Patent ID: 6491498
Filing Date: 2002-12-10
Classification: F01D,F05D

Abstract:
An improved turbine blade comprising:a root section, a platform section of generally planar shape connected to said root, an airfoil extending outward from said platform, said airfoil having a platform end connected to said platform, and a tip end opposite said platform end, a shroud extending outward from said tip end and attached thereto, said shroud comprising: a first surface fixed to said tip end of said airfoil; 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; a pair of knife edges extending outward from said second surface, each of said knife edges extending across said second surface and having knife ends at said sidewalls; at least one recessed pocket in said second surface, said pocket extending towards said first surface to a predetermined depth wherein each of said at least one recessed pockets varies in depth from the center of said shroud towards said radially extending sidewalls, with the deepest location of each of said at least one recessed pockets immediately adjacent said knife ends.