| 摘要 |
PROBLEM TO BE SOLVED: To provide a radial impeller, simplifying a metal mold for mass-production of a radial impeller to heighten the production efficiency while attaining high efficiency of the radial impeller of a centrifugal fluid machine and realizing a low-noise pump. SOLUTION: In the centrifugal fluid machine such as a centrifugal pump, the radial impeller is so constructed that a blade pressure surface 6 of the radial impeller 1 is shaped like a two-dimensional curved surface, a blade negative pressure surface 7 is shaped like a three-dimensional curved surface, the blade thickness 19 of the impeller hub 3 side is made larger than the blade thickness 19 of an impeller rear face shroud 5 side, and the blade thickness 19 is gradually decreased as it goes from the impeller hub 3 side toward the impeller rear face shroud 5 side, thereby gradually decreasing the blade inlet angle 16 of the radial impeller 1 as it goes from the impeller hub 3 side toward the impeller rear face shroud 5 side. COPYRIGHT: (C)2005,JPO&NCIPI
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