JPS6128136Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a semi-metallic gasket used as a sealing material for the bonnet portion of a valve for high temperature and high pressure applications.

Conventionally, this type of gasket has been known as a semi-metallic gasket, which is made by combining an annular corrugated metal thin plate and a round asbestos yarn, and press-forming this into a ring shape using a mold, as shown in Figure 3. ing.
The metal corrugated thin plate A is exposed on the inner and outer peripheries of this gasket, so when this gasket is attached to the valve bonnet, the metal corrugated thin plate A comes into contact with the other surface, and is used as a sealing material. This also caused leakage due to lack of compatibility. Furthermore, when molding this gasket, it is difficult to combine the corrugated metal sheet and asbestos yarn and load the combination into a mold.

Therefore, in the present invention, annular metal corrugated thin plates and sheet-like cushioning materials such as asbestos paper are arranged alternately in the vertical direction, and the cushioning materials are placed on the inner and outer peripheries and pressurized in a ring shape to form metal corrugated sheets. By integrally forming the thin plate and the cushioning material and providing a notch on the lower surface of the inner periphery of the ring, a gasket is provided which has excellent conformability and sealing performance and is easy to manufacture.

The configuration of the present invention will be explained with reference to the drawings.

1 is a corrugated metal thin plate, which is a thin metal plate formed into a corrugated shape.

2 is a sheet-like cushioning material such as asbestos paper,
Ceramic fiber sheets, asbestos joint sheets, unsintered tetrafluoroethylene resin tapes, graphite tapes, etc. are similarly selected and used.

Either the metal corrugated thin plate 1 and the cushioning material 2 are overlapped and spirally wound to form a ring shape, or the ring-shaped metal corrugated thin plate 1 and the cushioning material 2 are alternately arranged. A cushioning material 2 is placed on the outer periphery of the annular body, which is then loaded into a mold and pressurized to integrally form the corrugated metal sheet and the cushioning material.

Reference numeral 3 denotes a tapered notch at the lower part of the inner circumference of the gasket, which is formed by processing during manufacturing or after molding.

When used as a so-called self-closing sealing material that compresses the gasket with the load internal pressure (internal fluid pressure) and improves the sealing effect, it seals the fluid by concentrating the internal fluid pressure on the tapered part. This is a gasket.

In addition, after forming an annular body by arranging the metal corrugated thin plates 1 and the cushioning material 2 alternately, applying a lubricant such as graphite to this annular body and press-molding it in a mold, sealing performance can be achieved. A gasket with good quality can be obtained.

As described above, the present invention consists of annular corrugated metal thin plates and sheet-like cushioning materials such as asbestos paper arranged alternately in the vertical direction, cushioning materials placed on the inner and outer peripheries, and pressure applied in a ring shape. Since the metal corrugated thin plate and the cushioning material are integrally formed, the inner and outer cushioning materials come into contact with the mating metal surface, and the cushioning material blends well with the mating metal surface, creating a gasket with excellent sealing properties. It is.

Furthermore, by providing a notch on the lower surface of the inner periphery of the ring to form a tapered shape, stress concentration due to internal fluid pressure occurs at the tapered tapered portion, thereby achieving an effective sealing action.

In addition, in the conventional gasket shown in Fig. 3, it is complicated to manufacture by combining the metal corrugated thin plate A and the round asbestos yarn, but in the present invention, since the cushioning material 2 is in the form of a sheet, the metal corrugated thin plate 1 It is easy to combine and arrange alternately and is simple to manufacture.

Furthermore, by changing the material of the sheet-like cushioning material 2, it is possible to obtain a gasket that can be applied to various usage conditions.

[Brief explanation of the drawing]

Figure 1 is a plan view of the gasket according to the present invention.
FIG. 2 is a sectional view of FIG. 1, and FIG. 3 is a sectional view of a conventional gasket. Numbers, 1...Metal corrugated thin plate, 2...Sheet-like cushioning material, 3...Tapered notch.

Claims (1)

[Scope of utility model registration request] Annular corrugated metal thin plates 1 and sheet-shaped cushioning materials 2 such as asbestos paper are arranged alternately in the vertical direction, and the cushioning materials 2 are placed on the inner and outer peripheries and pressed into a ring shape to form the metal corrugated thin plates 1. A semi-metallic gasket in which a ring and a cushioning material 2 are integrally formed, and a notch 3 is provided on the lower surface of the inner periphery of the ring.