Turbine rotor
AssigneeSociete Nationale d'Etude et Moteurs d'Aviation "S.N.E.C.M.A."
InventorsPhilippe M. D. Gastebois, Jean-Francois R. Imbault
Life of this patent
Estimating the term…
Abstract
A turbine rotor has composite ceramic blades each having a bulb-shaped root with planar flanks which define an angle of convergence between them not exceeding ten degrees, and by which the root is held in a dovetail section socket in the periphery of the rotor disc by means of wedge-shaped members also disposed in the socket on opposite sides of the root. Each wedge-shaped member is part of an element including a platform which is disposed adjacent the curved portion of the blade radially outwards of the socket and which is joined to the wedge-shaped member by an integral strut. The platforms of all of the elements extend in a circumferential direction and combine to define a continuous ring forming part of the inner boundary of the gas flow path through the turbine.
Claims5
A turbine rotor comprising
- a disc,
- a plurality of rectilinear, axially oriented sockets in the periphery of said disc, said sockets being evenly distributed around said periphery and each having side walls and a bottom wall providing said socket with a dovetail shaped cross-section,
- a plurality of blades disposed in respective ones of said sockets and projecting radially outwards from said periphery of said disc, said blades being formed of a composite ceramic fibre material and each of said blades having
- an aerofoil shaped body radially outwards of said disc defining concavely and convexly curved sides of said blade, and
- a root received in one of said sockets, said root being in the form of a bulb and having a bottom face and two flat side faces defining an angle of convergence towards said body not exceeding 10 o whereby said ceramic fibres of said blade proceed continuously from said body to said root of said blade without geometric distortion, and
- locking means associated with each of said blades for locking said blade in said corresponding socket, said locking means including a pair of elements disposed on opposite sides of said blade, each of said elements comprising
- a wedge-shaped member disposed in said socket between one of said side faces of said root and the adjacent one of said side walls of said socket to ensure radial locking of said blade,
- a platform disposed adjacent said blade radially outwards of said disc and extending in a circumferential direction, and
- a strut connecting said platform to said wedge-shaped member,
- said platforms of said elements of said locking means of all of said blades co-operating to form a continuous ring intersected by said blades and defining part of the inner boundary of the main streamline flow path of the turbine gases.
Dependencies are inferred from the claim text.