Electromechanical attachment of inert electrode to a current conductor

• US 6,264,810 B1
• Filed: 12/14/1999
• Issued: 07/24/2001
• Est. Priority Date: 12/14/1999
• Status: Expired due to Term

• Current Assignee: Elysis Limited Partnership
• Original Assignee: Alcoa Incorporated (Howmet Aerospace, Inc.)
• Inventors: Woods, Robert W., Bhattcharyya, Rabindra K., Stol, Israel, Pien, S. John
• Primary Examiner(s): Bell, Bruce F.
• Application Number:
  US09/461,484
• Time in Patent Office: 588 Days
• Field of Search: 204/286.1, 204/288.1, 204/288.4, 204/288.5, 204/297.01, 204/297.13, 204/297.15, 204/279, 204/289
• US Class Current: 204/286.1
• CPC Class Codes: C22B 21/00 Obtaining aluminium
• CPC Class Codes: C25C 3/12 Anodes
• CPC Class Codes: C25C 7/02 Electrodes consumable anodes for the refining the metals C25C1/00 - C25C5/00; Connections thereof
• CPC Class Codes: F27D 11/10 Disposition of electrodes automatic control of temperature G05D23/00; electric discharge apparatus H01T; arrangements for feeding or guiding electrodes H05B7/10; automatic control of power by positioning of electrodes H05B7/144
• CPC Class Codes: Y02P 10/25 Process efficiency

Abstract

A coupling for an inert electrode for refining a metal is provided. The coupling includes an electrode assembly and an electrically conductive support structure assembly. The support structure assembly includes a mechanical connection and an electrical connection which are in spaced relation. The mechanical connection holds the electrical connection in compression.

Claims

1. A coupling for an inert electrode for refining a metal, said coupling comprising:

an electrode assembly;

an electrically conductive support structure assembly coupled to said electrode assembly, said support structure assembly comprising a mechanical connection and a separate electrical connection;

said mechanical connection and said electrical connection are in a spaced relation to each other; and

said mechanical connection holds said electrical connection in compression.

2. The coupling of claim 1, wherein said electrode assembly comprises a cermet material.

3. The coupling of claim 2, wherein said electrical connection comprises:

an annular ridge having a flat edge on said electrode assembly; and

a flat connection on said support structure assembly;

where said annular ridge flat edge is contacting said support structure flat edge connection.

4. The coupling of claim 3, wherein said electrode assembly is welded to said support structure assembly at said electrical connection.

5. The coupling of claim 1, wherein said mechanical connection comprises a mechanical anchor assembly and said electrical connection comprises a double tapered female connection.

6. The coupling of claim 5, wherein said electrode assembly has a cavity and an upper surface, said mechanical connection coupled to said electrode assembly at said cavity, said electrical connection coupled to said electrode assembly upper surface.

7. The coupling of claim 6, wherein said upper surface includes a double tapered male connection, and wherein said mechanical anchor assembly is disposed in said cavity and said double tapered female connection contacts said double tapered male connection.

8. The coupling of claim 7, wherein said electrode assembly comprises a cermet material.

9. The coupling of claim 1, wherein said electrode assembly includes an electrical connection and a mechanical connection;

said electrode assembly coupled to, and supported by, said support structure assembly mechanical connection,

said electrode assembly coupled to, and in electrical communication with, said support structure assembly electrical connection.

10. The coupling of claim 9, wherein said electrode assembly has a weight and said support structure mechanical connection includes an anchor assembly having an anchor member;

said anchor member is shaped to uniformly distribute said weight of said electrode assembly.

11. The coupling of claim 10, wherein said anchor comprises a disk having a double tapered edge.

12. The coupling of claim 11, wherein said disk has a medial opening having a threaded surface;

and said anchor assembly includes a threaded rod;

said anchor is coupled to said support structure by said threaded rod.

13. The coupling of claim 12, wherein said electrode assembly includes an outer shell and a core;

said outer shell is in electrical communication with said core.

14. The coupling of claim 13, wherein said core is bowl shaped having a bottom wall, and upwardly extending side wall coupled to said bottom wall and an interior cavity within said bottom wall;

said anchor is disposed within said interior cavity; and

said male double tapered connection is disposed on said core.

15. The coupling of claim 14, wherein said core bottom wall and side wall have an outer surface;

said outer shell has an inner surface;

said outer shell inner surface overlays and is in electrical communication with, said core outer surface.

16. The coupling of claim 15, wherein said outer shell comprises a cermet material.

17. The coupling of claim 16, wherein a conductive material is disposed between said double tapered male connection and said double tapered female connection.

18. The coupling of claim 17, wherein a cover is disposed between said support structure and said electrode assembly defining a space between said cover and said core and said cover.

19. The coupling of claim 18, wherein at least one heater is disposed in said space defined by said cover and said electrode assembly.

20. The coupling of claim 10, wherein said anchor comprises an outer toroid, a hub, and a plurality of spokes, said spokes coupling said hub to said outer toroid.

21. The coupling of claim 20, wherein said inner toroid has a medial opening having a threaded surface;

and said anchor assembly includes a threaded rod;

said anchor is coupled to said support structure by said threaded rod.

22. The coupling of claim 21, wherein said support structure is a hollow cylindrical tube having an inner ledge;

said threaded rod coupled to said ledge.

23. The coupling of claim 22, wherein said threaded rod includes a first threaded portion and a second threaded portion;

said second threaded portion is engaged with said anchor; and

said first threaded portion coupled to said support structure.

24. The coupling of claim 23, wherein said anchor assembly includes:

clamping ring; and

a nut;

said nut engaged with said first threaded portion;

said nut coupled to said clamping ring, biasing said clamping ring against said support structure ledge.

25. The coupling of claim 24, wherein said anchor assembly includes a spherical washer;

and where said nut is a spherical nut;

said washer disposed on said threaded rod between said spherical nut and said clamping ring.

26. The coupling of claim 25, wherein said anchor assembly includes a plurality of insulator sleeves;

said sleeves disposed between said clamping ring and said support structure.

27. The coupling of claim 26, wherein said electrode assembly includes an outer shell and a core;

said outer shell is in electrical communication with said core.

28. The coupling of claim 27, wherein said core is bowl shaped having a bottom wall, and upwardly extending side wall coupled to said bottom wall and an interior cavity within said bottom wall;

said anchor is disposed within said interior cavity; and

said male double tapered connection is integral to said core.

29. The coupling of claim 28, wherein said core bottom wall and side wall have an outer surface;

said outer shell has an inner surface;

said outer shell inner surface overlays and is in electrical communication with, said core outer surface.

30. The coupling of claim 29, wherein said outer shell is made of cermet.

31. A method of coupling an inert electrode assembly to a current conductor comprising the steps of:

providing an inert electrode assembly;

providing an electrically conductive support structure assembly comprising a separate mechanical connection and an electrical connection;

coupling said electrode assembly to said support structure assembly so that said mechanical connection holds said electrical connection in compression.

32. The method of claim 31, wherein said mechanical connection includes a threaded rod and said coupling step includes rotating said treaded rod until said electrical connection is in compression.

33. A method of coupling an inert electrode assembly to a current conductor comprising the steps of:

providing a inert electrode assembly having a mechanical connection and an electrical connection;

providing an electrically conductive support structure assembly having a mechanical connection and an electrical connection;

coupling said electrode assembly to said support structure assembly so that said mechanical connection holds said electrical connection in compression.