CN110792775A

CN110792775A - Sealing gasket

Info

Publication number: CN110792775A
Application number: CN201911162388.4A
Authority: CN
Inventors: 马志刚; 韩嘉兴
Original assignee: Suzhou Bao Hua Sealing Polytron Technologies Inc
Current assignee: Suzhou Bao Hua Sealing Polytron Technologies Inc
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-02-14

Abstract

The invention discloses a sealing gasket, which comprises a first ring and a second ring which are coaxially stacked, and a stress release ring welded and fixed between the inner side periphery of the first ring and the inner side periphery of the second ring, wherein the longitudinal section of the stress release ring is C-shaped, when the sealing gasket is used in a sealing device, when flanges at two sides of the sealing gasket generate radial displacement difference due to different working temperature fields, the first ring and the second ring are always kept sealed through the deformation of the stress release ring, so that the first sealing ring and the second sealing ring always keep synchronous movement, contact and relative rest with the respective contacted sealed surfaces, abrasion is avoided, the sealing surfaces cannot rub against each other to damage the sealing rings, and the sealing is kept effective.

Description

Sealing gasket

Technical Field

The invention relates to the field of sealing, in particular to a sealing gasket.

Background

In fields such as nuclear power, petrochemical industry, food, traditional flange seal mainly adopts bipyramid ring pad, octagon (ellipse) pad, metal ring pad or metal winding gasket etc. because sealing connection flange both sides temperature is different, the asynchronous deformation takes place for the flange of sealing member both sides under the temperature of difference, and the flange seal face produces relative displacement difference in radial direction, exists and causes the sealing member damage or sealed stress decline and lead to the risk of sealed inefficacy.

Disclosure of Invention

The invention aims to provide a sealing gasket to compensate relative displacement difference generated by a flange sealing surface in a radial direction and ensure the reliability of sealing.

In order to achieve the purpose, the invention adopts the technical scheme that: a sealing gasket comprises a first ring and a second ring which are coaxially stacked, wherein a first sealing ring is arranged at the outer side shaft end of the first ring, a second sealing ring is arranged at the outer side shaft end of the second ring, the sealing gasket further comprises a stress release ring, the longitudinal section of the stress release ring is in a C shape which is arched outwards along the radial direction, a first arc-shaped groove is formed in the inner side circumference of the first ring, a second arc-shaped groove is formed in the inner side circumference of the second ring, the first arc-shaped groove and the second arc-shaped groove are matched with each other to form a containing space for containing the stress release ring, the shaft ends at two sides of the stress release ring are welded and fixed to the first ring and the second ring along the circumferential direction respectively, and a gap is formed between the outer side circumference of the stress release ring and the circumferential groove wall of the first arc-shaped groove.

Preferably, the outer circumferential surface of the stress release ring and the circumferential groove wall of the second arc-shaped groove are in mutual contact.

Preferably, the gap between the outer circumferential surface of the stress release ring and the circumferential groove wall of the first arc-shaped groove is gradually increased along the axial direction of the first ring from outside to inside.

Preferably, one of the inner shaft end of the first ring and the inner shaft end of the second ring is provided with an annular boss, the other one of the inner shaft end of the first ring and the inner shaft end of the second ring is provided with an annular groove, the radial thickness of the annular boss is smaller than the radial width of the annular groove, and the annular boss is correspondingly inserted into the annular groove.

In a preferred embodiment, the annular projection is provided on the first ring, the annular groove is provided on the second ring, and an inner peripheral surface of the annular projection and an inner peripheral wall of the annular groove are provided with a gap therebetween.

In another preferred embodiment, the annular groove is provided on the first ring, the annular projection is provided on the second ring, and an outer peripheral surface of the annular projection and an outer peripheral wall of the annular groove are provided with a gap therebetween.

Furthermore, an inner sealing ring is further arranged on the annular boss, and the inner sealing ring is in sealing connection with the bottom surface of the annular groove.

Preferably, the seal gasket further includes a leak detection ring, shaft ends on two sides of the leak detection ring are respectively welded and fixed on the outer peripheral portion of the first ring and the outer peripheral portion of the second ring along the circumferential direction, a closed leak detection chamber is formed among the first ring, the second ring, the stress release ring and the leak detection ring, and the leak detection ring is further connected with a leak detection pipe communicated with the leak detection chamber.

Furthermore, the longitudinal section of the leak detection ring is convex or concave along the radial direction.

Furthermore, a first outer sealing ring is further arranged at the end part of the outer side shaft of the first ring, the first outer sealing ring is located on the radial outer side of the first sealing ring, a first leakage detecting hole penetrating along the axial direction is formed in the first ring, and the first leakage detecting hole is located between the first sealing ring and the first outer sealing ring in the radial direction; the outer shaft end part of the second ring is provided with a second outer sealing ring, the second outer sealing ring is located on the radial outer side of the second sealing ring, a second leakage detecting hole penetrating along the axial direction is formed in the second ring, and the second leakage detecting hole is located between the second sealing ring and the second outer sealing ring in the radial direction.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: when the sealing gasket is used in a sealing device, when the flanges on two sides of the sealing gasket generate radial displacement difference due to different working temperature fields, the first ring and the second ring can be always kept sealed through the deformation of the stress release ring, so that the first sealing ring and the second sealing ring and the contacted sealed surfaces are always kept synchronously moving, the contact is relatively static, the sealing gasket is not abraded, the sealing surfaces cannot rub against each other to damage the sealing rings, and the sealing is kept effective. The sealing gasket is particularly suitable for the high-temperature and high-pressure working condition environment.

Drawings

FIG. 1 is a schematic longitudinal sectional view of a gasket of example 1 of the present invention;

FIG. 2 is a schematic longitudinal cross-sectional view of a seal assembly employing the gasket of FIG. 1, wherein the gasket is not yet compressed;

FIG. 3 is a schematic longitudinal sectional view of the sealing device of FIG. 2 after the gasket is compressed and radially displaced;

FIG. 4 is a longitudinal cross-sectional view of a gasket of example 2 of the present invention;

FIG. 5 is a schematic longitudinal cross-sectional view of a seal assembly employing the gasket of FIG. 4, after compression and without radial displacement;

FIG. 6 is a longitudinal cross-sectional view of a gasket of example 3 of the present invention;

FIG. 7 is a longitudinal cross-sectional view of a gasket of example 4 of the present invention;

FIG. 8 is a schematic longitudinal cross-sectional view of a seal assembly employing the gasket of FIG. 7 after compression and without radial displacement;

FIG. 9 is a longitudinal cross-sectional view of a gasket of example 5 of the present invention;

FIG. 10 is a schematic longitudinal cross-sectional view of a seal assembly employing the gasket of FIG. 9, after compression and without radial displacement of the gasket;

wherein: 100. a first flange; 101. a first flange face; 102. a first mounting groove;

200. a second flange; 201. a second flange face; 202. a second mounting groove;

300. sealing gaskets; 1. a first ring; 11. an annular boss; 12. an annular groove; 13. a first leak detection hole; 14. a first arc-shaped slot; 2. a second ring; 21. an annular groove; 22. a second leak detection hole; 3. a first seal ring; 4. a second seal ring; 5. a stress relief ring; 6. 6', a leakage detecting ring; 7. a drain pipe; 8. an inner seal ring; 9. a first outer sealing ring; 10. a second outer seal ring.

Detailed Description

The technical solution of the present invention is further explained with reference to the drawings and the specific embodiments.

Example 1

Referring to the sealing gasket shown in fig. 1, the sealing gasket includes a first ring 1 and a second ring 2 coaxially stacked, a first sealing ring 3 is disposed at an outer axial end of the first ring 1, a second sealing ring 4 is disposed at an outer axial end of the second ring 2, and the first sealing ring 3 and the second sealing ring 4 may be made of a metal material or a non-metal material, and specifically may be a metal ring, a packing ring, an O-ring, or the like. The sealing gasket is connected with the flange surfaces of the two flanges in a sealing mode through the first sealing ring 3 and the second sealing ring 4. Here, the shaft end portion where the first ring 1 and the second ring 2 are fitted and connected to the flange is referred to as an outer shaft end portion, and the shaft end portion where the first ring 1 and the second ring 2 contact each other is referred to as an inner shaft end portion.

The sealing gasket also comprises a stress release ring 5, the longitudinal section of the stress release ring 5 is in a C shape which is arched outwards along the radial direction, and the peripheral surface of the outer side of the stress release ring is an arc surface. The stress release ring 5 is coaxially disposed with the first ring 1 and the second ring 2, and has the same inner diameter. The inner circumference of the first ring 1 is provided with a first arc-shaped groove 14, the inner circumference of the second ring 2 is provided with a second arc-shaped groove (not marked in the figure), the first arc-shaped groove 14 and the second arc-shaped groove are both semi-circular arc-shaped grooves, and the two grooves are mutually matched to form a containing space for containing the stress release ring 5. Both side shaft ends of the stress release ring 5 are welded and fixed to the first ring 1 and the second ring 2 in the circumferential direction, respectively, so that a gap between the first ring 1 and the second ring 2 is closed by the stress release ring 5 at the inner circumferential portion.

The outer peripheral surface of the stress relief ring 5 is disposed with a gap from the circumferential groove wall of the first arc-shaped groove 14, as shown at a in fig. 1. Preferably, the gap is gradually increased from the outside to the inside in the axial direction of the first ring 1. The outer circumferential surface of the stress release ring 5 and the circumferential groove wall of the second arc-shaped groove are arranged in a mutually attached and contacted manner. Thus, when the second ring 2 is displaced radially outward relative to the first ring 1, the stress release ring 5 deforms, one axial end of the stress release ring 5 abuts against the second arc-shaped groove and can bear higher pressure, the other axial end deforms, and the gap provides a space for the stress release ring 5 to deform and release.

Referring to fig. 1, in the present embodiment, an annular boss 11 is disposed on an inner axial end of the first ring 1, an annular groove 21 is disposed on an inner axial end of the second ring 2, a radial thickness of the annular boss 11 is smaller than a radial width of the annular groove 21, and the annular boss 11 is correspondingly inserted into the annular groove 21, as shown at B in fig. 1, to form a gap between the annular boss 11 and the annular groove 21, so that the annular boss 11 can move in the annular groove 21 when the second ring 2 is displaced outward in the radial direction relative to the first ring 1, that is, a radial deformation compensation space is reserved when the second ring 2 is displaced in the radial direction relative to the first ring 1. When the sealing gasket is arranged, in an unused state, only a gap needs to be ensured between the inner peripheral surface of the annular boss 11 and the inner peripheral wall of the annular groove 21, the gap is not smaller than the radial displacement difference between the second ring 2 and the first ring 1, and the gap value is determined according to multiple factors such as the material adopted by the sealing gasket, the working condition environment of use and the like when the sealing gasket is specifically arranged. In some other embodiments, the annular groove may be formed on the first ring 1, and the annular protrusion may be formed on the second ring 2, wherein a gap is formed between an outer circumferential surface of the annular protrusion and an outer circumferential surface of the annular groove.

In this embodiment, the height of the annular boss 11 is greater than the depth of the annular groove 21, so that a gap is formed between the inner axial end surface of the first ring 1 and the inner axial end surface of the second ring 2.

Referring to fig. 2 and 3, the 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, wherein the first flange 100 is provided with a first mounting groove 102, and the second flange 200 is provided with a second mounting groove 202.

The first flange 100, the second flange 200 and the sealing gasket 300 are coaxially arranged, and the working temperature field of the second flange 200 is higher than that of the first flange 100. The first flange 100 and the second flange 200 are axially pressed and connected through bolts, and the sealing gasket 300 is pressed between the first flange 100 and the second flange 200, wherein the outer axial end of the first ring 1 is fittingly embedded in the first mounting groove 102, the outer axial end of the second ring 2 is fittingly embedded in the second mounting groove 202, the first sealing ring 3 forms a seal with the bottom wall of the first mounting groove 102, and the second sealing ring 4 forms a seal with the bottom wall of the second mounting groove 202.

After the sealing gasket 300 is compressed, the first ring 1 and the second ring 2 are respectively positioned and restrained in the first mounting groove 102 and the second mounting groove 202, the axial outer end faces of the first ring 1 and the second ring 2 are respectively in bearing contact with the flange faces of the two flanges, and the compression amount of the first sealing ring 3 and the second sealing ring 4 is limited, so that the sealing stress of each sealing ring is constant.

In the working state of the sealing device, when the flanges at two sides of the sealing gasket 300 have radial displacement difference due to temperature difference, the first mounting groove 102 and the second mounting groove 202 move asynchronously along the radial direction, the displacement difference between the two grooves is shown as a in fig. 3, and at the moment, the first ring 1 and the second ring 2 can be always kept sealed through the deformation of the stress release ring 5. The first ring 1 located on the low-temperature side is constrained in the first mounting groove 102 and moves radially along with the first flange 100, and the second ring 2 located on the high-temperature side is constrained in the second mounting groove 202 and moves radially along with the second flange 200, so that the first sealing ring 3 and the second sealing ring 4 are always kept in synchronous movement, contact is relatively static and is not worn, the sealing surfaces cannot rub against each other to damage the sealing rings, and sealing is kept effective. The sealing gasket of this embodiment is particularly useful for under the high-temperature high-pressure operating mode environment.

Example 2

Referring to the gasket shown in fig. 4, the difference from the gasket of example 1 is mainly that in this embodiment, the gasket further includes a leak detection ring 6, where the longitudinal section of the leak detection ring 6 is in the shape of an outwardly convex C. The shaft ends at two sides of the leakage detecting ring 6 are respectively welded and fixed on the periphery of the outer side of the first ring 1 and the periphery of the outer side of the second ring 2 along the circumferential direction, a closed leakage detecting cavity is formed among the first ring 1, the second ring 2, the stress releasing ring 5 and the leakage detecting ring 6, and the leakage detecting ring 6 is also fixedly connected with a leakage detecting pipe 7 communicated with the leakage detecting cavity. Therefore, the leakage inspection can be carried out on the welding seam of the stress release ring 5, and the timely alarm can be realized when the welding seam fails. A sealing device using the gasket is shown in fig. 5.

Example 3

Referring to the gasket of fig. 6, the difference from the gasket of example 2 is mainly that in this example, the longitudinal section of the leak detection ring 6' in the gasket is concave C-shaped.

Example 4

Referring to the sealing gasket shown in fig. 7, the difference from the sealing gasket of embodiment 2 is mainly that in this embodiment, an annular groove 12 is further formed on the annular boss 11, an inner sealing ring 8 is disposed in the annular groove 12, and the inner sealing ring 8 is in sealing connection with the groove bottom surface of the annular groove 21. In this way, a second sealing barrier between the first ring 1 and the second ring 2 may be provided in case of failure of the weld at the stress relief ring 5. The sealing device using the gasket is shown in fig. 8.

Example 5

Referring to the seal gasket shown in fig. 9, compared with the seal gasket of embodiment 4, the difference is mainly that in this embodiment, a first outer sealing ring 9 is further disposed on an outer shaft end portion of the first ring 1, the first outer sealing ring 9 is located on a radial outer side of the first sealing ring 3, a first leakage detecting hole 13 penetrating along an axial direction is further formed in the first ring 1, and the first leakage detecting hole 13 is located between the first sealing ring 3 and the first outer sealing ring 9 in the radial direction; the outer shaft end part of the second ring 2 is further provided with a second outer sealing ring 10, the second outer sealing ring 10 is located on the radial outer side of the second sealing ring 4, the second ring 2 is further provided with a second leakage detecting hole 22 penetrating along the axial direction, and the second leakage detecting hole 22 is located between the second sealing ring 4 and the second outer sealing ring 10 in the radial direction. This enables leak detection and monitoring of the overall seal condition. A sealing device using the gasket is shown in fig. 10.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and 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 by: the sealing gasket comprises a first ring and a second ring which are coaxially stacked, a first sealing ring is arranged at the outer side shaft end part of the first ring, a second sealing ring is arranged at the outer side shaft end part of the second ring, the sealing gasket further comprises a stress release ring, the longitudinal section of the stress release ring is in a C shape which is arched outwards along the radial direction, a first arc-shaped groove is formed in the inner side circumference part of the first ring, a second arc-shaped groove is formed in the inner side circumference part of the second ring, the first arc-shaped groove and the second arc-shaped groove are matched with each other to form a containing space for containing the stress release ring, the shaft end parts at two sides of the stress release ring are respectively welded and fixed on the first ring and the second ring along the circumferential direction, and the outer side circumference surface of the stress release ring and the circumferential direction groove wall of the first arc-shaped groove are arranged in a clearance mode.

2. A gasket seal according to claim 1, wherein: the outer side peripheral surface of the stress release ring is contacted with the circumferential groove wall of the second arc-shaped groove.

3. A gasket seal according to claim 1, wherein: the gap between the outer circumferential surface of the stress release ring and the circumferential groove wall of the first arc-shaped groove is gradually increased along the axial direction of the first ring from outside to inside.

4. A gasket seal according to claim 1, wherein: one of the inner shaft end of the first ring and the inner shaft end of the second ring is provided with an annular boss, the other one of the inner shaft end of the first ring and the inner shaft end of the second ring is provided with an annular groove, the radial thickness of the annular boss is smaller than the radial width of the annular groove, and the annular boss is correspondingly inserted into the annular groove.

5. A gasket seal according to claim 4, wherein: the annular boss is arranged on the first ring, the annular groove is arranged on the second ring, and a gap is formed between the inner peripheral surface of the annular boss and the inner peripheral wall of the annular groove.

6. A gasket seal according to claim 5, wherein: the annular groove is arranged on the first ring, the annular boss is arranged on the second ring, and a gap is formed between the outer peripheral surface of the annular boss and the outer peripheral wall of the annular groove.

7. A gasket seal according to claim 4, wherein: the annular boss is further provided with an inner sealing ring, and the inner sealing ring is connected with the bottom surface of the annular groove in a sealing mode.

8. The sealing gasket according to any of claims 1 to 7, wherein: the sealing gasket further comprises a leakage detecting ring, shaft end parts on two sides of the leakage detecting ring are respectively welded and fixed on the periphery of the outer side of the first ring and the periphery of the outer side of the second ring along the circumferential direction, a closed leakage detecting cavity is formed among the first ring, the second ring, the stress releasing ring and the leakage detecting ring, and the leakage detecting ring is further connected with a leakage detecting pipe communicated with the leakage detecting cavity.

9. The gasket seal of claim 8, wherein: the longitudinal section of the leak detection ring is in an outward convex shape or an inward concave shape along the radial direction.

10. The gasket seal of claim 8, wherein: a first outer sealing ring is further arranged at the end part of the outer side shaft of the first ring, the first outer sealing ring is located on the radial outer side of the first sealing ring, a first leakage detecting hole penetrating along the axial direction is formed in the first ring, and the first leakage detecting hole is located between the first sealing ring and the first outer sealing ring in the radial direction;

the outer shaft end part of the second ring is provided with a second outer sealing ring, the second outer sealing ring is located on the radial outer side of the second sealing ring, a second leakage detecting hole penetrating along the axial direction is formed in the second ring, and the second leakage detecting hole is located between the second sealing ring and the second outer sealing ring in the radial direction.