Patent ID: 6290460
Filing Date: 2001-09-18
Classification: F04D,F05B,F05D

Abstract:
A centrifugal fluid machine comprising:a casing;a rotating shaft within said casing, said rotating shaft having a longitudinally extending axis of rotation;a plurality of impeller vanes fixed to said rotating shaft; anda plurality of diffuser vanes fixed to said casing, said plurality of diffuser vanes cooperating with said plurality of impeller vanes in at least one stage in each of which a trailing edge of each impeller vane rotates about the axis of rotation and past a leading edge of each of the diffuser vanes, and in each of which an end portion of said impeller vanes adjacent said trailing edges and a beginning portion of said diffuser vanes adjacent said leading edges are projected in a flow passage extending in a radial direction perpendicular to the axis of rotation; wherein, on a plane developed from a circular cylindrical development on which is projected one stage of impeller vane trailing edges and diffuser vane leading edges, the impeller vane trailing edges are perpendicular to the diffuser vane leading edges.