Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between runner portion and static part – Between blade edge and static part
Patent
1990-02-12
1991-10-15
Look, Edward K.
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between runner portion and static part
Between blade edge and static part
415126, 4151741, F01D 1108
Patent
active
050569880
ABSTRACT:
A clearance control apparatus has a pair of positioning mechanisms for quickly controlling the clearance between rotor blade tips and a shroud segment of a gas turbine engine casing. The positioning mechanisms are supported by axially-spaced casing bosses, coupled to the shroud segment via a shroud holder, and actuatable for moving radially between inner and outer stops. As the positioning mechanisms are moved between the inner and outer stops, the shroud segment is moved therewith toward and away from the rotor axis to respective inner and outer positions relative to the rotor at which corresponding desired minimum and maximum clearances are established between the shroud segment and rotor blade tips. A fluid cylinder on the casing has a piston coupled to the positioning mechanisms by a link. The cylinder is operable for actuating the positioning mechanisms to move solely to one or the other of the inner and outer stops and cause the shroud segment to move solely to one or the other of the inner and outer positions thereof to corresponding solely provide one or the other of the minimum and maximum clearances between the shroud segment and rotor blade tips.
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Technical Report AFAPL-TR-79-2087 entitled, "Thermal Response Turbine Shroud Study", by E. J. Kawecki of Pratt & Whitney; Jul. 1979.
Corsmeier Robert J.
Tseng Wu-Yang
General Electric Company
Look Edward K.
Squillaro Jerome C.
Verdier Christopher M.
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