Patent ID: 7181929
Filing Date: 2007-02-27
Classification: F25B,F28D,F28F

Abstract:
1. A heat exchanger finned tube which has a fin fixing tube having a straight tube portion and comprising a tube having no weld seam, and a fin group comprising a plurality of parallel plate fins fixed to the straight tube portion of the fin fixing tube, the straight tube portion having at least one finless part provided with no fin group, each of the plate fin having a tube inserting hole, the fin fixing tube having its straight tube portion inserted through the holes of the plate fins and being enlarged with use of a fluid to thereby fixedly fit the plate fins around the straight tube portion, the finless part of the straight tube portion having an outer peripheral surface bearing annular clamp marks left by clamping the straight tube portion over the entire circumference thereof when the fin fixing tube is enlarged.