Power plants – Combustion products used as motive fluid – Process
Reexamination Certificate
2008-05-27
2008-05-27
Kershteyn, Igor (Department: 3745)
Power plants
Combustion products used as motive fluid
Process
C060S039080
Reexamination Certificate
active
10815125
ABSTRACT:
A deoiler26for separating oil from air contaminated with the oil has at least one separator for separating the oil from the air and also has a source of suction for reducing air pressure at the source of the air. In an exemplary embodiment, the deoiler26creates the suction at a first operating condition, but acts as a restrictor at a second operating condition. A deoiling method according to the invention creates suction at a first operating condition to reduce the air pressure at the source of the oil-contaminated air, establishes a flow restriction at a second operating condition to pressurize the air source, and encourages oil to separate from the air at both operating conditions. When used as a component of a turbine engine lubrication system22, the source of contaminated air may be a buffered bearing compartment16. The inventive deoiler ensures a positive pressure difference across the bearing compartment seals20at the engine's idle power setting without requiring the idle setting to be undesirably high, and without requiring the use of buffer air whose pressure at higher engine power is high enough to be detrimental. In an exemplary embodiment, the deoiler pressurizes the bearing compartment at higher power settings to resist excessive buffer air infiltration into the bearing compartment.
REFERENCES:
patent: 2774444 (1956-12-01), Soddy
patent: 4683714 (1987-08-01), Thebert
patent: 4877431 (1989-10-01), Avondoglio
patent: 5114446 (1992-05-01), Giersdorf et al.
Dong Yuan
Glahn J. Axel
McCutchan Sean P.
Sheridan William G.
Spires Larry W.
Kershteyn Igor
United Technologies Corporation
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