JP2006266454A - Ring and sealing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cause no leakage of fluid having high temperatures and strong activeness. <P>SOLUTION: This sealing structure is composed of a first ring part 11 wound around the same diameter in a coiled state, a second ring part 13 wound around the same diameter in a coiled state while having a diameter smaller than the first seal ring 11, and a connecting part 15 integrally connecting the first and second ring parts 11, 13 each other and having a continuously changing radius. The periphery part 111 of the first ring 11 is brought into elastic contact with the inner periphery of a hole 53, and the inner periphery part 113 of the second ring part 13 is brought into elastic contact with the periphery of a shaft 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a ring for sealing a fluid and a seal structure.

  Conventional seals use oil seals, labyrinth seals, piston rings, and the like.

  However, the oil seal is not suitable as a sealing device for high temperature and strong fluid due to the material, and the labyrinth packing and the piston ring have gaps, so that fluid leaks frequently.

JP-A-6-193475

  The problem to be solved is that it is not possible to eliminate the leakage of high-temperature or highly active fluid with a simple structure.

  The present invention has a smaller diameter than the first ring part wound in the same diameter and the first ring part wound in the same diameter in order to eliminate the leakage of high temperature and strong active fluid. The main feature is that the second ring portion and the first and second ring portions are integrally connected to each other and the connecting portion has a continuously changing radius.

  The seal ring of the present invention includes a first ring portion wound in the same diameter in a coil shape, a second ring portion having a smaller diameter than the first ring portion wound in the same diameter in a coil shape, and the first ring portion , Because the second ring parts are joined together to form a joint part whose radius changes continuously, it has flexibility due to the structure in the radial direction. For this reason, even if there is a change in the shaft or housing diameter due to processing errors or thermal expansion, and there is misalignment of the shaft center, it is absorbed flexibly, ensuring adhesion between the shaft, hole and ring, and a good seal You can keep the sex.

  The purpose of eliminating leakage of high temperature and strong fluid was achieved with a simple structure.

[Outline of seal structure]
FIG. 1 is a cross-sectional view of a seal structure using a ring according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged cross-sectional view of the main part.

  As shown in FIGS. 1 and 2, 5 is a housing in which a high-temperature fluid is enclosed, 3 is a shaft that is axially positioned and rotatably mounted on the housing, 7 is a high-temperature fluid, and 9 is a shaft that rotates. A lever for showing. The seal ring 1 as a ring is attached between a shaft 3 rotatably attached to the housing 5 and is positioned in the axial direction by a step 33 of the shaft 3.

In FIG. 2, the outer peripheral portion 111 of the first ring portion 11 having a large diameter of the seal ring 1 is in close contact with the inner periphery of the hole 53 of the housing 5. Further, the inner peripheral portion 113 of the second ring portion 13 having a small diameter of the seal ring 1 is in close contact with the outer periphery 31 of the shaft 3.
[Seal ring]
3A is a cross-sectional view of the seal ring, and FIG. 3B is a front view thereof. As shown in FIG. 3, the first ring portion 11 of the seal ring 1 is formed by forming a strip-shaped thin plate such as a spring material having the same width and thickness into a coil shape and the same radius so that a part of the strip-shaped member overlaps. It has become.

  The second ring portion 13 is formed in the same manner as the first ring portion 11, but has a radius smaller than that of the first ring portion 11. Further, the first ring portion 11 and the second ring portion 13 are integrally connected by a coupling portion 15 whose radius gradually changes.

The number of turns of the first and second ring portions 11 and 13 and the coupling portion 15 can be selected from various types.
[Seal action]
Next, the characteristics of the seal ring 1 will be described with reference to FIG. Since the 1st, 2nd ring parts 11 and 13 are shape | molded by the strip | belt-shaped member at the coil shape, they have a softness | flexibility to radial direction. This is because the circumference is not restricted. Further, since the first and second ring portions 11 and 13 are connected by the coupling portion 15, they can be displaced in the radial direction by deformation of the coupling portion 15. For this reason, the inner peripheral portion of the hole 53 of the housing 5 and the outer peripheral portion of the shaft can be elastically brought into close contact with each other. Accordingly, the machining error of the diameter and the change due to thermal expansion are absorbed, and the shaft misalignment is allowed to follow the housing 5 and the shaft 3.

  Further, since the outer peripheral portion 111 and the inner peripheral portion 113 of the first and second ring portions 11 and 13 are formed so that the thin strip members are partially overlapped, a joint gap like a piston ring does not occur. .

  Further, the seal ring 1 is pressed in the axial direction by the pressure of the fluid, and the thin strip members are in close contact with each other without any gap. For this reason, good sealing performance can be exhibited.

In the case of a seal made of rubber or a part of plastic, a good sealing property is maintained by closely contacting a mating material such as a shaft by the flexibility of the material itself. However, such materials are not suitable for use at high temperatures or for special active fluid seals. The labyrinth packing and the piston ring can withstand use under high temperature, etc., but leakage is increased because of a gap in the seal portion.
On the other hand, in the seal ring 1 of the present invention, the adhesion to the mating member such as the housing 5 and the shaft 3 does not depend on the flexibility of the material itself, but depends on the radial flexibility and tolerance for eccentricity caused by the structure. For this reason, it does not require flexibility of the material itself, and it is possible to use materials such as metals, plastics, carbon, etc. that have high heat resistance, corrosion resistance, and wear resistance but are highly rigid. The combination with the material is also free. Therefore, according to the present invention, a seal having heat resistance, chemical resistance, and wear resistance can be produced. It is possible to further reduce leakage by using the ring in a multiple manner. Further, the first ring portion 11 and the second ring portion 13 are alternately connected in a double row by the connecting member 15, whereby the seal ring 1 having higher sealing performance is obtained.

Further, the seal ring 1 is pressed against the right side of FIG. For this reason, the end surface 133 of the seal ring 1 is pressed against the step 31 of the shaft, and the clearance between the contact portions can be eliminated.
Moreover, the said seal ring 1 does not have a joint gap like a piston ring.
Due to the above characteristics, good sealing properties can be secured.
2 because the first ring portion 11 is made slightly larger than the diameter of the hole 51 and the inner peripheral portion 113 is made slightly smaller than the outer diameter 31 of the shaft in FIG. This is because of the close contact with the inner periphery 53 of the housing 5 and the outer periphery 31 of the shaft 3 due to elasticity.
Further, even if the seal ring 1 is in close contact with the inner periphery 53 of the housing 5 or the outer periphery 31 of the shaft 3, the rotation of the shaft is not hindered. Because the seal ring 1 is formed in a coil shape, when the shaft 3 rotates in the loosening direction of the coil of the seal ring 1 as in a one-way clutch using a well-known coiled coil spring, Since the frictional force acts in the direction of expanding the radius of the seal ring 1, the shaft 3 is allowed to rotate while being kept at an appropriate contact pressure, and is fixed to the housing inner diameter 33. Further, when the shaft 3 rotates in the reverse direction, the ring 1 is tightened to the shaft outer diameter 31 and fixed to the shaft outer diameter 31 because the frictional force of the contact portion acts in a direction to reduce the radius. On the other hand, the contact portion with the housing inner diameter 53 allows sliding while maintaining an appropriate contact pressure. For this reason, in a use example in which the shaft swings, the seal ring 1 slides on both the outer periphery 31 of the shaft 3 and the inner periphery 53 of the housing 5, and the contact portion also moves for each operation. Slides uniformly. For this reason, the rotation of the shaft 3 is smooth, and the more familiar it is, the more familiar the effect is and the better the adhesion between them.

  As described above, according to the present invention, it is possible to seal a high-temperature fluid or a fluid having a strong corrosive activity with a simple structure, and further tolerate processing errors and thermal deformation of the housing and shaft, shaft misalignment, etc. It has the effect of providing a seal and a seal structure that are easy to use, excellent in reliability, and structurally inexpensive.

  In addition, although the ring of this invention was applied as a seal ring, of course, it can apply other than a seal ring.

(Example 1) which is sectional drawing of a seal structure. It is an expanded sectional view of the principal part (Example 1). (A) is sectional drawing of a seal ring, FIG.3 (b) is the same front view (Example 1).

Explanation of symbols

1 Seal ring (ring)
3 shaft 11 first ring portion 13 second ring portion 15 coupling portion 53 hole 111 outer peripheral portion 113 inner peripheral portion

Claims (2)

A first ring wound in the same diameter and coiled;
A second ring portion having a diameter smaller than that of the first ring portion wound in the same diameter and coiled;
A ring characterized in that the first and second ring portions are integrally connected to each other and a connecting portion whose radius changes continuously. The ring according to claim 1,
A seal structure in which an outer peripheral portion of the first ring portion elastically contacts an inner periphery of the hole, and an inner peripheral portion of the second ring portion elastically contacts an outer periphery of the shaft.

Images