Patent ID: 8206090
Filing Date: 2012-06-26
Classification: F01D,F04D,F05D,Y02T

Abstract:
1. A stator stage of a compressor of a turbomachine, comprising an annular row of variable-pitch vanes, each vane having outer and inner radial opposite ends, the outer radial end of each vane comprising an external cylindrical pivot which defines an axis of rotation of the vane and is fitted into a substantially radial duct of an external casing, and the inner radial end of each vane comprising an internal cylindrical pivot mounted in a corresponding housing of an internal ring, wherein the internal cylindrical pivot of each vane extends along an axis substantially parallel to the axis of rotation of the vane and at a distance from the axis of rotation of the vane, and is mounted in the housing of the ring by a swiveling system, wherein the internal ring carries at least one block of an abradable material and is configured to be axially moveable in the downstream and/or the upstream direction by rotating each vane about its axis of rotation, wherein said swiveling system comprises a ball sleeve comprising a first swiveling internal cylindrical element slidably mounted on the internal pivot about and along the axis of the internal cylindrical pivot, said ball sleeve further comprising a second external element fitted into the housing of the ring, and wherein the second external element comprises an external annular rim intended to be inserted between the inner radial end of the vane and an annular shoulder of the internal ring.