US4447190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure control in a gas turbine engine
Assignee: Rolls Royce PLC
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Filing: 1982-11-02
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Granted: 1984-05-08
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Expires: 2002-11-02
Abstract
Abstract Air is bled from the compressor of a gas turbine engine and it is led to holes in the shanks of turbine blades, so as to cool the interiors of the blades during operation of the engine. Some of the air leaks radially outwards, to seal the gas annulus against hot gas leaks onto the face of the turbine disc. A reduced flow of cooling air is enabled at conditions other than engine full throttle. This however, starves the gas sealing air. The invention provides a back up supply, by putting the air through a plenum chamber and dividing it so that when cooling airflow is reduced, a further sealing air flow is provided in compensation therefore.
Inventors
- 👤 David A. Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:50
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/28; F01; F01D; F01D25/00; F01D25/08; F01D25/12; F01D5/00; F01D5/02; F01D5/08; F01D5/12; F01D5/14; F01D5/18; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
127 words
A gas turbine engine including a casing, a turbine stage comprising a disc having an upstream face and a rim and blades having shanks, a pair of annular lands adapted for co-rotation with said turbine stage, a pair of annular grooves in said casing for receipt of said annular lands, a first annular space to which cooling air is passed from between said lands, a further annular space radially outwardly of said first annular space, a plenum chamber for receipt of pressurized air, a pair of ducts communicating with said plenum chamber and with respective annular spaces and valve means in each duct and adapted for simultaneous operation to reduce flow of pressurized air in one duct and increase flow of pressurized air in the other duct.
Claim 2
Dependent Claim
127 words
A gas turbine engine including a casing, a turbine stage comprising a disc having an upstream face and a rim and blades having shanks, a pair of annular lands adapted for co-rotation with said turbine stage, a pair of annular grooves in said casing for receipt of said annular lands, a first annular space to which cooling air is passed from between said lands, a further annular space radially outwardly of said first annular space, a plenum chamber for receipt of pressurized air, a pair of ducts communicating with said plenum chamber and with respective annular spaces and valve means in each duct and adapted for simultaneous operation to reduce flow of pressurized air in one duct and increase flow of pressurized air in the other duct.
Claim 3
Dependent Claim
25 words
A gas turbine engine as claimed in claim 1 wherein said lands are adapted for rotation by forming them integrally with upstream face of disc.
Claim 4
Dependent Claim
61 words
A gas turbine engine as claimed in claim 1 wherein said lands are adapted for rotation by forming them on an annular plate which is affixed to said upstream face of said disc so as to overlap said rim of said disc and said shanks of said blades and form with said upstream face of said disc said first annular space.
Claim 5
Dependent Claim
17 words
A gas turbine engine as claimed in claim 1 wherein said valve means comprises a spool valve.
Claim 6
Dependent Claim
17 words
A gas turbine engine as claimed in claim 1 wherein said valve means comprises linked butterfly valves.
Claim 7
Dependent Claim
49 words
A gas turbine engine as claimed in claim 1 wherein said valve means comprises blocking means in each duct, a stepper motor connected to each blocking means such that actuating thereof will move said blocking means in directions which will simultaneously block one duct and unblock said other duct.
Claim 8
Dependent Claim
20 words
A gas turbine engine as claimed in claim 1 or claim 6 wherein said plenum chamber is in said casing.
References Cited (Backward Citations)
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US2988325A
Cited
GB1168771A
Cited
GB1381277A
Cited
US3975901A
Cited
US4218189A
Cited
US4265590A
Cited
US4348157A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |