CN114877071B - Fingertip sealing structure with contact finger and processing method thereof - Google Patents
Fingertip sealing structure with contact finger and processing method thereof Download PDFInfo
- Publication number
- CN114877071B CN114877071B CN202210519124.5A CN202210519124A CN114877071B CN 114877071 B CN114877071 B CN 114877071B CN 202210519124 A CN202210519124 A CN 202210519124A CN 114877071 B CN114877071 B CN 114877071B
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- finger
- contact finger
- contact
- seal
- fingertip
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
- Gasket Seals (AREA)
Abstract
The invention provides a fingertip sealing structure with a contact finger plate and a processing method thereof. The fingertip seal with the finger touch sheet and the processing method thereof can solve the problem of fitting of the fingertip sheet, realize the control of the inner diameter of the fingertip seal with high roundness and accurate size, break through the limitation of the size of the fingertip seal material on the application range of the fingertip seal, greatly reduce the manufacturing cost of the fingertip seal and obviously improve the sealing performance of the fingertip seal.
Description
Technical Field
The invention belongs to the technical field of aeroengines, and particularly relates to a fingertip sealing structure with a contact finger piece and a processing method thereof.
Background
With the increasing performance of aeroengines, the increasing thermal cycle parameters and the decreasing structural rigidity of aeroengines make the working conditions of sealing devices in engines worse, and the performance of the sealing devices is imperative to be improved, and the requirements of the engines cannot be met by adopting traditional comb tooth sealing under the working conditions of high temperature, high pressure and high speed. Therefore, in the past 20 years, the trend of replacing the comb tooth seal by the flexible seal is shown, and the fingertip seal is taken as a novel flexible seal technology, so that the excellent sealing performance and the lower manufacturing cost of the novel flexible seal technology are widely and intensively studied by seal researchers at home and abroad.
The design work of fingertip seals has been focused on how to keep the gap between the fingertip and the rotor at a proper value during operation, which requires comprehensive consideration of the "stiffening effect", "hysteresis effect" and "blow-down effect" of the fingertip seal. In order to inhibit the rigidification effect and the hysteresis effect, a pressure balance structure is generally adopted at home and abroad to achieve the aim by reducing the axial pressure difference acted on the fingertip sheet, such as a pressure balance cavity invention patent (US 6811154B 2), a fingertip seal structure and a rear baffle thereof invention patent (ZL 200910260097.9), a rear baffle microporous texture non-contact fingertip seal device invention patent (ZL 201510156112.0) and the like.
But at present, the sealing performance, namely the follow-up performance and the fitting performance of the fingertip seal are rarely improved from the technical point of view. The fingertip seal with the existing structure has two important problems in the technical aspect, namely, the flatness of the fingertip sheet is not ideal, particularly, the axial warping of the fingertip sheet with large size is obvious, the fingertip sheet cannot be well attached due to the warping, and clamping stagnation is easy to generate; secondly, the position degree of the seal boot of the fingertip sheet cannot reach an ideal state, so that the clearance or interference state of a seal interface is uncontrolled, and unexpected abrasion is easy to generate.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a structure capable of solving the problem of fitting of fingertip sheets so as to realize the control of the fingertip seal inner diameter with high roundness and accurate size and break through the limitation of the fingertip seal material size on the application range of fingertip seal.
In order to achieve the above purpose, the invention provides a fingertip sealing structure with a contact finger, the sealing structure comprises a support piece, a plurality of contact finger pieces and a pressing plate, wherein the support piece is provided with a plurality of grooves for installing the contact finger pieces, and the pressing plate is used for fixing the contact finger pieces in the grooves of the support piece.
The fingertip sealing structure with the contact finger piece provided by the invention has the characteristics that the supporting piece is of an annular structure, the annular section is r-shaped, and the end face is provided with an omega-shaped groove for connecting the contact finger piece.
The fingertip sealing structure with the contact finger piece provided by the invention is also characterized in that the contact finger piece is a thin sheet with a Z shape and is provided with an omega-shaped bulge, and the omega-shaped bulge is matched with an omega-shaped groove on the supporting plate.
The fingertip sealing structure with the contact finger plates provided by the invention has the characteristics that the grooves of the supporting piece are internally provided with the multi-layer contact finger plates, and gaps between adjacent contact finger plates of each layer are covered by the contact finger plates of the adjacent layers.
The fingertip sealing structure with the contact finger plate provided by the invention is also characterized in that the product of the inner diameter width H1 and the outer diameter curvature R2 of the contact finger plate is the same as the product of the outer diameter width H2 and the inner diameter curvature R1.
The fingertip sealing structure with the contact finger plate provided by the invention has the characteristics that the contact finger plate is made of one material selected from metal, carbon graphite, carbon fiber composite material and rubber plastic material.
Another object of the present invention is to provide a method for manufacturing a fingertip seal structure with a contact finger according to any one of the above, the method comprising the steps of:
s1: cutting out a plurality of identical contact finger sheets;
s2: splicing the contact finger sheets obtained in the step S1 into omega-shaped grooves on a supporting plate, and spacing one omega-shaped groove between every two adjacent contact finger sheets to form a first layer of seal;
s3: after the first layer of seal is formed in the S2, splicing the contact finger sheets in the vacant omega-shaped grooves to form a second layer of seal;
s4: repeating the steps S2-S3 to obtain multi-layer sealing;
s5: clamping the contact finger piece and processing the inner diameter of the contact finger piece;
s6: and clamping the finger contact sheet by using a pressing plate to obtain the fingertip sealing structure with the finger contact sheet.
The processing method provided by the invention also has the characteristic that the number of layers of the multi-layer seal is 3-15.
The processing method provided by the invention is characterized in that the surface roughness of the contact finger is not more than Ra0.4, and the end surface roughness of the supporting plate contacted with the contact finger is not more than Ra0.2.
The processing method provided by the invention is also characterized in that the roundness of the inner diameter of the contact finger is not more than 0.01mm, and the roughness is not more than Ra0.4.
Advantageous effects
The fingertip seal with the finger touch sheet and the processing method thereof can solve the problem of fitting of the fingertip sheet, realize the control of the inner diameter of the fingertip seal with high roundness and accurate size, break through the limitation of the size of the fingertip seal material on the application range of the fingertip seal, greatly reduce the manufacturing cost of the fingertip seal and obviously improve the sealing performance of the fingertip seal.
Compared with the existing fingertip seal, the fingertip seal performance of the invention is obviously improved. Firstly, the contact fingers are independently processed and can be combined according to any diameter, so that the difficult problem of sealing and processing of large-diameter fingertips is solved; secondly, the contact finger can be small in size, so that the material loss is reduced, and the cost can be greatly reduced; thirdly, the buckle structure and the combined post-processing can ensure that the sealing diameter of the fingertip seal is determined according to the final requirement, and the problems that the inner diameter of the fingertip plate of the existing fingertip seal is out of round, eccentric and the like are solved, so that the leakage rate of the fingertip seal is reduced.
Drawings
Fig. 1 is a schematic diagram of a fingertip seal structure with a contact finger according to an embodiment of the present invention;
FIG. 2 is a schematic view of a support plate according to an embodiment of the present invention;
fig. 3 is a schematic view of a finger pad structure according to an embodiment of the present invention;
fig. 4 is a schematic diagram of finger processing S1 according to an embodiment of the present invention;
fig. 5 is a schematic diagram of finger processing S2 according to an embodiment of the present invention;
fig. 6 is a schematic diagram of processing S3 of a finger pad according to an embodiment of the present invention
Fig. 7 is a schematic diagram of finger processing S5 according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, but it should be understood that these embodiments are not limiting, and functional, method, or structural equivalents or alternatives according to these embodiments are within the scope of protection of the present invention.
In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the 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 a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication 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 in a specific case.
As shown in fig. 1 to 6, the present embodiment provides a fingertip sealing structure with a contact finger, the sealing structure includes a support member 2, a plurality of contact finger 3, and a pressing plate 1, the support member 2 is provided with a plurality of grooves 5 for mounting the contact finger 3, and the pressing plate 1 is used for fixing the contact finger 3 in the grooves 5 of the support member.
In some embodiments, the supporting member 2 has a ring-shaped structure, the ring-shaped cross section is r, and the end surface is provided with an omega-shaped groove 5 for connecting with the contact finger.
In some embodiments, the finger tab 3 is a thin sheet with a shape of "Z", and has an "Ω" shaped protrusion 6, and the "Ω" shaped protrusion 6 is matched with an "Ω" shaped groove 5 on the support plate.
In some embodiments, a plurality of layers of contact finger sheets 3 are arranged in the support member groove 5, and gaps between adjacent contact finger sheets 3 of each layer are covered by contact finger sheets of adjacent layers.
In some embodiments, the product of the inner diameter width H1 and the outer diameter curvature R2 of the finger tab 3 is the same as the product of the outer diameter width H2 and the inner diameter curvature R1.
In some embodiments, the contact finger 3 is made of a material selected from metal, carbon graphite, carbon fiber composite, and rubber-plastic material.
In some embodiments, there is provided a method for processing the fingertip seal structure with the contact finger sheet according to any one of the preceding claims, the method comprising the steps of:
s1: cutting a plurality of identical contact finger sheets 3 on the same plate;
s2: splicing the contact finger sheets 3 obtained in the step S1 into omega-shaped grooves 5 on the supporting plate 2, and spacing one omega-shaped groove 5 between every two adjacent contact finger sheets 3 to form a first layer of seal;
s3: after the first layer of seal is formed in the S2, splicing the contact finger pieces 3 in the vacant omega-shaped grooves 5 to form a second layer of seal;
s4: repeating the steps S2-S3 to obtain multi-layer sealing;
s5: clamping the contact finger sheet 3, and processing the contact finger 7 part of the contact finger sheet 3 to ensure the roundness and coaxiality of the inner diameter; processing to a desired size by turning, grinding or laser processing;
s6: the finger contact sheet 3 is clamped by the pressing plate 1, and the fingertip sealing structure with the finger contact sheet is obtained.
In some embodiments, the number of layers of the multi-layer seal is 3-15.
In some embodiments, the surface roughness of the finger tab is not greater than ra0.4, and the end surface roughness of the support plate contacting the finger tab is not greater than ra0.2.
In some embodiments, the finger tab has an inner diameter roundness of no greater than 0.01mm and a roughness of no greater than Ra0.4.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (8)
1. A fingertip sealing structure with a contact finger plate is characterized in that the sealing structure comprises a supporting piece, a plurality of contact finger plates and a pressing plate, wherein the supporting piece is provided with a plurality of grooves for installing the contact finger plates, the pressing plate is used for fixing the contact finger plates in the grooves of the supporting piece,
the supporting piece is of an annular structure, the cross section of the annular structure is Gamma, the supporting piece groove is arranged on the end face of the annular structure, the supporting piece groove is an omega-shaped groove,
the contact finger sheet is a thin sheet with a Z shape, and is provided with an omega-shaped bulge which is matched with an omega-shaped groove on the supporting piece.
2. The finger tip sealing structure with finger tabs according to claim 1, wherein a plurality of layers of finger tabs are provided in the support member groove, and a gap between adjacent finger tabs of each layer is covered by the finger tabs of the adjacent layer.
3. The finger tip seal with finger tab of claim 1, wherein the product of the finger tab inner diameter width H1 and the outer diameter curvature R2 is the same as the product of the outer diameter width H2 and the inner diameter curvature R1.
4. The finger tip sealing structure with finger tab according to claim 1, wherein the finger tab is made of a material selected from the group consisting of metal, carbon graphite, carbon fiber composite material and rubber-plastic material.
5. A method of manufacturing a finger seal with a contact finger according to any one of claims 1 to 4, comprising the steps of:
s1: cutting out a plurality of identical contact finger sheets;
s2: splicing the contact finger sheets obtained in the step S1 into omega-shaped grooves on the supporting piece, and spacing one omega-shaped groove between every two adjacent contact finger sheets to form a first layer of seal;
s3: after the first layer of seal is formed in the S2, splicing the contact finger sheets in the vacant omega-shaped grooves to form a second layer of seal;
s4: repeating the steps S2-S3 to obtain multi-layer sealing;
s5: clamping the contact finger piece and processing the inner diameter of the contact finger piece;
s6: and clamping the finger contact sheet by using a pressing plate to obtain the fingertip sealing structure with the finger contact sheet.
6. The process of claim 5 wherein the number of layers of the multi-layer seal is 3-15.
7. The method of claim 5, wherein the surface roughness of the contact finger is no greater than ra0.4 and the end surface roughness of the support in contact with the contact finger is no greater than ra0.2.
8. The method of claim 5, wherein the finger tab has an inside diameter roundness of no greater than 0.01mm and a roughness of no greater than ra0.4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210519124.5A CN114877071B (en) | 2022-05-12 | 2022-05-12 | Fingertip sealing structure with contact finger and processing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210519124.5A CN114877071B (en) | 2022-05-12 | 2022-05-12 | Fingertip sealing structure with contact finger and processing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114877071A CN114877071A (en) | 2022-08-09 |
| CN114877071B true CN114877071B (en) | 2023-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210519124.5A Active CN114877071B (en) | 2022-05-12 | 2022-05-12 | Fingertip sealing structure with contact finger and processing method thereof |
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Citations (8)
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| JP2009216168A (en) * | 2008-03-10 | 2009-09-24 | Nok Corp | Sealing device and its manufacturing method |
| CN202140119U (en) * | 2011-06-16 | 2012-02-08 | 中航商用航空发动机有限责任公司 | Sealing fin and radial sealing device |
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| JP2019173724A (en) * | 2018-03-29 | 2019-10-10 | 三菱日立パワーシステムズ株式会社 | Shaft seal device and rotating machine having shaft seal device |
| CN111306304A (en) * | 2020-03-25 | 2020-06-19 | 西安丁杰精密机械制造有限责任公司 | Rotary-vane type high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device and preparation method |
| CN210890079U (en) * | 2019-09-27 | 2020-06-30 | 深圳市骏和高科技有限公司 | Column type force sensor |
| EP3822522A1 (en) * | 2019-11-12 | 2021-05-19 | WABCO Europe BVBA | Lip seal for a pneumatic valve |
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| US9506566B2 (en) * | 2013-10-23 | 2016-11-29 | Honeywell International Inc. | Finger-foil seals and gas turbine engines employing the same |
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| JP2009216168A (en) * | 2008-03-10 | 2009-09-24 | Nok Corp | Sealing device and its manufacturing method |
| CN202140119U (en) * | 2011-06-16 | 2012-02-08 | 中航商用航空发动机有限责任公司 | Sealing fin and radial sealing device |
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| CN104864764A (en) * | 2015-05-07 | 2015-08-26 | 四川东能节能技术有限公司 | Bypass mutual-lock sealing structure for air pre-heater |
| JP2019173724A (en) * | 2018-03-29 | 2019-10-10 | 三菱日立パワーシステムズ株式会社 | Shaft seal device and rotating machine having shaft seal device |
| CN210890079U (en) * | 2019-09-27 | 2020-06-30 | 深圳市骏和高科技有限公司 | Column type force sensor |
| EP3822522A1 (en) * | 2019-11-12 | 2021-05-19 | WABCO Europe BVBA | Lip seal for a pneumatic valve |
| CN111306304A (en) * | 2020-03-25 | 2020-06-19 | 西安丁杰精密机械制造有限责任公司 | Rotary-vane type high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device and preparation method |
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| CN114877071A (en) | 2022-08-09 |
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