CN112240428A - Composite packing sealing structure - Google Patents
Composite packing sealing structure Download PDFInfo
- Publication number
- CN112240428A CN112240428A CN202011097791.6A CN202011097791A CN112240428A CN 112240428 A CN112240428 A CN 112240428A CN 202011097791 A CN202011097791 A CN 202011097791A CN 112240428 A CN112240428 A CN 112240428A
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- packing
- seal
- valve
- valve body
- composite
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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 composite packing sealing structure, which comprises: the valve body penetrates through a valve rod of the valve body; an accommodating space for accommodating a sealing assembly is formed between the surface of the valve rod and the inner surface of the valve body; the seal assembly includes: a stem seal disposed on said valve stem remote from said top end of said valve body to form a first seal against the valve; a plurality of packing seals disposed above the stem seal to form a second seal against the valve. The invention relates to a method for reducing industrial atmospheric environment hazards, reducing toxic gas leakage and combustible explosive gas volatilization, and ensuring life safety and property loss.
Description
Technical Field
The invention relates to the field of valve packing sealing, in particular to a micro-leakage composite packing sealing structure.
Background
The sealing performance of the valve is one of main indexes for checking the quality of the valve, and under the special working conditions that certain special media, such as toxic gas, flammable and explosive LNG (liquefied natural gas) and the like have serious influence on life safety and are not allowed to be discharged into the atmosphere, the outer sealing of the valve is more important than the inner sealing. Especially, the valve packing seal has the rotating and lifting movement of a valve rod along with the opening and closing of the valve, is easier to generate leakage compared with a static seal, is the most critical external seal, and is especially important.
Disclosure of Invention
The invention aims to provide a composite packing sealing structure, which adopts the principles of low dissipation and low volatilization of fluid micromolecules under zero pressure difference and selects low-permeability materials to reduce the leakage of boundary gaps, thereby realizing the purposes of reducing the harm of industrial atmospheric environment, reducing the leakage of toxic gas and the volatilization of flammable and explosive gas, ensuring life safety and property loss and bringing huge economic benefit, ecological benefit and social benefit.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
a composite packing seal arrangement, comprising: the valve body penetrates through a valve rod of the valve body; an accommodating space for accommodating a sealing assembly is formed between the surface of the valve rod and the inner surface of the valve body; the seal assembly includes: a stem seal disposed on said valve stem remote from said top end of said valve body to form a first seal against the valve; a plurality of packing seals disposed above the stem seal to form a second seal against the valve.
Preferably, the stem seal is a lip-type flood-plug seal.
Preferably, each of said packing seals comprises: the valve rod is provided with a first packing ring, a second packing ring and a third packing ring, wherein the second packing ring is positioned between the first packing ring and the third packing ring, and each packing ring is sleeved on the valve rod.
Preferably, the method further comprises the following steps: a packing pad sleeved on the valve rod and located between the packing seal and the rod seal.
Preferably, each of the packing seals is separated by a spacer ring.
Preferably, the valve body is provided with a detection hole for connecting detection equipment at a position opposite to the spacer ring, and each detection hole is internally provided with a plug.
Preferably, the surface roughness of the valve stem is greater than or equal to 0.4 μm; the roughness of the valve body inner surface is greater than or equal to 0.8 μm.
Preferably, the method further comprises the following steps: the packing gland is connected with one end of the packing pressure plate, and the other end of the packing pressure plate is abutted to the packing sealing element; one end of each compression bolt penetrates through the packing pressing plate and is fixed on the end face of the top end of the valve body; the other end is provided with a locking nut; the gasket of each pair is correspondingly sleeved on the compression bolt, one gasket of each pair of gaskets is arranged on the packing pressure plate, and the other gasket of each pair of gaskets is in contact with the locking nut; and a disc spring is arranged between each pair of gaskets, the disc spring is compressed by rotating the locking nut, axial pressing force is provided for the packing sealing element through the packing gland, the packing sealing element is radially expanded to form radial pressing force for the valve rod and the inner wall of the valve body, and the valve is sealed for the second time.
Preferably, the first packing ring, the second packing ring and the third packing ring are respectively and correspondingly provided with a groove and a protrusion, and the groove and the protrusion are embedded into each other under the action of the axial pressing force.
The invention has at least one of the following advantages:
the structural design adopts a micro-leakage sealing mechanism, and the micro-leakage composite seal with low volatilization and low emission is designed under the composite action of zero pressure difference, low permeability and low boundary gap leakage. The lip-type universal plug rod seal and the low-leakage filler combined seal are ingeniously combined into a composite seal. The primary sealing adopts lip-type flooding plug sealing, and zero leakage of the valve can be realized. Thereby blocking the high pressure of the fluid in the front end valve and reducing the pressure to the ambient atmosphere at the rear end of the rod seal. The secondary seal adopts double low-leakage packing seal, and because the pressure drop before the primary seal reduces the packing seal is the ambient atmospheric pressure, the pressure difference between two sides acting on the secondary packing seal is zero, thereby reducing the dispersion and overflow trend of the packing seal under high pressure difference for gas to escape to the outside. Meanwhile, the use of a low-leakage sealing material and the design of a packing structure for reducing the leakage of the boundary clearance of the parts of the valve rod packing cavity are provided, the standard requirement of the micro-leakage packing for reducing the emission and the volatilization is met, and the key technology of the micro-leakage and the core bottleneck of the external discharge of the valve are broken through.
The invention adopts the principles of low dissipation and low volatilization of fluid micromolecules under zero pressure difference, selects low-permeability materials and aims to reduce the leakage of boundary gaps, designs the micro-leakage composite packing with low emission and no pollution, reduces the harm of industrial atmospheric environment, reduces the leakage of toxic gas and the volatilization of inflammable and explosive gas, ensures the life safety and property loss and brings huge economic benefit, ecological benefit and social benefit.
Drawings
Fig. 1 is a schematic view of a composite packing sealing structure according to an embodiment of the present invention.
Detailed Description
The composite packing sealing structure proposed by the present invention is further described in detail with reference to fig. 1 and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
The present embodiment provides a composite packing sealing structure, including: a valve body 100, a valve stem 200 penetrating the valve body 100; an accommodating space (packing chamber) for accommodating a sealing assembly is formed between the surface of the valve rod 200 and the inner surface of the valve body 200; the seal assembly includes: a stem seal 201, which is sleeved on the valve stem 200 and far away from the top end of the valve body 100 to form a first seal for the valve; a plurality of packing seals disposed above the stem seal to form a second seal against the valve.
The rod sealing member 201 is a lip-type flood plug seal, the rod sealing member 201 seals the valve for the first time, zero leakage of the valve can be achieved, and therefore the high pressure of fluid in the valve at the front end (the end far away from the top end of the valve body) of the rod sealing member 201 is blocked, and the pressure can be reduced to the ambient atmospheric pressure at the rear end (the end close to the top end of the valve body) of the rod sealing member 201.
Each of the packing seals includes: the valve rod comprises a first packing ring 301, a second packing ring 302 and a third packing ring 303, wherein the second packing ring 302 is positioned between the first packing ring and the third packing ring, and each packing ring is sleeved on the valve rod. Each of the packing seals is isolated from the other by a spacer ring 400. The packing sealing element forms a second sealing of the valve, so that micro leakage of the valve can be realized, and because the rod sealing element 201 forms a first sealing of the valve and reduces the air pressure at the packing sealing element to the ambient atmospheric pressure, the pressure difference acting on two ends of the packing sealing element is zero, and the gas fleeing and scattering tendency caused by the large pressure difference at two ends of the existing packing sealing element is reduced. The first packing ring 301, the second packing ring 302 and the third packing ring 303 are made of low-permeability materials.
The first packing ring 301, the second packing ring 302 and the third packing ring 303 are respectively and correspondingly provided with a groove and a protrusion, under the action of axial pressing force along the valve rod 200, the groove and the protrusion are mutually embedded to enable the first to third packing rings to radially extend and open, so that radial pressing force along the valve rod 200 is formed on the inner wall of the valve rod 200 and the packing cavity, and the leakage of the boundary gap between the valve rod 200 and the packing cavity is reduced.
Further comprising: a packing pad 300 fitted over the valve stem 200 between one of the packing seals adjacent to the stem seal 201 and the stem seal 201.
In the present embodiment, the packing seals may be two, but are not limited thereto.
The valve body 100 is provided with a detection hole for connecting detection equipment at a position opposite to the spacer ring 400, and each detection hole is provided with a plug 500. When the detection or the test is needed, the plug 500 is pulled out, and then the detection device is connected for detection or test.
The surface roughness of the valve stem 200 is greater than or equal to 0.4 μm; the roughness of the inner surface of the valve body 100 is 0.8 μm or more, whereby the above packing can be further leaked from the surface of the valve stem 200 and the clearance from the inner surface of the valve body 100.
Further comprising: the packing gland 600 comprises a packing pressure plate 601 and a packing gland 600, wherein one end of the packing gland 600 is connected with the packing pressure plate 601, and the other end of the packing gland 600 is abutted to the packing sealing element; a plurality of pressing bolts 605, wherein one end of each pressing bolt 605 penetrates through the packing press plate 601 and is fixed on the end surface of the top end of the valve body 100; the other end is provided with a locking nut 604; a plurality of pairs of washers, each pair of washers is correspondingly sleeved on the hold-down bolt 605, one washer 602 of each pair of washers is arranged on the packing press plate 601, and the other washer 602 is in contact with the lock nut 604; a disc spring 603 is disposed between each pair of the washers, and rotation of the retaining nut 604 compresses the disc spring 603 to provide axial compression of the packing seal via the packing gland 600, which expands radially to provide radial compression against the valve stem 200 and the inner wall of the valve body 100 to provide a second seal against the valve.
The disc spring 603 installed on the lower portion of the locking nut 604 provides pre-tightening force, which can continuously apply proper pressure to the packing, and reduces the sealing failure caused by the slack adjustment of the packing system. Under the combined action of zero pressure difference, low permeability and low boundary gap leakage, the low-volatilization and low-emission micro-leakage composite seal based on the zero pressure difference principle is designed.
The structural design provided by the embodiment adopts a micro-leakage sealing mechanism, and the micro-leakage composite seal with low volatilization and low emission is designed under the composite action of zero pressure difference, low permeability and low boundary gap leakage. The lip-type universal plug rod seal and the low-leakage filler combined seal are ingeniously combined into a composite seal. The primary sealing adopts lip-type flooding plug sealing, and zero leakage of the valve can be realized. Thereby blocking the high pressure of the fluid in the front end valve and reducing the pressure to the ambient atmosphere at the rear end of the rod seal. The secondary seal adopts double low-leakage packing seal, and because the pressure drop before the primary seal reduces the packing seal is the ambient atmospheric pressure, the pressure difference between two sides acting on the secondary packing seal is zero, thereby reducing the dispersion and overflow trend of the packing seal under high pressure difference for gas to escape to the outside. Meanwhile, the use of a low-leakage sealing material and the design of a packing structure for reducing the leakage of the boundary clearance of the parts of the valve rod packing cavity are provided, the standard requirement of the micro-leakage packing for reducing the emission and the volatilization is met, and the key technology of the micro-leakage and the core bottleneck of the external discharge of the valve are broken through.
The embodiment adopts the principles of low loss and low volatilization of fluid micromolecules under zero pressure difference, selects low-permeability materials and aims to reduce the leakage of boundary gaps, designs the micro-leakage composite packing seal with low emission and no pollution, reduces the harm of industrial atmospheric environment, reduces the leakage of toxic gas and the volatilization of inflammable and explosive gas, ensures the life safety and property loss and brings huge economic, ecological and social benefits.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. A composite packing seal structure, comprising:
the valve body penetrates through a valve rod of the valve body; an accommodating space for accommodating a sealing assembly is formed between the surface of the valve rod and the inner surface of the valve body;
the seal assembly includes: a stem seal disposed on said valve stem remote from said top end of said valve body to form a first seal against the valve;
a plurality of packing seals disposed above the stem seal to form a second seal against the valve.
2. The composite packing seal arrangement of claim 1, wherein said stem seal is a lip-type flood-plug seal.
3. A composite packing arrangement according to claim 1 or 2, wherein each said packing seal comprises: the valve rod is provided with a first packing ring, a second packing ring and a third packing ring, wherein the second packing ring is positioned between the first packing ring and the third packing ring, and each packing ring is sleeved on the valve rod.
4. The composite packing seal arrangement of claim 3, further comprising: a packing pad sleeved on the valve rod and located between the packing seal and the rod seal.
5. The composite packing seal arrangement of claim 4, wherein each of said packing seals is separated therefrom by a spacer ring.
6. The composite packing seal structure of claim 5, wherein a detection hole for connecting a detection device is provided at a position of the valve body opposite to the spacer ring, and a plug is provided in each detection hole.
7. The composite packing seal arrangement of claim 6, wherein the valve stem has a surface roughness of 0.4 μm or greater; the roughness of the valve body inner surface is greater than or equal to 0.8 μm.
8. The composite packing seal arrangement of claim 7, further comprising:
a packing press plate is arranged on the bottom of the box body,
one end of the packing gland is connected with the packing pressing plate, and the other end of the packing gland is abutted to the packing sealing element;
one end of each compression bolt penetrates through the packing pressing plate and is fixed on the end face of the top end of the valve body; the other end is provided with a locking nut;
the gasket of each pair is correspondingly sleeved on the compression bolt, one gasket of each pair of gaskets is arranged on the packing pressure plate, and the other gasket of each pair of gaskets is in contact with the locking nut;
a disc spring is arranged between each pair of the gaskets,
and rotating the locking nut to compress the disc spring, providing axial pressing force for the packing sealing element through the packing gland, and radially extending the packing sealing element to form radial pressing force on the valve rod and the inner wall of the valve body so as to perform secondary sealing on the valve.
9. The composite packing structure of claim 8, wherein said first packing ring, said second packing ring and said third packing ring have corresponding grooves and protrusions, respectively, and said grooves and protrusions are engaged with each other under the action of said axial compressive force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011097791.6A CN112240428A (en) | 2020-10-14 | 2020-10-14 | Composite packing sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011097791.6A CN112240428A (en) | 2020-10-14 | 2020-10-14 | Composite packing sealing structure |
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| Publication Number | Publication Date |
|---|---|
| CN112240428A true CN112240428A (en) | 2021-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011097791.6A Pending CN112240428A (en) | 2020-10-14 | 2020-10-14 | Composite packing sealing structure |
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| Country | Link |
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| CN (1) | CN112240428A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2372204A1 (en) * | 2010-03-17 | 2011-10-05 | Tyco Valves & Controls Italia S.r.L. | Seal system for high-pressure fluid shut-off valves |
| CN203784305U (en) * | 2014-01-13 | 2014-08-20 | 济南钢城矿业有限公司 | Shaft end sealing structure of stirring shaft of disc type vacuum filter |
| CN204664603U (en) * | 2015-05-04 | 2015-09-23 | 中国海洋石油总公司 | A kind of Deep-sea high voltage valve rod Bidirectional seal structure |
| CN205244589U (en) * | 2015-12-16 | 2016-05-18 | 江苏科维仪表控制工程有限公司 | Packing structure of stop valve |
| CN205663909U (en) * | 2016-05-19 | 2016-10-26 | 浙江石化阀门有限公司 | Ultra -low temperature expanding metal seal valve |
| 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 |
| CN111255945A (en) * | 2020-02-26 | 2020-06-09 | 苏州纽威阀门股份有限公司 | Valve rod sealing structure and valve |
-
2020
- 2020-10-14 CN CN202011097791.6A patent/CN112240428A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2372204A1 (en) * | 2010-03-17 | 2011-10-05 | Tyco Valves & Controls Italia S.r.L. | Seal system for high-pressure fluid shut-off valves |
| CN203784305U (en) * | 2014-01-13 | 2014-08-20 | 济南钢城矿业有限公司 | Shaft end sealing structure of stirring shaft of disc type vacuum filter |
| CN204664603U (en) * | 2015-05-04 | 2015-09-23 | 中国海洋石油总公司 | A kind of Deep-sea high voltage valve rod Bidirectional seal structure |
| CN205244589U (en) * | 2015-12-16 | 2016-05-18 | 江苏科维仪表控制工程有限公司 | Packing structure of stop valve |
| CN205663909U (en) * | 2016-05-19 | 2016-10-26 | 浙江石化阀门有限公司 | Ultra -low temperature expanding metal seal valve |
| 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 |
| CN111255945A (en) * | 2020-02-26 | 2020-06-09 | 苏州纽威阀门股份有限公司 | Valve rod sealing structure and valve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Application publication date: 20210119 |
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| RJ01 | Rejection of invention patent application after publication |