JPS6027253Y2 - thin metal gasket - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improvements in gaskets used for sealing stationary surfaces such as flange surfaces of piping, pressure vessels, and joint surfaces leading to various mechanical devices.

This gasket is used in piping flanges, valves, mechanical devices, etc. for various fluids, and is used to prevent fluids such as water, oil, gas, steam, and chemical solutions from leaking from joint surfaces. During use, leakage is inevitable, and this causes extremely large economic losses such as the hassle of replacing and retightening gaskets, the replenishment of fluid due to leakage, and production inhibition.

Particularly in recent years, leakage has caused environmental pollution, and flammable fluids have caused a risk of fire, explosion, etc., and have often become social problems.

However, although various studies have been conducted on these sealing techniques, the reality is that no significant progress has been made.

As mentioned above, gaskets are used to press between two opposing stationary surfaces to form a sealing surface and close off pressure fluid. things are used.

This gasket should generally satisfy the following requirements.

■ The seal must be chemically and thermally stable to the fluid used.

2. There should be no leakage inside the gasket.

3. When tightened, the surface of the gasket undergoes plastic deformation or elastic deformation, resulting in conformation of the joint surfaces.

4. Must withstand internal and external pressure.

5. There should be no change in seal surface pressure after tightening.

6. Must be marketable and economical.

7. Suitable for mass production.

At present, the most suitable gasket that satisfies the above conditions is one based on a metal material, but it has many drawbacks in terms of its structure and other aspects.

For example, conventional metal gaskets are shown in FIGS. 1-4.

FIG. 1 shows a conventional metal fabricated gasket, and FIG. 2 shows a cross-sectional view thereof.

This gasket is manufactured by cutting pure iron, stainless steel, etc., and its shape is limited to a ring shape due to processing, and both sides of the gasket are formed into triangular protrusions.

FIG. 3 mainly shows a thin stainless steel plate formed into a mountain shape or an arc shape by pressing or rolling.

FIG. 4 shows its cross-sectional shape.

These devices require a strong tightening force to achieve good contact with the opposing surface, and the flange portion needs to be thick.

This is caused by scratches or bruises on the contact surface that occur during manufacturing.
There are disadvantages in that scratches and the like occur, and a uniform product cannot be obtained, and in both cases, the cost is high.

In addition, in actual experiments, the quality is extremely unstable, and it is particularly difficult to prevent leakage of gas.

Therefore, the present invention improves the metal gasket, which originally has characteristics as a gasket, to provide a complete gasket that is the easiest to use, has uniform quality, and is highly suitable for mass production.

The proposed gasket will be explained using figures.

FIG. 5 shows an embodiment in which the surface of the gasket of the present invention has a continuous concave multi-row surface, and FIG. 6 shows its cross-sectional shape.

As is clear from the figure, the outer diameter and width 2 of the circular gasket 1 are determined by design.

A plurality of continuous concave surfaces are provided within this width 2.

As shown in the cross-sectional view of FIG. 6, concave surfaces 3 and convex surfaces 4 are provided alternately, and the width dimension of the concave surfaces is necessarily determined from the design based on the required amount of the total area of the gasket convex surfaces 4.

The calculation method for this design is determined by JIS and other standards, so it can be easily designed.

Once the gasket design is completed, the gasket is manufactured using an etching method.

To explain the outline of the etching method, first, a designed gasket is accurately drawn, and a photographic original plate is created based on this.

On the other hand, the surface of a metal plate such as stainless steel is previously finished to make it smooth, oil etc. on the surface is removed, and the surface is treated with a photosensitive material to form a film layer.

The gasket shape is printed on the photographic original plate through exposure, development, and contact processing.

By etching this metal plate with a solution such as secondary iron chloride, the photosensitive area (exposed metal area) is corroded to form a concave surface.

At this time, the required depth can be obtained by appropriately processing the depth.

After applying this treatment to both sides, the outer and inner diameters are punched out.

In this method, a specified gasket is manufactured from a metal plate, but a method of manufacturing a metal gasket as needed is also conceivable.

That is, as shown in FIG. 7, a gasket of the required shape is punched out from a metal plate in which concave spots in an intermittent or continuous pattern are previously provided on the entire surface of the metal plate.

Figures 7a''-f show typical examples of speckled patterns.

This metal plate can be easily manufactured by etching.

8 and 9 show an embodiment of the gasket of the present invention, in which a continuous concave surface 5 and a spotted pattern 6 are combined.

Of course, those with only the spotted pattern 6 are also manufactured.

Since the present invention differs from the conventional manufacturing method, it has various great advantages.

1. The concave surface of the gasket is chemically treated instead of press working or cutting as in conventional methods, and the gasket surface is not bruised, scratched or cracked, resulting in high leak-proofing properties.

2. Since it is manufactured based on a photographic original plate, accurate and uniform products can be obtained.

3. Accurate measurements can be made using metal plates, so the width of the gasket is smaller than conventional gaskets, allowing for smaller valves, equipment, etc.

4. Gaskets with complicated shapes can be easily manufactured.

5 The width of the concave surface can be up to a minimum of 0.2wn, and the depth is generally 0.2mm to a minimum of 0.05mm, but deeper depths are also possible, and all gasket shapes can be used. satisfy the request.

6. When using the gasket of the present invention, by applying a resin paste or silicone material to its surface, the concave surface is filled and the sealing performance is further improved.

The above-mentioned gasket can be used in various ways, but
It has extremely high industrial value because it can completely and reliably prevent leakage of all kinds of fluids, from high-pressure, high-temperature fluids to gaseous bodies.

[Brief explanation of drawings]

Figure 1 is a conventional metal processed gasket, Figure 2 is a sectional view of Figure 1, Figure 3 is a conventional thin sheet metal pressed gasket, Figure 4 is a sectional view of Figure 3, and Figure 5 is the proposed gasket. The concave surface is provided in the form of multiple continuous lines. FIG. 6 is a cross-sectional view of FIG. 5, and FIG. 7 shows a metal plate having speckled concave surfaces on both sides to punch out a gasket of the required shape. Typical examples of speckled patterns are shown in a to f. FIGS. 8 and 9 show typical examples of gaskets in which concave surfaces are combined with continuous lines and speckled patterns. 1...Gasket,...Concave surface, 4...Convex surface, 2...Gasket width, 3...5...Concave continuous line, 6... ... Spotted pattern.

Claims (1)

[Scope of utility model registration request] In a thin metal gasket, both sides of the gasket are formed with multiple concave surfaces in a continuous line shape, or concave surfaces with speckled patterns of corners, circles, dots, and lines, or a concave surface with a continuation of the above-mentioned concave surfaces. A combination of lines and speckled concave surfaces is formed, and the width of the concave surfaces is at least 0.2 Trr.
1. A thin sheet metal gasket characterized in that a concave surface having a depth of at least 0.05 mm or more and a minimum depth of 0.05 mm or more is formed by an etching method.