A heat transfer tube and method of manufacturing same

Details A heat transfer tube and method of manufacturing same A heat transfer tube and method of manufacturing same

F - Mech Eng,Light,Heat,Weapons

28

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F28F 1/36 (2006.01) B21C 37/20 (2006.01) B21D 53/06 (2006.01) B26D 3/14 (2006.01) F28F 1/42 (2006.01) F28F 13/18 (2006.01) F28F 17/00 (2006.01)

Patent

CA 2230213

A heat transfer tube (10), and a method of manufacturing a heat transfer tube (10), having an external surface that is configured for enhanced heat transfer performance in both refrigerant evaporating and condensing applications. The tube is suitable for use in, for example, shell and tube type air conditioning condensers flooded evaporators, falling film evaporator, or a combination of flooded and falling film evaporator. The tube has at least one fin convolution (20) extending helically around its external surface (13). A pattern of notches (30) extends at an oblique angle (.alpha.) across the fin convolutions at intervals about the circumference of the tube. There is a split spike (22) having two distal tips (23) between each pair of adjacent notches. The fin convolution, notches and split spikes are formed in the tube by rolling the wall of the tube between a mandrel and, first, a gang of finning disks (63), second, a notching wheel (66) and third, a splitter wheel (67). Because of the interaction of the rotating and advancing tube and the notching wheel, during the manufacture of the tube, the maximum width (Wt) of the spike is greater than the width (Wr) of the proximal portion of the fin convolution.

Tube de transfert de chaleur (10) et méthode de fabrication de ce tube (10) qui comprend une surface externe configurée de façon à améliorer le rendement du transfert de chaleur pour des applications à la fois dans le domaine de la condensation et de l'évaporation du frigorigène. Par exemple, le tube trouve des applications dans des évaporateurs noyés de condenseurs de conditionneurs d'air de type à calandre ou à tube. Le tube a au moins une circonvolution (20) hélicoïdale à saillie autour de la surface externe (13). Une série d'encoches (30) s'étendent à angle oblique (.alpha.) en travers les circonvolutions, à intervalles, autour de la circonférence du tube. Une pointe fendue (22) comprenant deux extrémités distales (23) est placée entre chaque paire d'encoches adjacentes. La circonvolution à saillie, les encoches et les pointes fendues du tube sont obtenues en faisant rouler la paroi du tube entre un mandrin et, premièrement, un groupe de disques traceurs de saillies (63), deuxièmement une roue profileuse (66) et, troisièmement, une roue de séparation (67) des pointes. Étant donné l'interaction du processus de rotation et d'avancement du tube et de la roue profileuse, au cours de la préparation du tube, la largeur maximale (Wt) de la pointe est supérieure à la largeur (Wr) de la partie proximale de la circonvolution à saillie.

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