FINNED TUBE FOR HEAT EXCHANGERS, HEAT EXCHANGER, APPARATUS FOR FABRICATING HEAT EXCHANGER FINNED TUBE AND PROCESS FOR FABRICATING HEAT EXCHANGER FINNED TUBE

摘要

PROBLEM TO BE SOLVED: To provide a heat exchanger tube with fins, capable of suppressing the leakage of a cooling medium, obtaining desired cooling performance, and preventing the tube from being burst during manufacture.;SOLUTION: Two tube insertion through-holes are formed in mutually spaced relation in the plurality of plate fins 14. Both straight tube portions 11a of a hair-pin shaped fin fixing tube 11 with no welding joint are inserted into the tube insertion through-holes, respectively. Thereby, a plurality of fin groups 12 each consisting of the plurality of parallel plate fins 14 are provided in mutually spaced relation in the longitudinal direction of the straight tube portions 11a. Fluid is used for enlarging the hair-pin shaped tube 11 and the plate fins 14 of each fin group 12 are fixed around the straight tube portions 11a of the fin fixing tube 11. Non-fin areas 13 are provided between two adjacent fin groups 12 on both straight tube portions 11a of the fin fixing tube 11. A clamp marked portion 19 exists on the outer peripheral face of the non-fin area 19 on each straight tube portion 11a.;COPYRIGHT: (C)2004,JPO&NCIPI