Graphite furnace for sintering glass loose mass

Abstract

The invention discloses a graphite furnace for sintering glass loose mass. The graphite furnace comprises a graphite furnace body provided with a mounting hole at one end and a quartz tube connected with the other end of the graphite furnace body, wherein an air outlet end of the quartz tube extends out of the mounting hole. The graphite furnace further comprises a sealing device arranged at the mounting hole of the graphite furnace body and used for sealing the mounting hole, wherein the sealing device is provided with an air inlet unit; and the joint of the graphite furnace body and the quartz tube is provided with an air exhausting device. In the embodiment of the invention, the graphite furnace body is set as a sealed structure by the sealing device, and the air inlet unit and the air exhausting device are arranged on the graphite furnace body. In the production process, when a process gas is introduced into the quartz tube, a protective gas is introduced into the sealed graphite furnace through the air inlet unit to increase the external pressure of the quartz tube, thus the balance between internal pressure and external pressure of the quartz tube is guaranteed to prevent the quartz tube from deformation. Consequentially, the service life of the graphite furnace is prolonged effectively.

Description

technical field [0001] The invention relates to the technical field of optical fiber preparation, in particular to a graphite furnace for sintering glass loose body. Background technique [0002] Dehydration sintering of glass loose body is one of the main steps in producing optical fiber preform. The core rod glass loose body manufactured by VAD (vertical axial deposition, vertical axial deposition method) needs to be dehydrated and sintered to obtain an optical fiber preform core rod with a low water peak, which is produced by OVD (Outside Vapor Deposition, external vapor deposition method) The obtained loose optical fiber preform also needs to be dehydrated and vitrified to obtain a transparent optical fiber preform. [0003] At present, the heating furnaces used in the optical fiber preform manufacturing industry mainly include vacuum graphite furnaces, graphite furnaces and silicon-molybdenum rod resistance furnaces. With the continuous increase of the size of the VAD...

AI Technical Summary

Problems solved by technology

[0004] In the process of dehydration vitrification of glass loose body, it is necessary to add inert gas, dehydration gas and oxygen in the quartz sleeve to complete the dehydration vitrification of glass loose body, which makes the pressure inside and outside the quartz tube unbalanced, resulting in the quartz tube being prone to Deformation or even damage seriously reduces the service life of the graphite furnace

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