JPH01247885A - Pipe joint - Google Patents

Abstract

PURPOSE:To prevent a connection pipe from being damaged even if a high pressure pipe is added by disposing detent rings having detent surface parallel to a tapered portion of a conically tapered portion of a joint body and a detent sections to engage with the outer circumference surface respectively in a groove having a conically tapered portion, of a joint body. CONSTITUTION:A groove 13 for detention is disposed on the inner circumference of a joint body 10 at a position located axially deeper than a groove 12 for a detent ring. A detent ring 31 is fit in the detent groove 13. The detent ring 13 is provided with a detent section 31a and a detent surface 31b. The detent surface 31b is formed of a cross section having a planar cut over its entire circumference at a position slightly displaced on the side of an opening 11 of the joint body 10 from a position approximately in central symmetry with respect to the detent section 31a. The detent surface 31b becomes parallel to the conical tapered section 13a of the groove 13 as the detent ring 31 is twisted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pipe joint used for piping such as water pipes and gas pipes.

(Conventional technology) As a pipe fitting used for plumbing such as water pipes.

Recently, plug-in type pipe joints have been developed that can secure connecting pipes by simply inserting the pipes 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 that the inserted end of the connecting pipe cannot be easily removed. For this reason, with plug-in type pipe fittings, it is usually necessary to fix the connecting pipe inside the cylindrical joint body, as disclosed in Japanese Patent Publication No. 54-21905, Japanese Patent Publication No. 55-25317, etc. A split ring is provided. The split ring is partially split in the same direction and can be contracted or expanded in diameter. This split ring has a slightly smaller diameter than the connecting pipe when it is not externally fitted onto the end of the connecting pipe, and when the connecting pipe is inserted into the fitting body, the connecting pipe is inserted into the split ring. inserted into. The split ring expands in diameter when the connecting tube is inserted, and is fitted onto the outer peripheral surface of the connecting tube. When the connecting pipe is about to come out of the joint body, the split ring comes into contact with a tapered portion on the inner circumferential surface of the joint body, and its diameter is reduced, and the divided portion is locked to the connecting pipe.

(Problem to be solved by the invention) In such conventional pipe joints, in order to increase the locking force between the connecting pipe and the split ring, the split ring is attached to the connecting pipe. The 80-split ring must be made longer in the axial direction of the connecting pipe so that it can be locked over a wide area. However, in this case, the cross-sectional area of the split ring becomes large, and a large amount of force is required when inserting the connecting pipe into the split ring.

Also, since it becomes difficult to deform the 90% ring,
It is not easy to fit the split ring into a predetermined position within the joint body.

The present invention solves the above-mentioned conventional problems, and its purpose is to be able to insert the connecting pipe into the joint body with a relatively small force, and to prevent the connecting pipe from coming off the joint body. Our goal is to provide large pipe fittings.

Still another object of the present invention is to provide a pipe joint that does not cause damage to the connecting pipe even when high pressure is applied to the connecting pipe.

(Means for Solving the Problems) The pipe joint of the present invention has a cylindrical shape in which the end of the connecting pipe is inserted through an opening at one end, and the inner circumferential side of the pipe joint has a cylindrical shape that is inserted into the opening at one end. A joint body is provided with a concave groove having a conical taper portion whose diameter gradually decreases as the diameter increases, and the joint body is disposed within the concave groove.

- It has an annular shape that can be fitted onto the connecting pipe inserted into the joint body, and has a substantially circular cross section that is twisted by coming into contact with the conical taper part of the groove.

The above object is achieved by including a retaining ring having a locking surface parallel to the tapered portion and a locking portion locking to the outer circumferential surface of the connecting tube by twisting the locking ring.

(Example) The present invention will be described below with reference to Examples.

As shown in FIG. 1, the pipe joint of the present invention includes a cylindrical joint body lO that is fitted onto the end of an 8-connection pipe 40,
The sealing material 20 disposed inside O and the joint body lO
It has a retaining ring 31 disposed therein.

The joint body 10 in the pipe joint l of the present invention has, at one end,
It has an opening 11 into which the connecting pipe 40 is inserted, and the opening 1
An N-shaped sealing material concave groove 12 is provided on the inner circumferential surface of the vicinity of the sealing member 1 . The sealing material concave groove 12 is.

The opening ll side is deep and the inner back side is shallow,
A sealing material 20 made of, for example, rubber is fitted into the sealing material groove 12 and fixed therein. The sealing material 20 is
It comes into close contact with the outer circumferential surface of the end of the connecting tube 40 inserted into the joint body 10, and liquid-tightly seals the outer circumferential surface of the connecting tube 40 and the inner circumferential surface of the joint body 10.

A correcting ring groove 13 is provided on the inner circumferential surface of the joint body 10 on the axially innermost side of the joint body lO than the sealing material groove 12. A retaining ring 31 is fitted into the cough retaining ring concave groove 13.

The cough stopper ring 31 is made of, for example, steel and is formed into an annular shape with a portion cut out. Cough ring stop ring 31
has a substantially circular cross-section, and has a slightly smaller outer diameter than the outer diameter of the connecting tube 40 inserted into the joint body lO, and when the connecting tube 40 is inserted into the stopper ring 31, the cough The retaining ring 31 expands in diameter and comes into close contact with the outer peripheral surface of the connecting pipe 40.

A locking portion 31a cut out in a single step shape is formed over the entire circumference of the cough stopper ring 31 on the inner peripheral side of the inner body side of the joint body 10. For example, the locking portion 31a is cut out so as to have two surfaces parallel to the outer circumferential surface of the connecting pipe 40, and three corner portions are formed.

The retaining ring concave groove 13 into which the retaining ring 31 is fitted has a space slightly larger than the retaining ring 31 on the inner back side of the joint body 10 . The side surface 13b on the inner back side of the one-handed main body lO in the groove 13 for the retaining ring is
It is approximately orthogonal to the axis of the joint body 10.

The retaining ring concave groove 13 is located at the opening l of the joint body lO.
On the l side, there is a conical tapered part 13a whose diameter gradually decreases toward the opening ll side.

When the retaining ring 31 is fitted onto the connecting pipe 40 and moves in the direction in which the connecting pipe 40 is removed from the joint body 10, the retaining ring 31 is moved in the tapered portion 1 of the retaining ring concave groove 13.
3a. At this time, since the outer peripheral surface of the retaining ring 31 that comes into contact with the tapered portion 13a has an arc shape, the retaining ring 31 is twisted by the reaction force from the tapered portion 13a, and the locking portion 31a is connected. It bites into the tube 40. When the connecting pipe 40 tries to come out further from the joint body 10, if the outer peripheral surface of the retaining ring 31 that comes into contact with the tapered part 13a of the retaining ring concave groove 13 is arc-shaped,
The locking ring 31 is further twisted, and the locking portion 31
There is a risk that the portion a may be twisted to the point where it is no longer engaged with the outer circumferential surface of the connecting tube 40.

The present invention aims to solve such problems.

The retaining ring 31 is provided with a locking surface 31b.

In its cross section, the locking surface 31b is located at a position that is approximately centrally symmetrical to the locking portion 31a, and is slightly closer to the opening l of the joint body lO.
A planar cutout is formed over the entire circumference at the l side position. The locking surface 31 becomes parallel to the conical tapered portion 13a of the retaining ring concave groove 13 in the joint body 10 as the retaining ring 31 is twisted.

In this way, the pipe fitting l has the retaining ring 31 fitted into the retaining ring concave groove 13 of the joint body 10, and the sealing material 20 being fitted into the sealing material concave groove 12, so that it is fixed. has been done. Then, when the connecting pipe 40 is inserted from the opening 11 of the joint body IO.

The distal end of the connecting tube 40 is inserted into the retaining ring 31. The retaining ring 31 inserted into the connecting tube 40 has an expanded diameter and is brought into close contact with the outer circumferential surface of the connecting tube 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,
Rear side surface 1 of joint body lO of groove 13 for retaining ring
3b. In this condition.

The connecting pipe 40 is further inserted into the inner side of the joint body 10, but at this time, the side surface 13 of the groove 13 for the retaining ring
b is substantially perpendicular to the axis of the joint body 10, so a force in the axial direction of the joint body 10 acts on the retaining ring 31 from the side surface 13b, and the retaining ring 31
stops in contact with the side surface 13b. Connecting pipe 40
is inserted into the joint body 10 to a predetermined length.

In this state, water, for example, water, flows into the pipe joint l and the connecting pipe 40 from the innermost side of the joint body lO.

As a result, a force is applied to the connecting pipe 40 in the direction of pulling it out from the joint body IO, and the connecting pipe 40
Move in the direction leaving O. With this movement, the retaining ring 31 fitted onto the connecting pipe 40 inside the joint body 10
moves in parallel with the connecting pipe 40. Then, the peripheral surface of the retaining ring 31 adjacent to the locking portion 31b is as shown in FIG.

It comes into contact with the conical tapered portion 13a of the retaining ring concave groove 13.

In this state, when the connecting pipe 40 further moves in the direction of coming out from the joint body lO, the retaining ring 31
As shown in FIG. 2, a reaction force is applied from the conical tapered portion 13a of the retaining ring concave groove 13.

A force is applied along the tapered portion 13a. Due to this.

A twisting force acts on the retaining ring 31 in the direction indicated by arrow A in FIG. It is locked. At this time, the locking surface 31b of the retaining ring 31 is as shown in FIG.

When the retaining ring 31 is twisted, it becomes parallel to the conical tapered portion 13a of the retaining ring concave groove 13 and comes into surface contact with the tapered portion 13a. As a result, the force applied to the retaining ring 31 in the twisting direction is reduced, and the locking portion 31a is held in a state where it bites into the outer peripheral surface of the connecting tube 40 by a predetermined amount. And the connecting pipe 40 is 1w1
Movement in the direction in which the hand attempts to escape from the main body IO is stopped.

Even if a force is applied to the connecting pipe 40 in the direction in which it comes off from the joint body IO, the locking portion 31b of the retaining ring 31 is in surface contact with the conical taper portion 13a of the retaining ring concave groove 13. The retaining ring 31 is for the cedar board.

It won't get twisted. Therefore, the cedar plate prevents the locking part 31a from being unlatched from the outer peripheral surface of the connecting pipe 40 due to excessive twisting of the tying ring 31, and the connecting pipe 40 is securely prevented from coming off in the joint body lO. The locking surface 31a of the ring 31 is prevented from coming off. In addition, the locking surface 3 of the retaining ring 31
1a comes into contact with the tapered portion 13a of the retaining ring concave groove 13, thereby preventing the tapered portion 13a from being pressed more strongly against the arcuate outer peripheral surface of the retaining ring 13, and also preventing the risk of damaging the tapered portion 13a. do not have.

(Effects of the Invention) Since the pipe joint of the present invention uses the retaining ring having a substantially circular cross section as described above, the cedar plate can easily insert the connecting pipe into the retaining ring.

When the cedar board moves in the direction in which the connecting tube is removed, torsional force is applied to the retaining ring, which locks the connecting tube to the outer circumferential surface of the connecting tube, thereby reliably preventing the connecting tube from coming off.

When the retaining ring is twisted by a predetermined amount, the locking surface of the retaining ring becomes parallel to the tapered part of the groove for the retaining ring, and comes into surface contact with the tapered part. No further torsional forces act on the ring. Therefore, the locking portion of the retaining ring is held in a state where it bites into the outer peripheral surface of the connecting tube by a predetermined amount, and the retaining ring can reliably prevent the connecting tube from coming off from the joint body.

Even if a further force is applied in the direction in which the connecting pipe comes out of the joint body, the retaining ring is twisted excessively and the locking part does not release its lock with the outer circumferential surface of the connecting pipe, and the connecting pipe 40 is pulled out of the joint body. It is definitely prevented from falling out from 10. Further, since the entire locking surface of the retaining ring is pressed against the tapered portion, the retaining portion of the retaining ring does not bite deeply into the connecting tube, and damage to the connecting tube is prevented.

The partially broken side view, FIGS. 2 and 3 are enlarged views of essential parts for explaining the operation.

DESCRIPTION OF SYMBOLS 1... Pipe joint, 10... Fitting body, 11... Opening, 12... Concave groove for sealing material, 13... Concave groove for retaining ring, 13a... Conical taper part , 1
3b...Side surface, 20...Sealing material, 31...Keeping ring, 31a...Locking portion.

that's all

Claims (1)

[Claims] 1. The end of the connecting pipe has a cylindrical shape that is inserted through an opening at one end, and the inner peripheral portion thereof has a diameter that gradually decreases as it approaches the opening. a joint body provided with a concave groove having a conical tapered portion; and a locking portion that has a substantially circular cross section that is twisted by coming into contact with the conical tapered portion of the groove, and that due to the twisting, locks a locking surface parallel to the tapered portion and a locking portion that locks on the outer peripheral surface of the connecting pipe. A pipe joint comprising a retaining ring and a pipe joint.