| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-stage motor pump capable of minimizing the outside diameter of the pump as much as possible without making a passage structure complicated. SOLUTION: In this multistage motor pump which introduces treated fluid discharged from an impeller 14 on a first stage and flowing to one side in an axial direction into an impeller 15 on a second stage as a flow in the other direction, a discharge side pump casing 3 in which the impeller 15 on the second stage is accommodated inside is provided. The discharge side pump casing 3 has first opening parts 51 to 54 which make the treated fluid flow to one side in the axial direction, a second opening part 57 which introduces the flow in the other direction into the impeller 15 on the second stage, and passage walls 60 to 63 for forming a plurality of volute passages 55, 56 which introduce the treated fluid discharged from the impeller 15 on the second stage to the outside in the radius direction. COPYRIGHT: (C)2003,JPO
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