JPH04117957U - gasket - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a gasket that ensures sufficient sealing load and restorability, is easy to mold, and does not increase the set height. [Structure] A first flexible portion 11 having a U-shaped cross section symmetrical with respect to a plane O perpendicular to the axis, a pair of seal portions 12 protruding in the axial direction at both ends of this first flexible portion 11, and each seal. A second flexible portion 13 extends from the portion 12 in a shape symmetrical with respect to the plane O, and the lip-shaped pressure contact portions 14 at the tips thereof are in contact with each other.
The sealing load is obtained by the resultant force of the reaction force against the deformation of the first flexure part 11 and the second flexure part 13.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is a gasket that performs a sealing function between two opposing members, and is It relates to a cross-sectional shape that is bent symmetrically with respect to the object.

0002

[Conventional technology]

Conventionally, as shown in FIG. 7, a gasket 100 is axially symmetrical and has a substantially U-shaped cross section. Alternatively, as shown in FIG. 8, a gasket 110 having an axially symmetrical C-shaped cross section Are known. This type of gasket 100, 110 has a tendency to flex when not installed. The grooves 101 and 111 each have a shape that opens in the axial direction as shown by the broken lines in the figure. The state in which the mounting groove 3 between the opposing flanges 1 and 2 is bent and deformed in the axial direction reaction force against the deformation that occurs in the flexible portions 101 and 111 when the flexible portions 101 and 111 are compressed and mounted; Obtaining a self-sealing effect due to the pressure of the fluid to be sealed acting from the inner space 4, The seal parts 102 or 112 at both ends are pressed against the flanges 1 and 2, and the sealing machine Operates Noh.

0003 The seal load on the seal section varies depending on the structure of the flexible section, but The gaskets 100, 110 having the above-mentioned structure have a substantially constant shape, and the bending portions 101, 111 It varies depending on the length L. In other words, the wall thickness, material, pressure of the fluid to be sealed, etc. If the conditions are the same, the C-shaped gasket 110 has a shorter length L of the flexible portion 111. A larger sealing load can be obtained with the U-shaped gasket 100.

0004 However, the gasket 110 of FIG. 8 in which the length L of the flexible portion 111 is shortened, Although the sealing load can be increased, even if the amount of compression in the axial direction is small, the material The stress increases rapidly, and when this stress exceeds the yield point, plastic deformation occurs. , and it becomes impossible to follow the displacement between flanges 1 and 2, resulting in loss of sealing performance. On the other hand, the gasket 100 shown in FIG. Since the length L of the bending part 101 is long, the bending part 101 can be displaced within the elastic limit, resulting in a good Although it can ensure resilience, the sealing load is low and high sealing performance cannot be obtained. there were.

[0005] In addition, in order to deal with such problems, as shown in Fig. 9, the A cross section is provided inside the main body having a bent flexible portion 121 and seal portions 122 at both ends thereof. The spring members 123 bent in a U-shape are overlapped, and the deflection against the deflection deformation in the axial direction is When the sealing load is increased by the resultant force of the reaction forces of the groove part 121 and the spring member 123, Both have a laminated structure with sufficient length L of the flexible portion 121 to ensure good restorability. A gasket 120 is known.

[0006] However, this gasket 120 has a structure in which a plurality of members are laminated closely together. Not only does it require advanced forming techniques to bend into a shape, but gaskets generally is required to make the set height H as small as possible. According to the document 120, such a request could not be satisfied.

[0007]

[Problem that the idea aims to solve]

Therefore, in view of the above-mentioned problems, this invention aims to ensure sufficient sealing load and restorability. At the same time, it is a gasket that does not require advanced molding technology and does not increase the set height. This was done with the aim of providing a wide range of services.

[0008]

[Means to solve the problem]

In order to solve the above problems, the gasket of this invention is A first flexible section having a symmetrical U-shaped cross section, and a first flexible section protruding in the axial direction at both ends of the first flexible section. a pair of seal parts, and a tip extending from each seal part in a symmetrical shape with respect to the plane. The lip-shaped press-contact part has a second bending part that contacts each other. Ru.

[0009]

[Effect]

In the gasket with the above configuration, the compressive load from the mating member that comes into contact with both seals is When acting in the The second flexure portions where the lip-shaped pressure contact portions are in pressure contact with each other are also subjected to flexure deformation, and these first A large The seal load can be increased by shortening the length of the flexible part or by reducing the plate length. Since it is not dependent on an increase in thickness, the elastic deformation range is wide enough to provide sufficient followability. can be secured.

0010

【Example】

A gasket 10 according to a first embodiment of the present invention shown in FIG. 1 includes a first bending portion 11 having a long U-shaped cross section and having a bending length _L1 , which is folded back symmetrically with respect to a plane O perpendicular to the axis; A pair of seal parts 12 protrude in the axial direction from both ends of the first flexible part 11, and a lip-shaped pressure contact part 14 extends from each seal part 12 in a tapered shape symmetrical with respect to the plane O and is curved at the tip. A flange 1 of two members facing each other has a second flexure part 13 formed in the second flexure part 13 whose flexure length L ₂ is shorter than L ₁ and a required number of pressure guiding holes 15 formed in the second flexure part 13 . The seal portions 12, 12 are installed in the installation groove 3 between the flanges 1, 2, and perform a sealing function against internal pressure.

[0011] According to this gasket 10, when the gasket 10 is not installed, the first and second flexible portions 11 and 13 have a shape that is open in the axial direction as shown in FIG. Either in contact under load or out of contact. When a compressive load F in the axial direction is applied to both seal portions 12, the first flexible portion 11 is deflected and deformed as shown by the broken line in the figure, and the lip-shaped pressure contact portions 14 are in pressure contact with each other. As a result, the second bending portion 13 is also deflected, and a large sealing load is applied to both the seal portions 12, 12 by the resultant force of the reaction forces generated in the first and second bending portions 11, 13. That is, since the sealing load is increased without depending on the shortening of the length L ₁ of the first flexible portion 11, good restorability against deformation can be ensured.

0012 Further, the pressure guiding hole 15 formed in the second flexible portion 13 is surrounded by both flexible portions 11 and 13. The pressure of the fluid to be sealed on the inner peripheral side is introduced into the internal space 16 of the gasket 10. , thereby balancing the pressure of the second flexure part 13 and reducing the introduction pressure. acts on the first flexible portion 11 from the inside and connects both seal portions 12, 12 to the flanges 1, 2. This provides a self-sealing effect that allows pressure contact.

[0013] This gasket 10 is made by bending a single plate made of metal or resin material. The first flexible part 11, the seal part 12, the second flexible part 13, and the lip-shaped pressure contact part 14 are connected. The laminated type gasket shown in Fig. 9 can be formed by polymerizing multiple members because it can be formed continuously. It does not require advanced molding technology like 120, and is a molded product made of a single plate. Therefore, the set height H should be made sufficiently smaller than the laminated gasket 120. can save space.

The magnitude of the sealing load on the sealing portion 12 can be arbitrarily set by the length L ₂ of the second flexible portion 13 . For example, in the second embodiment of the present invention shown in FIGS. 3 and 4, the second bending portion 13 has a substantially J-shaped cross section that is symmetrical with respect to the plane O perpendicular to the axis, and the bending length L ₂ is The length _L1 of the first flexible portion is approximately the same, and the sealing load is smaller and the elastic deformation region is larger than in the previous embodiment in which the second flexible portion 13 is tapered. .

[0015] Further, in a third embodiment of the present invention shown in FIGS. 5 and 6, the second flexible portion 13 is Fold toward the inside of the flexible part 11 into a tapered shape symmetrical to the plane O perpendicular to the axis. This allows the system to be installed without increasing the installation space in the radial direction of the gasket 10. It is possible to increase the roll load and the elastic deformation area.

[0016] Note that the gasket 10 of each of the above embodiments is particularly suitable for cases where the gasket 10 is made of metal. If the surface is coated or plated with a sealing material made of other metal or resin. It is preferable to do so. In addition, in each of the above embodiments, the sealing fluid is located on the inner circumferential side. It is used as a seal for internal pressure, but the cross-sectional shape is different from the one shown on the left and right. By making the shape the opposite, it can be used for external pressure when the fluid to be sealed is present on the outer periphery. The bending shape and size of other details, plate thickness and material can be configured as a etc. are not particularly limited.

[0017]

[Effect of the idea]

As described above, the gasket of the present invention is characterized by the reaction force caused by the deformation of the first flexible part and the reaction force caused by the deformation of the second flexible part. Due to the resultant force with the reaction force caused by the deformation of the Since the seal load is increased without the need for It is possible to secure the originality and improve followability, and it is also made by continuous molding of veneer. Therefore, compared to the case where the seal load and restorability are improved by a laminated structure, It is easy to mold, and the set height can be reduced to save space. It has excellent effects such as:

[Brief explanation of drawings]

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

FIG. 2 is a partial cross-sectional view of the device in an unattached state.

FIG. 3 is a partial sectional view showing a second embodiment of the gasket of the present invention in an installed state.

FIG. 4 is a partial cross-sectional view of the device in an unattached state.

FIG. 5 is a partial sectional view showing a third embodiment of the gasket of the present invention in an installed state.

FIG. 6 is a partial cross-sectional view of the device in an unattached state.

FIG. 7 is a partial sectional view showing a conventional U-shaped gasket in an installed state.

FIG. 8 is a partial sectional view showing a conventional C-shaped gasket in an installed state.

FIG. 9 is a partial sectional view showing a conventional laminated gasket in an installed state.

[Explanation of symbols]

10 Gasket 11 First bending part 12 Seal part 13 Second bending part 14 Lip-shaped pressure welding part 15 Pressure conducting hole 16 Internal space O plane perpendicular to axis

Claims (1)

[Scope of utility model registration request] [Claim 1] A cross section U that is symmetrical with respect to a plane perpendicular to the axis.
a pair of seal parts protruding in the axial direction at both ends of the first bending part, and a lip-shaped pressure contact part at the tip extending from each seal part in a shape symmetrical with respect to the plane. and second flexible portions that are in contact with each other.