Compressor with variable incidence stator vanes

Claim 1

A turbo machine comprising: a casing having annulus means, a rotor in said casing and having rotor blades in at least one annular array, a stator in said casing and having vanes of variable incidence in at least one annular array, the vanes being in operative relationship with at least one said array of rotor blades, each said vane having means defining a shoulder at its radially inner end, bearing means carried by the annulus means and receiving the stator vanes for variation of the angle of incidence thereof, each stator vane including pivot means engaged in the bearing means, the annulus means also including a plurality of sectors, sealing means intended to limit leakage losses between the stator and the rotor and being mounted to each sector, and adjustment means for the stator vanes distributed between the sectors, wherein the bearing means comprise means defining a bush at the location of each adjustment means, each said bush including an external screw thread, and internally screw-threaded seating means receiving the bush in screw-threaded relationship, wherein relative angular motion of each bush relative to the corresponding seating serves in cooperation with the shoulder to adjust the radial location of the corresponding sector, and means for locking the bush in the adjusted radial location on completion of said adjustment.