Patent ID: 6050782
Filing Date: 2000-04-18
Classification: F04D,F16C

Abstract:
A pump having a tubular rotor (18,51) supported by at least one magnetic bearing, comprising:a stator having an outer stator portion (10,54) and an inner stator shaft (11,56), the tubular rotor being supported concentrically about said inner stator shaft;a motor (30,31,32) for rotating said tubular rotor relative to said inner stator shaft (11,56) and said outer stator portion (10,54),a first pumping step (22) comprising two parallel but oppositely acting pumping portions, formed between said inner stator shaft (11,56) and said tubular rotor (18,51), anda second pumping step (24) comprising two parallel but oppositely acting pumping portions, formed between said outer stator portion (10,54) and said tubular rotor (18,51).