CN114033576A - Multi-layer tandem sealing system - Google Patents
Multi-layer tandem sealing system Download PDFInfo
- Publication number
- CN114033576A CN114033576A CN202111211697.3A CN202111211697A CN114033576A CN 114033576 A CN114033576 A CN 114033576A CN 202111211697 A CN202111211697 A CN 202111211697A CN 114033576 A CN114033576 A CN 114033576A
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- Prior art keywords
- rod piece
- wall
- packing
- cylinder barrel
- pressing sleeve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/60—Constructional parts; Details not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/60—Constructional parts; Details not otherwise provided for
- F02K9/62—Combustion or thrust chambers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gasket Seals (AREA)
Abstract
The invention provides a multi-layer tandem type sealing system which is used for sealing between a rod piece and the inner wall of a cylinder barrel, wherein the rod piece extends out of an opening of the cylinder barrel and comprises a locking nut, a first flooding plug, a second flooding plug, a packing pressing sleeve, packing and a packing pad; the locking nut is sleeved on the rod piece and the outer wall of the cylinder barrel, one end of the locking nut is connected with the rod piece, the other end of the locking nut is connected with the outer wall of the cylinder barrel, and a first O-shaped ring is arranged between the locking nut and the rod piece; one part of the packing pressing sleeve is accommodated in the nut gap, the other part of the packing pressing sleeve is arranged in the gap between the rod piece and the inner wall of the cylinder barrel, and second O-shaped rings are arranged between the packing pressing sleeve and the rod piece and between the packing pressing sleeve and the inner wall of the cylinder barrel; a filler is arranged between the filler pressing sleeve and the filler pad, and a second flooding plug is arranged between the filler pressing sleeve and the rod piece; a first flooding plug is also arranged in a gap between the rod piece and the inner wall of the cylinder barrel. The sealing system can ensure that the sealing does not lose efficacy in the environments of low temperature, vibration, high pressure and the like.
Description
Technical Field
The invention relates to the field of sealing structures, in particular to a multi-layer tandem type sealing system.
Background
With the development of various industries such as aerospace, navigation and shipbuilding, the importance of the sealing technology in extremely complex working conditions (ultra-low temperature, ultra-high temperature, high pressure, multiphase flow and the like) is gradually highlighted. Such as Liquefied Natural Gas (LNG) ships, are specialized ships designed and constructed for transporting liquefied natural gas at an ultra-low temperature of-163 ℃, in which pipeline systems all have strict sealing requirements to prevent LNG leakage; the liquid rocket, the liquid oxymethane engine and the like are easy to cause sealing failure and toxic substance leakage due to low temperature, vibration, high pressure and the like.
Therefore, in view of the problems in the prior art, there is a need for a sealing system for sealing between an engine rod and a cavity, which can ensure that the seal does not fail in low temperature, vibration, high pressure and other environments.
Disclosure of Invention
The invention provides a multi-layer series connection type sealing system which can ensure that sealing does not lose efficacy in the environments of low temperature, vibration, high pressure and the like.
In order to achieve the above objects and other related objects, the present invention provides a multi-level tandem type sealing system for sealing between a rod member and an inner wall of a cylinder, wherein the rod member extends out of an opening of the cylinder, and comprises a lock nut, a first flooding plug, a second flooding plug, a packing pressing sleeve, a packing pad, a first O-ring and a second O-ring;
the locking nut is sleeved on the rod piece and the outer wall of the cylinder barrel, one end of the locking nut is connected with the rod piece, the other end of the locking nut is connected with the outer wall of the cylinder barrel, a nut gap is reserved between the inner wall of the locking nut and the rod piece, and the first O-shaped ring is arranged between the locking nut and the rod piece;
one part of the packing pressing sleeve is accommodated in the nut gap, the other part of the packing pressing sleeve is arranged in the gap between the rod piece and the inner wall of the cylinder barrel, and the second O-shaped rings are arranged between the packing pressing sleeve and the rod piece and between the packing pressing sleeve and the inner wall of the cylinder barrel;
the packing pad is arranged in a gap between the rod piece and the inner wall of the cylinder barrel, the packing is arranged between the packing pressing sleeve and the packing pad, and a second flooding plug is arranged between the packing pressing sleeve and the rod piece;
the first flooding plug is also arranged in a gap between the rod piece and the inner wall of the cylinder barrel;
preferably, the first plunger is further provided with a plunger pad, and the plunger pad is located in a gap between the rod piece and the inner wall of the cylinder barrel.
Preferably, the flooding plug comprises a movable sealing lip, a static sealing lip and an energy storage spring, the energy storage spring is compressed and located between the movable sealing lip and the static sealing lip, the movable sealing lip is attached to the rod, and the static sealing lip is attached to the inner wall of the cylinder barrel.
Preferably, the number of the first flooding plugs is plural.
Preferably, the locking nut is in threaded connection with the rod piece and the cylinder barrel.
Preferably, the distance between the first flooding plug and the packing pad is variable.
Preferably, the number of the second O-rings is plural.
Preferably, the flooding plug comprises a U-shaped non-metal jacket, the two U-shaped walls of the U-shaped non-metal jacket are respectively the dynamic sealing lip and the static sealing lip, and the U-shaped non-metal jacket is made of a high-performance non-metal polymer material.
Preferably, the energy storage spring is made of a corrosion resistant material.
In conclusion, the multilayer serial sealing system provided by the invention has good overall sealing performance and wide application range, and can be used for various complex working conditions such as no pressure, micro pressure, high pressure, ultralow temperature, high temperature and the like; in addition, the flooding plug seal and the like have the characteristic of automatic abrasion compensation, so that the sealing system has long service life; finally, the invention forms a sealing system by connecting a plurality of sealing structures in series in a proper redundancy way, so that the whole sealing system has the characteristics of strong adaptability, high reliability and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic view of a multi-layer in-line sealing system according to an embodiment of the present invention;
FIG. 2 is a partially enlarged view of a multi-layer tandem seal system according to an embodiment of the present invention;
FIG. 3 is a schematic view of a flooding plug in a multi-level tandem seal system according to an embodiment of the present invention;
wherein the reference numerals are as follows:
1-a first O-shaped ring, 2-a locking nut, 3-a second universal plug, 4-a packing pressing sleeve, 5-a second O-shaped ring, 6-a packing, 7-a packing pad, 8-a universal plug pad, 9-a first universal plug, 11-a static sealing lip, 12-a dynamic sealing lip and 13-an energy storage spring.
Detailed Description
The multi-level tandem seal system of the present invention is described in further detail below with reference to fig. 1-2 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.
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.
Referring to fig. 1, an embodiment of the present invention provides a multi-layer tandem sealing system, which is used for sealing between a rod and an inner wall of a cylinder, wherein the rod extends out of an opening of the cylinder, and includes a lock nut 2, a first flooding plug 9, a packing pressing sleeve 4, a packing 6, a packing pad 7, a first O-ring 1, and a second O-ring 5, so as to form a multi-layer tandem seal. The locking nut 2 is sleeved on the rod piece and the outer wall of the cylinder barrel, one end of the locking nut 2 is connected with the rod piece, the other end of the locking nut 2 is connected with the outer wall of the cylinder barrel, a nut gap is reserved between the inner wall of the locking nut 2 and the rod piece, the first O-shaped ring 1 is arranged between the locking nut 2 and the rod piece, the locking nut 2 provides a groove for the first O-shaped ring 1, and the first O-shaped ring 1 can be accommodated in the groove to be compressed to achieve O-shaped ring sealing. One part of the packing pressing sleeve 4 is accommodated in the nut gap, the other part of the packing pressing sleeve is arranged in the gap between the rod piece and the inner wall of the cylinder barrel, the second O-shaped rings 5 are arranged between the packing pressing sleeve 4 and the rod piece and between the packing pressing sleeve and the inner wall of the cylinder barrel, and the packing pressing sleeve 4 provides grooves for the second O-shaped rings 5, so that the second O-shaped rings 5 are matched with the packing pressing sleeve 4 to form a micro-leakage sealing structure. The packing pad 7 is arranged in a gap between the rod piece and the inner wall of the cylinder barrel, the packing 6 is arranged between the packing pressing sleeve 4 and the packing pad 7, and the packing pressing sleeve 4, the packing 6 and the packing pad 7 form packing seal. And the clearance between the rod piece and the inner wall of the cylinder barrel is also provided with the first flooding plug 9 to form flooding plug sealing.
In practical terms, referring to the leakage direction in fig. 1, when multiphase flow flows, if an external leakage is desired, the multiphase flow first passes through the first to third sealing structures in sequence. First, a first layer of sealing structure is formed by the first flooding plug 9, and the first flooding plug 9 can prevent a large amount of multiphase flow from leaking (including extreme conditions), and then a little multiphase flow can pass through the first flooding plug 9. A gap exists between the first flooding plug 9 and the packing pad 7, which can be used to reduce the pressure and flow rate of the multiphase flow or weaken the ultra-low temperature/high temperature (i.e. the ultra-low temperature/high temperature returns to normal temperature).
The leaked multiphase flow will then pass through the second layer of sealing structure formed by the three of the packing 6 and the packing mat 7, thereby achieving the zero leakage requirement. After the filler 6 and the filler pad 7 are filled into the filler cavity, the filler 6 is axially compressed through the filler pressing sleeve 4, the rod piece and the filler 6 move relatively, and the filler 6 can generate radial force due to plastic deformation and is fully attached to the rod piece. At the same time, the lubricant in the filler 6 flows out, and an oil film is formed between the contact surfaces. Because the contact parts are not absolutely uniform, labyrinth oil grooves with uneven thickness are formed between the contact surfaces, and the function of preventing liquid flow from leaking is achieved.
If zero leakage fails, leaked multiphase flow passes through the packing pressing sleeve 4 and the second O-shaped ring 5 to form a micro-leakage structure, so that zero leakage is realized. When installed, the second O-ring 5 will initially compress (i.e., substantially conform to the sealed surface) between the sealed surface and the groove, thereby providing the sealing capability of the second O-ring 5.
In the present embodiment, which may fail in the extreme case of the first three-layer seal, and which, with reference to fig. 1, also comprises a second flooding plug 3, the leakage multiphase flow in the extreme case would achieve a forced zero leakage in said second flooding plug 3. The first O-shaped ring 1 and the locking nut 2 form a fifth layer sealing structure, so that external pollution is prevented from entering the interior, the sealing effect on multiphase flow leakage is achieved, and the occurrence probability is extremely low.
In this embodiment, referring to fig. 3, the first flooding plug 9 and the second flooding plug 3 are both pressure-assisted sealing structures composed of a U-shaped non-metallic jacket and an internal energy storage spring 13, wherein the U-shaped non-metallic jacket is processed from a high-performance non-metallic polymeric synthetic material, and the energy storage spring 13 is made from a corrosion-resistant metal. The lip of the U-shaped non-metal jacket contacting the bottom of the groove is called static seal lip 11, and the lip contacting the surface of the rod is dynamic seal lip 12. In the installation process, under the action of an energy storage spring 13 inside the U-shaped nonmetal jacket, two lips of the U-shaped nonmetal jacket are respectively attached to the groove side and the sealed surface, so that multiphase flow sealing can be completed under the non-pressure working condition. When the flow pressure of the multi-phase flow is increased, the dynamic and static sealing lips 11 of the U-shaped non-metal jacket are subjected to the spring force and the pressure of the multi-phase flow, so as to assist sealing. That is, the sealing lip of the U-shaped non-metallic jacket is more sufficiently attached to the groove and the sealed surface as the pressure is higher, thereby achieving high-pressure sealing.
In this embodiment, the first flooding plug 9 is further provided with a flooding plug pad 8, the flooding plug pad 8 is located in a gap between the rod piece and the inner wall of the cylinder, and the flooding plug pad 8 is used for ensuring uniform pressing force.
In this embodiment, when the multi-layer tandem seal system is arranged, the distance between the first flooding plug 9 and the filler seal can be adjusted according to actual working conditions. For example, under the working conditions of ultralow temperature and high temperature, the distance between the first flooding plug 9 and the packing seal is properly increased to relieve the influence of the extreme working conditions on the sealing system.
In this embodiment, the number of the flooding plugs and the number of the O-rings may be increased or decreased according to actual situations, so as to achieve an optimal sealing effect, that is, the number of the first flooding plugs 9 may be multiple, and the number of the second O-rings 5 may also be multiple.
In this embodiment, the locking nut 2 is typically screwed to the rod and the cylinder.
The invention has the advantages of wide application range and can be used for various complex working conditions such as no pressure, micro pressure, high pressure, ultralow temperature, high temperature and the like; in addition, the flooding plug seal and the like have the characteristic of automatic abrasion compensation, so that the sealing system has long service life; finally, the invention forms a sealing system by connecting a plurality of sealing structures in series in a proper redundancy way, so that the whole sealing system has the characteristics of strong adaptability, high reliability and the like.
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 multi-level tandem type sealing system is used for sealing between a rod piece and the inner wall of a cylinder barrel, wherein the rod piece extends out of an opening of the cylinder barrel, and is characterized by comprising a locking nut, a first flooding plug, a second flooding plug, a packing pressing sleeve, packing, a packing pad, a first O-shaped ring and a second O-shaped ring;
the locking nut is sleeved on the rod piece and the outer wall of the cylinder barrel, one end of the locking nut is connected with the rod piece, the other end of the locking nut is connected with the outer wall of the cylinder barrel, a nut gap is reserved between the inner wall of the locking nut and the rod piece, and the first O-shaped ring is arranged between the locking nut and the rod piece;
one part of the packing pressing sleeve is accommodated in the nut gap, the other part of the packing pressing sleeve is arranged in the gap between the rod piece and the inner wall of the cylinder barrel, and the second O-shaped rings are arranged between the packing pressing sleeve and the rod piece and between the packing pressing sleeve and the inner wall of the cylinder barrel;
the packing pad is arranged in a gap between the rod piece and the inner wall of the cylinder barrel, the packing is arranged between the packing pressing sleeve and the packing pad, and a second flooding plug is arranged between the packing pressing sleeve and the rod piece;
and the first flooding plug is also arranged in a gap between the rod piece and the inner wall of the cylinder barrel.
2. The multi-level tandem seal system of claim 1 wherein the first flooding plunger is further provided with a flooding pad, the flooding pad being located in the gap between the rod and the inner wall of the bore.
3. The multi-level tandem seal system according to any of claims 1-3, wherein the flooding plug comprises a dynamic seal lip, a static seal lip, and an energy storage spring, wherein the energy storage spring is compressed and positioned between the dynamic seal lip and the static seal lip, the dynamic seal lip is attached to the rod, and the static seal lip is attached to the inner wall of the cylinder.
4. The multi-level tandem seal system of claim 1, wherein the first flooding plug is plural in number.
5. The multi-level tandem seal system of claim 1, wherein the lock nut is threaded with both the rod and the cylinder.
6. The multi-level tandem seal system of claim 1, wherein a distance between the first flooding plug and the gasket is variable.
7. The multi-level tandem seal system of claim 1, wherein the number of the second O-rings is plural.
8. The multi-level tandem seal system of claim 4, wherein the flooding plug comprises a U-shaped non-metallic jacket, the two U-shaped walls of the U-shaped non-metallic jacket being the dynamic seal lip and the static seal lip, respectively, the U-shaped non-metallic jacket being fabricated from a high performance non-metallic polymer material.
9. The multi-level tandem seal system of claim 9, wherein the energy storage spring is made of a corrosion resistant material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111211697.3A CN114033576A (en) | 2021-10-18 | 2021-10-18 | Multi-layer tandem sealing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111211697.3A CN114033576A (en) | 2021-10-18 | 2021-10-18 | Multi-layer tandem sealing system |
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| Publication Number | Publication Date |
|---|---|
| CN114033576A true CN114033576A (en) | 2022-02-11 |
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| CN202111211697.3A Pending CN114033576A (en) | 2021-10-18 | 2021-10-18 | Multi-layer tandem sealing system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4558874A (en) * | 1983-07-05 | 1985-12-17 | Whitey Co. | Valve stem packing assembly |
| CN204756133U (en) * | 2015-06-23 | 2015-11-11 | 江苏神通阀门股份有限公司 | Low -temp stop valve |
| CN208719056U (en) * | 2018-08-15 | 2019-04-09 | 安徽士必达液压器材有限公司 | A kind of anti abrasive high-pressure cylinder of high sealing |
| CN111022665A (en) * | 2019-12-31 | 2020-04-17 | 天津富赛克流体控制设备有限公司 | Adjustable shaft hole sealing packing 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 |
| CN211010130U (en) * | 2019-12-05 | 2020-07-14 | 四川良川机械设备有限公司 | Upper sealing structure of low-temperature valve stuffing box |
| CN112240428A (en) * | 2020-10-14 | 2021-01-19 | 上海沪东造船阀门有限公司 | Composite packing sealing structure |
-
2021
- 2021-10-18 CN CN202111211697.3A patent/CN114033576A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4558874A (en) * | 1983-07-05 | 1985-12-17 | Whitey Co. | Valve stem packing assembly |
| CN204756133U (en) * | 2015-06-23 | 2015-11-11 | 江苏神通阀门股份有限公司 | Low -temp stop valve |
| CN208719056U (en) * | 2018-08-15 | 2019-04-09 | 安徽士必达液压器材有限公司 | A kind of anti abrasive high-pressure cylinder of high sealing |
| CN211010130U (en) * | 2019-12-05 | 2020-07-14 | 四川良川机械设备有限公司 | Upper sealing structure of low-temperature valve stuffing box |
| CN111022665A (en) * | 2019-12-31 | 2020-04-17 | 天津富赛克流体控制设备有限公司 | Adjustable shaft hole sealing packing 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 |
| CN112240428A (en) * | 2020-10-14 | 2021-01-19 | 上海沪东造船阀门有限公司 | Composite packing sealing structure |
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