G - Physics – 21 – C
Patent
G - Physics
21
C
G21C 19/00 (2006.01) F04D 7/04 (2006.01) F04D 7/08 (2006.01) F04D 13/06 (2006.01) F04D 13/08 (2006.01) F04D 29/04 (2006.01) F04D 29/06 (2006.01) G21C 19/02 (2006.01) G21F 9/22 (2006.01)
Patent
CA 2170832
A transfer pump used in a waste tank for transferring high-level radioactive liquid waste from a waste tank and having a column assembly, a canned electric motor means, and an impeller assembly with an upper impeller and a lower impeller connected to a shaft of a rotor assembly. The column assembly locates amotor housing with the electric motor means adjacent to the impeller assembly which creates an hydraulic head, and which forces the liquid waste into the motor housing to cool the electric motor means and to cool and/or lubricate the radial and thrust bearing assemblies. Hard-on-hard bearing surfaces of the bearing assemblies and a ring assembly between the upper impeller and electric motor means grind large particles in the liquid waste flow. Slots in the static bearing member of the radial bearing assemblies further grind down the solid waste particles so that only particles smaller than the clearances in the system can pass therethrough, thereby resisting damage to and the interruption of the operation of the transfer pump. The column assembly is modular so that sections can be easily assembled, disassembled and/or removed. Asecond embodiment employs a stator jacket which provides an alternate means for cooling the electric motor means and lubricating and/or cooling the bearing assemblies, and a third embodiment employs a variable level suction device which allows liquid waste to be drawn into the transfer pump from varying and discrete levels in the waste tank.
Denmeade Timothy J.
Guardiani Richard F.
Nyilas Charles P.
Pollick Richard D.
Bereskin & Parr
Westinghouse Electric Corporation
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