| 摘要 |
PURPOSE:To make the manufacture of a heat exchanger easy and increase its endurance by forming a collar having a ring groove to a header plate of a solderless heat exchanger for a car radiator or the like and connecting a tube to this collar by widening a diameter thereof. CONSTITUTION:A header plate 5 is placed on each end of a laminated body of plate fins 2. A tube 1 is inserted into holes 2a and 5a of the plate fin 2 and the heat plate 5 and then the tube 1 is widened at its diameter with a jig and fixed to the inner surface of the collars 2a and 5a of the fin 2 and the header plate 5 with pressure. Since U type ring groove 5b is mounted around the outer circumference of the collar 5a, a stress caused by an elastic transformation of the groove 5b acts on a combined surface A of the collar portion 5a with the tube 1, whereby a large surface pressure acts on the whole combined surface and a close and strong contact is obtained. Further, a mechanical load from outside can be absorbed by the transformation of the groove 5b, and therefore the endurance increases. |
