CN112197059A - Multiple composite seal prevents valve rod leakage formula valve rod filler structure - Google Patents
Multiple composite seal prevents valve rod leakage formula valve rod filler structure Download PDFInfo
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- CN112197059A CN112197059A CN202011227700.6A CN202011227700A CN112197059A CN 112197059 A CN112197059 A CN 112197059A CN 202011227700 A CN202011227700 A CN 202011227700A CN 112197059 A CN112197059 A CN 112197059A
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- valve rod
- sealing
- valve
- sealing mechanism
- packing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
- F16K41/04—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a multiple composite sealing valve rod leakage prevention type valve rod packing structure, which solves the technical problems that in the prior art, a valve rod V-shaped packing group is easy to wear in the lifting motion process of a high-frequency switch of a valve rod, so that process gas in the valve is leaked, potential safety hazards are generated, and long-period stable operation of equipment is influenced. The invention comprises a primary sealing mechanism, a secondary sealing mechanism, a tertiary sealing mechanism and a press-fitting mechanism, wherein the primary sealing mechanism, the secondary sealing mechanism and the tertiary sealing mechanism are arranged in a valve cover; the first-stage, second-stage and third-stage sealing mechanisms are sequentially distributed along the valve rod from bottom to top. The valve rod packing is ensured to run on a system device for a longer period without stopping by arranging the first-stage seal, the second-stage seal and the third-stage seal and quantitatively controlling the screw hook tightening torque to ensure that the sealing is realized by the other stages of seals under the condition that a certain one-stage seal fails, so that the sealing performance of the valve rod packing is improved to prolong the on-line service life of the valve.
Description
Technical Field
The invention belongs to the technical field of valve structures, and particularly relates to a multiple-composite-sealing valve rod leakage prevention type valve rod packing structure.
Background
When the valve is used, the valve rod packing of the valve is in the process of high-frequency switch lifting movement, the valve rod V-shaped packing group can be abraded, the outer sealing performance of the valve rod of the valve is reduced, process gas is leaked from the valve rod packing to the atmosphere environment, potential safety hazards are generated, the device can be stopped when the process gas is serious, the loss is huge, and the long-period stable operation of the device is influenced.
Therefore, it is an urgent need to solve the above technical problems by designing a multiple-sealing valve stem leakage-preventing valve stem packing structure to solve at least some of the above technical problems.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a formula valve rod packing structure is prevented leaking by multiple compound seal, solves prior art valve rod V type packing group and easily wears and leads to the interior technology gas of valve to leak at valve rod high frequency time switch elevating movement in-process to produce the technical problem of potential safety hazard and influence the long period steady operation of equipment.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a multi-composite sealing valve rod leakage prevention type valve rod packing structure comprises a primary sealing mechanism, a secondary sealing mechanism and a tertiary sealing mechanism which are arranged in a valve cover and matched with a valve rod, and a press-fitting mechanism which is arranged on the valve cover and used for press-fitting the primary sealing mechanism, the secondary sealing mechanism and the tertiary sealing mechanism; the first-stage sealing mechanism, the second-stage sealing mechanism and the third-stage sealing mechanism are sequentially distributed along the valve rod from bottom to top.
Furthermore, the primary sealing mechanism comprises a V-shaped spring energy storage sealing ring which is arranged in the valve cover and is matched with the valve rod, and a shaft sleeve which is arranged in the valve cover and sleeved on the valve rod and is used for limiting the V-shaped spring energy storage sealing ring.
Furthermore, the secondary sealing mechanism comprises a V-shaped packing layer filled in the valve cover and an oil injection sleeve which is arranged in the valve cover and sleeved on the valve rod and used for limiting the V-shaped packing layer.
Furthermore, a butyl ester sealing ring for sealing the oil injection sleeve and the valve rod is embedded in the inner wall of the oil injection sleeve.
Furthermore, an O-shaped sealing ring for sealing the oil injection sleeve and the valve cover is embedded in the outer wall of the oil injection sleeve.
Furthermore, a valve cover limiting step is arranged on the valve cover, and an oil filling sleeve limiting step matched with the valve cover limiting step is arranged on the oil filling sleeve.
Further, a gap exists between the valve cover limiting step and the oil injection sleeve limiting step, and the length of the gap is 5-8 mm.
Further, tertiary sealing mechanism is including filling the graphite woven packing in the valve gap to and locate in the valve gap and suit and be used for carrying out spacing dish spring retaining ring to the graphite woven packing on the valve rod, dish spring retaining ring inner wall inlays and is equipped with the guide ring.
Furthermore, the press-fitting mechanism comprises a spiral hook which is arranged on the valve cover and is sleeved on the valve rod, and a disc spring is arranged between the spiral hook and the disc spring retainer ring.
Further, the valve gap is embedded to be equipped with the first dust ring with valve rod looks adaptation, and the embedded second dust ring that is equipped with valve rod looks adaptation of swivel hook.
Compared with the prior art, the invention has the following beneficial effects:
the valve cover is simple in structure, scientific and reasonable in design and convenient to use, and the V-shaped spring energy storage sealing ring is arranged at the bottom end of the valve cover to serve as primary sealing; the middle section is provided with a V-shaped packing layer, a butyl ester sealing ring and an O-shaped ring as secondary sealing; the upper section is provided with graphite braided packing as three-stage sealing. Meanwhile, the moment of screwing up the screw hook is quantitatively controlled, so that sealing is realized through other stages of sealing under the condition that a certain stage of sealing fails, the valve rod packing is ensured to run on a system device for a longer period without stopping, and the sealing performance of the valve rod packing is improved so as to prolong the online service life of the valve. The invention can effectively solve the technical problems that in the process of high-frequency switch lifting motion of valve stem packing in the prior art, the outer sealing performance of the valve stem is reduced due to abrasion of the valve stem V-shaped packing group, so that process gas leaks from the valve stem packing to the atmospheric environment to generate potential safety hazards, and the system device can be stopped to bring huge loss and influence the long-period stable operation of the device in serious cases.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is an enlarged view of the oil injection sleeve of the present invention.
Fig. 3 is an overall schematic view of the assembly of the present invention into a valve.
Wherein, the names corresponding to the reference numbers are:
1-a first dust ring, 2-V type spring energy storage sealing rings, 3-V type packing layers, 4-O type sealing rings, 5-butyl ester sealing rings, 6-graphite woven packing, 7-guide rings, 8-disc springs, 9-spiral hooks, 10-disc spring retainer rings, 11-oil injection sleeves, 12-shaft sleeves, 13-valve covers, 14-valve rods, 15-valve cover limiting steps, 16-oil injection sleeve limiting steps, 17-gaps and 18-second dust rings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and thus, it should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; of course, mechanical connection and electrical connection are also possible; alternatively, they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1-3, the present invention provides a multiple-sealing valve stem leakage-preventing valve stem packing structure, which uses multi-stage sealing, and is used alternatively to ensure that effective sealing between a valve stem and a valve cover is realized by the remaining stages of sealing under the condition that one stage of sealing fails. The invention comprises a primary sealing mechanism, a secondary sealing mechanism and a tertiary sealing mechanism which are arranged in a valve cover 13 and matched with a valve rod 14, and a press-mounting mechanism which is arranged on the valve cover 13 and used for press-mounting the primary sealing mechanism, the secondary sealing mechanism and the tertiary sealing mechanism; the first-stage sealing mechanism, the second-stage sealing mechanism and the third-stage sealing mechanism are sequentially distributed along the valve rod 14 from bottom to top.
The primary sealing mechanism comprises a V-shaped spring energy storage sealing ring 2 which is arranged in a valve cover 13 and matched with a valve rod 14, and a shaft sleeve 12 which is arranged in the valve cover 13 and sleeved on the valve rod 14 and used for limiting the V-shaped spring energy storage sealing ring 2.
The secondary sealing mechanism comprises a V-shaped packing layer 3 filled in a valve cover 13 and an oil filling sleeve 11 which is arranged in the valve cover 13 and sleeved on a valve rod 14 and used for limiting the V-shaped packing layer 3. And a butyl ester sealing ring 5 for sealing the oil injection sleeve 11 and the valve rod 14 is embedded in the inner wall of the oil injection sleeve 11. An O-shaped sealing ring 4 for sealing the oil injection sleeve 11 and the valve cover 13 is embedded in the outer wall of the oil injection sleeve 11. The valve cover 13 is provided with a valve cover limiting step 15, and the oil injection sleeve 11 is provided with an oil injection sleeve limiting step 16 matched with the valve cover limiting step 15. A gap 17 exists between the valve cover limiting step 15 and the oil injection sleeve limiting step 16, and the length of the gap 17 is 5-8 mm.
The three-stage sealing mechanism comprises graphite woven packing 6 filled in a valve cover 13, and a disc spring retainer ring 10 which is arranged in the valve cover 13 and sleeved on a valve rod 14 and used for limiting the graphite woven packing 6, wherein a guide ring 7 is embedded in the inner wall of the disc spring retainer ring 10. The press-fitting mechanism comprises a spiral hook 9 which is arranged on the valve cover 13 and is also sleeved on the valve rod 14, and a disc spring 8 is arranged between the spiral hook 9 and a disc spring retainer ring 10. The valve cover 13 is embedded with a first dustproof ring 1 matched with the valve rod 14, and the spiral hook 9 is embedded with a second dustproof ring 18 matched with the valve rod 14.
The valve cover is simple in structure, scientific and reasonable in design and convenient to use, and the V-shaped spring energy storage sealing ring is arranged at the bottom end of the valve cover to serve as primary sealing; the middle section is provided with a V-shaped packing layer, a butyl ester sealing ring and an O-shaped ring as secondary sealing; the upper section is provided with graphite braided packing as three-stage sealing. Meanwhile, the moment of screwing up the screw hook is quantitatively controlled, so that sealing is realized through other stages of sealing under the condition that a certain stage of sealing fails, the valve rod packing is ensured to run on a system device for a longer period without stopping, and the sealing performance of the valve rod packing is improved so as to prolong the online service life of the valve. The invention can effectively solve the technical problems that in the process of high-frequency switch lifting motion of valve stem packing in the prior art, the outer sealing performance of the valve stem is reduced due to abrasion of the valve stem V-shaped packing group, so that process gas leaks from the valve stem packing to the atmospheric environment to generate potential safety hazards, and the system device can be stopped to bring huge loss and influence the long-period stable operation of the device in serious cases.
According to the invention, the first dustproof ring and the second dustproof ring are respectively arranged at the bottom of the valve cover and the upper part of the screw hook, so that dust in a pipeline and in the atmosphere is isolated, and the sealing performance is prevented from being influenced by the dust entering the sealing ring.
The V-shaped spring energy storage sealing ring is arranged at the bottom end of the valve cover and used as a primary seal, and the valve cover is limited by the shaft sleeve. When the pressure in the valve body cavity is higher, the sealing ring of the V-shaped spring in the sealing ring is expanded by pressure (self-tightening action of medium pressure), so that the valve body has better sealing performance. After the V-shaped spring energy storage sealing ring is worn and failed, the V-shaped spring energy storage sealing ring still can isolate most of pressure, and a small part of medium gas can pass through the V-shaped spring energy storage sealing ring, so that a good sealing condition is provided for a V-shaped packing layer of the next stage.
The middle section of the valve cover is provided with a V-shaped packing layer and an oil filling sleeve, a butyl ester sealing ring special for a shaft is arranged inside the oil filling sleeve, and an O-shaped sealing ring is arranged outside the oil filling sleeve to serve as a second-stage seal. After initial assembly, a certain gap L (5-8 mm) exists between the oil injection sleeve limiting step and the valve cover limiting step, the sealing performance of the V-shaped packing layer sealing ring is adjusted by controlling the screwing torque of the nut, when the primary seal does not lose efficacy, the set screw hook torque is small, the V-shaped packing layer is not opened by the oil injection sleeve pressing force, the oil injection sleeve is slightly contacted with the valve rod, and the auxiliary sealing effect is achieved. After the primary seal fails, the V-shaped packing layer sealing ring is compressed by increasing the screwing torque of the screw hook, so that the secondary seal becomes the main seal, and the sealing performance of the valve rod is ensured. Meanwhile, the moment cannot be increased too much at one time, and the moment needs to be stepped and increased according to the ratio, so that the V-shaped packing layer at the secondary sealing position of the valve rod can be screwed, adjusted and sealed for many times, and the sealing life is prolonged.
The gap L (5-8 mm) is formed, so that the tightening torque of the screw hook can be adjusted for multiple times, when the gap L is adjusted to be zero, the valve cover limiting step and the oil filling sleeve limiting step are attached to each other, the maximum value of the pressing force of the V-shaped packing layer is achieved, and if the V-shaped packing layer fails in the later period, the V-shaped packing layer cannot be tightly pressed through the screw hook.
Therefore, the graphite braided packing is arranged on the upper section of the valve cover to serve as a three-stage seal, and the disc spring retainer ring is pressed on the graphite braided packing. The lowest tightening torque of the spiral hook is larger than the maximum tightening torque of the V-shaped packing layer when the selected graphite woven packing is sealed. Therefore, after the primary seal and the secondary seal fail, the tightening torque is increased, the graphite braided packing is tightly pressed with the valve rod, the tertiary seal is exerted, and the final sealing effect is achieved.
Meanwhile, the disc spring is arranged at the upper end of the disc spring retainer ring, the elastic force of the disc spring can prop against the screw hook tightly to prevent the screw hook from loosening, and meanwhile, when the V-shaped packing seal ring and the graphite woven packing are slightly worn, self-compensation can be carried out through the elastic force of the disc spring. And a better sealing effect is achieved.
Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, but not to limit the technical solutions, and certainly not to limit the patent scope of the present invention; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention; that is, the technical problems to be solved by the present invention, which are not substantially changed or supplemented by the spirit and the concept of the main body of the present invention, are still consistent with the present invention and shall be included in the scope of the present invention; in addition, the technical scheme of the invention is directly or indirectly applied to other related technical fields, and the technical scheme is included in the patent protection scope of the invention.
Claims (10)
1. A multi-composite sealing valve rod leakage prevention type valve rod packing structure is characterized by comprising a primary sealing mechanism, a secondary sealing mechanism and a tertiary sealing mechanism which are arranged in a valve cover (13) and matched with a valve rod (14), and a press-fitting mechanism which is arranged on the valve cover (13) and used for press-fitting the primary sealing mechanism, the secondary sealing mechanism and the tertiary sealing mechanism; the first-stage sealing mechanism, the second-stage sealing mechanism and the third-stage sealing mechanism are sequentially distributed along the valve rod (14) from bottom to top.
2. The multiple-sealing valve rod leakage prevention type valve rod packing structure according to claim 1, wherein the primary sealing mechanism comprises a V-shaped spring energy storage sealing ring (2) which is arranged in the valve cover (13) and matched with the valve rod (14), and a shaft sleeve (12) which is arranged in the valve cover (13) and sleeved on the valve rod (14) and used for limiting the V-shaped spring energy storage sealing ring (2).
3. The multiple-composite-sealing valve-rod-leakage-preventing valve-rod packing structure according to claim 1, wherein the secondary sealing mechanism comprises a V-shaped packing layer (3) filled in the valve cover (13), and an oil injection sleeve (11) which is arranged in the valve cover (13) and sleeved on the valve rod (14) and used for limiting the V-shaped packing layer (3).
4. The multiple-compound-sealing valve rod leakage-preventing type valve rod packing structure as claimed in claim 3, wherein a butyl ester sealing ring (5) for sealing the oil injection sleeve (11) and the valve rod (14) is embedded in the inner wall of the oil injection sleeve (11).
5. The multiple-compound-sealing valve rod leakage-preventing type valve rod packing structure as claimed in claim 3, wherein an O-shaped sealing ring (4) for sealing the oil injection sleeve (11) and the valve cover (13) is embedded in the outer wall of the oil injection sleeve (11).
6. The multiple-composite-sealing valve-stem-leakage-preventing type valve stem packing structure as claimed in claim 3, wherein the valve cap (13) is provided with a valve cap limiting step (15), and the oil filling sleeve (11) is provided with an oil filling sleeve limiting step (16) matched with the valve cap limiting step (15).
7. The multiple-composite-sealing valve rod leakage-preventing type valve rod packing structure according to claim 6, characterized in that a gap (17) exists between the valve cover limiting step (15) and the oil filling sleeve limiting step (16), and the length of the gap (17) is 5-8 mm.
8. The multiple composite sealing valve rod leakage prevention valve rod packing structure according to claim 1, wherein the three-stage sealing mechanism comprises graphite woven packing (6) filled in the valve cover (13), and a disc spring retainer ring (10) which is arranged in the valve cover (13) and sleeved on the valve rod (14) and used for limiting the graphite woven packing (6), and a guide ring (7) is embedded in the inner wall of the disc spring retainer ring (10).
9. The multiple-composite-sealing valve rod leakage-preventing type valve rod packing structure as claimed in claim 8, wherein the press-fitting mechanism comprises a screw hook (9) mounted on the valve cover (13) and also sleeved on the valve rod (14), and a disc spring (8) is arranged between the screw hook (9) and the disc spring retainer ring (10).
10. The multiple-sealing valve rod leakage-proof valve rod packing structure according to claim 9, wherein a first dust ring (1) matched with the valve rod (14) is embedded in the valve cover (13), and a second dust ring (18) matched with the valve rod (14) is embedded in the screw hook (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011227700.6A CN112197059A (en) | 2020-11-06 | 2020-11-06 | Multiple composite seal prevents valve rod leakage formula valve rod filler structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011227700.6A CN112197059A (en) | 2020-11-06 | 2020-11-06 | Multiple composite seal prevents valve rod leakage formula valve rod filler structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112197059A true CN112197059A (en) | 2021-01-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011227700.6A Pending CN112197059A (en) | 2020-11-06 | 2020-11-06 | Multiple composite seal prevents valve rod leakage formula valve rod filler structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN112197059A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404925A (en) * | 2021-06-30 | 2021-09-17 | 扬州宝诺金属制品有限公司 | Multiple composite sealing valve rod leakage prevention type valve rod and machining process thereof |
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|---|---|---|---|---|
| JPH0658460A (en) * | 1991-07-10 | 1994-03-01 | Akira Oshima | Gate valve capable of changing gland packing even during passage of water |
| CN204226828U (en) * | 2014-09-24 | 2015-03-25 | 江苏诚功阀门科技有限公司 | Novel ultralow-temperature stop valve |
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| CN106090246A (en) * | 2016-08-17 | 2016-11-09 | 江苏海纳机电集团有限公司 | A kind of hand stop valve with sealing compensation |
| CN108006314A (en) * | 2017-12-01 | 2018-05-08 | 中国寰球工程有限公司 | Cryogenic ball valve fugacity combined stuffing structure |
| CN109827005A (en) * | 2019-03-29 | 2019-05-31 | 湖北泰和石化设备有限公司 | A kind of cryogenic valve fugacity composite filling structure and encapsulating method |
-
2020
- 2020-11-06 CN CN202011227700.6A patent/CN112197059A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0658460A (en) * | 1991-07-10 | 1994-03-01 | Akira Oshima | Gate valve capable of changing gland packing even during passage of water |
| CN204226828U (en) * | 2014-09-24 | 2015-03-25 | 江苏诚功阀门科技有限公司 | Novel ultralow-temperature stop valve |
| CN204879013U (en) * | 2015-07-17 | 2015-12-16 | 张家港富瑞特种装备股份有限公司 | Low temperature pneumatic ball valve packing structure |
| CN106090246A (en) * | 2016-08-17 | 2016-11-09 | 江苏海纳机电集团有限公司 | A kind of hand stop valve with sealing compensation |
| CN108006314A (en) * | 2017-12-01 | 2018-05-08 | 中国寰球工程有限公司 | Cryogenic ball valve fugacity combined stuffing structure |
| CN109827005A (en) * | 2019-03-29 | 2019-05-31 | 湖北泰和石化设备有限公司 | A kind of cryogenic valve fugacity composite filling structure and encapsulating method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404925A (en) * | 2021-06-30 | 2021-09-17 | 扬州宝诺金属制品有限公司 | Multiple composite sealing valve rod leakage prevention type valve rod and machining process thereof |
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Application publication date: 20210108 |