To provide a pump rotatable at a high speed while minimizing wear between a bearing and a shaft.
This pump comprises an impeller 1 having a large number of vanes 2 on the outer periphery of a cylindrical part 1A and having a rotor magnet 3 on the inner periphery of the cylindrical part 1A, a motor stator 4 installed on the inner peripheral side of the rotor magnet 3 and rotatingly driving the impeller 1, a separator 6 partitioning airtight the impeller 1 from the motor stator 4, and a pump casing 5 having a suction port 9 and a discharge port 10 for sucking and discharging a liquid. Dynamic pressure generating grooves 12 generating dynamic pressure by the rotation of the impeller 1 are formed in the outer peripheral surface 8a of the bearing of the impeller 1 and at least one of the cylindrical surface 6a of the separator 6 and the cylindrical surface 5a of the pump casing 5 facing the outer peripheral surface of the bearing.
| JP2005180382 | PERIPHERAL PUMP |
Nakamura Tomoyuki
Masakazu Ito
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