BRAZED JOINT BETWEEN A COOLING FLUID BOX AND AN ARMATURE BAR

• US 20110194891A1
• Filed: 02/08/2010
• Published: 08/11/2011
• Est. Priority Date: 02/08/2010
• Status: Active Grant

• Current Assignee: Michael Bresney
• Original Assignee: Michael Bresney
• Inventors: Bresney, Michael
• Granted Patent: US 8,129,876 B2
• Time in Patent Office: Days
• US Class Current: 403/272
• CPC Class Codes: B23K 1/0012 Brazing heat exchangers
• CPC Class Codes: B23K 37/047 moving work to adjust its position between soldering, welding or cutting steps B23K37/053 takes precedence
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

A brazed joint between a cooling fluid box and an armature bar can comprise a cooling fluid box, a plurality of conductor strands, at least one side wall spacer, and at least one middle spacer. Each side wall spacer can have a tapered width and can be wedged between the plurality of conductor strands and an interior side wall of the cooling fluid box. Each middle spacer can have a tapered width and can be wedged between two columns of the conductor strands. The side wall spacers can taper in a direction opposite the taper of the middle spacers. In one embodiment, the cooling fluid box can move around the conductor strands. Each side wall spacer can be positioned against an interior surface of the cooling fluid box. Each middle spacer can be positioned between columns of conductor strands. The cooling fluid box can be withdrawn to a final position.

Claims

1. A brazed joint between an armature bar and a cooling fluid box, the joint comprising:

a cooling fluid box with an inboard end, an opposing outboard end, a first side wall, and a second side wall, the first side wall opposing the second side wall;

a plurality of conductor strands extending into the inboard end of the cooling fluid box, wherein the plurality of conductor strands are arranged in a plurality of columns;

at least one side wall spacer wedged between the plurality of conductor strands and at least one of the first side wall and the second side wall, wherein the at least one side wall spacer has a first tapered width that tapers in a direction from the inboard end of the cooling fluid box toward the outboard end of the cooling fluid box; and

at least one middle spacer wedged between at least a first column of the plurality of conductor strands and a second column of the plurality of conductor strands, wherein the at least one middle spacer has a second tapered width that tapers in a direction from the outboard end of the cooling fluid box toward the inboard end of the cooling fluid box.

2. The brazed joint of claim 1, wherein at least one from the plurality of conductor strands is hollow.

3. The brazed joint of claim 1, wherein at least one from the plurality of conductor strands is solid.

4. The brazed joint of claim 1, wherein the at least one side wall spacer has at least one protrusion along at least a portion of an edge, wherein the at least one protrusion interacts with a second protrusion on at least one of the first side wall and the second side wall to inhibit movement in a direction toward at least one of the inboard end and the outboard end.

5. The brazed joint of claim 1, wherein at least one from the group consisting of the at least one side wall spacer and the at least one middle spacer is serrated on at least one surface to reduce void spaces.

6. The brazed joint of claim 1, wherein a braze alloy fills a substantial portion of the void spaces between the conductor strands in the plurality of conductor strands, between the plurality of conductor strands and the at least one middle spacer, between the plurality of conductor strands and the at least one side wall spacer, between the at least one side wall spacer and the cooling fluid box, and between the plurality of conductor strands and the cooling fluid box, in order to seal the joint and make it impervious to cooling fluid penetration or leaks.

7. The brazed joint of claim 1, wherein a summation of the amount the first tapered width of all the side wall spacers taper approximately equals a summation of the amount the second tapered widths of all the middle spacers taper.

8. The brazed joint of claim 1, wherein a first taper angle characterizes each first tapered width, a second taper angle characterizes each second tapered width, and a summation of the first taper angles of all the side wall spacers equals a summation of the second taper angles of all the middle spacers, in order to reduce a deviation of each of the conductor strands in the plurality of conductor strands from parallel with each of the other conductor strands in the plurality of conductor strands.

9. The brazed joint of claim 1, wherein the at least one middle spacer comprises at least one and at most two central middle spacers, and a plurality of peripheral middle spacers, with an equal number of peripheral middle spacers from the plurality of peripheral middle spacers on two opposing sides of the at least one and at most two central middle spacers, the first tapered width of each side wall spacer tapering at a greater angle than the second tapered width of each peripheral middle spacer and the second tapered width of each of the at least one and at most two central middle spacers, and the second tapered width of each peripheral middle spacer tapering at a greater angle than the second tapered width of each of the at least one and at most two central middle spacers.

10. A method of forming a brazed joint between an armature bar and a cooling fluid box, the method comprising the steps:

moving the cooling fluid box, with respect to a plurality of conductor strands, around the plurality of conductor strands, so the plurality of conductor strands enters through a first end of the cooling fluid box;

positioning at least one tapered side wall spacer against at least one interior surface of the cooling fluid box;

positioning at least one tapered middle spacer between at least two conductor strands from the plurality of conductor strands;

withdrawing the cooling fluid box and the at least one tapered side wall spacer, with respect to the plurality of conductor strands, to a final position at which the plurality of conductor strands, the at least one middle spacer, and the at least one side wall spacer are wedged between the at least one interior surface and at least one opposing interior surface of the cooling fluid box opposite the at least one interior surface.

11. The method of claim 10, comprising the further step of brazing the plurality of conductor strands, the at least one middle spacer, and the at least one side wall spacer to the cooling fluid box to obtain a more permanent and fluid-impermeable joint.

12. The method of claim 10, wherein at least one conductor strand from the plurality of conductor strands is hollow.

13. The method of claim 10, wherein at least one conductor strand from the plurality of conductor strands is solid.

14. The method of claim 10, wherein the at least one tapered side wall spacer has at least one lip protruding along at least a portion of an edge, wherein the at least one lip contacts a protrusion on the at least one interior surface of the cooling fluid box to inhibit movement of the at least one tapered side wall spacer out of position.

15. The method of claim 10, wherein the step of moving the cooling fluid box around the plurality of conductor strands further comprises moving the cooling fluid box with respect to the plurality of conductor strands so the plurality of conductor strands exits the cooling fluid box through an opposing end of the cooling fluid box.

16. The method of claim 10, wherein the at least one tapered middle spacer tapers in a direction generally opposite the direction the at least one tapered side wall spacer tapers.

17. The method of claim 10, wherein withdrawing the cooling fluid box is accomplished by positioning an alignment apparatus on the plurality of conductor strands and pulling the cooling fluid box so the at least one tapered side spacer moves toward the at least one tapered middle spacer.

18. The method of claim 17, wherein the alignment apparatus comprises a block with a drilled hole, and at least one projection, each projection spaced to align with each of the at least one middle spacers.

19. The method of claim 10, wherein at the final position, gap distances between the at least one tapered middle spacer and each adjacent conductor strand, gap distances between the at least one tapered side wall spacer and each adjacent conductor strand, and gap distances between the at least one tapered side wall spacer and the at least one interior surface of the cooling fluid box, are smaller than 0.003 inches (0.0076 centimeters).

20. The method of claim 10, wherein at the final position, gap distances between the at least one middle spacer and the cooling fluid box, gap distances between the cooling fluid box and each adjacent conductor strand, and gap distances between the at least one side wall spacer and the cooling fluid box, are smaller than 0.003 inches (0.0076 centimeters).