Angular diffuser sector for a turbine engine compressor, with a vibration damper wedge
View Patent ↗An angular diffuser sector for a turbine engine compressor is provided. The sector includes an inner shroud; an outer shroud; a vane; a casing element mounted at least in part around one of the shrouds and having an open groove facing an axial end of the corresponding shroud; a wedge-forming fitting interposed between the casing element and the corresponding shroud, the wedge presenting a first surface that contacts with a bearing surface of the axial end of the corresponding shroud, and a second surface that is inclined relative to the first surface and that contacts with a corresponding sloping surface of the groove in the casing element; and a device that exerts an axial force on the wedge so as to keep its first surface in contact with the bearing surface and its second surface in contact with the sloping surface of the groove in the casing element.
1. An angular diffuser sector for a turbine engine compressor, the sector comprising:
an inner shroud;
an outer shroud;
at least one vane extending radially between the shrouds and connected thereto via radial ends thereof;
a casing element mounted at least in part around one of the shrouds, said casing element having an open groove entirely formed in the casing element facing an axial end of the corresponding shroud;
a wedge-forming fitting interposed radially between the casing element and the corresponding shroud, the wedge presenting a first surface for coming into contact with a bearing surface of the axial end of the corresponding shroud, the bearing surface presenting a radial support, and a second surface that is inclined relative to the first surface and that is to come into axial contact with a corresponding sloping surface of the groove in the casing element; and
elastic means for exerting an elastic axial force between the wedge and the casing element so as to keep the first surface in radial contact with the bearing surface and the second surface in axial contact with the sloping surface of the groove in the casing element.
2. A diffuser sector according to claim 1 , wherein the first and second surfaces of the wedge form an angle therebetween lying in a range of 20° to 45°.
3. A diffuser sector according to claim 1 , wherein the first surface and the second surface of the wedge form an angle that is open downstream.
4. A diffuser sector according to claim 1 , wherein the elastic means for exerting the axial force on the wedge comprise at least one spring bearing axially against the wedge.
5. A diffuser sector according to claim 4 , wherein the elastic means for exerting the axial force on the wedge comprise an undulating annular spring bearing axially both against a radial face of the groove in the casing element and against a groove formed in the wedge fitting.
6. A diffuser sector according to claim 4 , wherein the elastic means for exerting the axial force on the wedge comprise a plurality of helical springs, each received in a cavity in the casing element and bearing axially against a radial face of the wedge.
7. A turbine engine diffuser comprising a plurality of diffuser sectors according to claim 1 .
8. A turbine engine including at least one diffuser according to claim 7 .
9. A diffuser sector according to claim 2 , wherein the first surface and the second surface of the wedge form an angle that is open downstream.
10. A diffuser sector according to claim 2 , wherein the elastic means for exerting the axial force on the wedge comprise at least one spring bearing axially against the wedge.
11. A diffuser sector according to claim 3 , wherein the elastic means for exerting the axial force on the wedge comprise at least one spring bearing axially against the wedge.
12. A diffuser sector according to claim 1 , wherein the wedge is disposed at a downstream end of the outer shroud, and the groove in the casing opens downstream.