Patent ID: 9057377
Filing Date: 2015-06-16
Classification: F04D,F27D

Abstract:
1. A pump for pumping molten metal comprising: a refractory base that can be submerged in a bath of molten metal, wherein said base includes an impeller chamber and includes at least one inlet opening and outlet opening that communicate with said impeller chamber; a refractory shaft sleeve having upper and lower end portions; a motor; a refractory shaft extending in said shaft sleeve and connected to said motor; a refractory impeller connected to said shaft and rotatable in said impeller chamber; a gas source that flows inert gas into said shaft sleeve under pressure, the gas being released from said shaft sleeve into the molten metal; a regulator that regulates at least one of flow rate and pressure of the gas; and wherein said shaft sleeve is spaced from said base so as to leave a gap between said shaft sleeve and said base, and said regulator regulates at least one of flow rate and pressure of the gas while the gas is released from said shaft sleeve into the gap.