Low pressure molten metal transfer pump

Patent metadata

Field	Value
Publication number	US-12168987-B2
Application number	US-202118030461-A
Country	US
Kind code	B2
Filing date	Sep 28, 2021
Priority date	Oct 5, 2020
Publication date	Dec 17, 2024
Grant date	Dec 17, 2024

Abstract

A pump for transferring molten metal is provided. The pump includes a motor, a base having an impeller chamber, a shaft connected to the motor at one end, an impeller connected to the other end of the shaft and rotatable in the impeller chamber, and a riser disposed on an upper surface of the base. The base includes a shaft opening and an outlet opening in a top surface. The riser assembly has a first open end facing the base. The first open end is dimensioned to encompass the shaft opening and the outlet opening.

First claim

The invention claimed is:

1. A pump for pumping molten metal comprising a motor, a base defining an impeller chamber, a shaft connected to the motor at one end and an impeller at the other end, the impeller being rotatable in the impeller chamber, and a riser disposed on an upper surface of the base, said base including a shaft opening and an outlet opening in the upper surface, said riser having a first open end facing the base, said first open end being dimensioned to encompass the shaft opening and the outlet opening.

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.

3. The molten metal pump of claim 2 wherein said passage has a longitudinal axis at least substantially parallel to a longitudinal axis of said chamber.

4. The molten metal pump of claim 2 further including a bonded particle filter cage surrounding said base.

5. The molten metal pump of claim 2 wherein the elongated chamber forms a portion of the base.

6. The molten metal pump of claim 5 wherein the portion of the elongated chamber forming the base is interposed between upper and lower sections of the base.

7. The molten metal pump of claim 6 wherein the upper and lower sections of the base are comprised of graphite.

8. The molten metal pump of claim 2 wherein said impeller includes a bottom inlet and side outlets.

9. The molten metal pump of claim 2 wherein each of said elongated chamber, said base, said pumping chamber and said passage are at least substantially cylindrical.

10. The molten metal pump of claim 2 wherein each of said elongated chamber and said base are at least substantially elliptical.

11. The molten metal pump of claim 2 wherein at least one of said elongated chamber and said base are at least substantially rectangular.

12. The molten metal pump of claim 2 wherein the bottom opening of the elongated chamber and a top opening of the passage reside in substantially the same plane.

13. 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 a top end through which said shaft passes and a bottom end defining an opening interfacing with a pumping chamber, the impeller disposed in said pumping chamber, said elongated chamber including an outlet adjacent the top end, a passage disposed between the pumping chamber and the outlet and providing fluid communication between the pumping chamber and the outlet, said pumping chamber having a circumference, said elongated chamber having a perimeter adjacent the outlet, wherein a perimeter of the passage is smaller than the perimeter of the elongated chamber and the perimeter of the pumping chamber.

14. The molten metal pump of claim 13 wherein the elongated chamber has a longitudinal axis and wherein said outlet has a longitudinal axis, and wherein the longitudinal axis of the outlet is at least substantially perpendicular to the longitudinal axis of the elongated chamber.

15. The molten metal pump of claim 13 wherein the passage provides a controlled flow of molten metal such that vortexing and turbulence can be reduced.

16. The molten metal pump of claim 15 wherein the passage is circular in cross-section.

Assignees

• Pyrotek Inc

Inventors

• Tipton Jon
• Horsfall Andrew
• Tetkoskie Jason

Classifications

• F04D29/708

  specially for liquid pumps · CPC title

• F04D29/18

  Rotors (specially for elastic fluids F04D29/26) · CPC title

• F04D7/065 Primary

  for liquid metal · CPC title

• C21C1/06

  Constructional features of mixers for pig-iron · CPC title

• B22D39/00

  Equipment for supplying molten metal in rations · CPC title