JP5776930B2 - gasket - Google Patents

Description

The present invention relates to a gasket.
In particular, the present invention relates to a gasket suitably used for a fuel cell.

In recent years, there has been a demand for downsizing and cost reduction of devices in many fields, and this tendency is particularly strong in fuel cells, and the gaskets used in fuel cells are also reduced in size and cost. There is a strong demand.
Therefore, it has been proposed to use a gasket made of a rubber-like elastic material as a seal between the constituent elements of the fuel cell. (Patent Document 1)

However, this gasket has a wide thin plate shape, has insufficient sealing performance, and hinders downsizing because it takes up space.
In particular, in this type of conventional gasket, since it is necessary to perform groove processing on the mating member in order to compensate for the deterioration of the sealing performance, the problem of increasing the manufacturing cost is caused.

  If a gasket made of a single rubber-like elastic material is used without grooving the mating separator, etc., the assembly and positioning (handling) are not only poor, but the reaction gas or the like is sealed. The pressure of the fluid caused a displacement such as a shift of the gasket mounting position, resulting in a deterioration of the gasket sealing function.

JP 7-226220 A

  In view of the above points, the present invention provides a gasket that has no risk of shifting the gasket mounting position due to the pressure of the fluid to be sealed, can maintain a good sealing function, and has good assemblability and positioning (handling). The purpose is to.

In order to achieve the above object, according to the present invention, there is provided a gasket for sealing a gap between two members, an annular seal portion made of a rubber-like elastic material that is in sealing contact with the two members, and at least of the annular seal portion on one of the peripheral surfaces, as well as integrally molded metal frame, with to such at least one and as contact of the tip portion is the two members of the metal frame, the tip portion of the metal frame, the circumference choice distribution It is divided into a plurality of parts and is alternately bent in different directions so as to contact the two members alternately .

The present invention has the following effects.
According to the gasket of the first aspect of the present invention, there is no risk of shifting the mounting position of the gasket due to the pressure of the fluid to be sealed, a good sealing function can be maintained, and assemblability and positioning (handling) are good. At the same time, it is possible to more reliably avoid the risk of shifting the gasket mounting position due to the pressure of the sealed fluid.

Furthermore, according to the gasket of the invention of claim 2, wherein, it is not scratch the surface of the second member is a mating member.
Furthermore, according to the gasket of the invention of the third aspect , it is possible to more reliably avoid the risk of shifting the mounting position of the gasket due to the pressure of the sealed fluid.

Further, according to the gasket of the invention of claim 4 , since the tip portion is pressed so as to bite into the surface of the two members due to the pressure of the fluid to be sealed, the risk of shifting the mounting position of the gasket can be avoided more reliably.

The longitudinal cross-sectional view of the gasket which concerns on 1st Embodiment of this invention. The partial enlarged view which shows the use condition in which the gasket of FIG. 1 was compressed between two members. The longitudinal cross-sectional view of the gasket which concerns on 2nd Embodiment of this invention. The figure which showed 3rd Embodiment of this invention similarly to FIG.

Hereinafter, the best mode for carrying out the present invention will be described.
The best mode for carrying out the invention will be described with reference to FIGS.

<First Embodiment>
As shown in FIGS. 1 and 2, the gasket according to the first embodiment of the present invention includes a first member A and a second member B that are two members that do not move relative to each other, for example, each configuration of a fuel cell. This embodiment is a gasket for sealing a gap between elements, and an annular seal portion 1 made of a rubber-like elastic material that is in sealing contact with the two members A and B, and at least one peripheral surface of the annular seal portion 1 In FIG. 2, the metal frame 2 is integrally formed on the outer peripheral surface side, and the tip 21 of the metal frame 2 is in contact with at least one of the two members A and B.

  And the front-end | tip parts 21 and 21 of this metal frame 2 are divided | segmented into plurality by the slit cut equally on the circumference, are bent in a different direction alternately, and are the structure which touches two members A and B alternately. It has become.

  For this reason, since the contact pressure with respect to the two members A and B of the front end portions 21 and 21 of the metal frame 2 becomes uniform on the circumference, a good sealing function can be exhibited and the risk of shifting the mounting position of the gasket is more sure. Can be avoided.

In the present embodiment, the tip portions 21 and 21 of the metal frame 2 are in contact with both the two members A and B, but may be in contact with only one of them.

Further, as shown in FIG. 2, the angle α formed between the front end portion 21 of the metal frame 2 and the surface of the two members A and B on the pressure acting side (right side in the figure) is designed to be an acute angle. Yes.
As a result, the pressure of the sealed fluid acting on the gasket pushes the tip portions 21 and 21 so as to bite into the surfaces of the two members A and B, so the risk of shifting the gasket mounting position can be avoided more reliably. .

  The shape of the annular seal portion 1 is substantially circular in cross section, but may be substantially triangular, elliptical, trapezoidal or the like.

  In addition, as a material of the rubber-like elastic material gasket, rubber or a synthetic resin material having rubber-like elasticity is appropriately selected and used. Among them, liquid silicone rubber, liquid fluororubber, liquid EPDM, liquid ACM, etc. Liquid rubber is preferably used.

Further, the material of the metal frame 2 is appropriately selected from steel, stainless steel, aluminum, high-hardness material, and the like.
Since such a metal frame 2 is integrated with the rubber-like elastic annular seal 1, the rigidity of the entire gasket can be further increased, and the assembly and positioning (handling) until assembly is better. is there.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIG.
The difference from the first embodiment described above is that the end portions 21 and 21 of the metal frame 2 are covered with a rubber-like elastic material layer 211.
For this reason, since the front-end | tip parts 21 and 21 of the metal frame 2 can avoid contacting the 2 member A and B surface which is a partner member directly, the 2 member A and B surface is not damaged.

<Third Embodiment>
Next, a third embodiment of the present invention will be described with reference to FIG.
The difference from the first embodiment described above is that the tip portions 21 and 21 engage with the holes 3 and 3 provided in the two members A and B.
As a result, it is possible to more reliably avoid the risk of the gasket mounting position shifting due to the pressure of the sealed fluid.

  In the present embodiment, it is configured to engage with the holes 3 and 3 provided in the two members A and B, but may be configured to engage with the grooves provided in the two members A and B. , B may be provided with a hole 3 or a groove only in one of them.

  The present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

  It is suitably used for fuel cells.

DESCRIPTION OF SYMBOLS 1 Ring seal part 2 Metal frame 3 Hole 21 Tip part 211 Rubber-like elastic material layer

Claims (4)

A gasket for sealing a gap between two members (A) and (B), an annular seal portion (1) made of a rubber-like elastic material that is in sealing contact with the two members (A) and (B), and the annular seal The metal frame (2) is integrally formed on at least one peripheral surface of the portion (1), and the tip (21) of the metal frame (2) is connected to at least one of the two members (A) and (B). contact with to such as, wherein the distal end portion of the metal frame (2) (21), is divided into a plurality in the circumferential choice distribution, bent in different directions alternately, the two members (a), A gasket characterized by alternating contact with (B) . The gasket according to claim 1, wherein the tip (21) is covered with a rubber-like elastic material layer (211) . The gasket according to claim 1 or 2, wherein the tip (21) engages with a groove or hole provided in at least one of the two members (A) and (B) . The angle (α) formed by the tip (21) of the metal frame (2) and the surfaces of the two members (A) and (B) on which pressure acts is an acute angle. Item 3. The gasket according to any one of Items 1 to 3.

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