Hood-type annealing furnace

C - Chemistry – Metallurgy – 21 – D

Patent

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Details

C21D 9/54 (2006.01)

Patent

CA 2169125

A hood-type annealing furnace comprises an annealing base (1) for supporting the annealing goods (2) and a protective hood (3) tightly placed onto the annealing base (1). Inside the annealing base (1) there is provided a fan including a central impeller (4) and a distributor (5) surrounding the same. To achieve a quicker cooling after the heat treatment, a sealable annular gap (7) is disposed between the impeller (4) and the distributor (5), behind which annular gap a heat exchanger (8) is provided, from which the partial quantity of protective gas branched off into the annular gap (7) can flow back into the protective hood (3).

Un four de recuit à cloche comportant une base de recuit (1) pour recevoir les produits à recuire (2) et une cloche de protection (3) en contact hermétique avec la base de recuit (1). l'intérieur de la base de recuit (1) est logé un ventilateur avec roue à ailettes centrale (4) entourée d'un diffuseur (5). Pour obtenir un refroidissement plus rapide après le traitement de recuit, un espace annulaire réglable (7) est aménagé entre la roue à ailettes (4) et le diffuseur (5); derrière l'espace annulaire se trouve un échangeur de chaleur (8), d'où la portion de gaz protecteur dérivé par l'espace annulaire (7) peut refluer vers l'intérieur de la cloche de protection (3).

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