Patent ID: 8182209

Claim:
A compressor comprising a casing housing a plurality of compression stages, each comprising a bladed rotor wheel driven in rotation, the first stage being preceded by an inlet stator presenting stationary vanes of adjustable pitch, having pivots that pass through said casing, and an air reinjection circuit, wherein said air reinjection circuit includes injection holes passing through at least some of the vanes of said inlet stator, and opening out internally in the vicinity of their pivots, into the inlet stream of the compressor substantially tangentially relative to the casing, wherein each of said stationary vane includes a base of circular outline with the pivot projecting outwards from a center thereof, wherein said base is housed in a housing in an outer shroud of the casing, wherein said injection holes extend in an inclined manner through the base, wherein holes in the outer shroud of said casing open out in an annular cavity defined around said pivot and limited by the radially external surface of the inlet stator, said outer shroud of the casing, a flat annular gasket and a bushing forming the bearing of the pivot, and wherein said injection holes extend between said annular cavity and the inside of the casing.