| 摘要 |
PROBLEM TO BE SOLVED: To improve pump performance even when miniaturizing a pump, by inexpensively improving pumping performance and pump efficiency, by preventing reduction in water flow resistance in a suction port mouth part with simple structure. SOLUTION: This impeller structure of the pump is provided with a spiral part 40 such that the fluid flowing direction draws a spiral shape, on an inner peripheral surface 22a of the suction port mouth part 22. COPYRIGHT: (C)2009,JPO&INPIT
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