Optical fiber drawing furnace

Abstract

The invention relates to an optical fiber drawing furnace which structurally comprises a furnace body, a heat preservation member, a heating element, a thermal insulation layer and sealing units, wherein the heat preservation member, the heating element and the thermal insulation layer are located in the furnace body and used for heating and heat preservation of the drawing furnace; the sealing units are fixed in the middle of the furnace body and comprise three layers of middle sleeves, gas guide tubes and extension tubes, drawing environments where preform rods are arranged are formed in the sealing units, and constant-temperature and oxygen-free drawing environments are provided for the drawing process of the preform rods; a first sealing unit comprises one quartz sleeve and sealing devices; a second sealing unit comprises the first sealing unit, the middle sleeves and the sealing devices; a thermoelectric couple is arranged in a gap between the two units, so that the drawing temperature can be accurately displayed and timely controlled; and an anti-leakage gas plug and a furnace top guide gas inlet device are arranged above and below the middle sleeves respectively, and a gas discharge device is arranged in the middles of the sleeves, so that gas can be conveniently discharged in the drawing process. The optical fiber drawing furnace is suitable for drawing an optical fiber perform rod of special optical fiber and simultaneously has excellent performance of preventing special optical fiber from crystallization and oxidization in the optical fiber drawing process.

Description

technical field [0001] The invention relates to a drawing furnace for drawing special optical fibers and a manufacturing method. The drawing furnace is especially suitable for drawing optical fibers that need to be protected by inert gas in addition to ordinary optical fibers that can be drawn smoothly. Background technique [0002] The optical fiber drawing furnace heats and melts the end of the optical fiber preform, and at the same time moves the optical fiber preform downward, and draws an optical fiber filament of a certain diameter at the end of the optical fiber preform at a certain speed to obtain an optical fiber. [0003] The fiber drawing furnaces usually used in this process are roughly divided into the following types: a traditional communication optical fiber used to draw 125um, and the fiber drawing furnace used to draw this kind of silica fiber usually requires a relatively high temperature of more than 1000° Due to the large wire diameter at high temperature...

AI Technical Summary

Problems solved by technology

[0006] Technical problem: The purpose of the present invention is to provide an optical fiber drawing furnace for manufacturing special optical fibers, so as to solve the above-mentioned problems related to the inability of traditional drawing equipment to draw special optical fibers with excellent performance

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