The invention discloses a magnetic
fluid coupling passive suspension type double-suction
centrifugal blood pump. The magnetic
fluid coupling passive suspension type double-suction
centrifugal blood pump is characterized in that a rotor provided with impellers and a threaded groove is embedded into a
volute cavity provided with two inlets, the shapes of the inlets become wider from narrow, suspension permanent
magnet sheets are mounted at two ends of the rotor, and suspension permanent
magnet rings are arranged in a
volute. The rotor adopts a conical outer surface, and an equal-
pitch thread groove is formed in the outer surface; the impellers are mounted on the rotor and integrally connected; blood flows into the
volute cavity through the inlets in the two sides of the volute, a
rotating magnetic field is generated after a motor coil is powered on, the suspended permanent magnetic sheets in the rotor are driven to rotate, the impellers are driven to rotate, the blood flows out of an outlet of the volute, and the outer surface of the conical rotor and the threaded groove jointly achieve the effect of draining the blood; and static pressure supporting force is provided for suspensionof the rotor by a
blood film in the gap of the impellers and the inner wall of the volute, permanent
magnet suspension and hydraulic static pressure support jointly guarantee that the rotor is suspended in the volute, and adverse factors such as abrasion and frictional heating between the rotor and the volute are reduced. The magnetic
fluid coupling passive suspension type double-suction
centrifugal blood pump is compact in structure, high in efficiency, large in flow and small in
axial force,
energy consumption of the
blood pump is reduced, and development of the
blood pump to the fourth-generation non-contact bearing type
artificial heart is facilitated.