Fin-tube type heat exchanger

#1. Field of the Invention

#The present invention relates in general to a fin-tube type heat exchanger and, more particularly, to a structural improvement in such a fin-tube type heat exchanger not only for improving heat transfer rate between a fin body and air by forming dimples on the exterior surface of the fin body and but also for facilitating production of the fin-tube type heat exchanger.

#2. Description of the Prior Art

#The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

#FIG. 1 is a perspective view of an embodiment of a typical fin-tube type heat exchanger;

#FIG. 2 is a side view of the fin-tube type heat exchanger of FIG. 1;

#FIGS. 6A and 6B are side and plan views of a fin-tube type heat exchanger in accordance with a first embodiment of the present invention respectively. FIG. 7 is an enlarged view of the section C of the heat exchanger of FIG. 6A.

#As shown in the drawings, the general shape of the fin-tube type heat exchanger 60 of the first embodiment remains the same as described for the prior heat exchanger of FIGS. 2 and 3, but a plurality of dimples 13 instead of the typical louvered fins are provided on the surfaces of the fin bodies 11. In addition, the surfaces of the fin bodies 11 are provided with a plurality of separation bubble controllers 14 about the tubes 12 as shown in FIG. 7, which controllers 14 are adapted for reducing the size of separation bubbles formed about the tubes 12.

#In forming the dimples 13 on the surfaces of the fin bodies 11, it is preferred to let the relation between the height t.sub.h of each dimple 13 and the interval h between adjacent fin bodies 11 be defined by the inequality 0.01 h.ltoreq.t.sub.h .ltoreq.0.7 h. When letting the relation between the height of each dimple 13 and the interval between the adjacent fin bodies 11 as described above, the surface area of each fin body 11 will be increased and an appropriate interval between the dimples 13 of a tube body 11 and an adjacent tube body 11 will be kept.