US 12,168,987 B2
Low pressure molten metal transfer pump
Jon Tipton, Aurora, OH (US); Andrew Horsfall, Aurora, OH (US); and Jason Tetkoskie, Aurora, OH (US)
Assigned to Pyrotek, Inc., Spokane, WA (US)
Appl. No. 18/030,461
Filed by PYROTEK, INC, Spokane, WA (US)
PCT Filed Sep. 28, 2021, PCT No. PCT/US2021/052403
§ 371(c)(1), (2) Date Apr. 5, 2023,
PCT Pub. No. WO2022/076202, PCT Pub. Date Apr. 14, 2022.
Claims priority of provisional application 63/087,685, filed on Oct. 5, 2020.
Prior Publication US 2023/0383754 A1, Nov. 30, 2023
Int. Cl. F04D 7/06 (2006.01); F04D 29/18 (2006.01); F04D 29/70 (2006.01)
CPC F04D 7/065 (2013.01) [F04D 29/18 (2013.01); F04D 29/708 (2013.01)] 16 Claims
OG exemplary drawing
 
2. A molten metal pump comprising a body defining an elongated chamber, said elongated chamber configured to receive a shaft and impeller assembly, said body comprised of a refractory, ceramic or graphite material, said elongated chamber including an open top through which said shaft passes and a bottom opening interfacing with a base defining a pumping chamber, the impeller disposed in said pumping chamber, said pumping chamber including a bearing interfacing with the impeller, said base including a passage in an upper surface, said passage being in fluid communication with the elongated chamber and the pumping chamber, said base having a circumference and said body having a circumference, wherein the base circumference is only slightly larger, or the same or smaller than the circumference of the body, and wherein a circumference of a top opening of the passage is less than 20% of the circumference of the pumping chamber.