JP2002005290A - Gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasket capable of obtaining good seal effect by realizing elastic rebounding power (seal load) opposing compression load and good follower characteristic of distortion by elastic change in a wide range as well as expansion power corresponding to change of compression load. SOLUTION: The gasket of this invention is formed into a continuous cross- sectional form in which a plurality of C shape cross-sectional form parts is mutually connected to ajacent other C shape cross-sectional form parts adjoining each other. This gasket receives the stress in distribution without concentrating the stress to compression load on one point when this gasket is equipped to the component for a seal of an applied part by making the back of each adjoining C shape section form part connect mutually.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a gasket,
Particularly, while exhibiting an elastic repulsive force (seal load) against a compressive load, it is possible to obtain a good sealing property,
The present invention relates to a gasket that elastically fluctuates over a wide range and exerts an expansion / contraction force in accordance with a fluctuation of a compression load to obtain good displacement followability.

[0002]

2. Description of the Related Art Conventionally known gaskets (particularly, static metal seals) include a gasket called an O-ring, a gasket having only a single C cross-sectional shape, and a gasket having a corrugated cross-sectional shape. There are things like gaskets.

Among the conventional gaskets referred to as O-rings described above, metal hollow rings have been developed in order to satisfy particularly strict application conditions in terms of life, temperature, pressure and corrosion required in nuclear power equipment and the like. It is.
In this metal hollow ring, strong rigidity is obtained by the ring-shaped cross section. However, this strong rigidity is a hindrance in exerting an elastic repulsive force (seal load) by narrowing the range in which elastic deformation is possible (elastic region).

A conventional gasket having only a single C-shaped cross section has been developed to further improve the function of a metal hollow ring. This gasket consisting of only a single C cross section reduces elastic repulsion (seal load) as compared with a metal hollow ring,
The displacement followability according to the fluctuation of the compression load is improved.
However, in the gasket having only the single C-shaped cross section, the sealing property and the displacement following property depend on the elastic repulsion (seal load). Therefore, in this gasket, if the elastic repulsive force (seal load) is increased by simply increasing the thickness of the cross-sectional shape, etc., the sealability is improved, but the range in which elastic deformation is possible is narrowed, and the displacement followability is reduced. Resulting in. Conversely, in this gasket, if the elastic repulsion (seal load) is reduced by simply reducing the thickness of the cross-sectional shape, the range in which elastic deformation is possible is expanded and the displacement followability is improved, but the sealability is reduced. Would.

More specifically, in the conventional gasket having only a single C-shaped cross-section, stress is concentrated at one point on the back of the single C-shaped cross-section when the gasket is mounted. Plastic deformation occurs at the spine of one C-shaped section. After this initial deformation, the area of plastic deformation gradually expands due to the load corresponding to the pressure receiving area. When the area of the plastic deformation reaches the seal line, the elastic repulsion (seal load) cannot be exerted, and the sealing property cannot be obtained.

Further, the conventional gasket having the above-described corrugated cross-sectional shape has relatively excellent displacement followability between members to be sealed. However, the gasket having the corrugated cross-sectional shape is not intended to ensure the sealing performance, and is not configured so that adjacent peaks come into contact with each other. Therefore, in a gasket with a corrugated cross section,
It is impossible to exhibit an elastic repulsive force (seal load) that ensures the sealing performance.

[0007] In any of these conventional gaskets, although improvement in sealing performance and displacement followability has been demanded by users, the reality is that gaskets have not yet been developed to satisfy the demand.

The present invention has been made in view of the above problems and has been made to solve the above problems. It is an object of the present invention to exhibit a good sealing property by exerting an elastic repulsive force (seal load) against a compressive load. It is another object of the present invention to provide a gasket that can elastically fluctuate over a wide range and exhibit an expansion / contraction force in accordance with the fluctuation of a compressive load to obtain good displacement followability.

[0009]

Means for Solving the Problems In order to solve the above problems, the gasket of the present invention is formed in a cross-sectional shape having a plurality of C cross-sectional shapes, and each of the C cross-sectional shapes is adjacent to each other. And is connected to another C cross-sectional shape portion. In another gasket of the present invention, in the gasket described above, the gasket is formed in a cross-sectional shape further having a connecting portion interposed between the respective C cross-sectional shape portions, and the connecting portion is connected to each adjacent C cross-sectional shape portion. It was assumed. According to another gasket of the present invention, in the above-described gasket, the connecting portion has an inverted C cross-sectional shape having an opposite shape to the C cross-sectional shape portion. According to another gasket of the present invention, a coating film is provided on the surface of the above-described gasket by performing plating treatment or the like.

[0010]

According to the gasket of the present invention, when the gasket is mounted on the member to be sealed at the application location and compressed,
The backs of the cross-sections abut each other and press in opposing directions.
Each C cross-sectional shape part distributes the stress to the compressive load without concentrating it at one point, and distributes the stress. Therefore, this gasket elastically fluctuates over a wide range while exhibiting an elastic repulsive force (seal load) against a compressive load,
Exhibits expansion and contraction force according to the change in compression load. Further, a connecting portion interposed between the respective C-shaped sections is connected to the adjacent C-shaped sections to connect the respective C-shaped sections. Further, the connecting portion having an inverted C-shaped cross-section, which has an opposite shape to the C-shaped shaped portion, bends when pressurized by a compressive load and bears a part of the compressive load, thereby reducing the compressive load applied to the C-sectional shape. I do. Furthermore, a coating film formed by applying a plating process such as silver plating and / or other soft plating to the surface works so as to fill gaps of the surface roughness level of the member to be sealed at the application location, and the sealing is performed. Demonstrate function.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a partial sectional view showing an embodiment of the gasket of the present invention, FIG. 2 is a partial sectional view showing an uncompressed state when the gasket of FIG. 1 is mounted, and FIG. 3 is a sectional view of the gasket of FIG. It is a partial sectional view showing a compression state at the time of wearing. In the drawings, reference numerals 8 and 9 denote members to be sealed to which the gasket 10 of the present invention is applied.

Gasket 1 of the embodiment shown in FIGS.
0 denotes a first C-shaped section 11, a second C-shaped section 12, and a connecting section 1 connecting the C-shaped sections 11, 12.
3 and is made of an integral metal and formed in a cross-sectional shape. In the gasket 10, a plurality of C-shaped sections are continuous in the compression load direction, and each C-shaped section is connected to another adjacent C-shaped section.

The first C-shaped section 11 is curved from an upper edge 11a to a circular shape and extends to a lower connecting portion 11c so as to form a back 11b on the convex curved surface side. 11 c is connected to one end of the connecting portion 13. Also,
The second C-shaped portion 12 is curved from the upper connecting portion 12a in a circular shape and extends to the lower edge 12c so as to form a back 12b on the convex curved surface side, and the connecting portion 12a is connected. It is connected to the other end of the part 13. In each of the C-shaped portions 11, 12, an edge 11a and a connecting portion 11c are provided.
And between the connecting portion 12a and the edge 12c,
A gap is provided.

The connecting portion 13 is formed by inverting the first C-shaped portion 11 and the second C-shaped portion 12 described above.
It is formed in an inverted C cross-sectional shape having an opposite shape to the cross-sectional shape portion. The connecting portion 13 is a state in which the first C-shaped portion 11 and the second C-shaped portion 12 are arranged such that the spines 11b and 12b formed on the respective convex curved surface sides are arranged on the same side. The extension direction is changed to the opposite direction from the connecting portion 11c of the first C-shaped portion 11 having one end connected thereto, and the second C-shaped portion 12 connected to the other end is curved and formed at the other end. Section 12a has been reached. As described above, the connecting portion 13 connects the first C-shaped section 11 and the second C-shaped section 12 to each other and forms a continuous C-shaped section between the C-shaped sections 11 and 12. Are interposed integrally. Further, the connecting portion 13 secures a slight gap between the first C-shaped section 11 and the second C-shaped section 12 in the non-compressed state. It should be noted that the connecting portion 13 is, as described above, the first C-shaped portion 11.
And the second C-shaped section 12 is formed to have an inverted C-shaped section inverted from the first C-shaped section 11 and the second C-shaped section 12. Some similar forms.

In manufacturing the gasket 10, for example, a drawing process, a bending process, and / or another pressing process are employed, and for example, a process of forming a C-shaped portion and a process of forming a connecting portion are performed. By alternately and repeatedly performing the plastic deformation of a desired metal base material according to the purpose, a plurality of C-shaped cross-sections 11 and 12 are connected to other adjacent C-shaped cross-sections to form a continuous cross-section. Can be formed. For example, as the metal base material used here, for example, a band-shaped metal plate formed by welding such as welding a strip-shaped metal plate, or a ring-shaped substrate formed by cutting a seamless pipe into a ring shape can be used. In the present embodiment, a metal substrate is used, but a substrate of a desired material according to other uses may be used.

When the gasket 10 described above is mounted on the members 8 and 9 to be sealed, which are to be applied, for example, as shown in FIG. 2 and FIG.
First, the gasket 10 is fitted into the concave portion. In this fitted state, the distance between the sealing target members 8 and 9 is reduced so as to sandwich the gasket 10 between the sealing target members 8 and 9, and the gasket 10 is pressed in the compression load direction (vertical direction). In this manner, the gasket 10 is mounted at the application location.

The gasket 10 attached to the application location is
The members to be sealed 8 and 9 are compressed by pressurization. The compressed gasket 10 exerts its own (gasket 10) elastic repulsive force (seal load) against the compressive load due to the pressurization of the sealing target members 8 and 9.

In the initial gasket 10 compressed by the compressive load, the connecting portion 13 is bent and elastically deformed, and the spine 1 near the connecting portion 11c in the first C-shaped portion 11 is formed.
1b and a connecting portion 12a in the second C-shaped section 12
The nearby back 12b contacts. When the connecting portion 13 flexes and elastically deforms in this manner, each of the adjacent C cross-sectional shape portions 11,
The backs 11b, 12b of the twelve 12 come into contact with each other and press against each other. Each sealing target member 8, 9 at the applicable location
When the compression further proceeds, each of the C-section shaped portions 11, 1
2 is bent and elastically deformed, so that the stress against the compressive load is distributed and received without being concentrated at one point. In the gasket 10 of the present embodiment, the two C-shaped cross-sections 11 and 12 are connected and have a continuous cross-section,
Compared to a conventional gasket having only a single C cross-sectional shape, the amount of deflection was doubled, and the spring constant was reduced by half. That is, according to the gasket of the present invention, as compared with a conventional gasket having only a single C cross-sectional shape, the amount of bending is a value corresponding to a multiple of the number corresponding to the number of C cross-sectional shape portions, The spring constant is a spring constant having a value corresponding to a reciprocal that is a multiple of the number corresponding to the number of the C cross-sectional shape portions.

Further, the members 8 and 9 to be sealed at the application locations
Even if the compressive load applied to the gasket 10 fluctuates due to deformation or the like, as described above, the stress due to the compressive load is dispersed and received without concentrating at one point. And the connection part 13 exhibits an elastic repulsion force (seal load), respectively. Accordingly, the gasket 10 does not undergo plastic deformation due to the compressive load, can elastically vary over a wide range, and exerts a stretching force according to the change in the compressive load.

As described above, according to the gasket 10, the resilient repulsion (seal load) against the compressive load is exerted by the C-shaped portions 11, 12 and the connecting portion 13, so that good sealing properties can be obtained. In addition to the above, it is possible to exhibit the expansion and contraction force according to the change in the compression load, and obtain good displacement followability. Therefore, it is most suitable as a gasket to be applied under strict application conditions in terms of life, temperature, pressure, corrosion and the like required for nuclear power equipment and the like. Further, it can be expected to be used in places where the applied parts such as high pressure, high temperature, and light weight are greatly deformed in recent years, for example, rocket engines and aircraft equipment.

The entire surface of the gasket 10 may be covered by a step of forming a coating film by applying a plating process such as silver plating and / or other soft plating to the surface. Good. According to the coating film formed on the entire surface of the gasket 10, the sealing function is exerted by filling the gap at the surface roughness level of the member to be sealed at the application location, and the sealing performance can be further improved. .

The gasket 10 of the present embodiment and the gasket of the prior art are combined under a certain condition, that is, under the condition that the free height is the same and the member to be sealed is the same. When the gasket 10 according to the present embodiment is compared with the elastic repulsive force (seal load) and the elastically deformable range (sealable deformation follow-up range) when the gasket 10 is mounted on the member to be sealed, the elasticity against the compressive load is obtained. The repulsive force (seal load) is greatly increased compared to the prior art gasket, and the range in which elastic deformation is possible (the sealable deformation follow-up range) is significantly increased as compared with the conventional art gasket. Good displacement followability is obtained. In addition, "the range in which elastic deformation is possible" means the amount of springback,
The amount of return that returns when released after compression.The greater the value of this amount of return, the more the expansion and contraction force can be exhibited in accordance with the change in compression load due to deformation of the application location, etc., and good displacement followability is obtained. Can be

In the above-described embodiment shown in FIGS. 1 to 3, two C-shaped sections such as a first C-shaped section 11 and a second C-shaped section 12 are connected to each other to form a continuous section. Although the gasket has a shape, the gasket may have a continuous cross-section in which three or more C-shaped portions are connected to other adjacent C-shaped portions. As described above, if the gasket has a continuous cross-sectional shape in which three or more C-shaped cross-sections are connected to another adjacent C-shaped cross-section, a predetermined elastic repulsion force against a compressive load ( By exerting the sealing load, a better sealing performance can be obtained, and elasticity can be varied over a wide range. Obtainable. In this case, the connecting portion 13 described above is interposed between each of the plurality of C-shaped portions.

FIG. 4 shows a load-displacement curve A of a gasket according to the present invention (hereinafter, referred to as a gasket of the present invention) formed in a cross-sectional shape having two (plural) C cross-sectional shape portions according to the above-described embodiment. And a conventional gasket consisting of only a single C cross-sectional shape (hereinafter referred to as a conventional gasket)
4 is a graph showing load-displacement curves B and B ′ of FIG. The same gasket is used as the gasket of the present application and the conventional gasket with the respective free heights in a non-compressed state as prerequisites for comparison.

When the gasket of the present invention and the conventional gasket were tested for their respective sealable load ranges and sealable deformation following ranges, the load-displacement curves shown in FIG. 4 were obtained as a result. In FIG. 4, the load-displacement curve of the gasket of the present application is shown by a solid line, the load-displacement curve of the conventional gasket is shown by a broken line, and the amount of compression (mm) from the free state is plotted on the horizontal axis. Seal load per 1cm circumference (kgf / CIR
C. cm) is plotted on the vertical axis.

[0026] For this application the gasket compresses the free state x ₀ gradually x _{5 (e.g.} 1mm) was deflated, the load represented by the solid line in FIG. 4 - as displacement curve A, non-sealing load y Perimeter 1cm gradually increased from ₀
Sealing load per y ₅ is exhibited, similar load and when the compressor gradually releasing the compression state of the present gasket -
It was confirmed that the film was expanded following the displacement curve A and returned to the original state. Note that the load-displacement curve A of the gasket of the present application is x
Is What refracted at ₂ to contract is bent connecting portion between the C cross sectional shape portions adjacent in compression from x ₀ to x _2, each C cross sectional shape portion in x ₂ abuts x _{2 x 5} from
This is due to the fact that each of the C cross-sectional shape portions bends and contracts.

That is, the gasket of the present invention is not
Following the weight-displacement curve A, (x₀, Y ₀) To (x₂, Y
₁) And (x₃, Y₂) And (x₅, Y₅Reached)
When the compressed state is released, the load-displacement curve A is traced.
Extends from next time without plastic deformation at the time of compression
Load-displacement curve even when compressed and when released
It will expand and contract following the line A.

Therefore, in the gasket of the present invention,
When y ₂ or more sealing load is determined as a minimum sealing load, range Ay sealable load y
₂ be in the range of y ₅ from sealable deformable follow range A
x is in the range from _{x 3} of _{x 5.}

[0029] In contrast, a conventional gasket, is compressed from the free state x ₀ gradually x _{5 (e.g.} 1mm) was deflated, the load is shown by a broken line in FIG. 4 - as displacement curve B, Non-seal load y ₀ during initial compression
Gradually although increased to seal a load of circumferential length 1cm per y ₄ is exerted from the load during the initial compression when gradually releasing the compression state of the conventional gasket - other load without traversing the displacement curve B - It was confirmed that the material was only stretched following the displacement curve B ', and did not return to the original shape and was plastically deformed.

In other words, the conventional gasket is
Follow the load-displacement curve B (x ₀, Y₀) To (x
₁, Y₃) And (x₅, Y₄) And the compression
When released, it expands following another load-displacement curve B '.
However, plastic deformation has occurred during the first compression, and from the next time
Load-displacement during compression and release of the compressed state
It expands and contracts following the curve B '. In addition, conventional gas
The plastic deformation of the gasket is based on the
Following the load-displacement curve B during contraction, (x₀, Y₀From)
(X₁, Y₃) Although it is elastically deformed up to around,
(X₁, Y₃) Near (x₅, Y₄) Over compression
It is caused by.

Therefore, in the conventional gasket,
When y ₂ or more sealing load is determined as a minimum sealing load, range of sealable load B'y is in the range of y ₂ of y _4, the sealing possible variations follow range B'x in the range of _{x 5} from x _4.

As described above, in the gasket of the present invention, even when compressed by the same compressive force, the sealable load is greatly increased as compared with the conventional gasket, and a sufficient elastic repulsion against the compressive load is obtained. Force (seal load)
Good sealability can be obtained by exhibiting the deformation, the range of deformation that can be sealed is expanded, elasticity fluctuates over a wide range, and good displacement followability is exhibited by exhibiting the expansion and contraction force according to the fluctuation of the compression load. Could be obtained. In addition, the gasket of the present application has a stronger elastic repulsion force (seal load) than the conventional gasket even with the same compression force.
Can be achieved, and the gasket can be made compact, which is extremely advantageous.

[0033]

According to the gasket of the present invention, each of the plurality of C-shaped portions is connected to another adjacent C-shaped portion to form a continuous cross-sectional shape. The backs of the respective C cross-sections are brought into contact with each other,
Press in the opposite direction. And each C cross-sectional shape part distributes the stress with respect to a compressive load, without concentrating on one point, and is responsible. Therefore, in the gasket of the present invention, it is possible to obtain a good sealing property by exerting an elastic repulsive force (seal load) against a compressive load, and to elastically fluctuate over a wide range to meet the fluctuation of the compressive load. Good displacement followability can be obtained by exerting the stretching force. Further, the connecting portion interposed between the respective C cross-sectional shape portions is connected to each adjacent C cross-sectional shape portion, so that a plurality of C cross-sectional shape portions can be continuous.
Further, since the connecting portion has an inverted C-shaped cross-section having an opposite shape to the C-shaped cross-section, the connecting portion bends when pressurized by a compressive load and bears a part of the compressive load, and the compression applied to the C-shaped cross-sectional shape is reduced. The load can be reduced. Still further, in the gasket of the present invention, a coating film provided by plating the surface of the gasket with silver plating and / or other soft plating or the like is provided at the contact portion of the member to be sealed at the application location. The sealing function is exerted by filling the gap at the surface roughness level, and the sealing property can be further improved.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing an embodiment of a gasket of the present invention.

FIG. 2 is a partial sectional view showing an uncompressed state when the gasket of FIG. 1 is mounted.

FIG. 3 is a partial cross-sectional view showing a compressed state when the gasket of FIG. 1 is mounted.

FIG. 4 shows a load-displacement curve A of the gasket of the present invention formed in a cross-sectional shape having two (plural) C-shaped cross-sections, and load-displacement curves B, B of a conventional gasket having only a single C-shaped cross section. ′.

[Explanation of symbols]

 8, 9 ... Seal target member 10 ... Gasket of the present invention 11 ... First C cross section 11a ... Edge 11b ... Back 11c ... Connecting portion 12 ... Second C cross section 12a ... connecting part 12b ... back 12c ... edge 13 ... connecting part A ... load-displacement curve of the present gasket B, B '... load-displacement curve of the conventional gasket Ax ... seal of the present gasket Possible deformation follow-up range Ay: Range of sealable load of the present gasket B'x: Range of deformable follow-up of conventional gasket B'y: Range of sealable load of conventional gasket

Claims (5)

[Claims] 1. A cross-sectional shape having a plurality of C cross-sectional shape portions, wherein each of the C cross-sectional shape portions is adjacent to another C cross-sectional shape portion.
A gasket characterized by being connected to a cross-section. 2. The C-shaped section according to claim 1, wherein the section is formed in a cross-sectional shape further having a connecting portion interposed between each of the C-shaped section portions, and the connecting portion is connected to each of the adjacent C-shaped section portions. gasket. 3. The gasket according to claim 2, wherein the connecting portion has an inverted C-shaped cross-section having an opposite shape to the C-shaped shaped portion. 4. The method according to claim 1, wherein a coating film is provided on the surface.
The gasket according to any one of claims 1 to 3. 5. The gasket according to claim 4, wherein the coating film is provided by performing a plating process.