TORSION PIPE TYPE HEAT EXCHANGER AND MANUFACTURING METHOD OF TORSION PIPE TYPE HEAT EXCHANGER

摘要

PROBLEM TO BE SOLVED: To provide a torsion type heat exchanger capable of preventing corrosion of a connection part of a water piping due to brazing.SOLUTION: A torsion type heat exchanger 1 includes: a water piping 3 in which a plurality of lines of crest and trough bottom parts on the outer periphery thereof are continuously provided into a spiral shape for each line, and that is made of phosphorous-deoxidized copper; a coolant piping 5 that is spirally wound along the shape of the crest and trough bottom part of the outer periphery of the water piping 3 for fixation; and a joint piping 4 that is connected to the end part of the water piping 3 and made of phosphorous-deoxidized copper. The connection part of the water piping 3 and the joint piping 4 contains is subjected to brazing by using a brazing material 2 of phosphorous copper wax containing tin of 4.0-8.0 wt.% and phosphorus of 6.8-8.0 wt.%, and not containing silver.