CN110375080B - Pressure self-sealing leak-proof gate valve structure - Google Patents
Pressure self-sealing leak-proof gate valve structure Download PDFInfo
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- CN110375080B CN110375080B CN201910675772.8A CN201910675772A CN110375080B CN 110375080 B CN110375080 B CN 110375080B CN 201910675772 A CN201910675772 A CN 201910675772A CN 110375080 B CN110375080 B CN 110375080B
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- valve
- valve seat
- valve body
- seat
- sliding sleeve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/0227—Packings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
Abstract
The invention discloses a pressure self-sealing leakage-stopping gate valve structure, which comprises a valve body, wherein a valve cavity is arranged in the middle of the valve body, a rear valve seat and a front valve seat are sequentially arranged at two ends of the valve cavity of the valve body from inside to outside, and a sliding sleeve is arranged between the rear valve seat and the front valve seat; an upper flange and a lower flange are fixedly arranged at the upper end and the lower end of the valve body respectively, an upper sheath is fixedly arranged above the upper flange, and a lower sheath is fixedly arranged below the lower flange; the valve body is arranged in the valve cavity and is provided with a flashboard. The inlet and the outlet of the valve body are both of a double-valve-seat structure, a sliding sleeve is arranged between the front valve seat and the rear valve seat, and the pressure self-tightening is realized through the pressure difference between the front valve seat and the rear valve seat and between the valve body, the sliding sleeve and the flashboard when the valve body works, so that the purposes of preventing internal leakage and ensuring sealing are achieved; and adopt balanced sliding sleeve structure, easy dismounting makes maintenance work more swift.
Description
Technical Field
The invention relates to the technical field of natural gas drilling and production devices, in particular to a pressure self-sealing leak-stopping gate valve structure.
Background
At present, the shale gas development in China realizes important strategic breakthrough and enters a large-scale commercial development stage in advance. With the great progress made in the fields of shale gas resource evaluation, process technology systems, equipment research and development and manufacture and the like in China, the method shows that the long horizontal well staged fracturing technology is completely mastered in China, a series of autonomous core technologies for shale gas exploration and development are preliminarily formed, and important breakthroughs are made in the aspects of resource evaluation systems, process technology systems, fracturing equipment research and development and manufacture and the like. However, the core technology of shale gas development in China does not form a system, for example, the key technology of unconventional natural gas exploration and development such as an underbalanced drilling technology, a controlled pressure drilling technology, a rotary steering drilling technology, multistage fracturing, clean water fracturing, synchronous fracturing, hydraulic jet fracturing and repeated fracturing is lacked, and the problems that the valve function of a wellhead device valve is lost due to sand entering of a valve cavity after sealing failure or fracturing is finished are solved, so that the safety risk of the wellhead is greatly increased.
Disclosure of Invention
The invention aims to provide a pressure self-sealing leak-stopping gate valve structure which solves the problems that sealing failure of a well head valve adopted by a natural gas drill at the present stage easily occurs, so that the function of the valve is lost, and the safety risk of the well head is greatly increased.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a pressure self-sealing leakage-stopping gate valve structure which comprises a valve body, wherein a valve cavity is arranged in the middle of the valve body, a rear valve seat and a front valve seat are sequentially arranged at two ends of the valve cavity from inside to outside of the valve body, and a sliding sleeve is arranged between the rear valve seat and the front valve seat; an upper flange and a lower flange are fixedly arranged at the upper end and the lower end of the valve body respectively, an upper sheath is fixedly arranged above the upper flange, and a lower sheath is fixedly arranged below the lower flange; the valve body is in be provided with the flashboard in the valve pocket, the through-hole that is used for supplying the fluid to pass through when the valve is opened is offered to the first half of flashboard, the upper and lower both ends of flashboard respectively with last valve stem and lower valve rod fixed connection, go up the valve stem with go up ring flange sliding fit, lower valve stem with lower ring flange sliding fit, the upper end of going up the valve stem and the lower extreme fixed connection of lead screw, the outside cover of lead screw is equipped with the guide pin bushing just the outer wall of lead screw with it has certain clearance to reserve between the inner wall of guide pin bushing, the periphery wall of the lower half of guide pin bushing with the inner wall of last sheath rotates and connects, the fixed screw that is provided with of the first half of guide pin bushing with lead screw looks adaptation, the fixed hand wheel that is provided with on.
Further, valve seat holes are formed in the two ends of the valve cavity of the valve body, and the rear valve seat, the front valve seat and the sliding sleeve are arranged in the valve seat holes.
Further, the outer fringe department of back disk seat and preceding disk seat has all seted up the spacing groove, the outer fringe department of sliding sleeve is provided with spacing arch, just spacing bellied periphery wall with the perisporium of disk seat hole contacts, spacing bellied internal perisporium with the perisporium of spacing groove contacts, spacing bellied tip with it has certain clearance to reserve between the side of spacing groove.
Furthermore, a plurality of first sealing rings are arranged at the contact positions of the inner peripheral wall of the limiting protrusion and the peripheral wall of the limiting groove.
Furthermore, a second sealing ring is arranged at a contact part of one end of the front valve seat, which is far away from the rear valve seat, close to the outer edge and the side end of the valve seat hole.
Compared with the prior art, the invention has the beneficial technical effects that:
the inlet and the outlet of the valve body are both of a double-valve-seat structure, a sliding sleeve is arranged between the front valve seat and the rear valve seat, and the pressure self-tightening is realized through the pressure difference between the front valve seat and the rear valve seat and between the valve body, the sliding sleeve and the flashboard when the valve body works, so that the purposes of preventing internal leakage and ensuring sealing are achieved; and adopt balanced sliding sleeve structure, easy dismounting makes maintenance work more swift.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of the upper structure of the present invention;
FIG. 3 is a schematic view of the partial structure of the upstream and downstream seals of the valve;
FIG. 4 is a schematic view of a partial structure of a fully-closed upstream seal of a valve;
fig. 5 is a partial structure schematic diagram of upstream seal failure and downstream seal of the valve.
Description of reference numerals: 1. a valve body; 2. a valve cavity; 3. a rear valve seat; 4. a front valve seat; 5. a sliding sleeve; 6. an upper flange plate; 7. a lower flange plate; 8. putting a sheath; 9. a lower sheath; 10. a shutter plate; 11. an upper valve stem; 12. a lower valve stem; 13. a screw rod; 14. a guide sleeve; 15. a nut; 16. a hand wheel; 17. a valve seat bore; 18. a limiting groove; 19. a limiting bulge; 20. a first seal ring; 21. a second seal ring; 22. a bearing; 23. and (4) mounting the groove.
Detailed Description
As shown in fig. 1-2, a pressure self-sealing leak-stopping gate valve structure comprises a valve body 1, a valve cavity 2 is arranged in the middle of the valve body 1, the valve body 1 is provided with a rear valve seat 3 and a front valve seat 4 from inside to outside at two ends of the valve cavity 2, and a sliding sleeve 5 is arranged between the rear valve seat 3 and the front valve seat 4.
An upper flange 6 and a lower flange 7 are respectively fixedly mounted at the upper end and the lower end of the valve body 1, an upper sheath 8 is fixedly mounted above the upper flange 6, and a lower sheath 9 is fixedly mounted below the lower flange 7. The valve body 1 is in install flashboard 10 in the valve pocket 2, the through-hole that is used for supplying the fluid to pass through when the valve is opened is offered to the first half of flashboard 10, the upper and lower both ends of flashboard 10 respectively with last valve rod 11 and lower valve rod 12 fixed connection, go up valve rod 11 with go up ring flange 6 sliding fit, lower valve rod 12 with lower ring flange 7 sliding fit.
The upper end of the upper valve rod 11 is fixedly connected with the lower end of a screw rod 13, a guide sleeve 14 is sleeved outside the screw rod 13, and a certain gap is reserved between the outer wall of the screw rod 13 and the inner wall of the guide sleeve 14. The outer peripheral wall of the lower half part of the guide sleeve 14 is rotatably connected with the inner wall of the upper sheath 8 through a bearing 22, the inner wall of the upper half part of the guide sleeve 14 is provided with a mounting groove 18, a nut 15 matched with the screw rod 13 is fixedly arranged in the mounting groove, and a plurality of balls capable of rolling freely are arranged on the inner wall of the nut 15. A hand wheel 16 is fixedly arranged on the outer wall of the upper half part of the guide sleeve 14 so as to operate the guide sleeve 14 to rotate.
Valve body 1 has all seted up valve seat hole 17 at the both ends of valve pocket 2, back disk seat 3, preceding disk seat 4 and sliding sleeve 5 install in valve seat hole 17.
The outer fringe department of back disk seat 3 and preceding disk seat 4 has all seted up spacing groove 18, the outer fringe department of sliding sleeve 5 is provided with spacing arch 19, just spacing arch 19 the periphery wall with the perisporium of disk seat hole 17 contacts, spacing arch 19 the internal perisporium with the perisporium of spacing groove 18 contacts, spacing arch 19 the tip with reserve between the side of spacing groove 18 and have certain clearance.
A plurality of first sealing rings 20 are mounted at the contact positions of the inner peripheral wall of the limiting protrusion 19 and the peripheral wall of the limiting groove 18. A second sealing ring 21 is arranged at the contact part of one end of the front valve seat 4, which is far away from the rear valve seat 3, close to the outer edge and the side end of the valve seat hole 17.
As shown in fig. 3, when the gate valve is fully opened, a pressure difference is formed between the upstream and downstream front valve seats and the valve body (pressure action ring area S1), between the front valve seat and the sliding sleeve (pressure action ring area S), and Δ S1= S-S1, so that the front valve seat and the sliding sleeve move relatively away from each other, and the front valve seat and the valve body are tightly attached to each other. Between the rear valve seat and the flashboard (pressure action ring area S2) and between the rear valve seat and the sliding sleeve (pressure action ring area S), the two form a pressure action area ring difference delta S2= S-S2, so that a pressure difference is formed, and the rear valve seat and the sliding sleeve move relatively away from each other, so that the rear valve seat and the flashboard are tightly attached. The pressure balance position of the sliding sleeve is kept unchanged, the front valve seat and the rear valve seat move relatively to be respectively sealed with the valve body and the gate plate, the upstream and downstream of the gate valve are sealed to prevent working media from entering the valve cavity, the purpose of preventing the inner leakage of the valve is achieved, and the use function of the gate valve is guaranteed.
As shown in fig. 4, when the gate valve is fully closed, only the pressure acting area annular difference is formed between the upstream front valve seat and the valve body and between the front valve seat and the sliding sleeve, so as to form a pressure difference, and the front valve seat and the sliding sleeve move relatively away from each other, so that the front valve seat and the valve body are tightly attached. Only the pressure acting area annular difference is formed between the upstream rear valve seat and the flashboard and between the rear valve seat and the sliding sleeve, so that pressure difference is formed, the rear valve seat and the sliding sleeve move relatively away from each other, and the rear valve seat and the flashboard are tightly attached. The upstream of the gate valve is sealed, and working media cannot enter the valve cavity, so that the internal leakage of the valve is prevented, the full-closed upstream sealing performance of the valve is realized, and the service function of the valve is ensured.
As shown in fig. 5, when the upstream seal fails, the working medium enters the valve cavity, and under the pressure of the working medium, pressure acting area annular differences are formed between the downstream front valve seat and the valve body and between the downstream front valve seat and the sliding sleeve, so that a pressure difference is formed, and the front valve seat and the sliding sleeve move relatively away from each other, so that the front valve seat and the valve body are tightly attached to each other. The rear valve seat and the flashboard in the downstream and the rear valve seat and the sliding sleeve form pressure action area annular difference, so that pressure difference is formed, the rear valve seat and the sliding sleeve generate relative movement in a separated mode, the rear valve seat is tightly attached to the flashboard, and the sealing performance of the downstream of the valve is realized.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (3)
1. The utility model provides a leak protection gate valve structure is proclaimed oneself to pressure which characterized in that: the valve comprises a valve body (1), a valve cavity (2) is arranged in the middle of the valve body (1), a rear valve seat (3) and a front valve seat (4) are sequentially arranged at two ends of the valve cavity (2) of the valve body (1) from inside to outside, and a sliding sleeve (5) is arranged between the rear valve seat (3) and the front valve seat (4); an upper flange (6) and a lower flange (7) are respectively fixedly arranged at the upper end and the lower end of the valve body (1), an upper sheath (8) is fixedly arranged above the upper flange (6), and a lower sheath (9) is fixedly arranged below the lower flange (7); the valve body (1) is provided with a flashboard (10) in the valve cavity (2), the upper half part of the flashboard (10) is provided with a through hole for a fluid to pass through when the valve is opened, the upper end and the lower end of the flashboard (10) are respectively fixedly connected with an upper valve rod (11) and a lower valve rod (12), the upper valve rod (11) is in sliding fit with the upper flange (6), the lower valve rod (12) is in sliding fit with the lower flange (7), the upper end of the upper valve rod (11) is fixedly connected with the lower end of a screw rod (13), the outer part of the screw rod (13) is sleeved with a guide sleeve (14), a certain gap is reserved between the outer wall of the screw rod (13) and the inner wall of the guide sleeve (14), the outer peripheral wall of the lower half part of the guide sleeve (14) is rotatably connected with the inner wall of the upper sheath (8), and a screw nut (15) matched with the screw rod (13) is fixedly arranged in the upper half part of the guide sleeve, a hand wheel (16) is fixedly arranged on the outer wall of the upper half part of the guide sleeve (14); the valve body (1) is provided with valve seat holes (17) at two ends of a valve cavity (2), the rear valve seat (3), the front valve seat (4) and the sliding sleeve (5) are arranged in the valve seat holes (17), limiting grooves (18) are formed in the outer edges of the rear valve seat (3) and the front valve seat (4), limiting protrusions (19) are arranged at the outer edges of the sliding sleeve (5), the outer peripheral walls of the limiting protrusions (19) are in contact with the peripheral walls of the valve seat holes (17), the inner peripheral walls of the limiting protrusions (19) are in contact with the peripheral walls of the limiting grooves (18), and a certain gap is reserved between the end portions of the limiting protrusions (19) and the side ends of the limiting grooves (18).
2. The pressure self-sealing leak-stopping gate valve structure of claim 1, wherein: the contact positions of the inner peripheral wall of the limiting protrusion (19) and the peripheral wall of the limiting groove (18) are provided with a plurality of first sealing rings (20).
3. The pressure self-sealing leak-stopping gate valve structure of claim 1, wherein: and a second sealing ring (21) is arranged at the contact part of one end of the front valve seat (4) departing from the rear valve seat (3) close to the outer edge and the side end of the valve seat hole (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910675772.8A CN110375080B (en) | 2019-07-25 | 2019-07-25 | Pressure self-sealing leak-proof gate valve structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910675772.8A CN110375080B (en) | 2019-07-25 | 2019-07-25 | Pressure self-sealing leak-proof gate valve structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110375080A CN110375080A (en) | 2019-10-25 |
| CN110375080B true CN110375080B (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910675772.8A Active CN110375080B (en) | 2019-07-25 | 2019-07-25 | Pressure self-sealing leak-proof gate valve structure |
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| Country | Link |
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| CN (1) | CN110375080B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5201872A (en) * | 1992-01-27 | 1993-04-13 | Superior Oilfield Products, Inc. | Gate valve improvement |
| RU2127389C1 (en) * | 1995-04-07 | 1999-03-10 | Борис Семенович Гольденберг | Gate valve |
| CN100365337C (en) * | 2003-01-17 | 2008-01-30 | Hp&T产品公司 | Valve sealing device and method |
| CN201475391U (en) * | 2009-08-06 | 2010-05-19 | 苏州道森压力控制有限公司 | Flat-plate gate valve with combined valve base |
| CN201739543U (en) * | 2010-04-27 | 2011-02-09 | 广东粤佳饲料有限公司 | Gate valve for granular media |
| CN204004499U (en) * | 2014-08-21 | 2014-12-10 | 金湖恒力机械有限公司 | A kind of double-valve-seat Double-sealing plate sluice valve |
| CN105351544A (en) * | 2015-12-11 | 2016-02-24 | 江苏宏泰石化机械有限公司 | Overlap-type hand wheel and hydraulic driving flat valve |
| CN205401781U (en) * | 2016-03-04 | 2016-07-27 | 苏州道森钻采设备股份有限公司 | Lead screw gate valve of variable rotational speed and torque |
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2019
- 2019-07-25 CN CN201910675772.8A patent/CN110375080B/en active Active
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| CN110375080A (en) | 2019-10-25 |
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