JP2000320750A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint capable of obtaining a satisfactory sealing property without damaging a pipe. SOLUTION: This pipe joint is provided with a joint main body 3 having a connection port 2 consisting of a peripheral stepped part 5, a smooth inner peripheral face 7 extending in parallel with a pipe axis 6 from an outer end of the peripheral stepped part 5, a tapered face 8 whose diameter is expanded toward the outside from an outer end of the smooth inner peripheral face 7, and a female screw part 9 extending in parallel with the pipe axis 6 from an outer end of the tapered face 8, an in-core 11 having a cylindrical body 17 which is fitted into a connection end 15 of a connection pipe 14 and in which a latching part 16 latching with an inner face of the connection end 15 is formed and an outer collar part 18 provided continuously at one end of the cylindrical body 17, a seal ring 19 provided between the connection pipe 14 and the smooth inner peripheral face 7 of the joint main body 3, a C ring 21 provided between the connection pipe 14 and the tapered face 8 of the joint main body 3, and a screw ring for locking 22 which has a male screw part 23 screw-fitted in the female screw part 9 of the joint main body 3 and is provided between the female screw part 9 and the connection pipe 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a pipe joint.

[0002]

2. Description of the Related Art In a pipe joint used for a pipe made of a synthetic resin material, conventionally, a hook claw of a fastening member provided on a joint body is provided for a pipe end (connection end) inserted into a connection port of the joint body. Was fixed so that it could be bitten from the outside.

[0003]

However, in the above-described conventional pipe joint, the outer diameter of the pipe end is large, and the outer surface of the pipe end may be damaged due to the fastening by the hook. In addition, since the seal between the joint body and the pipe end is provided on the outer surface of the pipe end, there is a problem in that the sealability is impaired by the outer surface flaw of the pipe end.

[0004] Therefore, an object of the present invention is to provide a pipe joint which is compact as a whole and can obtain good sealing properties.

[0005]

In order to achieve the above-mentioned object, a pipe joint according to the present invention comprises a circumferential stepped portion, a smooth inner peripheral surface extending from an outer end of the circumferential stepped portion in parallel with a pipe axis, A connection main body having a tapered surface that expands outward from the outer end of the smooth inner peripheral surface and a female screw portion extending outward from the outer end of the tapered surface; connection of connection piping A tubular body having a hook portion fitted into the end and hooked to the inner surface of the connection end, and an incore having an outer flange portion connected to one end of the tubular body; A seal ring interposed between the joint pipe and the smooth inner peripheral surface of the joint body; a C ring interposed between the connection pipe and the tapered surface of the joint body; A locking screw ring having a mating male screw portion and being interposed between the female screw portion and the connection pipe. .

In another aspect of the invention, a circumferential step, a smooth inner peripheral surface extending from an outer end of the circumferential step parallel to the tube axis, and a female screw extending outward from an outer end of the smooth inner peripheral surface. A joint body having a connection port consisting of a part; fitting into a connection end of a connection pipe;
And a cylindrical body having a hooking portion formed on the inner surface of the connection end, and an incore having an outer flange connected to one end of the cylindrical body; and a smooth inner periphery of the connection pipe and the joint body. A seal ring interposed between the joint body and the outer ring; a C-ring having an outer tapered surface that decreases in diameter outwardly; and a female screw having a male screw portion screwed into a female screw portion of the joint body. A locking screw ring interposed between the screw portion and the connection pipe, and having a tip portion formed such that an inner tapered surface abutting on the outer tapered surface of the C-ring is reduced in diameter outward. ;

In another aspect of the present invention, a circumferential step portion, a smooth inner peripheral surface extending parallel to the tube axis from an outer end of the circumferential step portion, and a diameter increasing outward from an outer end of the smooth inner peripheral surface. Tapered surface, and
A joint body having a connection port formed of a female screw portion extending outward from an outer end of the tapered surface; and a hook portion fitted into the connection end of the connection pipe and hooked on the inner surface of the connection end. A tubular body, and an incore having an outer flange portion connected to one end of the tubular body; a seal ring interposed between the connection pipe and a smooth inner peripheral surface of the joint body; A tip having an outer tapered surface with a slit abutting from the inside to the tapered surface of the main body, and a male screw portion screwed into the female screw portion of the joint main body, between the female screw portion and the connection pipe. And a lock screw ring interposed in the lock member.

In each of the above-mentioned inventions, the hooking portion may be a leaf spring-shaped hooking piece formed by cutting and raising the cylindrical body in the outer peripheral direction. Further, a grater-shaped projection formed in the cylindrical body in an outwardly projecting shape may be used. Further, it may be a group of many small projections formed on the outer peripheral surface of the cylindrical body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments of the present invention.

FIG. 1 is a sectional view of a connection port 2 of a pipe joint 1, and FIG.
Is a joint body formed in a cylindrical shape (see FIG. 2).
A circumferential stepped portion 5 made of cast iron, stainless steel, or bronze, and formed by a circumferentially projecting piece 4 protruding inwardly in a radial direction.
A smooth inner peripheral surface 7 extending from the outer end of the peripheral stepped portion 5 in parallel with the tube axis 6, a tapered surface 8 expanding outward from the outer end of the smooth inner peripheral surface 7, It has a connection port 2 consisting of a female screw portion 9 extending from the outer end of the tapered surface 8 in parallel with the pipe shaft 6. The taper angle of the tapered surface 8 is
10 ° to 35 ° is preferred.

In FIGS. 1 and 3 (A) and 3 (B), reference numeral 11 denotes an incore, which is made of, for example, stainless steel.
A cylindrical body 17 formed with a hooking portion 16 that fits inside the connecting end 15 and is hooked on the inner surface of the connecting end 15, and an outer flange portion 18 provided at one end of the cylindrical body 17. have. The hooking portion 16 is a leaf spring-like hooking piece formed by cutting and raising the cylindrical body 17 of the in-core 11 toward the outer peripheral direction, and the hooking piece 16 is
It is arranged at a position deviated outward by ε from the position of a C ring 21 described later. Reference numeral 19 denotes a seal ring (such as an O-ring or an elliptical cross-section ring) interposed between the connection pipe 14 and the smooth inner peripheral surface 7 of the joint body 3, and is made of, for example, SBR.

1 and 4, reference numeral 20 denotes a backup ring interposed between the seal ring 19 and the outer flange portion 18 of the in-core 11, and is made of, for example, polyethylene. In FIGS. 1 and 5, reference numeral 21 denotes a C ring interposed between the connection pipe 14 and the tapered surface 8 of the joint body 3, which is made of, for example, polyacetal and has a partially cut-out portion. An outer ring 211 is formed in a tapered shape. 1 and FIGS. 6 (A) and 6 (B), reference numeral 22 denotes the joint body 3.
A locking screw ring having a male screw portion 23 screwed into the female screw portion 9 and interposed between the female screw portion 9 and the connection pipe 14, and is made of, for example, modified PPO (glass fiber reinforced). . The above-described backup ring 20 may be formed integrally with the outer flange 18 of the in-core 11.

A description will be given of a pipe connection operation using the pipe joint 1 having such a configuration. For example, an in-core 11, a backup ring 20, a seal ring 19, a C-ring 21 and a lock After the screw ring 22 is fitted, the connection end 15 is inserted into the joint body 3.
Next, the locking screw ring 22 is screwed into the female screw portion 9 of the joint body 3 and screwed. The sealing ring 19 becomes a backup ring by screwing and fastening the locking screw ring 22.
Since the joint body 3 and the connection pipe 14 are firmly sealed because they are sandwiched and compressed between the C ring 20 and the C ring 21.

On the other hand, since the diameter of the C ring 21 is reduced by the tapered surface 8 of the joint body 3, the connection end 15 of the connection pipe 14 is tightened.
The tip of the hook 16 of the eleventh bites, and the connection pipe 14 is prevented from coming off. Since the outer flange portion 18 of the in-core 11 is clamped between the backup ring 20 and the circumferential step portion 5 of the joint body 3 by screwing and fastening the locking screw ring 22, the connection pipe 14 The joint body 3 is connected to the joint body 3 in a strong retaining state. Since the connecting end 15 is reduced in diameter by ε from the hooking piece 16 by the C-ring 21, the hooking piece 16 bites more remarkably due to the movement of the connecting pipe 14 in the removal direction. Because
The retaining effect is improved.

In such a connection state, the seal ring 19
Thereby, a seal is provided on the outer surface of the connection pipe 14. Therefore, the higher the pressure in the connection pipe 14, the more
The degree of adhesion of the seal ring 19 is improved, and high sealing performance can be secured. For this seal configuration, the hooking piece 16 of the incore 11 is hooked on the inner surface of the connection pipe 14, so that
The seal configuration and the latching configuration are independently formed without being affected by each other, and a high sealing state can be ensured under a stable latching state. In addition,
As for the sealing structure, by screwing / fastening the lock screw ring 22, an average compression ratio of approximately 20% and a minimum compression ratio of 15% or more are secured to absorb errors in the compression ratio of the seal ring 19 caused by pipe tolerance. Is preferred.

Further, by appropriately selecting the screw pitch between the female screw portion 9 of the joint body 3 and the male screw portion 23 of the locking screw ring 22, it is possible to adjust the number of screwings and the tightening force. Further, by reducing the height of the screw thread, the outer diameter of the joint main body 3 can be reduced to achieve further compactness. The joint body 3 can be easily formed by, for example, casting a metal material. However, if the joint body 3 can secure a strength enough to withstand the breaking strength of the connection pipe 14 due to an external force such as a pulling force, the synthetic resin material is used. May be used. The form of the joint body 3 may be, for example, an elbow type, a T-shaped type, a cross shape, or a socket type, in addition to the configuration shown in FIG.

FIG. 7 shows another embodiment. In this case,
The hooking portion 16 of the incore 11 is a grater-shaped projection formed on the cylindrical body 17 in an outwardly projecting shape, and in a tightening completed state,
The hook 16 is directly aligned with the position of the C-ring 21, and the tightening force of the C-ring 21 is applied directly to the hook 16, so that the connection end 15 of the connection pipe 14 is The structure is such that the hooking portion 16 can be reliably cut into the inner surface.

FIG. 8 shows another embodiment, in which
The hooking portion 16 of the incore 11 is, for example, a knurling process or the like, and is formed into a group of many small projections formed on the outer peripheral surface of the cylindrical body 17, without flaws on the inner surface of the connection end 15 of the connection pipe 14, By increasing the frictional resistance, a retaining effect can be obtained.

FIG. 9 shows a different embodiment. In this case, the C-ring 27 has an outer tapered surface 12 whose diameter is reduced outwardly, and abuts the outer tapered surface 12 from outside. An inner tapered surface 13 (formed so as to decrease in diameter toward the side) is formed at the distal end of the locking screw ring 28. With such a configuration, when an external force in the pull-out direction acts on the connection pipe 14, the C-ring 27 is further tightened, so that the drop-out preventing effect is remarkable.

FIGS. 10 and 11 show still another embodiment, in which the C-ring 21 in the embodiment shown in FIG. 1 is omitted, and instead, a tip 26 of a locking screw ring 29 is provided.
Slit that abuts tapered surface 8 of joint body 3 from inside
An outer tapered surface 25 with 24 is formed so that the distal end portion 26 is freely deformable in the inner diameter direction, and a male screw portion 23 integrally formed outward from the distal end portion 26 is formed into a joint body 3 of the joint body 3. It is configured to be screwed into the female screw portion 9. With such a configuration, the number of parts is reduced, and workability on site is improved. Note that the tip portion 26 and the male screw portion 23 may be integrally formed, or may be formed separately and joined with an adhesive.

The present invention does not limit the configuration of the latch 16 to the above-described embodiment.
17 can be suitably employed regardless of its shape or configuration as long as it can be hooked to the connection end 15 of the connection pipe 14 by tightening the C-rings 21 and 27. In addition, the present invention does not specify the material of each member constituting the pipe joint 1 in the embodiment, and it goes without saying that the material may be appropriately selected and selected according to the use conditions and the like.

[0022]

According to the first aspect of the present invention, since the seal ring 19 seals the outer surface of the connection pipe 14, the more the pressure in the connection pipe 14 increases, the closer the seal ring 19 becomes. The degree is improved, and high sealing performance can be secured. In addition, the hook 16 of the incore 11 is connected to the connection piping
Since it is hooked on the inner surface of 14, the hooking function and the sealing function are independently formed without being influenced by each other, and always ensure high sealing performance under a stable hooking state Can be. Further, the outer diameter of the joint main body 3 can be reduced, and compactness can be achieved.

According to the second aspect of the present invention, since the outer tapered surface 12 formed on the outer peripheral surface of the C ring 27 is formed so as to be reduced in diameter toward the outside, external force in the pull-out direction is applied to the connection pipe 14. When it works, the C-ring 27 is further tightened, so that the retaining effect is remarkable.

According to the third aspect of the present invention, since the outer tapered surface 25 with the slit 24 abutting from the inside to the tapered surface 8 of the joint body 3 from the inside at the tip end of the locking screw ring 29, the number of parts is reduced. The workability on site is improved.

According to the fourth aspect of the present invention, the plate spring-shaped latching piece formed by cutting and raising the cylindrical body 17 in the outer peripheral direction is used as the latching portion 16. Since the grater-shaped projections formed in the shape of an outer projection on the cylindrical body 17 are used as the hooks 16, furthermore, in the invention according to claim 6, a large number of small projection groups formed on the outer peripheral surface of the cylindrical body 17 Are used as the hooking portions 16, so that the hooking pieces 16 can be easily processed and a reliable hooking state can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention.

FIG. 2 is a sectional view of a joint body.

FIG. 3 is a configuration diagram of an in-core.

FIG. 4 is a sectional view of a backup ring.

FIG. 5 is a sectional view of a C-ring.

FIG. 6 is a configuration diagram of a locking screw ring.

FIG. 7 is a cross-sectional view of a main part showing another embodiment.

FIG. 8 is a sectional view of a main part showing another example of the incore.

FIG. 9 is a cross-sectional view of a principal part showing another embodiment.

FIG. 10 is a sectional view of a main part showing still another embodiment.

FIG. 11 is a perspective view of a locking screw ring.

[Explanation of symbols]

 2 Connection Port 3 Joint Body 5 Circumferential Step 6 Tube Shaft 7 Smooth Inner Surface 8 Tapered Surface 9 Female Thread 11 Incoa 12 Outer Tapered Surface 13 Inner Tapered Surface 14 Connection Piping 15 Connection End 16 Hook 17 Tube 18 Outer flange 19 Seal ring 21 C ring 22 Lock screw ring 23 Male screw 24 Slit 25 Outer tapered surface 26 Tip 27 C ring 28 Lock screw ring 29 Lock screw ring

Claims (6)

[Claims] 1. A peripheral step portion 5, a smooth inner peripheral surface 7 extending from an outer end of the peripheral step portion 5 in parallel with a tube axis 6, and a smooth inner peripheral surface 7.
A tapered surface 8 whose diameter increases outward from the outer end of the
A joint body 3 having a connection port 2 comprising a female thread portion 9 extending outward from an outer end of the tapered surface 8; a fitting body 3 fitted into the connection end 15 of the connection pipe 14 and hung on the inner surface of the connection end 15; A cylindrical body 17 formed with a hooking portion 16 for stopping, and an incore 11 having an outer flange 18 connected to one end of the cylindrical body 17;
A seal ring 19 interposed between the smooth inner peripheral surface 7 of the joint body 3 and a C-ring 21 interposed between the connection pipe 14 and the tapered surface 8 of the joint body 3; Joint body 3
And a locking screw ring 22 provided between the female screw portion 9 and the connection pipe 14 and having a male screw portion 23 screwed with the female screw portion 9 of the present invention. Pipe fittings. 2. A peripheral step portion 5, a smooth inner peripheral surface 7 extending from an outer end of the peripheral step portion 5 in parallel with the tube axis 6, and extending outward from an outer end of the smooth inner peripheral surface 7. A joint body 3 having a connection port 2 composed of a female screw portion 9; and a tubular body formed with a hook portion 16 which fits into the connection end 15 of the connection pipe 14 and is hooked on the inner surface of the connection end 15. And an incore 11 having an outer flange portion 18 connected to one end of the cylindrical body 17; a seal ring interposed between the connection pipe 14 and the smooth inner peripheral surface 7 of the joint body 3;
19; a C-ring 27 having an outer tapered surface 12 whose diameter is reduced outward; and a male thread 23 screwed into the female thread 9 of the joint body 3 and connected to the female thread 9 The outer tapered surface 12 of the C ring 27 interposed between the pipe 14
A locking screw ring 28 having a tip portion formed such that the inner tapered surface 13 abutting on
And a pipe joint characterized by comprising: 3. A peripheral stepped portion 5, a smooth inner peripheral surface 7 extending from an outer end of the peripheral stepped portion 5 in parallel with the tube axis 6, and a smooth inner peripheral surface 7.
A tapered surface 8 whose diameter increases outward from the outer end of the
A joint body 3 having a connection port 2 comprising a female thread portion 9 extending outward from an outer end of the tapered surface 8; a fitting body 3 fitted into the connection end 15 of the connection pipe 14 and hung on the inner surface of the connection end 15; A cylindrical body 17 formed with a hooking portion 16 for stopping, and an incore 11 having an outer flange 18 connected to one end of the cylindrical body 17;
A seal ring 19 interposed between 14 and the smooth inner peripheral surface 7 of the joint body 3; and a tip 26 having an outer tapered surface 25 with a slit 24 that abuts the tapered surface 8 of the joint body 3 from inside. And a locking screw ring 29 having a male screw portion 23 screwed into the female screw portion 9 of the joint main body 3 and interposed between the female screw portion 9 and the connection pipe 14. A pipe joint characterized by the following. 4. The pipe joint according to claim 1, wherein said hooking portion is a leaf spring-shaped hooking piece formed by cutting and raising said cylindrical body toward an outer peripheral direction. 5. The hanging member 16 is a grater-shaped projection formed on the cylindrical body 17 in an outwardly projecting shape.
The described pipe fitting. 6. The pipe joint according to claim 1, wherein said engaging portion comprises a plurality of small projections formed on an outer peripheral surface of said cylindrical body.