Slotted tubes for heat exchangers with improved resistance to expansion.

摘要

metal tube (1) slotted thickness Tf groove bottom and outer diameter typically intended for the manufacture of heat exchangers or batteries (4) using a fluid frigoportador or caloportador mono-phase or two-phase, said tube being (1) grooved interiorly by N helicoidal ribs, going N of 20 to 80 according to the outside diameter of angle α apex height H in a radial direction (11) of said tube, of base B of width LN and angle β helix, two typically flat consecutive ribs separated by a slot (3) bottom (30) of width LR being, with a pitch P equal to LR + LN, characterized in that: a) said widths LN and LR are such that LN / LR is between 0.40 ratio to 0.80, b) said N ribs having a FWHM LN1 / 2 that is at least equal to 2.LN / 3 c) said N ribs are oblique ribs (2), inclined, typically in the same direction , A γ angle with respect to said radial direction (11) ranging from 10 ° to 35 °, said angle γ the angle formed between said radial direction (11) and a median line (24) passing through the center of said base B (20) of said rib (2) and the center of the width of the rib (2) taken to their average height H / 2, and within which said rib (2) is a rib (2) having a tetragonal section comprising, in addition to its base B (20), an apical side S (21) opposite said base B (20) and two lateral sides CL1 (22) and CL2 (23) forming between them said angle α vertex, of which one CL1 (22) forms a θ1 angle less than 90 ° with said groove (30) adjacent, and of which the other CL2 (23) forms a θ2 angle typically greater than 90 ° with said bottom slot (30) adjacent said apex angle going from 10 to 35 °, so that it said tube has a high crush strength, high capacities d and heat exchange and a low pressure loss when said tube is integral with cooling fins on a battery.