Patent ID: 6378204
Filing Date: 2002-04-30
Classification: B21D,F25B,F25D,F28D,F28F,Y10T

Abstract:
A method for manufacturing a heat exchanger comprising the steps of:preparing fins having respective first and second through-holes through which respective first and second pipes are inserted; arranging the fins depth-wise in parallel with each other and depth-wise in several separated groups; inserting the first and second pipes through the respective first and second through-holes of the fins of the fin groups such that respective first and second inner pipe portions of the first and second pipes are disposed in the fin groups and respective first and second outer pipe portions of the first and second pipes are located between the fin groups; bending the outer pipe portions of the pipes so that the fin groups separated from each other thereby are piled in layers along a longitudinal direction of air flow and the first and second inner pipe portions of the pipes are arranged in respective first and second pipe rows which are coplanar along the longitudinal direction of air flow; and wrenching the bent outer portions of the pipes to form each pipe row into a zigzag shape.