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US 9,957,830 B2Granted
Hybrid passive and active tip clearance system
AssigneeUnited Technologies Corporation
InventorsMichael G. McCaffrey, Mark Borja, Brandon T. Rouse, John R. Farris, Brian R. Pelletier, Thomas Almy, Igor S. Garcia
Life of this patent
Estimating the term…
Abstract
A control ring extends circumferentially about a central axis. A plurality of circumferentially spaced carrier portions have a cavity receiving the control ring. There are circumferential gaps between the carrier portions. A blade outer air seal is mounted on the carrier portions radially inwardly of the control ring. The control ring maintains the carrier portions at a radially outwardly expanded position when heated by an electric heater.
Claims17
A blade outer air seal assembly comprising:
- a control ring extending circumferentially about a central axis;
- a plurality of circumferentially spaced carrier portions having a cavity receiving said control ring, the carrier portions positioned with circumferential gaps between said carrier portions;
- a blade outer air seal mounted on said carrier portions radially inwardly of said control ring;
- wherein said control ring maintains said carrier portions at a radially outwardly expanded position when said control ring is heated by an electric heater;
- and
- wherein when said carrier portions are at said radially outwardly expanded position, said carrier portions are spaced radially away from a radially outer surface of said control ring, and said carrier portions being movable to a radially inward position, wherein said carrier portions are in contact with said radially outer surface of said control ring.
3 more elements
A gas turbine engine comprising:
- a turbine section having a plurality of rotating turbine blades, and a blade outer air seal mounted radially outwardly of said turbine section and there being a tip clearance between a radially outer portion of said blades and a radially inner face of said blade outer air seal;
- a control ring extending circumferentially about a central axis;
- a plurality of circumferentially spaced carrier portions having a cavity receiving said control ring, the carrier portions positioned with circumferential gaps between said carrier portions, said blade outer air seal mounted on said carrier portions radially inwardly of said control ring, wherein said control ring maintains said carrier portions at a radially outwardly expanded position when said control ring is heated by an electric heater;
- and
- wherein when said carrier portions are at said radially outwardly expanded position, said carrier portions are spaced radially away from a radially outer surface of said control ring, and said carrier portions being movable to a radially inward position, wherein said carrier portions are in contact with said radially outer surface of said control ring.
2 more elements
Dependencies are inferred from the claim text.