JPH01247888A - Pipe joint - Google Patents

Abstract

PURPOSE:To prevent machined chips from entering a connection pipe by disposing a detent member with a detent section and a water-permeable filter member in a groove having a tapered section in a joint body. CONSTITUTION:A filter member receiving groove 14 is provided at an inner part of a joint body 10 located deeper than a detent ring receiving groove 13 of the joint body 10. An annular filter member 50 is inserted in the filter member receiving groove 14. The filter member 50 is permeable and elastic and is fit over and comes in close contact with the outer circumference of a connection pipe 40 to be inserted into the joint body 10. As a result, the filter member 50 permits water such as city water to pass through the space between the inner circumferential surface of the joint body 10 and the outer circumferential surface of the connection pipe 40 and does not allow foreign matter to pass through.

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 within 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. A portion of the split ring is cut away in one circumferential direction, and the diameter can be reduced or expanded. When the split ring is not fitted onto the end of the connecting pipe,
It has a slightly smaller diameter than the connecting tube, and when the connecting tube is inserted into the joint body, the connecting tube is inserted into the split ring. The split ring expands in diameter when the connecting tube is inserted, and is fitted tightly 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 the tapered portion on the inner peripheral surface of the joint body, and its diameter is reduced.

It is locked to the connecting pipe.

(Problems to be Solved by the Invention) In such conventional pipe joints, cypress ≠ mock collar −, +
-"-J In order to increase the locking force between the daily split ring and the connecting pipe, an uneven locking part that bites into the outer circumferential surface of the connecting pipe is provided on the inner circumferential surface of the split ring. In this case, When the locking part locks on the outer peripheral surface of the connecting pipe, there is a risk that the locking part cuts the outer peripheral surface of the connecting pipe. , there is a high possibility that the connecting pipe and split ring will move relative to each other and the locking portion will cut the outer peripheral surface of the connecting pipe.As mentioned above, the split ring is made of steel and the connecting pipe is made of synthetic resin. If the connecting pipe is made of aluminum, there is a greater possibility that the locking part of the split ring will cut the connecting pipe.When the outer circumferential surface of the connecting pipe is cut by the split ring in this way, the cutting debris will enter the connecting pipe. When the connecting pipe is used as a water supply pipe, such cutting debris will get mixed into the tap water.If the pressure of the water flowing through the connecting pipe pulsates, the outer circumferential surface of the connecting pipe will break into a split ring. It will be cut further.

The present invention solves the above-mentioned problems of the conventional art, and its purpose is to provide a pipe joint in which there is no risk of cutting waste entering the connecting pipe even if the cutting waste is generated.

(Means for Solving the Problems) The pipe joint of the present invention has a cylindrical shape into which an end of a connecting pipe is inserted through an opening at one end, and an inner circumferential portion of the pipe joint is provided on the inner circumferential side thereof. A joint body provided with a concave groove having a tapered portion whose diameter gradually decreases as the diameter increases, and a connection disposed within the concave groove of the joint body and inserted into the joint body. A retaining member having an annular or cylindrical shape that can be fitted onto the pipe and having a locking portion that locks onto the outer peripheral surface of the connecting pipe by abutting the tapered portion of the groove, and a liquid retaining ring. Disposed on the inner back side of the joint body.

The above object is achieved by including a water-permeable filter member interposed between the joint body and the connecting pipe inserted into the joint body.

(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 main body 10 that is fitted onto the end of a connecting pipe 40, and a joint main body 1
The sealing material 20 disposed inside 0 and the joint body 10
It has a retaining ring 31 and a filter member 50 disposed therein.

The joint body 10 in the pipe joint 1 of the present invention has, at one end,
It has an opening 11 into which the connecting pipe 40 is inserted, and the opening t
An annular sealing material groove 12 is provided on the inner circumferential surface near i. 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 20c,
It comes into close contact with the outer circumferential surface of the end of the connecting tube 40 inserted into the joint body IO, and liquid-tightly seals the outer circumferential surface of the connecting tube 40 and the inner circumferential surface of the joint body IO.

On the inner circumferential surface of the joint body 10 on the axially inner side of the joint body 10 relative to the sealing material groove 12, there is a groove for a set ring! 3 is provided. A retaining ring 31 is fitted into the groove 13 for the edge retaining ring. Further, a filter member groove 14 is provided on the inner circumferential surface of the edge retaining ring groove 13 on the further axially inner side, and the filter member 50 is fitted into the filter member groove 14. has been done.

The retaining ring 31 is formed of, for example, steel into an annular shape with a portion of the circumference cut away. The edge retaining ring 31 has a substantially circular cross section.

The inner diameter of the edge retaining ring 31 is slightly smaller than the outer diameter of the connecting tube 40 inserted into the joint body 10, and when the connecting tube 40 is inserted into the edge retaining ring 31.

The edge retaining ring 31 expands in diameter and comes into close contact with the outer peripheral surface of the connecting pipe 4o.

A locking portion 31a cut out in nine steps is formed over the entire circumference of the retaining ring 31 on the inner peripheral 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 4o, and three corners are formed.

The retaining ring concave groove 13 into which the retaining ring 31 is fitted has a space slightly larger than the edge retaining ring 31 on the inner back side of the joint body 10 . A side surface 13b of the edge retaining ring concave groove 13 on the inner side of the joint body lo is approximately perpendicular to the axis of the joint body 10. In the edge retaining ring concave groove 13, a filter member concave groove 14 is provided further inside the joint body 10 than the retaining ring concave groove 13 of the joint body 10.
An annular filter member 5o is fitted into the filter member groove 14. The filter member 5o has water permeability and elasticity, and is fitted onto the outer circumferential surface of the connecting tube 4 inserted into the joint body 10 so as to be in close contact with the outer circumferential surface of the connecting tube 4o.

Therefore, the filter member 5o allows water such as clean water to pass between the inner peripheral surface of the joint body 10 and the outer peripheral surface of the connecting pipe 40,
Foreign objects in the water are not allowed to pass through.

In this way, in the pipe fitting l, the retaining ring 31 is fitted into the retaining ring groove 13 of the joint body 10, and the sealing material 20 is fitted into the retaining groove 12. The filter members 50 are respectively fitted into the filter member concave grooves 14 and each one is fixedly disposed. Then, when the connecting tube 40 is inserted from the opening 11 of the joint body 10, the tip of the connecting tube 40.

It 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 tube 40 is further inserted into the joint body 10, the retaining ring 31 moves in parallel with the connecting tube 40, and the edge retaining ring 31 moves in parallel with the connecting tube 40.
Inner back side surface 1 of joint body 10 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
1 stops in contact with the side surface 13b as shown in FIG.

In this state, when the connecting tube 4o is further inserted into the innermost side of the joint main body 1O, the distal end portion of the connecting tube 4o is inserted into the filter member 5o provided on the innermost side. The filter member 50 is in close contact with the outer circular surface of the connecting tube 4o.

The 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 4o from the innermost side of the joint body 10.

As a result, a force is applied to the connecting pipe 4o in the direction of pulling it out from the joint body 10, and the connecting pipe 40
Move in the direction away from 0. Along with this movement, the retaining ring 31 fitted onto the connecting pipe 4o inside the joint body 1O
moves in parallel with the connecting pipe 4o. Then, the retaining ring 31 in the joint body 10 comes into contact with the tapered portion 13a of the retaining ring concave groove 13. In this state, if the connecting pipe 4o further moves in the direction of coming out of the joint body 10.

A reaction force from the tapered portion 13a of the retaining ring recess 13 is applied to the retaining ring 31.
A force along the line is applied. As a result, the retaining ring 31
A torsional force acts in the direction shown by arrow A in FIG. 2, as shown by the two-dot chain line in FIG.

A locking portion 31a of the liquid leakage prevention ring 31 is locked to the outer circumferential surface of the connecting pipe 40. When the connecting pipe 4° further moves in the direction of coming out from the joint body IO in this state, the retaining ring 31 is pressed against the tapered portion 13a of the retaining ring concave groove 13, and the locking portion 31a is attached to the connecting pipe. Cut into the outer circular surface by 4 degrees. As a result, the movement of the connecting pipe 4o in the direction in which it attempts to come off from the joint body 10 is stopped.

At this time, part of the clean water passes through the water-permeable filter member 50 disposed on the inner back side of the retaining ring 31 in the joint body 10 and enters the retaining ring concave groove 13 of the joint body 10. Water flows in. Concave groove 13 for retaining ring
The water flowing inside acts to press the retaining ring 31 against the tapered portion 13a of the retaining ring concave groove 13. At the same time, the pressure on the inside and outside of the connecting pipe 4° is equalized to prevent the connecting pipe 4° from breaking.

When the locking portion 31a of the retaining ring 31 locks on the connecting tube 4o, the locking portion 31a may cut the outer peripheral surface of the connecting tube 4o. Further, when a higher pressure is applied to the connecting pipe 4o from the tap water, the connecting pipe 4o moves to come out of the joint body 10. At this time, the retaining ring 31 is
Since it is further pressed against the tapered part 13a of the retaining ring concave groove 13, the locking part 31a of the retaining ring 31
further bites into the outer peripheral surface of the connecting pipe 4o. At this time of biting, the locking portion 31 of the retaining ring 31 is attached to the connecting pipe 40.
When the outer circumferential surface of the joint body 10 is cut, cutting debris may be generated between the joint body lO and the connecting pipe 40. However, such cutting waste.

It is trapped between the sealing material 2o and the fill member 5o interposed between the inner circumferential surface of the joint body 10 and the outer circumferential surface of the connecting pipe 4o, and there is no risk of it flowing out from the gap.

Therefore, even if cutting waste is generated when the locking portion 31 of the retaining ring 31 is locked to the outer peripheral surface of the connecting pipe 40, the cutting waste will be mixed into the tap water flowing through the connecting pipe 40. There is no risk of it happening.

FIG. 3 is a partially cutaway sectional view showing another embodiment of the pipe joint of the present invention. In this embodiment, a protrusion 13d that protrudes from the inner circumferential surface of the joint body is provided at the innermost part of the retaining ring groove 13 on the inner circumferential surface of the joint body 10, and the protrusion 13d A water-permeable and elastic annular filter member 5o is secured to the filter member 5o. A retaining ring 31 is concentrically engaged with the joint body 10 on the side surface of the filter member 5o on the side of the retaining ring concave groove 13.

In this embodiment, since the retaining ring 31 is fixed concentrically to the joint body 10, the connecting pipe 40 inserted into the joint body IO can be easily inserted into the retaining ring 31. .

FIG. 4 shows still another embodiment of the present invention. In this embodiment, similarly to the embodiment shown in FIG. 3, a protrusion 13d is provided on the inner back side of the retaining ring concave groove 13, and the protrusion 13d and the joint body! An annular filter member 50 having water permeability and elasticity is disposed between the filter member 50 and the inner circumferential surface of the filter member 0 on the further inner side.

A retaining ring 31 is locked to the side surface of the filter member 50 on the side of the retaining ring concave groove 13 so as to be concentric with the joint body 10 .

In this embodiment, the connecting pipe 40 inserted into the joint body IO
is inserted into the retaining ring 31, the retaining ring 31 is pressed against the filter member 50, and the movement of the retaining ring 31 is stopped.

In the above embodiment, the retaining ring 31 having a substantially circular cross section is used; It is also possible to use a retaining member having a tapered surface whose diameter gradually decreases toward the side.

(Effects of the Invention) As described above, the pipe joint of the present invention has the advantage that even if cutting debris is generated by cutting the outer circumferential surface of the connecting pipe when the retaining member engages with the outer circumferential surface of the connecting pipe, Since debris is prevented from flowing into the connecting pipe by the filter member, cutting debris will not be mixed into the tap water even when water is allowed to flow through the connecting pipe.

Since the filter member is water permeable, water can flow through the connecting pipe.

It flows to the outside of the connecting pipe. Therefore, even if the inside of the connecting pipe becomes high pressure due to flowing water, a pressure equal to the high pressure is applied to the outer peripheral surface of the connecting pipe.

There is no risk of damage to the connecting pipe.

4. Figure 1 is a partially cutaway sectional view showing an example of the pipe joint of the present invention.
FIG. 2 is an enlarged view of a main part for explaining its operation, and FIGS. 3 and 4 are partially cutaway sectional views of other embodiments of the pipe joint of the present invention.

l...Pipe fitting, 10...Joint body, 11...
Opening portion, 12... Groove for sealing material, 13... Groove for retaining ring, 14... Groove for filter member, 20... Seal material, 31... Retaining ring, 3
1a...Locking portion, 40...Connecting pipe, 50...Filter member.

that's all

Claims (1)

[Claims] 1. A tube having a cylindrical shape into which the end of the connecting pipe is inserted through an opening at one end, the inner circumferential portion of which gradually becomes smaller in diameter as it approaches the opening. A joint body is provided with a concave groove having a tapered portion with a reduced diameter as shown in FIG. or a retaining member that is cylindrical and has a locking portion that locks onto the outer circumferential surface of the connecting pipe by abutting against the tapered portion of the concave groove; A pipe joint comprising: a water-permeable filter member disposed and interposed between the joint body and a connecting pipe inserted into the joint body.