Patent ID: 8353335
Filing Date: 2013-01-15
Classification: F28F

Abstract:
1. A flat tube for heat exchangers, the flat tube comprising: first and second narrow sides and first and second broad sides manufactured from two continuous strips of material, each strip having a relatively large curve on one longitudinal edge of the strip, and having a relatively small curve on another longitudinal edge of the strip; wherein the two strips are arranged with respect to one another in order to form a wall of the flat tube in such a way that the relatively large curve of a longitudinal edge of one strip holds in itself the relatively small curve of a longitudinal edge of the other strip in order to form each of the first and second narrow sides of the flat tube; wherein the large curve has a start and an end and the small curve has a start and an end; and wherein each of the two strips includes a first contoured portion extending into an interior of the tube, and a second contoured portion formed along an exterior of the flat tube, the first contoured portion of one of the strips engaging the end of the small curve of an other of the strips and a second contoured portion of the one of the strips engaging the end of the large curve of the other of the strips.