JPH10274371A - Telescopic flexible pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of strong pressure contact of a presser ring with a connecting pipe so as to improve the telescopic performance by providing a locking projection, on which an opening surface of a tip of each presser ring and a stopper provided at an intermediate part of a connecting pipe can abut, in opposite opening ends of each spherical ring. SOLUTION: When any one of water-line pipes connected to a case 1 is displaced downward by the settlement of ground or the like, a connecting pipe 6 and a spherical ring 2 are relatively slid for extension and shrinkage, and while the spherical ring 2 is turned in the case 1 so as to oscillate the connecting pipe 6 and so as to absorb the displacement of the water-line pipe. At this stage, when the connecting tube 6 is oscillated to the maximum, a tip surface 5a of a presser ring 5 abuts on an inclined stopper 13 of an annular projection 14. Consequently, direct and strong abutment of the presser ring 5 on the peripheral surface of the connecting pipe 6 is prevented, and a little clearance required for sliding is left between the spherical ring 2 and the connecting pipe 6. In this condition, when the force in the axial direction is applied to the water-line main pipe, the connecting pipe 6 is easily extended and shrunk without generating a resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic flexible pipe joint in which a pipe such as a water pipe is connected so as to be able to cope with a change in an embedded ground.

[0002]

2. Description of the Related Art A conventional pipe joint of this type is disclosed, for example, in Japanese Utility Model Laid-Open No. 57-189.

As shown in FIG. 4, large diameter cases d and d which are connected to respective ends of pipes a and b and have a concave spherical portion c on the inner peripheral surface at the tip end are shown in FIG. A spherical ring e is slidably fitted in the distal end of each joint pipe d such that the spherical surface of the outer peripheral surface is in close contact with the concave spherical part c, and slides in each spherical ring e in the tube axis direction. The connection pipe f fitted as possible, and the packing g interposed between the tip of the case d and the spherical ring e are pressed so as to be fixed to the outer peripheral surface of the tip of the case d, and And a pressing wheel h in which a concave spherical portion formed on the inner surface is slidably adhered to the outer peripheral surface of the distal end portion of the spherical ring e.

[0004] The connecting pipe f is prevented from coming off by the stopper rings i fitted on the outer peripheral surfaces of both ends thereof being engaged with the inward projections j provided on the inner surfaces of both ends of the spherical ring e. I have.

[0005]

In the conventional pipe joint described above, when both pipes a and b are maximally displaced at the joint as shown in the figure, the inner surface of the distal end of each pressing wheel h is connected to the connecting pipe f. Directly and strongly against the upper surface and the lower surface. In this state, when an expansion load is applied to both pipes a and b in the pipe axis direction, the frictional resistance of the contact portion between the pressing ring h and the connecting pipe f makes it impossible to slide relatively smoothly. Function may be impaired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and there is provided a telescopic flexible pipe joint in which the pressing ring is prevented from being strongly pressed against the connecting pipe, so that the elasticity can be improved. It is intended to provide.

[0007]

In order to achieve the above-mentioned object, a pipe joint according to the present invention comprises a pair of pipes whose inner peripheral surfaces are partly spherical and can be connected to respective opposed ends of a pipe body. A case, a pair of spherical rings fitted in each case while maintaining watertightness, and slidable while being in contact with the inner surface of the case; and movable along the outer peripheral surface of each spherical ring. The pressing ring fixed to the opening at the tip end of each case, the water ring is fitted inside the two spherical rings while maintaining the watertightness, and over the area between the stoppers provided at the intermediate portion and the outer peripheral surfaces at both ends. In a telescopic flexible pipe joint comprising a connecting pipe slidable relative to the pipe axis direction, at the open end portions of the spherical rings opposed to each other, a front opening surface of each of the pressing rings and an intermediate portion of the connecting pipe are provided. The present invention is characterized in that a locking projection which the stopper can contact is provided.

The contact surface between the stopper at the intermediate portion and the spherical ring in the locking projection is a vertical stopper surface and an inclined stopper surface facing the center of rotation of the spherical ring, respectively. It is preferable to make the surface contact.

According to the present invention, when one of the pipes connected to each case is displaced in the vertical direction and the connecting pipe fitted to each spherical ring swings as much as possible, the opening surface at the tip end of the pressing wheel. Is in contact with the locking projection provided at the opening end of the spherical ring, so that the pressing ring and the connecting pipe are prevented from being strongly pressed against each other.
Therefore, the elasticity of the connecting pipe is not impaired.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numerals 1 and 1 denote a pair of cases connected to respective ends of a water pipe or the like (not shown) via a flange portion 1a, and the inner and outer peripheral surfaces thereof have a spherical shape.

In each case 1, a spherical ring 2 whose outer peripheral surface has a spherical shape having substantially the same curvature as the inner peripheral surface of the case 1.
Are fitted through an annular packing 3 inserted into a concave groove on the inner surface of the distal end portion of the case 1 so as to be slidable while making surface contact. The annular packing 3 is pressed by a pressing wheel 5 fixed between a plurality of protrusions 4 on the outer peripheral surface of the distal end portion of the case 1 so that a slight gap is formed between the annular packing 3 and the outer peripheral surface of the spherical ring 2. ing.

In each spherical ring 2, a connecting pipe 6 has an annular packing 7 inserted into a concave groove on the inner surface of the distal end of the spherical ring 2.
And are slidably fitted through.

An annular stopper 8 is formed on the outer peripheral surface of the central portion of the connecting pipe 6 so as to protrude from both sides so as to have vertical contact surfaces.
Here, in the embodiment, the stopper 8 is provided at the center of the connecting pipe 6, but when the connecting pipe 8 is long, two stoppers 8 may be provided. In this case, both sides are located across the center. However, in the description of the invention, both of these cases are expressed as a stopper at the intermediate portion. A stopper ring 9 is fixed to the outer peripheral surfaces of both ends by a plurality of bolts 10.
By contacting the inwardly projecting annular projection 11 on the inner surface of the first member, the stopper is prevented from coming off, and the maximum amount of extension is regulated.

A connecting pipe 6 is provided at the opposite end of each spherical ring 2.
An annular locking projection 14 having a vertical stopper surface 12 orthogonal to the above and an inclined stopper surface 13 facing the direction of the rotation center o (see FIG. 2) of the spherical ring 2 is continuously provided outward.

When the vertical stopper surface 12 comes into contact with the stopper 8 of the connecting pipe 6, the maximum amount of shrinkage is regulated.
That is, the connecting pipe 6 and the two spherical rings 2 can relatively slide in a region between the center stopper 8 and the stopper rings 10 at both ends.

The tip end surface 5a of each push wheel 5 facing the direction of the center of rotation o is in contact with the inclined stopper surface 13. At this time, as shown in FIG. Corners are regulated.

In the pipe joint of the above embodiment, when one of the water pipes or the like connected to the case 1 is displaced downward due to land subsidence or the like, as shown in FIG. Are relatively slid and extended and contracted, and the spherical ring 2 rotates in the case 1 so that the connecting pipe 6 swings to absorb the displacement of the water pipe or the like.

At this time, when the connecting pipe 6 swings to the maximum, the distal end face 5a of the pressing wheel 5 comes into contact with the inclined stopper 13 of the annular projection 14. Therefore, as shown in FIG.
The pressing ring 5 does not directly contact the outer peripheral surface of the connecting pipe 6, and a very small gap required for sliding remains between the spherical ring 2 and the connecting pipe 6.

Therefore, when a force in the pipe axis direction is applied to the water main pipe in this state, the connecting pipe 6 can easily expand and contract without resistance, and the force in the pipe axis direction is absorbed.

Further, in the above embodiment, the vertical stopper surface 12 and the inclined stopper surface 13 are formed on the locking projection 14, and these are formed on both side surfaces of the stopper 8 and the distal end surface 5 of the spherical ring 5.
Since the contact is made with the surface a, the contact pressure acting on the contact surfaces is reduced, which is advantageous in strength.

Therefore, it is not necessary to make the locking projection 14 larger than necessary, and it is possible to prevent the amount of rotation of the spherical ring 2 from being greatly limited.

[0022]

According to the present invention, since the pressing ring is prevented from being strongly pressed directly with the connecting pipe, the elasticity of the connecting pipe is not impaired.

According to the second aspect of the present invention, since the surface pressure acting on the contact surface between the locking projection and the stopper and the spherical ring is reduced, the size of the stopper and the locking projection is minimized. Therefore, the amount of rotation of the spherical ring is not greatly limited.

[0024]

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional front view of a main part when the main part is displaced in the vertical direction.

FIG. 3 is an enlarged vertical sectional view of a main part showing a contact state between a pressing wheel and a locking projection.

FIG. 4 is a partially cutaway front view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 1a Flange part 2 Spherical ring 3, 7 Packing 4 Protrusion 5 Pressing ring 5a Tip surface 6 Connecting pipe 8 Stopper 9 Stopper ring 10 Bolt 11 Inward annular protrusion 12 Vertical stopper surface 13 Inclined stopper surface 14 Locking protrusion o Movement center

Claims (2)

[Claims] 1. A pair of cases each of which has a spherical inner peripheral surface and can be connected to each of the opposed ends of a tubular body, and is fitted into each of the cases while maintaining watertightness. A pair of spherical rings slidable while being in contact with the inner surface of the case, a pressing wheel fixed to an opening at the tip of each case so as to be able to move along the outer peripheral surface of each spherical ring, and the two spherical rings A connecting pipe fitted with watertightness therein and slidable relatively in the pipe axis direction over a region between stoppers provided on the intermediate portion and the outer peripheral surfaces at both ends. In the pipe joint, at opposite open end portions of the spherical rings,
A telescopic flexible pipe joint characterized in that a locking projection is provided, which can abut an end opening surface of each of the pressing rings and a stopper at an intermediate portion of the connecting pipe. 2. The stopper of the intermediate portion and the spherical ring, wherein the contact surface between the stopper at the intermediate portion and the spherical ring in the locking projection is a vertical stopper surface and an inclined stopper surface facing the rotation center direction of the spherical ring, respectively. 2. The telescopic flexible pipe joint according to claim 1, wherein the flexible tube joint comes into contact with the surface.