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Molten metal pump components

  • US 8,529,828 B2
  • Filed: 11/04/2008
  • Issued: 09/10/2013
  • Est. Priority Date: 07/12/2002
  • Status: Active Grant
First Claim
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1. A rotor shaft for use in a molten metal pump, the rotor shaft comprising:

  • graphite;

    an annular, outer surface;

    a diameter;

    a first end for connecting to a coupling that couples the rotor shaft to a motor shaft; and

    a second end for connecting to a rotor of the molten metal pump, the second end having threads for being threadingly received into an opening in the rotor;

    wherein the first end of the rotor shaft is comprised of graphite, includes a vertically-extending keyway formed in the annular, outer surface, the keyway comprising a groove that is ⅓

    or less the diameter of the rotor shaft, the groove configured for receiving a projection attached to and extending from an inner wall of the coupling, whereby the projection can apply driving force to the rotor shaft through the keyway; and

    wherein the rotor shaft is configured to be removed from the coupling in order to replace the rotor.

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