JPH04110265U - C type seal - Google Patents

Abstract

(57) [Summary] [Purpose] Reduce the elastic modulus at each bend and stabilize the sealing performance. [Structure] A C-shaped seal 11 having a substantially polygonal ring shape in plan view and having continuous opening grooves 14 facing inward or outward with respect to the bending direction, the opening grooves 14 having a C-shaped cross section. Thickness t ₁ of the base curved wall surface 11a on the opposite side
is made thinner in the bent portion 12 than in the non-bent portion 13.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention has a planar shape that extends into a polygon, and mediates a compressed state between two opposing members. The present invention relates to a metal seal with a C-shaped cross section that performs sealing.

0002

[Conventional technology]

Conventionally, as shown in FIGS. 4 and 5, the bending portion 2 serving as each vertex is rounded. It has an approximately polygonal (approximately square in the figure) ring-like planar shape, and It has a C-shaped cross section with a continuous opening groove 4 around the side, and forms, for example, a pressure vessel 6. It is inserted in a groove 9 formed between the flanges 7 and 8 of the two opposing members, and It is suitably compressed into both flanges 7 and 8, and into the hollow part 5 through the opening groove 4. A metal seal that seals by a self-sealing action that utilizes the pressure of the fluid introduced. A C-shaped seal 1 is known.

0003

[Problem that the idea aims to solve]

However, according to the above conventional structure, the bent portion 2 is The elastic modulus against compression is large, and in comparison, the part corresponding to each side of the polygon Since the elastic modulus of the non-bending part 3 is extremely small, it is necessary to provide an appropriate tightening margin for the non-bending part 3. In order to apply this, the tightening force of both flanges 7 and 8 to the bent portion 2 is increased. Also, the pressure contact force with the flanges 7 and 8 is more significant in the bent part 2 than in the non-bent part 3. As the flanges 7 and 8 become larger, uneven distortion occurs on the opposing surfaces of the flanges 7 and 8, resulting in poor sealing performance. was having a negative impact.

0004 Therefore, in view of the above-mentioned problems, the present invention has developed an elastic modulus for compression at each bend. This was done with the aim of reducing the number of seals and stabilizing the sealing performance. be.

[0005]

[Means to solve the problem] In order to solve the above problems, the present invention has a planar shape approximately polygonal ring-shaped and bends. It is a C-shaped seal with a continuous opening groove facing inward or outward in the direction. Then, the thickness of the base curved wall surface on the opposite side to the opening groove in the C-shaped cross section is set to be smaller than that of the non-bent part. The rim is also thinner at the bend.

[0006]

[Effect]

The C-shaped seal depends on the elasticity of the base curved wall surface on the opposite side to the opening groove in the C-shaped cross section. Therefore, a reaction force is generated against compression, and according to the above configuration, this base curved wall surface Since the wall thickness of the bent part is made thinner than that of the non-bent part, the elastic modulus of the bent part decreases and the non-bent part decreases. The difference with the elastic modulus of the bent portion can be alleviated.

[0007]

【Example】

Next, the C-shaped seal of the present invention will be described with reference to an embodiment shown in FIGS. 1 to 3. This metal C-shaped seal 11 extends in a substantially square planar shape, and has an inner side in the bending direction. As shown in FIGS. 2 and 3, the base curved wall surface 11a on the opposite side to the opening groove 14 in the C-shaped cross section is formed with a continuous opening groove 14 around the C-shaped cross section. The wall thickness t ₁ of the rounded bent portion 12 corresponding to each vertex portion is thinner than the wall thickness t ₂ of the non-bent portion 13 corresponding to each side of the square.

[0008] Therefore, the C-shaped seal 11 has a base that can withstand compressive loads from the top and bottom directions in the figure. The reaction force due to the elasticity of the curved wall surface 11a decreases at the bent portion 12, and The difference in elastic modulus of the non-bending portion 13 is alleviated.

In the above embodiment, the wall thickness t ₁ of the bent portion 12 is made thin by smoothly grinding the outer surface of the base curved wall surface 11a, as shown by the broken line in FIG. It is also possible to make the base curved wall surface 11a thin by grinding it from the hollow portion 15 side or by rolling it with a press means.

0010 The illustrated embodiment has a substantially square planar shape and is for internal pressure use. Although the invention was applied, the invention was also applied to other polygonal shapes such as approximately rectangular shapes. Regarding the one for external pressure in which the mouth groove 14 is provided around the outside with respect to the bending direction of the bending part 12. Of course, the same structure can be used.

Furthermore, the thickness t ₁ of the base curved wall surface 11a in each bent portion 12 and the range (length) in which the base curved wall surface 11a is thinned are determined by the bending angle and radius, which vary depending on the number of bent portions 12. The elastic coefficient of the bent part 12 can be approximated to the elastic modulus of the non-bent part 13 by taking into account the curvature of the curve or the thickness t ₂ of the non-bent part 13 .

0012

[Effect of the idea]

As described above, according to the present invention, the elastic modulus of each bending part under compressive load is By forming the curved wall surface of the base thin, it is possible to reduce the This makes it possible to reduce the tightening force of the mating member, and also to reduce the The difference in the elastic modulus of the non-bent part is alleviated to prevent uneven distortion of the contact surface of the mating member. It can exhibit excellent sealing performance.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part taken along a bent portion.

FIG. 3 is a cross-sectional view of the main part of the same, taken through a non-bent portion.

FIG. 4 is a perspective view showing an example of a conventional structure.

FIG. 5 is a cross-sectional view of the main parts in the attached state.

[Explanation of symbols]

11 C type seal 11a Base curved wall surface 12 Bent part 13 Non-bending part 14 Opening groove

Claims (1)

[Scope of utility model registration request] 1. A C-shaped seal having a substantially polygonal ring shape in plan view and having continuous opening grooves facing inward or outward with respect to the bending direction, the seal having a C-shaped seal having a substantially polygonal ring shape and having continuous opening grooves facing inward or outward in the bending direction. A C-shaped seal characterized in that the thickness of the curved wall surface of the base on the opposite side is thinner at the bent portion than at the non-bent portion.