VANE WHEEL FOR RADIAL TURBINE
World Intellectual Property Organization Patent
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Abstract
A vane wheel for a radial turbine comprises a plurality of vanes and a circular main plate on which scallops are formed by cutting out the portion between a negative pressure surface of each of the vanes and a pressure surface of the vane adjacent to vane. A minimum radius portion where the distance from the center of the circular main plate to an edge portion of the scallop is minimum is positioned closer to the pressure surface side from the mid point of the circumferential distance between the negative pressure surface of one vane and the pressure surface of the adjacent vane, so that the cutout portion is asymmetrical between the negative pressure surface of the vane and the pressure surface of the adjacent vane. Collision of fluid with the edge portions of the vanes can prevent the turbine efficiency from lowering. An edge portion of the circular main plate, which edge portion is located between the negative pressure surface-side tip portion of the vane and the minimum radius portion of the circular main plate, is formed with at least one linear portion, circular arc or parabola or a combination of them.
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