CN211010129U - Valve rod sealing mechanism - Google Patents
Valve rod sealing mechanism Download PDFInfo
- Publication number
- CN211010129U CN211010129U CN201921486197.9U CN201921486197U CN211010129U CN 211010129 U CN211010129 U CN 211010129U CN 201921486197 U CN201921486197 U CN 201921486197U CN 211010129 U CN211010129 U CN 211010129U
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- Prior art keywords
- sealing
- sealing device
- valve
- static
- valve rod
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- Expired - Fee Related
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- 238000007789 sealing Methods 0.000 title claims abstract description 172
- 230000003068 static effect Effects 0.000 claims abstract description 45
- 230000000694 effects Effects 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims description 18
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 210000004907 gland Anatomy 0.000 description 12
- 238000005457 optimization Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a valve rod sealing mechanism, including the compensation sealing mechanism who is used for sealed valve rod and valve gap, compensation sealing mechanism includes dynamic seal device and static sealing device, static sealing device is located dynamic seal device's top, the utility model discloses think about ingeniously, rational in infrastructure, dynamic seal device's up end is identical with static sealing device's lower terminal surface and constitutes the axial seal pair to can also make the vice terminal surface of axial seal remain throughout at best encapsulated situation, ensure sealed effect, and this seal structure is whole firm, zero leakage, need not the maintenance, and overall structure is simple, and it is convenient to make, can significantly reduce manufacturing and use cost.
Description
Technical Field
The utility model relates to a sealing mechanism, specific theory relates to a simple structure, need not the maintenance, the valve stem sealing mechanism of zero leakage belongs to valve technical field.
Background
The stop valve, also called stop valve, is a valve which depends on the pressure of valve rod to make the sealing surface of valve clack and sealing surface of valve seat tightly fit to prevent medium circulation and only allow medium one-way circulation.
And traditional stop valve must have certain directionality when making the installation because the stop valve only permits medium unidirectional flow in the use for the structural length of stop valve is greater than the gate valve, receives the influence that fluid resistance is big simultaneously, and the stop valve is when long-term operation, is sealed because of valve rod and gland easily to be destroyed, makes pipeline valve leak outward.
In order to solve the above problems, a stop valve is available in the market, as the patent number: 201510533529.4 discloses a stop valve, which comprises a valve body with an inlet, an outlet and a valve port for medium circulation, a valve rod, a valve cover, a valve flap, a pressure cap and a handwheel, wherein the upper part of the valve body is connected with the lower part of the valve cover in a sealing manner, the valve flap is arranged at the lower end of the valve rod and is arranged in the valve cavity of the valve body and corresponds to the valve port, the upper end of the valve rod passes through the valve cover and the pressure cap and is connected with the handwheel, a filler is arranged between the inner wall of the upper part of the valve cover and the valve rod, the.
The sealing structure of the valve can be used for realizing sealing, but the stuffing box of the sealing structure generates extrusion through the pressing cap or the pressing cover, so that the valve rod is radially held tightly, the gap between the stuffing and the valve rod is reduced to realize sealing, the stuffing is abraded after long-time use, the pretightening force of the stuffing is reduced, the gap between the stuffing and the valve rod is too large, and gas and liquid overflow to generate leakage.
SUMMERY OF THE UTILITY MODEL
The to-be-solved main technical problem of the utility model is to provide a simple structure need not the maintenance, the valve rod sealing mechanism of zero leakage.
In order to solve the technical problem, the utility model provides a following technical scheme:
a valve stem sealing mechanism, characterized by: the valve rod and valve cover compensation sealing mechanism comprises a compensation sealing mechanism used for sealing a valve rod and a valve cover, wherein the compensation sealing mechanism comprises a dynamic sealing device and a static sealing device, and the static sealing device is positioned above the dynamic sealing device.
The following is the utility model discloses to above-mentioned technical scheme's further optimization:
and a compressing assembly used for applying pressure to the dynamic sealing device by the static sealing ring so as to enable the static sealing ring to be tightly attached to the dynamic sealing device is arranged above the static sealing ring.
Further optimization: the lower part of the static sealing device is matched with the upper part of the dynamic sealing device to form an axial sealing pair.
Further optimization: and a shaft shoulder for axially mounting the dynamic sealing device is arranged on the valve rod.
Further optimization: the dynamic sealing device comprises a spring base and an upper cover, and a compensation device used for keeping the end face of the axial sealing pair in the optimal sealing state all the time is connected between the spring base and the upper cover.
Further optimization: the compensation device comprises a spring, the upper end of the spring is abutted against the upper cover, and the lower end of the spring is abutted against the spring base.
Further optimization: and a sealing ring for improving the sealing effect is fixedly arranged above the upper cover and is in contact with the static sealing device.
Further optimization: and the lower end of the spring base is fixedly provided with a rubber sleeve on the inner wall of the dynamic sealing device.
Further optimization: the diameter of the inner hole of the rubber sleeve is smaller than the diameter of the outer circle of the valve rod above the shaft shoulder.
Further optimization: the compressing assembly comprises a pressing cap arranged above the static sealing ring, and the pressing cap is sleeved on the valve rod and is in threaded connection with the upper port of the valve cover.
The above technical scheme is adopted in the utility model, when using, this valve rod sealing mechanism is applicable to the sealing of multiple valve rod, for example: the stop valve comprises a stop valve body, a valve cover, a valve rod, a valve flap, a fluid inlet and a fluid outlet, and the stop valve can be a common stop valve provided as follows.
When the valve rod sealing mechanism is used for sealing a valve rod, firstly, the dynamic sealing device is sleeved on the valve rod and fixedly installed through the shaft shoulder, then, the static sealing device is installed at the lower end of the pressing cap, then, the pressing cap is in threaded connection with the upper port of the valve cover, the static sealing device is tightly matched with the upper end of the dynamic sealing device, and pressure is applied to the dynamic sealing device to form an axial sealing pair, so that sealing is realized.
The above technical scheme is adopted in the utility model, think about ingenious, rational in infrastructure, it is vice that the last terminal surface of dynamic seal device is identical to form the axial seal with quiet sealing device's lower terminal surface to can also make the vice terminal surface of axial seal remain throughout at best encapsulated situation, ensure sealed effect, and this seal structure is whole firm, zero leaks, need not the maintenance, and overall structure is simple, and it is convenient to make, can significantly reduce manufacturing and use cost.
The present invention will be further explained with reference to the drawings and examples.
Drawings
Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a valve rod in embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a dynamic sealing device in embodiment 1 of the present invention;
fig. 4 is a stop valve to which the valve rod sealing mechanism is applied in embodiment 1 of the present invention;
fig. 5 is a schematic structural diagram of the compressing assembly in embodiment 2 of the present invention.
In the figure: 2-static sealing device; 21-static sealing ring; 3-compensation sealing mechanism; 4-a dynamic sealing device; 41-spring base; 42-upper cover; 43-a spring; 44-a rubber sleeve; 45-sealing ring; 5-valve stem; 6-valve cover; 8-a valve body; 9-a valve; 10-pressing a cap; 14-shaft shoulder; 15-a fluid inlet; 16-a fluid outlet; 17-a gland; 18-gland bolts; 19-sealing sleeve.
Detailed Description
Example 1: referring to fig. 1-4, a valve stem sealing mechanism comprises a compensation sealing mechanism 3 for sealing a valve stem 5 and a valve cover 6, wherein the compensation sealing mechanism 3 comprises a dynamic sealing device 4 and a static sealing device 2, and the static sealing device 2 is positioned above the dynamic sealing device 4.
The lower part of the static sealing device 2 is matched with the upper part of the dynamic sealing device 4 to form an axial sealing pair for sealing the valve rod.
The static sealing device 2 is a static sealing ring 21.
And a pressing assembly for applying pressure to the dynamic sealing device 4 by the static sealing ring 21 to enable the static sealing ring 21 to be tightly attached to the dynamic sealing device 4 is arranged above the static sealing ring 21.
By the design, the static sealing ring 21 and the dynamic sealing ring 21 are driven by the pressing component to apply pressure to the dynamic sealing device 4, so that the static sealing ring 21 and the dynamic sealing device 4 are tightly attached to form axial sealing, and further the sealing of the valve rod 5 is realized.
A shaft shoulder 14 for axially mounting the dynamic sealing device 4 is arranged on the valve rod 5 and inside the valve cover 6.
By means of the shoulder 14, the dynamic sealing device 4 can be fixedly mounted on the valve rod 5.
The dynamic sealing device 4 comprises a spring base 41 and an upper cover 42 which are arranged in an up-down symmetrical manner and movably connected, and a compensation device for keeping the axial sealing auxiliary end face in an optimal sealing state all the time is connected between the spring base 41 and the upper cover 42.
By the design, the movable sealing device 4 can be fixedly arranged on the shaft shoulder 14 through the spring base 41, and then the static sealing ring 21 is driven by the pressing component to apply pressure to the movable sealing device 4, so that the static sealing ring 21 is tightly attached to the movable sealing device 4 to form axial sealing, and the auxiliary end face of the axial sealing can be always kept in the best sealing state through the compensation device, so that the sealing effect is ensured.
The compensation device comprises a spring 43, the upper end of the spring 43 is abutted against the upper cover 42, and the lower end of the spring 43 is abutted against the spring base 41.
By the design, the dynamic and static sealing rings 21 can be driven by the pressing component to apply pressure to the dynamic sealing device 4, so that the spring 43 is stressed and compressed, axial sealing is performed through the elasticity of the spring 43, and the sealing effect is improved.
When the static sealing ring 21 wears the dynamic sealing device 4, the wearing gap can be compensated through the elastic force of the spring 43, so that the end face of the axial sealing pair is always kept in the optimal sealing state, and the sealing effect is ensured.
And a sealing ring 45 for improving the sealing effect is fixedly arranged above the upper cover 42, and the static sealing ring 21 is in contact with the sealing ring 45 to improve the sealing effect.
The lower end of the spring base 41 is fixedly provided with a rubber sleeve 44 on the inner wall of the dynamic sealing device 4, and the diameter of an inner hole of the rubber sleeve 44 is smaller than the diameter of an outer circle of the valve rod 5 above the shaft shoulder 14.
By means of the design, the dynamic sealing device 4 can be bound to the valve rod 5 through the rubber sleeve 44, and the dynamic sealing device 4 is fixedly installed through the matching of the shaft shoulder 14, so that the fixing effect is improved.
The compressing assembly comprises a pressing cap 10 arranged above the static sealing ring 21, and the pressing cap 10 is sleeved on the valve rod 5 and is in threaded connection with the upper end opening of the valve cover 6.
The static seal ring 21 is mounted on the pressure cap 10.
By the design, the threaded connection between the cap 10 and the valve cover 6 can drive the static sealing ring 21 to move and contact the sealing ring 45 of the dynamic sealing device 4, and can apply pressure to the dynamic sealing device 4 to enable the spring 43 to be stressed and compressed.
Example 2: as shown in fig. 5, in the above embodiment 1, the compressing assembly may further adopt a structure shown in fig. 5, the compressing assembly includes a gland 17, the gland 17 is sleeved on the valve rod 5, and a static seal ring 21 is installed at a lower end of the valve rod 5, a seal sleeve 19 is sleeved on the upper portion of the gland 17 and outside the valve rod 5, a plurality of gland bolts 18 are movably disposed on the valve cover 6, and one ends of the gland bolts 18, which are far away from the valve cover 6, respectively penetrate through the gland 17 and the seal sleeve 19 and are in threaded connection with nuts.
By the design, the gland 19 can be driven to jack the gland cover 17 to be close to the valve cover 6 by rotating the nut through the threaded connection between the nut and the gland bolt 18, then the gland 17 drives the static sealing ring 21 to move and contact the sealing ring 45 of the dynamic sealing device 4, and the nut is rotated again to apply pressure to the dynamic sealing device 4, so that the spring 43 is compressed under stress, and the axial sealing pair end face is always kept in the best sealing state.
In use, the stem seal mechanism is suitable for sealing a variety of valve stems, for example: the cut-off valve, the regulating valve, the shunt valve, the multi-purpose valve, etc. refer to a common cut-off valve shown in fig. 4, and the whole structure of the existing cut-off valve includes a valve body 8, a valve cover 6, a valve rod 5, a flap 9, a fluid inlet 15 and a fluid outlet 16.
When the valve rod sealing mechanism is used for sealing a valve rod 5, firstly, a movable sealing device 4 is sleeved on the valve rod 5 and fixedly installed on the movable sealing device 4 through a shaft shoulder 14, then, a static sealing device 2 is installed at the lower end of a pressure cap 10, then, the pressure cap 10 is in threaded connection with the upper port of a valve cover 6, the static sealing device 2 is tightly matched with the upper end of the movable sealing device 4, and pressure is applied to the movable sealing device 4 to form an axial sealing pair, so that sealing is realized.
For those skilled in the art, based on the teachings of the present invention, changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.
Claims (10)
1. A valve stem sealing mechanism, characterized by: the sealing device comprises a compensation sealing mechanism (3) used for sealing a valve rod (5) and a valve cover (6), wherein the compensation sealing mechanism (3) comprises a dynamic sealing device (4) and a static sealing device (2), and the static sealing device (2) is positioned above the dynamic sealing device (4).
2. A valve stem seal mechanism as defined in claim 1 wherein: the static sealing device (2) is a static sealing ring (21), and a pressing assembly used for enabling the static sealing ring (21) to apply pressure to the dynamic sealing device (4) to enable the static sealing ring (21) to be tightly attached to the dynamic sealing device (4) is arranged above the static sealing ring (21).
3. A valve stem seal mechanism as defined in claim 2, wherein: the lower part of the static sealing device (2) is matched with the upper part of the dynamic sealing device (4) to form an axial sealing pair.
4. A valve stem seal mechanism as defined in claim 3 wherein: and a shaft shoulder (14) for axially mounting the dynamic sealing device (4) is arranged on the valve rod (5).
5. A valve stem seal mechanism as defined in claim 4 wherein: the dynamic sealing device (4) comprises a spring base (41) and an upper cover (42), and a compensation device used for keeping the axial sealing auxiliary end face in the optimal sealing state all the time is connected between the spring base (41) and the upper cover (42).
6. A valve stem seal mechanism as defined in claim 5 wherein: the compensation device comprises a spring (43), the upper end of the spring (43) is abutted against the upper cover (42), and the lower end of the spring (43) is abutted against the spring base (41).
7. A valve stem seal mechanism as defined in claim 6 wherein: and a sealing ring (45) for improving the sealing effect is fixedly arranged above the upper cover (42), and the sealing ring (45) is in contact with the static sealing device (2).
8. A valve stem seal mechanism as defined in claim 7 wherein: and a rubber sleeve (44) is fixedly arranged at the lower end of the spring base (41) and on the inner wall of the dynamic sealing device (4).
9. A valve stem seal mechanism as defined in claim 8 wherein: the diameter of an inner hole of the rubber sleeve (44) is smaller than the diameter of an outer circle of the valve rod (5) above the shaft shoulder (14) of the valve rod (5).
10. A valve stem seal mechanism as defined in claim 9 wherein: the compressing assembly comprises a pressing cap (10) arranged above the static sealing ring (21), and the pressing cap (10) is sleeved on the valve rod (5) and is in threaded connection with the upper port of the valve cover (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921486197.9U CN211010129U (en) | 2019-09-09 | 2019-09-09 | Valve rod sealing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921486197.9U CN211010129U (en) | 2019-09-09 | 2019-09-09 | Valve rod sealing mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211010129U true CN211010129U (en) | 2020-07-14 |
Family
ID=71507158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921486197.9U Expired - Fee Related CN211010129U (en) | 2019-09-09 | 2019-09-09 | Valve rod sealing mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211010129U (en) |
-
2019
- 2019-09-09 CN CN201921486197.9U patent/CN211010129U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200714 |