Method for electrically and hydraulically connecting a water-cooled conductor

• US 4,066,203 A
• Filed: 01/21/1977
• Issued: 01/03/1978
• Est. Priority Date: 01/21/1977
• Status: Expired due to Term

• Current Assignee: Cooper Services
• Original Assignee: Mcgraw-Edison Company (Eaton Corporation PLC.)
• Inventors: Davies, David Peter
• Primary Examiner(s): Kelly, Donald G.
• Application Number:
  US05/761,446
• Time in Patent Office: 347 Days
• Field of Search: 228/178, 228/179, 228/180 R, 228/132, 228/133, 228/212, 228/245, 228/246, 228/249, 310/52-54, 310/59
• US Class Current: 228/180.1
• CPC Class Codes: B23K 1/0012 Brazing heat exchangers
• CPC Class Codes: H02K 3/22 consisting of hollow conductors
• CPC Class Codes: H02K 3/505 for large machine windings, e.g. bar windings H02K3/51 takes precedence

Abstract

A method of electrically and hydraulically connecting a conductor bar having a plurality of hollow water-cooled conductors involves compressing the conductor bar and shims of brazing material in a connector clip formed of a pair of mating clip members. Brazing shims (strips and bands) are placed in desired positions, and then the components are heated and hydraulically compressed. The conductor bar and brazing material assembly is sized for a tight fit in one dimension, but oversized in another dimension so that compression results in a desired distribution of the molten brazing material. During compression, the clip members are secured from relative motion, other than displacement toward one another, and air is passed through the hollow conductors to prevent the accumulation of brazing material in the open ends thereof. In addition to the clip members, the connector device includes a water inlet member with a stem that is inserted between and brazed to the clip members after the compression step.

Claims

1. A method of forming an electrical and hydraulic connection for a conductor bar having a plurality of hollow water-cooled conductors comprising the steps:

producing mating connector clip members that form a conductor bar receiving chamber and a larger water cavity therebetween when placed together;

inserting strips of brazing material between adjacent hollow conductors in the conductor bar;

adjusting the cross-sectional length of the conductor bar to fit snuggly in conductor bar receiving chamber portions of said clip members;

placing a band of brazing material in said conductor bar receiving chamber portions of each of said clip members, said bands of brazing material being sufficiently thick to insure that the cross-sectional width of the conductor bar added to the thickness of said bands is greater than the width of said conductor bar receiving chamber;

locating the conductor bar between said clip members in said conductor bar receiving chamber portions thereof;

heating said clip members and the conductor bar to the melting temperature of said strips and bands of brazing material;

forcing said clip members together with the conductor bar therebetween until said clip members are brought into contact with one another; and

preventing brazing material from building up in the open ends of the hollow conductors of the conductor bar.

2. A method as claimed in claim 1 wherein said step of forcing said clip members together comprises hydraulically compressing the conductor bar and the strips and bands of brazing material between said clip members.

3. A method as claimed in claim 1 and further comprising the step of securing said clip members to prevent relative motion therebetween, while not interfering with displacement of said clip members toward one another, during said step of forcing said clip members together.

4. A method as claimed in claim 1 wherein said step of preventing brazing material from entering into the open ends of the hollow conductors of the conductor bar comprises:

extending the ends of said hollow conductors slightly beyond said conductor bar receiving chamber into said water cavity; and

passing air through the hollow conductors to blow out any brazing material that begins to flow into the open end of the hollow conductors.

5. A method as claimed in claim 1 wherein said step of adjusting the cross-sectional length of the conductor bar comprises placing a packing shim of conductive material having an appropriate thickness between a pair of hollow conductors.

6. A method as claimed in claim 1 wherein the hollow conductors are positioned in adjacent parallel rows separated by a web of conductive material and further comprising the step of placing additional bands of brazing material on either side of said web of conductive material, the thickness of said additional bands being added to the thickness of said bands of brazing material and the cross-sectional width of the conductor bar in determing a total dimension greater than the width of said conductor bar receiving chamber.

7. A method as claimed in claim 1 and further comprising the steps:

inserting a water inlet member into said water cavity after said clip members have been forced together; and

brazing said water inlet member to said clip members to thus provide for the insertion of water into said water cavity.

8. A method of forming an electrical and hydraulic connection for a conductor bar having a plurality of hollow water-cooled conductors arranged in two parallel rows separated by a web of conductive material comprising the steps:

producing mating connector clip members that form therebetween when placed together a conductor bar receiving chamber at one end and a larger water cavity at the other end;

inserting strips of brazing material between adjacent hollow conductors in the conductor bars;

placing a packing shim of an appropriate thickness in each of said rows of hollow conductors to adjust the cross-sectional length of the conductor bar in order to have it fit snuggly in said conductor bar receiving chamber;

placing a band of brazing material in a conductor bar receiving chamber portion in each of said clip members and on each side of said web of conductive material, said bands of brazing material being sufficiently thick to insure that the cross-sectional width of the conductor bar added to the thickness of said bands is greater than the width of said conductor bar receiving chamber;

locating the conductor bar between said clip members in said conductor bar receiving chamber portions thereof with the conductor bar extending partially into said water cavity;

passing a pair of dowels formed of conductive material through appropriate openings provided in said clip members to prevent relative motion between said clip members without interfering with displacement of said clip members toward one another;

heating said clip members and the conductor bar to the melting temperature of said strips and bands of brazing material;

hydraulically compressing the conductor bar and said strips and bands of brazing material between said clip members until said clip members are brought into contact with one another to braze the hollow conductors to one another and to said clip members and said web;

passing air through the hollow conductors to blow out any brazing material that begins to flow into the open ends of the hollow conductors;

inserting a water inlet member into said water cavity from the open end thereof, the inserted end of said water inlet member being spaced from the opposed end of said conductor bar; and

brazing said water inlet member to said clip members.