CN212960158U - Self-compensating and forced sealing valve rod sealing structure - Google Patents
Self-compensating and forced sealing valve rod sealing structure Download PDFInfo
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- CN212960158U CN212960158U CN202021663675.1U CN202021663675U CN212960158U CN 212960158 U CN212960158 U CN 212960158U CN 202021663675 U CN202021663675 U CN 202021663675U CN 212960158 U CN212960158 U CN 212960158U
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Abstract
The utility model discloses a valve rod sealing structure with self-compensation and forced sealing, which comprises an upper valve seat, a valve cover and a filler, wherein the upper valve seat and the valve cover are sleeved on a valve rod of a valve, a filler box is arranged on the inner hole surface of the upper valve seat, and the filler is arranged in the filler box; the self-sealing ring is sleeved on the valve rod and is in sealing fit with the upper valve seat and the valve rod, and the top end of the self-sealing ring is abutted against the bottom surface of the filler; the combining cap is sleeved on the self-sealing ring and is in sealing fit with the upper valve seat and the self-sealing ring; the disc spring is arranged between the top surface of the parallel cap and the bottom surface of the self-sealing ring; two ends of the disc spring are respectively propped against the top surface of the nut and the bottom surface of the self-sealing ring. The utility model is provided with the self-sealing ring, the top end of the self-sealing ring is propped against the plane of the filler, and when the pressure in the valve is higher or leakage occurs, forced sealing can be realized; the dish spring sets up and between cap and the self-sealing ring, can improve the leakproofness and the stability of valve rod through the leakproofness of the spring prestressing force automatic compensation packing of dish spring.
Description
Technical Field
The utility model relates to a valve rod seal field, concretely relates to self compensating and forced sealing's valve rod seal structure.
Background
The valve rod is an important part for driving the opening and closing piece to open and close the valve, and is the most easily-leaked part because the valve rod is a movable piece. Therefore, valve stem sealing is very important for valves. The sealing of the valve stem is usually by means of a compressed packing. The compression packing is soft material which is pressed into the stuffing box to seal the periphery of the valve rod, and the packing can seal the medium if the pressure of the packing acting on the transverse supporting surface is equal to or higher than the pressure of the medium and is enough to close the leakage groove on the transverse surface.
However, in the process of opening and closing the valve rod, along with the increase of the opening and closing times, the abrasion of the packing is aggravated, and the sealing performance of the valve rod can be greatly influenced. In addition, when the pressure of the valve exceeds the daily pressure, the filler is easy to leak, and danger is easy to cause.
Therefore, the chinese invention patent CN108278378A provides an upper valve seat driven forced sealing ball valve, which includes a valve body, a first upper valve seat, a ball valve, and a valve rod, wherein the valve rod drives the valve ball to rotate back and forth between the open and closed positions, and the valve rod also drives the first upper valve seat to move back and forth towards the ball valve, and when the valve ball is closed, the valve rod is clasped with the valve ball to realize forced sealing. The first upper valve seat is driven by a first upper valve seat driving ring to reciprocate towards the valve ball direction, the first upper valve seat driving ring is provided with internal threads, the first upper valve seat is provided with external threads, and the first upper valve seat driving ring drives the first upper valve seat to reciprocate towards the valve ball direction through threaded connection. The utility model discloses a, the adoption is gone up the valve seat moving means and is realized the forced seal of ball valve, through the relation of connection between locking body control valve rod and valve ball and the first valve seat of going up, to a certain extent the leakproofness of ball valve. However, the above-mentioned positive seal ball valve has the following disadvantages:
(1) the problem that the sealing performance of the valve rod is reduced due to the fact that the abrasion of the packing is aggravated along with the increase of the opening and closing times of the valve rod cannot be solved;
(2) the structure is complicated to only be applicable to the ball valve structure, do not have the commonality to other types of valves, manufacturing cost is high.
In view of this, it is necessary to improve the existing valve rod sealing structure to solve the problems of the valve rod sealing performance reduction caused by the increase of the opening and closing times of the valve rod and the abrasion of the packing, and to reduce the production cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the valve rod leakproofness that present valve rod leakproofness structure can not solve the valve rod and open and close the problem that the number of times increases, the packing wearing and tearing lead to reduce to and valve rod seal structure is complicated, problem that manufacturing cost is high.
In order to solve the technical problem, the utility model provides a self compensating and forced sealed valve rod seal structure, including last disk seat, valve gap and filler, go up the disk seat with the valve gap cover is established on the valve rod of valve, and the hole face of going up the disk seat is equipped with the packing groove, the filler sets up in the packing groove, still include:
the self-sealing ring is sleeved on the valve rod, is in sealing fit with the upper valve seat and the valve rod at the same time, and the top end of the self-sealing ring is abutted against the bottom surface of the filler;
the combining cap is sleeved on the self-sealing ring and is in sealing fit with the upper valve seat and the self-sealing ring;
the disc spring is arranged between the top surface of the combined cap and the bottom surface of the self-sealing ring; and two ends of the disc spring are respectively abutted against the top surface of the combining cap and the bottom surface of the self-sealing ring.
In the scheme, the self-sealing ring sequentially comprises a first ring body, a second ring body and a third ring body from top to bottom, the inner diameters of the first ring body, the second ring body and the third ring body are the same, the inner hole surfaces of the first ring body, the second ring body and the third ring body are communicated, the outer diameter of the second ring body is larger than that of the first ring body and that of the third ring body, and the nut is sleeved on the third ring body; and the inner hole surface of the upper valve seat is provided with a limiting platform which is opposite to the top surface of the second ring body.
In this scheme, be equipped with the seal groove on the second ring body, be equipped with O type circle in the seal groove.
In this scheme, the bottom of the interior hole face of third ring body is equipped with interior inclined plane, be equipped with outer inclined plane on the valve rod, with interior inclined plane looks adaptation.
In this scheme, the valve gap with the top of going up the disk seat is equipped with the bolt hole, the valve gap with go up the disk seat and pass through the bolt fastening.
In this scheme, be equipped with the external screw thread on the outer fringe face of and cap, be equipped with the internal thread on the hole face of going up the disk seat, with external screw thread looks adaptation.
In the scheme, the internal thread and the external thread are coated with molybdenum disulfide.
Compared with the prior art, the utility model provides a self-compensating and forced sealing valve rod sealing structure, which is provided with a self-sealing ring, the top end of the self-sealing ring is propped against the plane of the packing, when the pressure in the valve is higher or leakage occurs, the forced sealing can be realized; the dish spring sets up and between cap and the self-sealing ring, can improve the leakproofness and the stability of valve rod through the leakproofness of the spring prestressing force automatic compensation packing of dish spring.
Drawings
FIG. 1 is a structural exploded view of the valve stem seal structure of the present invention;
fig. 2 and 3 are sectional views of the valve stem sealing structure of the present invention.
The correspondence between the names and reference numbers of the components in fig. 1 and 2 is as follows:
the valve comprises a valve rod 1, an upper valve seat 2, a valve cover 3, a packing 4, a self-sealing ring 5, a cap 6, a disc spring 7, a packing box 21, a first ring body 51, a second ring body 52, a third ring body 53, a limiting table 22, an O-shaped ring 521, an inner inclined plane 531 and an outer inclined plane 11.
Detailed Description
The utility model provides a self-compensating and forced sealing valve rod sealing structure, which is characterized in that the top end of the self-sealing ring is abutted against the plane of the filler, and forced sealing can be realized when the pressure in the valve is higher or leakage occurs; the dish spring sets up and between cap and the self-sealing ring, can improve the leakproofness and the stability of valve rod through the leakproofness of the spring prestressing force automatic compensation packing of dish spring. The invention is described in detail below with reference to the drawings and the detailed description.
As shown in fig. 1, fig. 2 and fig. 3, the present invention provides a self-compensating and forced sealing valve rod sealing structure, which comprises a valve rod 1, an upper valve seat 2, a valve cover 3, a packing 4, a self-sealing ring 5, a union cap 6 and a disc spring 7. The upper valve seat 2 and the valve cover 3 are sleeved on the valve rod 1, a stuffing box 21 is arranged on the inner hole surface of the upper valve seat 2, and the stuffing 4 is arranged in the stuffing box 21. The valve cover 3 and the upper valve seat 2 are provided with bolt holes, and the valve cover 3 and the upper valve seat 2 are fixed through bolts.
The self-sealing ring 5 is sleeved on the valve rod 1 and sequentially comprises a first ring body 51, a second ring body 52 and a third ring body 53 from top to bottom, the inner diameters of the first ring body 51, the second ring body 52 and the third ring body 53 are the same, and the inner hole surfaces of the first ring body 51, the second ring body 52 and the third ring body 53 are communicated. The second ring 52 has an outer diameter greater than the outer diameters of the first and third rings 51, 53. The inner hole surface of the upper valve seat 2 is provided with a limit table 22, the top end of the first ring body 51 is abutted against the bottom end of the packing 4, and the top surface of the second ring body 52 is arranged opposite to the limit table 22. The inner hole surfaces of the first ring body 51, the second ring body 52 and the third ring body 53 are in sealing fit with the valve rod 1, and the outer edge surfaces of the first ring body 51 and the second ring body 52 are in sealing fit with the upper valve seat 2. A sealing groove is formed in the outer edge surface of the second ring body 52, and an O-ring 521 is arranged in the sealing groove. The bottom end of the inner hole surface of the third ring body 53 is provided with an inner inclined surface 531, the valve rod 1 is provided with an outer inclined surface 11, and the inner inclined surface 531 is matched with the outer inclined surface 11.
And the cap 6 is sleeved on the self-sealing ring 5 and is in sealing fit with the upper valve seat 2 and the self-sealing ring 5. And the outer edge surface of the cap 6 is provided with an external thread, the inner hole surface of the upper valve seat 2 is provided with an internal thread, the external thread and the internal thread are coated with molybdenum disulfide which are matched with each other, and the cap 6 is arranged on the upper valve seat 2 and the self-sealing ring 5. And the inner hole surface of the cap 6 is arranged opposite to the third ring body 53 and is in sealing fit with the third ring body, and the top surface of the cap 6 is arranged opposite to the bottom surface of the second ring body 52.
The disc spring 7 is arranged between the top surface of the combining cap 6 and the bottom surface of the second ring body 52 on the self-sealing ring 5, and two ends of the disc spring respectively abut against the top surface of the combining cap 6 and the bottom surface of the second ring body 52.
The working process of the utility model is as follows:
(1) and (6) mounting.
After the O-ring 521 is mounted on the seal ring 5 and coated with grease, the self-seal ring 5 and the disc spring 7 are sequentially loaded into the stuffing box 21, and the nut 6 is screwed into the stuffing box 21. The valve rod 1 is sleeved into the upper valve seat 2, and after the filler 4 is filled, the valve cover 3 and the upper valve seat 2 are fixed through bolts.
(2) Forced sealing in daily operation.
The third ring body 53 on the self-sealing ring 5 is simultaneously in sealing fit with the valve rod 1 and the combining cap 6, the combining cap 6 is in sealing fit with the upper valve seat 2, and when the pressure in the valve is increased, the pressure in the valve pushes the third ring body 53 to move upwards and tightly press the packing 4, so that forced sealing is realized.
(3) And (6) automatic compensation.
After the valve rod 1 performs valve opening and closing movement for a long time, the sealing performance of the filler 4 is gradually reduced or even loses efficacy, the disc spring 7 pushes the second ring body 52 through the pretightening force of the disc spring, so that the self-sealing ring 5 moves upwards to extrude the filler 4, and the sealing performance of the filler 4 losing efficacy is compensated.
(4) Emergency forced sealing in case of leakage.
When the valve rod 1 leaks, the valve rod 1 is manually pulled upwards, the valve rod 1 drives the self-sealing ring 5 to move upwards through the outer inclined surface 11 and the inner inclined surface 531, and the second ring body 52 and the limiting table 22 are forced to be sealed.
Compared with the prior art, the utility model provides a valve rod sealing structure has following function:
(1) the automatic compensation of the sealing performance of the packing is realized through the disk spring arranged between the self-sealing ring and the combining cap, and after the valve rod performs valve opening and closing movement for a long time, once the sealing performance of the sealing packing is reduced or fails, the sealing performance of the packing is automatically compensated through the spring pretightening force of the disk spring, so that a reliable upper sealing structure can be quickly and automatically reestablished.
(2) The self-sealing ring sets up on the top of packing, and the top of self-sealing ring offsets with the bottom of packing, and when valve body internal pressure increased, valve internal pressure promoted self-sealing ring rebound, compressed tightly the packing, can realize forcing to seal to valve internal pressure is higher, and the sealed effect of valve rod is better.
(3) When the valve rod leaks, the valve rod is moved upwards to drive the self-sealing valve to press the packing part, so that the considered forced seal can be opened, and the valve rod and the packing can be sealed.
The three functions can effectively guarantee the sealing performance of the valve rod, and the valve rod sealing structure is applied to valves with lifting valve rod sealing structures, such as stop valves, gate valves, regulating valves, throttling valves and the like, so that the valve rod sealing of the valves is more reliable and safer.
In this scheme, the bottom of the interior hole face of third ring body is equipped with interior inclined plane, is equipped with the outer inclined plane with interior inclined plane looks adaptation on the valve rod, has increased the area of contact of valve gap with the self-sealing ring, has improved the sealed effect of self-sealing ring with the valve gap.
In this scheme to be equipped with the external screw thread on the outer fringe face of cap, be equipped with the internal thread on going up the hole face of disk seat, scribble molybdenum disulfide on external screw thread and the internal thread, play the lubrication action, prevent that internal thread and external screw thread from stinging to die.
The present invention is not limited to the above-mentioned best mode, and any person should learn the structural change made under the teaching of the present invention, all with the present invention has the same or similar technical solution, all fall into the protection scope of the present invention.
Claims (7)
1. The utility model provides a self compensating and forced sealed valve rod seal structure, includes disk seat, valve gap and filler, go up the disk seat with the valve gap cover is established on the valve rod of valve, and the hole face of going up the disk seat is equipped with the packing groove, the filler sets up in the packing groove, its characterized in that still includes:
the self-sealing ring is sleeved on the valve rod, is in sealing fit with the upper valve seat and the valve rod at the same time, and the top end of the self-sealing ring is abutted against the bottom surface of the filler;
the combining cap is sleeved on the self-sealing ring and is in sealing fit with the upper valve seat and the self-sealing ring;
the disc spring is arranged between the top surface of the combined cap and the bottom surface of the self-sealing ring; and two ends of the disc spring are respectively abutted against the top surface of the combining cap and the bottom surface of the self-sealing ring.
2. The valve rod sealing structure according to claim 1, wherein the self-sealing ring comprises a first ring body, a second ring body and a third ring body in sequence from top to bottom, the first ring body, the second ring body and the third ring body have the same inner diameter, the inner hole surfaces of the first ring body, the second ring body and the third ring body are communicated, the outer diameter of the second ring body is larger than that of the first ring body and that of the third ring body, and the nut is sleeved on the third ring body; and the inner hole surface of the upper valve seat is provided with a limiting platform which is opposite to the top surface of the second ring body.
3. The valve stem sealing structure of claim 2, wherein the second ring body is provided with a sealing groove, and an O-ring is arranged in the sealing groove.
4. The valve stem sealing structure according to claim 2, wherein the bottom end of the inner hole surface of the third ring body is provided with an inner inclined surface, and the valve stem is provided with an outer inclined surface adapted to the inner inclined surface.
5. The valve stem sealing structure according to claim 1, wherein bolt holes are provided on the valve cover and the upper valve seat, and the valve cover and the upper valve seat are fixed by bolts.
6. The valve rod sealing structure according to claim 1, wherein an external thread is arranged on the outer edge surface of the combining cap, and an internal thread is arranged on the inner hole surface of the upper valve seat and is matched with the external thread.
7. The valve stem sealing structure of claim 6, wherein the internal thread and the external thread are coated with molybdenum disulfide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021663675.1U CN212960158U (en) | 2020-08-11 | 2020-08-11 | Self-compensating and forced sealing valve rod sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021663675.1U CN212960158U (en) | 2020-08-11 | 2020-08-11 | Self-compensating and forced sealing valve rod sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212960158U true CN212960158U (en) | 2021-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021663675.1U Active CN212960158U (en) | 2020-08-11 | 2020-08-11 | Self-compensating and forced sealing valve rod sealing structure |
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| Country | Link |
|---|---|
| CN (1) | CN212960158U (en) |
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2020
- 2020-08-11 CN CN202021663675.1U patent/CN212960158U/en active Active
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