JP2000120953A - Packing for flange coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure watertightness between flanges and an insulating characteristic in a pipe fitting part respectively and to facilitate manufacture by boring bolt holes in the circumference edge of a link-type packing, forming a projection in the circumference edge of an inner hole, and coaxially embedding a ring-type reinforcing metal core in the thickness. SOLUTION: A bolt 7 is passed through one flange 5, and the bolt 7 is passed through a bolt insertion hole 2 in a flange coupling packing 1. A nut 8 is fastened around the bolt 7, and the packing 1 is compressed between both flanges 5. In this process, a projection 3 formed integrally along the circumferential edge of an inner hole 1a of the packing 1 is also compressed, and its compressing amount can be restricted by the thickness of a reinforcing metal core 4, so that excessive compression can be prevented. Therefore, the reinforcing metal core 4 part works as a stopper between both flanges 5 substantially so as to receive an inner pressure intensively. Even if fastening force of the bolt 7 is varied, a compression amount for the packing 1 and the projection 3 can be restricted to a constant amount by means of the reinforcing metal core 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a packing for a flange joint.

[0002]

2. Description of the Related Art A flange joint is generally known as a pipe joint. In this flange joint, a ring-shaped packing is inserted between the flanges arranged opposite to each other, the two flanges are fastened with a plurality of bolts and pressed, and the packing is compressed to maintain the watertightness of the pipe connection portion. It is.

[0003]

However, when a bending force is applied to the pipe connected by the flange joint, a difference is generated in the amount of distortion between the outside of the flange joint and the inside of the bend, resulting in a compressive force outside the bend. And the internal fluid may leak out.

[0004] Further, if the distortion becomes large, there is a problem that the packing is pushed out by the internal pressure from the gap generated by the external bending force, causing a large amount of water leakage.

In order to eliminate such a problem, the present applicant has previously proposed a packing in which the outer periphery of a ring-shaped elastic plate is surrounded by a ring-shaped metal plate and both are integrated (Japanese Utility Model Application Laid-Open No. 61-202788). No.).

However, since this kind of packing is made of two kinds of materials, it is formed separately, and finally, it is concentrically integrated, so that it takes time to manufacture, and furthermore, since the flange is in direct contact with the metal ring, Since the electrical insulation between the pipes cannot be maintained, not only corrosion due to underground stray current peculiar to the ground cannot be prevented, but also there is a problem that the pipes may be promoted.

The present invention solves the above-mentioned problems, and ensures the watertightness between the flanges even when a bending force is applied to the pipe joint, as well as the insulation of the pipe joint, and is easy to manufacture. SUMMARY OF THE INVENTION It is an object of the present invention to provide a packing for a flange joint.

[0008]

According to the packing for flange joint of the present invention, a bolt hole is formed at a position corresponding to a joining bolt insertion hole formed in a flange on a peripheral edge of the ring-shaped packing. A ridge is formed integrally along the periphery of the inner hole, and a ring-shaped reinforcing metal core is concentrically embedded within the thickness of the ring-shaped packing surface abutting on the flange surface. It is.

According to the packing for a flange joint,
Watertightness between the flanges is achieved by the ring-shaped packing,
On the other hand, when a bending force is applied to the pipe, holding of the packing itself between the flanges and watertightness are performed by the bolt holes, the ring-shaped reinforcing metal core and the ridges along the periphery of the inner hole.

[0010]

Next, an embodiment of a packing for a flange joint according to the present invention will be described. FIG. 1 is a plan view of a packing for a flange joint according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line XX of FIG.

In FIG. 1, reference numeral 1 denotes a packing for a flange joint, which is entirely formed of a material having rubber-like elasticity such as synthetic rubber such as CR or NBR or urethane resin, and has a flange as shown in FIG. And a ring shape of approximately the same size.

Reference numeral 2 denotes a bolt insertion hole, and a plurality of bolt insertion holes are formed along the periphery of the flange joint packing 1 at positions coaxial with the bolt insertion holes 6 provided in the flange 5 (FIG. 3). It is drilled at a position corresponding to the insertion hole.

Reference numeral 3 denotes a ridge, which is integrally formed along the peripheral edge of the inner hole 1a of the ring-shaped packing 1 as clearly shown in FIG. Reference numeral 4 denotes a reinforcing metal core, which is made of stainless steel, steel or aluminum light alloy, and is embedded in the thickness of the ring-shaped packing 1.

As shown in FIG. 2, the reinforcing metal core 4 has a thickness smaller than the thickness d of the ring-shaped packing 1, and is completely embedded so that the metal portion is not exposed to the outer surface. The reinforcing metal core 4 is used for the ring-shaped packing 1.
Are integrally embedded in the inside during vulcanization molding and molded simultaneously.

Next, the use state of the packing 1 for a flange joint will be described. As shown in FIG. 3A, a bolt 7 is inserted into one flange 5, and the bolt insertion hole 2 of the packing 1 for flange joint is inserted into the bolt 7.

Therefore, even if the packing for flange joint 1 is not self-supporting, it is suspended and supported by the inserted bolts 7, maintains a flat developed shape along the flange 5, and is supported coaxially with the flange 5. An eccentric state is prevented.

Next, when the nut 8 is fastened to the inserted bolt 7 by tightening, the packing 1 for the flange joint is compressed between the flanges and the ridge 3 is also compressed as shown in FIG. The amount of compression is limited by the thickness of the reinforcing metal core 4, and excessive compression is prevented.

The reinforcing metal core 4 and the flange 5,
As shown in FIG. 4, when the internal pressure P acts on the flange joint packing 1 because the compressive force between the flanges 5 is strong, the reinforcing metal core 4 acts as a substantial stopper between the flanges 5 to reduce the internal pressure. Take strong.

Even if the fastening force of the plurality of bolts for joining the flanges varies, the amount of compression of the packing is limited by the reinforcing metal core 4, so that the amount of compression of the ridge is also fixed. As a result, the compression ratio of the ridge can be easily managed.

[0020]

As described above, when the packing for a flange joint of the present invention is inserted between the flanges, the packing for the flange joint can be supported concentrically by inserting the packing for the flange joint into the joining bolt. Even if it is a flexible packing for a flange joint without independence, it can be reliably coaxially arranged between the flanges.

Further, when the joining bolt is fastened by being inserted between the flanges, a material having a rubber-like elasticity in which the compression amount of the ridge can be uniformly adjusted by the cooperation of the compression of the ridge and the embedded reinforcing metal core. Thus, permanent deformation due to the compression of the ridge can be prevented, and a long-term seal can be achieved.

Further, a sealed airtight space is formed by the opposed flange surface and the reinforcing metal core, whereby a reliable seal can be achieved even when internal fluid pressure is applied. Therefore, even if a bending force acts on the pipe and a gap is formed on the outside between the flange surfaces, the sealing performance is not deteriorated, and an accident that the packing pops out due to the internal fluid pressure and leaks can be prevented.

Further, since the reinforcing metal core is embedded in the packing for the flange joint, electrical insulation between the joints is surely performed, and there is an effect that corrosion due to stray current is prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view illustrating a state of use of the embodiment;
(A) shows a state before bolt fastening, and (b) shows a state after tightening.

FIG. 4 is an enlarged sectional view illustrating the operation of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flange joint packing 2 Bolt hole 3 Ridge 4 Reinforcement metal core 5 Flange 6 Bolt hole 7 Bolt 8 Nut

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinsuke Kishida 2-26-2 Ohama-cho, Amagasaki-shi, Hyogo F-term in Kubota-Mukogawa Works 3H016 AC01 AD02 AD06

Claims (1)

[Claims] 1. A bolt hole is formed at a position corresponding to a joining bolt insertion hole formed in a flange on a peripheral edge of a ring-shaped packing, and a ridge is integrally formed on a peripheral edge of an inner hole of the ring-shaped packing along the peripheral edge. And a ring-shaped reinforcing metal core is concentrically embedded within the thickness of the ring-shaped packing surface that contacts the flange surface.