| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly efficient multi-stage pump used for a general-purpose multi-stage pump. SOLUTION: In the multi-stage pump, a plurality of impellers and guide vanes are provided to a main shaft driven by a motor, a casing is provided to surround each guide vane, one stage of a pump is configured by a pair of the impellers, the guide vanes, and the casings, and a plurality of the stages are mounted in the multi-stage pump. A flow passage in the casings from the impellers to the guide vanes is divided by a disc provided along a plane at a right angle to the main shaft. Hydraulic power loss occurring on the way from the impellers to the guide vanes is reduced and the highly efficient multi-stage pump is supplied. COPYRIGHT: (C)2009,JPO&INPIT
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