CN212004530U - Valve self-sealing structure - Google Patents
Valve self-sealing structure Download PDFInfo
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- CN212004530U CN212004530U CN202020484179.3U CN202020484179U CN212004530U CN 212004530 U CN212004530 U CN 212004530U CN 202020484179 U CN202020484179 U CN 202020484179U CN 212004530 U CN212004530 U CN 212004530U
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Abstract
The utility model discloses a valve self sealss structure, establish the valve body of valve rod in including, still be equipped with in the valve body with valve rod sealing connection's unsteady valve gap. The valve rod is sleeved with a packing pressing plate, and a first pre-tightening bolt penetrates through the packing pressing plate. The lower end of the first pre-tightening bolt is in threaded connection with the floating valve cover, and the upper end of the first pre-tightening bolt is in threaded connection with a first nut. And a sealing ring capable of sealing with the inner wall of the valve body is integrally arranged on the side wall of the lower end of the floating valve cover. The valve body is also internally provided with a gland fixedly connected with the valve body, and four open rings and a backing ring are sequentially pressed below the gland. The lower end of the backing ring is pressed on the sealing ring. The utility model discloses a valve self sealss structure is simple structure not only, and certain high-pressure space has been saved to convenient to detach, and sealing performance is more reliable moreover.
Description
Technical Field
The utility model relates to the technical field of valves, especially, relate to a valve self sealss structure.
Background
At present, a valve self-sealing structure is mainly sealed by a wedge-shaped sealing ring made of soft metal, as shown in fig. 1, the wedge-shaped sealing ring 1' is placed between a floating valve cover 2' and a valve body 3', and a pre-tightening bolt 4' is screwed down, so that the side surfaces of the wedge-shaped sealing ring 1' are respectively attached to the floating valve cover 2' and the valve body 3' to form sealing pre-tightening force. When a medium passes through the valve, medium pressure acts on the floating valve cover 2', and the floating valve cover 2' upwards compresses the wedge-shaped sealing ring 1', so that the wedge-shaped sealing ring 1' is more compressed and squeezed, and the self-tightening sealing effect is achieved. The wedge-shaped sealing ring is difficult to disassemble and needs to occupy a certain high-pressure space, two sealing surfaces (which are respectively sealed with the floating valve cover and the inner wall of the valve body) are arranged on the wedge-shaped sealing ring, and when the pressure of a medium in the valve changes repeatedly, the risk of leakage is high.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects, the utility model aims to provide a valve self-sealing structure, simple structure, convenient disassembly saves certain high-pressure space, and sealing performance is more reliable.
In order to achieve the above purpose, the utility model discloses a technical scheme is: the utility model provides a valve self sealss structure, establishes the valve body of valve rod in including, still be equipped with in the valve body with valve rod sealing connection's floating valve gap. The valve rod is sleeved with a packing pressing plate, and a first pre-tightening bolt penetrates through the packing pressing plate. The lower end of the first pre-tightening bolt is in threaded connection with the floating valve cover, and the upper end of the first pre-tightening bolt is in threaded connection with a first nut. And a sealing ring capable of sealing with the inner wall of the valve body is integrally arranged on the side wall of the lower end of the floating valve cover. The valve body is also internally provided with a gland fixedly connected with the valve body, and four open rings and a backing ring are sequentially pressed below the gland. The lower end of the backing ring is pressed on the sealing ring.
The floating valve cover can generate sealing pretightening force through a pretightening bolt arranged on the packing press plate; during operation, the nut is rotated to enable the first pre-tightening bolt to ascend along the packing pressing plate, the floating valve cover can be driven to ascend synchronously through threaded connection of the lower end of the first pre-tightening bolt and the floating valve cover, at the moment, the sealing ring integrally formed with the floating valve cover ascends along with the first pre-tightening bolt, and due to the fact that the gland, the four-way ring and the backing ring are sequentially pressed, the sealing ring can deform to be pressed on the inner wall of the valve body in the ascending process of the sealing ring, and self-sealing pre-tightening of the valve; during operation, because medium pressure is acted on the floating valve cover, the floating valve cover and the sealing ring have the trend of moving upwards, and the backing ring of crimping on the sealing ring enables the sealing ring to compress tightly on the valve body inner wall more this moment to reach the effect of self-tightening sealing.
The beneficial effects of the utility model reside in that: through the sealing ring with unsteady valve gap integrated into one piece, not only simplified the valve self sealss structure, saved certain high-pressure space, through the unsteady valve gap and the sealing ring of integrative setting, removed the sealed face between sealing ring and the unsteady valve gap moreover, only remain the sealed face between sealing ring and the valve body, and then reduced the probability that the valve body took place to leak for the sealing performance of valve body is more reliable.
Further, the sealing ring comprises an elastic ring body, a rigid sealing part used for being in sealing contact with the inner wall of the valve body is welded on the outer wall of the elastic ring body in a surfacing mode, and the upper end of the elastic ring body is in a downward inclined state from the outer ring to the inner ring. The deformation of sealing ring has been realized through the setting of elasticity ring body, has guaranteed through the rigid seal portion that matches with the valve body inner wall that when the deformation takes place for the elasticity ring body, the rigid seal portion can seal and press to the valve body inner wall on, guarantee to press the homogeneity of dynamics.
Furthermore, the backing ring is provided with a wedge-shaped structure which can be pressed against the upper end of the elastic ring body. The elastic ring body can be tensioned more through the arrangement of the wedge-shaped structure, so that the sealing strength between the rigid sealing part and the inner wall of the valve body is better.
Further, a second pre-tightening bolt penetrates through the pressure cover. The lower end of the second pre-tightening bolt is in threaded connection with the floating valve cover, and the upper end of the second pre-tightening bolt is in threaded connection with a second nut. The second pre-tightening bolt and the first pre-tightening bolt are respectively positioned on two sides of the valve rod. The setting through No. two pretension bolts can cooperate the sealed pretightning force of a number of pretension bolts regulation floating valve gap.
Furthermore, an annular groove used for limiting the position of the four open rings is further formed in the valve body, and one end of each four open ring is embedded into the annular groove.
Further, the valve body is further provided with a valve support fixedly connected with the valve body, and the inner side of the valve support is tightly pressed at the upper end of the gland. The upward movement of the gland can be restrained by the valve bracket pressed on the gland.
Further, a packing cavity for packing is further arranged between the floating valve cover and the valve rod, and a pressing sleeve for pressing the packing is arranged at the lower end of the packing pressing plate. The sealing between the valve rod and the floating valve cover is realized through the matching of the packing pressing plate, the pressing sleeve and the packing.
Drawings
FIG. 1 is a schematic diagram of a prior art structure in the background art;
fig. 2 is a schematic structural diagram of an embodiment of the present invention;
FIG. 3 is a partial enlarged view of portion A of FIG. 2;
fig. 4 is a schematic structural view of a floating valve cover according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a backing ring according to an embodiment of the present invention.
In the figure:
1' -a wedge-shaped sealing ring; 2' -a floating valve cover; 3' -a valve body; 4' -pre-tightening the bolt; 1-a valve body; 2-a valve stem; 3-floating valve cover; 31-a sealing ring; 311-an elastic ring body; 312-a rigid seal; 4-a packing press plate; 41-a pre-tightening bolt; 42-pressing the sleeve; 5-pressing the cover; 51-second pre-tightening bolt; 6-four open loop; 7-a backing ring; 71-a wedge-shaped structure; 8-a valve holder; 9-packing chamber.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.
Examples
Referring to the attached drawings 2-3, the utility model discloses a valve self-sealing structure, including establishing the valve body 1 of valve rod 2 in, still be equipped with in the valve body 1 with valve rod 2 sealing connection's floating valve gap 3. The valve rod 2 is sleeved with a packing pressing plate 4, and a first pre-tightening bolt 41 penetrates through the packing pressing plate 4. The lower end of the first pre-tightening bolt 41 is in threaded connection with the floating valve cover 3, and the upper end of the first pre-tightening bolt is in threaded connection with a first nut. And a sealing ring 31 capable of sealing with the inner wall of the valve body 1 is integrally arranged on the side wall of the lower end of the floating valve cover 3. The valve body 1 is also internally provided with a gland 5 fixedly connected with the valve body, and a four-open ring 6 and a backing ring 7 are sequentially pressed below the gland 5. The lower end of the backing ring 7 is crimped onto the sealing ring 31.
A first pre-tightening bolt 41 arranged on the packing press plate 4 can generate sealing pre-tightening force on the floating valve cover 3; during operation, the first pre-tightening bolt 41 is lifted along the packing pressing plate 4 by rotating the nut, the floating valve cover 3 can be driven to synchronously lift through the threaded connection of the lower end of the first pre-tightening bolt 41 and the floating valve cover 3, at the moment, the sealing ring 31 integrally formed with the floating valve cover 3 lifts along with the lifting, and due to the sequential crimping of the gland 5, the four-open ring 6 and the backing ring 7, the sealing ring 31 can deform to be pressed on the inner wall of the valve body 1 in the lifting process of the sealing ring 31, so that the self-sealing pre-tightening of the valve body 1 is realized; during operation, because medium pressure acts on the floating valve cover 3, the floating valve cover 3 and the sealing ring 31 have the tendency of moving upwards, and the backing ring 7 pressed on the sealing ring 31 at the moment enables the sealing ring 31 to be pressed on the inner wall of the valve body 1, so that the self-tightening sealing effect is achieved. Through the sealing ring 31 with 3 integrated into one piece of valve gap that floats, not only simplified the valve self-sealing structure, saved certain high-pressure space, floating valve gap 3 and the sealing ring 31 through integrative setting have moreover removed the sealed face between sealing ring 31 and the floating valve gap 3, only remain the sealed face between sealing ring 31 and the valve body 1 (be equivalent to only remaining a leakage point), and then reduced the probability that valve body 1 took place to leak for the sealing performance of valve body 1 is more reliable.
Referring to fig. 4, the sealing ring 31 includes an elastic ring body 311, a rigid sealing portion 312 for sealing and contacting the inner wall of the valve body 1 is welded on the outer wall of the elastic ring body 311, and the upper end of the elastic ring body 311 is inclined downward from the outer ring to the inner ring. The elastic ring body 311 is made of soft metal, and the rigid sealing part 312 is made of hard metal. When the sealing ring 31 moves upward, the elastic ring 311 can press against the backing ring 7 to deform, and further press against the rigid sealing part 312, so that the rigid sealing part 312 and the inner wall of the valve body 1 are sealed. The deformation of the sealing ring 31 is realized through the arrangement of the elastic ring body 311, and the rigid sealing part 312 matched with the inner wall of the valve body 1 ensures that the rigid sealing part 312 can be pressed on the inner wall of the valve body 1 in a sealing manner when the elastic ring body 311 deforms, so that the uniformity of the pressing force is ensured.
In this embodiment, referring to fig. 5, the backing ring 7 is provided with a wedge-shaped structure 71 capable of pressing against the upper end of the elastic ring 311. When the sealing ring 31 is pressed against the backing ring 7, the elastic ring 311 is further expanded by the wedge structure 71, so that the sealing strength between the rigid sealing part 312 and the inner wall of the valve body 1 is better.
In this embodiment, a second pre-tightening bolt 51 is inserted into the gland 5. The lower end of the second pre-tightening bolt 51 is in threaded connection with the floating valve cover 3, and the upper end of the second pre-tightening bolt is in threaded connection with a second nut. The second pre-tightening bolt 51 and the first pre-tightening bolt 41 are respectively positioned on two sides of the valve rod 2. The sealing pretightening force of the floating valve cover 3 can be adjusted by the arrangement of the second pretightening bolt 51 in cooperation with the first pretightening bolt 41.
In this embodiment, an annular groove for limiting the position of the four open rings 6 is further arranged in the valve body 1, and one end of the four open rings 6 is embedded in the annular groove.
In this embodiment, the valve body 1 is further provided with a valve support 8 fixedly connected with the valve body 1, the valve support 8 is fixedly connected with the valve body 1 through a bolt, and the inner side of the bottom end of the valve support is pressed on the upper end of the gland 5. The upward movement of the gland 5 when the floating valve cover 3 moves can be suppressed by the valve holder 8 pressed against the gland 5.
The sealing connection structure of the floating valve cover 3 and the valve rod 2 is as follows: a packing cavity 9 for packing is further arranged between the floating valve cover 3 and the valve rod, and a pressing sleeve 42 for pressing the packing is arranged at the lower end of the packing pressing plate 4. During assembly, the packing pressing plate 4 and the pressing sleeve 42 are sleeved on the valve rod 2, the packing pressing plate 4 is pressed down on the pressing sleeve 42, the pressing sleeve 42 is forced to press the packing in the packing cavity 9, and at the moment, the packing is stressed and tensioned to realize sealing between the valve rod 2 and the floating valve cover 3; when the floating valve cover 3 is forced to move upwards, the packing pressing plate 4 and the pressing sleeve 42 are kept still, and at the moment, the packing is tightened again to improve the sealing performance between the valve rod 2 and the floating valve cover 3.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.
Claims (7)
1. A valve self-sealing structure comprises a valve body with a valve rod arranged inside, and a floating valve cover connected with the valve rod in a sealing manner is further arranged inside the valve body; the method is characterized in that: the valve rod is sleeved with a packing pressing plate, and a first pre-tightening bolt penetrates through the packing pressing plate; the lower end of the first pre-tightening bolt is in threaded connection with the floating valve cover, and the upper end of the first pre-tightening bolt is in threaded connection with a first nut; a sealing ring capable of sealing with the inner wall of the valve body is integrally arranged on the side wall of the lower end of the floating valve cover; a gland fixedly connected with the valve body is further arranged in the valve body, and four open rings and a backing ring are sequentially pressed below the gland; the lower end of the backing ring is pressed on the sealing ring.
2. A valve self-sealing structure as claimed in claim 1, wherein: the sealing ring comprises an elastic ring body, a rigid sealing part for sealing contact with the inner wall of the valve body is formed in the outer wall of the elastic ring body in a build-up welding mode, and the upper end of the elastic ring body is in a downward inclined state from the outer ring to the inner ring.
3. A valve self-sealing structure as claimed in claim 2, wherein: the backing ring is provided with a wedge-shaped structure which can be pressed against the upper end of the elastic ring body.
4. A valve self-sealing structure as claimed in any one of claims 1 to 3, wherein: a second pre-tightening bolt penetrates through the pressure cover; the lower end of the second pre-tightening bolt is in threaded connection with the floating valve cover, and the upper end of the second pre-tightening bolt is in threaded connection with a second nut; the second pre-tightening bolt and the first pre-tightening bolt are respectively positioned on two sides of the valve rod.
5. The valve self-sealing structure of claim 4, wherein: the valve body is also internally provided with an annular groove for limiting the position of the four open rings, and one end of each of the four open rings is embedded in the annular groove.
6. A valve self-sealing structure as claimed in claim 1, wherein: the valve body is also provided with a valve bracket fixedly connected with the valve body, and the inner side of the valve bracket is pressed at the upper end of the gland.
7. A valve self-sealing structure as claimed in claim 1, wherein: a packing cavity for packing is further arranged between the floating valve cover and the valve rod, and a pressing sleeve for pressing the packing is arranged at the lower end of the packing pressing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020484179.3U CN212004530U (en) | 2020-04-02 | 2020-04-02 | Valve self-sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020484179.3U CN212004530U (en) | 2020-04-02 | 2020-04-02 | Valve self-sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212004530U true CN212004530U (en) | 2020-11-24 |
Family
ID=73403757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020484179.3U Active CN212004530U (en) | 2020-04-02 | 2020-04-02 | Valve self-sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212004530U (en) |
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2020
- 2020-04-02 CN CN202020484179.3U patent/CN212004530U/en active Active
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