Exhaust hood apparatus

F - Mech Eng,Light,Heat,Weapons – 24 – C

Patent

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Details

F24C 15/20 (2006.01) A62C 3/04 (2006.01)

Patent

CA 2169702

An exhaust hood apparatus, adapted to be mounted over a cooking station for expelling air containing cooking by-products, is described herein. The exhaust hood apparatus includes a controller circuit electrically connected to at least a temperature sensor, an exhaust fan and a plenum chamber washing system. The controller circuit is configured so as to energize the exhaust fan and the washing system if the temperature sensor detects a temperature that is above a predetermined threshold, indicating an uncontrolled fire in progress. A portion of the water exiting the washing system is therefore drawn in the exhaust duct by the exhaust fan to thereby cool the exhaust duct and maintain it below a predetermined safety temperature. Furthermore, the exhaust fan also draws at least some of the smoke generated by the uncontrolled fire.

Hotte se montant au-dessus d'une cuisinière pour évacuer l'air contenant les sous-produits de la cuisson. La hotte comporte un circuit de commande relié au moins à un senseur thermique, à un ventilateur et à un système de lavage du plénum. Le circuit de commande est configuré de manière à alimenter le ventilateur et le système de lavage lorsque le senseur thermique enregistre une température dépassant un seuil prédéterminé, ce qui indique l'existence d'un feu hors de contrôle. Une partie de l'eau sortant du système de lavage est donc aspirée dans le conduit d'évacuation par le ventilateur pour refroidir le conduit d'évacuation et maintenir la température dudit conduit à un niveau inférieur au niveau de sécurité prédéterminé. De plus, le ventilateur aspire au moins une partie de la fumée due au feu non contrôlé.

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