JP2563986B2 - Pipe fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) Recently, as a pipe joint used when piping water pipes, etc.,
Plug-in type pipe joints have been developed that 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 portion of the connecting pipe can be easily inserted therein and the end portion of the inserted connecting pipe cannot be easily pulled out.

Japanese Patent Publication No. 61-58714 discloses a pipe joint for restraining a connecting pipe inserted in the joint body by an outer cylinder and an inner cylinder arranged in the joint body. The inner cylinder and the outer cylinder of the pipe joint can be reduced in diameter and expanded, and the inner diameter of the inner cylinder is such that the end portion of the connecting pipe is not inserted.
It is slightly smaller than the outer diameter of the connecting pipe, expands when the connecting pipe is inserted into the connecting pipe, and is lightly bitten and fixed on the outer peripheral surface of the connecting pipe. When the connecting pipe is about to come out of the joint body,
The outer cylinder externally fitted to the inner cylinder is reduced in diameter by the tapered surface provided on the joint body, and the inner cylinder bites into the end portion of the connecting pipe and restrains it. The inner cylinder is provided with biting protrusions protruding inward and outward so that the connecting pipe to be inserted can be reliably restrained.

(Problems to be Solved by the Invention) In such a pipe joint, a biting protrusion protruding inward is formed in the inner cylinder, and when the connecting pipe is inserted into the inner cylinder, A large amount of force is required because the biting protrusion of the inner cylinder locks on the connecting pipe. When the outer cylinder is reduced in diameter by the tapered surface of the joint body in a state where the connecting pipe is inserted into the inner cylinder, the biting protrusion protruding inward of the inner cylinder bites into the outer peripheral surface of the connecting pipe. At this time, if the bite amount becomes large, the connecting pipe may be damaged. In particular, when the inner cylinder is made of metal and the connecting pipe is made of synthetic resin, the connecting pipe is likely to be damaged.

The present invention solves the above-mentioned conventional problems, and an object thereof is to easily insert a connecting pipe into a joint body,
Moreover, the connection pipe is securely prevented from coming off from the joint body,
Another object is to provide a pipe joint in which the connecting pipe is not damaged.

(Means for Solving the Problem) In the pipe joint of the present invention, the end portion of the connecting pipe has a tubular shape that is inserted from the opening portion at one end, and the inner peripheral side portion thereof becomes the opening portion side. The fitting body is provided with a concave groove having a conical taper portion that gradually reduces in diameter as a result, and is disposed in the concave groove of the pipe joint body, and is in contact with the tapered portion of the concave groove. An annular retaining ring that is partially divided in the circumferential direction so that the diameter can be reduced, and a cylindrical shape that is partially divided in the circumferential direction so that the diameter can be reduced and expanded by a meshed body of wire And a fitting tube body fitted to a retaining ring in the joint body and externally fitted to a connection pipe inserted into the joint body, By doing so, the above object 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 main body 10 externally fitted to an end portion of a connecting pipe 50, a sealing material 20 arranged in the joint main body 10, It has a retaining ring (30) and an engagement cylinder (40) arranged in the joint body (10).

The joint body (10) in the pipe joint of the present invention has an opening (11) into which the connecting pipe (50) is inserted at one end, and an annular groove (12) for sealing material is formed on the inner peripheral surface in the vicinity of the opening (11). It is provided. The sealing material groove 12 has a structure in which the opening 11 side portion is deep and the inner depth side portion is shallow.
A sealing material 20 made of rubber, for example, is fitted and fixed in the inside. The sealing material 20 is in close contact with the outer peripheral surface of the end portion of the connecting pipe 50 inserted into the joint body 10, and liquid-tightly seals the outer peripheral surface of the connecting pipe 50 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 30 is fitted in the retaining ring recess groove 13.

The retaining ring 30 is formed in an annular shape with a part cut out, for example, of steel or the like, and the diameter can be reduced and the diameter can be increased. The retaining ring 30 has a substantially circular cross section, and usually has an inner diameter such that the connecting pipe 50 inserted into the joint body 10 can be lightly pressed through the engaging cylinder 40. .

An inner peripheral side portion of the retaining ring 30 on the inner rear side of the joint body 10 is chamfered so that a corner portion is formed over the entire circumference, and the corner portion serves as a locking portion 31.
Retaining ring recess groove 13 with retaining ring 30
Has a space that is slightly larger than the retaining ring 30 at the inner back side of the joint body 10. Groove for retaining ring 13
Has a conical taper portion 13a on the opening 11 side of the joint body 10 that gradually reduces in diameter toward the opening 11 side.

On the inner peripheral surface of the joint body, a pipe end restriction portion 14 having a tapered diameter is formed on the inner rear side of the retaining ring concave groove 13. The pipe end restricting portion 14 has the same taper shape as the outer peripheral surface of the end portion of the connecting pipe 50 that has a tapered diameter.

The retaining ring 30 fitted into the retaining ring concave groove 13 is externally fitted to the engaging cylinder body 40. The engagement cylinder 40
Is formed in a cylindrical shape in which a part in the circumferential direction is divided by a mesh body formed by weaving a stainless steel wire rod having a rectangular cross section, and can be reduced in diameter and expanded in diameter. The inner back side end of the joint body 10 in the engagement cylinder 40 is
The pipe end regulating portion 14 of the joint main body 10, and hence the outer peripheral surface of the end portion of the connecting pipe 50, has the same tapered diameter.

The outer diameter of the engagement cylinder 40 is normally the retaining ring 30.
Is slightly larger than the inner diameter of the engaging cylinder 40, so that the retaining ring 30 can move integrally with the engaging cylinder 40 while being engaged with the engaging cylinder 40. Further, the inner diameter of the engagement cylinder 40 is normally
It is slightly smaller than the outer diameter of the connecting pipe 50.

As described above, in the pipe joint of the present invention, the retaining ring 30 is fitted in the retaining ring concave groove 13 of the joint body 10, and the engaging cylinder 40 is fitted in the retaining ring 30. Cage,
Moreover, the seal material 20 is fitted and fixed in the groove 12 for the seal material. At this time, the engagement cylinder body 40 is
10 The inner rear end is located slightly closer to the opening 17 side than the pipe end restricting portion 14. Further, the retaining ring 30 is fitted slightly to the inner side of the inner diameter of the joint body 10 from the middle of the engaging cylinder 40. It is slightly tightened, and the end surface of the opening 11 side is slightly expanded.

When the connecting pipe 50 is inserted from the opening 11 of the joint body 10 in such a state, the tip end of the connecting pipe 50 is engaged from the opening end of the engagement cylinder 40 in a slightly expanded state. As shown in FIG. 2 (a), the connecting pipe 40 penetrates into the tubular body 40 and abuts against the inner end of the tapered tubular body 10 of the engaging tubular body 40. At this time, the engagement cylinder 40 is in a diameter expanded state and its inner peripheral surface is in close contact with the outer peripheral surface of the connecting pipe 40 and the retaining ring.
It will be lightly pressed by 30.

When the connection pipe 50 is inserted into the joint body 10 in such a state, the engagement tube body 40 and the retaining ring 30 move to the inner rear side of the joint body 10 together with the connection pipe 50. The retaining ring 30 abuts on the inner side surface of the retaining ring groove 13, but when the connecting pipe 50 is further inserted into the inner side of the joint body 10, only the engaging cylinder 40 is It moves to the inner side of the joint body 10 together with the connecting pipe 50. Then, as shown in FIG. 2 (b), the outer peripheral surface of the end portion of the connecting pipe 50 contacts the pipe end regulating portion 14 of the joint body 10 via the tapered portion of the end portion of the engaging cylinder 40. By this, the insertion of the connecting pipe 40 is completed.

In such a state, for example, when clean water is passed through and internal pressure is applied, a force is applied to the connecting pipe 50 in a direction in which the connecting pipe 50 tries to come out of the joint body 10, and the connecting pipe 50 comes out of the joint body 10. Move to. Along with this movement, the engagement cylinder 40 and the retaining ring 30 also move integrally. The retaining ring 30 is a groove for retaining ring in the joint body 10.
The retaining ring 30 moves inside 13 and contacts the conical tapered portion 13a of the retaining ring recess 13. afterwards,
When the connecting pipe 40 further moves in the direction of coming out of the joint body 10, a reaction force from the conical taper portion is applied to the retaining ring 30, and as shown by an arrow A in FIG. A twisting force acts on the retaining ring 30, and the retaining ring 30 is reduced in diameter to press the engagement cylinder 40 inward. At this time, the locking portion 31 provided on the retaining ring 30 strongly presses the engaging cylinder body 40.

The engaging cylinder body 40 is pressed inward by the retaining ring 30, so that the portion in contact with the retaining ring 30 is deformed and its diameter is reduced. At this time, since the engaging cylinder 40 is formed of a mesh body formed by weaving a wire material having a rectangular cross section, each corner portion of each wire material forming the mesh body eats into the outer peripheral surface of the connecting pipe 50. At the same time, the diameter of part of the outer connecting pipe 50 is reduced. In this way, the pressing force of the retaining ring 30 is applied to the entire wire rod of the engagement cylinder 40, so the force applied from the corners of each wire rod is
It is distributed over a predetermined width of the outer peripheral surface of the connecting pipe 50. Therefore, there is no possibility that a force will be locally applied to the connecting pipe 50.

In this way, the connecting pipe 50 is strongly restrained by the retaining ring 30 via the engagement cylinder 40, and the connecting pipe 50 is connected to the joint body 10 by the retaining pipe 30.
Even if a force is applied to the connecting pipe 50, the connecting pipe 50 does not come off the joint body 10.

Note that the retaining ring 30 may have a circular cross section without the locking portion 31 as shown in FIG. 3 (a),
Further, as shown in FIG. 3 (b), a structure having a groove 32 for locking the wire rod in the engaging cylinder 40 over the entire circumference, or as shown in FIG. 3 (c), The configuration may be such that the protrusion 33 for locking the wire of the engagement cylinder 40 is provided over the circumference or partially.

(Effects of the Invention) The pipe joint of the present invention is arranged in the joint body in such a state that the retaining ring is externally fitted to the engagement cylinder body formed of the mesh-like body in which the wire rod is woven. Therefore, when the connecting pipe is inserted into the joint body without sharp corners, the frictional force applied to the connecting pipe inserted from the engagement cylinder is small, and the connecting pipe is easily inserted into the joint body. Can be inserted. Moreover, the force applied from the retaining ring to the connecting pipe is dispersed in the circumferential direction with a certain width by each wire of the engaging cylinder, so that no force is locally applied to the connecting pipe, There is no risk of damage. Since the retaining ring is disposed inside the joint body while being fitted onto the engaging cylinder, it is necessary to center the retaining ring when disposing the retaining ring inside the joint body. Absent.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing an example of a pipe joint of the present invention,
2 (a) to 2 (c) are cross-sectional views of a main part for explaining the operation thereof, and FIGS. 3 (a) to 3 (c) are cross-sectional views showing an example of the retaining ring. 10 …… Coupling body, 11 …… Opening part, 13 …… Retaining ring concave groove, 20 …… Seal material, 30 …… Retaining ring, 31 …… Locking part, 40 …… Engaging cylinder, 50 …… Connection tube

Claims (1)

(57) [Claims] 1. An end portion of a connecting pipe has a cylindrical shape which is inserted from an opening at one end, and has a conical shape whose inner peripheral portion gradually reduces in diameter toward the opening. A joint body provided with a concave groove having a tapered portion, and a part in the circumferential direction which is arranged in the concave groove of the pipe joint body so as to come into contact with the tapered portion of the concave groove to be able to reduce the diameter. It is formed into a cylindrical shape that is partly divided in the circumferential direction so that it can be reduced in diameter and expanded by a ring-shaped retaining ring that has been divided and a mesh body that is woven from a wire rod. A pipe joint, comprising: an engagement cylinder that is fitted in the retaining ring and is externally fitted to a connection pipe inserted into the joint body.