Shaft and post assemblies for molten apparatus

Patent metadata

Field	Value
Publication number	US-2024198416-A1
Application number	US-202218287946-A
Country	US
Kind code	A1
Filing date	Apr 25, 2022
Priority date	Apr 23, 2021
Publication date	Jun 20, 2024
Grant date	—

Abstract

A molten metal pump post that includes an elongated rod of a first material that is heat resistant and an inner member at least partially surrounding the elongated rod. The inner member is of a second material. The elongated rod is operable due to a difference in a coefficient of thermal expansion between the elongated rod and the inner member which creates a compressive force.

First claim

1 . A molten metal pump post comprising:
an elongated rod of a first material that is heat resistant; an inner member at least partially surrounding the elongated rod wherein the inner member is of a second material; and wherein the elongated rod is operable due to a difference in a coefficient of thermal expansion between the elongated rod and the inner member which creates a compressive force.

2 . The molten metal pump post of claim 1 wherein the first material of the elongated rod provides no compressive force at room temperature and provides compressive force at a temperature above 500° C.

3 . The molten metal pump post of claim 1 wherein the first material of the elongated rod comprises steel or a steel alloy.

4 . The molten metal pump post of claim 1 wherein the second material of the inner member comprises tungsten and/or titanium.

5 . The molten metal pump post of claim 4 wherein the elongated rod is preloaded with tension at room temperature and does not unload at a temperature about 500° C.

6 . The molten metal pump post of claim 1 where in the difference in coefficient of thermal expansion is at least 0.001852 ppm/° C.

7 . The molten metal pump post of claim 1 wherein the difference in coefficient of thermal expansion is at least 0.011109 ppm/° C.

8 . The molten metal pump post of claim 1 wherein the elongated rod comprises carbon-carbon.

9 . The molten metal pump post of claim 8 wherein the elongated rod is preloaded with tension at room temperature and does not unload at a temperature about 500° C.

10 . The molten metal pump post of claim 8 further comprising a stainless steel flange coupled to the elongated rod.

11 . The molten metal pump of claim 1 further comprising an outer sheath.

12 . The molten metal pump of claim 11 wherein the inner member is disposed between the rod and the outer sheath.

13 . An assembly for attaching an associated molten metal pump post to a component of a molten metal pump, the assembly comprising a rod having a first end that accommodates an elongated refractory element and an opposed end at least partially surrounded by an inner member wherein the assembly uses thermal expansion to create a compressive force.

14 . The assembly of claim 13 wherein the rod comprises steel or a steel alloy.

15 . (canceled)

16 . (canceled)

17 . (canceled)

18 . The assembly of claim 13 further comprising an outer sheath.

19 . The assembly of claim 18 wherein the inner member is disposed between the rod and the outer sheath.

20 . The assembly of claim 13 wherein the inner member comprises carbon-carbon and a packing material, such as a ceramic fiber, provided to reduce exposure of the inner member to an external atmosphere.

21 . A molten metal pump comprising:
an elongated rod of a first material that is heat resistant; an inner member at least partially surrounding the elongated rod wherein the inner member is of a second material; and wherein the elongated rod is operable due to a difference in a coefficient of thermal expansion between the elongated rod and the inner member which creates a compressive force.

22 . The molten metal pump of claim 21 further comprising a cap and a base.

23 . The molten metal pump post of claim 22 wherein the cap is removably coupled to the base.

Assignees

• Pyrotek Inc

Inventors

• Horsfall Andrew
• Cullen Sean
• Tipton John

Classifications

• B22D1/002

  Treatment with gases (C21C7/072, C22B9/05 take precedence) · CPC title

• F27D27/005

  Pumps · CPC title

• F04D7/065 Primary

  for liquid metal · CPC title

• B22D39/00 Primary

  Equipment for supplying molten metal in rations · CPC title

• B22D39/02

  having means for controlling the amount of molten metal by volume · CPC title