CN113508253A - Serrated Metal Washers - Google Patents
Serrated Metal Washers Download PDFInfo
- Publication number
- CN113508253A CN113508253A CN202080017315.0A CN202080017315A CN113508253A CN 113508253 A CN113508253 A CN 113508253A CN 202080017315 A CN202080017315 A CN 202080017315A CN 113508253 A CN113508253 A CN 113508253A
- Authority
- CN
- China
- Prior art keywords
- serrated
- metal
- gasket
- zigzag
- concave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 163
- 239000002184 metal Substances 0.000 title claims abstract description 163
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- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 description 1
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- 229910052791 calcium Inorganic materials 0.000 description 1
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
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- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
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- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/08—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
- F16J15/0818—Flat gaskets
- F16J15/0825—Flat gaskets laminated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/08—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/08—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
- F16J15/0887—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing the sealing effect being obtained by elastic deformation of the packing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/08—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
- F16J15/0818—Flat gaskets
- F16J2015/085—Flat gaskets without fold over
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gasket Seals (AREA)
Abstract
一种锯齿形金属垫圈和具有该锯齿形金属垫圈的金属齿形垫，上述锯齿形金属垫圈在两面形成有同心圆状的锯齿形的凹凸部(1a)、(1b)，构成锯齿形的凹凸部(1a)、(1b)的凸部(3)的间距为1.2mm～1.8mm，在凸部(3)的顶部(T)形成有宽度为50μm～180μm的平坦部(L)，构成锯齿形的凹凸部(1a)、(1b)的凹部(4)的深度为0.3mm～0.8mm，在凹部(4)的最底部(B)形成有半径为0.2mm～0.6mm的圆弧。
A zigzag metal washer and a metal toothed washer having the zigzag metal washer, wherein the zigzag metal washer is formed with concentric zigzag concavo-convex portions (1a) and (1b) on both sides to form zigzag concavities and convexities The pitch of the convex parts (3) of the parts (1a) and (1b) is 1.2 mm to 1.8 mm, and a flat part (L) with a width of 50 μm to 180 μm is formed on the top (T) of the convex part (3), forming a serration. The depth of the concave portion (4) of the concave and convex portions (1a) and (1b) is 0.3mm to 0.8mm, and an arc with a radius of 0.2mm to 0.6mm is formed at the bottom (B) of the concave portion (4).
Description
Technical Field
The invention relates to a serrated metal washer. More particularly, the present invention relates to a serrated metal Gasket and a metal serrated pad (Kammprofile gask) having the serrated metal Gasket. The serrated metal gasket and the metal serrated pad having the serrated metal gasket of the present invention can be suitably used for, for example, a pipe flange, a tower, a tank, a heat exchanger, an autoclave, a valve cover, a metal seal mechanism, and the like, which use a fluid such as water vapor having high temperature and high pressure.
Background
In order to improve the sealing efficiency, the zigzag gasket forms concentric zigzag concave-convex parts on both surfaces of the gasket, and the effective contact area with a flange and the like is reduced. Serrated gaskets are commonly used, for example, in valve caps, pipe flanges, sealing caps for pressure vessels, and the like.
As a serrated gasket having a high cost reduction effect, a serrated gasket that is attached between a 1 st flange member and a 2 nd flange member, and that exhibits sealing properties by having serrated concave and convex portions formed on a gasket main body formed of a metallic seal portion main body formed with the serrated concave and convex portions and a metallic positioning portion formed on an outer peripheral side of the seal portion main body and formed of a plurality of split bodies split in a circumferential direction, respectively, fitted into a seal surface on the 1 st flange member side and a seal surface on the 2 nd flange member side, has been proposed (for example, see patent document 1).
Further, as a laminated zigzag gasket having a sheet layer of expanded graphite or the like and capable of preventing fine particles of the sheet layer of expanded graphite or the like generated by crushing at the time of gasket compression from entering a fluid passage, there is proposed a laminated zigzag gasket comprising a gasket main body having concentric circular zigzag uneven portions formed on both surfaces thereof and a sheet layer laminated so as to cover the zigzag uneven portions, wherein the gasket main body and the sheet layer are attached to a joint portion of the fluid passage in an integrated state, and when a 1 st member and a 2 nd member constituting the joint portion are fastened together, the zigzag uneven portions are fitted into the 1 st member and the 2 nd member via the sheet layer to exert a sealing force, wherein a distance from a 1 st protruding portion which constitutes the zigzag uneven portions and is closest to the fluid passage to a second 2 nd protruding portion is defined as a, when the distance from the 2 nd to 3 rd convex portions, from the 3 rd to 4 th convex portions, from the 4 th to 5 th convex portions, and from the n-1 th to n-th convex portions is b, a is not less than 2b, and the radially inner end of the sheet layer is disposed between the 1 st convex portion and the 2 nd convex portion (see, for example, patent document 2).
The above-described zigzag gasket has an excellent cost reduction effect, and the above-described laminated zigzag gasket has an excellent effect of preventing fine particles of the sheet layer, which are generated by crushing when the gasket is compressed, from entering the fluid passage.
In recent years, in order to prevent leakage of a fluid from between flanges even when a metal tooth gasket is attached between flanges of a pipe and a high-pressure fluid is introduced into the pipe, a surface pressure between the flanges is required to be 80MPa or more, and it is desired to develop a metal tooth gasket having excellent durability and excellent sealing property even under the surface pressure.
However, in a conventional metal tooth mat represented by a zigzag gasket with a sheet layer, when the thickness of the sheet layer is 0.6mm to 1.5mm, for example, when the metal tooth mat is attached between flanges of a pipe and fastened such that the surface pressure of the surface of the metal tooth mat in contact with the flange is 80MPa or more at the time of fastening the flange, the sheet layer thickness existing in the convex portion of the zigzag gasket is large, and therefore, it is not possible to sufficiently ensure the sealing property between the convex portion of the zigzag gasket and the flange.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 4842023
Patent document 2: japanese patent No. 4877673
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made in view of the above-mentioned conventional techniques, and an object thereof is to provide a metal tooth gasket and a serrated metal gasket that can be suitably used for the metal tooth gasket, in which the metal tooth gasket having an elastic piece with a thickness of 0.6mm to 1.5mm is attached between flanges of a pipe, and in which, even when fastening is performed such that the surface pressure of the surface where the metal tooth gasket and the flange are in contact with each other is 80MPa or more at the time of fastening the flange, the sealability between the convex portion of the serrated gasket and the flange can be sufficiently ensured, and the durability under the surface pressure is excellent.
Means for solving the problems
The present invention relates to:
(1) a serrated metal washer, it has concentric zigzag concave-convex parts on both sides, the interval of the convex part forming the above-mentioned serrated concave-convex part is 1.2 mm-1.8 mm, form the flat portion with width 50 μm-180 μm on the top of the convex part, the depth of the concave part forming the above-mentioned serrated concave-convex part is 0.3 mm-0.8 mm, form the circular arc with radius 0.2 mm-0.6 mm in the bottom of the concave part;
(2) the serrated metal washer as set forth in the above (1), wherein a groove area in a cross section of a concave portion constituting the serrated uneven portion is 0.25mm2～0.80mm2(ii) a And
(3) a metal tooth-shaped gasket comprising the zigzag metal gasket described in the above (1) or (2), wherein an elastic piece having a thickness of 0.6mm to 1.5mm is attached to a zigzag uneven portion formed on both surfaces of the zigzag metal gasket.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, there are provided a metal tooth mat and a serrated metal gasket that can be suitably used for the metal tooth mat, wherein the metal tooth mat having an elastic piece with a thickness of 0.6mm to 1.5mm is attached between flanges of a pipe, and when fastening a flange so that the surface pressure of the surface of the metal tooth mat in contact with the flange is 80MPa or more at the time of fastening the flange, the sealing property between the convex portion of the serrated gasket and the flange can be sufficiently ensured, and the durability under the surface pressure is excellent.
Drawings
Fig. 1 is a schematic top view showing one embodiment of the serrated metal washer of the present invention.
Fig. 2 is a schematic sectional view of a portion a-a of the serrated metal washer shown in fig. 1.
Fig. 3 is a partially enlarged view of a serrated concave-convex portion shown in a sectional view of the serrated metal washer of fig. 2.
FIG. 4 is a schematic top view illustrating one embodiment of a metal tooth pad of the present invention.
FIG. 5 is a schematic cross-sectional view of portion B-B of the metal tooth pad shown in FIG. 4.
Detailed Description
The zigzag metal gasket of the present invention is a metal gasket in which concentric circular zigzag uneven portions are formed on both surfaces of the zigzag metal gasket.
The zigzag metal gasket of the present invention is characterized in that the pitch of the convex portions constituting the zigzag uneven portion is 1.2mm to 1.8mm, a flat portion having a width of 50 μm to 180 μm is formed on the top of the convex portion, the depth of the concave portion constituting the zigzag uneven portion is 0.3mm to 0.8mm, and a circular arc having a radius of 0.2mm to 0.6mm is formed on the bottom of the concave portion.
The serrated metal gasket of the present invention has the above-described configuration, and therefore, has excellent durability and excellent sealing properties even when the surface pressure at fastening to a flange or the like is 80 MPa.
Hereinafter, the serrated metal gasket of the present invention will be described in detail based on the drawings, but the present invention is not limited to the embodiments shown in the drawings.
Fig. 1 is a schematic top view showing one embodiment of the serrated metal washer of the present invention. Fig. 2 is a schematic sectional view of a portion a-a of the serrated metal washer shown in fig. 1. Fig. 3 is a partially enlarged view of a serrated concave-convex portion shown in a sectional view of the serrated metal washer of fig. 2.
As shown in fig. 1, a zigzag metal gasket 1 of the present invention has a concentric zigzag uneven portion 1a and a flat plate-like flange portion 2 formed integrally with the uneven portion 1a, and has a disk-like planar shape.
The material of the serrated metal washer 1 is different depending on the application of the serrated metal washer 1, and therefore cannot be determined in general, and is preferably determined appropriately depending on the application. From the viewpoint of ensuring the sealing property by the serrated metal gasket 1, the material of the serrated metal gasket 1 is preferably a metal selected from the group consisting of aluminum, aluminum alloy, stainless steel, inconel, carbon steel, lead, gold, silver, copper, nickel, tantalum, chrome molybdenum steel, monel, titanium, and magnesium alloy, more preferably a metal selected from the group consisting of aluminum, aluminum alloy, stainless steel, and inconel, and still more preferably aluminum or stainless steel.
Examples of the aluminum alloy include an aluminum-iron alloy, an aluminum-copper alloy, an aluminum-manganese alloy, an aluminum-magnesium alloy, an aluminum-zinc alloy, and an aluminum-nickel alloy, but the present invention is not limited to the above examples.
Examples of stainless steel include SUS304, SUS316, SUS430, SUS630, SUS631, SUS633, and SUS420J2, but the present invention is not limited to these examples.
Examples of the metal other than magnesium used for the magnesium alloy include lithium, calcium, aluminum, zinc, titanium, manganese, zirconium, yttrium, tantalum, neodymium, niobium, and the like, but the present invention is not limited to the above examples.
In the schematic plan view of the serrated metal washer 1 shown in fig. 1, the outer diameter of the serrated metal washer 1 and the inner diameter of the opening in the center portion are different depending on the application of the serrated metal washer 1 and the like, and therefore cannot be determined in a general manner, and therefore, it is preferably determined appropriately depending on the application of the serrated metal washer 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 is not generally determined depending on the use of the zigzag metal gasket 1, and is preferably determined appropriately depending on the use of the zigzag metal gasket 1, and is usually about 1.5mm to 15 mm.
The planar shape of the zigzag metal gasket 1 shown in fig. 1 is circular. The circular shape is not only a perfect circle but also a circular shape including a concept of a vertically long elliptical shape, a horizontally long elliptical shape, and an elliptical trajectory shape. The planar shape of the serrated metal washer 1 may be determined as appropriate according to the use of the serrated metal washer 1.
As shown in fig. 2, concentric serrated concave and convex portions 1a and 1b are formed on both surfaces of the serrated metal gasket 1. The plural serrated uneven portions 1a and 1b are provided concentrically in the radial direction of the serrated metal washer 1.
As shown in fig. 3, a serrated concave-convex portion 1a is formed on the upper surface of the serrated metal washer 1 shown in fig. 2. A flat portion L is formed in the diameter direction of the serrated metal washer 1 at the top T of the convex portion 3 constituting the serrated uneven portion 1 a. Therefore, as shown in fig. 3, the convex portion 3 has a trapezoidal sectional shape. The flat portion L is a plane formed in a direction parallel to the diameter of the serrated metal washer 1, but may not be formed in a direction parallel to the diameter of the serrated metal washer 1 and may have an inclination (slope) within a range not to hinder the object of the present invention. The shape of the serrated concave-convex portion 1b formed on the lower surface of the serrated metal washer 1 shown in fig. 2 is preferably the same as the shape of the serrated concave-convex portion 1a formed on the upper surface thereof.
In fig. 3, the width W of the flat portion L formed on the top T of the convex portion 3 (the width in the diameter direction of the serrated metal gasket 1) is, for example, 50 μm to 180 μm, preferably 60 μm to 150 μm, and more preferably 80 μm to 120 μm, from the viewpoint of preventing the elastic piece from breaking at the flat portion L formed on the top T of the convex portion 3 and improving the sealing performance of the serrated metal gasket 1, depending on the fastening pressure when the metal serrated pad having the elastic piece (not shown) attached to the serrated uneven portions 1a and 1b of the serrated metal gasket 1 is clamped between 2 flanges and fastened. The width (not shown) of the flat portion L formed at the top of the serrated uneven portion 1b formed on the lower surface of the serrated metal washer 1 shown in fig. 2 is preferably the same as the width W.
In fig. 3, the pitch P of the convex portions 3 constituting the serrated uneven portion 1a of the serrated metal washer 1 is the interval between the center of the flat portion L formed on the top T of the convex portion 3 and the center of the flat portion L formed on the top T of another convex portion 3 adjacent to the convex portion 3. The pitch P between the convex portion 3 and another convex portion 3 adjacent to the convex portion 3 is generally constant at each of the plurality of concave and convex portions 1a, but there may be an unfixed portion within a range not interfering with the object of the present invention. The pitch P is 1.2mm to 1.8mm in order to improve the sealing performance of the zigzag metal gasket 1. The pitch (not shown) of the convex portions 3 constituting the serrated uneven portion 1b formed on the lower surface of the serrated metal washer 1 shown in fig. 2 is preferably the same as the pitch P.
In fig. 3, the depth D of the convex portion 3 constituting the serrated uneven portion 1a of the serrated metal gasket 1 is the height from the deepest position (bottommost portion) B of the concave portion 4 constituting the serrated uneven portion 1a of the serrated metal gasket 1 to the top T of the convex portion 3. The depth D is 0.3mm to 0.8mm, preferably 0.4mm to 0.75mm, from the viewpoint of improving the sealing property by the serrated metal gasket 1. The depth (not shown) of the convex portion formed on the lower surface of the serrated metal washer 1 shown in fig. 2 is preferably the same as the depth D.
In fig. 3, an arc is formed in the diametrical direction of the serrated metal washer 1 at the bottommost portion B of the concave portion 4 constituting the serrated uneven portion 1a of the serrated metal washer 1. Therefore, the recess 4 has a cross-sectional shape similar to an inverted trapezoid having a circular arc at the bottommost portion B. The radius of the circular arc is 0.2mm to 0.6mm, preferably 0.3mm to 0.5mm, from the viewpoint of improving the sealing property by the serrated metal gasket 1. The shape of the bottommost portion (not shown) of the concave portion constituting the serrated uneven portion 1B of the serrated metal washer 1 shown in fig. 2 is preferably the same as the shape of the bottommost portion B of the concave portion 4.
In FIG. 3, from the viewpoint of improving the sealing property by the serrated metal gasket 1, the groove area in the cross section of the concave portion 4 constituting the serrated uneven portion 1a is preferably 0.25mm2～0.80mm2More preferably 0.28mm2～0.72mm2. In fig. 3, the groove area is a cross-sectional area of a space portion surrounded by the recess 4 and a straight line connecting a flat portion L formed at the top T of the projection 3 and a flat portion L formed at the top T of another projection 3 adjacent to the projection 3. The groove area in the cross section of the concave portion 4 constituting the serrated uneven portions 1a, 1b is a value obtained as follows: the volume of the test piece is determined based on the mass and density of the test piece, and the volume of the test piece is divided by the thickness of the test piece. The groove area in the cross section of the concave portion (not shown) constituting the serrated uneven portion 1b of the serrated metal washer 1 shown in fig. 2 is preferably the same as the groove area in the cross section of the concave portion 4.
In fig. 3, the angle θ formed by the inclined surfaces adjacent to the concave portions 4 constituting the serrated uneven portion 1a is not particularly limited, but is preferably 60 ° to 120 °, more preferably 80 ° to 100 °, and even more preferably 85 ° to 95 ° in order to improve the sealing property by the serrated metal gasket 1. The angle (not shown) formed by the inclined surfaces adjacent to the concave portions constituting the serrated uneven portion 1b of the serrated metal washer 1 shown in fig. 2 is preferably the same as the angle θ.
In fig. 3, in order to improve the sealing performance of the zigzag metal gasket 1, the convex portions 3 formed on the zigzag uneven portions 1a protrude from the flat plate-shaped flange portion 2 by a height H. In order to improve the sealing performance of the zigzag metal gasket 1, the height H of the convex portion 3 from the flat plate-like flange portion 2 is preferably 0.3mm to 0.8mm, and more preferably 0.4mm to 0.75 mm. The height (not shown) of the zigzag projecting portion from the flat plate-like flange portion 2 of the zigzag metal gasket 1 shown in fig. 2 is preferably the same as the above-described height H.
In fig. 3, the number of the convex portions 3 formed on the serrated uneven portion 1a is different depending on the application of the serrated metal gasket 1, and therefore cannot be determined in a lump, and is preferably at least 3, more preferably at least 5, from the viewpoint of improving the sealing property by the serrated metal gasket 1. The upper limit of the number of the convex portions 3 is not generally determined depending on the application of the serrated metal washer 1, and is usually about 10. The number of the convex portions formed on the serrated concave-convex portion 1b of the serrated metal washer 1 shown in fig. 2 is preferably the same as the number of the convex portions 3.
The serrated concave and convex portions 1a and 1b of the serrated metal washer 1 shown in fig. 2 can be formed by cutting the metal washer by a lathe or the like, for example.
The serrated metal gasket 1 obtained as described above can be suitably used for a metal serrated gasket because it can improve sealing properties with a flange and the like when used for the metal serrated gasket.
The metal tooth pad of the present invention will be described in detail below with reference to the drawings, but the present invention is not limited to the embodiments shown in the drawings.
FIG. 4 is a schematic top view illustrating one embodiment of a metal tooth pad of the present invention. FIG. 5 is a schematic cross-sectional view of portion B-B of the metal tooth pad shown in FIG. 4.
As shown in fig. 4, the metal tooth pad 5 of the present invention is characterized by having a serrated metal washer 1, and elastic pieces 6 are attached to serrated concave-convex portions (not shown) formed on both surfaces of the serrated metal washer 1.
Since the metal tooth pad 5 has the above-described configuration, for example, when the metal tooth pad 5 is clamped and fastened between 2 flanges, a part of the elastic piece 6 enters the concave portion 4 constituting the jagged concave- convex portions 1a and 1b formed on both surfaces of the jagged metal gasket 1 shown in fig. 2 and 3, and the surface pressure of the elastic piece 6 existing in the flat portion L formed on the top T of the convex portion 3 increases, thereby improving the sealing property.
The elastic sheet 6 is preferably an elastic sheet 6 containing an organic binder and an inorganic powder, in order to improve the sealing property and mechanical strength of the elastic sheet 6.
The organic adhesive is preferably a rubber adhesive in order to improve the sealing property and mechanical strength of the elastic sheet 6. Examples of the rubber binder include nitrile rubber, natural rubber, isoprene rubber, chloroprene rubber, acrylonitrile rubber, styrene-butadiene rubber, butyl rubber, fluorine rubber, silicone rubber, and ethylene-propylene rubber, but the present invention is not limited to the above examples. These rubber binders may be used alone or in combination of two or more.
The content of the organic binder in the elastic sheet 6 is preferably 5% by mass or more, more preferably 10% by mass or more, further preferably 15% by mass or more, and further preferably 20% by mass or more in terms of improving the sealability by the elastic sheet 6, and is preferably 97% by mass or less, more preferably 95% by mass or less, and further preferably 90% by mass or less in terms of improving the heat resistance of the elastic sheet 6. Therefore, the content of the organic binder in the elastic sheet 6 is preferably 5 to 97% by mass, more preferably 10 to 95% by mass, even more preferably 15 to 90% by mass, and even more preferably 20 to 90% by mass.
The inorganic powder has properties of improving the flexibility of the elastic sheet 6 and the shape retention of the elastic sheet 6 at high temperatures. Since the inorganic powder is less likely to disappear and remain even when the elastic sheet 6 is heated to a high temperature, the sealing property of the metal tooth gasket 5 of the present invention can be improved.
Examples of the inorganic powder include talc, barium sulfate powder, clay, mica powder, titanium oxide powder, alumina powder, zinc oxide powder, magnesium oxide powder, silicic acid powder, silica powder, calcium carbonate powder, sodium carbonate powder, calcium hydroxide powder, aluminum hydroxide powder, magnesium carbonate powder, graphite powder, metal powder, glass powder, and the like, but the present invention is not limited to the above examples. These inorganic powders may be used alone or in combination of two or more.
The average particle diameter of the inorganic powder is preferably 2 μm or more in order to improve the shape retention of the elastic sheet 6, and is preferably 25 μm or less in order to improve the sealing property. The particle diameter of the inorganic powder is a value measured by a laser diffraction particle size distribution measuring apparatus, and the average particle diameter of the inorganic powder is a value (median diameter) of a particle diameter at which the cumulative number of particles of the inorganic powder in a particle size distribution measured by the laser diffraction particle size distribution measuring apparatus is 50%.
The content of the inorganic powder in the elastic sheet 6 is preferably 3 mass% or more, more preferably 5 mass% or more, and even more preferably 10 mass% or more from the viewpoint of improving the heat resistance of the elastic sheet 6, and is preferably 95 mass% or less, more preferably 90 mass% or less, even more preferably 85 mass% or less, and even more preferably 80 mass% or less from the viewpoint of improving the sealing property by the elastic sheet 6. Therefore, the content of the inorganic powder in the elastic sheet 6 is preferably 3 to 95% by mass, more preferably 5 to 90% by mass, even more preferably 10 to 85% by mass, and even more preferably 10 to 50% by mass.
The elastic sheet 6 may contain fibers in order to improve the mechanical strength and flexibility of the elastic sheet 6. Examples of the fibers include inorganic fibers and organic fibers.
Examples of the inorganic fibers include alumina fibers, glass fibers, zirconia fibers, asbestos, basalt fibers, biosoluble fibers, silica fibers, and ceramic fibers, but the present invention is not limited to the above examples. These inorganic fibers may be used alone or in combination of two or more.
Examples of the organic fibers include synthetic fibers such as polyamide fibers, aramid fibers, polyester fibers, polyurethane fibers, polyethylene fibers, acrylic fibers, and polyvinyl alcohol fibers; plant fibers such as cotton, hemp, and cellulose fibers; animal fibers such as wool; carbon fibers; regenerated fibers such as rayon, etc., but the present invention is not limited to the above examples. These organic fibers may be used alone or in combination of two or more.
The average fiber diameter of the fibers is preferably 3 to 20 μm in order to improve the mechanical strength of the elastic sheet 6. The fiber length of the fibers is preferably 0.01mm or more, and more preferably 0.1mm to 20mm, from the viewpoint of improving dispersibility in the elastic sheet 6 and improving mechanical strength of the elastic sheet 6. The average fiber diameter of the fibers is a value obtained by measuring the fiber diameter of the fibers included in an image taken by a scanning electron microscope and obtaining the average fiber diameter of the fibers.
The content of the fibers in the elastic sheet 6 is preferably 3 mass% or more, more preferably 5 mass% or more from the viewpoint of improving the mechanical strength of the elastic sheet 6, and is preferably 30 mass% or less, more preferably 20 mass% or less, and even more preferably 10 mass% or less from the viewpoint of improving the sealability by the elastic sheet 6. Therefore, the content of the fibers in the elastic sheet 6 is preferably 30% by mass or less, more preferably 3% by mass to 30% by mass, even more preferably 5% by mass to 20% by mass, and even more preferably 5% by mass to 10% by mass.
The method for producing the elastic sheet 6 is not particularly limited. The elastic sheet 6 can be manufactured, for example, as follows: the elastic sheet 6 can be produced by mixing components such as an organic binder, inorganic powder, if necessary, fiber, and an organic solvent to a uniform composition, and molding the resulting mixture into a predetermined shape.
From improving sealing and machineryFrom the viewpoint of strength, the density of the elastic sheet 6 is preferably 0.8g/cm3～1.2g/cm3More preferably 0.9g/cm3～1.1g/cm3。
The thickness of the elastic piece 6 is also determined by the fastening pressure when the metal tooth pad 5 is clamped and fastened between 2 flanges, and is preferably 0.6mm to 1.5mm, more preferably 0.8mm to 1.2mm, from the viewpoint of preventing the elastic piece 6 from breaking at the flat portion L formed at the top T of the convex portion 3 and improving the sealing property.
The elastic sheet 6 is usually attached to both surfaces of the serrated metal gasket 1 so as to cover the serrated concave- convex portions 1a, 1b formed on both surfaces of the serrated metal gasket 1. The elastic sheet 6 may be attached using an adhesive, a double-sided tape, or the like. Examples of the adhesive include rubber-based adhesives, but the present invention is not limited to the above examples.
Even when the metal toothed pad 5 of the present invention configured as described above is held between 2 flanges and adjusted to a high pressure of 80MPa or more in the surface pressure at the time of fastening the metal toothed pad 5, the elastic piece 6 can be present in a thin layer state in the flat portion L formed at the top T of the convex portion 3 formed on both surfaces of the serrated metal washer 1 used for the metal toothed pad 5. For example, in the case of using the elastic sheet 6 having a thickness of about 0.6mm to 1.5mm, when the metal tooth mat 5 is sandwiched between 2 flanges and the metal tooth mat 5 is fastened such that the surface pressure at the time of fastening the metal tooth mat 5 is 80MPa or more, the thin layer having a thickness of about 0.05mm to 0.1mm of the elastic sheet 6 existing in the flat portion L formed at the top portion T of the convex portion 3 becomes extremely small, and the amount of fluid penetrating through the thin layer of the elastic sheet 6 becomes extremely small, so that the sealing property can be improved.
In addition, in order to impart heat resistance to a heat-resistant elastic sheet generally used for a metal tooth pad, for example, an inorganic filler such as talc is contained in a large amount. When the content of the inorganic filler in the heat-resistant elastic sheet is high, the amount of fluid that permeates through the heat-resistant elastic sheet is increased as compared with an elastic sheet that does not contain the inorganic filler, and therefore, it is necessary to increase the surface pressure at the time of fastening the gasket.
On the other hand, when the metal toothed pad 5 of the present invention is held between 2 flanges and the surface pressure at the time of fastening the metal toothed pad 5 is adjusted to a high pressure of 80MPa or more, the elastic piece 6 remains in a thin layer state on the flat portion L formed on the top T of the convex portion 3 formed on both surfaces of the serrated metal washer 1 used for the metal toothed pad 5, and therefore the serrated metal washer is less likely to be exposed by the elastic piece 6, and therefore, the damage of the flange due to the exposure of the serrated metal washer 1 can be prevented.
Therefore, even when the metal tooth gasket 5 of the present invention is attached between flanges of a pipe and fastened so that the surface pressure of the surface of the metal tooth gasket 5 in contact with the flange at the time of fastening the flange is 80MPa or more, the sealing property between the convex portion 3 of the zigzag gasket 1 and the flange can be sufficiently ensured, and therefore the metal tooth gasket 5 of the present invention is excellent in durability under the surface pressure. Accordingly, the metal tooth mat 5 of the present invention is suitable for applications using a fluid having a high temperature and a high pressure, and therefore can be suitably used as a metal tooth mat for a high temperature/high pressure used in, for example, a pipe flange, a tower, a tank, a heat exchanger, an autoclave, a valve cover, a metal seal mechanism, and the like using a fluid such as water vapor having a high temperature and a high pressure.
As can be seen from the above, the metal tooth pad 5 using the serrated metal gasket 1 of the present invention can be suitably used when pipes using a fluid having a high temperature and a high pressure are connected to each other, for example, in a steam plant, a nuclear power plant, a steam turbine ship, a refinery line, a petrochemical industry production line, a semiconductor manufacturing line, and the like.
Examples
The present invention will be described in detail based on examples, but the present invention is not limited to these examples.
Examples 1 to 14 and comparative examples 1 to 6
A serrated metal washer 1 having the shape shown in FIGS. 1 to 3 (outer diameter: 90mm, inner diameter: 75mm of concentric serrated uneven portions, thickness of flange portion: 2mm, angle formed by adjacent inclined surfaces of concave portions: 90 °) was produced by cutting a stainless steel (SUS316) metal washer (outer diameter: 110mm, inner diameter: 75mm of central opening portion) with a lathe. Details of the concave and convex portions formed in the serrated metal gasket 1 are shown in table 1.
The annular elastic sheet 6 was bonded with an adhesive (styrene-butadiene rubber adhesive) to form an annular elastic sheet (outer diameter: 90mm, inner diameter of opening in center part: 75mm, thickness: 0.9mm, material quality: organic binder (nitrile rubber), inorganic powder (talc) and fibers (alumina fibers and cellulose fibers), density: 1g/cm3]The metal toothed pad 5 was produced by adhering the metal toothed pad to the surface of the concentric saw-toothed uneven portion formed on both surfaces of the obtained saw-toothed metal gasket 1. In example 13, the thickness of the elastic sheet 6 was changed to 0.8mm, and in example 14, the thickness of the elastic sheet 6 was changed to 1.2 mm.
Next, as an index of sealing property and durability when high surface pressure fastening is performed using the metal tooth pad 5 obtained above, adhesion of the elastic sheet 6 formed in the convex portion of the concave-convex portion of the zigzag shape and thickness of the elastic sheet 6 were examined and evaluated by the following method. The results are shown in Table 1.
[ sealability at the time of high surface pressure fastening ]
The metal tooth pad 5 is clamped between flanges of a pipe, and the flanges are fastened by adjusting the fastening surface pressure to 100 MPa.
Next, nitrogen gas at 25 ℃ was introduced into the pipe, the internal pressure of the pipe was adjusted to 4MPa, the leakage amount of nitrogen gas was measured by the water-free test method, and the sealing property at the time of high surface pressure fastening was evaluated based on the following evaluation criteria. The results are shown in the column "sealability" in table 1. The measurement limit for measuring the amount of nitrogen leakage was 1.7 × 10-5Pa·m3/s。
(evaluation criteria)
S: the leakage amount of nitrogen gas is 1.7X 10-5Pa·m3(ii) less than s (pass).
Very good: the leakage amount of nitrogen exceeds 1.7 multiplied by 10-5Pa·m3A ratio of 1.7X 10-4Pa·m3(ii) less than s (pass).
O: the leakage amount of nitrogen exceeds 1.7 multiplied by 10-4Pa·m3A ratio of 1.7X 10-3Pa·m3(ii) less than s (pass).
And (delta): the leakage amount of nitrogen exceeds 1.7 multiplied by 10-3Pa·m3A ratio of 1.7X 10-2Pa·m3(fail) less than s.
X: the leakage amount of nitrogen exceeds 1.7 multiplied by 10-2Pa·m3S (fail).
[ adhesion of elastic sheet to convex part ]
After the sealing performance at the time of high surface pressure fastening was evaluated as described above, the flange was detached from the metal tooth pad 5.
The elastic piece adhering to the metal tooth pad was visually observed, and the adhesion of the elastic piece to the convex portion was evaluated based on the following evaluation criteria. The results are shown in the column "adhesion of elastic sheet" in table 1.
(evaluation criteria)
O: no abnormal shape was observed in the elastic sheet.
X: tearing was confirmed in the elastic sheet.
[ thickness of elastic sheet in convex part ]
The thickness of the elastic piece to which the convex portion adheres, which is obtained in the case where the elastic piece adheres to the convex portion, is measured by a micrometer, and the thickness of the elastic piece in the convex portion is evaluated based on the following evaluation criteria. The results are shown in the column "thickness of elastic sheet" in table 1.
(evaluation criteria)
Very good: the thickness of the elastic sheet attached to the convex portion is 150 μm or less (acceptable).
O: the thickness of the elastic sheet adhering to the convex portion exceeds 150 μm and is 200 μm or less (acceptable).
X: the thickness of the elastic sheet attached to the convex portion exceeds 200 μm (failure).
As is clear from the results shown in table 1, the serrated metal gasket 1 and the metal serrated gasket obtained in each comparative example are inferior in at least one of durability and sealing property, while the serrated metal gasket 1 and the metal serrated gasket 5 obtained in each example are superior in sealing property, and not only are the elastic sheets not different even at a surface pressure of 100MPa, but also are superior in durability.
Description of the symbols
1 sawtooth shape metal washer
1a uneven part
1b uneven part
2 flange part
3 convex part
4 concave part
5 metal tooth-shaped pad
6 elastic sheet
Bottommost part of B concave part
Depth of D recess
Flat part of the top of the L-shaped convex part
The top of the T-convex.
Claims (3)
1. A serrated metal washer, wherein concentric serrated concave and convex portions are formed on both surfaces, the pitch of the convex portions constituting the serrated concave and convex portions is 1.2mm to 1.8mm, a flat portion having a width of 50 μm to 180 μm is formed on the top of the convex portions, the depth of the concave portions constituting the serrated concave and convex portions is 0.3mm to 0.8mm, and an arc having a radius of 0.2mm to 0.6mm is formed on the bottom of the concave portions.
2. A serrated metal washer as claimed in claim 1, wherein the groove area in the cross-section of the concave portion constituting the concavo-convex portion of the serration is 0.25mm2～0.80mm2。
3. A metal tooth-shaped gasket comprising the zigzag metal gasket according to claim 1 or 2, wherein an elastic piece having a thickness of 0.6mm to 1.5mm is attached to the zigzag uneven portions formed on both surfaces of the zigzag metal gasket.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2019-057996 | 2019-03-26 | ||
| JP2019057996 | 2019-03-26 | ||
| PCT/JP2020/007139 WO2020195434A1 (en) | 2019-03-26 | 2020-02-21 | Serrated metal gasket |
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| CN113508253A true CN113508253A (en) | 2021-10-15 |
| CN113508253B CN113508253B (en) | 2025-02-25 |
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| JP (1) | JP7328325B2 (en) |
| KR (1) | KR102721283B1 (en) |
| CN (1) | CN113508253B (en) |
| SG (1) | SG11202110457VA (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB201814134D0 (en) | 2018-08-30 | 2018-10-17 | Flexitallic Invest Inc | A gasket |
| GB202003996D0 (en) * | 2020-03-19 | 2020-05-06 | Flexitallic Invest Inc | A gasket |
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- 2020-02-21 JP JP2021508822A patent/JP7328325B2/en active Active
- 2020-02-21 CN CN202080017315.0A patent/CN113508253B/en active Active
- 2020-02-21 KR KR1020217026795A patent/KR102721283B1/en active Active
- 2020-02-21 SG SG11202110457VA patent/SG11202110457VA/en unknown
- 2020-02-26 TW TW109106216A patent/TWI814993B/en active
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20210141459A (en) | 2021-11-23 |
| JP7328325B2 (en) | 2023-08-16 |
| CN113508253B (en) | 2025-02-25 |
| KR102721283B1 (en) | 2024-10-23 |
| TW202045841A (en) | 2020-12-16 |
| JPWO2020195434A1 (en) | 2020-10-01 |
| WO2020195434A1 (en) | 2020-10-01 |
| SG11202110457VA (en) | 2021-10-28 |
| TWI814993B (en) | 2023-09-11 |
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