Patent ID: 9382844
Filing Date: 2016-07-05
CPC Classification: F01D,F02C,F02K,F05D,F16J

Claim Text:
1. A method of providing pressurized air to a buffer system for a gas turbine engine with an outer shaft arranged about an inner shaft, a high pressure compressor mounted to the outer shaft, and a low pressure compressor mounted to the inner shaft, the method comprising steps of: sealing a bearing compartment comprising a plurality of bearings supporting the outer shaft, with two or more seals; coupling one seal of the two or more seals to the outer shaft and another seal of the two or more seals to the inner shaft; surrounding the bearing compartment with an air compartment, wherein the bearing compartment is provided between low and high pressure turbines respectively mounted to the inner and outer shafts; and supplying pressurized air from the high pressure compressor to the air compartment.