CN210153325U - Piston effect self-sealing ball valve - Google Patents
Piston effect self-sealing ball valve Download PDFInfo
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- CN210153325U CN210153325U CN201921073562.3U CN201921073562U CN210153325U CN 210153325 U CN210153325 U CN 210153325U CN 201921073562 U CN201921073562 U CN 201921073562U CN 210153325 U CN210153325 U CN 210153325U
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Abstract
The utility model discloses a piston effect self-sealing ball valve, including valve body, valve rod, locating part, packing sealing mechanism, radial axial elastic sealing mechanism and connection pad, the connection pad is fixed on the valve body, the upper end of valve rod is located outside the valve body, and the lower extreme passes the connection pad and stretches into in the valve body, be provided with annular boss on the valve rod, radial axial elastic sealing mechanism sets up between valve rod and the valve body below annular boss, is used for to valve rod radial static seal and axial dynamic seal; the packing sealing mechanism is fixed between the valve rod above the annular boss and the valve body, and the limiting part is fixed between the packing sealing mechanism and the annular boss and used for limiting the annular boss. The utility model discloses can improve the sealing performance of valve rod, ensure that the valve rod can be stable sealed under long-term frequent switch to improve valve life and product quality.
Description
Technical Field
The utility model belongs to the technical field of the valve, concretely relates to piston effect self-sealing formula ball valve.
Background
The ball valve is mainly used for cutting off, distributing and changing the flow direction of a medium in a pipeline, and can be closed tightly only by rotating 90 degrees and a small rotating moment. With the rapid development of science and technology, the continuous improvement of production process and product structure, ball valves have rapidly developed into a main valve class. The ball valve is widely applied to industries such as petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmacy, water conservancy, electric power, municipal administration, steel and the like, and plays a significant role in national economy.
Most of valve rod sealing structures of the existing ball valves adopt O-shaped sealing ring sealing and pre-tightening packing sealing, and belong to valve rod radial sealing in the sealing direction. The sealing easily causes abrasion of an O-shaped sealing ring and a pre-tightening filler along with the rotation of the valve rod, cannot compensate by self, and easily causes failure of the sealing of the valve rod. And as time goes on, the O-shaped sealing ring and the packing are easy to age and the elastic failure can cause the leakage of the sealing part of the valve rod. In addition, the existing valve rod sealing structure has high requirements on processing precision, time consumption for processing, low production efficiency and unstable sealing performance, and particularly, a small-caliber valve is difficult to meet the precision requirement, and the sealing structure is more difficult to meet the expected requirement.
The prior art with the Chinese patent application number of 201710903606.X discloses a sealed self-compensating ball valve in 2017, 12 and 22 months, wherein the sealed self-compensating ball valve comprises a spring, a floating sleeve, a sealing ring, a ball body, a valve cover, a valve body, a spring, a packing press ring, packing and a valve rod. This patent can realize automatic compensation when sealed effect is relatively poor through the spring to improve sealed effect. However, the ball valve still belongs to the radial sealing of the valve rod, and the sealing failure is still easy to occur when the ball valve is frequently used for a long time.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the above-mentioned problem that exists among the prior art, provide a piston effect self-sealing formula ball valve, the utility model discloses can improve the sealing performance of valve rod, ensure that the valve rod can be stable sealed under long-term frequent switch to improve valve life and product quality.
In order to achieve the above object, the utility model adopts the following technical scheme:
a piston effect self-sealing ball valve is characterized in that: the sealing device comprises a valve body, a valve rod, a limiting part, a packing sealing mechanism, a radial axial elastic sealing mechanism and a connecting disc, wherein the connecting disc is fixed on the valve body, the upper end of the valve rod is positioned outside the valve body, the lower end of the valve rod penetrates through the connecting disc and extends into the valve body, an annular boss is arranged on the valve rod, and the radial axial elastic sealing mechanism is arranged between the valve rod below the annular boss and the valve body and is used for radially and dynamically sealing and axially moving the valve rod; the packing sealing mechanism is fixed between the valve rod above the annular boss and the valve body, and the limiting part is fixed between the packing sealing mechanism and the annular boss and used for limiting the annular boss.
A plane bearing is arranged between the packing sealing mechanism and the annular boss, a sliding bearing is arranged between the valve body and the valve rod, and the sliding bearing is located below the radial axial elastic sealing mechanism.
The radial and axial elastic sealing mechanism comprises a sealing support ring, an elastic element, a static sealing piece for radial static sealing of the valve rod and a dynamic sealing piece for axial dynamic sealing of the valve rod, the sealing support ring is movably arranged between the valve body and the valve rod, the dynamic sealing piece is arranged between the sealing support ring and the annular boss, the static sealing piece and the elastic element are both arranged between the sealing support ring and the valve body, and the static sealing piece is positioned between the elastic element and the dynamic sealing piece.
The valve body is internally provided with a lower step surface, the sealing support ring is positioned between the lower step surface and the annular boss, the sealing support ring extends downwards to form an extending section, and the extending section extends between the valve body below the lower step surface and the valve rod.
The dynamic sealing element is a rectangular sealing ring, and the static sealing element is an O-shaped sealing ring.
The packing sealing mechanism comprises a packing box, an outer packing and an inner packing, the packing box is fixed between the valve body and the valve rod through a limiting part and a connecting disc, the outer packing is arranged between the packing box and the valve body, and the inner packing is arranged between the packing box and the valve rod.
The cross section of the stuffing box is of a convex structure, the upper end of the stuffing box is located in a groove formed in the connecting disc, a notch matched with the limiting part is formed in one side of the lower end of the stuffing box, the outer stuffing is located between the upper end of the stuffing box and the valve body, and the inner stuffing is located between the lower end of the stuffing box and the valve rod.
An upper step surface is arranged in the valve body, a clamping groove is formed in the side wall of the upper step surface, one side of the limiting part is installed in the clamping groove, and the other side of the limiting part is located between the packing sealing mechanism and the annular boss.
The limiting part is a four-open ring.
Adopt the utility model has the advantages of:
1. the utility model discloses a radial axial elastic sealing mechanism can realize radial static seal and axial dynamic seal to the valve rod respectively, when the sealing member wearing and tearing or ageing, can carry out the compensation of sealed face by oneself under the combined action of ascending thrust of medium and elastic force, and sealed effect is more reliable stable. Compared with the prior art, the utility model provides the high sealing performance of valve rod ensures that the valve rod can stably seal under long-term frequent switch, has reached the purpose that improves valve life and product quality.
2. The utility model discloses a set up plane bearing and slide bearing in the valve body, be favorable to the nimble control of valve rod.
3. The utility model provides a radial axial elastic sealing mechanism is including sealing support ring, elastic element, quiet sealing member and dynamic seal spare, adopt the radial axial elastic sealing mechanism of this structure, dynamic seal spare accessible elastic element provides initial pretightning force and realizes initial seal initially, along with medium pressure entering valve rod seal department in the valve body, ascending medium pressure can produce medium pressure difference between valve body and sealing support ring, thereby form piston effect, dynamic seal spare can paste the annular boss sealing face of tight valve rod all the time under medium pressure thrust and elastic element's effect, the wearing and tearing that the compensation arouses when by valve rod switch operation, thereby make the sealed effect of valve rod more reliable and more stable.
4. The utility model discloses a set up the outer filler between packing box and valve body and set up the interior filler between packing box and valve rod for the valve rod has multiple seal structure, can ensure that valve rod sealing department reaches the purpose of zero leakage.
5. The utility model discloses mainly install the completion through the solid mode of mutual card, have that processing is simple high-efficient, production efficiency is high, the product percent of pass is high, sealing performance is stable for a long time, practice thrift advantages such as manufacturing cost.
Drawings
Fig. 1 is a schematic structural view of the present invention;
labeled as: 1. the valve comprises a valve body, 2, a sliding bearing, 3, a valve rod, 4, an elastic element, 5, a sealing support ring, 6, a static sealing element, 7, a dynamic sealing element, 8, a limiting piece, 9, a packing box, 10, an outer packing, 11, an inner packing, 12, a plane bearing, 13, an extending section, 14, a connecting disc, 15, an annular boss, 16, a lower step surface, 17 and an upper step surface.
Detailed Description
Example 1
The present embodiment provides a piston effect self-sealing ball valve, as shown in fig. 1, which comprises a valve body 1, a valve stem 3, a limiting member 8, a packing seal mechanism, a flat bearing 12, a sliding bearing 2, a radial and axial elastic seal mechanism and a connecting disc 14, the connecting disc 14 is fixed on the valve body 1 through fasteners such as bolts, the upper end of the valve rod 3 is positioned outside the valve body 1, the lower end of the valve rod penetrates through the connecting disc 14 and extends into the valve body 1 to be connected with the ball body, the valve rod 3 is provided with an annular boss 15, the radial and axial elastic sealing mechanism and the sliding bearing 2 are both arranged between the valve rod 3 and the valve body 1 below the annular boss 15, the sliding bearing 2 is positioned below the radial and axial elastic sealing mechanism, is used for preventing the valve rod 3 from being seized when rotating and preventing impurities in the medium in the inner cavity from entering the sealing part of the valve rod 3, the radial and axial elastic sealing mechanism is used for respectively carrying out radial static sealing and axial dynamic sealing on the valve rod 3; the packing sealing mechanism is fixed between the valve rod 3 above the annular boss 15 and the valve body 1, and the limiting piece 8 is fixed between the packing sealing mechanism and the annular boss 15 and used for limiting the annular boss 15; the flat bearing 12 is arranged between the packing seal and the annular projection 15.
In this embodiment, the radial static seal is used for sealing the radial direction of the valve rod 3, and the sealing element does not move; the axial dynamic seal is used for dynamically sealing the axial direction of the valve rod 3, and after the sealing element is worn, the sealing element can axially move under the action of elastic force when the sealing element is worn, so that the degree of wear is automatically compensated.
In the present embodiment, the radial and axial elastic sealing mechanism comprises a sealing support ring 5, an elastic element 4, a static seal 6 for radially and statically sealing the valve rod 3, and a dynamic seal 7 for axially and dynamically sealing the valve rod 3. A lower step surface 16 is arranged in the valve body 1, the sealing support ring 5 is movably arranged between the valve body 1 and the valve rod 3, and the sealing support ring 5 is positioned between the lower step surface 16 and the annular boss 15. The sealing support ring 5 extends downwards to form an extending section 13 with the outer diameter smaller than that of the sealing support ring 5, and the extending section 13 extends between the valve body 1 and the valve rod 3 below the lower step surface 16. The dynamic seal 7 is arranged between the seal support ring 5 and the annular boss 15, the static seal 6 and the elastic element 4 are both arranged between the seal support ring 5 and the valve body 1, and the static seal 6 is positioned between the elastic element 4 and the dynamic seal 7. The dynamic sealing element 7 is preferably a rectangular sealing ring with a rectangular cross section, the static sealing element 6 is preferably an O-shaped sealing ring, and the elastic element 4 is preferably a spring. Specifically, the seal support ring 5 comprises a large cylindrical section and a small cylindrical section, mounting grooves are formed in the end face and the annular face of the large cylindrical section, the movable sealing element 7 is fixed in the mounting groove in the end face, the static sealing element 6 is fixed in the mounting groove in the annular face, and the elastic element 4 is sleeved on the small cylindrical section. The extending section 13 is formed by downward extending of the small cylindrical section, and the outer diameter of the intervening section is smaller than that of the small cylindrical section. When in use, under the combined action of the acting force of the elastic element 4 and the thrust generated upwards by the medium, the dynamic sealing element 7 is always tightly attached to the annular boss 15 of the valve rod 3 to perform axial dynamic sealing on the valve rod 3. When the dynamic sealing element 7 is abraded, the abrasion can be automatically compensated under the action force, so that the sealing effect of the valve rod 3 is more stable and reliable.
In this embodiment, an upper stepped surface 17 is further disposed in the valve body 1, a clamping groove is disposed on a side wall of the upper stepped surface 17, a bottom surface of the clamping groove is preferably the same plane as the upper stepped surface 17, and the limiting member 8 is preferably a four-ring opening. During installation, one side of the limiting part 8 is installed in the clamping groove, and the other side of the limiting part is located between the packing sealing mechanism and the annular boss 15 and used for limiting the annular boss 15.
In this embodiment, the filling and sealing mechanism is implemented by arranging a filler between the valve body 1 and the valve rod 3 and adopting an existing conventional structure.
The utility model discloses an implement the principle and do:
during initial use, O shape sealing washer carries out static seal to valve rod 3 in radial direction, the rectangle sealing washer provides initial pretightning force through elastic element 4 and realizes initial sealing, along with medium pressure entering valve rod 3 sealed department in the valve body 1, ascending medium pressure can produce medium pressure differential between valve body 1 and seal support ring 5, thereby form piston effect, the rectangle sealing washer can paste the annular boss 15 of tight valve rod 3 all the time under medium pressure thrust and elastic element 4's effect, the compensation is by the wearing and tearing that arouse during valve rod 3 switch operation, thereby make the sealed effect of valve rod 3 more reliable and more stable.
Example 2
The present embodiment provides a piston effect self-sealing ball valve, as shown in fig. 1, which comprises a valve body 1, a valve stem 3, a limiting member 8, a packing seal mechanism, a flat bearing 12, a sliding bearing 2, a radial and axial elastic seal mechanism and a connecting disc 14, the connecting disc 14 is fixed on the valve body 1 through fasteners such as bolts, the upper end of the valve rod 3 is positioned outside the valve body 1, the lower end of the valve rod penetrates through the connecting disc 14 and extends into the valve body 1 to be connected with the ball body, the valve rod 3 is provided with an annular boss 15, the radial and axial elastic sealing mechanism and the sliding bearing 2 are both arranged between the valve rod 3 and the valve body 1 below the annular boss 15, the sliding bearing 2 is positioned below the radial and axial elastic sealing mechanism, is used for preventing the valve rod 3 from being seized when rotating and preventing impurities in the medium in the inner cavity from entering the sealing part of the valve rod 3, the radial and axial elastic sealing mechanism is used for respectively carrying out radial static sealing and axial dynamic sealing on the valve rod 3; the packing sealing mechanism is fixed between the valve rod 3 above the annular boss 15 and the valve body 1, and the limiting piece 8 is fixed between the packing sealing mechanism and the annular boss 15 and used for limiting the annular boss 15; the flat bearing 12 is arranged between the packing seal and the annular projection 15.
In the present embodiment, the radial and axial elastic sealing mechanism comprises a sealing support ring 5, an elastic element 4, a static seal 6 for radially and statically sealing the valve rod 3, and a dynamic seal 7 for axially and dynamically sealing the valve rod 3. A lower step surface 16 is arranged in the valve body 1, the sealing support ring 5 is movably arranged between the valve body 1 and the valve rod 3, and the sealing support ring 5 is positioned between the lower step surface 16 and the annular boss 15. The sealing support ring 5 extends downwards to form an extending section 13 with the outer diameter smaller than that of the sealing support ring 5, and the extending section 13 extends between the valve body 1 and the valve rod 3 below the lower step surface 16. The dynamic seal 7 is arranged between the seal support ring 5 and the annular boss 15, the static seal 6 and the elastic element 4 are both arranged between the seal support ring 5 and the valve body 1, and the static seal 6 is positioned between the elastic element 4 and the dynamic seal 7. The dynamic sealing element 7 is preferably a rectangular sealing ring with a rectangular cross section, the static sealing element 6 is preferably an O-shaped sealing ring, and the elastic element 4 is preferably a spring. Specifically, the seal support ring 5 comprises a large cylindrical section and a small cylindrical section, mounting grooves are formed in the end face and the annular face of the large cylindrical section, the movable sealing element 7 is fixed in the mounting groove in the end face, the static sealing element 6 is fixed in the mounting groove in the annular face, and the elastic element 4 is sleeved on the small cylindrical section. The extending section 13 is formed by downward extending of the small cylindrical section, and the outer diameter of the intervening section is smaller than that of the small cylindrical section. When in use, under the combined action of the acting force of the elastic element 4 and the thrust generated upwards by the medium, the dynamic sealing element 7 is always tightly attached to the annular boss 15 of the valve rod 3 to perform axial dynamic sealing on the valve rod 3. When the dynamic sealing element 7 is abraded, the abrasion can be automatically compensated under the action force, so that the sealing effect of the valve rod 3 is more stable and reliable.
In this embodiment, an upper stepped surface 17 is further disposed in the valve body 1, a clamping groove is disposed on a side wall of the upper stepped surface 17, a bottom surface of the clamping groove is preferably the same plane as the upper stepped surface 17, and the limiting member 8 is preferably a four-ring opening. During installation, one side of the limiting part 8 is installed in the clamping groove, and the other side of the limiting part is located between the packing sealing mechanism and the annular boss 15 and used for limiting the annular boss 15.
In this embodiment, the packing sealing mechanism includes a packing box 9, an outer packing 10 and an inner packing 11, the packing box 9 is fixed between the valve body 1 and the valve rod 3 through a limiting member 8 and a connecting disc 14, the outer packing 10 is arranged between the packing box 9 and the valve body 1, and the inner packing 11 is arranged between the packing box 9 and the valve rod 3. Specifically, the cross section of the stuffing box 9 is of a convex structure, a protruding part extending into the valve body 1 is arranged on the connecting disc 14, and a groove is formed in the protruding part. During installation, the upper end of the stuffing box 9 is installed in the groove, one side of the lower end of the stuffing box 9 is provided with a notch matched with the limiting part 8, the outer stuffing 10 is located between the upper end of the stuffing box 9 and the valve body 1, the inner stuffing 11 is located between the lower end of the stuffing box 9 and the valve rod 3, and the planar bearing 12 is installed between the stuffing box 9 and the annular boss 15. The valve rod 3 is sealed in multiple ways through the outer filler 10 and the inner filler 11, and the sealing effect is further improved.
Example 3
The utility model discloses research and development is accomplished to prepare to get into the actual production stage, equipment model is: DW19Q4(6)7F-SM, coverage: DN50 ≦ valve caliber ≦ DN1200, CL150 ≦ valve pressure ≦ CL 2500. And, still test equipment, test duration: by carrying out periodic sealing detection on the product, 2 weeks are separated in one year, and each pressure test is carried out for 4 hours.
The test method comprises the following steps:
and 1, performing static seal test on the valve rod seal by feeding pressure (respectively applying low pressure and high pressure) in the valve body cavity without rotating the valve rod. As a result: the sealing performance is excellent under low pressure and high pressure each time. No leakage occurs during the one-year time period.
And 2, respectively pressing the inlet end of the valve and the cavity of the valve body, rotating the valve rod through an electric actuator to drive the ball to open and close, performing opening and closing operation on the valve rod for not less than 10000 times within a one-year test period, and performing action sealing detection on the sealing part of the valve rod. As a result: under the condition that there is pressure at the valve rod sealing position, frequent operation valve rod, no matter the valve rod sealing position low pressure high pressure sealed effect all does not have the leakage condition to produce, and sealing performance is very stable, excellent. The valve is flexible to operate, light and convenient and has no blocking phenomenon.
Prove from this the utility model discloses life improves greatly, reaches more than the twice than the life of conventional valve at least.
Claims (9)
1. A piston effect self-sealing ball valve is characterized in that: the sealing device comprises a valve body (1), a valve rod (3), a limiting piece (8), a packing sealing mechanism, a radial axial elastic sealing mechanism and a connecting disc (14), wherein the connecting disc (14) is fixed on the valve body (1), the upper end of the valve rod (3) is positioned outside the valve body (1), the lower end of the valve rod penetrates through the connecting disc (14) and extends into the valve body (1), an annular boss (15) is arranged on the valve rod (3), and the radial axial elastic sealing mechanism is arranged between the valve rod (3) and the valve body (1) below the annular boss (15) and used for radially static sealing and axially dynamic sealing the valve rod (3); the packing sealing mechanism is fixed between the valve rod (3) above the annular boss (15) and the valve body (1), and the limiting piece (8) is fixed between the packing sealing mechanism and the annular boss (15) and used for limiting the annular boss (15).
2. A piston effect self-sealing ball valve as claimed in claim 1, wherein: a plane bearing (12) is arranged between the packing sealing mechanism and the annular boss (15), a sliding bearing (2) is arranged between the valve body (1) and the valve rod (3), and the sliding bearing (2) is located below the radial axial elastic sealing mechanism.
3. A piston effect self-sealing ball valve according to claim 1 or 2, wherein: the radial axial elastic sealing mechanism comprises a sealing support ring (5), an elastic element (4), a static sealing piece (6) for radial static sealing of the valve rod (3) and a dynamic sealing piece (7) for axial dynamic sealing of the valve rod (3), wherein the sealing support ring (5) is movably arranged between the valve body (1) and the valve rod (3), the dynamic sealing piece (7) is arranged between the sealing support ring (5) and the annular boss (15), the static sealing piece (6) and the elastic element (4) are both arranged between the sealing support ring (5) and the valve body (1), and the static sealing piece (6) is positioned between the elastic element (4) and the dynamic sealing piece (7).
4. A piston effect self-sealing ball valve according to claim 3, wherein: be provided with lower step face (16) in valve body (1), sealed support ring (5) are located between lower step face (16) and annular boss (15), and sealed support ring (5) downwardly extending is formed with and stretches into section (13), stretches into between section (13) stretch into valve body (1) and valve rod (3) of lower step face (16) below.
5. A piston effect self-sealing ball valve according to claim 3, wherein: the dynamic sealing element (7) is a rectangular sealing ring, and the static sealing element (6) is an O-shaped sealing ring.
6. A piston effect self-sealing ball valve according to any one of claims 1, 2, 4 or 5, wherein: the packing sealing mechanism comprises a packing box (9), an outer packing (10) and an inner packing (11), the packing box (9) is fixed between the valve body (1) and the valve rod (3) through a limiting piece (8) and a connecting disc (14), the outer packing (10) is arranged between the packing box (9) and the valve body (1), and the inner packing (11) is arranged between the packing box (9) and the valve rod (3).
7. A piston effect self-sealing ball valve as claimed in claim 6, wherein: the cross section of the stuffing box (9) is of a convex structure, the upper end of the stuffing box (9) is located in a groove formed in the connecting disc (14), a notch matched with the limiting part (8) is arranged on one side of the lower end of the stuffing box (9), the outer stuffing (10) is located between the upper end of the stuffing box (9) and the valve body (1), and the inner stuffing (11) is located between the lower end of the stuffing box (9) and the valve rod (3).
8. A piston effect self-sealing ball valve as claimed in claim 1, wherein: an upper step surface (17) is arranged in the valve body (1), a clamping groove is formed in the side wall of the upper step surface (17), one side of a limiting part (8) is installed in the clamping groove, and the other side of the limiting part is located between the packing sealing mechanism and the annular boss (15).
9. A piston effect self-sealing ball valve as claimed in claim 1, wherein: the limiting part is a four-open ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921073562.3U CN210153325U (en) | 2019-07-10 | 2019-07-10 | Piston effect self-sealing ball valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921073562.3U CN210153325U (en) | 2019-07-10 | 2019-07-10 | Piston effect self-sealing ball valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210153325U true CN210153325U (en) | 2020-03-17 |
Family
ID=69765774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921073562.3U Active CN210153325U (en) | 2019-07-10 | 2019-07-10 | Piston effect self-sealing ball valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210153325U (en) |
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2019
- 2019-07-10 CN CN201921073562.3U patent/CN210153325U/en active Active
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