JPS591872A - Gasket - Google Patents

Abstract

PURPOSE:To obtain sufficient holding force of torque and to increase heat resistance, by preparing a coating layer of a metallic plate surface from a mixture material containing compressive fiber and rubber and preventing lateral dislocation of said coating layer. CONSTITUTION:Because rubber compressive fiber layers 3 are coated to a metallic plate 2, small rigidity in a joint face or large tightening force of a bolt in a flange or the like never causes the layer 3 to exceed a compressive elastic limit to be laterally dislocated even if large stress is concentrated to the peripheral part of a bolt hole 6. Further a small thickness of the rubber/compressive fiber layer 3 obtains sufficient holding force of torque. Still further a temperature limit of heat resistance can be increased and a gasket can be used even under an environment at high temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gasket 1- constructed by combining a metal monthly rate and a non-metal monthly rate.

Non-metallic gaskets 1~ that have been commonly used are:
It is made by punching sheet materials made of asbestos and rubber mixtures, cork and rubber mixtures, course fibers, and other non-metallic materials into the required shape. Therefore, it had the following drawbacks.

(b) Since the entire surface of the gasket is in contact with the joint surface of the 7 flange, etc., there are cases where the rigidity of the joint surface of the flange etc. is low, the tightening force of the bolt that tightens the gasket is low, If the span is long, the necessary contact pressure cannot be obtained and leaks often occur.

(b) In order to prevent leakage, when the tightening force of the ports 1 to 1 is increased, the gasket 1 material receives an excessive load around the bolt, exceeding its compressive elastic limit, and the gasket breaks.

C) In recent years, there have been many cases in which a large thermal load is applied to the joint surfaces of the 7 langes, etc., causing thermal deformation on the joint surfaces. Due to the deformation, a large stress is applied to the gasket 1-, which often causes the gasket to protrude from between the joint surfaces or break, resulting in leakage.

In addition, many gaskets have been used in the past that have increased mechanical strength by inserting a steel plate or the like into the material of the non-metallic gasket 1, but even in this type of conventional gasket 1-, the flat Due to the structure C and the thick layers of the non-metallic gaskets 1 to 1, it is not possible to sufficiently eliminate the drawbacks (a) to (c) of the non-metallic gaskets.

In addition, in recent years, the gasket body has been constructed by coating both sides of a steel plate with a thin layer of single rubber, and protrusions have been provided on the gasket body to increase the contact surface pressure. Also came to be used.

However, in this type of conventional gasket, when the rigidity of the joint surface such as the flange is low or when the tightening force is large, the rubber layer covering the steel plate exceeds the compressive elastic limit, resulting in lateral flow ( Flow) and increased Herc Down by 1. Further, accompanying this, thermal deformation or structural deformation (deformation not based on thermal loads) of the flange increases, often causing leakage. Furthermore, the layer covered by the steel plate was a layer C of simple rubber.
However, the heat resistance temperature limit is usually around 150℃,
The drawback is that it cannot be used in high-temperature environments.

An object of the present invention is to provide a gasket that can eliminate all of the various drawbacks of the conventional gaskets.

The gasket according to the present invention that achieves this purpose is
A gasket 1 body is formed by coating a metal plate with a thin layer of a mixture containing compressible fibers and rubber; It has a protrusion.

The present invention will be explained in more detail below.

1 and 2 show one embodiment of the present invention.

The gasket 1 body 1 consists of a metal plate 2 such as a steel plate having relatively high elasticity, and a thin layer of a mixture of compressible fibers such as asbestos and rubber coated on both sides of the metal plate 2. (referred to as a rubber/compressible fiber layer) and an anti-adhesion agent layer 4 coated on the surface of the rubber/compressible fiber layer 3 in order to prevent the gasket from adhering to the joint surface of the flange etc. .

Here, as the compressible 41 cloth, in addition to asbestos, 1?
Fibers with similar compressibility properties can be used, such as /lowerose fiber, cork, carbon fiber, etc. In addition, the mixing ratio of the rubber and the compressible IJ]i string in the rubber/compressible fiber layer 3 is, for example, in the case of a combination of rubber and asbestos. On the other hand, it is preferable that the amount of asbestos is about 3-7 parts by weight. Also. The thickness of the rubber/compressible fiber layer 3 is 50 to 10 mm on one side.
It is preferable to set it to about 0μ.

The cassette main body 1 has holes 5 and bolt holes 6 through which fluid passes.

A protrusion 7 having an arcuate cross section is formed on the gasket wooden body 1 by pressing so as to surround the holes 5 and 6.

Since this gasket C'' is provided with the protrusion 7, the contact area between the gasket 1- and the joint surface such as a flange is limited, so when the rigidity of the joint surface is low,
Even when the tightening force of the bolts that tighten the gasket is small or when the span between the bolts is long, the necessary contact surface pressure can be obtained and no leakage will occur.

In addition, since the metal plate 2 is covered on the right side, the overall mechanical strength is strong, and it has a high degree of resistance against thermal deformation and structural deformation of the joint surfaces such as flanges, and has a high resistance to rubber and compression. Because the elastic fiber layer 3 is not made of rubber alone, but is made of a mixture of rubber and compressible fibers, the rigidity of the joint surfaces such as 7 lunges is small, and the tightening horns of ports 1 and 1 are large. Even if a large stress is concentrated around the rubber/compressible fiber layer 3, the elasticity of the rubber/compressible fiber layer 3 will not exceed the compressive elasticity limit and lateral flow will not occur, and the thickness of the rubber/compressible fiber layer 3 is thin. i~Has silk holding power.

Furthermore, as described above, since the rubber/compressible fiber layer 3 is made of a mixture of rubber and compressible fibers rather than a single rubber, the heat resistance limit can be increased, and it can be used even in high-temperature environments.

As described above, the gasket 1- according to the present invention is a type of the conventional gas/liter 1-. This provides an excellent effect in that it can eliminate the drawbacks of

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the gasket 1 to 1 according to the present invention, and FIG. 2 is a sectional view taken along line 1--2 in FIG. 1. , 1... Nojscut body, 2... Metal plate, 3...
- Rubber/compressible fiber layer, 5... Holes for passing fluid, 6... Pol 1 to holes, 7... Protrusions.

Claims (1)

[Claims] A gasket body formed by coating a metal plate with a thin layer of a mixture containing compressed bamboo fiber and rubber, and a protrusion provided on the gasket body so as to surround a hole penetrated through the gasket body. A gasket comprising: