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Pump system employing liquid filled rotor

  • US 6,626,649 B2
  • Filed: 07/18/2001
  • Issued: 09/30/2003
  • Est. Priority Date: 07/18/2001
  • Status: Expired due to Term
First Claim
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1. A long life motor driven pump system for pressurizing and supplying a thermal transfer liquid that may vary widely in temperature and viscosity, while employing the same liquid internally in the motor for lubrication of bearings, comprising:

  • a regenerative turbine type pump having a housing, an input and output, the pump including an interior chamber in communication with the input and output;

    a motor of the fluid-filled rotor type having a rotor enclosure, a rotor within the enclosure and a motor shaft along a central axis, with first and second shaft ends extending in opposite directions from the rotor, with the first shaft end extending onto the interior chamber of the pump, a stator about the rotor enclosure, the rotor enclosure including end members concentrically disposed about the respective ends of the shaft and providing journal surfaces for supporting hydrodynamic bearing surfaces along the first and second ends of the shaft and the motor further including a motor enclosure about the stator, the structure coupling the pump housing to the motor housing including a low thermal conductivity path therebetween and the end member of the rotor enclosure being disposed about the second end of the shaft including an aperture accessing the interior of the rotor enclosure;

    an end cap member coupled to the motor housing about the second end of the shaft;

    at least one impeller mounted on the first end of the shaft in the interior chamber of the pump; and

    valve means mounted in the aperture of the end member at the second end of the shaft for enabling filling the rotor enclosure with thermal transfer liquid.

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