PURPOSE: To easily mold impellers by providing the impellers having suction sections opened to the outside in the axial direction at both ends of a motor shaft, surrounding the impellers with pump outer casings having suction ports connected to a header pipe, connecting both pump outer casings with a pump barrel having a delivery port, and forming a passage between both pump outer casings and a motor frame.
CONSTITUTION: Impellers 3, 4 having suction sections communicated with suction openings 15C, 16C provided on partition plates 15, 16 on the outside in the axial direction are provided at both shaft ends of the main shaft 2 of a motor 1. The impellers 3, 4 are stored in pump outer casings 5, 6. The pump outer casings 5, 6 are provided with suction ports 5a, 6a, and they are connected to a header pipe 10 having a suction port 11a. Both pump outer casings 5, 6 are connected with a pump barrel 7 to form a passage 40 between them and a motor frame 24. The pump barrel 7 is formed with a delivery port 41a communicated with the passage 40.
YAMAMOTO MASAKAZU
MIYAKE YOSHIO
ISEMOTO KOUJI
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