Microwire staple for holding the resistive member of a...

H - Electricity – 05 – B

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H05B 3/74 (2006.01)

Patent

CA 2271907

A heating unit (H) for a cook top includes a ribbon-type heating element (E). The heating element is mounted on the upper surface of a cake (I) of microporous insulation material. The heating element is arranged in a predetermined pattern on the material and a plurality of staples (10) are used to attach and hold the heating element on the material surface. Each staple is a microwire staple and the staples are spaced along the length of the heating element to mount the heating element to the insulation. The microwire staples have a small thermal mass and so do not create heat sinks at their locations of use. Thus, they do not affect the efficiency of heat transfer between the heating element and that which is being heated. The staples are also preferably of the same metal alloy as that from which the heating element is formed so the staples can withstand high temperatures and numerous temperature cycles to provide a long service life.

L'unité chauffante (H) de la partie supérieure d'un cuiseur comporte un élément chauffant (E) du type ruban. Cet élément est mis en place sur la face supérieure d'un aggloméré (I) de matériau isolant microporeux. Il est disposé sur le matériau selon une configuration prédéfinie et plusieurs agrafes (10) sont utilisées pour l'assujettir audit matériau et l'y maintenir en place. Ces agrafes, du type microfil, sont séparées les unes des autres et placées sur la longueur de l'élément chauffant, ce qui permet de monter ce dernier sur l'isolant. La masse thermique de ces agrafes microfils est réduite, ce qui évite la formation de puits de chaleur aux endroits où elles sont installées et, partant, ne compromet pas l'efficacité du transfert de chaleur entre l'élément chauffant et le produit chauffé. Ces agrafes sont faites, de préférence, du même alliage métallique que celui qui a été utilisé pour l'élément chauffant et résistent à des températures élevées ainsi qu'à de nombreux cycles thermiques, ce qui permet d'allonger la durée utile de l'ensemble.

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