Patent ID: 6524066
Filing Date: 2003-02-25
Classification: F04D

Abstract:
In a pump for pumping molten metal including a motor, a shaft having one end connected to the motor, an impeller connected to the other end of the shaft, a base having an impeller chamber in which the impeller is rotatable, concentric openings in upper and lower portions of said base, and an elongated discharge passageway that extends from said impeller chamber, the improvement wherein the impeller is made of a non-metallic, heat resistant material, and comprises a generally cylindrical shaped body having a central rotational axis aligned with said concentric openings, first and second end faces extending transverse to the central axis, a side wall extending between the first and second end faces, a plurality of first inlet openings circumferentially spaced apart from each other on said first end face, a plurality of second inlet openings circumferentially spaced apart from each other on said second end face, connecting passages extending in the body of said impeller and outlet openings located at said side wall, wherein each of said outlet openings is connected to both said first inlet openings and said second inlet openings by said connecting passages.