Patent ID: 11879396
Assignee: RTX CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 14:
15. A method for using a turbomachine, the turbomachine comprising:
a bearing in a bearing compartment; and
a first seal system isolating the bearing compartment and comprising:
a first runner;
a second runner;
an inner seal encircling the first runner; and
an outer seal encircling the second runner,, wherein:
the inner seal has a static clearance with the first runner; and
the outer seal has a static clearance with the second runner, greater than the inner seal static clearance,, the method comprising:
driving rotation of a shaft carrying the first runner and the second runner; and
preferentially cooling the first runner relative to the second runner.