Pump system employing liquid filled rotor

摘要

A long life rotor pump combination of the type having a liquid filled rotor that uses the liquid being pumped to establish hydrodynamic bearings within the rotor incorporates a pump which can be expanded to include more than one impeller, providing an optionally higher flow rate. Thermal isolation between the motor housing and the pump housing is assured by restricting heat conductivity through the physical structures and through the liquid. The rotor enclosure is formed with a number of engaging but not joined elements maintained under compression established by forces exerted in securing the encompassing motor housing.