CN114857271A - Contact finger sealing structure - Google Patents
Contact finger sealing structure Download PDFInfo
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- CN114857271A CN114857271A CN202210519125.XA CN202210519125A CN114857271A CN 114857271 A CN114857271 A CN 114857271A CN 202210519125 A CN202210519125 A CN 202210519125A CN 114857271 A CN114857271 A CN 114857271A
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- Prior art keywords
- sealing
- finger
- seal
- assembly
- cylindrical
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- 238000007789 sealing Methods 0.000 title claims abstract description 133
- 238000003825 pressing Methods 0.000 claims abstract description 9
- 230000006835 compression Effects 0.000 claims description 12
- 238000007906 compression Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 3
- 238000002679 ablation Methods 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 abstract description 2
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- 239000002737 fuel gas Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 abstract description 2
- 238000010030 laminating Methods 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
-
- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
-
- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3268—Mounting of sealing rings
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gasket Seals (AREA)
Abstract
The invention provides a contact finger sealing structure which comprises a sealing assembly, a sealing pair, a pressing assembly and an outer supporting ring, wherein the sealing assembly is of a cylindrical structure, a plurality of spirally arranged gaps are formed in the cylindrical surface, and a sealing finger body is arranged between every two adjacent gaps. This touch and indicate seal structure reduces the sealed gas and lets out the leakage quantity, reduces the frictional wear between sealing boot and the terminal surface and improves sealed high temperature resistance performance the time, ingenious with seal structure and bearing structure combine together, through the flexibility and the elasticity of bent roof beam strengthened the laminating nature between sealing boot and the terminal surface. The sealing device has the advantages that the sealing device has the effect of blowing off high-temperature air or fuel gas through slight leakage of sealing, avoids ablation of parts, simultaneously reduces the influence of structural stress and high-temperature creep on performance attenuation, ensures sealing reliability in long-time use and repeated decomposition and reassembly, enables a metal sealing ring which is usually used for a high-temperature casing matching surface to be replaced, and greatly enhances the overall reliability of the structure.
Description
Technical Field
The invention belongs to the technical field of aero-engines, and particularly relates to a contact finger sealing structure.
Background
With the increasing improvement of the performance of the aero-engine, the working conditions of a sealing structure in the engine are increasingly severe due to the increase of thermodynamic cycle parameters and the reduction of structural rigidity, the improvement of the performance of the sealing structure is imperative, and the requirement of the engine cannot be met by adopting the traditional labyrinth seal under the working conditions of high temperature, high pressure and high speed. Therefore, in the past 20 years, the trend of replacing the labyrinth seal by the flexible seal is shown, and the fingertip seal is taken as a novel flexible sealing technology, has excellent sealing performance and lower manufacturing cost, and is widely concerned and deeply researched by domestic and foreign seal researchers.
The fingertip seal is generally a pressure balance type fingertip seal structure at present to improve the hysteresis effect of the fingertip seal. The invention patent (US6811154B2) using a "pressure balance chamber" was disclosed in 2004 abroad to achieve the objective of reducing the "hysteresis effect" by reducing the axial pressure difference acting on the finger tips. The national institute of gas turbines in Sichuan of Aero-development filed an invention patent of 'a fingertip seal structure and a rear baffle thereof' (ZL 200910260097.9). The structure reduces the hysteresis effect and the air leakage along the rear baffle plate by arranging a plurality of specially-structured pressure equalizing grooves on the rear baffle plate. Similar methods for improving fingertip seal hysteresis through pressure balance are also shown in the invention patent of "a rear baffle non-contact fingertip seal structure with micropore texture" (ZL201510156112.0) and the invention patent of "a low hysteresis contact fingertip seal with fins" (ZL201610878878.4) of Qinghua university.
However, the existing fingertip sealing structure is based on an integral structure, the fingertip sealing performance is improved by adjusting the molded line of a fingertip beam, the shape of a fingertip sheet and the structure of a rear baffle, and the fingertip sealing structure belongs to a passive adaptive sealing structure and cannot actively intervene and control the sealing performance.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a radial stacked contact finger sealing scheme with high temperature and high pressure resistance, so as to significantly improve the working capacity and sealing performance of the secondary flow path seal and provide an efficient axial gap seal.
In order to achieve the above object, the present invention provides a contact finger sealing structure, which includes a sealing assembly, a sealing pair, a pressing assembly and an outer support ring, wherein the sealing assembly is radially stacked, the sealing pair is matched with the sealing assembly, the pressing assembly is used for pressing a sealing sheet, and the outer support ring is used for supporting the sealing sheet.
The contact finger sealing structure provided by the invention is also characterized in that the sealing assembly is a multi-layer cylindrical structure formed by concentrically sleeving a plurality of cylindrical sealing sheets or rolling a single sealing sheet.
The contact finger sealing structure provided by the invention is also characterized in that the gaps on the adjacent sealing sheets on the plurality of sealing sheets with the cylindrical structures are arranged in a staggered manner.
The contact finger sealing structure provided by the invention is also characterized in that the gap of each sealing sheet is positioned at the center of the sealing finger body of the adjacent sealing sheet.
The contact finger sealing structure provided by the invention is also characterized in that the gap on each layer of the multilayer cylindrical structure is staggered with the gap on the adjacent layer.
The contact finger sealing structure provided by the invention is also characterized in that the spirally arranged gap is positioned in the middle of the body of the sealing finger on the cylindrical structure of the adjacent layer.
The finger seal structure provided by the present invention is further characterized in that the spiral includes one selected from a cylindrical arc spiral, an involute spiral, and a multi-segment line spiral.
The contact finger sealing structure provided by the invention also has the characteristic that the sealing component is made of a metal material or a composite material.
The contact finger sealing structure provided by the invention also has the characteristics that the sealing pair can be a single-side sealing pair arranged at one end of the sealing assembly, and also can be a double-side sealing pair arranged at two ends of the sealing assembly; when the unilateral is sealed vice, the other end of seal assembly passes through the interior support ring to be fixed.
The contact finger sealing structure provided by the invention is also characterized in that the compression assembly comprises a protection collar and a compression ring, and the compression ring is used for compressing the sealing assembly; the protection clamping ring is used for fixing the compression ring.
The contact finger sealing structure provided by the invention is also characterized in that the outer supporting ring is provided with an annular or arc-shaped pressure balancing cavity.
Advantageous effects
The contact finger sealing structure provided by the invention has better sealing performance while reducing the leakage amount of sealing gas, reducing the frictional wear between the sealing shoe and the end face and improving the high-temperature resistance of sealing, skillfully avoids a large wear and a large clearance structure, enhances the fitting property between the sealing shoe and the end face through the flexibility and elasticity of the curved beam, thereby reducing the leakage amount and the load at the bottom of the sealing shoe, reducing the collision and wear between the sealing shoe and the end face, replacing the end face labyrinth seal commonly used for a secondary flow path, and greatly reducing the leakage amount and the wear amount.
Drawings
Fig. 1 is a schematic view of an assembly structure of a contact finger sealing structure applied to an air flow path seal according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an assembly employing a finger seal structure according to an embodiment of the present invention;
FIG. 3 is a schematic view of the structure of FIG. 2 showing the beams shielded from each other;
FIG. 4 is a schematic structural diagram of a single sealing piece in a finger seal structure provided by an embodiment of the invention;
FIG. 5 is an enlarged end view of FIG. 4;
FIG. 6 is a schematic structural view of a seal assembly according to some embodiments of the present invention;
FIG. 7 is a schematic view of a sealed finger body provided in accordance with some embodiments of the present invention;
fig. 8 is a schematic view of a sealed finger body provided in accordance with some embodiments of the present invention.
Detailed Description
The present invention is further described in detail with reference to the drawings and examples, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functional, methodological, or structural equivalents of these embodiments or substitutions may be included in the scope of the present invention.
In the description of the embodiments of the present invention, it should be understood that the terms "central", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only used for convenience in describing and simplifying the description of the present invention, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; 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 creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Although the characteristics of the engine impeller parts are affected by manufacturing process, working environment, service time and the like, the basic change trend of the characteristics has the characteristic of keeping the trend, the shape and the like of the characteristic line basically unchanged, and an important theoretical basis is provided for characteristic correction of the impeller parts according to engine test run data.
As shown in fig. 1 to 8, the present embodiment provides a contact finger sealing structure, where the contact finger sealing structure includes a sealing assembly 1, a sealing pair 2 matched with the sealing assembly, a pressing assembly for pressing a sealing sheet, and an outer support ring 6 for supporting, where the sealing assembly 1 is a cylindrical structure, a plurality of spirally arranged gaps are arranged on a cylindrical surface of the cylindrical sealing assembly 1, and a sealing finger body is arranged between two adjacent gaps. The laminated sealing sheet structure is used for sealing an air flow path, and the friction pair 2 is used for sealing air.
In the embodiment, the sealing structure and the supporting structure are ingeniously integrated, and the joint between the sealing boot and the end face is enhanced through the flexibility and the elasticity of the curved beam. The sealing device has the advantages that the sealing device has the effect of blowing off high-temperature air or fuel gas through slight leakage of sealing, avoids ablation of parts, simultaneously reduces the influence of structural stress and high-temperature creep on performance attenuation, ensures sealing reliability in long-time use and repeated decomposition and reassembly, enables a metal sealing ring which is usually used for a high-temperature casing matching surface to be replaced, and greatly enhances the overall reliability of the structure.
In some embodiments, the sealing assembly 1 is a multi-layer cylindrical structure formed by concentrically sleeving a plurality of cylindrical sealing sheets or by rolling a single sealing sheet.
In some embodiments, the slits on adjacent sealing sheets on the plurality of sealing sheets of the cylindrical structure are staggered. The staggered gaps can achieve the effect of axial sealing.
In some embodiments, the seam of each sealing panel is located at the center of the sealing finger body of the adjacent sealing panel.
In some embodiments, the gaps on each layer of the multi-layer cylindrical structure are staggered with the gaps on the adjacent layer.
In some embodiments, the spirally disposed slit is located at a seal finger center position on the cylindrical structure of the adjacent layer.
In some embodiments, the spiral comprises one selected from a cylindrical circular arc spiral, an involute spiral, and a multi-segment spiral.
In some embodiments, the seal assembly 1 is made of a metallic material or a composite material.
In some embodiments, the sealing pair may be a single-side sealing pair disposed at only one end of the sealing assembly 1, or may be a double-side sealing pair disposed at two ends of the sealing assembly 1; when the single-side sealing pair is used, the other end of the sealing component is fixed through the inner support ring 5. The inner support ring 5 supports and protects the laminated seal plate assembly 1, while the inner support ring 5 has a rear end face which cooperates with the seal plate assembly 1 for sealing.
In some embodiments, the compression assembly comprises a protection collar 3 and a compression ring 4, wherein the compression ring 4 is used for compressing the sealing assembly 1; the protective collar 3 serves to fix the clamping ring 4. The clamp ring 4 is also an annular plate-shaped structure and mainly used for supporting and protecting the seal assembly 1. A protective collar 3 secures the compression ring 4 to the outer support ring 6.
In some embodiments, the outer support ring 6 is provided with an annular or arc-shaped pressure balance cavity. The outer support ring 6 supports the compression ring 4.
In some embodiments, the outside and inside of the seal assembly 1 may be used to encase a thin-walled metal sleeve for increased rigidity and protection in small diameter or axially large span conditions.
In some embodiments, the sealing finger body of the sealing plate can be adjusted according to actual working conditions, and fig. 7 and 8 respectively show different variants of sealing finger bodies.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (11)
1. A contact finger sealing structure is characterized by comprising a sealing component, a sealing pair, a pressing component and an outer supporting ring, wherein the sealing component is radially stacked, the sealing pair is matched with the sealing component, the pressing component is used for pressing a sealing sheet, and the outer supporting ring is used for supporting,
the sealing assembly is of a cylindrical structure, a plurality of spirally arranged gaps are formed in the cylindrical surface of the cylindrical sealing assembly, and a sealing finger body is arranged between every two adjacent gaps.
2. The contact finger sealing structure according to claim 1, wherein the sealing assembly is a multi-layer cylindrical structure formed by concentrically sleeving a plurality of cylindrical sealing sheets or rolling a single sealing sheet.
3. The finger seal structure of claim 2, wherein the slits on adjacent seal pieces on the plurality of cylindrical seal pieces are offset.
4. The finger seal structure of claim 3, wherein the slit of each sealing flap is located at a midpoint of the sealing finger body of the adjacent sealing flap.
5. The finger seal structure of claim 2, wherein the slits in each layer of the multi-layer cylindrical structure are offset from the slits in the adjacent layer.
6. The finger seal structure of claim 5, wherein the helically arranged slits are located at a seal finger midpoint on the cylindrical structure of an adjacent layer.
7. The finger seal structure of claim 1, wherein said spiral comprises one selected from the group consisting of a cylindrical circular arc spiral, an involute spiral, and a multi-segment line spiral.
8. The finger seal structure of claim 1, wherein the seal assembly is made of a metallic material or a composite material.
9. The contact finger sealing structure according to claim 1, wherein the sealing pair can be a single-side sealing pair arranged at one end of the sealing assembly, or can be a double-side sealing pair arranged at two ends of the sealing assembly; when the unilateral is sealed vice, the other end of seal assembly passes through the interior support ring to be fixed.
10. The finger seal arrangement of claim 1, wherein the compression assembly includes a protective collar and a compression ring for compressing the seal assembly; the protection clamping ring is used for fixing the compression ring.
11. The contact finger sealing structure according to claim 1, wherein the outer support ring is provided with an annular or arc-shaped pressure balance cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210519125.XA CN114857271A (en) | 2022-05-12 | 2022-05-12 | Contact finger sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210519125.XA CN114857271A (en) | 2022-05-12 | 2022-05-12 | Contact finger sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114857271A true CN114857271A (en) | 2022-08-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210519125.XA Pending CN114857271A (en) | 2022-05-12 | 2022-05-12 | Contact finger sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114857271A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6196550B1 (en) * | 1999-02-11 | 2001-03-06 | Alliedsignal Inc. | Pressure balanced finger seal |
| CN102518477A (en) * | 2011-12-31 | 2012-06-27 | 中国燃气涡轮研究院 | Finger sealing device |
| US20130149143A1 (en) * | 2011-12-12 | 2013-06-13 | Honeywell International Inc. | Gas turbine engine including lift-off finger seals, lift-off finger seals, and method for the manufacture thereof |
| CN104864102A (en) * | 2015-04-03 | 2015-08-26 | 清华大学 | Non-contact fingertip seal device with rear baffle adopting micropore texture |
| CN106948873A (en) * | 2017-04-07 | 2017-07-14 | 中国航发沈阳发动机研究所 | Seal structure between stators part |
| CN111765115A (en) * | 2020-06-03 | 2020-10-13 | 南京工程学院 | Fingertip type dry gas sealing device |
| CN114151204A (en) * | 2021-10-20 | 2022-03-08 | 中国航发四川燃气涡轮研究院 | Fingertip piece and fingertip sealing structure |
-
2022
- 2022-05-12 CN CN202210519125.XA patent/CN114857271A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6196550B1 (en) * | 1999-02-11 | 2001-03-06 | Alliedsignal Inc. | Pressure balanced finger seal |
| US20130149143A1 (en) * | 2011-12-12 | 2013-06-13 | Honeywell International Inc. | Gas turbine engine including lift-off finger seals, lift-off finger seals, and method for the manufacture thereof |
| CN102518477A (en) * | 2011-12-31 | 2012-06-27 | 中国燃气涡轮研究院 | Finger sealing device |
| CN104864102A (en) * | 2015-04-03 | 2015-08-26 | 清华大学 | Non-contact fingertip seal device with rear baffle adopting micropore texture |
| CN106948873A (en) * | 2017-04-07 | 2017-07-14 | 中国航发沈阳发动机研究所 | Seal structure between stators part |
| CN111765115A (en) * | 2020-06-03 | 2020-10-13 | 南京工程学院 | Fingertip type dry gas sealing device |
| CN114151204A (en) * | 2021-10-20 | 2022-03-08 | 中国航发四川燃气涡轮研究院 | Fingertip piece and fingertip sealing structure |
Non-Patent Citations (1)
| Title |
|---|
| 郎达学;苏华;: "表面织构靴底流体动压指尖密封的性能分析" * |
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Application publication date: 20220805 |
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