HEAT EXCHANGER

PURPOSE:To improve heat transfer efficiency and reduce the volume by winding alternately two pairs of thin plates and reticular sheets on a cylinder surface in multi-layers and bonding airtightly thin plates together at the beginning and the end of the plate in order to secure a plurality of pairs of spiral cross-sectional flow channels. CONSTITUTION:Thin plates A31 and B32, and a reticular sheets A41 and B42 are alternately spirally wound around a cylinder and they are bonded with a brazing material, etc. At a header section 1 a reticular mask section 5 is wound and solidified in one body with a soldering material, etc. In two kinds of fluids between which heat is exchanged, one enters the upper end of an inlet and outlet opening A61 and flows through the reticular sheet B42 and flows out from the upper end of the inlet and outlet opening B62. Each of the flow passages is divided by the thin plates A31 and B32, so that there is no chance that fluids get mixed together. It is possible to miniaturize the heat exchanger and improve its efficiency because the partition of the flow passage is very thin and each flow channel is divided into small channels and the distance between the flow channels can be made thereby small.