Method and apparatus for sealing the top of a furnace for...

C - Chemistry – Metallurgy – 03 – B

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C03B 37/029 (2006.01) C03B 37/027 (2006.01)

Patent

CA 2363676

An apparatus and method for sealing the top (preform entry end) of an optical waveguide fiber draw furnace is disclosed. The apparatus includes an assembly (10) constructed and arranged to removably cover the top of the draw furnace (60) while mating with the downfeed handle (28). The apparatus includes an elongated sleeve (12) having a base (16) and a sealing mechanism (18) positioned on the sleeve at a location remote from the base. The sleeve (12) defines a chamber (50) for receiving the downfeed handle (28), and the sealing mechanism (18) is arranged with respect to the sleeve to mate with the downfeed handle received in the chamber. In one aspect of the invention, the apparatus further includes an inert gas purge (22, 24, 26) for providing an inert atmosphere within the chamber (50). A method of sealing the top of an optical waveguide fiber draw furnace is also disclosed.

Cette invention concerne un dispositif et un procédé permettant d'obturer le haut (extrémité entrée des ébauches) d'un four d'étirage de fibres optiques. Le dispositif comprend un ensemble (10) qui est conçu et agencé pour obturer de façon amovible le haut (extrémité entrée des ébauches) d'un four d'étirage (60) et qui est adapté à la poignée d'alimentation supérieure (28). Le dispositif comprend un manchon allongé (12) avec un socle (16) et un mécanisme d'obturation (18) disposé sur le manchon en un point éloigné du socle. Le manchon (12) définit une chambre (50) recevant la poignée (28). Le mécanisme d'obturation (18) est disposé par rapport au manchon de manière à s'adapter à la poignée d'alimentation supérieure qui s'emboîte dans la chambre. Selon un aspect de cette invention, ce dispositif comporte en outre une purge (22, 24, 26) permettant de créer une atmosphère inerte dans la chambre (50). L'invention concerne également un procédé d'obturation du haut d'un four à étirage pour conducteurs optiques.

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