Patent ID: 6810951
Filing Date: 2004-11-02
Classification: F28D,F28F

Abstract:
Flat tube (1) for the circulation of a fluid in a heat exchanger, especially a radiator for cooling the engine powering a motor vehicle, formed by a strip of sheet metal folded so as to define a peripheral wall (10-12) separating the interior of the tube from the exterior and an intermediate spacer (9, 9) mechanically reinforcing the tube and dividing the interior thereof into two longitudinal flow channels (16) which are open at at least one first end of the tube, the mechanical connection between the peripheral wall and the spacer being provided partly by the continuation of the material of the strip forming the peripheral wall and partly by brazing, the tube including a body (1) which features a substantially constant elongate cross section and at least one head region (3, 4) extending between said body and said at least one first end, wherein said peripheral wall, but not the spacer, is deformed in such a way as to dilate the channels in the direction of the width of said cross section and to shrink them again towards the spacer in the direction of the length of the cross section,wherein the spacer is formed by two marginal zones (9, 9) of said strip, brazed mutually face-to-face continuously along their entire length, the opposite edge faces (13, 13) of the strip, adjacent respectively to these two zones, coming opposite the inner face of the peripheral wall (10) to which they are brazed.