Mid-turbine frame buffer system

摘要

A mid-turbine frame buffer system for a gas turbine engine includes a mid-turbine frame that supports a shaft by a bearing. An air compartment and a bearing compartment are arranged radially inward of the mid-turbine frame. The bearing compartment is arranged within the air compartment and includes first and second contact seals arranged on either side of the bearing. The air compartment includes multiple air seals. A high pressure compressor is fluidly connected to the air compartment and is configured to provide high pressure air to the air compartment. A method of providing pressurized air to a buffer system includes sealing a bearing compartment with contact seals, surrounding the bearing compartment with an air compartment, and supplying high pressure air to the air compartment.

主权项

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.