Turbine blade shroud cutter tip
OwnerRichard Seleskiinventor
Life of this patent
Estimating the term…
Abstract
A shroud for use with a turbine blade is disclosed wherein the shroud provides at least one knife edge with at least one tooth for cutting a groove in a compliant rub strip that minimizes wear on the knife edge. The tooth is positioned along the knife edge inward of the ends of the knife edge and a distance from an airfoil stackline such that the moment created by the tooth mass and its effect on shroud bending stress is significantly reduced, thereby resulting in increased turbine blade durability.
Claims16
A turbine blade having reduced bending stresses at a blade tip region, said turbine blade comprising:
- an attachment extending generally parallel to an axis and having a plurality of serrations generally parallel with said axis;
- a neck extending radially outward from said attachment;
- a platform of generally planar shape extending radially outward from said neck;
- an airfoil extending radially outward from said platform and having a generally radially extending stacking line;
- a shroud extending radially outward from said airfoil, said shroud comprising:
- a first surface fixed to said airfoil opposite said platform;
- a second surface in spaced relation to and generally parallel to, said first surface;
- a plurality of radially extending sidewalls, generally perpendicular to, and connecting said first and second surfaces;
- at least one knife edge extending outward from said second surface, said knife edge extending across said second surface, having a first height, and knife ends at said sidewalls;
- and,
- at least one tooth positioned immediately adjacent said at least one knife edge inward of said knife ends and a distance from said stacking line.
A shroud for use with a turbine blade for reducing bending stresses at a blade tip region, said shroud comprising:
- a first surface fixed to an airfoil, said airfoil having a stacking line extending therethrough;
- a second surface in spaced relation to and generally parallel to, said first surface;
- a plurality of radially extending sidewalls, generally perpendicular to, and connecting said first and second surfaces;
- at least one knife edge extending outward from said second surface, said knife edge extending across said second surface, having a first height, and knife ends at said sidewalls;
- and,
- at least one tooth positioned immediately adjacent said at least one knife edge inward of said knife ends and a distance from said stacking line.
Dependencies are inferred from the claim text.