CN112610716B - Valve seat sealing structure - Google Patents
Valve seat sealing structure Download PDFInfo
- Publication number
- CN112610716B CN112610716B CN202110005252.3A CN202110005252A CN112610716B CN 112610716 B CN112610716 B CN 112610716B CN 202110005252 A CN202110005252 A CN 202110005252A CN 112610716 B CN112610716 B CN 112610716B
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- China
- Prior art keywords
- inclined plane
- ring
- valve seat
- graphite
- valve body
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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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0663—Packings
- F16K5/0673—Composite 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0663—Packings
- F16K5/0689—Packings between housing and plug
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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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
- F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
- F16K5/20—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
- F16K5/201—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces with the housing or parts of the housing mechanically pressing the seal against the plug
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gasket Seals (AREA)
- Taps Or Cocks (AREA)
Abstract
A kind of valve base seal structure, characterized by: a first inclined plane is formed at one end of the valve seat matched with the first graphite ring, a second inclined plane is correspondingly formed on the first graphite ring, an angle difference a is formed between the second inclined plane and the first inclined plane, and the initial contact between the second inclined plane and the first inclined plane is linear contact; a third inclined plane is formed at one end of the second graphite ring matched with the pressing ring, a fourth inclined plane is correspondingly formed on the pressing ring, an angle difference a is formed between the fourth inclined plane and the third inclined plane, and the initial contact between the fourth inclined plane and the third inclined plane is linear contact; the first inclined surface and the third inclined surface are inclined in opposite directions. The advantages are that: not only the torque of opening is little, opens and close easily, and sealed effect is better moreover.
Description
Technical Field
The invention relates to a valve seat sealing structure, in particular to a valve seat sealing structure.
Background
The fixed ball valve of traditional hard seal disk seat, its disk seat seal structure include disk seat, graphite circle, clamping ring, spring usually, through spring extrusion clamping ring, compress tightly the graphite circle by the clamping ring and realize sealing.
In order to guarantee the sealing effect of the graphite ring, a large elastic force is generally needed to satisfy the necessary sealing specific pressure, but the spring presses the pressing ring to press the graphite ring to realize sealing, the elastic force of the spring drives the whole valve seat to contact with the ball body at the same time, so as to realize initial sealing between the valve seat and the ball body, but the initial sealing force between the valve seat and the ball body is actually not needed to be so large, and the overlarge initial sealing force can easily cause the friction force between the valve seat and the ball body to be large on the contrary, so that the valve is large in opening torque and difficult to open and close, and the frictional wear of the sealing surface between the valve seat and the ball body is easily caused, thereby generating leakage and having low service life.
Disclosure of Invention
In order to overcome the defects of the background art, the invention provides a valve seat sealing structure.
The technical scheme adopted by the invention is as follows: a valve seat sealing structure comprises a valve body, a ball body and a valve seat arranged between the valve body and the ball body; an installation groove is formed between the outer ring of the valve seat and the valve body, and a sealing assembly is arranged in the installation groove; the sealing assembly comprises a first graphite ring, a gasket, a second graphite ring, a pressing ring and an elastic piece which are sequentially arranged, wherein one end of the elastic piece is abutted against the valve body, the other end of the elastic piece compresses the pressing ring, and the pressing ring, the second graphite ring, the gasket, the first graphite ring and the valve seat are driven to be in contact sealing with each other; a first inclined plane is formed at one end of the valve seat matched with the first graphite ring, a second inclined plane is correspondingly formed on the first graphite ring, an angle difference a is formed between the second inclined plane and the first inclined plane, and the second inclined plane is in line contact with the first inclined plane at initial contact; a third inclined plane is formed at one end, matched with the pressing ring, of the second graphite ring, a fourth inclined plane is correspondingly formed on the pressing ring, an angle difference a is formed between the fourth inclined plane and the third inclined plane, and the initial contact between the fourth inclined plane and the third inclined plane is linear contact; the first inclined plane and the third inclined plane incline in opposite directions.
The first inclined surface inclines towards the direction of the ball body, an included angle formed between the second inclined surface and the inner wall of the valve body is smaller than an included angle formed between the first inclined surface and the inner wall of the valve body, and the initial contact position of the second inclined surface and the first inclined surface is close to the outer ring position of the first inclined surface; an included angle formed between the third inclined plane and the inner wall of the valve body is larger than an included angle formed between the fourth inclined plane and the inner wall of the valve body, and the initial contact position of the fourth inclined plane and the third inclined plane is close to the inner ring position of the third inclined plane.
The symmetry in packing ring both ends is formed with V type contact surface, first graphite circle all is formed with V type annular with packing ring complex one end, be formed with the angular difference b between the lateral wall of V type contact surface and V type annular, the initial contact of V type contact surface and V type annular is two line contacts.
The matching structure of the second graphite ring and the V-shaped contact surface is the same as that of the first graphite ring.
The angle difference a and the angle difference b have the same magnitude.
The angle difference a and the angle difference b are 2-3 degrees.
The mounting groove is L-shaped, and the pressing ring is L-shaped correspondingly.
The elastic piece is a disc spring.
At least two graphite dust rings are formed between the valve seat and the valve body, and the graphite dust rings are respectively arranged on the left side and the right side of the mounting groove.
The invention has the beneficial effects that: 1. because the initial contact among the valve seat, the first graphite ring, the gasket, the second graphite ring and the pressing ring is linear contact, the required initial sealing can be achieved only by small pretightening force, correspondingly, the initial sealing force of the valve seat acting on the ball body can be reduced, and the opening torque of the valve can be further reduced, so that the technical effects of easy opening and closing of the valve and prolonging the service life of the valve are achieved;
2. the sealing contact position of the valve seat and the first graphite ring is close to the outer ring, the sealing contact position of the second graphite ring and the pressing ring is close to the inner ring, and the sealing contact positions of the gasket, the first graphite ring and the second graphite ring are close to the middle part, so that multi-sealing of the inner ring and the outer ring is effectively formed, and the sealing effect of the valve seat is better;
3. the sealing surfaces of the valve seat, the first graphite ring, the gasket, the second graphite ring and the pressing ring are inclined plane structures, and form relatively symmetrical structures on the whole, and the first graphite ring and the second graphite ring can be uniformly compressed, so that the sealing performance of the graphite rings is improved, and the effect of improving the sealing performance of the valve seat is achieved.
Drawings
Fig. 1 is a schematic structural diagram of a slag locking valve according to an embodiment of the invention.
Fig. 2 is a schematic structural view of a valve seat sealing structure according to an embodiment of the present invention.
Fig. 3 is an enlarged schematic view of a point a in fig. 2.
Fig. 4 is an enlarged schematic view of fig. 2 at B.
Fig. 5 is an enlarged schematic view at C in fig. 2.
Detailed Description
The embodiments of the invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1-2, a lock sediment valve specifically is a fixed ball valve, and its valve seat seal structure includes valve body 1, spheroid 2, disk seat 3 sets up between valve body 1 and spheroid 2, be formed with mounting groove 4 that is the L type structure between 3 outer lanes of disk seat and the valve body 1, first graphite circle 5, packing ring 6, second graphite circle 7, clamping ring 8, elastic component 9 have set gradually in mounting groove 4, wherein the clamping ring correspondence is the L type, elastic component 9 is the dish spring, elastic component 9 one end offsets with valve body 1, and the other end compresses tightly clamping ring 8, orders about clamping ring 8, second graphite circle 7, packing ring 6, first graphite circle 5, disk seat 3 mutual contact seal, realizes the seal between valve body 1 and the disk seat 3 through first graphite circle 5 and second graphite circle 7, and elastic component 9 can order about disk seat 3 and spheroid 2 contact seal simultaneously.
As shown in fig. 2-5, the end of the valve seat 3 that is engaged with the first graphite ring 5 forms a first inclined surface 31, and the inclined direction of the first inclined surface 31 is generally towards the ball for the convenience of manufacturing process.
A second inclined plane 51 is formed at one end of the first graphite ring 5 corresponding to the first inclined plane 31, the inclined angle of the second inclined plane 51 is different from that of the first inclined plane 31, and an angle difference a is formed between the two inclined planes, so that when the second inclined plane 51 contacts with the first inclined plane 31, the initial contact surface is in line contact.
The angle difference a is 2-3 °, and an included angle formed between the second inclined surface 51 and the inner wall of the valve body 1 is smaller than an included angle formed between the first inclined surface 31 and the inner wall of the valve body 1, so that the initial contact position of the second inclined surface 51 and the first inclined surface 31 is close to the outer ring position of the first inclined surface 31.
The end of the pressing ring 8, which is matched with the second graphite ring 7, forms a fourth inclined plane 81, and the inclined direction of the fourth inclined plane 81 is opposite to that of the first inclined plane 31 and the inclined angle is the same.
The second graphite ring 7 has a third inclined surface 71 formed at an end thereof corresponding to the fourth inclined surface 81, and the third inclined surface 71 and the fourth inclined surface 81 have different inclination angles and an angle difference a therebetween, so that when the third inclined surface 71 and the fourth inclined surface 81 contact each other, the initial contact surface thereof is in line contact.
The angle difference a is 2-3 degrees, and the included angle formed between the third inclined surface 71 and the inner wall of the valve body 1 is larger than the included angle formed between the fourth inclined surface 81 and the inner wall of the valve body 1, so that the initial contact position of the third inclined surface 71 and the fourth inclined surface 81 is close to the inner ring position of the fourth inclined surface 81.
6 both ends symmetries of packing ring are formed with V type contact surface 61, first graphite circle 5 is formed with V type ring groove 51 with 6 complex one end of packing ring, the contained angle that V type contact surface 61 formed forms the contained angle with V type ring groove 51 and is different, and consequently the inclination of V type contact surface 61 lateral wall and V type ring groove 51 lateral wall is different, is formed with the angular difference b between the two, and wherein, the size of angular difference b is 2-3, just V type contact surface 61's angle is greater than the angle of V type ring groove 51, and consequently the initial contact of V type contact surface 61 of packing ring 6 and first graphite circle 5's V type ring groove 51 is two line contacts.
Similarly, the end of the second graphite ring 7 that is engaged with the gasket 6 forms a V-shaped annular groove with the same structure, so the initial contact between the second graphite ring 7 and the gasket 6 is the same two-line contact.
When above-mentioned lock sediment valve adopted foretell disk seat seal structure, because disk seat 3, first graphite circle 5, packing ring 6, second graphite circle 7, the initial contact of clamping ring 8 each other is line contact, consequently only need very little pretightning force just can reach required initial seal, consequently the elastic component 9 only need provide very little elastic force alright, it is corresponding, the initial sealing force that disk seat 3 is used in on spheroid 1 has also reduced, and then can reduce the moment of torsion of opening of valve, thereby it is light to reach the valve and open and close, prolong its life's technological effect.
Meanwhile, the sealing contact position of the valve seat 3 and the first graphite ring 5 is close to the outer ring, the sealing contact position of the second graphite ring 7 and the pressing ring 8 is close to the inner ring, and the sealing contact position of the gasket 6 and the first graphite ring 5 and the second graphite ring 7 is close to the middle part, so that multi-sealing of the inner ring and the outer ring is effectively formed, and the sealing effect of the valve seat is better; and the sealed face of disk seat 3, first graphite circle 5, packing ring 6, second graphite circle 7, clamping ring 8 each other is the inclined plane structure, and constitutes the structure of relative symmetry on the whole, and first graphite circle 5 and second graphite circle 7 can be evenly compressed to improve the sealing performance of graphite circle, reach the effect that improves disk seat sealing performance.
In addition, be formed with twice graphite dust ring 10 between disk seat 3 and the valve body 1, twice graphite dust ring 10 sets up respectively in the left and right sides of mounting groove 4 to form twice protective structure to mounting groove 4, avoid large granule medium to enter into and destroy its sealing performance in mounting groove 4, further improve life.
Of course, the valve seat sealing structure is not limited to the slag locking valve shown in fig. 1, and can be used for other disclosures, the graphite sealing structure is suitable for various working environments such as high temperature and high pressure, the application range is wide, and the practicability is high.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The skilled person should understand that: although the invention has been described in terms of the above specific embodiments, the inventive concept is not limited thereto and any modification applying the inventive concept is intended to be included within the scope of the patent claims.
Claims (8)
1. A valve seat sealing structure comprises a valve body (1), a ball body (2) and a valve seat (3) arranged between the valve body (1) and the ball body (2); an installation groove (4) is formed between the outer ring of the valve seat (3) and the valve body (1), and a sealing assembly is arranged in the installation groove (4); the sealing assembly comprises a first graphite ring (5), a gasket (6), a second graphite ring (7), a pressing ring (8) and an elastic piece (9) which are sequentially arranged, one end of the elastic piece (9) is abutted against the valve body (1), and the other end of the elastic piece (9) presses the pressing ring (8) to drive the pressing ring (8), the second graphite ring (7), the gasket (6), the first graphite ring (5) and the valve seat (3) to be in contact sealing with each other;
the method is characterized in that: a first inclined plane (31) is formed at one end, matched with the first graphite ring (5), of the valve seat (3), a second inclined plane (51) is correspondingly formed on the first graphite ring (5), an angle difference a is formed between the second inclined plane (51) and the first inclined plane (31), and the initial contact between the second inclined plane (51) and the first inclined plane (31) is line contact;
a third inclined plane (71) is formed at one end, matched with the pressing ring (8), of the second graphite ring (7), a fourth inclined plane (81) is correspondingly formed on the pressing ring (8), an angle difference a is formed between the fourth inclined plane (81) and the third inclined plane (71), and the initial contact between the fourth inclined plane (81) and the third inclined plane (71) is line contact;
the first inclined surface (31) and the third inclined surface (71) are inclined in opposite directions;
packing ring (6) both ends symmetry is formed with V type contact surface (61), first graphite circle (5) all are formed with V type annular (51) with packing ring (6) complex one end, be formed with angle difference b between the lateral wall of V type contact surface (61) and V type annular (51), V type contact surface (61) are two line contacts with the initial contact of V type annular.
2. The valve seat sealing structure according to claim 1, wherein: the first inclined surface (31) inclines towards the sphere direction, an included angle formed between the second inclined surface (51) and the inner wall of the valve body (1) is smaller than an included angle formed between the first inclined surface (31) and the inner wall of the valve body (1), and the initial contact position of the second inclined surface (51) and the first inclined surface (31) is close to the outer ring position of the first inclined surface (31);
the included angle that forms between third inclined plane (71) and valve body (1) inner wall is bigger than the included angle that forms between fourth inclined plane (81) and valve body (1) inner wall, the initial contact position of fourth inclined plane (81) and third inclined plane (81) is close to the inner circle position of third inclined plane (71).
3. The valve seat sealing structure according to claim 1, wherein: the matching structure of the second graphite ring (7) and the V-shaped contact surface (61) is the same as that of the first graphite ring (5).
4. The valve seat sealing structure according to claim 3, wherein: the angle difference a and the angle difference b have the same magnitude.
5. The valve seat sealing structure according to claim 4, wherein: the angle difference a and the angle difference b are 2-3 degrees.
6. The valve seat sealing structure according to claim 1, wherein: the mounting groove (4) is L-shaped, and the pressing ring (8) is L-shaped correspondingly.
7. The valve seat sealing structure according to claim 6, wherein: the elastic piece (9) is a disc spring.
8. The valve seat sealing structure according to claim 1, wherein: at least two graphite dust rings (10) are formed between the valve seat (3) and the valve body (1), and the graphite dust rings (10) are respectively arranged on the left side and the right side of the mounting groove (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110005252.3A CN112610716B (en) | 2021-01-05 | 2021-01-05 | Valve seat sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110005252.3A CN112610716B (en) | 2021-01-05 | 2021-01-05 | Valve seat sealing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112610716A CN112610716A (en) | 2021-04-06 |
| CN112610716B true CN112610716B (en) | 2023-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110005252.3A Active CN112610716B (en) | 2021-01-05 | 2021-01-05 | Valve seat sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112610716B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115854060B (en) * | 2023-02-28 | 2023-04-28 | 成都成高阀门有限公司 | High-performance metal sealing ball valve |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202082422U (en) * | 2011-05-12 | 2011-12-21 | 周逸亭 | Improved sealing structure of valve seat assembly of hard sealing ball valve |
| CN203670884U (en) * | 2013-12-27 | 2014-06-25 | 西诺威阀门控制（苏州）有限公司 | Hard seal ball valve with trapezoid graphite seal rings |
| BR112017024263B1 (en) * | 2015-05-13 | 2022-02-15 | Kitz Corporation | TRUNNION TYPE BALL VALVE, VALVE SEALING STRUCTURE AND VALVE PACKAGING |
| CN107061781A (en) * | 2017-06-19 | 2017-08-18 | 中山铁王流体控制设备有限公司 | A kind of double graphite hard seal ball valves of low torque all-metal |
| CN209294454U (en) * | 2018-12-07 | 2019-08-23 | 超达阀门集团股份有限公司 | A kind of valve base sealing structure and the low temperature fixing ball valve with the sealing structure |
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2021
- 2021-01-05 CN CN202110005252.3A patent/CN112610716B/en active Active
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| CN112610716A (en) | 2021-04-06 |
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