PROBLEM TO BE SOLVED: To provide a vertical mixed flow pump capable of increasing discharge amount and improving capacity, with a structure wherein outer diameters of a pump casing, a lifting pipe and the like are set within a range that can be inserted in an opening provided on a floor of a plant, by eliminating the need of a mixed flow impeller having a large diameter.;SOLUTION: An upper stage mixed flow impeller 20 and a lower stage mixed flow impeller 21 which have the same function are attached to a pump main shaft having a vertical line, and these mixed flow impellers 20, 21 are rotatably stored in upper and lower stage pump casings 30, 31. A first sucking/discharging flow passage 12 sucking water into the upper stage pump casing 30 and discharging the water to the lifting pipe 4 by rotations of the upper stage mixed flow impeller 20 is provided. A second sucking/discharging flow passage 13 sucking water into the lower stage pump casing 31 and discharging the water the lifting pipe 4 by rotations of the lower stage mixed flow impeller 21 is provided. The first sucking/discharging flow passage 12 and the second sucking/discharging flow passage 13 are structured in parallel.;COPYRIGHT: (C)2004,JPO
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