METHOD OF MANUFACTURING HEAT EXCHANGER CORE AND ASSEMBLY THEREFOR

摘要

Prior art exchanger cores (10) have been expensive to produce and have too often had poorly heat conductive joining of the liquid circulating tubes (12) to the cooling fins (14). Herein, the tube (12) is fitted into holes (28) in the fins (14) with a small gap (42 or 44) between a portion (20, 22) of the tube (12) and the hole (28). Solder sources (38) e.g., sheets (38) having holes (40) therethrough which generally match the holes (28) in the fins (14), are positioned between some of the fins (14) with the tubes (12) fitting in the holes (40) in the solder sheets (38). The entire assembly (50) is heated with the tubes (12) being held generally vertically. As the solder sheets (38) melt, solder flows through the gap (42 or 44) wetting not only the fin (14) above which it sits, but also lower fins (14). Capillary action leads to solder wetting the entire junction between each fin (14) and each tube (12). Good solder joints having excellent heat conducting properties are produced.