Patent ID: 9057376
Filing Date: 2015-06-16
Classification: F04D

Abstract:
1. A tube pump for transferring molten metal comprising: a refractory tube having upper and lower end portions; a motor disposed near the upper end portion of said refractory tube; a refractory shaft extending in said refractory tube and connected to said motor near the upper end portion of said refractory tube; a refractory impeller connected to said refractory shaft in the lower end portion of said refractory tube; an upper outlet extending from the upper end portion of said refractory tube through which molten metal flows upon rotation of the impeller; wherein said refractory tube is enclosed at the upper end portion thereof; and a gas source connected at or near the upper end portion of said refractory tube that flows gas into said refractory tube under a pressure which prevents overflow of the molten metal above said outlet.