Tension device graphite component used in molten metal

Patent metadata

Field	Value
Publication number	US-9464636-B2
Application number	US-201514690218-A
Country	US
Kind code	B2
Filing date	Apr 17, 2015
Priority date	Aug 7, 2009
Publication date	Oct 11, 2016
Grant date	Oct 11, 2016

Abstract

A system for applying tension to a component for use in molten metal processing. Preferably, the component includes an outer core and at least one tension rod positioned partially within the outer core. The component is preferably elongated, such as a support post or an impeller shaft. The tension rod applies compression to the outer cover, which makes the outer cover more resistant to breakage if it strikes, or is stricken by, an object.

First claim

What is claimed is:

1. A component for use in a molten metal pump, the component comprising:
an outer core constructed of graphite or ceramic;
a tension rod positioned at least partially inside the outer core, wherein the tension rod applies an axial compressive force to the outer core in order to make the outer core less susceptible to breakage;
wherein there is a gas-transfer conduit inside of the tension rod.

2. The component of claim 1 wherein the tension rod has at least one end, the outer core has a first end and a second end and at least one end of the tension rod extends beyond either the first end or second end of the outer core.

3. The component of claim 2 wherein either the first end or the second end of the outer core has a cap and the end of the tension rod extending beyond the end of the outer core is tightened against the cap.

4. The component of claim 1 wherein the tension rod comprises at least one elongate, metal rod.

5. The component of claim 1 wherein the tension rod comprises at least one elongate, metal cable.

6. The component of claim 1 wherein the tension rod is steel.

7. The component of claim 1 that is a molten metal pump rotor shaft.

8. The component of claim 1 that is a molten metal degassing shaft.

9. The component of claim 1 wherein the tension rod is secured in the component by cement placed inside of the outer core.

10. The component of claim 1 wherein the tension rod is bonded to the outer core.

11. The component of claim 1 wherein the outer core comprises channels and the tension rod is positioned inside one of the channels in the outer core.

12. The component of claim 1 wherein the outer core comprises graphite.

13. The component of claim 1 wherein the outer core comprises ceramic.

Assignees

• Molten Metal Equipment Innovations Llc

Inventors

• Cooper Paul V

Classifications

• Y10T428/292

  In coating or impregnation · CPC title

• C04B2237/62

  Forming laminates or joined articles comprising holes, channels or other types of openings · CPC title

• Y10T428/2958

  Metal or metal compound in coating · CPC title

• C04B2237/84

  Joining of a first substrate with a second substrate at least partially inside the first substrate, where the bonding area is at the inside of the first substrate, e.g. one tube inside another tube · CPC title

• F04D7/065

  for liquid metal · CPC title