Method and apparatus for effecting convective heat transfer...

C - Chemistry – Metallurgy – 21 – D

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C21D 1/00 (2006.01) C21D 1/767 (2006.01) F27B 5/16 (2006.01) F27B 17/00 (2006.01) F27D 1/00 (2006.01)

Patent

CA 2015978

A low-cost, improved convective heat transfer furnace is disclosed which includes a cylindrical casing to which is attached blanket insulation and the casing is closed at its ends to define a closed end cylindrical furnace enclosure. An annular fan face plate is positioned within the enclosure to define a pressure zone on one side and a work zone on the other side. A paddle wheel fan in the work zone develops a large mass of circumferentially swirling wind which is initially formed as a stationary swirling mass without an axial force component but which under pressure travels axially in the form of a swirling annulus through the non-orificing annular space. The under pressure zone established by the central opening in the fan face plate causes the swirling wind annulus in the work zone to expand radially inwardly and uniformly impinge the complete surface of the work in an effective heat transfer manner before being recirculated back to the pressure zone.

Four à transfert de chaleur par convection amélioré et à prix modique comportant un boîtier cylindrique entouré d'un matelas isolant; le boîtier est fermé à ses extrémités de manière à définir un boîtier de four cylindrique à extrémités fermées. Une plaque circulaire comportant un ventilateur est placée à l'intérieur du boîtier de manière à définir une zone de pressurisation d'un côté et une zone de cuisson de l'autre. Un ventilateur à aubes radiales situé dans la zone de cuisson fournit une importante masse d'air tourbillonnant en périphérie constituée initialement d'une masse d'air statique sans force axiale mais qui, pressurisée, se déplace axialement et traverse l'espace annulaire. La zone pressurisée établie par l'ouverture centrale de la plaque du ventilateur provoque la dilatation de l'anneau d'air tourbillonnant situé dans la zone de cuisson dans le sens radial et vers l'intérieur, et cet air baigne uniformément toute la surface de cuisson de la pièce en transférant efficacement la chaleur avant de retourner à la zone de pressurisation.

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