CN111120113B - Gas turbine and non-contact fingertip sealing device thereof - Google Patents
Gas turbine and non-contact fingertip sealing device thereof Download PDFInfo
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- CN111120113B CN111120113B CN201811277811.0A CN201811277811A CN111120113B CN 111120113 B CN111120113 B CN 111120113B CN 201811277811 A CN201811277811 A CN 201811277811A CN 111120113 B CN111120113 B CN 111120113B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/28—Arrangement of seals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
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Abstract
The invention discloses a gas turbine and a non-contact fingertip sealing device thereof, wherein the non-contact fingertip sealing device comprises a front baffle, a high-pressure fingertip sheet, a low-pressure fingertip sheet and a rear baffle which are sequentially connected from a high-pressure side to a low-pressure side, a groove is formed in the high-pressure end of the rear baffle so as to form a pressure balance cavity between the low-pressure fingertip sheet and the rear baffle and divide the high-pressure end face of the rear baffle into an inner high-pressure end face and an outer high-pressure end face, and a part of the inner high-pressure end face is spaced from the low-pressure fingertip sheet. The non-contact fingertip sealing device can reduce or even eliminate the hysteresis effect and improve the sealing performance.
Description
Technical Field
The invention relates to the technical field of gas turbines, in particular to a gas turbine and a non-contact fingertip sealing device thereof.
Background
Fingertip seals are used in aircraft engines and/or gas turbines due to their long life, low leakage, etc. The fingertip seal comprises a front baffle, a fingertip sheet and a rear baffle, friction force exists between the fingertip sheet and the rear baffle, hysteresis effect is easy to generate, and the sealing performance of the fingertip seal is affected.
Document US6811154B2 discloses a fingertip seal having a pressure balance cavity, which reduces the axial pressure differential acting directly on the fingertip sheet to reduce friction and thus hysteresis.
Document CN104864102 discloses a non-contact fingertip sealing device, in which a rear baffle is provided with a micro-porous texture, and by using the fluid dynamic pressure and fluid static pressure effect generated by the micro-porous texture, the bearing capacity of a fluid film between a fingertip sheet and the rear baffle is improved, and the hysteresis effect of the non-contact fingertip sealing is reduced.
However, document US6811154B2 takes the form of a pressure balancing chamber, and has a limited effect of reducing the hysteresis effect at higher operating pressures. In the document CN104864102, in the form of providing the micro-porous texture, although the fluid dynamic pressure and the fluid static pressure effect generated by the micro-porous texture can be utilized to improve the bearing capacity of the fluid film between the finger tip sheet and the back plate, so as to reduce the hysteresis effect of the non-contact fingertip seal, since the sealing medium is gas in the fingertip seal operation, the effect of the fluid dynamic pressure and the fluid static pressure effect generated by the micro-porous texture in the gas medium is weak, and therefore the effect of reducing the hysteresis effect is still very limited.
Disclosure of Invention
Therefore, the invention provides a non-contact fingertip sealing device on one hand, which can reduce or even eliminate the hysteresis effect and improve the sealing performance.
The invention also provides a gas turbine.
The non-contact fingertip sealing device according to the embodiment of the first aspect of the present invention includes a front baffle, a high-pressure fingertip sheet, a low-pressure fingertip sheet and a rear baffle which are connected in sequence from a high-pressure side to a low-pressure side, wherein a high-pressure end of the rear baffle is provided with a groove to form a pressure balance cavity between the low-pressure fingertip sheet and the rear baffle and divide the high-pressure end surface of the rear baffle into an inner high-pressure end surface and an outer high-pressure end surface, and a part of the inner high-pressure end surface is spaced from the low-pressure fingertip sheet.
According to the non-contact fingertip sealing device provided by the embodiment of the invention, a part of the inner high-pressure end surface of the rear baffle is spaced from the low-pressure fingertip sheet, and a hydrostatic pressure effect is formed on the rear baffle under the action of the pressure difference, so that the contact between the low-pressure fingertip sheet and the rear baffle can be avoided, the friction of a contact surface is reduced, the hysteresis effect of fingertip sealing is reduced or even eliminated, and the sealing performance is improved.
In some embodiments, the inner high pressure end surface extends outwardly from an inner peripheral surface of the backplate and is disposed obliquely from a high pressure side toward a low pressure side.
In some embodiments, the inner high pressure end surface comprises a plurality of interconnected segments, each segment extending outwardly and being inclined from the high pressure side towards the low pressure side, at least one of the plurality of segments having an inclination angle greater than the inclination angle of the remaining segments.
In some embodiments, the inner high pressure end surface is divided into a first section and a second section connected to each other, the first section extending outward from the inner peripheral surface of the backplate and being disposed obliquely from the high pressure side toward the low pressure side, the second section extending outward from the outer end of the first section and being disposed obliquely from the high pressure side toward the low pressure side, the second section having an inclination angle greater than that of the first section.
In some embodiments, the inner high pressure end surface includes a first section extending outwardly from an inner peripheral surface of the tailgate and contacting the low pressure fingertip pieces, and a second section extending outwardly from an outer end of the first section and disposed obliquely from the high pressure side toward the low pressure side.
In some embodiments, the inner high pressure end surface is stepped.
In some embodiments, said inner high pressure end surface comprises a plurality of interconnected segments, at least one of said segments being in contact with said low pressure fingertip sheet, the remaining of said segments being spaced from said low pressure fingertip sheet.
In some embodiments, the inner high pressure end face comprises a first section extending outwardly from the inner peripheral surface of the tailgate and contacting the low pressure fingertip pieces, a second section parallel to the first section, and a third section spaced from the low pressure fingertip pieces.
In some embodiments, a first hole is formed in the front baffle, a second hole is formed in the high-pressure fingertip piece, a third hole is formed in the low-pressure fingertip piece, and the third hole, the second hole and the first hole are sequentially communicated and coaxially arranged.
A gas turbine according to an embodiment of the second aspect of the invention comprises a rotor and a contactless fingertip seal cooperating with the rotor, the contactless fingertip seal being as described in any of the embodiments above.
Drawings
Fig. 1 is a schematic structural view of a non-contact fingertip sealing device according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of a non-contact fingertip sealing device in accordance with one embodiment of the present invention.
Fig. 3 is a cross-sectional view of a non-contact fingertip sealing device in accordance with another embodiment of the present invention.
Fig. 4 is a cross-sectional view of a non-contact fingertip sealing device in accordance with yet another embodiment of the present invention.
Fig. 5 is a cross-sectional view of a non-contact fingertip sealing device in accordance with yet another embodiment of the present invention.
Reference numerals:
the non-contact fingertip sealing device 100 comprises a front baffle plate 1, a first hole 11, a high-pressure fingertip piece 2, a second hole 21, a low-pressure fingertip piece 3, a third hole 31, a rear baffle plate 4, a groove 40, an inner high-pressure end surface 41, a first section 411, a second section 412, a third section 413, an outer high-pressure end surface 42 and a rotor 200.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
As shown in fig. 1 to 5, the noncontact fingertip seal device 100 according to the embodiment of the present invention includes a front barrier 1, a high-pressure fingertip piece 2, a low-pressure fingertip piece 3, and a back barrier 4 connected in sequence from a high-pressure side to a low-pressure side (a left end of the back barrier 4 shown in fig. 2 to 4), a high-pressure end of the back barrier 4 (a left end of the back barrier 4 shown in fig. 2 to 4) is provided with a groove 40 to form a pressure balance chamber between the low-pressure fingertip piece 3 and the back barrier 4, the groove 40 may divide a high-pressure end face (a left end face shown in fig. 2 to 4) of the back barrier 4 into an inner high-pressure end face 41 (a lower high-pressure end face shown in fig. 2 to 4) and an outer high-pressure end face 42 (an upper high-pressure end face shown in fig. 2 to 4), and a part of.
In other words, the non-contact fingertip sealing device 100 includes a front baffle 1, a high-pressure fingertip piece 2, a low-pressure fingertip piece 3 and a rear baffle 4 which are connected in sequence from left to right, a groove 40 which is recessed to the right is formed in the left end face of the rear baffle 4, a pressure balance cavity is formed between the low-pressure fingertip piece 3 and the rear baffle 4 through the groove 40, and the left end face of the rear baffle 4 is divided into a left upper end face and a left lower end face through the groove 40, wherein a part of the left lower end face is spaced from the right end face of the low-pressure fingertip piece 3, that is, a part of the left lower end face is spaced from the right end face of the low-pressure fingertip piece 3, and a part of the left lower end face is in contact with the right end face of the. In particular, the outer high pressure end face 42 is in contact with the low pressure fingertip piece 3. In other words, as shown in fig. 2 to 4, the upper left end surface is in contact with the right end surface of the low pressure fingertip sheet 3.
According to the non-contact fingertip sealing device 100 disclosed by the invention, a part of the inner high-pressure end surface 41 of the rear baffle 4 is spaced from the low-pressure fingertip sheet 3, and a hydrostatic pressure effect is formed on the rear baffle under the action of a pressure difference, so that the contact between the low-pressure fingertip sheet 3 and the rear baffle 4 can be avoided, the friction of a contact surface is reduced, the hysteresis effect of fingertip sealing is reduced or even eliminated, and the sealing performance is improved.
It will be appreciated that a gas turbine according to an embodiment of the present invention includes a rotor 200 and a fingertip seal 100 according to an embodiment of the present invention, the fingertip seal 100 according to an embodiment of the present invention cooperating with the rotor 200 as shown in fig. 2-4. The reason for the "hysteresis effect" is that the low pressure finger tip 3 is pushed away from the initial position due to the radial displacement of the rotor 200, and when the radial displacement of the rotor 200 is reduced or eliminated, the friction force between the low pressure finger tip 3 and the backplate 4 prevents the low pressure finger tip 3 from returning to the initial position, so that a large gap is generated between the axial shoe bottom of the low pressure finger tip and the surface of the rotor 200, and the sealing performance is reduced. The non-contact fingertip sealing device provided by the embodiment of the invention can greatly reduce/eliminate the friction force between the low-pressure fingertip pieces 3 and the rear baffle 4, so that the low-pressure fingertip pieces 3 can be smoothly restored to the initial position, thereby avoiding the generation of a large gap between the axial shoe bottom of the low-pressure fingertip and the surface of the rotor 200, and improving the sealing performance of fingertip sealing.
In some alternative embodiments, as shown in fig. 2, the inner high-pressure end surface 41 extends outward (from bottom to top in fig. 2) from the inner peripheral surface of the backplate 4 (the lower end surface of the backplate 4 in fig. 2) and is disposed obliquely from the high-pressure side toward the low-pressure side (from left to right in fig. 2). In other words, the inner high-pressure end surface 41 is inclined upward and from left to right from the lower end surface of the back board 4 by an angle α, that is, only the lower edge of the inner high-pressure end surface 41 is in contact with the low-pressure fingertip sheet 3, and the rest of the inner high-pressure end surface 41 is spaced apart from the low-pressure fingertip sheet 3.
It will be appreciated that the invention is not so limited, for example, in alternative embodiments, as shown in FIG. 3, the inner high pressure end face 41 includes a plurality of segments connected to one another, each segment extending outwardly (from bottom to top as viewed in FIG. 3) and being inclined from the high pressure side toward the low pressure side (from left to right as viewed in FIG. 3), at least one of the plurality of segments being inclined at an angle greater than the angle of inclination of the remaining segments. In other words, the inner high pressure end face 41 may have sections with different inclination angles. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Specifically, as shown in fig. 3, the inner high-pressure end surface 41 is divided into a first section 411 and a second section 412 that are connected to each other, the first section 411 extending outward (downward and upward as viewed in fig. 3) from the inner peripheral surface of the backplate 4 (the lower end surface of the rear stage 4 as viewed in fig. 3) and being disposed obliquely from the high-pressure side toward the low-pressure side (left and right as viewed in fig. 3), and the second section 412 being disposed obliquely outward (downward and upward as viewed in fig. 3) from the outer end of the first section 411 (the upper end of the first section 411 as viewed in fig. 3) and from the high-pressure side toward the low-pressure side (left and right as viewed in fig. 3. In the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
In other words, as shown in fig. 3, the first section 411 extends upward from the lower end of the tailgate 4 and is inclined from left to right, the first section 411 has an inclination angle α, the second section 412 extends upward from the upper end of the first section 411 and is inclined from left to right, the second section 412 has an inclination angle β, and β is greater than α.
In still other alternative embodiments, as shown in fig. 4, the inner high-pressure end surface 41 includes a first section 411 and a second section 412 that are connected to each other, the first section 411 extending outward (from below to above as shown in fig. 4) from the inner peripheral surface of the tailgate 4 (the lower end surface of the rear panel 4 as shown in fig. 4) and contacting the low-pressure fingertip sheet 3, and the second section 412 extending outward (from below to above as shown in fig. 4) from the outer end of the first section 411 (the upper end of the first section 411 as shown in fig. 4) and inclined from the high-pressure side toward the low-pressure side (from left to right as shown in fig. 4).
In other words, as shown in fig. 4, the inner high-pressure end surface 41 includes a first section 411 and a second section 412 connected to each other, the first section 411 extends upward from the inner peripheral surface of the back plate 4 and contacts the low-pressure fingertip sheet 3, preferably, the first section 411 is a vertical plane, the second section 412 extends upward from the upper end of the first section 411 and is disposed obliquely from left to right, and the angle of inclination of the second section 412 is α.
In still other alternative embodiments, as shown in FIG. 5, the inner high pressure end surface is stepped.
In some specific embodiments, the inner high pressure end surface 41 comprises a plurality of interconnected segments, at least one of the plurality of segments being in contact with the low pressure fingertip piece 3, the remaining of the plurality of segments being spaced apart from the low pressure fingertip piece 3.
Specifically, the inner high pressure end face 41 includes a first section 411, a second section 412 and a third section 413, the third section 413 connects the first section 411 and the second section 412, the first section 411 extends outward from the inner peripheral surface of the back plate 4 and is in contact with the low pressure fingertip sheet 3, the second section 412 is substantially parallel to the first section 411, and the second section 412 is spaced apart from the low pressure fingertip sheet 3. Preferably, as shown in fig. 5, the first section 411 is a vertical plane and is in contact with the right end face of the low pressure fingertip sheet 3, the second section 412 is a vertical plane and is spaced apart from the right end face of the low pressure fingertip sheet 3, and the third section 413 is a horizontal plane and connects the first section 411 and the second section 412.
In some embodiments, as shown in fig. 5, a first hole 11 is formed in the front baffle 1, a second hole 21 is formed in the high-pressure fingertip sheet 2, a third hole 31 is formed in the low-pressure fingertip sheet 3, and the first hole 11, the second hole 21, and the third hole 31 are sequentially communicated and coaxially arranged. It is understood that the front barrier 1, the high pressure fingertip pieces 2 and the low pressure fingertip pieces 3 are connected by fixing members (not shown) such as bolts and nuts, etc., which are sequentially passed through the first hole 11, the second hole 21 and the third hole 31 to connect the front barrier 1, the high pressure fingertip pieces 2 and the low pressure fingertip pieces 3.
A non-contact fingertip sealing device 100 in accordance with an embodiment of the present invention will be described with reference to fig. 1 and 2.
As shown in fig. 1-2, a non-contact fingertip sealing device 100 according to the embodiment of the present invention includes a front barrier 1, a high pressure fingertip sheet 2, a low pressure fingertip sheet 3, and a back barrier 4 connected in this order from left to right, a left end surface of the back barrier 4 is provided with a groove 40 recessed to the right, a pressure balance cavity is formed between the low-pressure fingertip sheet 3 and the rear baffle 4 through the groove 40, and the left end surface of the rear baffle 4 is divided into an inner high-pressure end surface 41 (a lower high-pressure end surface shown in fig. 2) and an outer high-pressure end surface 42 (an upper high-pressure end surface shown in fig. 2) through the groove 40, the outer high-pressure end surface 42 is in contact with the right end surface of the low-pressure fingertip sheet 3, the inner high-pressure end surface 41 faces upwards from the lower end surface of the rear baffle 4 and inclines from left to right, the inclination angle, namely, the lower edge of the inner high-pressure end surface 41 is contacted with the right end surface of the low-pressure fingertip piece 3, and the rest part of the inner high-pressure end surface 41 is spaced from the right end surface of the low-pressure fingertip piece 3.
Preceding baffle 1 is last to be equipped with first hole 11, is equipped with second hole 21 on the high pressure fingertip piece 2, is equipped with third hole 31 on the low pressure fingertip piece 3, and first hole 11, second hole 21 and third hole 31 communicate in proper order and coaxial setting. A fixing member (not shown) passes through the first hole 11, the second hole 21 and the third hole 31 in order to connect the front barrier 1, the high pressure fingertip sheet 2 and the low pressure fingertip sheet 3.
A contactless fingertip sealing device 100 according to another embodiment of the present invention is described below with reference to fig. 3. As shown in fig. 3, the noncontact fingertip sealing device 100 according to the embodiment of the present invention includes a front barrier 1, a high pressure fingertip sheet 2, a low pressure fingertip sheet 3 and a back barrier 4 connected in this order from left to right.
The inner high-pressure end surface 41 is divided into a first section 411 and a second section 412 that are connected to each other, the first section 411 extending upward from the inner peripheral surface of the tailgate 4 and inclining from left to right, the first section 411 having an inclination angle α, the second section 412 extending upward from the upper end of the first section 411 and inclining from left to right, the second section 412 having an inclination angle β, and β being larger than α.
The other structure and operation of the non-contact fingertip seal device 100 shown in fig. 3 may be the same as the embodiment shown in fig. 1 and 2 and will not be described in detail here.
A contactless fingertip sealing device 100 according to still another embodiment of the present invention will be described with reference to fig. 4. As shown in fig. 4, the non-contact fingertip sealing device 100 according to the embodiment of the present invention includes a front barrier 1, a high pressure fingertip sheet 2, a low pressure fingertip sheet 3, and a back barrier 4 connected in this order from left to right.
The inner high-pressure end face 41 comprises a first section 411 and a second section 412 which are connected with each other, the first section 411 and the second section 412 are sequentially arranged from bottom to top, the first section 411 is a vertical plane and is in contact with the low-pressure fingertip piece 3, the second section 412 extends upwards from the upper end of the first section 411 and is obliquely arranged from left to right, and the inclination angle of the second section 412 is alpha.
The other structure and operation of the non-contact fingertip seal device 100 shown in fig. 4 may be the same as the embodiment shown in fig. 1 and 2, and will not be described in detail here.
A contactless fingertip sealing device 100 according to still another embodiment of the present invention will be described with reference to fig. 5. As shown in fig. 5, the non-contact fingertip sealing device 100 according to the embodiment of the present invention includes a front barrier 1, a high pressure fingertip sheet 2, a low pressure fingertip sheet 3, and a back barrier 4 connected in this order from left to right.
The inner high-pressure end face 41 comprises a first section 411, a second section 412 and a third section 413, the third section 413 is connected with the first section 411 and the second section 412, the first section 411 and the second section 412 are both vertical planes, the first section 411 is located at the bottom of the second section 412, the third section 413 is a horizontal plane and is connected with the first section 411 and the second section 412, the first section 411 is in contact with the right end face of the low-pressure fingertip piece 3, and the second section 412 is spaced from the right end face of the low-pressure fingertip piece 3.
The other structure and operation of the non-contact fingertip seal device 100 shown in fig. 5 may be the same as the embodiment shown in fig. 1 and 2 and will not be described in detail here.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A non-contact fingertip sealing device is characterized by comprising a front baffle, a high-pressure finger tip piece, a low-pressure finger tip piece and a rear baffle which are sequentially connected from a high-pressure side to a low-pressure side, wherein a groove is formed in the high-pressure end of the rear baffle so as to form a pressure balance cavity between the low-pressure finger tip piece and the rear baffle and divide the high-pressure end face of the rear baffle into an inner high-pressure end face and an outer high-pressure end face, one part of the inner high-pressure end face is spaced from the low-pressure finger tip piece, the other part of the inner high-pressure end face is in contact with the low-pressure finger tip piece, and the part of the inner high-pressure end face is located on the outer side of the other part of the inner.
2. The noncontact fingertip seal device of claim 1 wherein the inner high pressure end face extends outward from the inner peripheral surface of the back plate and is disposed obliquely from a high pressure side toward a low pressure side.
3. The fingertip seal device of claim 1, wherein the inner high pressure end surface includes a plurality of segments connected to each other, each segment extending outward and being inclined from the high pressure side toward the low pressure side, at least one of the plurality of segments having an inclination angle greater than that of the remaining segments.
4. The noncontact fingertip seal device of claim 3 wherein the inner high pressure end face is divided into a first section and a second section connected to each other, the first section extending outwardly from the inner peripheral surface of the backplate and being disposed obliquely from a high pressure side toward a low pressure side, the second section extending outwardly from an outer end of the first section and being disposed obliquely from a high pressure side toward a low pressure side, the angle of inclination of the second section being greater than the angle of inclination of the first section.
5. The non-contact fingertip seal device according to claim 1, wherein the inner high pressure end face includes a first section and a second section connected to each other, the first section extending outward from an inner peripheral surface of the back plate and being in contact with the low pressure fingertip sheet, the second section extending outward from an outer end of the first section and being disposed obliquely from a high pressure side toward a low pressure side.
6. The non-contact fingertip seal of claim 1, wherein the inner high pressure end surface is stepped.
7. The non-contact fingertip seal device of claim 6 wherein the inner high pressure end surface comprises a plurality of interconnected segments, at least one of the plurality of segments being in contact with the low pressure fingertip sheet, the remaining of the plurality of segments being spaced apart from the low pressure fingertip sheet.
8. The non-contact fingertip seal device of claim 7 wherein the inner high pressure end face includes a first section, a second section and a third section, the third section connecting the first section and the second section, the first section extending outwardly from the inner peripheral surface of the backplate and contacting the low pressure fingertip sheet, the second section and the first section being parallel to each other and the second section being spaced apart from the low pressure fingertip sheet.
9. The device as claimed in any one of claims 1 to 8, wherein the front baffle is provided with a first hole, the high pressure fingertip sheet is provided with a second hole, the low pressure fingertip sheet is provided with a third hole, and the third hole, the second hole and the first hole are sequentially communicated and coaxially arranged.
10. A gas turbine engine comprising a rotor and a non-contact fingertip seal device engaged with the rotor, the non-contact fingertip seal device defined in any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811277811.0A CN111120113B (en) | 2018-10-30 | 2018-10-30 | Gas turbine and non-contact fingertip sealing device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811277811.0A CN111120113B (en) | 2018-10-30 | 2018-10-30 | Gas turbine and non-contact fingertip sealing device thereof |
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| CN111120113A CN111120113A (en) | 2020-05-08 |
| CN111120113B true CN111120113B (en) | 2021-03-19 |
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| CN113294524A (en) * | 2021-05-21 | 2021-08-24 | 北京卫蓝新能源科技有限公司 | Non-contact sealing structure |
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| CN101749429A (en) * | 2009-12-25 | 2010-06-23 | 中国燃气涡轮研究院 | Fingertip seal structure and back baffle plate thereof |
| CN102425461A (en) * | 2011-12-27 | 2012-04-25 | 中国燃气涡轮研究院 | Low-hysteresis reeled and fixed brush type sealing device |
| EP2878772A1 (en) * | 2013-10-23 | 2015-06-03 | Honeywell International Inc. | Finger-foil seals and gas turbine engines employing the same |
| CN104806301A (en) * | 2015-04-03 | 2015-07-29 | 清华大学 | Non-contact fingertip-labyrinth-brush type combined sealer |
| CN104864102A (en) * | 2015-04-03 | 2015-08-26 | 清华大学 | Non-contact fingertip seal device with rear baffle adopting micropore texture |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6811154B2 (en) * | 2003-02-08 | 2004-11-02 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Noncontacting finger seal |
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2018
- 2018-10-30 CN CN201811277811.0A patent/CN111120113B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101749429A (en) * | 2009-12-25 | 2010-06-23 | 中国燃气涡轮研究院 | Fingertip seal structure and back baffle plate thereof |
| CN102425461A (en) * | 2011-12-27 | 2012-04-25 | 中国燃气涡轮研究院 | Low-hysteresis reeled and fixed brush type sealing device |
| EP2878772A1 (en) * | 2013-10-23 | 2015-06-03 | Honeywell International Inc. | Finger-foil seals and gas turbine engines employing the same |
| CN104806301A (en) * | 2015-04-03 | 2015-07-29 | 清华大学 | Non-contact fingertip-labyrinth-brush type combined sealer |
| CN104864102A (en) * | 2015-04-03 | 2015-08-26 | 清华大学 | Non-contact fingertip seal device with rear baffle adopting micropore texture |
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| Publication number | Publication date |
|---|---|
| CN111120113A (en) | 2020-05-08 |
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