JPH10176823A - Seal member for high-temperature piping flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a seal member, easy in manufacturing, capable of being re-installed on the surface of a flange and simple in the regulation of clamping, by forming the axial sectional configuration of a pipeline so as to be rohmbus, S in the seal member, employed for a high-temperature piping flange for guiding high-temperature combustion gas and the like. SOLUTION: A seal member 1, employed for high-temperature piping flange, is formed so as to have rohmbus sectional configuration having an annular projected part 2 on a surface contacted with the flange. When the seal member 1 is pinched by flanges 3, 4 and is clamped by a plurality of bolts 5 and nuts 6, the projected part 2 bites into respective surfaces 7, 8 of both flanges 3, 4 and is collapsed to develop seal effect. Such a seal member 1 is readily machined and is provided inexpensively. In this case, the seal member 1 can be structured so as to have double mountains by providing two pieces of projected part 2 on one surface, contacted with the surface of the flange, while the other surface is formed of single crest structure and the size of diameter of the projected part 2 in the single crest structure is determined so as to have an intermediate value between respective diameters of both projected parts 2 in the double crest structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sealing member for a high-temperature pipe flange.

[0002]

2. Description of the Related Art Conventionally, in a high-temperature pipe for introducing a high-temperature combustion gas or the like, a metal gasket, a metal packing, or the like has been used as a sealing member of a flange portion for connecting the pipe. Typical shapes of these conventional sealing members are those having a flat plate shape and those having a circular cross section like an O-ring,
Or it was a hollow O-ring.

[0003]

Among the above, the flat plate-shaped one has a drawback in that it is difficult to obtain a parallelism on both sides of the gasket from the viewpoint of manufacture, and the sealability is easily impaired due to small dust being caught. Was. On the other hand, it is difficult to disassemble and restore a flange, which has a circular cross section such as an O-ring, at the original position on the flange surface. In addition, it was difficult to adjust the tightening torque with a hollow O-ring.

An object of the present invention is to provide a seal member for a high-temperature pipe flange which can be easily manufactured, can be re-installed on a flange surface, and can be easily adjusted for tightening.

[0005]

According to the present invention, there is provided a seal member for a high-temperature pipe flange according to the present invention, which is a metal (for example, stainless steel) gasket having a rhombic cross section in the pipe axial direction of the seal member.

In another aspect of the present invention, a seal member for a high-temperature pipe flange, which achieves the above object, is annular and has different diameters (diameter a <diameter b) over the entire contact surface of the seal member in contact with the flange. Circle of diameter a is diameter b
Metal (e.g., located in the circle of)
There is a gasket of (stainless steel).

A metal gasket having a rhombic cross section has a straight-line shape, so that it is easy to machine, that is, easy to manufacture.

The metal gasket having a rhombic cross section has triangular protrusions on both sides in contact with the flange surface, and a circular peak formed by connecting the vertices of the triangle is joined to the flange surface. . In other words, the circular peak formed by connecting the vertices of the triangle is crushed in accordance with the tightening pressure when the flange is tightened by the bolt, and exhibits a sealing effect. Depending on the material hardness of the flange, if the flange and the metal gasket are of the same material (for example, stainless steel), the circular peak of the metal gasket will be crushed, and at the same time, a concave due to the circular peak will be formed on the flange surface. The metal gasket can be re-installed at the original position without shifting the position of the metal gasket when reassembling and assembling the flange.

On the other hand, since a metal gasket having a rhombic cross section does not have a hollow structure, the tightening torque at the time of joining with a flange can be adjusted in the same manner as that of a conventional flat gasket. There are few adjustment difficulties.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view, a side view and a sectional view of a seal member used for a high-temperature pipe flange according to an embodiment of the present invention. A seal member 1 used for a high-temperature pipe flange in the drawing has a protrusion 2 connected in a ring shape on a surface in contact with the flange. As shown in the side view, the protrusion 2 exists on both side surfaces. The cross section taken along line AA of the plan view is AA
It is sectional drawing, and the cross-sectional shape of the sealing member 1 is a rhombus.
FIG. 2 shows how the seal member 1 is incorporated between the flanges 3 and 4. Note that a high-temperature gas flows in the high-temperature pipe 21. For example, a gas at 700 ° C. or higher flows. As the gas, a gas through which a combustion gas flows can be used. Here, the materials of the seal member 1, the flanges 3 and the flanges 4 are all SUS304.

When the sealing member 1 is sandwiched between the flanges 3 and 4 and is fastened with a plurality of bolts 5 and nuts 6, the projection 2 of the sealing member 1
And the surface 8 of the flange 4
It collapses and exhibits a sealing effect.

According to this embodiment, since the seal member can be manufactured by linear processing on a lathe, an inexpensive seal member can be provided. Although the cross section of the seal member shown in FIGS. 1 and 2 is rhombic, the shapes of the protrusions 9 and 10 that do not contact the flange surface are not limited to those shown in the drawings, and may be any shape.

FIG. 3 is a view showing a seal member used for a high-temperature pipe flange according to another embodiment of the present invention, which is a modification of FIG. 1 described above. Therefore, in the following description, FIG.
Only the differences from the above will be described.

In this embodiment, two protrusions 2 are provided on one surface of the seal member 1 which is in contact with the flange surface. The diameters of the two protrusions 2 have a relationship of “diameter a <diameter b”. Therefore, the valley portion 11 exists between the diameter a and the diameter b, and has a “double mountain structure”. The other surface of the seal member 1 which is in contact with the flange surface is shown in FIG.
And the diameter of the protruding portion 2 is c, the relationship is "diameter a <diameter c <diameter b". When the seal member 1 is sandwiched between the flanges and tightened with a plurality of bolts and nuts, the protrusion 2 of the seal member 1 is inserted into the opposed flange surface, and at the same time, the protrusion 2 is crushed to exhibit a sealing effect.

According to this embodiment, the seal member has a projection on one side and a projection having an intermediate diameter between the two sides on the other surface. Since the cross section of the member is corrugated, when the seal member is tightened by the flange, the sealing force is improved by the elastic force of the corrugated cross section, and the reliability against leakage is increased.

[0017]

According to the present invention, since a sealing member having a rhombic cross-sectional shape composed of straight lines is used, it is easy to manufacture, high-temperature piping which can be re-installed on the flange surface, and whose tightening adjustment is simple. A seal member used for the flange can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a seal member used for a high-temperature pipe flange according to an embodiment of the present invention.

FIG. 2 is a side view in which a sealing member used for a high-temperature pipe flange according to an embodiment of the present invention is incorporated in the flange.

FIG. 3 is an explanatory diagram of a seal member used for a high-temperature pipe flange according to the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Seal member, 2 ... Protrusion, 3, 4 ... Flange, 5 ... Bolt, 6 ... Nut, 7, 8 ... Flange surface, 9, 10 ... Protrusion, 11 ... Valley.

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Megumi Suno 3-1-1, Sakaimachi, Hitachi City, Ibaraki Prefecture Inside the Hitachi Plant, Hitachi, Ltd.

Claims (4)

[Claims] 1. A sealing member for a high-temperature pipe flange for guiding a high-temperature combustion gas or the like, wherein the sealing member has a rhombic cross-sectional shape in a pipe axial direction. 2. A high-temperature pipe flange sealing member according to claim 1, wherein said sealing member is made of metal. 3. A seal member for use in a high-temperature pipe flange for introducing a high-temperature combustion gas or the like, wherein a plurality of annular projections having different diameters are provided over the entire circumference of a contact surface of the seal member in contact with the flange. Characteristic seal member for high temperature piping flange. 4. The sealing member according to claim 3, wherein a plurality of annular projections having different diameters are provided over the entire circumference of one contact surface of the seal member in contact with the flange, and the entire circumference of the other contact surface of the seal member is provided. A high-temperature pipe flange sealing member in which the size of the diameter c of the annular projection is set between the diameters a and b of the two annular projections.