Electrical coil insulator

H - Electricity – 05 – B

Patent

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Details

H05B 3/06 (2006.01) H05B 3/16 (2006.01)

Patent

CA 2250953

An electrical resistance heater (12) has an elongate electrical heating coil (C) with a plurality of convolutions (C1, C2) . An electrical insulator (10) supports the convolutions and includes an insulator body (18) mountable to a support frame (19). A generally circular projection (20) extends from one side of the body and is integrally formed therewith. A generally arcuate section (26, 28) of the projection, on opposite sides of the projection, is spaced from an adjacent surface (30, 32) of the body. A notch (34, 36) is formed by the respective surfaces of the body and the projection for respective coil convolutions (C1, C2) to be received in the respective notches. The upper end (42, 44) of the faces (38, 40) of the projection are tapered outwardly from the top of the projection to facilitate coil installation. A shoulder (30s, 32s) formed on the insulator body adjacent each notch helps retain the coil convolutions in the notches. An insulator (110) having a pair of projections (120a, 120b) integrally formed with an insulator body (118) is used to support coil convolutions on both sides of the insulator.

Appareil de chauffage à résistance (12) comprenant un serpentin de chauffage (C) avec une pluralité de convolutions (C1, C2). Un isolateur électrique (10) supporte les convolutions et comprend un corps isolateur (18) pouvant être monté sur un châssis de support (19). Une projection généralement circulaire (20) dépasse d'un côté du corps, à l'intérieur duquel elle est formée intégralement. Une section généralement arquée (26, 28) de la projection, sur les côtés opposés de la projection, est à distance de la surface adjacente (30, 32) du corps. Une encoche (34, 36) est formée par les surfaces respectives du corps et la projection des convolutions respectives du serpentin (C1, C2) devant être reçues dans les encoches respectives. L'extrémité supérieure (42, 44) des faces (38, 40) de la projection est effilée vers l'extérieur, à partir du sommet de la projection, afin de faciliter l'installation du serpentin. Un épaulement (30s, 32s) formé sur le corps de l'isolateur à coté de chaque encoche aide à maintenir les convolutions dans les encoches. Un isolateur (110) ayant une paire de projections (120a, 120b) formées intégralement par un corps isolant (118) est utilisé pour supporter les convolutions du serpentin sur les deux côtés de l'isolateur.

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