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Air riding seal with purge cavity

United States Patent

9,732,621
August 15, 2017
View the Complete Patent at the US Patent & Trademark Office
An air riding seal for a turbine in a gas turbine engine, where an annular piston is axial moveable within an annular piston chamber formed in a stator of the turbine and forms a seal with a surface on the rotor using pressurized air that forms a cushion in a pocket of the annular piston. A purge cavity is formed on the annular piston and is connected to a purge hole that extends through the annular piston to a lower pressure region around the annular piston or through the rotor to an opposite side. The annular piston is sealed also with inner and outer seals that can be a labyrinth seal to form an additional seal than the cushion of air in the pocket to prevent the face of the air riding seal from overheating.
Sexton; Thomas D (Tequesta, FL), Mills; Jacob A (Jupiter, FL)
Florida Turbine Technologies, Inc. (Jupiter, FL)
14/ 548,492
November 20, 2014
GOVERNMENT LICENSE RIGHTS This invention was made with Government support under contract number DE-SC0008218 awarded by the Department of Energy. The Government has certain rights in the invention.