CN210800037U - Self-sealing alloy double-corrugation sealing composite gasket - Google Patents
Self-sealing alloy double-corrugation sealing composite gasket Download PDFInfo
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- CN210800037U CN210800037U CN201920952804.XU CN201920952804U CN210800037U CN 210800037 U CN210800037 U CN 210800037U CN 201920952804 U CN201920952804 U CN 201920952804U CN 210800037 U CN210800037 U CN 210800037U
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Abstract
The utility model discloses a self-sealing formula alloy dual ripple seals composite pad piece, first metal ripple ring piece including upper and lower coaxial superpose, spacing metal ripple ring piece and second metal ripple ring piece, spacing metal ripple ring piece includes the ring piece body, the outer edge of ring piece body is equipped with flange and lower flange, the surface of ring piece body is equipped with the slot through ring piece body center, the outside limit of first metal ripple ring piece and the inner wall contact of upper flange, the outside limit of second metal ripple ring piece and the inner wall contact of lower flange, the upper flange height is less than the ripple amplitude value of first metal ripple ring piece, the lower flange height is less than the ripple amplitude value of second metal ripple ring piece, the upside of first metal ripple ring piece and the downside of second metal ripple ring piece are equipped with surface covering layer. In this way, self-sealing formula alloy dual ripple sealing composite gasket, the structure is succinct, has solved the problem that medium pressure risees and leads to seal gasket sealing performance to descend.
Description
Technical Field
The utility model relates to a flange seal gasket especially relates to a self-sealing formula alloy dual ripple seals composite gasket.
Background
In industrial process equipment such as pipelines, pressure vessels, heat exchangers and the like, sealing gaskets are visible everywhere. The sealing gasket is used, so that the sealing performance of the equipment can be kept, and the abrasion problem of the connecting piece can be solved. With the progress of science and technology, process industrial devices become parameterized and large-sized, new processes are continuously generated, particularly the rise of petrochemical industry, chemical industry and large-scale power stations, process equipment develops towards high temperature, high pressure, high vacuum, deep cooling and large-scale, and the requirements on gaskets are more and more strict. As a result, some conventional sealing materials and structures have been unable to meet the increasingly stringent sealing requirements for systems and equipment.
At present, the common industrial composite sealing gaskets mainly comprise metal wound gaskets, metal tooth-shaped composite gaskets, metal coated gaskets and the like. The sealing principle of the flange is extremely simple: the two sealing surfaces of the bolt press the flange gasket against each other and form a seal, but this also leads to a break in the seal. In order to keep good sealing performance, the gasket can be used for making up microscopic irregularities on a flange connecting surface, but leakage problems still occur, such as cracking, deterioration and corrosion of the gasket caused by gasket materials, and the like, and the flange gasket has extremely high requirements on the compression resilience performance and material characteristics because the pre-tightening force is insufficient due to the fact that a long-time working bolt can be subjected to extension deformation.
In the existing flange connection, corresponding axial force can be formed after medium pressure enters equipment, and the axial force can change bolt force and gasket stress in the flange connection. The bolt force can be increased along with the increase of the internal pressure, and the stress of the sealing gasket is reduced along with the increase of the internal pressure, so that the sealing performance of the sealing gasket can be reduced to a certain extent along with the height of the medium pressure, and improvement is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a self-sealing formula alloy dual ripple seals composite gasket, the medium pressure risees and leads to seal gasket stress to reduce and influence sealing performance's problem among the solution current flange sealing technique.
The technical scheme of the utility model is like this: a self-sealing alloy dual-corrugation seal composite gasket, comprising: a first metal corrugated ring sheet, a limiting metal ring sheet and a second metal corrugated ring sheet which are coaxially superposed up and down, the limiting metal ring sheet comprises a ring sheet body, the outer circle edge of the ring sheet body is provided with an upper flange and a lower flange, the upper surface and the lower surface of the ring body are respectively provided with a groove passing through the center of the ring body, the first metal corrugated ring sheet is contacted with the upper surface of the ring sheet body, the second metal corrugated ring sheet is contacted with the lower surface of the ring sheet body, the outer side edge of the first metal corrugated ring sheet is contacted with the inner wall of the upper flange, the outer side edge of the second metal corrugated ring sheet is contacted with the inner wall of the lower flange, said upper flange height being less than a corrugation amplitude value of said first metal corrugated rim sheet, said lower flange height being less than a corrugation amplitude value of said second metal corrugated rim sheet, and surface covering layers are arranged on the upper side of the first metal corrugated ring sheet and the lower side of the second metal corrugated ring sheet.
Preferably, the groove is a straight groove and is arranged along the radial direction of the ring plate body.
Preferably, the two grooves on the upper surface and the lower surface of the ring body are respectively distributed in a vertically crossed manner.
Preferably, the wave crests of the cross-sectional wave form of the first metal corrugated ring sheet are opposite to the wave troughs of the cross-sectional wave form of the second metal corrugated ring sheet, and the wave troughs of the cross-sectional wave form of the first metal corrugated ring sheet are opposite to the wave crests of the cross-sectional wave form of the second metal corrugated ring sheet.
Preferably, the surface covering layer is a flexible graphite layer or a polytetrafluoroethylene layer, and other covering layer materials can also be adopted.
Preferably, the first metal corrugated ring sheet and the second metal corrugated ring sheet are nickel-titanium alloy corrugated ring sheets, and other alloy materials can also be adopted.
Preferably, the limiting metal ring sheet is made of carbon steel or stainless steel.
Preferably, the nominal diameter corrugation number of the first metal corrugated ring sheet and the second metal corrugated ring sheet is 4-6, and the corrugation amplitude value is 0.3-0.5 mm.
Preferably, the thickness of the first metal corrugated ring sheet and the second metal corrugated ring sheet is 0.3-0.5 mm.
Preferably, the ring piece body, the upper flange and the lower flange are of an integrated structure with an H-shaped section.
The utility model discloses a theory of operation is:
a self-sealing alloy double-corrugation sealing composite gasket (hereinafter, referred to as a composite gasket) is placed between two connected flanges, the composite gasket is pressed tightly by screwing a connecting bolt when the flanges are pre-tightened, corresponding pressing force, namely gasket stress, is formed on the surface of the composite gasket, and the flange connection part can be sealed when the gasket stress reaches a certain value. In the operating state, although the stress is the same as that of the existing flange connection, for example, after the medium pressure enters the equipment, the corresponding axial force is generated, the axial force can change the bolt force and the gasket stress in the flange connection, wherein the bolt force increases with the increase of the internal pressure, the gasket stress decreases with the increase of the internal pressure, but at the same time, the medium pressure can penetrate into the gaps between the first metal corrugated ring sheet, the second metal corrugated ring sheet and the limiting metal ring sheet through the grooves of the limiting metal ring sheet, the pressure entering the gaps acts on the inner sides of the first metal corrugated ring sheet and the second metal corrugated ring sheet, so that the first metal corrugated ring sheet and the second metal corrugated ring sheet are respectively pressed outwards to the corresponding flange surfaces, thereby creating additional gasket stress between the outer surface of the composite gasket and the flange face, which additional gasket stress can reach the media pressure.
The sealing performance of the gasket is better than that of other conventional gaskets because the existence of the additional gasket stress compensates the gasket stress reduced by the increase of the medium pressure or other reasons. The additional gasket stress is created by the pressure of the medium in the device or piping, the higher the pressure of the medium, the greater the additional gasket stress, and the seal is easily ensured.
The utility model provides a technical scheme's beneficial effect is: through the design of slot, the guide medium gets into first metal ripple ring piece, the gap of second metal ripple ring piece and spacing metal ring piece, reduce the gasket stress that arouses because of medium pressure and compensated, pressure self sealss characteristic has, medium pressure in the system is higher, its sealing performance is better, thereby overcome current gasket and arouse the not enough of sealing performance reduction because of the medium pressure in the system risees, the design of first metal ripple ring piece and second metal ripple ring piece symmetry has better ground pressure and withdraws elastic energy, further guarantee sealing performance, overall structure is succinct, easily manufacturing.
Drawings
Fig. 1 is a schematic structural view of the self-sealing alloy dual-corrugation sealing composite gasket of the present invention.
Fig. 2 is a schematic top view of the metal ring sheet of fig. 1.
Fig. 3 is a schematic sectional view taken along line a-a of fig. 2.
FIG. 4 is a schematic structural diagram of a comparative example.
Detailed Description
The present invention will be further described with reference to the following examples, which should not be construed as limiting the invention.
Example (b):
referring to fig. 1 to 3, the present embodiment relates to a self-sealing alloy dual-corrugation sealing composite gasket, which includes: the first metal corrugated ring sheet 1, the limiting metal ring sheet 2 and the second metal corrugated ring sheet 3 are coaxially overlapped up and down, the first metal corrugated ring sheet 1, the limiting metal ring sheet 2 and the second metal corrugated ring sheet 3 are all provided with a central through hole to be annular, and the central through hole is beneficial to the passing of fluid.
Spacing metal ring piece 2 is made for carbon steel or stainless steel, and its structure includes the ring piece body, and the excircle edge of ring piece body is equipped with respectively and protrudes in the upper flange 2a of upper surface and protrudes in the lower flange 2b of lower surface, and ring piece body, upper flange 2a and lower flange 2b are the integrated structure of cross-section for the H shape, the sound construction.
The upper surface and the lower surface of the ring piece body are respectively provided with a groove 2c passing through the center of the ring piece body, the grooves 2c are linear grooves and are arranged along the radial direction of the ring piece body, and the grooves 2c on the upper surface and the lower surface of the ring piece body are respectively two and are distributed in a vertical cross mode.
The first metal corrugated ring plate 1 and the second metal corrugated ring plate 3 are all sine-wave in cross section, all made of nickel-titanium alloy, the first metal corrugated ring plate 1 is in contact with the upper surface of the ring plate body, the outer side edge of the first metal corrugated ring plate 1 is in contact with the inner wall of the upper flange 2a, and namely the first metal corrugated ring plate 1 is embedded in the upper surface of the ring plate body. Similarly, the second metal corrugated ring plate 3 is in contact with the lower surface of the ring plate body, and the outer side edge of the second metal corrugated ring plate 3 is in contact with the inner wall of the lower flange 2b, so that the layers are sealed.
The height of the upper flange 2a is smaller than the ripple amplitude value H of the first metal ripple ring sheet 1, and the height of the lower flange 2b is also smaller than the ripple amplitude value of the second metal ripple ring sheet 3, so that gasket stress is generated when the first metal ripple ring sheet 1 and the second metal ripple ring sheet 3 are pressed.
The upper side of the first corrugated metal ring sheet 1 and the lower side of the second corrugated metal ring sheet 3 are provided with a surface covering layer 4. The surface covering layer 4 can be a flexible graphite layer, a polytetrafluoroethylene layer or other materials, and when the flexible graphite layer and the polytetrafluoroethylene layer are adopted as the surface covering layer 4, the surfaces of the flexible graphite layer and the polytetrafluoroethylene layer, which are in contact with the first metal corrugated ring sheet 1 and the second metal corrugated ring sheet 3, can be arranged into a wave shape to match with the structures of the first metal corrugated ring sheet 1 and the second metal corrugated ring sheet 3, so that the sealing performance is ensured.
The first metal corrugated ring sheet 1 and the second metal corrugated ring sheet 3 are symmetrically arranged above and below the limiting metal ring sheet 2, namely, the wave crest of the section waveform of the first metal corrugated ring sheet 1 is opposite to the wave trough of the section waveform of the second metal corrugated ring sheet 3, and the wave trough of the section waveform of the first metal corrugated ring sheet 1 is opposite to the wave crest of the section waveform of the second metal corrugated ring sheet 3. The nominal diameter corrugation number of the first metal corrugated ring sheet 1 and the second metal corrugated ring sheet 3 is 4-6, 5 are selected in the embodiment shown in fig. 1, the corrugation amplitude value H is 0.3-0.5 mm, the corrugation amplitude value H is 0.4mm in the embodiment shown in fig. 1, the thickness t of the first metal corrugated ring sheet 1 and the second metal corrugated ring sheet 3 is 0.3-0.5 mm, and the thickness t is 0.3mm in the embodiment.
In the comparative example of fig. 4, the sealing gasket structure in the prior art is adopted, the wave crest of the double-layer metal framework 100 is opposite to the wave crest, the wave trough is opposite to the wave trough, the thickness of each layer of the double-layer metal framework 100 is 0.3mm, and the double-layer metal framework is made of stainless steel. The thickness of the graphite filling layer 101 between the double-layer metal framework 100 is 0.1mm, the graphite cladding layer 102 is arranged outside the double-layer metal framework 101, and the thickness of the thinnest part of the graphite cladding layer is 0.1 mm.
Simulation analysis on the resilience performance of the gaskets of the embodiment and the comparative example through ANSYS software shows that the resilience rate of the gasket of the embodiment reaches 55.73% under the action of 60MPa pressure, which is much higher than that of the gasket of the comparative example, and the following table shows details:
| total load/MPa | Examples rebound resilience | Comparative example rebound resilience |
| 60 | 55.73% | 18.39% |
The use condition of the gasket in the flange is simulated by ANSYS software, the load is 60MPa, the medium pressure is 10MPa, the average compressive stress of the limiting metal ring sheet 2 (with the groove structure) and the first metal corrugated ring sheet 1 is 64 MPa, and the average compressive stress of the limiting metal ring sheet (without the groove structure) and the first metal corrugated ring sheet is 57 MPa, so that the gasket has self-sealing performance.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all of which utilize the equivalent structure or equivalent flow transformation made by the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, all included in the same way in the patent protection scope of the present invention.
Claims (9)
1. A self-sealing alloy dual-corrugation seal composite gasket, comprising: the metal corrugated plate comprises a first metal corrugated ring plate, a limiting metal ring plate and a second metal corrugated ring plate which are coaxially overlapped up and down, wherein the limiting metal ring plate comprises a ring plate body, an upper flange and a lower flange are arranged on the outer circle edge of the ring plate body, grooves which pass through the center of the ring plate body are respectively arranged on the upper surface and the lower surface of the ring plate body, the first metal corrugated ring plate is in contact with the upper surface of the ring plate body, the second metal corrugated ring plate is in contact with the lower surface of the ring plate body, the outer side edge of the first metal corrugated ring plate is in contact with the inner wall of the upper flange, the outer side edge of the second metal corrugated ring plate is in contact with the inner wall of the lower flange, the height of the upper flange is smaller than the corrugated amplitude value of the first metal corrugated ring plate, the height of the lower flange is smaller than the corrugated amplitude value of the second metal corrugated ring plate, and surface covering layers are arranged on the upper side of the first metal corrugated ring plate and the lower side of the second metal, the grooves are linear grooves and are arranged along the radial direction of the ring piece body.
2. The self-sealing alloy dual corrugation seal composite gasket of claim 1 wherein the grooves on the upper and lower surfaces of the ring plate body are two and vertically cross each other.
3. The self-sealing alloy dual corrugation seal composite gasket of claim 1 wherein peaks of the cross-sectional corrugation of the first metal corrugated ring sheet are opposite to valleys of the cross-sectional corrugation of the second metal corrugated ring sheet, and the valleys of the cross-sectional corrugation of the first metal corrugated ring sheet are opposite to peaks of the cross-sectional corrugation of the second metal corrugated ring sheet.
4. The self-sealing alloy dual corrugation seal composite shim of claim 1 wherein the surface overlay is a flexible graphite layer or a polytetrafluoroethylene layer.
5. The self-sealing alloy dual corrugation seal composite gasket of claim 1 wherein the first and second metal corrugated ring segments are nitinol corrugated ring segments.
6. The self-sealing alloy dual corrugation seal composite shim of claim 1 wherein the retaining metal ring tabs are carbon steel or stainless steel retaining metal ring tabs.
7. The self-sealing alloy dual corrugation seal composite gasket of claim 1 wherein the first and second metal corrugated ring sheets have a nominal diameter corrugation number of 4 to 6 and a corrugation amplitude value of 0.3 to 0.5 mm.
8. The self-sealing alloy dual corrugation seal composite gasket of claim 1 wherein the first and second metal corrugated ring sheets have a thickness of 0.3 to 0.5 mm.
9. The self-sealing alloy dual corrugation seal composite shim of claim 1 wherein the ring plate body, upper flange and lower flange are of an integral construction having an H-shaped cross-section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920952804.XU CN210800037U (en) | 2019-06-24 | 2019-06-24 | Self-sealing alloy double-corrugation sealing composite gasket |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920952804.XU CN210800037U (en) | 2019-06-24 | 2019-06-24 | Self-sealing alloy double-corrugation sealing composite gasket |
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| CN210800037U true CN210800037U (en) | 2020-06-19 |
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| CN201920952804.XU Active CN210800037U (en) | 2019-06-24 | 2019-06-24 | Self-sealing alloy double-corrugation sealing composite gasket |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185798A (en) * | 2019-06-24 | 2019-08-30 | 江苏省特种设备安全监督检验研究院 | A kind of self-sealed alloy double bellow seal Composition spacer |
| CN116816932A (en) * | 2023-06-07 | 2023-09-29 | 广东粤凯科技装备制造有限公司 | Multi-dimensional reinforced sandwich type composite sealing gasket |
-
2019
- 2019-06-24 CN CN201920952804.XU patent/CN210800037U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185798A (en) * | 2019-06-24 | 2019-08-30 | 江苏省特种设备安全监督检验研究院 | A kind of self-sealed alloy double bellow seal Composition spacer |
| CN110185798B (en) * | 2019-06-24 | 2024-02-27 | 江苏省特种设备安全监督检验研究院 | Self-sealing alloy dual-corrugated sealing composite gasket |
| CN116816932A (en) * | 2023-06-07 | 2023-09-29 | 广东粤凯科技装备制造有限公司 | Multi-dimensional reinforced sandwich type composite sealing gasket |
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