Hot-air circulation furnace

F - Mech Eng,Light,Heat,Weapons – 27 – B

Patent

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Details

F27B 9/16 (2006.01)

Patent

CA 2548786

A hot-air circulation furnace for heating a heating-target to a predetermined temperature by circulating hot air in the furnace, which is capable of performing continuous treatment while the size is small, or forming a heating zone and a soaking zone while using hot air at a fixed temperature. In the interior of the furnace which is divided into an outer peripheral region (6) and an inner region (7) by an annular partition (8) and paths (9) and (10) in the vicinities of a floor and a roof respectively, hot air supplied from a heat source (5) is blown out from an axial-flow fan (11) toward a hearth (2) in the inner region (7) to form a circulating flow passing through an annular heating-target mount (23) on the rotating hearth (2) installed in the outer peripheral region (6). The heating-targets are taken out one by one after increasing the temperature of the heating-target on the mount (23) to be a predetermined point during one rotation of the hearth (2). Further, a partition (12) whose outlet-side opening 02 is narrower than the inlet-side opening .theta.1 is provided inside the annular partition (8) to supply part of high-temperature gas blown out from the axial-flow fan (11) to the heating-target mount (23) while increasing the velocity of the gas.

Ce four à circulation d'air chaud permet de chauffer un objet à une température donnée en faisant circuler l'air chaud dans le four. Malgré sa taille réduite, le four permet un traitement en continu et peut intégrer une zone de chauffage et une zone de trempage en utilisant les flux d'air chaud à la même température. Le four est divisé en une zone latérale périphérique externe (6) et une zone interne (7) par une partition annulaire (8), un sol et des passages (9, 10) proches du plafond. L'air chaud apporté par une source de chaleur (5) est expulsé par un ventilateur à flux axial (11) vers un foyer (2), dans la zone interne (7). Ce phénomène forme dans le four un flux de circulation faisant passer une table de placement de l'objet à chauffer (23) en forme annulaire, sur le foyer rotatif (2) placé dans la zone latérale périphérique externe (6) ; et, tandis que le foyer (2) effectue une rotation, la température des objets à chauffer sur la table (23) augmente jusqu'à atteindre un niveau prédéterminé avant extraction à l'extérieur du four. En outre, un compartiment (12) dont l'ouverture sur le côté de sortie ?<sub

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