| 摘要 |
<p>A heat exchanger (1) formed by laminating tube elements (2) in parallel manner with fins (3) therebetween, the tube elements being formed by folding a single plate or by overlapping two plates and formed integral therein with beads (21), which compartment an interior of the tube element into a plurality of flow passages (24), an intermediate portion of the tube elements having a greater thickness (b) before such lamination than a thickness (a) of an intermediate portion on a tube surface of the tube elements after such lamination. A method of manufacturing a heat exchanger, according to the invention, comprises beforehand forming an intermediate portion of the tube elements (2) prior to lamination into a configuration, in which it expands toward the fins, then laminating these tube elements one upon another with the fins therebetween to compress the tube elements to form an assembly of a heat exchanger, applying flux on the assembly, and feeding the assembly into a furnace to subject it to integral brazing by heat treatment. Accordingly, the expanded portion is suitably compressed by pressure welding of the fins at the time of lamination of the tube elements such that top portions of the tube elements or the beads and inner wall portions of the tube elements are corrected to permit brazing. <IMAGE></p> |
