TWI814993B - Zigzag metal gaskets vs. tank profile gaskets - Google Patents

Abstract

A zigzag metal gasket and a can profile gasket having the zigzag metal gasket. The zigzag metal gasket is connected to concentric zigzag concave and convex portions 1a and 1b on both sides to form the zigzag concave and convex portions. The distance between the convex parts 3 of 1a and 1b is 1.2~1.8mm. A flat part L with a width of 50~180 μm is formed on the top part T of the convex part 3. The depth of the recessed part 4 constituting the zigzag-shaped concave and convex parts 1a and 1b is 0.3~1.8 mm. 0.8mm, and form an arc with a radius of 0.2~0.6mm at the bottom B of the recess.

Description

Zigzag metal gaskets vs. tank profile gaskets

The invention relates to a zigzag metal gasket. To explain in more detail, the present invention relates to a zigzag metal gasket and a can profile gasket having the zigzag metal gasket. The zigzag metal gasket of the present invention and the tank profile gasket having the zigzag metal gasket can be suitably used in pipe flanges, towers, tanks, and heat exchangers that use fluids such as water vapor with high temperature and high pressure. Appliances, pressure cookers, valve bonnets, metal sealing mechanisms, etc.

In order to improve the sealing efficiency, zigzag gaskets have concentric zigzag-shaped concave and convex portions formed on both sides of the gasket to reduce the effective contact area with flanges, etc. Zigzag gaskets are generally used for valve bonnets, pipe flanges, cover gaskets of pressure vessels, etc.

As a zigzag gasket with a high cost reduction effect, a zigzag gasket is proposed which is inserted between the first flange member and the second flange member and is formed on the gasket body. The zigzag-shaped concave and convex parts respectively bite into the sealing surface on the first flange member side and the sealing surface on the and second flange member sides, thereby exerting sealing properties. In the zigzag gasket, the gasket body It is composed of a metal sealing portion body forming the zigzag-shaped concave and convex portion, and a metal positioning portion formed on the outer peripheral side of the sealing portion body. The positioning portion is composed of a plurality of divided bodies divided in the circumferential direction. structure (for example, refer to Patent Document 1).

In addition, in a gasket having a flake layer of expanded graphite or the like, a zigzag gasket having a flake layer is proposed as a gasket that can prevent fine particles of the flake layer of expanded graphite or the like that are generated when the gasket is broken during compression from flowing into the fluid passage. A zigzag-shaped gasket with a lamella layer, which includes: a gasket body having concentric zigzag-shaped concave and convex portions formed on both sides; and a lamella layer that is laminated to cover the zigzag-shaped concave and convex portions. The gasket body and the sheet layer are installed in an integrated state between the joint parts of the fluid passage. When the first member and the second member constituting the joint part are locked, the sawtooth passes through the sheet layer. The concave-convex portions of the shape bite into the first member and the second member, thereby exerting sealing force. The zigzag-shaped gasket with the sheet layer will move from the zigzag-shaped concave and convex portions closest to the fluid passage. The distance from the first convex part to the second closest convex part is regarded as a, and it will be from the 2nd convex part to the 3rd convex part, from the 3rd convex part to the 4th convex part, and from the 4th convex part to the 4th convex part. 5. When the distance from the n-1th convex part to the n-th convex part is regarded as b, it is a≧2b. The radially inner end of the sheet layer is disposed between the first convex part and the second convex part. between convex portions (for example, refer to Patent Document 2).

The zigzag gasket has an excellent cost reduction effect, and the zigzag gasket having a lamella layer has an excellent effect of preventing particles from the lamella layer that are broken when the gasket is compressed from flowing into the fluid passage.

In recent years, tank profile gaskets have been installed between flanges of piping. Even when high-pressure fluid is introduced into the piping, in order to prevent leakage of fluid from between the flanges, the surface between the flanges is required. The pressure is 80 MPa or more, and it is desired to develop a can profile gasket that is excellent in durability and sealing performance even at this surface pressure.

However, in the tank profile gasket represented by the conventional zigzag gasket having a thin sheet layer, when the thickness of the sheet layer is 0.6 to 1.5 mm, for example, the tank profile gasket is installed between the flanges of the pipe. , when the flange is locked so that the surface pressure of the tank contour gasket in contact with the flange becomes 80 MPa or more, the thickness of the sheet layer existing on the convex part of the zigzag gasket cannot be fully achieved. To ensure the sealing between the convex part and the flange of the zigzag gasket. [Prior patent documents] [Patent Document]

[Patent Document 1] Japanese Patent No. 4842023 [Patent Document 2] Japanese Patent No. 4877673

[Problem to be solved by the invention]

The present invention was developed in view of this conventional technology, and its subject is to provide a can profile gasket and a zigzag metal gasket suitable for use in the can profile gasket. The can profile gasket has an elastic sheet with a thickness of The 0.6~1.5mm tank profile gasket is installed between the flanges of the piping. Even when the flanges are locked, the surface pressure of the tank profile gasket in contact with the flange becomes 80MPa or more. It also ensures sufficient sealing between the convex portion and the flange of the zigzag gasket, and has excellent durability against this surface pressure. [Means to solve the problem]

The present invention relates to (1) a zigzag-shaped metal gasket, which has concentric zigzag-shaped concave and convex portions formed on both sides. The spacing between the convex portions constituting the zigzag-shaped concave and convex portions is 1.2 to 1.8 mm. The top portion of the convex portion forms a flat portion with a width of 50 to 180 μm. The depth of the concave portion constituting the zigzag-shaped concave and convex portion is 0.3 to 0.8 mm, and an arc with a radius of 0.2 to 0.6 mm is formed at the bottom of the concave portion. ; (2) The zigzag metal gasket of item (1), in which the cross-sectional groove area of the concave portion constituting the jagged concave and convex portion is 0.25~0.80mm ² ; and (3) a can profile gasket, It is made by having a zigzag metal gasket as in item (1) or (2), and pasting an elastic sheet with a thickness of 0.6~1.5mm on the jagged concave and convex parts formed on both sides of the zigzag metal gasket. . [Effects of the invention]

According to the present invention, there is provided a can profile gasket and a zigzag metal gasket suitable for the can profile gasket. The can profile gasket is a can profile gasket with an elastic sheet thickness of 0.6~1.5mm. Between the flanges of the piping, even when the flanges are locked so that the surface pressure of the tank contour gasket in contact with the flange becomes 80 MPa or more, the zigzag gasket can be fully secured. The sealing between the convex part and the flange is excellent, and the durability under this surface pressure is excellent.

The zigzag metal gasket of the present invention is a metal gasket in which concentric zigzag-shaped concave and convex portions are formed on both sides of the zigzag metal gasket.

The zigzag-shaped metal gasket of the present invention is characterized by: the pitch between the convex portions constituting the zigzag-shaped concave and convex portions is 1.2 to 1.8 mm, and a flat portion with a width of 50 to 180 μm is formed on the top of the convex portions to form the zigzag shape. The depth of the concave part of the concave and convex part is 0.3~0.8mm, and an arc with a radius of 0.2~0.8mm is formed at the bottom of the concave part.

Since the zigzag metal gasket of the present invention has this structure, it is excellent in durability and sealing performance even if the surface pressure when locked to a flange or the like is 80 MPa.

Hereinafter, the zigzag metal gasket of the present invention will be described in detail based on the drawings. However, the present invention is not limited to the embodiment described only in the drawings.

FIG. 1 is a schematic plan view showing one embodiment of the zigzag metal gasket of the present invention. FIG. 2 is a schematic cross-sectional view of the zigzag metal gasket shown in FIG. 1 at part AA. FIG. 3 is a partial enlarged view of the zigzag-shaped concave and convex portions shown in the cross-sectional view of the zigzag metal gasket in FIG. 2 .

As shown in FIG. 1 , the zigzag metal gasket 1 of the present invention has a concentric zigzag-shaped concave and convex portion 1 a and a flat plate-shaped flange portion 2 formed integrally with the concave and convex portion 1 a. The planar shape is disc-shaped.

The material of the zigzag metal gasket 1 varies depending on the use of the zigzag metal gasket 1, so it cannot be determined uniformly. It is better to determine it appropriately according to the use. The material of the zigzag metal gasket 1 is made from aluminum, aluminum alloy, stainless steel, inconel, carbon steel, lead, gold, silver, The metal selected from the group consisting of copper, nickel, tantalum, chromium molybdenum steel, monel alloy (monel), titanium and magnesium alloy is preferably selected from the group consisting of aluminum, aluminum alloy, stainless steel and Inconel. Preferably, aluminum or stainless steel is better.

Examples of aluminum alloys include aluminum-iron alloys, aluminum-copper alloys, aluminum-manganese alloys, aluminum-magnesium alloys, aluminum-zinc alloys, aluminum-nickel alloys, etc., but the present invention is not limited to these examples.

Examples of stainless steel include SUS304, SUS316, SUS430, SUS630, SUS631, SUS633, SUS420J2, etc., but the present invention is not limited to only these examples.

In addition, examples of metals other than magnesium used in magnesium alloys include lithium, calcium, aluminum, zinc, titanium, manganese, zirconium, yttrium, tantalum, neodymium, niobium, etc., but the present invention does not Limited to this example only.

In the schematic plan view of the zigzag metal gasket 1 shown in Figure 1, the outer diameter of the zigzag metal gasket 1 and the inner diameter of the central opening vary depending on the use of the zigzag metal gasket 1, etc. Therefore, it cannot be determined uniformly. It is better to determine appropriately according to the use of the zigzag metal gasket 1 . In the schematic cross-sectional view of the zigzag metal gasket shown in FIG. 2, the thickness t (thickness of the flange portion) of the zigzag metal gasket 1 varies depending on the use of the zigzag metal gasket 1, etc., so it cannot be determined. It is better to determine it uniformly and appropriately according to the purpose of the zigzag metal gasket 1, generally about 1.5~15mm.

The planar shape of the zigzag metal gasket 1 shown in Figure 1 is circular. The circle is not only a perfect circle, but also includes the concepts of vertical oval, transverse oval and track oval. The planar shape of the zigzag metal gasket 1 can be appropriately determined according to the use of the zigzag metal gasket 1 .

As shown in FIG. 2 , concentric zigzag-shaped concave and convex portions 1 a and 1 b are respectively formed on both sides of the zigzag metal gasket 1 . A plurality of zigzag-shaped concave and convex portions 1 a and 1 b are provided concentrically in the diameter direction of the zigzag-shaped metal gasket 1 .

As shown in Fig. 3, a zigzag-shaped concave and convex portion 1a is formed on the upper surface of the zigzag-shaped metal gasket 1 shown in Fig. 2. A flat portion L is formed in the radial direction of the zigzag metal gasket 1 on the top portion T of the convex portion 3 constituting the zigzag-shaped concave and convex portion 1a. Therefore, the convex portion 3 has a trapezoidal cross-sectional shape as shown in FIG. 3 . The flat portion L is a plane formed in a direction parallel to the diameter of the zigzag metal gasket 1. However, within the scope that does not hinder the purpose of the present invention, it may not be formed in a parallel direction to the diameter of the zigzag metal gasket 1. Has a taper. The shape of the zigzag-shaped concave and convex portion 1b formed on the lower surface of the zigzag-shaped metal gasket 1 shown in Fig. 2 is preferably the same as the shape of the zigzag-shaped concave and convex portion 1a formed on the upper surface.

In FIG. 3 , the width W of the flat portion L formed on the top portion T of the convex portion 3 (the width in the diameter direction of the zigzag metal gasket 1 ) is, for example, the same as that between two flanges. The zigzag metal gasket 1 has the zigzag concave and convex portions 1a and 1b and is related to the locking pressure when a can profile gasket with an elastic sheet (not shown) is pasted and locked, but it depends on the top portion T of the convex portion 3 The formed flat portion L prevents the elastic piece from breaking and improves the sealing performance of the zigzag metal gasket 1, and is 50 to 180 μm, preferably 60 to 150 μm, and more preferably 80 to 120 μm. The width (not shown) of the flat portion L formed on the top of the zigzag-shaped concave and convex portion 1b is preferably the same as the width W. The zigzag-shaped concave and convex portion 1b is formed on the zigzag-shaped metal pad shown in Figure 2 Formed below sheet 1.

In FIG. 3 , the pitch P between the convex portions 3 constituting the zigzag-shaped concave and convex portion 1 a of the zigzag metal gasket 1 is between the center of the flat portion L formed by the top portion T of the convex portion 3 and the convex portion 3 The centers of the flat portions L formed by the top portions T of other adjacent convex portions 3 are spaced apart from each other. The distance P between the convex portion 3 and other convex portions 3 adjacent to the convex portion 3 is generally a fixed value for each of the plurality of concave and convex portions 1a, but it may not be a fixed value within the scope that does not hinder the purpose of the present invention. exist. The distance P is 1.2~1.8mm from the perspective of improving the sealing performance of the zigzag metal gasket 1. The pitch (not shown) of the convex portions 3 constituting the zigzag-shaped concave and convex portions 1b formed on the lower surface of the zigzag-shaped metal gasket 1 shown in FIG. 2 is preferably the same as the pitch P.

In Figure 3, the depth D of the convex portion 3 constituting the zigzag-shaped concave and convex portion 1a of the zigzag-shaped metal gasket 1 is measured from the deepest position (the deepest position) of the concave portion 4 constituting the zigzag-shaped concave and convex portion 1a of the zigzag-shaped metal gasket 1. The height from the bottom) B to the top T of the convex part 3. From the perspective of improving the sealing performance of the zigzag metal gasket 1, the depth D is 0.3~0.8mm, preferably 0.4~0.75mm. The depth (not shown) of the protrusion formed on the lower surface of the zigzag metal gasket 1 shown in FIG. 2 is preferably the same as the depth D.

In FIG. 3 , the bottommost part B of the concave portion 4 constituting the zigzag-shaped concave and convex portion 1 a of the zigzag metal gasket 1 forms an arc in the diameter direction of the zigzag metal gasket 1 . Therefore, the recessed portion 4 has an approximately inverted trapezoidal cross-sectional shape having an arc at the bottom portion B. From the perspective of improving the sealing performance of the zigzag metal gasket 1, the radius of the arc is 0.2~0.6mm, preferably 0.3~0.5mm. The shape of the bottommost portion of the recessed portion formed in the zigzag-shaped concave and convex portion 1b of the zigzag-shaped metal gasket 1 shown in FIG. 2 is preferably the same as the shape of the bottommost portion B of the recessed portion 4.

In Figure 3, the cross-sectional groove area of the recessed portion 4 constituting the zigzag-shaped concave and convex portion 1a is preferably 0.25~ ^0.80mm2 , and 0.28~0.72mm from the perspective of improving the sealing performance of the zigzag-shaped metal gasket 1. ² is better. The groove area is the cross-sectional area of the space surrounded by the straight line and the concave portion 4 in FIG. The flat portion L is formed by the top portion T of the other convex portion 3 . The cross-sectional groove area of the recessed portions 4 constituting the zigzag-shaped concave and convex portions 1a and 1b is a test piece having the groove shape of the space portion, and the volume of the test piece is calculated based on the mass and density of the test piece, and then The value obtained by dividing the volume of the test piece by the thickness of the test piece. The cross-sectional groove area of the recessed portion (not shown) constituting the zigzag-shaped concave and convex portion 1b of the zigzag-shaped metal gasket 1 shown in FIG. 2 is preferably the same as the cross-sectional groove area of the recessed portion 4.

In FIG. 3 , the angle θ between the inclined surfaces adjacent to the concave portion 4 constituting the zigzag-shaped concave and convex portion 1 a is not particularly limited, but from the viewpoint of improving the sealing performance of the zigzag-shaped metal gasket 1 , it is preferably 60 to 120 degrees. °, preferably 80~100°, more preferably 85~95°. It is preferable that the included angle (not shown) of the inclined surface adjacent to the concave portion constituting the zigzag-shaped concave and convex portion 1b of the zigzag-shaped metal gasket 1 shown in FIG. 2 is the same as the angle θ.

In FIG. 3 , the convex portion 3 formed on the zigzag-shaped concave and convex portion 1 a protrudes only by a height H from the flat-plate flange portion 2 in order to improve the sealing performance of the zigzag-shaped metal gasket 1 . The height H of the convex portion 3 from the flat flange portion 2 is preferably 0.3 to 0.8 mm, and more preferably 0.4 to 0.75 mm, from the perspective of improving the sealing performance of the zigzag metal gasket 1 . The height (not shown) of the zigzag convex portion of the zigzag metal gasket 1 shown in FIG. 2 from the flat flange portion 2 is preferably the same as the height H.

In FIG. 3 , the number of convex portions 3 formed in the zigzag-shaped concave and convex portion 1 a varies depending on the use of the zigzag metal gasket 1 , etc., so it cannot be determined uniformly. 1. From the perspective of sealing, at least 3 is better, and at least 5 is better. In addition, the upper limit of the number of convex portions 3 cannot be determined uniformly because it varies depending on the use of the zigzag metal gasket 1, but is generally about 10. It is preferable that the number of convex portions formed by the zigzag-shaped concave and convex portions 1b of the zigzag-shaped metal gasket 1 shown in FIG. 2 is the same as the number of the convex portions 3 .

The zigzag-shaped concave and convex portions 1a and 1b of the zigzag-shaped metal gasket 1 shown in FIG. 2 can be formed by cutting the metal gasket using a lathe or the like, for example.

When the zigzag metal gasket 1 obtained in the above manner is used as a can profile gasket, the sealing property with flanges and the like can be improved, so it can be suitably used for the can profile gasket.

Hereinafter, the can profile gasket of the present invention will be described in detail based on the drawings. However, the present invention is not limited only to the embodiment described in the drawings.

Fig. 4 is a schematic plan view showing one embodiment of the can profile gasket of the present invention. Fig. 5 is a schematic cross-sectional view of the tank profile gasket shown in Fig. 4 at part B-B.

The can profile gasket 5 of the present invention is as shown in Figure 4. It is characterized by having a zigzag metal gasket 1, and the elastic sheet 6 is adhered to the jagged concave and convex formed on both sides of the zigzag metal gasket 1. Department (not shown).

Since the tank profile gasket 5 has this structure, for example, when the tank profile gasket 5 is sandwiched between two flanges and locked, a part of the elastic piece 6 enters the saw teeth formed in FIGS. 2 and 3 The concave portion 4 of the zigzag-shaped concave and convex portions 1a and 1b formed on both sides of the metal gasket 1 improves sealing performance because the surface pressure on the elastic piece 6 becomes higher. The elastic piece 6 is present in the convex portion 3 The flat part L formed by the top part T.

From the viewpoint of improving the sealing performance and mechanical strength of the elastic sheet 6, the elastic sheet 6 is preferably an elastic sheet 6 containing an organic binder and inorganic powder.

From the viewpoint of improving the sealing performance and mechanical strength of the elastic piece 6, organic adhesive is a preferred rubber adhesive. Examples of the rubber adhesive include acrylonitrile-butadiene rubber, natural rubber, isoprene rubber, chloroprene rubber, acrylonitrile rubber, styrene-butadiene rubber, butadiene rubber, base rubber, fluororubber, silicone rubber, ethylene-propylene rubber, etc., but the present invention is not limited to these examples. These rubber adhesive systems may be used individually, or two or more types may be used in combination.

The content rate of the organic binder in the elastic sheet 6 is preferably 5 mass% or more, more preferably 10 mass% or more, and more preferably 15 mass% or more, from the perspective of improving the sealing property of the elastic sheet 6. Preferably, it is 20 mass % or more, and from the viewpoint of improving the heat resistance of the elastic sheet 6, it is preferably 97 mass % or less, more preferably 95 mass % or less, and more preferably 90 mass % or less. Therefore, the content rate of the organic binder in the elastic sheet 6 is preferably 5 to 97 mass %, more preferably 10 to 95 mass %, more preferably 15 to 90 mass %, and still more preferably 20 to 90 mass %. .

The inorganic powder system has the property of improving the flexibility of the elastic sheet 6 and the shape retention of the elastic sheet 6 at high temperatures. The inorganic powder system is difficult to disappear and remains even if the elastic sheet 6 is heated to a high temperature, so it can improve the sealing performance of the can profile gasket 5 of the present invention.

Examples of the inorganic powder include talc, barium sulfate powder, clay, mica powder, titanium oxide powder, aluminum oxide powder, zinc oxide powder, magnesium oxide powder, silicate powder, silica powder, calcium carbonate powder, and sodium carbonate. powder, calcium hydroxide powder, aluminum hydroxide powder, magnesium carbonate powder, graphite powder, metal powder, glass powder, etc., but the present invention is not limited to these examples. These inorganic powder systems may be used individually, or two or more types may be used in combination.

The average particle size of the inorganic powder is preferably 2 μm or more from the viewpoint of improving the shape maintainability of the elastic sheet 6, and is preferably 25 μm or less from the viewpoint of improving sealing properties. In addition, the particle size of the inorganic powder is the value measured using a laser diffraction particle size distribution measuring device, and the average particle size of the inorganic powder is the particle size measured using the laser diffraction particle size distribution measuring device. Distribution, the value of the particle diameter (median diameter) when the cumulative number of particles of inorganic powder is 50%.

From the viewpoint of improving the heat resistance of the elastic sheet 6, the content rate of the inorganic powder in the elastic sheet 6 is preferably 3 mass% or more, more preferably 5 mass% or more, and more preferably 10 mass% or more. From the viewpoint of the sealing property of the elastic sheet 6, it is preferably 95 mass % or less, more preferably 90 mass % or less, more preferably 85 mass % or less, still more preferably 80 mass % or less. Therefore, the content rate of the inorganic powder in the elastic sheet 6 is preferably 3 to 95 mass %, more preferably 5 to 90 mass %, more preferably 10 to 85 mass %, and still more preferably 10 to 80 mass %. .

The elastic sheet 6 may also contain fibers from the viewpoint of improving the mechanical strength and flexibility of the elastic sheet 6 . As fibers, the series includes inorganic fibers and organic fibers.

Examples of inorganic fibers include alumina fiber, glass fiber, zirconia fiber, rock wool, basalt fiber, biosoluble fiber, silica fiber, ceramic fiber, etc. However, the present invention is not limited to is limited to this example. These inorganic fiber systems may be used individually, or two or more types may be used in combination.

Examples of organic fibers include synthetic fibers such as polyamide fiber, aramid fiber, polyester fiber, polyurethane fiber, polyethylene fiber, acrylic fiber, and polyvinyl alcohol fiber; cotton, hemp, cellulose fiber, etc. Plant fibers; animal fibers such as wool; carbon fibers; regenerated fibers such as rayon; however, the present invention is not limited to this example. These organic fiber systems may be used individually, or two or more types may be used in combination.

From the viewpoint of improving the mechanical strength of the elastic sheet 6, the average fiber diameter of the fibers is preferably 3 to 20 μm. The fiber length of the fiber is preferably 0.01 mm or more, and preferably 0.1 to 20 mm, from the viewpoint of improving dispersion in the elastic sheet 6 and improving the mechanical strength of the elastic sheet 6 . In addition, the average fiber diameter of a fiber is a value obtained by measuring the fiber diameters of fibers included in an image captured using a scanning electron microscope and obtaining the average value of the fiber diameters of the fibers.

The fiber content of the elastic sheet 6 is preferably 3 mass % or more from the perspective of improving the mechanical strength of the elastic sheet 6 , more preferably 5 mass % or more. From the perspective of improving the sealing property of the elastic sheet 6 , it is Preferably, it is 30 mass% or less, more preferably, it is 20 mass% or less, and still more preferably, it is 10 mass% or less. Therefore, the fiber content in the elastic sheet 6 is preferably 30 mass% or less, more preferably 3 to 30 mass%, more preferably 5 to 20 mass%, and still more preferably 5 to 10 mass%.

The manufacturing method of the elastic piece 6 is not particularly limited. The elastic sheet 6 can be produced by, for example, mixing ingredients such as an organic binder, inorganic powder, fiber if necessary, and an organic solvent into a uniform composition, and then molding the resulting mixture into a predetermined shape.

From the viewpoint of improving sealing performance and mechanical strength, the density of the elastic sheet 6 is preferably 0.8 to 1.2 g/cm ³ , and preferably 0.9 to 1.1 g/cm ³ .

The thickness of the elastic piece 6 is also related to the locking pressure when the can profile gasket 5 is sandwiched between the two flanges and locked. From the perspective of breaking the elastic piece 6 and improving the sealing performance, 0.6~1.5mm is preferred, and 0.8~1.2mm is more preferred.

The elastic piece 6 is generally adhered to both sides of the zigzag metal gasket 1 in a manner that covers the zigzag-shaped concave and convex portions 1a, 1b formed on both sides of the zigzag metal gasket 1. The elastic sheet 6 can be adhered using adhesive, double-sided tape, etc., for example. Examples of the adhesive include rubber-based adhesives, but the present invention is not limited to this example.

The tank profile gasket 5 constructed in the above manner according to the present invention is sandwiched between two flanges, even if the surface pressure during locking of the tank profile gasket 5 has been adjusted to a high pressure of 80 MPa or more. The elastic sheet 6 is present in a thin layer on the flat portion L formed on the top portion T of the convex portion 3 attached to both sides of the zigzag metal gasket 1 used for the tank outline gasket 5. form. For example, when using an elastic sheet 6 with a thickness of about 0.8 to 1.5 mm, clamp the can profile gasket 5 between two flanges and lock the can profile gasket 5 into the locking state of the can profile gasket 5 When the surface pressure becomes 80 MPa or more, the thickness of the elastic sheet 6 present in the flat part L formed on the top part T of the convex part 3 becomes a thin layer of about 0.05~0.1 mm, because the thin layer of the elastic sheet 6 penetrates The amount of fluid is very small, so the sealing performance can be improved.

In addition, the heat-resistant elastic sheet 6 generally used in the can outline gasket is used in order to impart heat resistance, for example, an inorganic filler containing a large amount of talc or the like is used. When the heat-resistant elastic sheet has a high content of inorganic filler, the amount of fluid passing through the heat-resistant elastic sheet increases compared to an elastic sheet that does not contain the inorganic filler. Therefore, it is necessary to increase the gasket strength. Surface pressure during locking.

Correspondingly, the can profile gasket 5 of the present invention is sandwiched between two flanges, and the surface pressure when locking the can profile gasket 5 is adjusted to a high pressure of 80 MPa or more, because the elastic sheet 6 is in a thin layer The state exists in the flat part L formed on the top part T of the convex part 3. The convex part 3 is formed on both sides of the zigzag metal gasket 1 used for the tank outline gasket 5, so the zigzag metal gasket The elastic piece 6 makes it difficult for the flange to be exposed, thereby preventing damage to the flange caused by the exposure of the zigzag metal gasket 1 .

Therefore, when the tank profile gasket 5 of the present invention is installed between the flanges of the pipe, even when the flanges are locked, the surface pressure on the surface of the tank profile gasket 5 that contacts the flanges becomes 80 MPa. In the above case, the sealing performance between the convex portion 3 and the flange of the zigzag metal gasket 1 can be fully ensured, so the can profile gasket 5 of the present invention has excellent durability under this surface pressure. Therefore, the tank profile gasket 5 of the present invention is suitable for use with fluids having high temperature and high pressure, so it can be suitably used for high temperature applications. Tank profile gaskets for high pressure. The high temperature. High-pressure tank profile gaskets are used on pipe flanges, towers, tanks, heat exchangers, pressure cookers, valve bonnets, metal sealing mechanisms, etc. that use fluids with high temperature and high pressure such as water vapor.

From the above, the tank profile gasket 5 using the zigzag metal gasket 1 of the present invention is used, for example, in thermal power plants, nuclear power plants, steam engines of steam turbine ships, petroleum refining production lines, petrochemical industry processing production lines, and semiconductor manufacturing production lines. It can be suitably used when connecting pipes that use high-temperature and high-pressure fluids. [Example]

Next, the present invention will be described in detail based on examples. However, the present invention is not limited to only the examples. Examples 1 to 14 and Comparative Examples 1 to 6

A metal gasket made of stainless steel (SUS316) (outer diameter: 110mm, inner diameter of the central opening: 75mm) is cut with a lathe to produce a zigzag shape as shown in Figures 1 to 3 Metal gasket 1 (outer diameter of the concentric zigzag concave and convex parts: 90mm, inner diameter: 75mm, thickness of the flange part: 2mm, angle between the adjacent inclined surfaces of the concave parts: 90°). Table 1 shows the details of the uneven portions formed on the zigzag metal gasket 1 .

The annular elastic sheet 6 is adhered to the surface of the concentric zigzag-shaped concave and convex portions formed on both sides of the zigzag-shaped metal gasket 1 obtained above with an adhesive (styrene-butadiene rubber adhesive) [ Outer diameter: 90mm, inner diameter of the central opening: 75mm, thickness: 0.9mm, material: organic binder (acrylonitrile-butadiene rubber), inorganic powder (talc) and fiber (alumina fiber and Cellulose fiber), density: 1g/cm ³ ], thereby producing a tank contour gasket 5. In addition, in Example 13, the thickness of the elastic piece 6 was changed to 0.8 mm, and in Example 14, the thickness of the elastic piece 6 was changed to 1.2 mm.

Next, as an indicator of the sealing performance and durability when locking with high surface pressure using the can profile gasket 5 obtained above, the elastic piece 6 of the convex portion formed in the zigzag-shaped concave and convex portion was investigated and evaluated according to the following method. The adhesion condition and the thickness of the elastic sheet 6. The results are shown in Table 1. [Tight sealing during high surface pressure locking]

Clamp the tank profile gasket 5 between the flanges of the pipe, and lock the flanges by adjusting the locking surface pressure to 100MPa.

Next, nitrogen gas at 25°C is introduced into the pipe, and the internal pressure of the pipe is adjusted to 4MPa. The nitrogen leakage is measured according to the submersion test method, and the sealing performance during high surface pressure locking is evaluated based on the following evaluation criteria. The results are recorded in the "Tightness" column of Table 1. In addition, the measurement limit when measuring nitrogen leakage is 1.7×10 ^{- 5} Pa. m ³ /s.

(Evaluation criteria) S: The leakage amount of nitrogen is 1.7×10 ^{- 5} Pa. m ³ /s or less (qualified). ◎: The leakage amount of nitrogen exceeds 1.7×10 ^{- 5} Pa. m ³ /s, and 1.7×10 ^{- 4} Pa. m ³ /s or less (qualified). ○: The leakage amount of nitrogen exceeds 1.7×10 ^{- 4} Pa. m ³ /s, and 1.7×10 ^{- 3} Pa. m ³ /s or less (qualified). △: The leakage amount of nitrogen gas exceeds 1.7×10 ^{- 3} Pa. m ³ /s, and 1.7×10 ^{- 2} Pa. m ³ /s or less (unqualified). ×: The leakage amount of nitrogen gas exceeds 1.7×10 ^{- 2} Pa. m ³ /s (unqualified). (The adhesion status of the elastic piece on the convex part)

After the above-mentioned evaluation of sealing performance during high surface pressure locking, remove the can profile gasket 5 from the flange.

Visually observe the elastic sheet attached to the can contour gasket, and evaluate the adhesion status of the elastic sheet to the convex portion based on the following evaluation criteria. The results are described in the "Adhesion status of the elastic sheet" column of Table 1.

(Evaluation Basis) ○: There is no abnormality in the elastic sheet. ×: The elastic piece is cracked. [Thickness of the elastic piece on the convex part]

The thickness of the elastic sheet attached to the convex part is measured by using a micrometer to determine the adhesion condition of the elastic sheet to the convex part, and the thickness of the elastic sheet attached to the convex part is evaluated based on the following evaluation criteria. The results are recorded in the "thickness of elastic sheet" column of Table 1.

(Evaluation Basis) ◎: The thickness of the elastic sheet attached to the convex part is 150 μm or less (passed). ○: The thickness of the elastic sheet attached to the convex part is more than 150 μm and 200 μm or less (passed). ×: The thickness of the elastic sheet attached to the convex portion exceeds 200 μm (unsatisfactory).

[Table 1] Example, comparative example number The concave and convex parts formed by the zigzag metal gasket Evaluation of physical properties Pitch between convex parts P(mm) Width of flat portion W (μm) concavity Groove area (mm ² ) Height of convex part from flange part (mm) Sealing The attachment status of the elastic sheet Thickness of elastic sheet Depth D(mm) Radius R (mm) of the bottom arc Example 1 1.5 100 0.53 0.4 0.47 0.53 S ○ ◎ Example 2 1.4 100 0.48 0.4 0.41 0.48 S ○ ◎ Example 3 1.8 100 0.73 0.4 0.71 0.73 S ○ ◎ Example 4 1.2 100 0.43 0.4 0.29 0.43 S ○ ◎ Example 5 1.5 90 0.53 0.4 0.47 0.53 S ○ ◎ Example 6 1.5 110 0.53 0.4 0.47 0.53 S ○ ◎ Example 7 1.5 70 0.53 0.4 0.47 0.53 ◎ ○ ○ Example 8 1.5 125 0.53 0.4 0.47 0.53 ◎ ○ ○ Example 9 1.5 100 0.53 0.3 0.48 0.53 S ○ ◎ Example 10 1.5 100 0.53 0.5 0.46 0.53 S ○ ◎ Example 11 1.5 100 0.53 0.25 0.49 0.53 ◎ ○ ○ Example 12 1.5 100 0.53 0.55 0.43 0.53 ◎ ○ ○ Example 13 1.5 100 0.53 0.4 0.47 0.53 S ○ ◎ Example 14 1.5 100 0.53 0.4 0.47 0.53 S ○ ◎ Comparative example 1 1.1 100 0.32 0.4 0.23 0.32 × ○ × Comparative example 2 2.0 100 0.83 0.4 0.89 0.83 △ × ◎ Comparative example 3 1.5 100 0.53 0.8 0.47 0.53 × ○ ○ Comparative example 4 1.5 100 0.53 0.1 0.47 0.53 △ ○ × Comparative example 5 1.5 40 0.53 0.4 0.47 0.53 × × ◎ Comparative example 6 1.5 200 0.53 0.4 0.47 0.53 × ○ ×

From the results shown in Table 1, it is known that the serrated metal gasket 1 and the can profile gasket obtained in each comparative example are poor in at least one of the physical properties of durability and sealing properties. The shaped metal gasket 1 and the tank profile gasket 5 series are not only excellent in sealing performance, but also excellent in durability because there is no abnormality in the elastic sheet even if the surface pressure is 100MPa.

1:Zigzag metal gasket 1a: Concave and convex parts 1b: Concave and convex parts 2: Flange part 3: convex part 4: concave part 5: Tank profile gasket 6: Elastic sheet B: The bottom of the concave part D: Depth of the concave part L: The flat part on top of the convex part T: The top of the convex part

[Fig. 1] is a schematic plan view showing one embodiment of the zigzag metal gasket of the present invention. [Fig. 2] This is a schematic cross-sectional view of the zigzag metal gasket shown in Fig. 1 at part A-A. [Fig. 3] This is a partial enlarged view of the zigzag-shaped concave and convex portions shown in the cross-sectional view of the zigzag-shaped metal gasket in Fig. 2. [Fig. 4] is a schematic plan view showing one embodiment of the can profile gasket of the present invention. [Fig. 5] A schematic cross-sectional view of the tank profile gasket shown in Fig. 4 at the B-B portion.

1:Zigzag metal gasket

1a: Concave and convex parts

2: Flange part

Claims (2)

A zigzag metal gasket, which has concentric zigzag concave and convex parts formed on both sides. The spacing between the convex parts constituting the zigzag concave and convex parts is 1.2~1.8mm, and a width is formed at the top of the convex parts. A flat portion of 50 to 180 μm, the depth of the concave portion constituting the zigzag-shaped concave and convex portion is 0.3 to 0.8mm, and an arc with a radius of 0.2 to 0.6mm is formed at the bottom of the concave portion, where the zigzag-shaped concave and convex portion is formed The groove area of the recessed part in the cross section is 0.25~0.80mm ² . A can profile gasket, which has a zigzag metal gasket as claimed in claim 1, and is made by pasting an elastic sheet with a thickness of 0.6~1.5mm on the jagged concave and convex portions formed on both sides of the zigzag metal gasket. .

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