JP3182477B2 - Flexible pipe joint and method of manufacturing flexible pipe joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible pipe joint capable of absorbing displacement or vibration such as expansion and contraction, rotation, and the like at a connecting portion of a pipe and maintaining watertightness at that time.

[0002]

2. Description of the Related Art For example, a flexible pipe joint of this kind disclosed in Japanese Utility Model Publication No. 4-29184 has a structure as shown in FIG. This flexible fitting 01
A cylindrical short tube 02, an annular joining protrusion 03 welded to the outer end surface of the short tube 02, and an annular locking protrusion 04 welded to the inner peripheral surface of the short tube 02 near the joining protrusion 03. And this short tube 02
And a packing ring 05 mounted inside the. In this case, the packing ring 05 engages with the locking projection 04 on the short tube 02 side with an annular groove 06 provided on the outer peripheral surface thereof, and has the bottom surface 07 of the joining projection 03 on the short tube 02 side. It is in contact with the inner surface 08. Therefore,
Even if the connected pipe 09 may move in the axial direction, the packing ring 05 is located between the joining projection 03 and the locking projection 04 projecting at right angles to the axis of the short pipe 02. And is securely held in the short tube 02, so that the mounting position does not shift at all. Therefore, the packing ring 05 can reliably absorb the displacement or movement of the connected pipe 09 while maintaining the watertightness of the connection portion based on the elasticity.

[0003]

However, when assembling this known pipe joint 01, the locking projection 04 is inserted into the short pipe 02.
Mounting is actually a rather cumbersome task. This is because the annular groove 06 is already formed in the packing 05, the distance between the joining protrusion 03 and the locking protrusion 04 is predetermined, and when the locking protrusion 04 is attached, the short pipe 0
This is because it is necessary to simultaneously perform the accurate positioning and welding of the locking projections 04 within the limited space within 2, and this requires a considerably skilled and complicated technique.

If a part of the packing ring is not correctly fitted in the space between the joining projection 03 and the locking projection 04, the displacement of the connected pipe 09 may damage the packing ring, There have been reports of the danger of falling off due to the use of this.

Accordingly, the present invention has been made in view of such a problem, and it is possible to adjust the distance between the locking projection and the joining projection by omitting welding of the locking projection of the short pipe. Further, it is intended to simplify the assembling work of the pipe joint.

[0006]

In order to achieve the above object, a flexible pipe joint according to the present invention has a cylindrical connecting pipe having an inner diameter larger than the outer diameter of the pipe, corresponding to the thickness of the packing ring. And a contact edge formed at an end of the connection pipe and having bolt insertion holes at predetermined intervals, and a packing ring made of an elastic material that abuts on an outer peripheral surface of the pipe and an inner surface of the contact edge. A flexible structure in which a part of the packing ring is pressed against a contact edge with a predetermined tightening force by a bolt penetrating the bolt insertion hole and a part of the packing ring and a nut material screwed thereto. a sex tube fittings, Pakkinri
An annular groove is formed on the piping side of the nut,
It is characterized by the fact that it is possible to insert material .

[0007] In order to achieve the above object, the flexible pipe joint of the present invention is designed so that the thickness of the packing ring is smaller than the outer diameter of the pipe.
A cylindrical connecting pipe having a correspondingly large inner diameter, and a connecting pipe
Formed at the end of the connector and has bolt insertion holes at predetermined intervals
Abuts against the contact edge, the outer peripheral surface of the pipe and the inner surface of the contact edge
And a packing ring made of an elastic material.
Bolts that pass through the insertion holes and part of the packing ring
The nut material that is screwed together with the
To the contact edge with the specified tightening force.
A flexible pipe joint characterized in that the nut member has a plurality of female threads at positions corresponding to the bolt insertion holes at the contact edges.

[0008] In order to achieve the above object, the flexible pipe joint of the present invention has a thickness of the packing ring which is larger than the outer diameter of the pipe.
A cylindrical connecting pipe having a correspondingly large inner diameter, and a connecting pipe
Formed at the end of the connector and has bolt insertion holes at predetermined intervals
Abuts against the contact edge, the outer peripheral surface of the pipe and the inner surface of the contact edge
And a packing ring made of an elastic material.
Bolts that pass through the insertion holes and part of the packing ring
The nut material that is screwed together with the
To the contact edge with the specified tightening force.
A flexible pipe joint, wherein a head of a bolt is buried in a packing ring, and a male screw portion of the bolt protrudes from the packing ring.

Further, the method for manufacturing a flexible pipe joint according to the present invention comprises:
A connecting ring having an abutment edge portion in which a bolt insertion hole is formed in advance is provided with a packing ring having an annular groove on the pipe side, that is, on the inner peripheral side, and penetrates through the bolt insertion hole into the annular groove of the packing by a drill. After forming a through hole, a nut material is inserted into the annular groove from the inner peripheral side of the packing ring, and a part of the packing ring is fixed to a predetermined tightening force by the bolt and the nut material inserted into the bolt insertion hole. It is characterized in that it is pressure-bonded to the abutting edge.

[0010]

[Function] The packing ring made of an elastic material is held between the inner surface of the contact edge and the nut material with a sufficient holding force. Even when moved in the axial direction, the packing ring never follows the pipe and therefore does not shift with respect to the connecting pipe. In this pipe joint, a uniform tightening force adjusted by a nut material and a bolt is applied to a part of the packing ring, and the packing ring is crimped to a contact edge portion (claims 1 to 3 ).

In the method for manufacturing a flexible pipe joint according to the present invention, a through hole for inserting a bolt into the packing ring is formed after the packing ring is provided in the connecting pipe. This packing is applicable even if the bolt insertion hole of
4 ).

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. The pipe joint 1 has a cylindrical connecting pipe 4 having an inner diameter larger than the outer diameter of the pipe 2 to be connected in accordance with the radial thickness of the packing ring 3, and an inner diameter slightly larger than the outer diameter of the pipe 2. And a packing ring 3 made of an elastic material interposed between the outer peripheral surface of the pipe 2 and the inner peripheral surface of the connection pipe 4.

More specifically, a bolt insertion hole 18 is formed in the contacting edge portion 7 at predetermined intervals around the circumference, and a bolt 9 is inserted into the bolt insertion hole 18 from the outer surface 6 side of the packing ring. The bolt 3 is inserted so as to penetrate therethrough, and the male screw 12 of this bolt is screwed into the female screw 11 of the nut material 5 inside the packing ring 3.

When the packing ring 3 is mounted, the packing ring 3 made of an elastic material is held between the inner surface 8 of the contact edge 7 and the nut member 5 with a sufficient holding force. The packing ring 3 is never driven by the pipe 2 and is therefore displaced with respect to the connecting pipe 4 even if it moves in the axial direction during installation and removal of the pipe 2 or due to expansion and contraction of the pipe 2 itself. There is nothing.

Therefore, the packing ring 3 is
, While maintaining the watertightness of the connection portion. In this pipe joint 1, a part of the packing ring 3 is adjusted by the nut member 5 and the bolt 9 so that a uniform tightening force is applied at the time of mounting.

FIGS. 2 to 4 show a manufacturing procedure of the pipe joint 1. First, as shown in FIG. 2, the inner surface 8 of the contact edge 7 and the inner surface 15 of the connecting pipe 4 are formed with an annular shape. The packing ring 3 is installed with elastic deformation.

The packing ring 3 has an annular groove 16 formed on the side facing the pipe, that is, on the inner peripheral side. Due to the presence of the annular groove 16, the packing ring 3 has an annular flange portion 17 facing inward. are doing.

When the interior of the packing ring 3 is completed, as shown in FIG. 3, a drill 14 is inserted while rotating from a plurality of bolt insertion holes 18 formed at a predetermined interval in the abutting edge 7, and the bolt 14 is inserted. A bolt insertion hole 18 is formed as a through hole communicating from the insertion hole 18 to the annular groove 16.

Thereafter, a predetermined number of nut members 5 having female threads 11 at positions corresponding to the bolt insertion holes 18 as shown in FIG. 5 are fitted into the annular grooves 16 as shown in FIG. Further, the bolt 9 is inserted from the bolt insertion hole 18.

When the male screw of the bolt 9 is screwed into the female screw 11 of the nut member 5, the head portion of the bolt 9 and the nut member 5 cause the annular flange portion 17 of the packing ring 3 as shown in FIG. Is pressed against the contact edge. in this case,
Since the screwing force of each bolt 9 can be adjusted, even if the thickness of the annular flange portion 17 of the packing ring 3 is slightly varied, uniform tightening adjustment can be performed afterward.

As shown in FIG. 2, the annular flange portion 17 of the packing ring 3 projects slightly obliquely in a free state.
A force is generated to press the outer surface 13 of the packing ring 3 against the inner surface 15 of the connection pipe 4, and more secure mounting of the packing ring 3 can be achieved.

FIGS. 6 and 7 show a second embodiment of the present invention. When the packing ring 3 is manufactured, the head portion 10 of the bolt is left inside the packing ring 3 so that the packing ring 3 is removed. It is molded.

A predetermined number of male threads 12 of bolts 9 protrude from the packing ring 3, and the bolts 9 correspond to the positions of the bolt insertion holes 18 of the contact edge 7 formed in advance. Therefore, the annular packing ring 3 is mounted on the inner surface 8 of the contact edge 7 and the inner surface 15 of the connecting pipe 4 with elastic deformation, and at the same time, the bolt insertion hole 1 is formed.
A part of the packing ring 3 is pressed against the inner surface 8 of the contact edge 7 by inserting a bolt 9 into the nut 8 and screwing it into the nut member 5.

Although the embodiments have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and even if there are changes and additions without departing from the scope of the present invention, the present invention is not limited thereto. included.

For example, in the embodiment, an arc-shaped nut material or an ordinary nut is used, but a half-ring-shaped one or a ring-shaped one may be used.

[0027]

According to the present invention, since all the mounting of the packing ring is performed by using bolts and nuts, the pressure contact force of the packing ring can be appropriately adjusted, and the pressure contact force can be made uniform and the balance of the pressure contact force is lost depending on the used terrain. You can do it. Also, replacement of the packing ring and the like can be simplified.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the vicinity of an end of a connection pipe according to a first embodiment.

FIG. 2 is a sectional view of the connecting pipe of FIG. 1 at the time of assembly.

FIG. 3 is a sectional view of the connecting pipe of FIG. 1 at the time of assembly.

4 is a sectional view of the connecting pipe of FIG. 1 at the time of assembly.

FIG. 5 is a perspective view of a nut material.

FIG. 6 is a cross-sectional view of the vicinity of an end of a connection pipe according to a second embodiment.

FIG. 7 is a sectional view of the connecting pipe of FIG. 6 at the time of assembly.

FIG. 8 is a sectional view of a conventional pipe joint.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Flexible pipe joint 2 Piping 3 Packing ring 4 Connection pipe 5 Nut material 6 Outer surface of abutting edge 7 Abutment edge 8 Inner surface of abutting edge 9 Bolt 10 Head 11 Female screw 12 Male screw 13 Packing ring Outer surface 14 Drill 15 Inner surface of connecting pipe 16 Annular groove 17 Annular flange 18 Bolt insertion hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-26384 (JP, A) Japanese Utility Model Showa 59-132988 (JP, U) Japanese Utility Model Showa 61-59987 (JP, U) Japanese Utility Model Showa 55- 82588 (JP, U) (58) Fields studied (Int. Cl. ⁷ , DB name) F16L 21/00-21/08 F16L 17/00

Claims (4)

(57) [Claims] 1. A cylindrical connecting pipe having an inner diameter larger than an outer diameter of a pipe in accordance with a thickness of a packing ring, and an abutment formed at an end of the connecting pipe and having bolt insertion holes at predetermined intervals. A bolt made of an elastic material, which is in contact with the outer peripheral surface of the pipe and the inner surface of the contacting edge, and penetrating through the bolt insertion hole and a part of the packing ring; and a nut screwed with the bolt. the wood, so as to crimp with a predetermined clamping force a portion of the packing ring abutment edge
A the flexible properties tube joints, pipe side of the packing ring,
That is, an annular groove is formed on the inner peripheral side so that nut material can be inserted.
A flexible pipe joint characterized by the following . 2. The thickness of the packing ring rather than the outer diameter of the pipe.
A cylindrical connecting tube having a large inner diameter corresponding to
Formed at the end of the tube and has bolt insertion holes at predetermined intervals
Abuts the outer peripheral surface of the pipe and the inner surface of the abutting edge
And a packing ring made of an elastic material.
And a bolt that penetrates through the insertion hole and part of the packing ring.
With the nut material screwed with it, the packing ring
Crimping a part against the contact edge with the specified tightening force
Flexible joint, wherein the nut member has a plurality of female threads at positions corresponding to the bolt insertion holes at the contact edge.
A flexible pipe joint characterized by the above-mentioned . 3. The thickness of the packing ring rather than the outer diameter of the pipe.
A cylindrical connecting tube having a large inner diameter corresponding to
Formed at the end of the tube and has bolt insertion holes at predetermined intervals
Abuts the outer peripheral surface of the pipe and the inner surface of the abutting edge
And a packing ring made of an elastic material.
And a bolt that penetrates through the insertion hole and part of the packing ring.
With the nut material screwed with it, the packing ring
Crimping a part against the contact edge with the specified tightening force
Was a flexible pipe joint, the head of the bolt packing ring is embedded, flexible pipe joint portion of the external thread, characterized in that it is projected from the packing ring. 4. A packing pipe having an annular groove on a pipe side, that is, an inner peripheral side is provided inside a connection pipe having a contact edge portion in which a bolt insertion hole is formed in advance, and packing is performed by a drill through the bolt insertion hole. A through hole is formed in the annular groove, and then a nut material is inserted into the annular groove from the inner peripheral side of the packing ring, and a part of the packing ring is formed by the bolt and the nut material inserted into the bolt insertion hole. And a method of manufacturing a flexible pipe joint in which a predetermined pressure is applied to a contact edge.