| 摘要 |
PROBLEM TO BE SOLVED: To improve heat exchanging performance by suppressing an air layer to reduce contact heat resistance by allowing paste brazing filler metal or diamond of nano-meter unit having graphite carbon with pure diamond as a nucleus, to enter micro uneven parts of the outer peripheral surface of a heat transfer tube and fin collars, and to suppress contact heat resistance to improve heat exchanging performance by generating electromotive force to the heat transfer tube using high frequency induction heating when inserting a tube enlarging tool into the heat transfer tube, and inserting the tube enlarging tool with a diameter larger than the inner diameter, into the inner surface of the heat transfer tube by eutectic melting, thereby causing a eutectic solidification phenomenon to carry out alloying pressure welding. SOLUTION: The paste brazing filler metal or liquid dispersedly containing diamond of nano-meter unit having graphite carbon with pure diamond as the nucleus, is applied thin to the outer peripheral surface of the heat transfer tube, and the heat transfer tube is inserted in metal fins having fin collars arranged at predetermined spaces to carry out tube enlarging pressure welding. COPYRIGHT: (C)2006,JPO&NCIPI |
