Patent US3600781A successfully refreshed from Google Patents.
US3600781A
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US
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Method of producing a stator vane for a gas turbine engine
Assignee: Rolls Royce PLC
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Filing: 1969-03-06
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Granted: 1971-08-24
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Expires: 1989-03-06
Abstract
Abstract A method of making stator vanes for a gas turbine engine comprises forming the radially outer surface of the vane platform, and/or the radially inner surface of the shroud of the vane, with a convex curvature, and thereafter reducing this convex curvature to a desired value such that the throat area defined between adjacent like stator vanes has the design value. Excessive curvature reduction may be compensated by bending the trailing edges and/or changing the angle of incidence of the vanes.
Inventors
- 👤 Malcolm Ralph Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:25
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/147; F01D5/141; F01D5/142; F01D5/143; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49323
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
159 words
A method of producing a stator assembly having a plurality of angularly spaced-apart stator vanes with a throat area between adjacent vanes of a desired value and with each stator vane having a platform member and a shroud member with a blade portion therebetween, said method comprising the steps of: forming an inner surface of at least one of said shroud and platform members of each of said stator vanes with a selected convex curvature to give a predetermined distance between the inner surfaces for providing a minimum throat area between adjacent vanes when said vanes are assembled, then assembling said stator vanes into the stator assembly and determining which throat areas between adjacent stator vanes are less than the desired value, and thereafter reducing the convex curvature on the said at least one inner surface of the adjacent vanes having throat areas less than the desired value so as to increase these throat areas to the desired value.
Claim 2
Independent Claim
159 words
A method of producing a stator assembly having a plurality of angularly spaced-apart stator vanes with a throat area between adjacent vanes of a desired value and with each stator vane having a platform member and a shroud member with a blade portion therebetween, said method comprising the steps of: forming an inner surface of at least one of said shroud and platform members of each of said stator vanes with a selected convex curvature to give a predetermined distance between the inner surfaces for providing a minimum throat area between adjacent vanes when said vanes are assembled, then assembling said stator vanes into the stator assembly and determining which throat areas between adjacent stator vanes are less than the desired value, and thereafter reducing the convex curvature on the said at least one inner surface of the adjacent vanes having throat areas less than the desired value so as to increase these throat areas to the desired value.
Claim 3
Dependent Claim
28 words
A method as claimed in claim 1 wherein the reducing of the convex curvature on the said at least one inner surface is accomplished by machining such surface.
Claim 4
Dependent Claim
57 words
A method as claimed in claim 1 in which, in order to compensate for excessive reduction of any of the convex curvatures of any of said members of said stator vanes, the trailing edge of such stator vane is bent thereby reducing the distance between such trailing edge and the blade portion of the adjacent stator vane.
Claim 5
Dependent Claim
72 words
A method as claimed in claim 1 in which, in order to compensate foR excessive reduction of any of the convex curvatures of any of said members of said stator vanes, the substantially axially extending edges of the platform member and shroud member are machined so as to change the angle of incidence of the blade portion of the stator vane relative to the direction of gas flow through the stator assembly.
References Cited (Backward Citations)
US2392281A
Cited
US3012308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |