JPH0996388A - Packing used in pipe joint part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To respond to a shearing displacement of a joint, by laminating and burying a desired number of laminate members in an elastic member, fixing flange form iron plates to both sides of the elastic member, and connecting it to the flanges of the pipe ends respectively through the iron plates. SOLUTION: In an elastic member 1 such as a natural rubber, a synthetic rubber, or a synthetic resin, a laminate member 2 of a woven cloth of a natural, synthetic, or metallic fibre, a nonwoven fabric, or a metal plate, is buried in the condition laminating a desired number being held by the elastic members 1 placing an interval, and iron plates 3 are fixed integrally on both sides in the flange form, so as to compose a packing 4. The iron plates 3 are fitted to the flanges 6 at the ends of pipes 5 to connect respectively, they are fixed by bolts 7, and the pipes 5 are connected integrally. Since the elastic members 1 at the end of the packing 4 is provided between the flanges 6 and the iron plates 3, a normal packing is not necessary to use. Consequently, both pipes are not connected directly, the joint can be shearing displaced, and no breakage of the connecting unit is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing used for a joint portion of a pipe for flowing a fluid such as a water pipe or a gas pipe.

[0002]

2. Description of the Related Art In a joint in which flanges formed at the end of a pipe are joined together and fixed by bolts, a packing is interposed between the flanges to prevent fluid leakage. Such packings are generally made of leather, natural rubber,
Synthetic rubber, synthetic resin, metal, etc. are used, and their shapes are also V-shaped, L-shaped, U-shaped, J-shaped, etc. that are suitable for the application and the type of fluid to be passed.

[0003]

According to such a conventional technique, when an impact such as an earthquake occurs, the bending moment is concentrated on the flange surface of the joint portion, and the packing is compressed and damaged as shown in FIG. There is a problem that the bolts that match the flanges are damaged.

[0004]

Therefore, according to the present invention, a desired number of laminated materials are embedded in an elastic material so as to be sandwiched between the elastic materials, and iron plates are integrally fixed in a flange shape on both sides thereof. It is characterized in that the pipes are connected to the flanges at the end portions of the respective pipes that are configured and connected through the iron plates with bolts.

According to such a construction, since the joints of the pipes are not directly connected to each other but are connected via the packing, shear displacement can be performed by the packing, so that the bolt is not broken and an earthquake or the like occurs. It is possible to cope with the shear displacement of the joint portion that occurs during the above.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the packing of the first embodiment, FIG. 2 is an explanatory view of a connected state, FIG. 3 is an explanatory view showing a deformed state of the packing, and FIG. 4 is a sectional view of the packing of the second embodiment. First Embodiment In elastic material 1 such as natural rubber, synthetic rubber or synthetic resin, a woven or non-woven cloth made of natural fiber, synthetic fiber, metal fiber or the like, or laminated material 2 made of metal plate is spaced. A desired number of layers are embedded so as to be sandwiched between the elastic members 1, and the iron plates 3 are integrally fixed in a flange shape on both sides thereof to form the packing 4. The fixing means may be any means, for example, a circular projection formed on the side surface of the iron plate is embedded in the elastic material 1 to be integrated, or the side surface of the iron plate and the end surface of the elastic material are integrated by an adhesive material. May be.

The packing 4 thus constructed is fitted to the flanges 6 at the respective ends of the pipe 5 connecting the iron plates 3 at both ends thereof and fixed to each other with bolts 7 so that the pipe 5 sandwiches the packing 4. Connect together. At the time of this connection, a packing made of conventional leather, natural rubber, synthetic rubber, synthetic resin, metal or the like is interposed between the flange 6 and the iron plate 3 to prevent fluid leakage.

First Embodiment According to the above-mentioned embodiment, the iron plates 3 are attached to both side surfaces of the elastic material 1 in which the laminated material 2 is embedded. According to this, the flange 6 and the iron plate 3 are attached when connecting with the pipe. Requires conventional packing between three. Therefore, in the present embodiment, as shown in FIG. 4, a part of the iron plate 3 is embedded and fixed so that the iron plate 3 is fixed near both sides of the elastic material 1 in which the laminated material 2 is embedded.

According to the packing 4 thus constructed, the iron plates 3 are aligned with the flanges 6 at the respective ends of the pipes 5 to be connected, and the iron plates 3 are fixed together by bolts 7 to integrally connect the pipes 5. At the time of this connection, the elastic material 1 at the end of the packing 4 is interposed between the flange 6 and the iron plate 3, so that packing of ordinary leather, natural rubber, synthetic rubber, synthetic resin, metal or the like as in the past is used. Need not intervene.

FIG. 5 is a graph showing the relationship between the stress and the displacement rate of the packing 4 according to each of the above embodiments and the packing of natural rubber alone. The relational expression between stress and bending moment is shown in (1) below. 1 σ = M / Z, M = P × δ (1) σ: Stress M: Bending moment Z: Cross-sectional shape P: Load δ: Displacement A conventional packing that is soft like rubber alone has an external force greater than that of the packing of the present invention. In case of the action of, the amount of displacement is large, and according to the formula (1), the larger the displacement under the same load is, the larger the bending moment becomes, and the larger the stress applied to the packing having the same cross section becomes. Therefore, the conventional packing has a large load due to displacement, and the packing is destroyed.

A conventional hard packing such as a metal gasket has a displacement of almost 0 according to FIG. When a substance whose displacement amount is almost 0 is displaced, an impact force is generated in the joint portion and the bolt is broken. Therefore, according to the present invention in which fibers are laminated and embedded in an elastic material, as compared with a conventional soft packing, since the displacement for the same load is small, the bending moment is also small, whereby the stress applied to the packing is small and the packing is not broken. To be prevented. Moreover, since the displacement is possible, the displacement of the joint portion of the pipe is followed and no impact force is generated.

Further, as shown in FIG. 3, by fixing the iron plates 3 on both sides of the packing to the flanges of the respective pipes with bolts, the flanges of the pipes to be connected are not directly connected with each other by bolts. Shear displacement is possible and the bolt will not break.

[0013]

According to the present invention described in detail above, a desired number of laminated materials are embedded in an elastic material so as to be sandwiched by the elastic materials, and iron plates are integrally fixed in a flange shape on both sides thereof. By connecting the flanges at the ends of the respective pipes that are configured as described above with connecting tools such as bolts through the iron plates, the pipe joints do not directly connect the pipes to each other, and Since the joint is sheared and displaced, the joint can be shear-displaced, the connector is not broken, and the joint can be shear-displaced when an earthquake or the like occurs.

Further, since the laminated material is embedded in the elastic material against strong compression acting on the joint, it has compression resistance and does not break, and as a result, damage to the joint can be prevented. You can do it.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a first embodiment.

FIG. 2 is an explanatory diagram of a connected state

FIG. 3 is an explanatory view showing a deformed state of the packing.

FIG. 4 is a sectional view of a packing according to a second embodiment.

FIG. 5 is a graph showing the relationship between packing stress and displacement rate.

FIG. 6 is an explanatory view showing a cut state of a bolt.

[Explanation of symbols]

 1 Elastic material 2 Laminated material 3 Iron plate 4 Packing 5 Tube 6 Flange

Claims (6)

[Claims] 1. A laminated material is embedded in an elastic material in a desired number of laminated layers so as to be sandwiched between the elastic materials, and iron plates are integrally fixed in a flange shape on both sides of the laminated material. A packing used for a joint portion of a pipe, which is connected to a flange of an end portion through the iron plate. 2. A packing used in a joint portion of a pipe according to claim 1, wherein an iron plate is attached to an end surface of the elastic material. 3. A packing used in a joint portion of a pipe according to claim 1, wherein an iron plate is partially embedded in an end portion of an elastic material and attached. 4. The elastic material according to claim 1, wherein the elastic material is natural rubber,
Packing used for pipe joints, which is made of synthetic rubber or synthetic resin. 5. The packing used in a joint portion of a pipe according to claim 1, wherein the laminated material is a woven cloth or a non-woven cloth. 6. A packing used in a joint portion of a pipe according to claim 1, wherein the laminated material is a metal plate.