Title:
MULTIVOID HEAT EXCHANGER TUBING WITH ULTRA SMALL VOIDS AND METHOD FOR MAKING THE TUBING
Document Type and Number:
WIPO Patent Application WO2002046678
Kind Code:
A3
Abstract:
This invention is a process for making micro-multiport tubing (10) for use in heat exchangers. The tubing (10) is a flat body (18) with a row of side-by-side passageways (20), which are separated by upright webs (22). Processing of this tubing (10) involves extrusion, a straightening and cutting operation, a rolling step to reduce the thickness of the flat body (18) and to obtain ultra small voids, assembly and furnace brazing of the heat exchanger. This invention improves the grain size of the metal in the tubing (10) and also improves the metallurgical strength of the tubing (10). There is at least 10 percent change in material thickness. The strain is concentrated at the center of the web (22) and results in at least enough cold work to produce fine recrystallized grains during the brazing thermal cycle. The amount of grain growth is controlled and the improvement in the metallurgical strength is achieved.
Inventors:
KRAFT FRANK F (US)
Application Number:
PCT/US2001/046601
Publication Date:
February 13, 2003
Filing Date:
December 05, 2001
Export Citation:
Assignee:
BRAZEWAY INC (US)
KRAFT FRANK F (US)
KRAFT FRANK F (US)
International Classes:
F28D1/053; F28F1/02; (IPC1-7): F28D1/053; F28F1/02
Foreign References:
| EP0990828A2 | 2000-04-05 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 016, no. 051 (M - 1209) 10 February 1992 (1992-02-10)
PATENT ABSTRACTS OF JAPAN vol. 008, no. 230 (M - 333) 23 October 1984 (1984-10-23)
PATENT ABSTRACTS OF JAPAN vol. 014, no. 277 (M - 0985) 15 June 1990 (1990-06-15)
PATENT ABSTRACTS OF JAPAN vol. 008, no. 230 (M - 333) 23 October 1984 (1984-10-23)
PATENT ABSTRACTS OF JAPAN vol. 014, no. 277 (M - 0985) 15 June 1990 (1990-06-15)
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