Chamfer rail pockets for turbine vane shrouds
AssigneeUnited Technologies Corporation
InventorTracy A. Propheter-Hinckley
Life of this patent
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Abstract
A shroud rail for retaining a feather seal in a vane shroud of a gas turbine engine comprises a slot for, receiving the feather seal, and a chamfer rail pocket for lightening the shroud rail. The slot traverses the vane shroud and includes a slot base extending from a leading edge to a trailing edge of the shroud rail, and a slot wall extending generally perpendicularly from the slot base. The chamfer rail pocket comprises a pocket wall extending along the slot wall, and a chamfer wall extending from the pocket wall at an angle oblique to the slot base.
Claims25
A shroud rail for retaining a feather seal in a vane shroud of a gas turbine engine, the shroud rail comprising:
- a slot traversing the vane shroud and configured for receiving a feather seal, the slot comprising:
- a slot base extending from a leading edge to a trailing edge of the shroud rail;
- and
- a slot wall extending generally perpendicularly from the slot base;
- a chamfer rail pocket for lightening the shroud rail, the chamfer rail pocket comprising:
- a pocket wall extending along the slot wall;
- and
- a chamfer wall extending from the pocket wall at an angle oblique to the slot base.
A method for producing a vane shroud having a rail pocket, the method comprising:
- casting a vane shroud having:
- a generally conical shroud body having a leading edge, a trailing edge and a side edge disposed between the leading edge and the trailing edge;
- a leading edge retainment block disposed along the side edge at the leading edge;
- a trailing edge retainment block disposed along the side edge at the trailing edge;
- and
- a chamfer rail block disposed between the leading edge and trailing edge retainment blocks, the chamfer rail block comprising:
- a pocket wall extending generally perpendicularly from the shroud body;
- and
- a chamfer wall extending from the pocket wall at an angle oblique to the shroud body;
- and
- machining a feather seal slot into the side edge to form a leading edge retainment tab at the leading edge retainment block, a chamfer rail pocket at the chamfer rail block, and a trailing edge retainment tab at the trailing edge retainment block.
A vane shroud for a stator vane of a gas turbine engine, the vane shroud comprising:
- a body portion for attachment to an inner or outer diameter end of a stator vane;
- a leading edge portion;
- a trailing edge portion displaced axially from the leading edge;
- a first side edge disposed between the leading edge portion and the trailing edge portion, and
- a first rail slot extending along the first side edge for securing a first feather seal;
- wherein the first rail slot includes a rail pocket comprising:
- a pocket wall extending from alongside the rail slot;
- an overhang portion that extends from the pocket wall over the rail slot;
- and
- a declined top surface that forms a fillet between the pocket wall and the overhang portion.
A vane shroud for a stator vane of a gas turbine engine, the vane shroud comprising:
- a body portion for attachment to an inner or outer diameter end of a stator vane;
- a leading edge portion;
- a trailing edge portion displaced axially from the leading edge;
- a first side edge disposed between the leading edge portion and the trailing edge portion, and
- a first rail slot extending along the first side edge for securing a first feather seal;
- wherein the first rail slot includes a rail pocket having a declined top surface comprising an arcuate surface.
A vane shroud for a stator vane of a gas turbine engine, the vane shroud comprising:
- a body portion for attachment to an inner or outer diameter end of a stator vane;
- a leading edge portion;
- a trailing edge portion displaced axially from the leading edge;
- a first side edge disposed between the leading edge portion and the trailing edge portion,
- a first rail slot extending along the first side edge for securing a first feather seal, wherein the first rail slot includes a rail pocket having a declined top surface;
- a leading edge retainment tab configured for securing the first feather seal in the slot at the leading edge;
- a trailing edge retainment tab configured for securing the first feather seal in the slot at the trailing edge;
- and
- a mid-span retainment tab along the rail pocket between the leading edge retainment tab and the trailing edge retainment tab.
Dependencies are inferred from the claim text.