Improved heat transfer tube with grooved inner surface

Details Improved heat transfer tube with grooved inner surface Improved heat transfer tube with grooved inner surface

F - Mech Eng,Light,Heat,Weapons

28

F

F28F 1/40 (2006.01)

Patent

CA 2444553

The inner surface of the tube (10) has a primary set of fins (12)and an intermediate sets of fins (26) positioned in the areas (24) between the primary fins (12) and at an angle relative to the primary fins (12). In a preferred embodiment of the inner surface tube design, the intermediate fins (26) are positioned relative to the primary fins (12) to result in a grid-like appearance. A first set of rollers creates the primary (12) and intermediate fin (26) designs on at least one side of a board. A second set of rollers may be used to further enhance the performance. After the desired pattern has been transferred onto the board with the rollers, the board is then formed and welded into a tube, so that, at a minimum, the inner surface design of the resulting tube includes the intermediate fins as contemplated by the present invention.

L'invention concerne une surface interne d'un tube (10), présentant un ensemble principal d'ailettes (12) et un ensemble intermédiaire d'ailettes (26) qui est situé dans des zones (24) comprises entre les ailettes principales (12) et à un angle relatif aux ailettes principales. Dans un mode de conception privilégié du tube à surface interne, les ailettes intermédiaires (26) sont placées par rapport aux ailettes principales (12) de manière à obtenir une configuration de type grille. Un premier ensemble de rouleaux permet de former les ailettes primaires (12) et les ailettes secondaires (26) sur au moins un côté d'un panneau. Un second ensemble de rouleaux peut être utilisé pour améliorer encore le rendement. Une fois le motif souhaité transféré sur le panneau au moyen des rouleaux, ce panneau est ensuite façonné et soudé pour former un tube, de telle sorte qu'au moins la conception de la surface interne du tube ainsi obtenu comprenne les ailettes intermédiaires décrites dans cette invention.

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