JP3163375B2 - Flexible fittings - 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 type 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 pipe 02 side by an annular groove 06 provided on the outer peripheral surface thereof, and has a joining projection on the short pipe 02 side by its bottom face 07. It is in contact with the inner surface 08 of the part 03. Therefore, even when the connected pipe 09 may move in the axial direction, the packing ring 05 is formed with 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.

[0004] Therefore, the packing ring 05 can reliably absorb the displacement or movement of the connected pipe 09 while maintaining the watertightness of the connecting portion based on its elasticity.

[0005]

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 has already been formed in the packing ring 05, and the distance between the joining projection 03 and the locking projection 04 is predetermined.
This is because it is necessary to simultaneously perform accurate positioning and welding of the locking projection 04 within a limited space in the short pipe 02, 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 has been made possible to adjust the distance between the locking projection and the joining projection, and to obtain a sufficient packing ring holding force. The purpose is.

[0008]

In order to achieve the above-mentioned object, a flexible pipe joint according to the present invention has a cylindrical connection having an inner diameter corresponding to the thickness of a packing ring larger than the outer diameter of a pipe. A locking projection having an internal thread is formed on the inner peripheral portion of the pipe, and a packing ring having an annular groove on the outer peripheral surface and an annular tongue at one end is provided so that the annular groove is fitted to the locking projection. And a holder having a holding groove surrounding the outer circumference of the pipe and a predetermined bolt insertion hole is disposed so that the annular tongue of the packing ring is fitted into the holding groove, and the bolt is inserted. A bolt is screwed into the female screw of the locking projection via a hole.

[0009]

The packing ring made of an elastic material has its annular tongue gripped by the holding groove of the holder and is further sandwiched between the locking projection and the holder. Even if it moves in the axial direction due to the expansion and contraction of the packing ring, the packing ring never follows the piping,
Therefore, no misalignment with respect to the connecting pipe occurs. In this pipe joint, part of the packing ring
Since the proper tightening force adjusted by each bolt is applied, even if the position of the locking projection is slightly shifted, part of this packing ring will have no space in the space between the locking projection and the holder. , And is held with a uniform force.

[0010]

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

FIG. 1 shows an assembling diagram of a pipe joint 1. A cylindrical connecting pipe having an inner diameter larger than the outer diameter of the pipe 2 to be connected, corresponding to the radial thickness of the packing ring 3 is shown. 4 has a locking projection 5 welded to the inner peripheral surface near the end. The locking projection 5 is welded to the inner peripheral surface of the connection pipe 4 in a divided manner or as an integral ring, and female threads 6 are threaded at predetermined intervals.

3 is a packing ring made of an elastic material,
An annular groove 7 is formed on a part of the outer peripheral surface so that the engagement projection 5 is fitted when the attachment pipe 5 is mounted on the connection pipe 4, and an annular tongue 8 is provided at one end. .

The holder 9 is in the form of a split ring as shown in FIG. 2, and has bolt insertion holes 10 formed at predetermined intervals. Further, a gripping groove 11 is formed radially inward of each bolt insertion hole 10 so as to penetrate both sides, and the annular tongue 8 of the packing ring 3 substantially matches the cross-sectional shape of the gripping groove 11. I have. 1
A general bolt 2 has a head 13 and a male screw 14.

When assembling the pipe joint 1, a ring-shaped packing ring 3 is fitted into the inner peripheral surface of the connecting pipe 4 in an elastically bent state. At this time, the annular groove 7 of the packing ring 3 is fitted to the locking projection 5 to restrict left and right movement.

Next, the holding groove 9 of the holder 9 is fitted to the annular tongue 8 of the packing ring 3, and each of the ring-shaped holders 9 is positioned in front of the locking projection 5. The pipe joint 1 is assembled by inserting the bolt 12 from the insertion hole 10 and screwing the male screw 14 of the bolt 12 into the female screw 6 of the locking projection 5.

FIG. 3 shows the assembled pipe joint 1, in which the annular tongue 8 of the packing ring 3 is held by a gripping groove 11, and the vicinity of the annular tongue 8 is held by a holder 9 and a locking projection 5. It will be pinched.

The holding force of the packing ring 3 is
2, which is determined by the position of the head 13 of the bolt abutting on the outer surface of the holder 9 and the position of the male screw 14 of the bolt screwed into the locking projection 5.

That is, the packing ring 3 made of an elastic material
Since the annular tongue 8 is gripped by the holding groove 11 of the holder 9 and is further clamped between the locking projection 5 and the holder 9, it is necessary to remove or attach the pipe 2 or to expand and contract itself. The packing ring 3 never follows the pipe 2 even if it moves axially due to
Is not displaced with respect to.

In this pipe joint 1, the packing ring 3
Since a proper tightening force adjusted by each bolt 12 is applied to a part of the packing ring 3, even if the position of the locking protrusion 5 is slightly shifted, a part of the packing ring 3 is locked. It is held in the space between the part 5 and the holder 9 with no gap and with a uniform force.

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 gist of the invention, the invention is not limited thereto. included.

[0021]

According to the pipe joint of the present invention, a part of the packing ring is provided with an appropriate tightening force adjusted by each bolt, so that, for example, the position of the welded locking projection is slightly shifted. Even if it does, a part of this packing ring is uniformly held in the space between the locking projection and the holder without any gap, thereby preventing the packing ring from being damaged or dropped. In addition, the packing ring is more completely prevented from falling off by the holding groove of the holder.

[0022]

[Brief description of the drawings]

FIG. 1 is an assembly view of the present invention, and is a cross-sectional view near an end of a connection pipe.

FIG. 2 is a perspective view of the holder.

FIG. 3 is a cross-sectional view of the vicinity of an end of the connecting pipe, which is a view of a completed assembly of FIG. 1;

FIG. 4 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 Connecting pipe 5 Locking projection 6 Female screw 7 Annular groove 8 Annular tongue 9 Retainer 10 Bolt insertion hole 11 Gripping groove 12 Bolt 13 Bolt head 14 Male screw 15 Retention Outer surface of the tool

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 21/00-27/12 F16L 17/00

Claims (2)

(57) [Claims] An engaging projection having a female thread is formed on an inner peripheral portion of 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 annular outer circumferential surface is formed on the outer peripheral surface. A holder having a groove having an annular tongue at one end thereof so that the annular groove is fitted to the locking projection, and further having a holding groove surrounding the outer periphery of the pipe and a predetermined bolt insertion hole. Is disposed so that the annular tongue of the packing ring is fitted in the grip groove, and a bolt is screwed into the female screw of the locking projection through the bolt insertion hole. Flexible pipe joint. 2. The holding tool has a split ring shape, and a plurality of bolt insertion holes are formed at predetermined intervals.
A flexible pipe joint according to claim 1.