Furnace for heating glass sheets

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

Patent

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Details

F27D 11/02 (2006.01) F27B 9/24 (2006.01) H05B 3/44 (2006.01)

Patent

CA 2242780

The present invention provides a heater having a heat resistant, thermally and electrically insulating tube having an elongated opening through a wall of the tube and extending along at least a portion of the tube, and a heating element positioned within the tube and extending along at least a portion of the opening. A first portion of a section of the element extending along the opening is exposed and a second portion of the section of the element extending along the opening is shielded by the tube. In one particular embodiment of the invention, the tube is a cylindrically shaped aluminum oxide tube, the heating element is a nichrome wire coil, and the elongated opening is a slot having a constant width which extends between opposing ends of the tube.

La présente invention a trait à un dispositif de chauffage doté d'un tube résistant à la chaleur et qui est isolant sur le plan thermique et électrique. Le tube comporte une ouverture allongée dans une paroi qui s'étend sur au moins une partie de celui-ci, et un élément chauffant est placé dans le tube et s'étend sur au moins une partie de l'ouverture. Une première partie d'une section de l'élément le long de l'ouverture est exposée, et une deuxième partie de la section de l'élément s'étendant le long de l'ouverture est protégée par le tube. Dans une variante particulière de l'invention, le tube a la forme d'un cylindre en oxyde d'aluminium, l'élément chauffant est une bobine de fil de nichrome et l'ouverture allongée est une fente à largeur constante qui s'étend entre les extrémités opposées du tube.

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