CN214789283U - High-pressure ultralow-leakage valve rod combined sealing structure - Google Patents
High-pressure ultralow-leakage valve rod combined sealing structure Download PDFInfo
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- CN214789283U CN214789283U CN202023292728.6U CN202023292728U CN214789283U CN 214789283 U CN214789283 U CN 214789283U CN 202023292728 U CN202023292728 U CN 202023292728U CN 214789283 U CN214789283 U CN 214789283U
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- gland
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- sealing ring
- sealing
- ring
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- 238000007789 sealing Methods 0.000 title claims abstract description 91
- 210000004907 gland Anatomy 0.000 claims abstract description 50
- 238000003825 pressing Methods 0.000 claims abstract description 36
- 239000000428 dust Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 5
- 239000004519 grease Substances 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000012855 volatile organic compound Substances 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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- Sealing Devices (AREA)
Abstract
A high-pressure ultralow-leakage valve rod combined sealing structure comprises a valve body, a gland and a valve rod, wherein the gland is arranged on the valve body, the valve rod extends into the valve body through the gland, pressing devices are arranged on two sides of the gland, a pressing sleeve is arranged on the upper portion between the gland and the valve rod, a dustproof ring is arranged in the pressing sleeve, a combined sealing ring is arranged between the gland and the valve rod and below the pressing sleeve, an O-shaped sealing ring is arranged in the middle between the gland and the valve rod, a shaft sleeve is arranged below the gland, a lip-shaped sealing ring is arranged on the lower portion between the gland and the valve rod, an L-shaped check ring is arranged below the lip-shaped check ring, a thrust gasket is arranged below the L-shaped check ring, a grease injector is arranged on the left side of the gland, multiple sealing structures can bear internal and external pressures at the same time, good sealing can be ensured even under the high-temperature working condition of fire, the anti-corrosion performance is better improved, and the service life of the sealing ring is prolonged, the valve rod sealing problem of the ball valve with the ultra-low leakage requirement at high pressure is safely and reliably solved.
Description
Technical Field
The utility model relates to a seal structure, in particular to ultralow leakage valve rod composite seal structure of high pressure.
Background
In recent years, Volatile Organic Compounds (VOCs) emission control has become one of the major efforts in environmental governance. Most materials and media belong to volatile organic compounds in the production process of petrochemical enterprises, and static seal and dynamic seal assemblies such as numerous valves, flanges and pumps are involved in process equipment, so that the leakage discharge of a large amount of VOCs can be inevitably generated in the production and operation processes, and the petrochemical industry becomes one of main discharge sources of atmospheric VOCs. Petrochemical enterprises are also increasing the emission control of VOCs in order to reduce environmental pollution and processing loss. According to statistics, equipment component leakage (i.e. unorganized emission) accounts for about 70% of petrochemical VOCs emission, is a main VOCs emission source, and solves the problem that equipment component leakage becomes the important factor in controlling VOCs emission in the petrochemical industry. In the causes of leakage of the equipment assembly, besides the causes of inadequate maintenance, manual operation or improper installation of the sealing assembly, failure of the sealing structure of the equipment is also the most important cause, which mainly shows that the sealing ring and the packing structure are unreasonable in design, the type selection grade of the sealing material is insufficient, and the sealing structure is the root cause for realizing zero leakage of the equipment assembly.
The existing conventional ball valve rod is mainly sealed by an O-shaped sealing ring and graphite packing, and the sealing structure is simple and widely applied to the fields of petroleum, natural gas and chemical industry. How to achieve ultralow leakage at the valve rod sealing position with volatile organic compounds and toxic media under the working conditions of high pressure and fire becomes a new challenge.
Disclosure of Invention
For solving the technical problem, the utility model provides a ultralow leakage valve rod combined seal structure of high pressure, including valve body, gland and valve rod, the gland sets up on the valve body, the valve rod stretches into in the valve body through the gland, the gland both sides are equipped with closing device, upper portion is equipped with the pressure cover between gland and the valve rod, be equipped with the dust ring in the pressure cover, between gland and the valve rod and the pressure cover below be equipped with combined seal circle, the middle part is equipped with O type sealing washer between gland and the valve rod, the gland below is equipped with the axle sleeve, the lower part is equipped with lip seal between gland and the valve rod, lip seal below is equipped with L type retaining ring, L type retaining ring below is equipped with thrust washer, the gland left side is equipped with the notes fat ware.
Furthermore, the pressing device is fixed on the pressing cover through a stud, a nut is arranged above the stud, a guide sleeve and a pressing plate are arranged in the middle of the stud, a disc spring assembly is arranged between the guide sleeve and the pressing plate, and the bottom of the inner side of the pressing plate is pressed on the top of the pressing sleeve.
Further, the combined sealing ring is formed by connecting a rectangular woven sealing ring, a rectangular sealing ring, a concave sealing ring, a convex sealing ring and a metal backing ring in a sealing manner from top to bottom, wherein the bottom of the concave sealing ring is designed to be a concave triangle, and the top of the convex sealing ring is designed to be a convex triangle.
The utility model has the advantages that: a quintuple seal combined structure is adopted among the valve rod, the valve body and the gland, the first primary seal is a lip-shaped seal ring structure, is arranged between the valve rod and the valve cover and is positioned by an L-shaped check ring; the second seal and the third seal are O-shaped seal rings and are arranged in a gland groove, the fourth seal is a combined seal ring and is assembled in a gland open groove, and the combined seal ring is pressed by a pressing device consisting of a pressing plate, a pressing sleeve, a disc spring assembly and the like, so that good seal can be ensured even under the high-temperature working condition of fire; the fifth sealing ring is embedded in the pressing sleeve and mainly plays roles in preventing dust and intrusion of external media; the multiple sealing structure can bear the internal pressure and the external pressure simultaneously, the grease injector is arranged in the gland, the second O-shaped sealing ring and the third O-shaped sealing ring can be lubricated and maintained, the corrosion resistance and the service life of the sealing rings are improved, and the valve rod sealing problem of the ball valve with the ultralow leakage requirement under high pressure is safely and reliably solved.
Drawings
FIG. 1 is a schematic structural diagram of a high-pressure ultra-low leakage valve rod combined sealing structure;
fig. 2 is a schematic structural diagram of the combined sealing ring.
Labeled as: 1. a valve body; 2. A gland; 3. a valve stem; 4. a pressing device; 5. pressing the sleeve; 6. a dust ring; 7. a combined sealing ring; 8. an O-shaped sealing ring; 9. a lip-shaped seal ring; 10. an L-shaped retainer ring; 11. a thrust washer; 12. a stud; 13. a nut; 14. a guide sleeve; 15. pressing a plate; 16. a disc spring assembly; 17. a grease injector; 18. a shaft sleeve; 101. a metal backing ring; 102. a male seal ring; 103. a concave sealing ring; 104. a rectangular sealing ring; 105. the sealing washer is woven to the rectangle.
Detailed Description
In order to deepen the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and embodiments, which are only used for explaining the present invention and are not limited to the protection scope of the present invention.
Examples
The utility model provides a high pressure ultralow leakage valve rod combined seal structure, includes valve body 1, gland 2 and valve rod 3, gland 2 sets up on valve body 1, valve rod 3 stretches into in the valve body 1 through gland 2, 2 both sides of gland are equipped with closing device 4, upper portion is equipped with pressure cover 5 between gland 2 and the valve rod 3, be equipped with dust ring 6 in the pressure cover 5, between gland 2 and the valve rod 3 and pressure cover 5 below are equipped with combined seal circle 7, the middle part is equipped with O type sealing washer 8 between gland 2 and the valve rod 3, 2 below of gland is equipped with axle sleeve 18, the lower part is equipped with lip seal 9 between gland 2 and the valve rod 3, lip seal 9 below is equipped with L type retaining ring 10, L type retaining ring 10 below is equipped with thrust washer 11, 2 left sides of gland are equipped with notes fat ware 17.
Further, the pressing device 4 is fixed on the gland 2 through a stud 12, a nut 13 is arranged above the stud 12, a guide sleeve 14 and a pressing plate 15 are arranged in the middle of the stud 12, a disc spring assembly 16 is arranged between the guide sleeve 14 and the pressing plate 15, and the bottom of the inner side of the pressing plate 15 is pressed on the top of the pressing sleeve 5.
Further, the combined sealing ring 7 is formed by hermetically connecting a rectangular woven sealing ring 105, a rectangular sealing ring 104, a concave sealing ring 103, a convex sealing ring 102 and a metal backing ring 101 from top to bottom, wherein the bottom of the concave sealing ring 103 is designed into a concave triangle, and the top of the convex sealing ring 102 is designed into a convex triangle.
The working principle is as follows: the gland 2 is arranged above the valve body 1, the lower part of the gland 2 is provided with a shaft sleeve 18, the valve rod 3 extends into the valve body 1 through the shaft sleeve 18 on the gland 2, the whole sealing structure totally comprises five sealing rings, the first sealing ring is a lip-shaped sealing ring 9, a thrust gasket 11 prevents the L-shaped check ring 10 from being worn, the lip-shaped sealing ring 9 is extruded through the L-shaped check ring 10 and is fixed between the gland 2 and the valve rod 1, reliable sealing can be realized under the internal pressure effect, the second sealing ring and the third sealing ring are O-shaped sealing rings 8, the O-shaped sealing rings 8 can simultaneously block the pressure in the inner direction and the outer direction through certain stretching amount and compression amount, the fourth sealing ring is a combined sealing ring 7, the combined sealing ring 7 consists of a metal backing ring 101, a convex sealing ring 102, a concave sealing ring 103, a rectangular sealing ring 104 and a rectangular woven sealing ring 105, the bottom of the concave sealing ring 103 is designed in a concave triangle shape, the top of the convex sealing ring 102 is designed to be convex triangle, the two sealing rings are mutually matched to ensure better sealing effect, the whole combined sealing ring mainly blocks the pressure from the inside of the valve cavity, the nut 13 is screwed downwards on the stud 12, the guide sleeve 14 is enabled to extrude the disc spring assembly 16, the disc spring assembly 16 is compressed and then releases the elasticity to further extrude the pressing plate 15 downwards, the whole pressing device 4 is enabled to extrude the pressing sleeve 5 downwards, the pressing sleeve 5 is enabled to press the combined sealing ring 7 between the pressing cover 2 and the valve rod 3, when the pressure of the valve cavity enters the sealing position of the valve rod 3, the valve body 1 and the pressing cover 2, when the first, the second and the third seals are damaged under fire, the combined sealing ring 7 can still realize reliable sealing under the combined action of the inner pressure and the pressing device 4, the fifth sealing ring is the dust-proof ring 6 arranged in the pressing sleeve 5, the external atmospheric dust can be effectively blocked, the grease injector 17 can inject grease for the two O-shaped sealing rings 8 for lubrication, the corrosion resistance is improved, the service life of the sealing ring is prolonged, the quintuple sealing can bear high pressure from a valve cavity medium and can also block external atmospheric dust, the combined sealing ring 7 keeps reliable sealing under the condition of fire and high temperature, and the problem of ultralow leakage when the valve rod bears high pressure under various working conditions is effectively solved.
The above-mentioned embodiments should not limit the present invention in any way, and all the technical solutions obtained by adopting equivalent replacement or equivalent conversion fall within the protection scope of the present invention.
Claims (3)
1. The utility model provides a high pressure ultra-low leakage valve rod combined seal structure, includes valve body (1), gland (2) and valve rod (3), gland (2) set up on valve body (1), valve rod (3) stretch into in valve body (1) through gland (2), its characterized in that: gland (2) both sides are equipped with closing device (4), upper portion is equipped with pressure cover (5) between gland (2) and valve rod (3), be equipped with dust ring (6) in pressure cover (5), between gland (2) and valve rod (3) and pressure cover (5) below is equipped with combination sealing washer (7), the middle part is equipped with O type sealing washer (8) between gland (2) and valve rod (3), gland (2) below is equipped with axle sleeve (18), the lower part is equipped with lip seal (9) between gland (2) and valve rod (3), lip seal (9) below is equipped with L type retaining ring (10), L type retaining ring (10) below is equipped with thrust washer (11), gland (2) left side is equipped with notes fat ware (17).
2. The high-pressure ultra-low leakage valve rod combined sealing structure of claim 1, wherein: the pressing device (4) is fixed on the pressing cover (2) through a stud (12), a nut (13) is arranged above the stud (12), a guide sleeve (14) and a pressing plate (15) are arranged in the middle of the stud (12), a disc spring assembly (16) is arranged between the guide sleeve (14) and the pressing plate (15), and the bottom of the inner side of the pressing plate (15) is pressed on the top of the pressing sleeve (5).
3. The high-pressure ultra-low leakage valve rod combined sealing structure of claim 2, wherein: the combined sealing ring (7) is formed by connecting a rectangular woven sealing ring (105), a rectangular sealing ring (104), a concave sealing ring (103), a convex sealing ring (102) and a metal backing ring (101) in a sealing manner from top to bottom, the bottom of the concave sealing ring (103) is designed into a concave triangle, and the top of the convex sealing ring (102) is designed into a convex triangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023292728.6U CN214789283U (en) | 2020-12-30 | 2020-12-30 | High-pressure ultralow-leakage valve rod combined sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023292728.6U CN214789283U (en) | 2020-12-30 | 2020-12-30 | High-pressure ultralow-leakage valve rod combined sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214789283U true CN214789283U (en) | 2021-11-19 |
Family
ID=78742816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023292728.6U Active CN214789283U (en) | 2020-12-30 | 2020-12-30 | High-pressure ultralow-leakage valve rod combined sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214789283U (en) |
-
2020
- 2020-12-30 CN CN202023292728.6U patent/CN214789283U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 215000 No.42, Guijia lane, Suzhou Industrial Park, Suzhou City, Jiangsu Province Patentee after: Harbin Electric Suzhou Dauson Valve Co.,Ltd. Country or region after: China Address before: No.42, Guijia lane, Suzhou Industrial Park, Suzhou City, Jiangsu Province, 215026 Patentee before: SUZHOU DOUSON VALVE CO.,LTD. Country or region before: China |
|
| CP03 | Change of name, title or address |