Patent ID: 6976947

Claim:
In a centrifugal extractor of construction in which a rotor housed in a rotor housing is rotatably journaled in a state of being suspended by a main shaft extended upwardly, said main shaft is rotated and driven by a motor to thereby rotate the rotor, an aqueous phase and an organic phase supplied to the outer circumference of the rotor are mixed between the rotor housing and the rotor, a mixed phase is sucked into the rotor and is separated into two phases in a centrifugal force field internally of the rotor, and the separated phases are discharged, a centrifugal extractor of non-contact journaled construction characterized in that the outside of said main shaft is surrounded air-tightly by a drive-portion housing coupled to said rotor housing, the main shaft has a thrust magnetic disk on the upper end thereof and has at least one radial magnetic cylinder and a motor-rotor portion in the circumference thereof, thrust bearing electromagnets are incorporated up and down so as to hold the thrust magnetic disk therebetween into the inner surface of the drive-portion housing and covered by non-magnetic anticorrosive protective plates, at least one radial bearing electromagnet and a motor-stator portion are incorporated into the inner surface of the drive-portion housing opposite the at least one radial magnetic cylinder and the motor-rotor portion, respectively, and covered by a non-magnetic anticorrosive protective pipe, the motor-rotor portion is also covered by a non-magnetic anticorrosive protective can, and touch-down bearings are disposed in the vicinity of the upper end and in the vicinity of the lower end, respectively, of the main shaft.