JPH0531327Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a spiral gasket used for sealing, for example, a pipe joint part for high-pressure equipment.

Technical background of the invention and its problems As shown in FIG. The gasket G interposed between the flange 1 and the flange 1 are brought into close contact with each other to seal the high-pressure fluid flowing through the internal passage 3 from leaking to the outside.

As shown in FIG. 4, this gasket G is made by winding a first tape 4 made of a thin metal plate and a second tape 5 made of a filler material in a spiral shape.

The first tape 4 is a thin metal plate with a cross section of a "V" shape or a W shape with two stacked "V" shapes (hereinafter simply referred to as "V shape"), and the second tape 5 is composed of asbestos paper, expanded graphite tape, tetrafluoroethylene resin tape, etc., which have been conventionally used as filler materials.

Then, in this gasket G, the winding start and winding end portions are wound two to three times only with the first metal tape 4, and this is fixed by spot welding or the like to form the gasket body Ga. A plate-shaped reinforcing body 6a is provided on the inner and outer peripheral surfaces of Ga.
6b is provided.

In this gasket G, the gasket body
When forming Ga, the first tape 4 and the second tape 5 are generally wound from the center side in a laminated state, and the outer diameter is slightly smaller than the inner diameter of the attachment hole 7 of the outer reinforcing body 6b. Only the first tape 4 is 2
After winding it ~3 times, it is fixed by spot welding, and then the first tape 4 is wound two to three times, and the outer diameter of the gasket body Ga is adjusted to the mounting hole 7.
Slightly larger than the inner diameter of. In this way, the reason why the first tape 4 is unrolled even after spot welding is to attach the gasket body Ga to the attachment hole 7 of the outer reinforcing plate 6b.
This is to insert the unrolled portion of the first tape 4 into the gap between the gasket main body Ga and the outer reinforcing body 6b so as to close the gap when the gasket main body Ga and the outer reinforcing body 6b are inserted into the gasket.

However, even after spot welding, the first tape 4 is rolled two or three times, and that part of the first tape 4 is inserted into the gap between the gasket body Ga and the outer reinforcing body 6b, and this gap is closed. It is extremely difficult to fill in all of the holes, and this is the bottleneck in installing the outer reinforcement.

In particular, this gasket body Ga has a "V"-shaped cross section so that it is elastically deformed when pressurized by both flanges 1, 1, so that the thin metal part that is the discarded part after spot welding is When inserting a manufactured tape into a small gap, the tape itself loses its shape, making the insertion process even more difficult. In addition, the completed gasket tends to have insufficient fit between the gasket body and the outer reinforcing body, and if the outer reinforcing body is detached from the gasket body and is installed between the flanges, there is a risk that the high-pressure fluid may not be sealed properly. Therefore, a great deal of effort is spent on fitting the outer reinforcing body and the gasket body.

Purpose of the invention The present invention was made in view of the above-mentioned drawbacks and problems.For example, it is a thin metal tape with a predetermined cross-sectional shape in a spiral gasket used for sealing parts of pipe joints for high-pressure equipment. To provide a spiral gasket which can be easily inserted into a gap between an outer reinforcing body and a gasket body without deforming the gasket.

Furthermore, by making it possible to smoothly insert the metal tape, the present invention eliminates the bottleneck in the process of attaching the outer reinforcing body to the gasket, automates the process of attaching the outer reinforcing body, and reduces the cost of the gasket. The aim is also to reduce

Summary of the invention In order to achieve the above object, the invention involves superimposing a first tape made of metal and a second tape made of filler material and winding them in a spiral shape.
A gasket body is formed by discarding and winding only the first tape at least at a winding end portion to form a gasket body having a surplus portion of the first tape at the winding end portion, and a gasket body having the surplus portion of the first tape. is fitted into a mounting hole formed in a metal reinforcing body that is thinner than the axial thickness of the gasket body, and the excess portion of the first tape is inserted between the reinforcing body and the gasket body. In the spiral gasket that is held between the gaskets, after the gasket body is fitted into the mounting hole in a circumferential part of the inner circumferential wall of the mounting hole opened in the reinforcing body, the gasket body or the reinforcing body is The present invention is characterized in that a notch is formed through which the surplus portion of the first tape can be inserted when either one of the tapes is rotated relative to the other.

In the case of a spiral gasket having such a structure, metal is inserted into the gap between the gasket body and the reinforcement while rotating either the gasket body or the outer reinforcement by using the notch in the reinforcement. This means that the first tape made from the gasket can be easily inserted, this gap can be narrowed as much as possible, and the connection between the gasket body and the outer reinforcing body can be strengthened.

In particular, when inserting the first metal tape into the gap, if either the gasket main body or the outer reinforcing body is rotated, the first tape can be easily inserted into the gap.
The work is facilitated, and the bottleneck in the work of attaching the outer reinforcing body is therefore eliminated, and the entire apparatus for performing these works can be automated.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view showing the main parts of the spiral gasket according to the present invention, and Fig. 2 is a perspective view showing only the outer reinforcing body. are given the same reference numerals.

As shown in FIG. 1, the gasket G according to the present invention includes a first metal tape 4 having a "V"-shaped cross section;
A second tape 5 made of filler material is overlapped and spirally wound to form the gasket body Ga. As the material of the first tape 4, aluminum, stainless steel, etc. are used. Further, as the filler material constituting the second tape 5, for example, asbestos paper, expanded graphite tape, tetrafluoroethylene resin tape, etc. are used.

An outer reinforcing body 6b made of metal and thinner than the thickness of the gasket body Ga in the axial direction is provided on the outer periphery of the gasket body Ga to hold the gasket body Ga from the outer periphery.

This metal outer reinforcing body 6b has a mounting hole 7 into which the gasket main body Ga is inserted,
The inner peripheral wall of this mounting hole 7 is provided with the gasket body.
A V-shaped concave groove 7a is formed to match the shape of the outer circumferential surface of Ga, so that the gasket body Ga can be easily held.

As described above, this gasket body Ga is made by overlapping the first tape 4 and the second tape 5, winding them in a spiral shape, and spot welding them when they reach a predetermined size. The gasket body Ga is rotated two to three times, and the excess portion 4a of the first tape 4 at that portion is inserted into the mounting hole 7 with the excess portion 4a protruding diagonally from the gasket body Ga.

This fitting naturally creates a gap between the gasket body Ga and the outer reinforcing body 6b, but
This gap is filled with the surplus portion 4a.

In this case, in this embodiment, the outer reinforcing body 6b
A notch 8 through which the first tape 4 can be inserted into at least a part of the concave groove 7a of the mounting hole 7 in the circumferential direction.
is formed. This notch 8 is formed by cutting out a part of the concave groove 7a having a V-shaped cross section from one or both sides at the maximum depth of the concave groove 7a.

In particular, since the insertion often occurs at a limited position, the cut portion 8 may be formed at a predetermined position. When inserting, either the outer reinforcing body 6b or the gasket body Ga may be rotated; however, when either is rotated, the notch 8 allows the first tape 4 to slide smoothly as it rotates. It is desirable that the molding be inclined with respect to the upper surface 6c so that it can be inserted.

By forming the notch 8 in the outer reinforcing plate 6b in this way, the surplus portion 4a of the first tape 4 can be smoothly inserted into the gap between the gasket body Ga and the outer reinforcing body 6b through the notch 8. Therefore, it becomes easier to mold the gasket G, and it becomes possible to automate the device for molding the gasket G, thereby making it possible to reduce the manufacturing cost of the gasket G.

Note that the present invention is not limited to the embodiments described above, and can be modified in various ways.

For example, the first metal tape 4 is not limited to a V-shaped cross section, but may have a W-shaped cross section or other cross-sectional shapes. In that case, the concave groove 7a
The shape also needs to match that. Further, the cut portion 8 is not limited to one location, but may be provided at a plurality of locations. Furthermore, an inner reinforcing body may be arranged on the inner peripheral side of the spiral gasket according to the present invention.

Effects of the invention As described above, according to the invention, a notch through which the first tape can be inserted is formed in a part of the inner circumferential wall of the mounting hole opened in the reinforcing body. A spiral gasket used for sealing parts of pipe joints etc. can be easily formed.
Furthermore, since the first tape can be inserted reliably, the gasket manufacturing work can be automated, which not only facilitates the gasket molding work but also reduces the manufacturing cost of the gasket. can. Furthermore, the fitting operation becomes easy even when using a soft tape 4 such as aluminum or copper, which easily loses its shape.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of the spiral gasket according to the present invention, FIG. 2 is a perspective view showing only the outer reinforcing body, FIG. 3 is a sectional view showing the conventional spiral gasket in use, and FIG. FIG. 4 is an enlarged sectional view of FIG. 3. 4...First tape, 4a... Surplus portion, 5...
Second tape, 6b...outer reinforcement body, 7...attachment hole, 7a...concave groove, 8...notch, G...gasket, Ga...gasket body.

Claims (1)

[Claims for Utility Model Registration] A first tape made of metal and a second tape made of filler material are overlapped and wound in a spiral shape, and only the first tape is discarded at least at the end of the winding. A gasket body having a surplus portion of the first tape is formed at the end of the winding, and the gasket body having the surplus portion of the first tape is formed into a gasket body having a thickness thinner than the axial thickness of the gasket body. A spiral gasket that fits into a mounting hole formed in a metal reinforcing body and holds an excess portion of the first tape between the reinforcing body and the gasket body, After fitting the gasket body into the mounting hole in a circumferential portion of the inner peripheral wall of the mounting hole, when either the gasket main body or the reinforcing body is relatively rotated, the A spiral gasket formed with a notch through which the excess portion of the first tape can be inserted.