| 摘要 |
PROBLEM TO BE SOLVED: To efficiently circulate a fluid between an inner space of a can and a pump chamber. SOLUTION: This pump is provided with a stator fixed to a motor case, a rotor of which the shaft penetrated through a rotor main body is supported rotatably to the motor case, the cylindrical can be connected water-tightly to a case front wall and a case rear wall of the motor case to partition the stator and the rotor therebetween, a washer fit around a case front wall side in the shaft to regulate axis-directional motion, and the pump chamber formed adjacently to the case front wall to contain impellers attached to a front end of the shaft in its inside, and a circulation passage is formed to circulate the fluid between the inner space of the can and the pump chamber, in the pump. The rotor main body has a fluid passage formed penetratedly along an axial direction, and the washer is provided with a radial-directional flow forming means for imparting a radial-directional flow to the fluid sucked from the fluid passage in accompaniment to rotation of the rotor.
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