Stator for directing the inlet of air inside a turbo-engine and method for mounting a vane of said stator
AssigneeSociete Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A."
InventorJacky Naudet
Life of this patent
Estimating the term…
Abstract
A stator for a turbo-engine and a method for mounting the stator serve to improve fixing of the vanes of the stator and resistance of these vanes to impact in the event foreign bodies enter the turbo-engine. The stator includes several vanes radially maintained by their external and internal pivots between an internal ferrule and an external casing. The internal ferrule includes at least one bore intended to receive one of the internal pivots and the external casing includes a mechanism for the radial positioning and locking of the vane so as to make it possible to keep the internal pivot of the vane in the bore.
Claims12
A stator for directing the inlet of air inside a turbo-engine, said stator comprising:
- a set of vanes located radially inside an air intake channel between an internal ferrule and a radially external casing, each vane being provided with an internal pivot and an external pivot respectively integral with internal and external extremities thereof, said internal and external pivots defining the radial axis of the vane,
- the external casing being provided with at least one bore for receiving the external pivot of each said vane, wherein the internal ferrule includes at least one bore for receiving and having embedding therein one of said internal pivots,
- the external casing including a mechanism for radial positioning and locking of at least one of said vanes so as to keep the radial extremity of the internal pivot of said vane in one of said at least one bore provided in the internal ferrule when the vane is mounted in the stator wherein the external casing has a housing for receiving the external extremity of the vane, the bore receiving the external pivot opens inside said housing and wherein the distance between the external extremity of the vane and the radial extremity of the internal pivot is less than the distance between the bottom of said housing and the face of the internal ferrule directed towards the inside of the air intake channel.
A method for mounting vanes of a stator, the vanes being kept radially inside an air intake channel between one internal ferrule and one radially external casing, each vane being provided with an internal pivot and an external pivot respectively internal with internal and external extremities thereof, said external and internal pivots defining the radial axis of each said vane, wherein the method comprises:
- introducing the external pivot of the vane into a bore of the external casing from inside the air intake channel so as to complete a first embedding of the vane,
- pivoting said vane around the radial axis thereof so as to fully drive the external pivot of the vane into the bore of the external casing, and so that the external extremity of the vane abuts against a bottom portion of a housing provided in the external casing to receive the external extremity of the vane,
- introducing a vane radial positioning and locking mechanism from outside of the external casing,
- installing the internal ferrule via axial movement inside the stator,
- pivoting the vane until the leading edge of the vane is brought towards the entrance of the air intake channel,
- radially moving the vane until the extremity of the internal pivot is brought into a bore of the internal ferrule so as to complete a second embedding of the vane, and
- moving the radial positioning and locking mechanism until locking of the vane occurs so as to prevent the internal pivot from becoming dislodged from the bore of the internal ferrule.
A method for mounting vanes of a stator, the vanes being kept radially inside an air intake channel between one internal ferrule and one radially external casing, each said vane being provided with an internal pivot and an external pivot respectively internal with internal and external extremities of the vane, and said internal and external pivots defining the radial axis of the vane, wherein the method comprises:
- introducing the external pivot of the vane into a bore of the external casing from inside the air intake channel so as to complete a first embedding of the vane,
- pivoting said vane around the radial axis thereof so as to fully drive the external pivot of the vane into the bore of the external casing, and so that the external extremity of the vane abuts against a bottom portion of a housing provided in the external casing to receive the external extremity of the vane,
- positioning an antifriction ring inside a bush threaded on an external surface thereof,
- positioning the bush and antifriction ring around the external pivot, from outside the external casing, the bore of the external casing being tapped so as to cooperate with said bush,
- screwing the bush inside the tapped bore of the external casing until the radially internal extremity of the bush comes into contact with the external extremity of the vane,
- installing the internal ferrule via axial movement inside the stator,
- pivoting the vane until the leading edge of the vane is brought towards the entrance of the air intake channel,
- radially moving the vane until the extremity of the internal pivot thereof is brought into a bore of the internal ferrule so as to carry out a second embedding of the vane, and
- fully screwing the tapped bush until the radially internal extremity of the bush comes into contact with the external extremity of the vane.
Dependencies are inferred from the claim text.