公开(公告)号：US10794275B2

公开(公告)日：2020-10-06

申请号：US15794175

申请日：2017-10-26

Applicant: RAYTHEON TECHNOLOGIES CORPORATION

Inventor： Jorn A. Glahn ,  William K. Ackermann ,  Clifton J. Crawley ,  Philip S. Stripinis

IPC: F02C6/08 ,  F01D25/18 ,  F02C7/14 ,  F02C7/12

Abstract: A gas turbine engine according to an exemplary aspect of the present disclosure includes, among other things, a shaft and first and second bearing structures that support the shaft. Each of the first bearing structure and the second bearing structure includes a bearing compartment that contains a lubricant and a seal that contains the lubricant within the bearing compartments. A buffer system is configured to pressurize the seals to prevent the lubricant from escaping the bearing compartments. The buffer system includes a first circuit configured to supply a first buffer supply air to the first bearing structure, a second circuit configured to supply a second buffer supply air to the second bearing structure, and a controller configured to select between at least two bleed air supplies to communicate the first buffer supply air and the second buffer supply air.