JP2001208266A - Insert type pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and quickly insert one end of a pipe in a sealed and pull-out prevented state and facilitate the assembling of an elastic seal ring and a lock ring. SOLUTION: An outer cylinder body 6 is screw-connected to an outer cylinder body holding bass 9 of a joint body 1 so as to form a pipe insertion clearance 12 toward an inner cylinder body 5. Before screwing of the outer cylinder body 6, the elastic seal ring 2 and a collar 14 are tentatively held around the outer circumference of the inner cylinder body 5 and the lock ring 3 is tentatively held to the outer circumference of the collar 14. When a pipe P is inserted in a pipe insert clearance 12, a space between the internal circumference of the pipe P and the outer circumferential face of the inner cylinder body 5 is sealed by the elastic seal ring 2, and the collar 14 is pushed into a collar relief clearance 10 from one end of the pipe P so that a bite tooth 3a of the lock ring 3 bites in the outer circumferential face of the pipe P. When a stopper 16 is screwed and advanced, the lock ring 3 is pushed so that the biting of the bite tooth 3a into the pipe P is released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug-in type pipe joint which is used for hot water supply and water supply pipes, and which can easily and quickly insert one end of the pipe in a sealing shape and a retaining shape.

[0002]

2. Description of the Related Art This type of plug-in type pipe joint is disclosed in, for example, Japanese Patent Application Laid-Open No. 11-2377 and Japanese Patent Application Laid-Open No. 11-118081.
It is publicly known in Japanese Patent Publication No. The plug-in type pipe joint disclosed in Japanese Patent Application Laid-Open No. H11-2377 has a sealing rubber ring which is in close contact with the outer peripheral surface of a pipe to be inserted, and a bite portion which bites into the outer peripheral surface of the pipe. The formed collet is incorporated. JP-A-11-118
In the plug-in type pipe joint described in Japanese Patent Publication No. 081, the elastic seal ring and the collet which are tightly attached to the outer peripheral surface of the pipe to be inserted are incorporated into the joint main body. The ring is formed and incorporated separately from the collet.

[0003]

However, in any of the aforementioned plug-in type pipe joints, the rubber ring for sealing or the elastic seal ring must be fitted on the inner periphery of the joint body, and this fitting is not easy. Was.

The present invention has been made to solve such a problem, and an elastic seal ring can be easily and quickly inserted into one end of a pipe in a sealed and retaining shape. It is an object of the present invention to provide a plug-in type pipe joint which can facilitate installation of a lock ring.

[0005]

The invention according to claim 1 of the present invention comprises, as illustrated in FIG. 2, a tubular joint main body 1;
It comprises an elastic seal ring 2 and a lock ring 3,
The joint body 1 has inner and outer double cylinders 5 and 6 at one end in the axial direction, of which the inner cylinder 5 is formed integrally with the joint body 1, and the outer cylinder 6 is connected to the joint body 1. Formed separately,
A female screw 7 is cut in the inner periphery of one end thereof, and an outer cylinder holding boss 9 is protruded concentrically with the inner cylinder 5 with a gap 10 for collar escape on the outer periphery of the root of the inner cylinder 5 of the joint body 1. Set up
A male screw 11 is cut on the outer periphery of the outer cylinder body holding boss 9, and the female screw 7 of the outer cylinder body 6 is screwed and connected to the male screw 11 to release the collar between the outer cylinder body 6 and the inner cylinder body 5. A pipe insertion gap 12 communicating with the gap 10 is formed, and a seal ring groove 13 is formed on the outer periphery of the inner cylindrical body 5.
The elastic seal ring 2 which is in close contact with the inner peripheral surface of a pipe inserted into the pipe insertion gap 12 is fitted into the seal ring groove 13 and is smaller than the inner diameter of the outer cylindrical body holding boss 9. A collar 14 having an outer diameter is axially disposed on the outer periphery of the inner cylinder 5 so as to be located between the elastic seal ring 2 on the outer periphery of the inner cylinder 5 and the open end of the outer cylinder holding boss 9. The lock ring 3 which is slidably fitted to the outer periphery of the collar 14 and has a bite-tooth 3a which bites into the outer peripheral surface of the pipe is temporarily fixed and held in an expanded state in which the lock ring 3 is deformable. An outer tapered pressing surface 19 is formed on the inner peripheral surface of the outer cylindrical body 6 so as to apply a force in the diameter reducing direction to the lock ring 3 when the inserted tube moves in the exit direction. It is characterized by being performed.

According to the first aspect of the present invention, the outer peripheral surface of the inner cylindrical body is exposed to the outside before the outer cylindrical body is screwed and connected to the outer cylindrical body holding boss of the joint main body when assembling the joint main body. In this state, the elastic seal ring, the collar, and the lock ring can be easily fitted on the outer periphery of the inner cylinder. After fitting the elastic seal ring, the collar, and the lock ring, screw the outer cylinder to the outer cylinder holding boss of the joint body, and assemble the joint body so as to form a pipe insertion gap between the inner and outer cylinders. Can be.

[0007] When one end of the pipe is inserted into the pipe insertion gap of the assembled joint body, the space between the inner peripheral surface of the pipe and the outer peripheral surface of the inner cylinder is sealed by an elastic seal ring, and the inserted pipe is inserted. The collar is pushed out of the lock ring by one end of the lock ring, and is pushed into the gap for releasing the collar. With this pushing, the lock ring is reduced in diameter, and the biting teeth lightly bite into the outer peripheral surface of the tube. Next, when the pipe is pulled in the withdrawal direction, the outer periphery of the lock ring abuts on the tapered pressing surface of the outer cylindrical body, thereby reducing the diameter of the lock ring and cutting the teeth into the outer peripheral surface of the pipe. Bite increases. This can prevent the pipe from coming out of the pipe insertion gap of the joint body.

According to a second aspect of the present invention, in the plug-in type pipe joint according to the first aspect, there is provided a cylindrical joint having an inner diameter through which a pipe to be inserted can be inserted, and having an external thread 15 cut on the outer periphery. The stopper 1 has a stopper 16.
6 is screwed into a female screw 8 cut on the inner circumference at the other end of the outer cylindrical body 6 so as to be able to advance and retreat in the axial direction, and the lock ring 3 is disposed on an extension of the tip of the stopper 16. Is what it is.

According to the second aspect of the present invention, when the pipe is removed from the joint main body at the time of reinsertion or the like, when the stopper is screwed and advanced, the lock ring is pushed by the tip of the stopper, and the outer cylindrical body is pushed. Is released from the tapered pressing surface and the bite teeth are released from biting into the tube, so that the tube can be removed from the joint body.

According to a third aspect of the present invention, in the plug-in type pipe joint according to the first or second aspect, the elastic seal rings 2a,
2b are arranged inward and outward in the axial direction, and the outer diameter of the inner elastic seal ring 2a is set to the outer elastic seal ring 2a.
It is set larger than the outer diameter of b.

According to the third aspect of the present invention, the degree of adhesion between the innermost elastic seal ring and the inner peripheral surface of the pipe is greater than the degree of adhesion between the outer elastic seal ring and the inner peripheral surface of the pipe. And the sealing effect of the elastic seal ring can be further enhanced.

[0012]

Embodiments of the present invention will be described with reference to the drawings. 1 is an exploded cross-sectional view of a plug-in type fitting according to an embodiment, FIG. 2 is a partially cutaway cross-sectional view of the plug-in type fitting in an assembled state, and FIG. 3 is a fitting of an elastic seal ring of the plug-in type fitting. FIG. 4 is an enlarged sectional view of a portion, FIG. 4 is a partially cutaway sectional view of a state immediately after inserting a pipe into the plug-in type pipe joint of FIG.
FIG. 5 is a partially cutaway sectional view showing a state where the insertion of the pipe is completed, and FIG. 6 is a partially cutaway view showing a state where the pipe can be extracted.

1 and 2, this plug-in type pipe joint comprises a joint body 1, an elastic seal ring 2, and a lock ring 3. The joint main body 1 is made of bronze casting and is formed in a cylindrical shape, and has a structure having inner and outer double cylindrical bodies 5 and 6 at one axial end thereof. The inner cylinder 5 is formed integrally with the joint body 1, while the outer cylinder 6 is formed separately from the joint body 1, and has internal threads 7 at one end inner circumference and the other end inner circumference. , 8 are cut. Outer cylinder 6
At the intermediate portion between the internal threads 7 and 8 on the inner peripheral surface, an outer constricted tapered pressing surface 19 constricted toward the other end of the outer cylindrical body 6 is formed.

An outer cylinder holding boss 9 is provided on the outer periphery of the base of the inner cylinder 5 of the joint body 1 so as to project concentrically with the inner cylinder 5 with a gap 10 for collar escape. A male screw 11 is cut on the outer periphery of 9. The outer cylinder 6 is screwed with the female screw 7 at one end thereof into the male screw 11 of the outer cylinder holding boss 9, so that the pipe insertion gap 12 is formed between the inner periphery of the outer cylinder 6 and the outer periphery of the inner cylinder 5. It is formed so as to communicate with the collar release gap 10.

One or more (two in the illustrated example) seal ring grooves 13 are provided on the outer periphery of the inner cylindrical body 5, and a pipe P (see FIG. 4), an elastic seal ring 2 made of an O-ring or the like closely fitted to the inner peripheral surface. When two elastic seal rings 2 are provided side by side in and out in the axial direction, the outer diameter of the inner elastic seal ring 2a is set to be larger than the outer diameter of the outer elastic seal ring 2b. Accordingly, the degree of adhesion between the innermost elastic seal ring 2a and the inner peripheral surface of the pipe P can be higher than the degree of adhesion between the outer elastic seal ring 2b and the inner peripheral surface of the pipe P. It is possible to more effectively prevent the liquid in the pipe P from leaking from between the inner peripheral face of the pipe P and the outer peripheral face of the inner cylinder 5. The cross-sectional shape of the seal ring groove 13 is formed in a rectangular shape as shown in FIG. 6, or as shown in FIG. In order to further enhance the sealing effect, a seal ring groove 13 having a sectional shape as shown in FIG. 7 is more preferable.

A collar 14 having an outer diameter smaller than the inner diameter of the outer cylindrical body holding boss 9 is provided on the inner peripheral side of the inner cylindrical body 5 at the inner end side of the elastic seal ring 2a and the open end of the outer cylindrical body holding boss 9. Are slidably fitted in the axial direction on the outer periphery of the inner cylinder 5 so as to be located between the inner cylinder 5 and the inner cylinder 5. And the biting teeth 3a biting into the outer peripheral surface of the pipe P to be inserted into the outer periphery of the collar 14
The lock ring 3 having a diameter that can be expanded and contracted is temporarily held in an expanded state until the pipe P is inserted. The elastic seal ring 2, the collar 14, and the lock ring 3 can be easily fitted by screwing the outer cylinder 6 to the outer cylinder holding boss 9 of the joint main body 1 before screwing the same. After fitting the elastic seal ring 2, the collar 14, and the lock ring 3, the outer cylinder 6
It is screwed and connected to the outer cylinder holding boss 9 of the joint body 1.

The female screw 8 at the other end of the outer cylinder 6 has a cylindrical stopper 1 having an inner diameter through which a pipe P to be inserted can be inserted, and having a male screw 15 cut on the outer periphery.
The sixth male screw 15 is screwed forward and backward in the axial direction. The lock ring 3 is disposed so as to be located on an extension of the tip 16 a of the stopper 16. A flange portion 17 is formed to protrude from the outer end of the stopper 16.

Next, the manner of use of the plug-in type pipe joint shown in FIG. 2 will be described with reference to FIGS. As shown in FIG. 4, one end of a resin pipe P such as a polybutene pipe is inserted into the pipe insertion gap 12 of the pipe joint. Then the pipe P
An elastic seal ring 2 is in close contact with the inner peripheral surface of the tube P in a compressed state, and the elastic seal ring 2 seals between the inner peripheral surface of the pipe P and the outer peripheral surface of the inner cylinder 5. At the same time, the collar 14 is pushed into the collar release gap 10 by one end of the pipe P to be inserted, and at the same time, the biting teeth 3 a of the lock ring 3 lightly bite into the outer peripheral surface of the pipe P.

Next, as shown in FIG. 5, when the pipe P is pulled in the withdrawing direction a, the outer periphery of the lock ring 3 which moves in the same direction together with the pipe P is constricted by the outer cylindrical body 6 and is tapered. When the lock ring 3 comes into contact with the surface 19, the diameter of the lock ring 3 is reduced, and the bite teeth 3 a bite into the outer peripheral surface of the pipe P. This can prevent the pipe P from coming out of the pipe insertion gap 12 of the joint body 1.

When the pipe P is detached from the joint body 1, as shown in FIG. 6, the stopper 16 is screwed forward until the flange 17 comes into contact with the other end surface of the outer cylinder 6. The lock ring 3 is pushed by the distal end portion 16a to be separated from the pressing surface 19 of the outer cylindrical body 6, and the biting teeth 3a are prevented from biting into the outer peripheral surface of the tube P. It can be removed from the insertion gap 12. A male screw 21 is cut on the outer periphery of the other end of the joint body 1 in the axial direction, and a water faucet or an elbow made of metal and having a female screw is screwed into the male screw 21.

[0021]

As described above, according to the present invention,
One end of the tube can be easily and quickly inserted in a seal and retaining shape, and an elastic seal ring and
The lock ring and the collar can be easily incorporated, and the assemblability is excellent.

[Brief description of the drawings]

FIG. 1 is an exploded cross-sectional view of a plug-in type pipe joint according to an embodiment.

FIG. 2 is a partially cutaway sectional view of the plug-in type pipe joint in an assembled state.

FIG. 3 is an enlarged sectional view of a fitting portion of an elastic seal ring of the plug-in type pipe joint.

FIG. 4 is a partially cutaway sectional view of a state immediately after a pipe is inserted into the plug-in type pipe joint of FIG. 1;

FIG. 5 is a partially cutaway cross-sectional view showing a state where a pipe has been completely inserted.

FIG. 6 is a partially cutaway sectional view showing a state in which a pipe can be extracted.

FIG. 7 is a sectional view showing another embodiment corresponding to FIG. 3;

[Explanation of symbols]

 P pipe 1 Joint body 2 Elastic seal ring 3 Lock ring 3a Biting teeth 5 Inner cylinder 6 Outer cylinder 7,8 Female screw of outer cylinder 9 Outer cylinder holding boss 10 Gap for releasing color 11 Male screw of outer cylinder holding boss 12 Pipe insertion gap 14 Collar 15 Stopper external thread 16 Stopper 19 Pressing surface

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hideo Hirabayashi F-term (reference) 3J106 AB01 BA01 BB01 BC04 BD01 BE12 BE13 BE29 BE33 CA03 EA03 EB05 EC01 ED14 EE04 EF04 EF05

Claims (3)

[Claims] 1. A tubular joint body, an elastic seal ring,
The joint body has an inner and outer double cylinder at one end in the axial direction, of which the inner cylinder is formed integrally with the joint body, and the outer cylinder is separate from the joint body. It is formed with a female thread at one end inner circumference, and an outer cylinder holding boss protrudes concentrically with the inner cylinder at the outer periphery of the root of the inner cylinder of the joint body with a collar escape gap. Then, a male thread is cut around the outer circumference of the outer cylinder holding boss, and the female screw of the outer cylinder is screwed and connected to the male thread to connect the collar escape gap between the outer cylinder and the inner cylinder. An insertion gap is formed, a seal ring groove is formed on the outer periphery of the inner cylindrical body, and the elastic seal ring that is in close contact with the inner peripheral surface of the pipe inserted into the pipe insertion gap is fitted into the seal ring groove. The inner diameter of the outer cylinder holding boss. The collar having a smaller outer diameter is axially disposed on the outer periphery of the inner cylinder so that the collar is located between the elastic seal ring on the outer periphery of the inner cylinder and the open end of the outer cylinder holding boss. The lock ring is slidably fitted, and the lock ring, which has a biting tooth that bites into the outer peripheral surface of the pipe, is temporarily fixed and held in an expanded state on the outer periphery of the collar. The inner peripheral surface of the body is formed with a constricted tapered pressing surface for applying a force in the diameter reducing direction to the lock ring when the inserted tube moves in the exit direction. Plug-in type pipe fitting. 2. A cylindrical stopper having an inner diameter through which a pipe to be inserted can be inserted, and having a male thread on an outer periphery, wherein the stopper is cut into the inner periphery at the other end of the outer cylinder. 2. The plug-in type pipe joint according to claim 1, wherein said lock ring is disposed so as to be able to advance and retreat in an axial direction so as to be movable in and out of a female screw. 3. An elastic seal ring, wherein two elastic seal rings are arranged inside and outside in the axial direction, and the outer diameter of the inner inner elastic seal ring is set to be larger than the outer diameter of the outer elastic seal ring. Item 3. The plug-in type pipe joint according to item 1 or 2.