JPH11141764A - Split pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To previously prevent connecting failure by arranging bolts composed of a screw part and non-circular part, and mounting rings around the bolts so as to prevent each non-circular part of the bolt from jumping out from each elongate hole of a flange, in a device in which a pipe joint member is fastened by the bolts and nuts. SOLUTION: A housing pipe joint is composed of a pair of half split bodies 2, 2 provided with a pair of flanges 3, 3, bolts 21 penetrated on elongate holes 10 of the flanges 3 and for fastening both flanges 3, 3, and nuts 6. The bolt 21 is composed of a screw part 7, a cylindrical part, non-circular part 8, a head 9, and a seat surface 11, and ring 22 is arranged for press-fitting to the cylindrical part. In the case of use, each bolt 21 is inserted into the elongate hole 10, and the ring 22 is press-fitted to the cylindrical part so as to position a part of the non-circular part 8 in the elongate hole 10 at all times. It is thus possible to prevent the bolt 21 from falling out from the elongate hole 10. The tip end of the screw part 7 side is positioned in the elongate hole 10 at all times, and thereby, it is possible to previously prevent connecting failure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split type pipe joint for connecting pipes by fastening both side flanges of a half-type pipe joint member with bolts and nuts.
A pipe joint for connecting a pipe by tightening a nut in a state in which a bolt having a non-circular section in cross section that functions as a detent for a bolt is inserted into a bolt insertion hole having a non-circular cross section provided in a flange of a pipe joint member. About.

[0002]

2. Description of the Related Art Conventionally, split-type pipe joints, such as a housing-type pipe joint and a flange-type pipe joint, which connect pipes by screwing and connecting the pipe joint members with bolts and nuts, are often used. In this type of pipe joint, a part of the bolt is provided with a non-circular portion in cross section, and a non-circular portion corresponding to the non-circular portion of the bolt is provided at a bolt insertion hole portion of the pipe joint member through which the non-circular portion of the bolt is inserted. A circular portion is provided, and a non-circular portion of the bolt is inserted through the circular portion to prevent co-rotation of the bolt when screwing the nut to the bolt and tightening the bolt, thereby facilitating the fastening of the bolt and the nut.

[0003] As an example of this type of pipe joint, a housing type pipe joint is shown in Figs. The pipe joint 1 extends radially outward from the split surface portion, and has a pair of half bodies 2, 2 as a split type pipe joint member having a pair of flanges 3, 3 facing each other at an interval, and a half. The gasket 4 disposed on the inner peripheral side of the split bodies 2 and 2 passes through the long holes 10 for bolt insertion provided in the flanges 3 and 3 facing each other.
The bolt 5 and the nut 6 are fastened.

[0004] Here, as shown in FIG. 7, the bolt 5 has a screw portion 7 at the tip end, a non-circular portion 8 following the screw portion 7, and a head 9.
The non-circular portion 8 is generally formed from a circular portion and a pair of flat surfaces obtained by cutting off the circular portion, and the screw portion 7 and the non-circular portion 8 are inserted into the elongated holes 10 formed in the flanges 3, 3. It is possible. The elongated holes 10 formed in the flanges 3 are formed as non-circular holes through which the non-circular portions 8 of the bolts 5 can be inserted and which do not allow rotation of the accommodated non-circular portions 8.

[0005] To connect the pipes by the pipe joint 1, pipes 12 and 12 to be connected face each other, a packing 4 is put over both pipe ends, and a half body 2 is formed from the outer peripheral surface of the packing 4. , Cover the flange and insert the bolts into the flanges.
This is done by inserting the bolt 5 into the hole 0 and tightening the nut 6. At this time, by positioning the non-circular portion 8 of the bolt 5 in the direction of the elongated hole 10, the non-circular portion 8 is fitted into the elongated hole 10, and when the nut 6 is fastened to the bolt 5, the non-circular portion 8 rotates around the bolt 5. Stop is made.

However, if the direction of the non-circular portion 8 of the bolt does not match the direction of the elongated hole 10 formed in the flange 3, as shown on the right side of FIG. 11
The nut 6 is tightened in a state in which the nut 6 contacts the flange surface. Such a connection failure can be prevented by the piping operator's attention, but may be overlooked. If the connection is overlooked and used in this state, the direction of the bolt 5 changes due to vibration or other external force. Then, the non-circular portion 8 matches the direction of the long hole 10, and there is a possibility that the bolt is loosened. In such a state, the connection pipe comes off or the sealing performance of the packing 4 decreases, and the function of the pipe joint is impaired.

[0007]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a pipe joint having a structure in which the above-mentioned problems cannot occur in a pipe joint having a structure in which a pipe joint member is fastened by bolts and nuts. And

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention basically provides a means for attaching a ring to a bolt so that a non-circular portion of the bolt does not protrude from a long hole of the flange. Is adopted.

[0009] Specifically, the present invention provides that a joint body disposed at opposite ends of a pipe to be connected is a half of a pair,
In a split type pipe joint in which flanges provided on both sides of a half body are tightened with bolts, the bolts have at least a threaded portion and a non-circular portion, and the non-circular portion has a shorter long hole formed in the flange. Provided is a split-type pipe joint, characterized in that it has a bolt-fitting prevention ring at a position adapted to the dimensions and at a position where the tip of the non-circular portion on the screw portion side does not protrude from the opening edge of the long hole.

[0010] The split type joint according to the present invention has a shape in which a bolt with a ring is mounted in advance so that the threaded end of the non-circular portion of the bolt is always located in the long hole of the pair of flanges of one half. Thus, the connection of the facing pipe ends is performed, so that the above-described disadvantages in the prior art are eliminated. The ring serves to prevent the bolt from falling off the flange. At the piping site, when repairing existing pipes or installing new pipes, disassembly and reassembly of fittings may be repeated, but even in this case, the non-circular part of the bolt is The non-circular portion is always located in the long hole, and the tip of the non-circular portion does not sit on the opening edge of the long hole.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic structure of a split joint 20 according to the present invention is the same as that of the conventional example shown in FIGS. 6 and 7, and the same components are denoted by the same reference numerals and description thereof will be omitted. A bolt 21 for fastening the pair of opposed flanges 3 is
As shown in FIG. 2, a screw portion 7, a subsequent cylindrical portion 7 ′, a non-circular portion 8 in which a part of a cylindrical portion having a diameter slightly larger than the cylindrical portion 7 ′ is a pair of flat surfaces, It comprises a head 9, a seating surface 11 at the tip of the non-circular portion 8, and a C-shaped ring 22 pressed into the cylindrical portion 7 '. The flange 3 of one half 2,
The bolts 21 and 21 are inserted into the long holes 10 and 3, and the rings 22 and 22 are connected to the cylinders of the bolts 21 and 21 such that a part of the non-circular portions 8 and 8 are always located in the long holes 10 and 10. The parts 7 'and 7' are press-fitted to make the state shown in FIG. 1 in advance.

In the state shown in FIG. 1, the rings 22, 22 prevent the bolts 21, 21 from dropping out of the elongated holes 10, 10, and the tip of the non-circular portion 8 on the threaded portion 7 side always has the elongated holes 10, 21. 10
Within. As a result, the seat surfaces 11, 11 at the tips of the non-circular portions 8, 8 do not sit on the opening edges of the long holes 10, 10, and the conventionally experienced inconvenience does not occur in this example. The rings 22, 22 are made of steel having a C-shape, that is, a mating portion.
Side.

FIG. 5 shows a state in which the half bodies 2 and 2 are combined and the nuts 6 and 6 are tightened. Even if the rings 22, 22 are located between the facing flanges 3, 3, the nuts 6, 6 are removed and the halves 2, 2 are separated, the bolts 21, 21 fall off from one of the halves 2. Never.

FIG. 3 shows another example of the bolt 21. This example
An annular groove 23 is provided in the cylindrical portion 7 ', and a C-shaped ring 22 is fitted into the groove 23. This example is ring 2
2 prevents the bolt 21 from coming off and fixes its position.

In the example shown in FIG. 4, the cylindrical portion 7 'is shortened or eliminated, and the ring 22' is fitted into the screw portion 7. The ring 22 'has a plurality of spaced claws 25 on its inner peripheral portion. And
The inner diameter of the claw 25 is slightly larger than the root diameter of the screw portion 7. The ring 22 'is a C-shape having an abutment, but as shown on the left side of FIG. 4, a ring 24 having no abutment, which is moved from an end of the threaded portion 7 to a predetermined position along a valley of the threaded portion 7. You may send it.

[Brief description of the drawings]

FIG. 1 is an exploded front view of a split joint according to an example of the present invention.

FIG. 2 is a perspective view of an example of a bolt.

FIG. 3 is a perspective view of another example of a bolt.

FIG. 4 is a perspective view of another example of the bolt.

FIG. 5 is a front view of a state where a half body is tightened.

FIG. 6 is a perspective view of a conventional half body.

FIG. 7 is a perspective view of a conventional bolt.

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

[Explanation of symbols]

 2, 2 Half body 3, 3 Flange 6 Nut 7 Screw section 8 Non-circular section 10, 10 Slot 21, 21, Bolt 22, 22 ', 24 Ring 25 Claw

Claims (5)

[Claims] Claims 1. A split-type pipe joint in which a joint body disposed at opposite ends of a pipe to be connected is a half of a pair, and flanges provided on both sides of the half are tightened with bolts. The bolt has at least a threaded portion and a non-circular portion, the non-circular portion conforms to the shorter dimension of the long hole formed in the flange, and the bolt has a tip on the thread portion side of the non-circular portion. A split pipe joint characterized in that it has a bolt drop prevention ring at a position where it does not protrude from the opening edge of the elongated hole. 2. The split-type pipe joint according to claim 1, wherein a C-shaped ring is disposed in an annular groove provided in a cylindrical portion between the screw portion and the non-circular portion of the bolt. 3. The split-type pipe joint according to claim 1, wherein the ring fits into a thread valley. 4. The split-type pipe joint according to claim 3, further comprising a plurality of spaced claws on an inner peripheral portion of the ring, wherein an inner diameter of the claws corresponds to a root diameter of the threaded portion. 5. The pipe joint according to claim 4, wherein the ring is C-shaped.