CN214466538U - Combined valve rod sealing structure - Google Patents
Combined valve rod sealing structure Download PDFInfo
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- CN214466538U CN214466538U CN202120623091.XU CN202120623091U CN214466538U CN 214466538 U CN214466538 U CN 214466538U CN 202120623091 U CN202120623091 U CN 202120623091U CN 214466538 U CN214466538 U CN 214466538U
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Abstract
The utility model discloses a combination valve rod seal structure, including gland, lip sealing washer, packing seal assembly and isolation component, from last to wearing to be equipped with gland, packing seal assembly, isolation component and lip sealing washer down in proper order between valve rod and the valve body, the isolation component joint is on valve body or valve rod. The utility model has small friction coefficient, small friction loss of the sealing element and long service life of the sealing element; the rotating moment of the valve rod is small, and the manufacturing cost of the driving device can be reduced in the self-control valve; the installation is simple, and the maintenance is free; the lip sealing ring is good in sealing effect under high pressure, the packing sealing assembly makes up the defect that the sealing effect of the lip sealing ring under the low-pressure working condition is not good, the lip sealing ring and the packing sealing assembly work independently and supplement each other, and the packing sealing assembly is suitable for the working conditions of high temperature, low temperature and high and low temperature circulation.
Description
Technical Field
The utility model relates to a seal structure's technical field especially relates to a combination valve rod seal structure.
Background
The valve rod seal is a sealing device which is arranged between a valve body of the valve and an operating valve rod and prevents fluid in the valve from leaking from a gap between the valve body and the valve rod, and the valve rod seal is usually a packing seal or a lip seal. The packing seal compacts the packing by external pressure, eliminates the gap between the valve rod and the valve body to achieve the sealing effect, has the advantages of simple structure, low material price and wide range, can compensate the loss of the sealing element by adjusting the packing gland packing force, and has the defects that the packing is easy to wear because the packing has large packing force and large friction after the material expands under the high-temperature working condition, and the leakage is caused because the packing cannot rebound effectively after the material is cooled and contracted. The lip seal acts on the lip through the pressure of sealed fluid, so that the lip is tightly attached to the valve rod and the valve body to achieve a sealing effect.
The working principle of the packing seal is realized by external pressure, the working principle of the lip seal is realized by the interference of a sealing element per se or energy storage, and the pressure seal is realized by fluid pressure. The two simple sealing combinations interfere with each other, because the external pressure of the filler seal acts on the back of the lip seal, the normal working condition of the lip seal can be damaged, the lip seal is damaged in advance, the lip opening of the lip seal can damage the pressing force of the filler seal, so that the pressing force of the filler seal is insufficient, and the simple combination can not exert the advantages of the two to achieve the effect of prolonging the service life.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a combination valve rod seal structure to solve the problem that above-mentioned prior art exists, make the packing sealed and lip seal can realize the autonomous working, reach the effect that the combination is increased in efficiency.
In order to achieve the above object, the utility model provides a following scheme:
the utility model provides a combination valve rod seal structure, including gland, lip sealing washer, packing seal assembly and isolation component, wear to be equipped with from last to down in proper order between valve rod and the valve body gland the packing seal assembly isolation component with the lip sealing washer, the isolation component joint in on valve body or the valve rod.
Preferably, the lip sealing ring is a flood plug sealing ring, a U-shaped sealing ring or a Y-shaped sealing ring.
Preferably, the isolation element is a metal retainer ring, the valve body or the valve rod is provided with a boss, and the metal retainer ring is clamped on the boss.
Preferably, the packing seal assembly is a V-shaped combination seal, a wedge-shaped combination seal or a packing seal.
Preferably, when the packing seal assembly is a V-shaped combined seal member, the V-shaped combined seal member sequentially comprises a V-shaped pressing block, V-shaped assembling pieces and V-shaped cushion blocks from top to bottom, and the V-shaped assembling pieces are at least continuously provided with two pieces.
Preferably, the V-shaped pressing block and the packing gland are an integral piece and are made of high-hardness material.
Preferably, the V-shaped spacer and the isolation element are one-piece and made of a high hardness material.
Preferably, when the packing seal assembly is a wedge-shaped combined seal member, the wedge-shaped combined seal member comprises two matched wedge-shaped seal rings, and a plurality of annular grooves are formed in the contact surface of the wedge-shaped seal ring and the valve body or the valve rod.
The utility model discloses for prior art gain following technological effect:
the utility model has small friction coefficient, small friction loss of the sealing element and long service life of the sealing element; the rotating moment of the valve rod is small, and the manufacturing cost of the driving device can be reduced in the self-control valve; the installation is simple, and the maintenance is free; the lip sealing ring is good in sealing effect under high pressure, the packing sealing assembly makes up the defect that the sealing effect of the lip sealing ring under the low-pressure working condition is not good, the lip sealing ring and the packing sealing assembly work independently and supplement each other, and the packing sealing assembly is suitable for the working conditions of high temperature, low temperature and high and low temperature circulation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the combined valve rod sealing structure of the present invention;
fig. 2 is a structural schematic view of a second embodiment of the combined valve rod sealing structure of the present invention;
wherein: 100-combined valve rod sealing structure, 1-valve rod, 2-packing gland, 3-valve body, 4-V type pressing block, 5-V type assembly piece, 6-V type cushion block, 7-metal retainer ring, 8-boss, 9-lip sealing ring, 10-fluid medium, 11-wedge sealing ring and 12-ring groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The utility model aims at providing a combination valve rod seal structure to solve the problem that prior art exists, make the packing sealed and the lip is sealed can realize the autonomous working, reach the effect that the combination is increased efficiency.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Example one
As shown in fig. 1: the embodiment provides a combination valve rod seal structure 100, including gland 2, lip sealing washer 9, packing seal assembly and isolating element, wear to be equipped with gland 2, packing seal assembly, isolating element and lip sealing washer 9 from last to down in proper order between valve rod 1 and the valve body 3, the isolating element joint is on valve body 3 or valve rod 1. The packing gland 2 is in threaded connection with the valve rod 1, or the packing gland 2 is compressed by an additional bolt on the valve body 3.
The isolating element is a metal retainer ring 7, a boss 8 is arranged on the valve body 3 or the valve rod 1, the metal retainer ring 7 is connected to the boss 8 in a clamped mode, if the lip sealing ring 9 is provided with a lug, the lug is connected to the boss 8 in a clamped mode, and the lip sealing ring 9 is convenient to compress and fix. Between the packing seal assemblies of the isolation element, the axial force of the packing seal compression is stressed by the metal retainer ring 7 and then transmitted to the valve body 3, so that the packing seal compression force is prevented from being transmitted to the lip seal. When the packing gland 2 compresses the packing seal from the back, the metal retainer ring 7 and the packing gland 2 form acting force and reacting force to compress the packing seal assembly, because the isolation element is arranged between the packing seal assembly and the lip seal ring 9, the axial force compressed by the packing seal assembly is stressed by the metal retainer ring 7 and then transmitted to the groove of the valve body 3, the pressing force of the packing seal assembly can be prevented from being transmitted to the lip seal ring 9, and the lip seal ring 9 is not stressed and cannot be crushed to influence the sealing effect of the lip seal ring 9. Because the lip sealing ring 9 has good high-pressure sealing effect, the acting force of the pressure of the fluid medium 10 transmitted to the packing sealing component is greatly reduced under the high-pressure state, and the radial sealing force required by the packing sealing component is greatly reduced, so that the frictional resistance and the frictional loss of the packing sealing component are reduced, and the service life of the packing sealing component is prolonged. Both can keep independent and complete working conditions, and respectively play the role of the both, thereby achieving the effect of combination and synergy.
Wherein, the lip sealing ring 9 is a flood plug sealing ring, a U-shaped sealing ring or a Y-shaped sealing ring. The lip sealing ring 9 is a main pressure-bearing element of the valve rod sealing system, pretightening force is provided by the elasticity of a lip groove of the lip sealing ring when the system is at low pressure or no pressure, the initial sealing of the system is realized, the lip sealing is realized in self sealing when the system is at high pressure, namely, the system pressure acts on the lip groove of the lip sealing ring 9, the radial sealing pressure is generated to realize the system sealing, and the lip sealing ring 9 has self sealing property, does not need to be compressed by means of external force, has small friction loss and has good high-pressure sealing effect.
The packing seal assembly is a V-shaped combined seal, a wedge-shaped combined seal or a packing seal. When the packing sealing assembly is a V-shaped combined sealing element, the V-shaped combined sealing element sequentially comprises a V-shaped pressing block 4, a V-shaped assembling piece 5 and a V-shaped cushion block 6 from top to bottom, and the V-shaped assembling piece 5 is at least continuously provided with two pieces according to actual needs. The V-shaped pressing block 4 and the packing gland 2, and the V-shaped cushion block 6 and the isolation element can be separated independent elements made of different materials. The V-shaped pressing block 4 and the packing gland 2 can also be an integrated piece and made of high-hardness materials. Alternatively, the V-shaped spacer 6 and the isolation element may be a single piece and made of a high-hardness material, such as a metal material or a high-hardness polymer material, such as nylon, polyetheretherketone, etc. The packing seal assembly is an auxiliary seal of the valve body 3, and the defect that the sealing effect of the lip seal under a low-pressure working condition is poor is overcome; the packing seal assembly is converted into a gap between the sealing element and the valve rod 1 and a gap between the sealing element and the valve body 3 through radial sealing force by means of external axial pressure, and the packing seal assembly has the advantages of simple structure and good sealing effect.
Example two
As shown in fig. 2: the embodiment provides a combination valve rod seal structure 100, with the first different structure of embodiment only lie in, packing seal assembly is wedge combined seal, wedge combined seal includes two wedge sealing washers 11 that match, be provided with a plurality of annular 12 on the contact surface of wedge sealing washer 11 and valve body 3 or valve rod 1, make this contact surface become line contact by the face contact, can realize that the sealing material is bigger to warp under the same effort and fill the local clearance, annular 12 also can cut apart into multichannel sealing with a sealing face, promote sealed effect.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the explanation of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (8)
1. The utility model provides a combination valve rod seal structure which characterized in that: including gland, lip sealing washer, packing seal assembly and isolating element, wear to be equipped with from last to down in proper order between valve rod and the valve body gland the packing seal assembly isolating element with the lip sealing washer, the isolating element joint in on valve body or the valve rod.
2. The combination valve stem seal according to claim 1, wherein: the lip sealing ring is a flooding plug sealing ring, a U-shaped sealing ring or a Y-shaped sealing ring.
3. The combination valve stem seal according to claim 1, wherein: the isolation element is a metal retainer ring, the valve body or the valve rod is provided with a boss, and the metal retainer ring is clamped on the boss.
4. The combination valve stem seal according to claim 1, wherein: the packing seal assembly is a V-shaped combined seal, a wedge-shaped combined seal or a packing seal.
5. The combination valve stem seal according to claim 4, wherein: when the packing sealing assembly is a V-shaped combined sealing element, the V-shaped combined sealing element sequentially comprises a V-shaped pressing block, V-shaped assembling pieces and V-shaped cushion blocks from top to bottom, and the V-shaped assembling pieces are at least continuously provided with two pieces.
6. The combination valve stem seal according to claim 5, wherein: the V-shaped pressing block and the packing gland are integrated and are made of high-hardness materials.
7. The combination valve stem seal according to claim 5, wherein: the V-shaped cushion block and the isolation element are integrated and made of high-hardness materials.
8. The combination valve stem seal according to claim 4, wherein: when the packing seal assembly is a wedge-shaped combined seal element, the wedge-shaped combined seal element comprises two matched wedge-shaped seal rings, and a plurality of annular grooves are formed in the contact surface of the wedge-shaped seal ring and the valve body or the valve rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120623091.XU CN214466538U (en) | 2021-03-29 | 2021-03-29 | Combined valve rod sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120623091.XU CN214466538U (en) | 2021-03-29 | 2021-03-29 | Combined valve rod sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214466538U true CN214466538U (en) | 2021-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120623091.XU Active CN214466538U (en) | 2021-03-29 | 2021-03-29 | Combined valve rod sealing structure |
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| CN (1) | CN214466538U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562567A (en) * | 2022-03-16 | 2022-05-31 | 中国原子能科学研究院 | Valve device |
-
2021
- 2021-03-29 CN CN202120623091.XU patent/CN214466538U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562567A (en) * | 2022-03-16 | 2022-05-31 | 中国原子能科学研究院 | Valve device |
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