US 11,867,068 B2
Fast response active clearance systems with piezoelectric actuator in axial, axial/radial combined, and circumferential directions
Taehong Kim, Evendale, OH (US); and Tyler F. Hooper, Lynn, MA (US)
Assigned to General Electric Company, Schenectady, NY (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on May 9, 2022, as Appl. No. 17/739,766.
Prior Publication US 2023/0358147 A1, Nov. 9, 2023
Int. Cl. F01D 11/20 (2006.01); F03G 7/06 (2006.01); H10N 30/50 (2023.01); H10N 30/20 (2023.01); H10N 30/80 (2023.01)
CPC F01D 11/20 (2013.01) [F03G 7/0665 (2021.08); F03G 7/06145 (2021.08); H10N 30/206 (2023.02); H10N 30/50 (2023.02); H10N 30/802 (2023.02)] 18 Claims
OG exemplary drawing
 
1. An apparatus to control clearance for a turbine or a compressor of an engine, the apparatus comprising:
an actuator to control clearance between a blade and at least one of a shroud or a hanger, the actuator including a multilayer stack of material, and wherein the actuator is outside a case; and
a rod coupled to the actuator and the at least one of the shroud or the hanger through an opening in the case, the rod to move the at least one of the shroud or the hanger in a radial direction based on axial movement of the multilayer stack of material,
the case including a first seal on an outer surface of the case and a second seal on an inner surface of the case at the opening in the case for the rod, the first seal and the second seal to reduce leakage through the opening in the case.