US3742705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal response shroud for rotating body
Assignee: RTX Corp
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Filing: 1970-12-28
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Granted: 1973-07-03
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Expires: 1990-12-28
Abstract
Abstract This invention shows a shroud construction located around the tips of the blades on a rotating body in an engine to provide a minimum clearance between the blade tips and the shroud during all conditions of operation-acceleration, steady state and deceleration. This shroud construction is connected to the end of two annular flanges which extend inwardly from an inner engine case towards the rotating member. The shroud member faces the blade tips and is arranged to have a flow of cooling fluid pass therethrough. Cooling vanes extend from the inner engine case into a duct through which fan air passes. Compressor air passes through the shroud construction.
Inventors
- 👤 P Sifford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:07
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; F01D11/14; F01D11/16; F01D11/18; F01D25/00; F01D25/08; F01D25/12; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
196 words
In an engine, a compressor, combustion means producing hot gases, a turbine motor having blades extending about the periphery thereof, said blades being arranged so that hot gases from said combustion means flow thereover during operation, shroud means extending around the outer tips of said blades for providing a seal therewith, said shroud means receiving heat from the hot gases of said combustion means, an inner engine casing encompassing said shroud means, said inner casing having inwardly extending flange means, said shorud means being connected to said flange means for radial movement therewith during thermal changes, an outer casing being spaced from and extending around said inner casing, cooling fin means extending outwardly from said inner casing for controlling the temperature of the inwardly extending flange means, means for discharging a flow of cooling air over said cooling fin means to maintain a close blade tip clearance with said shroud meanss during steady state operation of said engine, said cooling fin means having a mass which is less than the flange means to reduce the overall cooling rate of the flange means when said engine decelerates and the means for discharing cooling air reduces its flow.
Claim 2
Dependent Claim
196 words
In an engine, a compressor, combustion means producing hot gases, a turbine motor having blades extending about the periphery thereof, said blades being arranged so that hot gases from said combustion means flow thereover during operation, shroud means extending around the outer tips of said blades for providing a seal therewith, said shroud means receiving heat from the hot gases of said combustion means, an inner engine casing encompassing said shroud means, said inner casing having inwardly extending flange means, said shorud means being connected to said flange means for radial movement therewith during thermal changes, an outer casing being spaced from and extending around said inner casing, cooling fin means extending outwardly from said inner casing for controlling the temperature of the inwardly extending flange means, means for discharging a flow of cooling air over said cooling fin means to maintain a close blade tip clearance with said shroud meanss during steady state operation of said engine, said cooling fin means having a mass which is less than the flange means to reduce the overall cooling rate of the flange means when said engine decelerates and the means for discharing cooling air reduces its flow.
Claim 3
Dependent Claim
20 words
An apparatus as set forth in claim 1 wherein passage means directs compressor air on said inwardly extending flange means.
Claim 4
Dependent Claim
50 words
An appparatus as set forth in claim 1 wherein said engine is a fan engine having a fan, said fan discharging fan air into the space between the inner casing and outer casing, said fan being the means for passing a flow of cooling air over said cooling fin means.
Claim 5
Dependent Claim
50 words
An appratus as set forth in claim 2 wherein said engine is a fan engine having a fan, said fan discharging fan air into the space between the inner casing and outer casing, said fan being the means for passing a flow of cooling air over said cooling fin means.
Claim 6
Dependent Claim
84 words
An apparatus as set forth in claim 1 wherein said shroud means comprises a cylindrical-like member having an inner seal face for cooperation with said outer tips of said blades, the outer surface of said cylindrical-like member has a plurality of flow paths therein, a cylindrical-like liner is fixedly positioned adjacent said flow paths forming enclosed passageways, passage means connects air from said compressor to said passageways, opening means connects the rearward ends of said passageways to a point rearwardly of said turbine blades.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |