Power plants – Combustion products used as motive fluid – Combustion products generator
Patent
1996-12-23
1999-01-26
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
Combustion products generator
415106, F02C 308
Patent
active
058626662
ABSTRACT:
A modified turbine engine design in which control of the forward load on a thrust bearing is improved, while reducing or eliminating the need for the use of a balance piston is disclosed. The turbine engine has a longitudinal axis and comprises, a compressor for pressurizing gases in the engine. The impeller has an impeller rear face and a tip. The engine further comprises a shaft mounted to a thrust bearing for rotation about the axis. The impeller is fixed to the shaft for rotation therewith. A cavity fixed within the engine casing is defined at least by the impeller rear face and is in communication with the pressurized gases at the impeller tip. The engine further comprises a bleed in communication with both the cavity and the pressurized gases, so that the cavity is pressurized by the pressurized gases from the impeller tip and the bleed, thereby loading the impeller rear face to load the thrust bearing through the shaft. Preferably, the pressurized gases from the bleed reduce flow swirl in the cavity and thereby increase the pressure in the cavity.
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Astle Jeffrey W.
Casaregola Louis J.
Pratt & Whitney Canada Inc.
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