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Molten metal pump with protected inlet

  • US 6,533,535 B2
  • Filed: 04/06/2001
  • Issued: 03/18/2003
  • Est. Priority Date: 04/06/2001
  • Status: Expired due to Fees
First Claim
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1. A pump for pumping molten metal, comprising:

  • a) a motor;

    b) a shaft having one end connected to the motor and extending along a longitudinal axis;

    c) an impeller connected to the other end of the shaft;

    d) a base having a chamber in which said impeller is rotatable, said impeller being positioned a specified distance from a wall of said chamber, said base including a base inlet opening;

    e) a guard secured in said base inlet opening that defines an inlet including a plurality of openings through which molten metal can enter the base, said plurality of openings having a maximum dimension that is less than said specified distance and greater than 0.250 inches, said guard including a central opening that accepts said shaft;

    f) a base opening in one of an upper and lower portion of said base that receives said impeller, said base opening being disposed adjacent said inlet; and

    g) a discharge passage in said base through which molten metal can leave said chamber.

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