Modular heat exchanger and method of making

F - Mech Eng,Light,Heat,Weapons – 28 – D

Patent

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F28D 1/02 (2006.01) F28F 1/26 (2006.01) F28F 3/04 (2006.01)

Patent

CA 2305508

A modular heat exchanger (10) includes a plurality of tubular modules (61) formed from an aluminum extrusion. Each extruded tube (62) has a generally rectangular cross section, a through bore (66) extending longitudinally therethrough between parallel opposite faces (63), and parallel longitudinal V-grooves (64) in the faces (63), all formed in the extrusion process. Each face (63) includes a plurality of parallel fins (69) which are cut into the grooved face (63) in a direction transverse to the grooves (64). The fins (69) have a generally saw tooth structure so as to increase the turbulence of the air flow through the heat exchanger (10). Unslotted end faces (68) on the tubes (62) include groove portions (71) which are filled with weld material in both the tube joining process and the end tank welding process, thereby providing an all-welded aluminum heat exchanger of substantially enhanced strength.

L'invention porte sur un échangeur (10) modulaire consistant en une série de modules (61) tubulaires formés par extrusion d'un profilé d'aluminium. Chacun des tubes (62) extrudés présente une section transversale sensiblement rectangulaire, un alésage (66) traversant s'étendant longitudinalement entre deux faces (63) parallèles opposées, et des rainures (64) longitudinales parallèles en V, tous formés lors du processus d'extrusion, chacune des faces comportant une série d'ailettes (69) parallèles découpées dans la face (63) rainurée perpendiculairement aux rainures (64). Lesdites ailettes (69) ont une structure sensiblement en dents de scie accroissant les turbulences des flux d'air traversant l'échangeur (10). Les faces (68) d'extrémité non fendues des tubes (62) comportent des parties (71) rainurées remplies d'un matériau de brasage lors des phases de raccordement des tubes et de soudure du réservoir final. On obtient ainsi un échangeur entièrement en aluminium soudé de résistance sensiblement renforcée. Dans une variante, entièrement soudée, les faces d'extrémité allongées non fendues sont l'objet de percements croisés et sont obturées pour assurer une alimentation en liquide à la place des réservoirs d'extrémité.

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