JPH10109760A - Seal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent the leakage of the gas, etc., without promoting the wear of a sealing material or causing creep damage of a back-up material. SOLUTION: Projections 2c, 2d are provided on one surface 2a of a back-up material 2 so that the contact bearing surface generated between one surface 2a of the back-up material 2 and the other surface 1b of a sealing material 1 is concentrated on the projections 2c, 2d. A cut groove 2e is provided on the other surface 2b of the backup material 2 so that the contact bearing pressure generated between the other surface 2b of the back-up material and a sealing material fitting part 3 is concentrated on each end part of the cut groove 2e.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a seal structure,
It is useful when applied to a seal structure such as a rotary valve.

[0002]

2. Description of the Related Art FIG. 2 is a cross-sectional view showing the structure of a main part of a rotary valve having a conventional sealing structure, FIG. 3 is a longitudinal sectional view showing the structure of a main part of the rotary valve, and FIG.
FIG. 4 is an enlarged view of a portion A (seal structure portion) in FIG. 3.

As shown in FIGS. 2 and 3, the rotary valve is generally frustoconical and has a casing 6.
Has a rotor shaft 12 therein. The casing 6 has a supply port 10 and a discharge port 11 at the top and bottom in the figure, and rotatably supports a rotor shaft 12 via a bearing 14. On the other hand, a number of pockets 9 are formed on the outer periphery of the rotor shaft 12 by providing the protrusions 12 around the rotor shaft 12.

[0004] These pockets 9
A seal member 28 called a side seal fitted to a seal member fitting portion 3 provided at both ends of the vane seal 7 in the axial direction (horizontal direction in FIG. 3) is provided by the vane seal 7 provided at the tip end of 2a. , The circumferential direction and the axial direction are each sealed.

[0005] Accordingly, the rotary valve has the above-described configuration, so that the raw material 15 supplied from the supply port 10 into the pocket 9 is transported to the opposite side by the rotation of the rotor shaft 12 and discharged from the discharge port 11. . Then, gas leaks from each pocket 9 in the circumferential direction and the axial direction are as follows.
It is prevented by the vane seal 7 and the seal member 28.

Here, the axial sealing of the pocket 9 will be described in detail with reference to FIG.

As shown in FIG. 4, the sealing member 28 is a combination of an outer (casing 6 side) sealing material 21 and an inner (seal member fitting portion 3 side) backup material 22. It is fitted into a concave portion 3 a formed on the outer peripheral surface of the fitting portion 3, and is interposed between the seal member fitting portion 3 and the casing 6.

For this reason, the gas in the pocket 9 is
a, 13b, 13c, the casing 6 and the sealing material 2
1 between the other surface 21a, between the other surface 21b of the sealing material 21 and one surface 22a of the backup material 22, and between the other surface 22b of the backup material 22 and the seal member fitting portion 3. The gas leaks between the casing 6 and the seal member fitting portion 3 by adjusting the distance between the casing 6 and the seal member fitting portion 3 so that the seal member 28 is pressed against the casing 6 so that the gas leaks. This is prevented by generating surface pressure.

[0009]

However, the conventional sealing structure has the following problems.

(1) The sealing performance against gas leak is determined by the contact surface pressure of each part of the sealing structure.
Compared with the contact surface pressure generated between the casing 6 and the one surface 21a of the sealing material 21, the other surface 2 of the sealing material 21
1b and one surface 22a of the backup material 22 and the contact surface pressure generated between the other surface 22b of the backup material 22 and the seal member fitting portion 3 are lower, so that gas is supplied from between them. Will leak.

(2) On the other hand, in order to prevent this gas leak, the space between the casing 6 and the seal member fitting portion 3 is narrowed to increase the pressing force of the seal member 8.
When the contact surface pressure between the other surface 21b of the sealing material 21 and the one surface 22a of the backup material 22 and between the other surface 22b of the backup material 22 and the sealing member fitting portion 3 is increased, the casing 6 One surface 21 of the sealing material 21
a becomes too large, and as a result, abrasion of the sealing material 1 is promoted, and the life of the sealing material 1 becomes short.

(3) In addition, due to the restriction of preventing the creep damage of the backup member 22 and the like, the compression allowance of the seal member 28 is extremely small. Therefore, the distance between the casing 6 and the seal member fitting portion 3 is almost constant. There is a need. Therefore,
This also makes it impossible to increase the contact surface pressure by reducing the distance between the casing 6 and the seal member fitting portion 3, and it is difficult to prevent the gas leak.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a seal structure capable of reliably preventing gas or the like from leaking without accelerating abrasion of the seal material or causing creep damage of the backup material. And

[0014]

Means for Solving the Problems A first method for solving the above problems is described below.
The sealing structure according to the invention is characterized in that, between the first member and the second member, a sealing material having one surface in contact with the first member and one surface in contact with the other surface of the sealing material. A seal structure in which the other surface is provided with a seal member in combination with a flexible backup material in contact with the second member, wherein a projection is provided on one surface of the backup material,
The projection is configured such that one surface of the backup material and the other surface of the sealing material are in contact with each other.

In a second aspect of the present invention, there is provided a seal structure, wherein one surface is in contact with the first member and one surface is between the first member and the second member. A seal member in which a seal member combining a flexible backup material in contact with the other surface and the other surface in contact with the second member is provided, and the other surface of the backup material is It is characterized in that a kerf is provided.

Therefore, according to the seal structure of the first aspect of the present invention, since the projection is provided on one surface of the backup material, the projection is provided on one surface of the backup material and the other surface of the seal material. The contact surface pressure generated between the first member and the first member is larger than the contact surface pressure generated between the first member and one surface of the sealing material.

Further, according to the seal structure of the second aspect of the present invention, since the cut surface is provided on the other surface of the backup material, the other surface of the backup material and the second surface are provided at both ends of the cut groove. Since the contact surface pressure generated between the first member and the sealing member is higher than the contact surface pressure generated between the first member and the sealing member, the contact surface pressure is larger than the contact surface pressure generated between the first member and the sealing member. In addition, since the cut groove serves as an allowance for deformation during compression, the compression allowance of the seal member can be increased.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a vertical cross-sectional view (cross-sectional view corresponding to FIG. 4) showing a seal structure portion of a rotary valve having a seal structure according to an embodiment of the present invention. The other components of the present rotary valve other than the seal structure shown in FIG. 1 are the same as those of the conventional rotary valve, and the description thereof will be omitted. In FIG. 1, the same parts as those in the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 1, the outside (casing 6
A seal member (side seal) 8 is formed by combining the seal member 1 on the side) and the backup member 2 on the inner side (the seal member fitting portion 3 side). , And is interposed between the seal member fitting portion 3 and the casing 6. Therefore,
The casing 6 contacts one surface 1a of the sealing material 1, the other surface 1b of the sealing material 1 contacts one surface 2a of the backup material 2 (described in detail later), and the other surface 2b of the backup material 2 seals. The member fitting portion 3 contacts (details will be described later).

The seal member 1 is formed of synthetic resin, and the backup member 2 is formed of synthetic rubber and has flexibility.

Then, one surface 2a of the backup material 2
Projections 2c, 2d along the circumference are formed at both ends in the axial direction (left-right direction in the figure).
In the portion, one surface 2a of the backup material 2 and the other surface 1b of the sealing material 1 are in contact. The projections 2c, 2
The cross-sectional shape of d is an arc, but its tops 2c-1 and 2c-2
d-1 is flat, thereby avoiding line contact with the other surface 1b of the sealing material 1 and preventing creep damage.

A cut groove 2e is formed along the circumference at the axial center of the other surface 2b of the backup material 2.

Therefore, according to the seal structure having the above structure,
When the distance between the casing 6 and the sealing member fitting portion 3 is adjusted and the sealing member 8 is pressed against the casing 6, the gap between the casing 6 and one surface 1 a of the sealing member 1 and the sealing member 1 are reduced.
Contact surface pressure is generated between the other surface 1b of the backup material 2 and one surface 2a of the backup material 2 and between the other surface 2b of the backup material 2 and the seal member fitting portion 3. The projections 2c and 2d are provided on one surface 2a of the first member 2 so that the contact surface generated between the other surface 1b of the sealing material 1 and the one surface 2a of the backup material 2 is provided on these projections 2c and 2d. Since the pressure is concentrated, the contact surface pressure is larger than the contact surface pressure generated between the casing 6 and the one surface 1a of the sealing material 1.

For this reason, the contact surface pressure between the casing 6 and the one surface 1a of the sealing material 1 is excessively increased to promote the wear of the sealing material 1 or to cause the backup material 2 to creep. Gas leakage (see arrow 13b) between the other surface 1b of the sealing material 1 and the one surface 2a of the backup material 2 can be reliably prevented without performing.

Furthermore, by providing two projections 2c and 2d to form a double seal, even if one projection is damaged, gas leakage can be prevented by the other projection, so that reliability is improved. high. Further, the projections 2c, 2d
Are provided at both ends in the axial direction of one surface 2a of the backup material 2, so that powder or the like is filled between the other surface 1b of the sealing material 1 and the one surface 2a of the backup material 2. Can be prevented as much as possible.

Further, since the cut surface 2e is provided on the other surface 2b of the backup material 2, the gap between the other surface 2b of the backup material 2 and the seal member fitting portion 3 is provided at both ends of the cut groove 2e. Is generated, the contact surface pressure is larger than the contact surface pressure generated between the casing 6 and the one surface 1a of the sealing material 1.

For this reason, the contact surface pressure between the casing 6 and the one surface 1a of the sealing material 1 is excessively increased to promote the wear of the sealing material 1 and to cause the backup material 2 to creep. Without this, gas leak (see arrow 13c) between the other surface 2b of the backup material 2 and the seal member fitting portion 3 can be reliably prevented. In addition, since the contact surface pressure concentrates on both ends of the cut groove 2e (that is, the peak of the contact surface pressure becomes two places), a double seal is obtained, and the reliability is high.

Further, since the cut groove 2e serves as a margin for deformation during compression, the compression margin of the seal member 8 can be increased. For this reason, the casing 6 and the seal member fitting portion 3
The margin for adjusting the distance between the contact surface and the contact surface becomes large, and the contact surface pressure can be appropriately increased. That is, the margin for adjusting the contact surface pressure increases.

In the above description, two projections are provided on the backup material. However, the present invention is not limited to this.
The number of projections may be one or three or more. Further, the position and shape of the projection are not necessarily limited to the above-described position and shape, and can be set as appropriate.

The number, position, and shape of the cut grooves provided in the backup material are not limited to the number, position, and shape as described above, and can be set as appropriate.

In the above, the case where the present invention is applied to a rotary valve has been described. Of course, the present invention is not limited to this, and the present invention provides a seal structure having a seal member using an elastic or flexible material such as rubber or resin. It can be widely applied to sealing structures of various devices and structures. For example, the present invention can be applied to a seal structure of a cylindrical or frustoconical rotary body other than a rotary valve, or a seal structure such as a lid of an airtight container or a door of an airtight chamber.

[0033]

As described above in detail with the embodiments of the present invention, according to the seal structure of the present invention, since the projection is provided on one surface of the backup material, the sealing material is provided on the projection. The contact surface pressure generated between the other surface of the first member and the one surface of the backup material is concentrated, and the contact surface pressure is generated between the first member and one surface of the seal material. It becomes larger than the contact surface pressure. For this reason, the contact surface pressure between the casing and one surface of the sealing material is excessively increased, thereby accelerating the wear of the sealing material and without causing creep damage of the backup material to the other side of the sealing material. Leakage of gas or the like between the surface and one surface of the backup material can be reliably prevented.

In addition, since the contact surface pressure is concentrated on the projections, the number of projections can be increased and the seals can be multiplexed, thereby improving the reliability.

Further, since the cut surface is provided on the other surface of the backup material, contact surface pressure generated between the other surface of the backup material and the second member is concentrated on both ends of the cut groove. Therefore, the contact surface pressure is larger than the contact surface pressure generated between the first member and one surface of the sealing material. For this reason, the contact surface pressure between the casing and one surface of the sealing material is excessively increased, thereby promoting the wear of the sealing material and without causing the creep damage of the backup material to occur. Leakage of gas or the like between the surface and the seal member fitting portion can be reliably prevented.

Further, since the contact surface pressure is concentrated on both ends of the cut groove, a double seal is obtained, and the reliability is high.

Further, since the cut groove serves as an escape allowance for deformation during compression, the allowance for compression of the seal member can be increased. For this reason, the margin for adjusting the distance between the casing and the seal member fitting portion increases, and the margin for adjusting the contact surface pressure also increases.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view (cross-sectional view corresponding to FIG. 4) illustrating a seal structure portion of a rotary valve having a seal structure according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a main part of a rotary valve having a conventional seal structure.

FIG. 3 is a longitudinal sectional view showing a configuration of a main part of the rotary valve.

FIG. 4 is an enlarged view of a portion A (seal structure portion) in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seal material 1a One surface of seal material 1b The other surface of seal material 2 Backup material 2a One surface of backup material 2b The other surface of backup material 2c, 2d Projection 2e Cut groove 3 Seal member fitting part 6 Casing 8 Seal member

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yoshiharu Arai 12 Nishikicho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Heavy Industries, Ltd. Yokohama Works (72) Inventor Wei Onishi 1-8-1, Koura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Inside Mitsubishi Heavy Industries, Ltd.Yokohama Research Laboratories (72) Inventor Aiko Kikuchi 1-8-1, Koura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Inside Mitsubishi Heavy Industries, Ltd.Yokohama Research Laboratories Address 1 Inside the Yokohama Research Laboratory, Mitsubishi Heavy Industries, Ltd.

Claims (2)

[Claims] A sealing member having one surface in contact with the first member, and one surface in contact with the other surface of the sealing member, between the first member and the second member; A seal structure having a seal member in which a surface is combined with a flexible backup material in contact with the second member, wherein a projection is provided on one surface of the backup material, and A seal structure wherein one surface of a backup material and the other surface of the seal material are in contact with each other. 2. A seal member having one surface in contact with the first member and one surface in contact with the other surface of the seal member between the first member and the second member. A seal structure having a seal member in which a surface is combined with a flexible backup material in contact with the second member, wherein a cut groove is provided on the other surface of the backup material. Seal structure.