Magnetically driven centrifugal pump

Magnetically driven centerifugal pump comprising:

• a) a fixed assembly comprising a pump barrel made of a carbonaceous material and having an inlet port and an outlet port therein for flow of fluid therethrough, rigid annular bearings and a non-magnetic, non-electrically conductive sealing shell;
• and
• b) a rotating assembly comprising an impeller made of a carbonaceous material, a cylindrical rotor made of a carbonaceous material and having sealed therein permanent tracking magnets which are thereby isolated from transported fluid, said rotor being fixed directly to the impeller to form an impeller-rotor assembly which rests on said annular bearings located at axial extremities of said impeller-rotor assembly, and a driver centerally located with respect to said impeller-rotor assembly and comprising magnets disposed for interacting with said permanent tracking magnets for rotating said impeller-rotor assembly, said sealing shell isolating said driver from said impeller-rotor assembly;
• said impeller-rotor assembly comprising a secondary circuit for circulation of transported fluid including a space defined between said impeller-rotor assembly and said sealing shell.