US 12,291,980 B2
Unducted rectifier for a turbomachine, turbomachine module and aircraft turbomachine
Clémentine Charlotte Marie Mouton, Moissy-Cramayel (FR); Olivier Belmonte, Moissy-Cramayel (FR); Olivier Bazot, Moissy-Cramayel (FR); and Clément Cottet, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 18/569,353
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Jun. 13, 2022, PCT No. PCT/FR2022/051113
§ 371(c)(1), (2) Date Dec. 12, 2023,
PCT Pub. No. WO2022/263752, PCT Pub. Date Dec. 22, 2022.
Claims priority of application No. FR2106330 (FR), filed on Jun. 15, 2021.
Prior Publication US 2024/0271541 A1, Aug. 15, 2024
Int. Cl. F01D 9/04 (2006.01); B64D 27/10 (2006.01); F01D 17/16 (2006.01); F03B 3/12 (2006.01); F04D 29/30 (2006.01); F04D 29/56 (2006.01)
CPC F01D 9/041 (2013.01) [F01D 17/162 (2013.01); F03B 3/126 (2013.01); F04D 29/30 (2013.01); F04D 29/305 (2013.01); F04D 29/563 (2013.01); B64D 27/10 (2013.01); F05D 2220/323 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An unducted flow straightener for a turbomachine having a longitudinal axis, the flow straightener comprising:
a plurality of stator vanes extending along a radial axis, each stator vane comprising a root and a blade rising radially from the root, the root having two half-platforms extending on either side of the blade;
a plurality of pivots, each associated with a stator vane and pivotally mounted along a pitch axis and configured to connect to a pitch change system for changing the pitch of the blades, each pivot having an upper platform and a cylindrical lower portion; and
a plurality of attachment systems, each associated with a stator vane and being adapted to attach the half-platforms of the root of the vane to the associated pivot, each attachment system comprising a clamping system and two plates arranged on either side of the blade, each of the plates having a shape identical to each half-platform, the clamping system being designed to clamp the half-platforms of the root of the vane between the plates of the attachment system and the upper platform of the pivot,
wherein each half-platform of a root of a vane has at least two through-orifices, each upper platform of a pivot associated with the root of the vane has through-holes each arranged opposite a through-orifice of a half-platform, and each plate of an attachment system associated with a root of the vane has through holes each arranged opposite a through orifice of a half-platform,
wherein the clamping system comprises screws and rotation-stop means arranged to clamp the half-platforms of the root of the vane between the plates of the attachment system and the upper platform of the pivot, each screw being inserted successively into a through hole in a plate of the attachment system, an orifice in a half-platform, a through hole in the pivot, and the rotation-stop means,
wherein each lower portion of a pivot comprises a body and a segment of larger diameter than the body arranged between the body and the upper platform, and
wherein each rotation-stop means of a clamping system comprises a flattened area coming in abutment against the segment of larger diameter.