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US 7,448,849 B1Granted
Seal
AssigneeROLLS-ROYCE plc
InventorsJohn R Webster, Anthony G Razzell, Philip D Brown
Life of this patent
Estimating the term…
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AssigneeROLLS-ROYCE plc
InventorsJohn R Webster, Anthony G Razzell, Philip D Brown
Estimating the term…
A turbofan gas turbine engine (10) comprises a compressor rotor (24) carrying a plurality of circumferentially spaced radially extending rotor blades (26) and a casing (28) surrounding the compressor rotor (24) and compressor rotor blades (26). A compressor rotor blade tip seal (48) comprises an annular member (30) secured to and arranged within the casing (28). The annular member (40) has a plurality of circumferentially spaced axially extending corrugations (32) and a plurality of radially spaced circumferentially extending corrugations (34). A lining (40) is secured to and arranged within the annular member (30). The lining (40) is spaced radially from the tips (27) of the compressor rotor blades (26) to form a clearance (29). An actuator (56) is provided to move the annular member (30) and lining (40) radially to control the size of the clearance (29).
A seal between a first member and a second member, the first and second members being relatively moveable, the second member being spaced from the first member, a third member being positioned between the second member and the first member, the third member being secured to the second member or the first member, the third member having at least one corrugation in a direction between the first member and the second member and at least one corrugation in a direction transverse to the direction between the first member and the second member, a lining being secured to the third member, the lining being spaced from the first member or the second member to form a seal.
A seal between a first member and a second member, the first and second members being relatively moveable, the second member being spaced from the first member, a third member being positioned between the second member and the first member, the third member being secured to one of the second member and the first member, the third member having at least one corrugation extending in a direction between the first member and the second member and at least one corrugation extending in a direction transverse to the direction between the first member and the second member, a lining being secured to the third member, the lining being spaced from the first member or the second member to form a seal wherein there are means to measure a clearance between the lining and one of the first member and the second member to produce a clearance signal indicative of the size of the clearance, processor means being provided to determine if the clearance signal is within a predetermined range of clearances and adjusting means being provided to adjust the clearance between the lining and one of the first member and second member if the processor means determines that the clearance signal is outside the predetermined range of clearances wherein the adjusting means to adjust the clearance between the blade tips and the lining comprises at least one piezoelectric actuator and at least one L-shaped member, the at least one L-shaped member acting on a radially inner portion of the annular member to move the portion of the annular member towards or away from the blade tips.
Dependencies are inferred from the claim text.