US 12,092,020 B2
Architecture of a turbomachine with counter-rotating turbine
Francois Gallet, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 17/594,626
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Apr. 2, 2020, PCT No. PCT/EP2020/059453
§ 371(c)(1), (2) Date Oct. 25, 2021,
PCT Pub. No. WO2020/221548, PCT Pub. Date Nov. 5, 2020.
Claims priority of application No. 1904590 (FR), filed on Apr. 30, 2019.
Prior Publication US 2022/0195917 A1, Jun. 23, 2022
Int. Cl. F02C 3/067 (2006.01); F02C 7/06 (2006.01); F04D 19/02 (2006.01)
CPC F02C 3/067 (2013.01) [F02C 7/06 (2013.01); F04D 19/024 (2013.01); F05D 2240/54 (2013.01); F05D 2240/60 (2013.01); F05D 2260/98 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A counter-rotating turbine of a turbomachine, extending about an axis of rotation, the counter-rotating turbine of the turbomachine including:
an inner rotor configured to rotate about the axis of rotation, and comprising at least one inner movable blade rotatably supported by a first shaft,
an outer rotor configured to rotate about the axis of rotation in a direction opposite to the inner rotor, and comprising at least one outer movable blade rotatably supported by a second shaft coaxial with the first shaft, the first and second shafts extending axially from upstream to downstream of the turbine,
a turbine vane frame disposed upstream from the inner rotor and the outer rotor,
wherein the first shaft is guided in rotation by a first bearing disposed between the first shaft and the turbine vane frame, and the second shaft is guided in rotation by a second bearing disposed between the second shaft and said turbine vane frame, the counter-rotating turbine comprising an outer casing only extending downstream from the turbine vane frame and at least partially surrounding a blade of the at least one inner movable blade and a blade of the at least one outer movable blade, the outer casing extending axially from an upstream end of the turbine, over a length of less than 50% of the length of the turbine, and the outer casing is radially outward of any other portion of the turbine, and wherein the counter-rotating turbine does not include a turbine rear frame casing.