Patent ID: 6640886
Filing Date: 2003-11-04
Classification: B21C,F28D,F28F,Y10T

Abstract:
In a flattened tube for use in a heat exchanger having two spaced relatively long side walls connected at their ends by two spaced relatively short end walls to provide a generally rectangular or oval-like cross section and an internal fin extending between the side walls within the tube to provide a plurality of internal flow channels within the tube, the improvement wherein the tube includes two pieces, each including a corresponding one of said side walls and at least one of said pieces including at least a portion of each of said end walls with a first of said pieces including an integral corrugated section defining said internal fin and folded back into abutment with the side wall of a second said piece having its side wall abutting said corrugated section opposite of the side wall of said first piece; said pieces being sealingly bonded to each other at said end walls with the side walls of both said pieces being bonded to said corrugated section within said cross section.