United Technologies Corporation

J Axel Glahn

Larry W Spires

Robert E Peters

Dwayne E Messerschmidt

Roger M Barnsby

Kenneth L Allard

Hsianmin Jen

Hslanmin F Jen

William G Sheridan

Denman H James

Michael K Sahm

Yuan Dong

Sean P McCutchan

James T Thoresen

An oil scavenge system includes a tangential scavenge scoop and a settling area adjacent thereto which separately communicate with a duct which feeds oil into an oil flow path and back to an oil sump. A shield is mounted over the settling area to at least partially shield the collecting liquid oil from interfacial shear. A multiple of apertures are located through the shield to permit oil flow through the shield and into the duct. The scavenge scoop forms a partition which separates the duct into a first portion and a second portion. The first portion processes upstream air/oil mixture that is captured by the tangential scoop while the second portion receives the oil collected in the settling area.

Bifurcated oil scavenging bearing compartment within a gas turbine engine

An emergency lubrication system for a turbine engine includes a reservoircontaining a reserve quantity of lubricantand having a lubricant inletand a lubricant outlet. A lubricant supply lineand a lubricant outlet lineeach have a respective valvesfor regulating lubricant flow into and out of the reservoir. A fluid supply lineincludes a valvefor selectively establishing communication between the reserve quantity of lubricant and a source of pressurized fluid. During normal operation the lubricant outlet valve continuously releases lubricant at a normal rate to the component requiring lubrication while the lubricant inlet valve concurrently admits fresh lubricant into the reservoir. During abnormal operation, the lubricant inlet valve closes in response to abnormally low lubricant pressure outside the reservoir thereby preventing backflow of reserve lubricant out of the reservoir. The fluid inlet valve opens to admit pressurized fluid into the reservoir thus pressurizing the reserve lubricant. The lubricant outlet valve opens or cycles open and closed in response to a command from a controllerso that the pressurized fluid forces lubricant through the outletas a subnormal rate, which persists until the lubricant reserve is substantially depleted. The subnormal rate is ideally achieved by intermittently releasing lubricant from the reservoir, but may also be achieved by releasing a continuous stream of lubricant at a rate less than the normal rate of release.

Emergency lubrication system

A deoilerfor 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 deoilercreates 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 system, the source of contaminated air may be a buffered bearing compartment. The inventive deoiler ensures a positive pressure difference across the bearing compartment sealsat 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.

Deoiler for a lubrication system

Method of scavenging oil within a gas turbine engine

Bifurcated oil scavenge system for a gas turbine engine

The present invention relates to an engine integrated auxiliary power unit. The engine comprises a high pressure spool which includes a high pressure compressor connected to a high pressure turbine and a low pressure spool which includes a low pressure compressor connected to a low pressure turbine. The engine further has a system for independently operating the high pressure spool and thus allowing the high pressure spool to function as an auxiliary power unit.

Engine integrated auxiliary power unit

Growing community of inventors

Manchester, CT, United States of America

J Axel Glahn