CN211010130U - Upper sealing structure of low-temperature valve stuffing box - Google Patents
Upper sealing structure of low-temperature valve stuffing box Download PDFInfo
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- CN211010130U CN211010130U CN201922156739.2U CN201922156739U CN211010130U CN 211010130 U CN211010130 U CN 211010130U CN 201922156739 U CN201922156739 U CN 201922156739U CN 211010130 U CN211010130 U CN 211010130U
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- packing
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- filler
- nut
- clamping ring
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Abstract
The utility model provides a low temperature valve packing box upper portion seal structure, which comprises a valve rod, the packing is pressed the cover, first O type circle, second O type circle, packing is pressed the cover below and is equipped with first filler, first clamping ring compresses tightly first filler, first clamping ring below coupling spring, the other end of spring even has the second clamping ring, the second clamping ring compresses tightly the second filler, second filler below is equipped with the junk ring, the packing is pressed the cover outside and is equipped with the packing box, it has L shape draw-in groove and with the junk ring chucking to open on it, first filler, first clamping ring, the second filler, the spring all is pressing the cover at the packing, the valve rod lateral wall, in the space that junk ring and packing box enclose, the packing box has packing nut and lock nut through threaded connection, packing nut is located lock nut top and packing nut and valve rod and packing press the cover to hug closely.
Description
Technical Field
The utility model relates to a mechanical valve technical field especially relates to a low temperature valve packing box upper portion seal structure.
Background
In the prior art, generally, a non-metallic material suitable for an ultra-low temperature environment is adopted, the self elasticity of a filler is utilized for sealing, the defects that after the non-metallic material is used for a period of time, the pretightening force originally applied to the filler is reduced along with the weakening of the elasticity of the filler, and the contraction combined action of the material in the low temperature environment causes the gap between the filler and a filler box as well as a valve rod to be enlarged, so that the sealing effect is reduced, the existing disposal mode is to increase or recover the pretightening force applied to the filler by screwing a filler nut on the upper part, the insufficient mode is only limited to the condition when manual inspection is found, the manual inspection maintenance has certain hysteresis in most cases, and a disc spring and the like in a filler self-adjusting structure adopted in the normal temperature environment cannot play the role of effectively adjusting the sealing gap of the filler in the low temperature environment, so, a simple and effective solution is sought
An effective solution to the problems in the related art has not been proposed yet.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a low temperature valve packing box upper portion seal structure to solve the problem that proposes in the above-mentioned background art.
In order to achieve the purpose, the utility model provides a low temperature valve packing box upper portion seal structure, including the valve rod, the packing is pressed the cover outside the valve rod, is provided with first O type circle between packing pressure cover and the valve rod, is provided with second O type circle outside the packing pressure cover, packing pressure cover below is provided with first filler, and the filler is compressed tightly by the first clamping ring that the below set up, and first clamping ring below is connected with the spring, and the other end of spring is connected with the second clamping ring, and the second packing that the second clamping ring compressed tightly the below and set up, and second filler below is provided with the junk ring, and the outside of packing pressure cover is provided with the packing box, it will block to open L shape draw-in groove and L shape junk ring on the packing box, and first filler, first clamping ring, second filler, spring all in the space that packing box, valve rod lateral wall, junk ring and packing box enclose through the external screw thread connection, the packing nut is located and hugs closely with valve rod outer wall and packing sleeve top end outer wall respectively.
Further, the first O-shaped ring is divided into two parts and is tightly attached to the valve rod.
Further, the first O-shaped ring is close to the top end of the packing pressing sleeve, and the second O-shaped ring is close to the bottom end of the packing pressing sleeve.
Further, the second O-shaped ring is tightly attached to the stuffing box.
Further, the spring is made of stainless steel.
Furthermore, the material of the filler is modified polychlorotrifluoroethylene.
Compared with the prior art, the utility model discloses following beneficial effect has: (1) the utility model discloses utilize the spring that sets up in the middle of the two-stage filler, help eliminating the condition that the elasticity decay back seal effect of packing descends, prevent that the medium from leaking from upper portion, lead to the emergence of accident. (2) The utility model discloses simple structure easily installs and dismantles. (3) The utility model discloses can avoid the filler self-interacting structure that adopts under normal atmospheric temperature environment can't play the effect of effectively adjusting filler seal clearance under low temperature environment.
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 view of an upper sealing structure of a cryogenic valve stuffing box according to the present invention;
reference numerals:
1. a stuffing box; 2. a second clamping ring; 3. a spring; 4. tightening the nut; 5. a packing nut; 6. the packing structure comprises a packing pressing sleeve 7, a valve rod 8, a first O-shaped ring 9, a second O-shaped ring 10, a first packing 11, a first pressing ring 12, a second packing 13 and a gasket.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, it should be noted that the terms "top", "bottom", "one side", "the other side", "front", "back", "middle part", "inside", "top", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of description and simplification of the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following, with reference to the drawings and the detailed description, further description of the present invention is made:
referring to fig. 1, a sealing structure at the upper part of a packing box of a low-temperature valve comprises a valve rod 7, a packing pressing sleeve 6 is installed at the outer side of the valve rod 7, a first O-ring 8 is arranged between the packing pressing sleeve 6 and the valve rod 7, a second O-ring 9 is arranged at the outer side of the packing pressing sleeve 6, a first packing 10 is arranged below the packing pressing sleeve 6, the packing 10 is pressed by a first pressing ring 11 arranged below the packing pressing sleeve 6, a spring 3 is connected below the first pressing ring 11, the other end of the spring 3 is connected with a second pressing ring 2, the second packing 12 arranged below the second pressing ring 2 is pressed by the second pressing ring 2, a lining ring 13 is arranged below the second packing 12, the outer side of the packing pressing sleeve 6 is provided with the packing box 1, the packing box 1 is provided with L-shaped clamping grooves and L-shaped clamping grooves for clamping the lining ring 13, the first packing 10, the first pressing ring 11, the second pressing ring 2, the second packing 12, the spring 3 is arranged at the side wall of the packing pressing sleeve 6, the side wall of the valve rod 7, the lining ring 13 and the packing 1 are tightly attached to the top end of the packing pressing sleeve 6, a packing nut 5 and a packing.
The sealing structure utilizes the spring 3 arranged between the first packing 10 and the second packing 12, the spring 3 has pressing force, when the clearance between the packing box 1 and the valve rod 7 is enlarged under the combined action of the first packing 10 and the second packing 12 which are reduced along with the reduction of elasticity and the contraction of materials in a low-temperature environment, so that the sealing effect is reduced, the elastic force lost by the first packing 10 and the second packing 12 is compensated, the reduction of the sealing effect after the elasticity attenuation of the packing is eliminated, and the medium is prevented from leaking from the upper part to cause accidents.
According to the above, the first O-ring 8 is divided into two parts and is attached to the valve stem 7. The first O-ring 8 is used for sealing between the valve stem 7 and the packing gland 6.
According to the above, the first O-ring 8 is located near the top end of the packing gland 6 and the second O-ring 9 is located near the bottom end of the packing gland 6.
According to the above, the second O-ring 9 is closely attached to the stuffing box 1. The second O-ring 9 is used for sealing between the stuffing box 1 and the stuffing press 6.
According to the above, the spring 3 is made of stainless steel. The stainless steel is suitable for use in ultralow temperature environment.
According to the above, the material of the filler 10 is modified polychlorotrifluoroethylene. The modified polychlorotrifluoroethylene has chemical corrosion resistance, heat resistance, high mechanical strength and toughness.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a low temperature valve stuffing box upper portion seal structure, its characterized in that, includes valve rod (7), packing gland (6) is installed in valve rod (7) outside, be provided with first O type circle (8) between packing gland (6) and valve rod (7), packing gland (6) outside is provided with second O type circle (9), packing gland (6) below is provided with first packing (10), packing (10) are compressed tightly by first clamping ring (11) that the below set up, first clamping ring (11) below is connected with spring (3), the other end of spring (3) is connected with second clamping ring (2), second packing (12) that second clamping ring (2) compressed tightly the below and set up, second packing (12) below is provided with junk ring (13), the outside of packing gland (6) is provided with packing gland (1), it has L shape draw-in groove and L shape draw-in groove to hug closely chucking clamping ring (13) to open on packing gland (1), first packing (10), first packing (11), second packing gland (6) and packing nut (5) top and valve rod (7) and packing gland (5) and packing nut (4) and sealing ring (4) and packing nut (5) and sealing ring (4) outside and sealing ring (7) and sealing nut, packing and sealing nut are located packing and packing gland (4) and sealing nut respectively.
2. A cryogenic valve stuffing box upper seal according to claim 1, wherein the first O-ring (8) is divided into two and is mounted against the valve stem (7).
3. A cryogenic valve stuffing box upper seal according to claim 1, characterized in that the first O-ring (8) is near the top end of the stuffing press sleeve (6) and the second O-ring (9) is near the bottom end of the stuffing press sleeve (6).
4. A cryogenic valve stuffing box upper seal structure according to claim 1, characterized in that the second O-ring (9) is tightly attached to the stuffing box (1).
5. The upper sealing structure of the stuffing box of the cryogenic valve as claimed in claim 1, wherein the material of the spring (3) is stainless steel.
6. The upper sealing structure of the stuffing box of the cryogenic valve according to claim 1, characterized in that the material of the stuffing (10) is modified polychlorotrifluoroethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922156739.2U CN211010130U (en) | 2019-12-05 | 2019-12-05 | Upper sealing structure of low-temperature valve stuffing box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922156739.2U CN211010130U (en) | 2019-12-05 | 2019-12-05 | Upper sealing structure of low-temperature valve stuffing box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211010130U true CN211010130U (en) | 2020-07-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922156739.2U Active CN211010130U (en) | 2019-12-05 | 2019-12-05 | Upper sealing structure of low-temperature valve stuffing box |
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| Country | Link |
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| CN (1) | CN211010130U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112289469A (en) * | 2020-11-03 | 2021-01-29 | 浙江伦特机电有限公司 | Leakage testing device |
| CN114033576A (en) * | 2021-10-18 | 2022-02-11 | 上海沪东造船阀门有限公司 | Multi-layer tandem sealing system |
-
2019
- 2019-12-05 CN CN201922156739.2U patent/CN211010130U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112289469A (en) * | 2020-11-03 | 2021-01-29 | 浙江伦特机电有限公司 | Leakage testing device |
| CN114033576A (en) * | 2021-10-18 | 2022-02-11 | 上海沪东造船阀门有限公司 | Multi-layer tandem sealing system |
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