摘要 |
A mixer pump (47) used in a waste tank (49) for mobilizing high-level radioactive liquid waste having a column assembly (51) containing power cables (171), a motor housing (53) with electric motor means (57) which includes a stator can (69) of a stator assembly (59,61,63,69) and a rotor can (71) of a rotor assembly, and an impeller assembly (55) with an impeller (87) connected to a shaft (81) of the rotor assembly. The column assembly locates the motor housing with the electric motor means adjacent to the impeller which creates an hydraulic head, and which forces the liquid waste into the motor housing to cool the electric motor means and to lubricate radial (80,91) and thrust bearing (92) assemblies. Hard-on-hard bearing surfaces of the bearing assemblies and a ring assembly between the impeller and electric motor means act to grind down large particles in the liquid waste flow. These larger particles are received in slots (88) in the static bearing members of the radial bearing assemblies. Only solid waste particles smaller than the clearances in the system can pass therethrough, thereby resisting damage to and the interruption of the operation of the mixer pump. <IMAGE> |