| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of contamination by preventing contact of a peripheral wall with a rotating part (a rotor and an impeller) in operation of a pump, and to float the impeller under liquid in a balanced state by automatically controlling thrust force applied to the impeller. SOLUTION: In this pump, the rotor 8 is a non-magnetic hollow cylinder of a good electric conductor, and a rotating magnetic field generator generates rotation force and electromagnetic repulsion in the rotor 8 to suppress contact by a liquid film. The impeller 10 can be floated under the liquid in the balanced state by automatically controlling a flow rate of the liquid flowing through the impeller 10 upper face, i.e., into the rotor 8, according to a position of the impeller 10, and automatically regulating pressure of the impeller 10 upper face by a circulation hole and a constant-thickness plate 9 inserted in a central hole of an impeller main plate 10-1. A pressure regulator can stabilize the pressure of the impeller 10 upper face further, while a controller can stabilize the balanced state of the impeller 10 under the liquid further.
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