KR20090064540A - Gasket - Google Patents

Abstract

A gasket that, when it is tightened from both sides by flanges etc., elastically deforms to produce reaction force acting against the tightening force, achieving improved sealing ability, and that is manufacturable at low cost by press working. One or more first annular curved ridges (12, 13) are formed on one side of a plate body (27) having a round hole (11) at its center and formed of an elastic material, and annular curved grooves (14, 15) are formed on the other side, at portions corresponding to the first annular curved ridges (12, 13). One or more second annular curved ridges (16) are formed on the other side, at positions not superposed on the first annular curved ridges (12, 13), and annular curved grooves (17) are formed on the one side, at positions corresponding to the second annular curved ridges (16). Elastically deformable annular connection sections (18, 19) are formed between the first annular curved ridges (12, 13) and the second annular curved ridges (16).

Description

Gasket {GASKET}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket having a sealing function which is used at a connection portion between a pipe and a pipe and prevents leakage of gas or liquid flowing through the pipe to the outside, or intrusion of gas or liquid from the outside into the pipe.

As shown in FIG. 1, a flange 103 and a flange 104 are provided at ends of the pipe 101 and the pipe 102, and the flange 103 and the flange 104 are connected to each other. The pipe 101 and the pipe 102 are connected by fastening and attaching the flange 103 and the flange 104 with the bolt 106 and the nut 107 with the gasket 105 interposed therebetween. Both sides of the gasket 105, the flange 103 and the flange 104 are in close contact with each other, and exhibit a sealing effect, and gas or fluid in the pipes 101 and 102 leaks to the outside, or an external gas or fluid is leaked to the pipe ( Intrusion into the 101 and 102 is prevented.

Conventionally, in this kind of gasket, since the gas or liquid passing through the pipe is high temperature, high pressure, strong alkali, or strong acidity, a suitable material for this is a mixture of asbestos and rubber and carbon, which is mainly molded It was used a lot. However, since the use of asbestos is banned in 2008, a gasket using a material instead of this has been developed. One example is the gasket disclosed in Patent Document 1. FIG. 2 is a diagram showing the configuration of this gasket, FIG. 2A is an overall perspective view, and FIG. 2B is a sectional view.

As shown in FIG. 2, the gasket 200 has a circular hole 201 in the center and a ring on the outer circumferential wall surface 204 of the annular plate body 203 having a joining surface 202 on both sides. The groove 205 is formed to form intimate contact piece portions 206 and 206, and the convex portion 207 is concentric with the inner circumference of the hole 201 in the joining surface 202 of the intimate contact piece portions 206 and 206. ) Is formed. By forming the annular plate body 203 of the gasket 200 by an elastic metal material, as shown in FIG. 1, when the gasket 200 is interposed between the flange and the flange and fastened with a bolt and a nut, the convex part ( 207 is pressed against the surface of a flange by the elastic force which the contact piece part 206 has, and the said convex part 207 and a flange surface are in close contact, and exhibit a sealing effect.

The gasket is excellent in sealing property, and is made of an elastic metal material, and its surface is subjected to corrosion treatment, so that it can be expected to exert excellent sealing action against gases, liquids of high temperature, high pressure, strong alkali, and strong acid, but the annular plate body Since the annular groove 205 needs to be formed on the outer circumferential wall surface 204 of 203 by cutting, there is a problem that there are many processing steps and the cost is high. Moreover, since the one ring-shaped convex part 207 formed in the surface of the outer peripheral part vicinity of the close contact piece parts 206 and 206 of the annular plate body 203 exhibits a sealing effect, it shows, for example in FIG. As described above, when the corrosive gas or liquid flows into the pipes 101 and 102, the corrosive gas or liquid causes the surfaces of the flanges 103 and 104 and the respective joining surfaces 202 and the convex portions of the annular plate body 203. It enters into the space formed by the rough parts 207 and 207, and this space becomes a collection point of corrosive gas liquid. In addition, there is also a problem in that sufficient sealing effect cannot be obtained because the sealing is performed by one convex portion 207 formed on the joining surface 202.

Moreover, there exist some described in patent document 2 as a conventional gasket. The gasket is formed by forming the bent part 211 from the main bent part 212 and the auxiliary bent parts 213 and 214 on the metal plate. As shown in FIG. 3, the gasket 210 is interposed between the flange 103 and the flange 104, and the flange 103 and the flange 104 are fastened with bolts and nuts (not shown). Thereby, the piping 101 and the piping 102 can also be connected in the state which maintained the sealing property.

As shown in FIG. 4 when the gasket 210 having the bent part 211 formed from the main bent part 212 and the sub bend parts 213 and 214 on the metal plate is used for the connection between the pipe 101 and the pipe 102 as described above. As described above, the gasket 210 is fastened by the strong force F by the flange 103 and the flange 104 from both sides. Since the gasket 210 is a metal plate and is formed in an annular shape, and the main bends 212 and the sub bends 213 and 214 are formed in a continuous curved surface, elastic deformation in the radial direction is restricted (main bend 212). And the secondary bends 213 and 214 are not enlarged in the radial direction. Therefore, when the components f and f of the force F are applied to the point A portions of the gasket 210 from opposite directions, and the components f and f are large, the gasket 210 buckles at the point A portions. The top portions of the main bends 212 and the sub bends 213 and 214 are concave or deformed (plastic deformation). When the plastic deformation portion other than such elastic deformation is generated in the gasket 210, there is a problem that the sealing property of the gasket 210 is lowered. In addition, since a large elastic deformation cannot be expected in the gasket 210, in order to maintain sealing property, it is necessary to finish the contact surface of the gasket 210, the flange 103, and the flange 104 in a mirror shape. However, there is a problem that this mirror processing is expensive.

Patent Document 1: Japanese Patent Application Laid-open No. Hei 11-22826

Patent Document 2: Japanese Patent Application Laid-open No. Hei 11-230355

According to the first invention of the present application, since at least a part of the annular connecting portion is formed between the first annular bending protrusion and the second annular bending protrusion, which is flat and elastically deformed, the first annular bending protrusion and the second annular bending protrusion When the clamping adhesive force is applied, the annular connecting portion elastically deforms, and the sealing resistance is improved because the elastic reaction force gives the first annular bending protrusion and the second annular bending protrusion to press the seal surface. Moreover, since employing such a structure can manufacture a gasket by one process of press work, manufacturing cost becomes low.

According to the second invention of the present application, since the shape of the hole in the center is circular or rectangular or polygonal, it can be used for pipe connection of circular or rectangular or polygonal.

According to the third invention of the present application, the plate body is made of a metal material having elasticity, and a corrosion resistant coating layer is formed on the surface thereof, whereby a gasket suitable for use in connecting pipes handling corrosive gas or liquid can be obtained.

According to the fourth invention of the present application, since the corrosion resistant coating layer is made of a material having flexibility, the sealing property is further improved.

According to the fifth invention of the present application, since the plate body is made of a non-metallic material having elasticity and corrosion resistance, a gasket suitable for use in connecting pipes for handling corrosive gas or liquid can be obtained.

The present invention has been made in view of the above points, and even if the gasket is fastened from both sides to a flange or the like, a reaction force can be generated due to the elastic deformation and the sealing force can be improved, and the sealability can be improved using press working or the like. It is an object to provide a gasket which can be manufactured at cost.

The 1st invention of this application which solves the said subject has one or several 1st annular bending protrusion parts in the plate body which has a hole part in the center, and consists of an elastic material in the outer peripheral side of the said hole part of the one side, One in the position which forms an annular bending recessed part in the part corresponding to the said 1st annular bending protrusion part of the surface of, and does not overlap with the said 1st annular bending protrusion part in the outer peripheral side of the said hole part of the other surface. Alternatively, the plurality of second annular curved protrusions are formed in a portion corresponding to the second annular curved protrusions on the one surface, and the first annular curved protrusions and the second annular shape are formed. The gasket is characterized in that an annular connection portion is formed which is at least partially flat and elastically deformed between the bent protrusions.

The second invention of the present application is the gasket of the first invention of the present application, wherein the shape of the central hole is circular, rectangular, or polygonal.

The third invention of the present application is the gasket of the first invention of the present application, wherein the plate is made of a metal material having elasticity, and a corrosion-resistant coating layer is formed on the surface thereof.

The fourth invention of the present application is the gasket of the third invention of the present application, wherein the corrosion-resistant coating layer is made of a material having flexibility.

The fifth invention of the present application is the gasket of the first invention of the present application, wherein the plate member is made of a nonmetallic material having elasticity and corrosion resistance.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structural example of the piping connection using the conventional gasket.

Fig. 2 is a view showing a structural example of a conventional gasket, Fig. 2A is an external perspective view and Fig. 2B is a sectional view.

It is a figure which shows the structural example of the piping connection using a conventional gasket.

4 is a view for explaining the fastening operation of the conventional gasket.

It is a figure which shows the structural example of the gasket which concerns on this invention, FIG. 5 (a) is a top view, and FIG. 5 (b) is an A-A sectional view.

It is a figure which shows the structural example of the piping connection using the gasket which concerns on this invention.

It is a figure for demonstrating the fastening attachment operation of the gasket which concerns on this invention.

It is a figure for demonstrating the structural example and fastening attachment operation | movement of a gasket which concerns on this invention.

It is a figure for demonstrating the structural example and fastening attachment operation of the gasket which concerns on this invention.

[Description of the code]

10: gasket

11: circle hole

12, 13: 1st annular bending protrusion

14, 15, 17: annular bending recess

16: second annular bending protrusion

18, 19: annular connection portion

20: hole

21, 22: Piping

23, 24: flange

25: Bolt

26: Nut

27: plate

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail based on drawing. It is a figure which shows the structural example of the gasket which concerns on one Embodiment of this invention, FIG. 5 (a) is a top view, and FIG. 5 (b) is an A-A arrow cross section. As shown in the drawing, the gasket 10 is formed on the outer circumferential side of the circular hole 11 on one surface (surface) of the plate body 27 made of an elastic material having a circular hole 11 formed at the center thereof. 11) and the first annular curved projections 12 and 13 having a plurality of circular shapes (two in the drawing) having a circular arc shape, and the first annular curved projections 12 and 13 on the other surface (rear surface). The circular curved concave portions 14 and 15 of the cross-sectional arc shape are formed in a portion corresponding to the shape of the circular hole 11 on the outer circumferential side of the circular hole 11 on the other side (rear surface). In addition, the second annular curved projection 16 having one arc-shaped cross section at a position not overlapping with the first annular projections 12 and 13 is connected to the second annular curved projection 16 on one surface (surface). A circular curved concave portion 17 having a circular arc shape in the corresponding portion is formed, and the first annular curved protrusions 12 and 13 and the second annular curved protrusion 16 are formed. It is the structure which formed the annular connection part 18 and 19 of the shape of the circular hole 11, and the similar form between the flat hole 11 in between. Reference numeral 20 denotes a hole through which the bolt penetrates.

As shown in FIG. 6, the gasket 10 of the said structure is a circle | round | yen of the plate body 27 between the flange 23 and the flange 24 which were provided in the pipe 21 and the edge part of the pipe 22, respectively. The center of the hole is interposed so as to coincide with the center of the pipe 21 and the pipe 22, and the flange 23 and the flange 24 are fastened and attached with the bolt 25 and the nut 26, which will be described later in detail. As described above, the annular connecting portions 18 and 19 of the gasket 10 are elastically deformed by the fastening attachment force, and the first annular bent protrusions 12 and 13 of the gasket 10 are flanged by the restoring force by elasticity. On the surface of 24, the second annular bending protrusion 16 contacts the surface of the flange 23 with a strong pressing force, and the first annular bending protrusions 12 and 13 and the second annular bending protrusion 16 The top of the gasket 10 and the gasket 10 and the flanges 24 and 23 are sealed and sealed.

7 (a) to 7 (c) are enlarged views showing a deformation state of the gasket when the gasket 10 is sandwiched between the flange 23 and the flange 24 to strengthen the clamping force. to be. As shown in the figure, the first annular bent projections 12 and 13 formed on one surface (surface) of the plate body 27 of the gasket 10 and the second annular bend formed on the other surface (rear surface). Since the projections 16 are formed by shifting their positions so as not to overlap with each other, when the gasket 10 is strongly fitted to the flange 23 and the flange 24, the mainly flat annular connecting portions 18 and 19 of the gasket 10 are formed. ) Is deformed in the up and down direction, as shown in Figs. 7B and 7C. With the restoring force F by the elastic deformation of the annular connecting portions 18, 19, the first annular flexures 12, 13 and the second annular flexures 16 are respectively face 24a of the flange 24. ) And the surface 23a of the flange 23 are pressed. As a result, the top portion of the first annular curved protrusions 12 and 13 and the flange 24a and the top portion of the second annular curved protrusion 16 and the surface 23a of the flange 23 are sealed and sealed. .

In addition, in the said example, although the 2nd annular bending protrusion part 16 was made into 1, the 2nd annular bending protrusion part 16 is also formed so that it may not overlap with the 1st annular bending protrusion parts 12 and 13, and the said You may also connect between the 2nd annular bending protrusion part and the 1st annular bending protrusion part 12 or 13 by the flat annular connection part. Moreover, two or more 1st annular bending protrusion part and 2nd annular bending protrusion part may be sufficient, and even in that case, the 1st annular bending protrusion part and the 2nd annular bending protrusion part are connected by the flat annular connection part.

Since the restoring force F of the gasket 10 is determined by the elastic force of the plate body 27, in order to obtain a strong sealing force, the plate body 27 is made of an elastic metal material, for example, steel or the like. In addition, this gasket 10 has one or a plurality of first annular bending protrusions 12 on the outer circumferential side of the circular hole 11 on the surface of the plate body 27 in which the circular hole 11 is formed in the center as described above. , 13), one or a plurality of second annular bent projections 16 are formed on the outer circumferential side of the circular hole 11 on the back surface, and the first annular bent projections 12, 13 and the second are formed. Since it is the structure which forms the annular connection part 18 and 19 between the annular bending protrusion part 16, it can manufacture easily by press working. Therefore, a gasket exhibiting an excellent sealing effect can be produced in large quantities at low cost.

In the case where the plate body 27 of the gasket 10 is made of steel, in order to use it in a corrosive environment such as strong alkali and strong acidity, the gasket 10 is subjected to a corrosion treatment, for example, a Teflon (registered trademark) coating on the surface and an anticorrosive rubber. What is necessary is just to form corrosion-resistant coating layers, such as coating, copper plating, and zinc plating. If the coating layer is made of a flexible material such as a Teflon (registered trademark) coating or a corrosion resistant rubber coating, if the flanges 23 and 24 have irregularities such as damage, the coating layer may be formed according to the irregularities of the flange 23 and 24 surfaces. Since it is deformed and intimately, the sealing effect is improved. Moreover, it is also good to use non-stick steel materials, such as SUS. Moreover, plastics, such as elastic and corrosion-resistant nonmetals, for example, polyethylene terephthalate and a polyimide, can also be used.

In addition, in the said example, although the cross-sectional shape of the 1st annular bending protrusion part 12 and 13 and the 2nd annular bending protrusion part 16 was made into circular arc shape, it is not limited to this, For example, shown in FIG. As described above, the first annular bending protrusions 12 and 13 and the second annular bending protrusions 16 may be triangular in cross section. Also in this case, when the gasket 10 is fastened and attached from both sides by the flanges 23 and 24, the annular connecting portions 18 and 19 are elastically deformed as shown in FIG. The first annular bent projections 12 and 13 and the second annular bent projections 16 are pressed against the surface 24a of the flange 24 and the surface 23a of the flange 23. The cross-sectional shape of the 1st annular bending protrusion part 12 and 13 and the 2nd annular bending protrusion part 16 is a cross-sectional shape whose top part contacts a flange surface in linear form or strip | belt shape, and seals between them properly. The back surface may be a rectangular shape or an elliptic shape.

In addition, the annular connecting portions 18 and 19 do not have to be flat, and may be stepped as shown in Fig. 9, for example, but the point is that the first annular bent projections 12 and 13 are formed. The two annular bent projections 16 are not connected to the continuous curved surface, and at least a part of the two annular bent projections 12 and 13 are not flat to the curved surfaces of the second annular curved projections 16. When it is formed and a fastening adhesive force is applied to the gasket 10, it is good to be a structure which elastically deforms and gives reaction force by elastic force to the 1st annular bending protrusion part 12 and 13 and the 2nd annular bending protrusion part 16. As shown in FIG.

In addition, although the said gasket 10 all showed the example which formed the circular hole 11 in the center part of the board body 27, the hole formed in the center part is not limited to a circle | round | yen, but in the cross-sectional shape of the piping to connect Therefore, polygons, such as square, may be sufficient. In addition, although the 1st annular bending protrusion part 12 and 13 and the 2nd annular bending protrusion part 16 were similar to the hole formed in the center part, it is not limited to a similar shape but annular shape surrounding the hole formed in the center part. It should be good.

As described above, the gasket 10 is configured to connect the first annular bending protrusions 12 and 13 and the second annular bending protrusion 16 to the annular connection portions 18 and 19 that are elastically deformed. Since there is no buckling (plastic deformation) like the gasket 210 (refer FIG. 3 and FIG. 4) disclosed by patent document 2, in the fastening adhesion force of the flanges 23 and 24 and the clearance of the flanges 23 and 24, I can afford it. On the other hand, in the gasket 210 disclosed in Patent Document 2, there is a possibility that buckling (plastic deformation) may occur, so it is necessary to strictly manage the fastening adhesion force of the flange and the gap between the flanges. Therefore, in the gasket 10 which concerns on this embodiment, although the bending of the flanges 23 and 24 of the part spaced apart from the fastening bolt 25 and the nut 26 can be taken large, it is disclosed by patent document 2 In the gasket 210, the warpage cannot be increased.

In addition, in the gasket 210 disclosed in Patent Document 2, the gaskets of the flanges 103 and 104 (see FIG. 3) are intended to obtain airtightness only at the tops of the main bends 212 and the sub bends 213 and 214. The tops of the major bends 212 and the sub bends 213 and 214 of 210 and the surfaces of the flanges 103 and 104 in contact with the tops must be subjected to high precision (mirror finish). In contrast, in the gasket 10, the airtightness is shared by the tops of the first annular flexures 12 and 13 and the second annular flexures 16 and the elastic deformation of the annular joints 18 and 19. Therefore, it is not necessary to finish the tops of the first annular bent projections 12 and 13 and the second annular bent projections 16 and the surfaces of the flanges 23 and 24 with high precision.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various deformation | transformation is possible within the scope of a claim, and the technical idea described in specification and drawing. Any shape or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the action and effect of the present invention are exhibited.

As described above, according to the present invention, one or a plurality of first annular bending protrusions are provided on a plate body having a hole in the center and made of an elastic material on the outer peripheral side of the hole. In a position corresponding to the first annular bent projection on the other side, and at a position not overlapping with the first annular protrusion on the outer peripheral side of the hole of the other side. One or a plurality of second annular curved protrusions are formed in a portion corresponding to the second annular curved protrusions on the one surface, and the first annular curved protrusions and the second are formed. Since at least a part of the annular connection portion is formed between the annular bent projections and is flat and elastically deformed, the flange is provided between the flange and the flange provided at the end of the pipe. When both flanges are fastened and attached through the gasket, the annular connecting portion elastically deforms, and the elastic reaction force gives the first annular bending protrusion and the second annular bending protrusion to press the seal surface to press the seal surface. Sealability is improved. Moreover, since employing such a structure can manufacture a gasket by one process of press work, manufacturing cost becomes low.

In addition, since the plate is made of a metal material having elasticity and a corrosion resistant coating layer is formed on the surface thereof, a gasket suitable for use as a gasket used for a connection portion of a pipe for handling high temperature, high pressure, strong alkali, and strongly acidic corrosive gas or liquid is provided. can do.

In addition, since the corrosion-resistant coating layer is made of a material having flexibility, the sealing resistance is improved because the corrosion-resistant coating layer is in close contact with the uneven surface even if there are irregularities such as damage on the flange surface to be contacted, for example.

In addition, since the plate body of the gasket is elastic and is made of a corrosion-resistant nonmetallic material, a gasket suitable for use in connecting a pipe handling corrosive gas or liquid can be obtained.

Claims (5)

On the plate body which has a hole part in the center, and an elastic material, one or several 1st annular bending protrusion part in the outer peripheral side of the said hole part of the one surface, To the said 1st annular bending protrusion part of the other surface One or a plurality of second annular bent projections are formed at positions corresponding to the annular bent concave portions at the corresponding portions and not overlapping with the first annular bent projections on the outer circumferential side of the other surface. An annular flexure is formed in a portion corresponding to the second annular flexure of the one surface, and at least a part is flat and elastic between the first annular flexure and the second annular flexure; A gasket, characterized in that a deformed annular connecting portion is formed. The gasket according to claim 1, wherein a shape of the central hole is circular, square, or polygonal. The gasket according to claim 1, wherein the plate is made of a metal material having elasticity, and a corrosion resistant coating layer is formed on the surface thereof. The gasket according to claim 3, wherein the corrosion resistant coating layer is made of a material having flexibility. The gasket according to claim 1, wherein the plate is made of a nonmetallic material having elasticity and corrosion resistance.

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