| 摘要 |
PROBLEM TO BE SOLVED: To inhibit the flowage of brazing material in brazing. SOLUTION: This heat exchanger does not have a brazing material layer on an inner surface of a tube 5, but has brazing material layers 49b, 49c on both faces of an inner fin 49, and the tube 5 and the inner fin 49 are joined. The inner fin 49 is brazed and joined to an inner peripheral face of the tube 5 so that it is not kept into contact with both joint parts 47, 47. Whereby a brazing material flowage cut-off part S dividing the brazing material in the tube 5 (brazing material layers 49b, 49c of both faces of inner fin 49) and the brazing material outside of the tube 5 (brazing material layer 5c of outer surface of tube 5), is formed near joint parts 47, 47 of the inner surface of the tube 5. The brazing material flowage cut-off part S divides the flowage of the brazing material in the tube 5 and the flowage of the brazing material outside of the tube in brazing, and prevents flow-out of the brazing material from the inside of the tube 5 to the outside of the tube 5 and flow-out of the brazing material from the outside of the tube 5 into the tube, through the joined faces of the joint parts 47, 47. As a result, the flow-out of the brazing material to the outside of the tube 5 and the flow-out of the brazing material from the outside of the tube 5 into the tube 5 can be prevented. COPYRIGHT: (C)2005,JPO&NCIPI
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