Method and device for installing a header cap on a water header of a stator coil

• US 5,528,827 A
• Filed: 04/27/1995
• Issued: 06/25/1996
• Est. Priority Date: 05/09/1994
• Status: Expired due to Term

• Current Assignee: Siemens Energy Incorporated (Siemens AG)
• Original Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Inventors: Dailey, George F., O'Leary, Michael T.
• Primary Examiner(s): Cuda, Irene
• Application Number:
  US08/431,598
• Time in Patent Office: 425 Days
• Field of Search: 29/890.052, 29/732, 29/890.03, 228/44.3, 228/212
• US Class Current: 29/890.052
• CPC Class Codes: B23K 20/023 Thermo-compression bonding
• CPC Class Codes: H02K 15/0093 Manufacturing or repairing cooling fluid boxes, i.e. terminals of fluid cooled windings ensuring both electrical and fluid connection
• CPC Class Codes: H02K 3/505 for large machine windings, e.g. bar windings H02K3/51 takes precedence
• CPC Class Codes: Y10T 29/4935 Heat exchanger or boiler making
• CPC Class Codes: Y10T 29/49389 Header or manifold making
• CPC Class Codes: Y10T 29/53143 Motor or generator

Abstract

A method for installing a header cap on a water header both positioned on a stator coil. The method includes the steps of creating a generally smooth surface on the water header for providing a mating surface on the water header. A seal is interposed between the mating surface of the water header and the header cap for providing a material used to provide a sealed boundary between the cap and mating surface. The header cap and the mating surface of the water header are placed in abutting relationship with the seal for forming a layered, contiguous connection. A pressure device is attached in operative association with the header cap for operatively applying a pressure to the header cap. A spring which is received by the pressure device is compressed for applying a constant and unidirectional pressure to the pressure device which, in turn, transmits the constant and unidirectional pressure to the header cap. The connection is finally heated for brazing the header cap and water header together and for forming a seal.

Claims

1. A method for installing a header cap on a water header both positioned on a stator coil, comprising the steps of:

(a) creating a generally smooth surface on the water header for providing a mating surface on the water header;

(b) interposing a sealing means between the header cap and the mating surface of the water header for providing a material used to provide a sealed boundary between the cap and mating surface;

(c) placing the header cap and the mating surface of the water header both in abutting relationship with the sealing means for forming a layered, contiguous connection;

(d) attaching a pressure device in operative association with the header cap for operatively applying a pressure to the header cap;

(e) compressing a spring received by the pressure device for applying a constant and unidirectional pressure to the pressure device which, in turn, transmits the constant and unidirectional pressure to the header cap; and

(f) heating the connection for brazing the header cap and water header together and for forming a seal.

2. The method as in claim 1, wherein said installing step includes adjusting the spring for adjusting the generally constant and unidirectional clamping force.

3. The method as in claim 2 further comprising clamping a cooling block adjacent the connection for preventing damage to the stator coil.

4. The method as in claim 3, wherein said clamping step includes pumping water through the block for providing cooling of the block.