner peripheral side portion on the inner back side of the joint body 10 in the retaining ring 31. The locking portion 31a is cut out so as to have, for example, two surfaces parallel to the outer peripheral surface of the connecting pipe 40, and three corner portions are formed.

Each of the facing surfaces 31c and 31d has a tapered shape that is inclined with respect to the axial direction of the connecting pipe 40 inserted into the annular retaining ring 31, and the retaining ring 31 is reduced in diameter so that the opposing surfaces are When they abut each other, they can slide on each other. One of the facing surfaces 31c has a protrusion protruding toward the other facing surface 31a.
31e is provided. As shown in FIG. 2, the projection 31e projects from the facing surface 31c in a rectangular parallelepiped shape. The other facing surface 31d is provided with a rectangular parallelepiped recess 31f into which the rectangular parallelepiped projection 31e can be fitted.

In the present embodiment, the facing surface 31c provided with the protrusion 31e is located along the facing surface 31d along the opening 11 side of the joint body 10 when the protrusion 31e contacts the other facing surface 31d. The facing surfaces 31c and 31d are inclined so as to slide to. And
The concave portion 31e provided on the facing surface 31d is provided from the position where the protruding portion 31e faces in the state where the retaining ring 31 is not reduced in diameter.
Are provided at a predetermined distance in the sliding direction of the facing surface 31c provided with.

A locking portion 31a, which is notched in a stepwise manner, is formed over the entire circumference at an inner peripheral side portion on the inner back side of the joint body 10 in the retaining ring 31. The locking portion 31a is cut out so as to have, for example, two surfaces parallel to the outer peripheral surface of the connecting pipe 40, and three corner portions are formed.

Groove for retaining ring with retaining ring 31
The inner side of the joint body 10 has a space 13 slightly larger than the retaining ring 31. Groove for retaining ring 13
The inner side surface 13b of the joint body 10 is substantially orthogonal to the axis of the joint body 10. The bottom surface 13a of the groove 13 for the retaining ring has a taper portion on the opening 11 side of the joint body 10 that gradually decreases in diameter toward the opening 11 side.

As described above, in the pipe joint 1, the retaining ring 31 is fitted in the retaining ring recess groove 13 of the joint body 10.
Moreover, the seal material 20 is fitted and fixed in the groove 12 for the seal material. When the connecting pipe 40 is inserted from the opening 11 of the joint body 10, the tip of the connecting pipe 40 is inserted into the retaining ring 31. The retaining ring 31 inserted in the connecting pipe 40 is in a diameter-expanded state and is brought into close contact with the outer peripheral surface of the connecting pipe 40. When the connecting pipe 40 is further inserted into the joint body 10, the retaining ring 31 moves in parallel with the connecting pipe 40, and the inner side surface 13 of the retaining ring concave groove 13 inside the joint body 10.
Contact b. In this state, the connection pipe 40 is further inserted into the inner side of the joint body 10, and at this time, the side surface 13b of the retaining ring groove 13 is substantially orthogonal to the axis of the joint body 10. Since the state is in the state, the axial force of the joint body 10 acts on the retaining ring 13 from the side surface 13b, and the retaining ring 13 stops in a state of contacting the side surface 13b. The connecting pipe 40 is inserted into the joint body 10 to a predetermined length.

In such a state, clean water, for example, flows into the pipe joint 1 and the connection pipe 40 from the inner back side of the joint body 10. As a result, a force is applied to the connecting pipe 40 in a direction in which the connecting pipe 40 tends to come out of the joint body 10, and the connecting pipe 40 moves in a direction in which it comes out of the joint body 10. With this movement, the retaining ring 31 fitted on the connection pipe 40 in the joint body 10 moves in parallel with the connection pipe 40. And the retaining ring 31
As shown in FIG. 3, the bottom surface 13 of the groove 13 for the retaining ring
It abuts the tapered part at a.

In such a state, when the connecting pipe 40 further moves in the direction of coming out of the joint body 10,
As shown in the figure, a reaction force from the tapered portion of the retaining ring concave groove 13 is applied, and a force along the tapered portion and a force for reducing the diameter of the retaining ring 31 are applied. As a result, the retaining ring 31 is twisted by the twisting force in the direction indicated by the arrow A in FIG.

When the diameter of the retaining ring 31 is reduced, as shown in FIG. 4, the protrusion 31e provided on one facing surface 31c of the retaining ring 31 contacts the other facing surface 31d. In this state, when the connecting pipe 40 is further moved in the direction of coming out of the joint body 10 and the reaction force from the taper portion of the retaining ring concave groove 13 is applied to the retaining ring 31, the retaining ring 31 Is further reduced in diameter, and the gushing 31e of the facing surface 31c slides on the other facing surface 31d and is fitted into the recess 31f of the facing surface 31d. As a result, the opposing surfaces of the retaining ring 31
31c and 31d contact each other, and the retaining ring 31 is not reduced in diameter any more.

At this time, a twisting force acts on the retaining ring 31,
The retaining ring 31 is further twisted. The locking portion 31a of the retaining ring 31 bites into the outer peripheral surface of the connecting pipe 40 and is locked, as shown in FIG. As a result, the connection pipe 40 is stopped from moving in the direction in which it is trying to come out of the joint body 10.

In this state, the connecting pipe 40 and the joint body 10
When a larger force is applied in the direction of coming off, the retaining ring 31 tends to move integrally with the connecting pipe 40. At this time, since the protruding ring 31e and the recessed portion 31f of the facing surfaces 31c and 31d are fitted into the retaining ring 31, the opposing surfaces 31c and 31d are not slid and the retaining ring 31 is Not reduced in diameter. Therefore, the retaining ring 31 does not move along the tapered portion of the retaining ring groove of the joint body 10. The locking portion 31a of the retaining ring 31 is
Since the connecting pipe 40 is locked to the outer peripheral surface of the connecting pipe 40, the connecting pipe 40 is not moved in the direction of coming out of the joint body 10. Since the retaining ring 31 is not reduced in diameter, the retaining portion 31a of the retaining ring 31 retains the retaining state in which the retaining ring 31 is engaged with the outer peripheral surface of the connecting pipe 40 by a predetermined amount.

The cross-sectional shape of the retaining ring 31 is not limited to the shape of the above-described embodiment. For example, as shown in FIG. 6A, the cross-sectional shape is substantially circular and the locking portion 31a has two corners. It may have a part. In this case, the locking portion 31a
One of the corners may be projected slightly outward from the outer peripheral surface of the retaining ring 31 so that it can be securely locked to the outer peripheral surface of the connecting pipe 40. Further, as shown in FIG. 6 (b), the retaining ring 31 may have a substantially semicircular cross section, and a serrated engaging portion 31a may be provided on the entire inner peripheral surface thereof. Further, as shown in FIG. 6 (c), in the embodiment of FIG. 6 (b), one side portion may be cut out so as to form a flat surface.

Further, the protrusions on the respective facing surfaces 31 of the retaining ring 31
The shape of 31e is not limited to the rectangular parallelepiped shape, and may be, for example, a solder column as shown in FIG. 7 (a) or a triangular column as shown in FIG. 7 (b). In this case, the recess 31f of the other end surface 31d into which each protrusion 31e is fitted is
It has a semi-cylindrical or triangular prism shape that matches 31e.

(Effects of the Invention) In the pipe joint of the present invention, since the facing surfaces of the retaining ring are tapered and the facing surfaces are provided with the protrusions and the recesses that can be fitted to each other, When the retaining ring is reduced in diameter to a predetermined diameter, the protrusions and the recesses fit into each other, and the retaining ring is not further reduced in diameter. Therefore, even if a force is applied to the connecting pipe in the direction of coming out of the joint body, the locking force of the retaining ring with respect to the connecting pipe does not increase, and there is no possibility of damaging the connecting pipe.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of an essential part showing an example of the pipe joint of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is an essential part for explaining its operation. FIG. 4 is an enlarged view, FIG. 4 is a sectional view for explaining the operation thereof, FIG. 5 is an enlarged view of an essential part, and FIGS. 3A to 3C are sectional views showing other examples of the retaining ring, FIGS. 7A and 7B are side views of essential parts showing other examples of the protrusion and the recess of the retaining ring. 10 …… Coupling body, 11 …… Opening, 13 …… Recessed ring recess groove, 20 …… Seal material, 31 …… Retaining ring, 31a …… Locking part, 31c, 31d …… Opposed surface, 31e …… Projection, 31f …… Concave, 40
… Connection tube.

Claims (1)

(57) [Claims] 1. A cylindrical shape into which an end portion of a connecting pipe is inserted from an opening of one end, and a taper portion whose inner diameter is gradually reduced toward the opening portion. A joint body provided with a recessed groove, and an annular ring which is arranged in the recessed groove of the joint body and which is divided in a circumferential direction so as to have mutually parallel facing surfaces, A retaining ring that can be externally fitted to a connecting pipe inserted into the joint body, and the respective opposing surfaces of the retaining ring can slide when contacting each other. It is inclined with respect to the axial direction of the connecting pipe inserted into the retaining ring, and a protrusion is provided on one of the opposing surfaces, and a recess into which the protrusion can be fitted is provided on the other opposing surface. A pipe joint that is provided at a predetermined distance from the facing position of the protrusion in the sliding direction of the facing surface having the protrusion.