A sealing gasket

Abstract

The present invention discloses a sealing gasket, which includes a support ring. The support ring has an inner ring body, a middle ring body and an outer ring body that are sequentially connected from the inside to the outside in the radial direction. Both axial end portions of the middle ring body protrude axially from the inner ring body and the outer ring body. Sealing rings are arranged on both axial end portions of the middle ring body. At least one axial end portion of the support ring is provided with an inner annular groove and an outer annular groove to form a deformation release groove. When the sealing gasket is used in a sealing device, when there is a radial displacement difference between the flanges on both sides of the sealing gasket due to different working temperature fields, it can automatically compensate for the deformation displacement difference, so that the sealing rings on both sides and the corresponding flanges are always kept in synchronous movement and contact relative rest with the sealing surfaces, so that there will be no mutual friction between the sealing surfaces to damage the sealing rings, ensuring continuous and effective sealing.

Description

Technical Field

[0001] The present invention relates to the field of sealing, and particularly to a sealing gasket. Background Art

[0002] In the fields of nuclear power, petrochemical, food, etc., traditional flange seals mainly use double-cone ring gaskets, octagonal (elliptical) gaskets, metal ring gaskets or metal wound gaskets, etc. Due to the different temperatures on both sides of the sealing connection flange, the flanges on both sides of the sealant undergo asynchronous deformation at different temperatures, resulting in a relative displacement difference in the radial direction of the flange sealing surface, and there is a risk of damage to the sealant or a decrease in the sealing stress, leading to seal failure. Summary of the Invention

[0003] The purpose of the present invention is to provide a sealing gasket for ensuring the sealing reliability when there is a relative displacement difference in the radial direction of the flange sealing surface in a sealing device.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a sealing gasket, the sealing gasket includes a support ring, the support ring has an inner ring body, a middle ring body and an outer ring body that are sequentially connected from the inside to the outside along the radial direction, both axial end portions of the middle ring body protrude axially from the inner ring body and the outer ring body, sealing rings are provided on both axial end portions of the middle ring body, at least one axial end portion of the support ring is provided with an inner annular groove and an outer annular groove, the inner annular groove is located on the inner ring body, the outer annular groove is located on the outer ring body, and the middle ring body is in contact with the inner annular groove and the outer annular groove along the radial direction.

[0005] Preferably, the groove widths and groove depths of the inner annular groove and the outer annular groove on the same axial end portion of the support ring are the same.

[0006] Preferably, both axial end portions of the support ring are provided with the inner annular groove and the outer annular groove.

[0007] Further, the groove depths, groove widths and their positions in the radial direction of the outer ring body of the two outer annular grooves on both axial end portions of the outer ring body are the same; the groove depths, groove widths and their positions in the radial direction of the inner ring body of the two inner annular grooves on both axial end portions of the inner ring body are the same.

[0008] Preferably, the thicknesses of the inner ring body and the outer ring body are the same, and / or, the heights of the axial end portions of the middle ring body protruding from the inner ring body / outer ring body are the same.

[0009] Preferably, annular seal ring installation grooves are provided on both axial end portions of the middle ring body, and the seal rings are cooperatively arranged in the seal ring installation grooves.

[0010] Further, the sealing ring is an O-ring or a packing ring.

[0011] Preferably, the part of the middle ring body protruding from the inner ring body and the outer ring body has a connecting part axially connected thereto, and a mounting part for mounting the sealing ring, and the radial thickness of the mounting part is greater than the radial thickness of the connecting part.

[0012] Further, the inner circumferential surface of the mounting part is an arc surface arched radially inward, and the outer circumferential surface of the mounting part is an arc surface arched radially outward.

[0013] Preferably, the inner ring body, the middle ring body and the outer ring body are of an integral structure.

[0014] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: for the sealing gasket of the present invention, when it is used in a sealing device, when there is a radial displacement difference between the flanges on both sides of the sealing gasket due to different working temperature fields, it can automatically compensate for the deformation displacement difference, so that the sealing rings on both sides and the corresponding flanges are always kept in synchronous movement and relative static contact with the sealing surfaces, thus preventing the sealing surfaces from rubbing against each other and damaging the sealing rings, and ensuring the continuous effectiveness of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Att Figure 1 is a longitudinal sectional view of the sealing gasket according to Embodiment 1 of the present invention;

[0016] Att Figure 2 is a longitudinal sectional view of the sealing device using the sealing gasket of Att Figure 1 , where the sealing gasket is not yet compressed;

[0017] Att Figure 3 is a longitudinal sectional view of the sealing device of Att Figure 2 after the sealing gasket is compressed and there is no radial displacement;

[0018] Att Figure 4 is a longitudinal sectional view of the sealing device of Att Figure 3 after the sealing gasket has a radial displacement;

[0019] Att Figure 5 is a longitudinal sectional view of the sealing gasket according to Embodiment 2 of the present invention;

[0020] Att Figure 6 is a longitudinal sectional view of the sealing gasket according to Embodiment 3 of the present invention;

[0021] Wherein: 100, the first flange; 101, the first flange surface; 102, the first mounting groove;

[0022] 200, the second flange; 201, the second flange surface; 202, the second mounting groove;

[0023] 300, Sealing gasket; 10, Support ring; 1, Inner ring body; 2, Middle ring body; 21, Connection part; 22, Installation part; 3, Outer ring body; 4, Inner annular groove; 5, Outer annular groove; 6, Sealing ring installation groove; 20, O-ring; 30, Packing ring. Specific embodiments

[0024] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Embodiment 1

[0026] Refer to Figure 1 The shown sealing gasket, which includes a support ring 10. The support ring 10 has an inner ring body 1, a middle ring body 2, and an outer ring body 3 that are sequentially connected from the inside to the outside along the radial direction. The inner ring body 1, the middle ring body 2, and the outer ring body 3 are of an integral structure to form the overall support ring 10. The support ring 100 can be made of metal or non-metal materials, such as stainless steel, PTFE and other materials. Among them, both axial end portions of the middle ring body 2 protrude axially from the inner ring body 1 and the outer ring body 3. Sealing rings are provided on both axial end portions of the middle ring body 2. Specifically, annular sealing ring installation grooves 6 are formed on both axial end portions of the middle ring body 2, and the sealing rings are cooperatively arranged in the sealing ring installation grooves 6. The material of the sealing ring can be metal or non-metal, specifically, the O-ring 20 used in this embodiment, or it can be a metal ring or a sealing packing ring, etc.

[0027] Inner annular grooves 4 and outer annular grooves 5 are formed on at least one axial end portion of the support ring 10. The inner annular groove 4 is formed on the inner ring body 1, and the outer annular groove 5 is formed on the outer ring body 3. The middle ring body 2 is connected to the inner annular groove 4 and the outer annular groove 5 along the radial direction. That is, the inner peripheral wall of the middle ring body 2 constitutes one side wall of the inner annular groove 4, and the outer peripheral wall of the middle ring body 2 constitutes one side wall of the outer annular groove 5.

[0028] In this embodiment, inner annular grooves 4 and outer annular grooves 5 are formed on both axial end portions of the support ring 10. On the same axial end portion of the support ring 10, the groove widths and depths of the inner annular groove 4 and the outer annular groove 5 are the same. And as a preferred design here, on both axial end portions of the outer ring body 3, the groove depths, groove widths, and their positions in the radial direction of the outer ring body 3 of the two outer annular grooves 5 are all the same; on both axial end portions of the inner ring body 1, the groove depths, groove widths, and their positions in the radial direction of the inner ring body 1 of the two inner annular grooves 4 are also all the same.

[0029] In this embodiment, the inner ring body 1 and the outer ring body 3 have the same thickness, and the axial end portions of both sides of the middle ring body 2 protrude from the inner ring body 1 / outer ring body 3 by the same height. The portion of the middle ring body 2 protruding from the inner ring body 1 and the outer ring body 3 has a connecting portion 21 connected axially, and a mounting portion 22 for mounting a sealing ring. The radial thickness of the mounting portion 22 is greater than the radial thickness of the connecting portion 21. Here, preferably, the mounting portion 22 is designed in a ball head shape. Specifically, the inner circumferential surface of the mounting portion 22 is an arc surface arched radially inward, and the outer circumferential surface of the mounting portion 22 is an arc surface arched radially outward. Of course, in other embodiments, the mounting portion 22 can also be set to a square or other shaped structure.

[0030] See Figure 2 、 Figure 3 The shown sealing device includes a first flange 100 having a first flange surface 101, a second flange 200 having a second flange surface 201, and a sealing gasket 300 for sealing connection between the first flange surface 101 and the second flange surface 201. A first mounting groove 102 is provided on the first flange 100, and a second mounting groove 202 is provided on the second flange 200.

[0031] The first flange 100, the second flange 200 and the sealing gasket 300 are coaxially arranged. The first flange 100 and the second flange 200 are axially pressed and connected by bolts. The sealing gasket 300 is pressed between the first flange 100 and the second flange 200. The inner ring body 1 and the outer ring body 3 of the sealing gasket 300 are supported between the first flange surface 101 and the second flange surface 201. The axial end portions of both sides of the middle ring body 2 are respectively arranged in the first mounting groove 102 and the second mounting groove 202 in a corresponding and mating manner, and the mounting portion 22 of the middle ring body 2 and the first mounting groove 102 / second mounting groove 202 are mutually matched. Specifically, the inner circumferential wall and the outer circumferential wall of the mounting portion 22 respectively form an arc surface contact with the circumferential groove walls of the first mounting groove 102 / second mounting groove 202. An O-ring 6 on the axial end portion of the middle ring body 2 and the bottom walls of the first mounting groove 102 and the second mounting groove 202 constitute a line seal. The inner annular groove 4 and the outer annular groove 5 communicate with the first mounting groove 102 / second mounting groove 202.

[0032] See Figure 4As shown, when the sealing device operates under high-temperature working conditions, if the temperature field on the side where the second flange 200 is located is higher than the temperature field on the side where the first flange 100 is located, then: during operation, since the inner ring body 1 and the outer ring body 3 are in contact with and supported by the first flange 100 and the second flange 200, the compression amount of the sealing ring can be restricted, making the sealing stress of the sealing ring constant; when there is a radial displacement difference on the sealing surfaces of the flanges on both sides of the sealing gasket 300 due to the asynchronous temperature fields, the first mounting groove 102 and the second mounting groove 202 on both sides of the sealing gasket 300 move radially out of sync, and the displacement difference between the second mounting groove 202 on the second flange 200 on the high-temperature side and the first mounting groove 102 on the first flange 100 on the low-temperature side is as Figure 3 shown in a of Figure 3 . At this time, due to the deformation release groove formed by the inner annular groove 4 and the outer annular groove 5, the parts of the middle ring body 2 protruding into the first mounting groove 102 and the second mounting groove 202 (i.e., the axial two ends of the middle ring body 2) can deflect and deform radially, so as to automatically follow the deflection of the first mounting groove 102 and the second mounting groove 202 radially to compensate for the deformation displacement difference, so that the sealing rings on both sides and the corresponding flanges are always in synchronous movement and relative rest in contact with the sealing surfaces, thus preventing the sealing surfaces from rubbing against each other and damaging the sealing rings, achieving the purpose of ensuring the continuous effectiveness of the sealing rings.

[0033] In this sealing gasket, the specific thickness of the connecting portion 21 should be determined according to the material of the sealing gasket and in combination with the actual working conditions, so that during use, when there is a relative radial displacement difference between the first flange 100 and the second flange 200, the connecting portion 21 can bend and deform radially so that the mounting portion 22 can swing radially outward and follow the deflection of the first mounting groove 102 and the second mounting groove 202 radially.

[0034] Embodiment 2

[0035] Refer to Figure 5 the sealing gasket shown. The main difference between this sealing gasket and the sealing gasket of Embodiment 1 is that an inner annular groove 4 and an outer annular groove 5 are provided on one of the axial end portions of the support ring 10. When this sealing gasket is installed in the sealing device, the axial end portion provided with the inner annular groove 4 and the outer annular groove 5 is connected to the flange with a higher working temperature, that is, connected to the second flange 200 with a higher working temperature field.

[0036] Embodiment 3

[0037] Refer to Figure 6 the sealing gasket shown. The main difference between this sealing gasket and the sealing gasket of Embodiment 1 is that the sealing ring used is a packing ring 30. When this sealing gasket is arranged in the sealing device, a surface seal is formed between the packing ring 30 and the bottom walls of the first mounting groove 102 and the second mounting groove 202.

[0038] The above embodiments are only used to illustrate the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It is not intended to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A sealing gasket, characterized in that: The sealing gasket includes a support ring which has an inner ring body, a middle ring body and an outer ring body that are sequentially connected to each other from the inside to the outside in the radial direction. Both axial end portions of the middle ring body protrude axially from the inner ring body and the outer ring body. Sealing rings are provided on both axial end portions of the middle ring body. At least one axial end portion of the support ring is provided with an inner annular groove and an outer annular groove. The inner annular groove is located on the inner ring body, and the outer annular groove is located on the outer ring body. The middle ring body is connected to the inner annular groove and the outer annular groove in the radial direction, so that the inner peripheral wall of the middle ring body forms one side wall of the inner annular groove, and the outer peripheral wall of the middle ring body forms one side wall of the outer annular groove. The part of the middle ring body protruding from the inner ring body and the outer ring body has a connecting portion connected axially and a mounting portion for mounting the sealing ring. The connecting portion can be bent and deformed in the radial direction so that the mounting portion can swing radially outward.

2. The gasket according to claim 1, wherein: The groove widths and groove depths of the inner annular groove and the outer annular groove on the same axial end portion of the support ring are the same.

3. The gasket according to claim 1, wherein: Both axial end portions of the support ring are provided with the inner annular groove and the outer annular groove.

4. The gasket according to claim 3, wherein: The groove depths, groove widths and their positions in the radial direction of the outer ring body of the two outer annular grooves on both axial end portions of the outer ring body are the same; the groove depths, groove widths and their positions in the radial direction of the inner ring body of the two inner annular grooves on both axial end portions of the inner ring body are the same.

5. The gasket according to claim 1, wherein: The thicknesses of the inner ring body and the outer ring body are the same, and / or the heights of the axial end portions of the middle ring body protruding from the inner ring body / outer ring body are the same.

6. The gasket according to claim 1, wherein: Both axial end portions of the middle ring body are provided with annular sealing ring mounting grooves, and the sealing rings are cooperatively arranged in the sealing ring mounting grooves.

7. The gasket according to claim 6, wherein: The sealing ring is an O-ring or a packing ring.

8. The gasket according to claim 1, wherein: The radial thickness of the mounting portion is greater than the radial thickness of the connecting portion.

9. The gasket according to claim 8, characterized in that: The inner peripheral surface of the mounting portion is an arc surface arched radially inward, and the outer peripheral surface of the mounting portion is an arc surface arched radially outward.

10. The gasket according to any one of claims 1 to 9, characterized in that: The inner ring body, the middle ring body and the outer ring body are of an integral structure.

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