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AssigneeBBC Brown, Boveri & Company, Limited
InventorReinhard Fried
Estimating the term…
Blading for a rotating thermal machine consists of an airfoil (1), a root (4) and a shroud plate (5) or a shroud, the tip (2) of the airfoil (1) having a spigot-type step (11) with a semi-circular groove (12) extending around the whole periphery of its generated surface. The shroud plate (5) or the shroud has a recess corresponding to the step (11) with a semi-circular groove (8) extending around the complete periphery. At least one piece of a firmly seated heat-resisting wire (10) is located in the circular duct formed by the grooves (8, 12) as the fastening element between the components (1, 5). The blading is manufactured by pushing and/or pulling the wire (10) sideways into the duct formed by the grooves (8, 12). Optimum material combination, particularly for highly loaded gas turbine blading, is possible by selecting an oxide-dispersion-hardened superalloy with longitudinally directed columnar crystals for the airfoil (1) and a non-oxide-dispersion-hardened cast or forged superalloy for the shroud plate (5) or the shroud.
A method manufacturing rotating thermal machine blading, consisting of an airfoil (1), a root (4) and a shroud plate (5) or a shroud, by fastening a shroud plate (5) or a shroud to the tip (2) of the airfoil (1), wherein the tip (2) is provided with a spigot-type step (11) similar to its profile, which step is provided with a groove (12) of semi-circular cross-section on its generated surface in a plane at right angles to the radial longitudinal axis of the blading, and wherein the shroud plate (2) is provided with a recess (7) corresponding to the profile of the step (11), in the internal generated surface of which recess is machined a groove (8) of semicircular cross-section with the same diameter as that of the groove (12) in the step (11), wherein, furthermore, these components (1;
Blading for a rotating thermal machine, consisting of an airfoil (1), a root (4) and a shroud plate (5) or a shroud, either of the last two being fastened to the tip (2) of the airfoil (1), wherein the tip (2) of the airfoil (1) has a spigot-type step (11) with an external semicircular groove (12) extending around the whole periphery of the generated surface, wherein the shroud plate (5) or the shroud has a recess (7), corresponding to the step (11) of the airfoil (1), with an internal semi-circular groove (8) extending around the whole of the periphery, and wherein the circular cross-section duct thus formed by the grooves (8, 12) mentioned is filled in such a way by one or more bent, firmly seating pieces of a heat-resisting wire (10) that a purely mechanical, firm connection exists between the tip (2) of the airfoil (1) and the shroud plate (5) or the shroud.
Dependencies are inferred from the claim text.