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 gas turbine engine comprising:
a fan; a compressor section fluidly connected to the fan, the compressor section having first and second pressure compressors; a combustor fluidly connected to the compressor section; a turbine section fluidly connected to the combustor, the turbine section comprising:
a first pressure turbine coupled to the first compressor via a first shaft;a second pressure turbine coupled to the second compressor via a second shaft; anda mid-turbine frame positioned between the second pressure turbine and the first pressure turbine, the mid-turbine frame supporting one of the first and second shafts by a bearing; a geared architecture interconnecting at least one of the first and second turbines and the fan; and a mid-turbine frame buffer system comprising:
an air compartment; anda bearing compartment arranged radially inward of the mid-turbine frame, the bearing compartment arranged within the air compartment, the bearing compartment including a seal assembly provided adjacent the bearing and separating the bearing compartment from the air compartment, the air compartment including two or more air seals; wherein the compressor section is fluidly connected to the air compartment and is configured to provide pressurized air to the seal assembly in the air compartment to buffer the bearing compartment; and wherein the mid-turbine frame includes a member arranged in a core flow path, the member providing a passage fluidly connecting mid-turbine frame outer and inner areas to one another for delivering the pressurized air to the air compartment.