Double-layer annealing extension tube for high-speed optical fiber drawing

Abstract

The invention relates to the field of optical fiber drawing production and concretely relates to a double-layer annealing extension tube for high-speed optical fiber drawing. The double-layer annealing extension tube comprises an outer metal tube and an inner tube connected with the outer metal tube, wherein the upper part of the outer metal tube is connected with the bottom of a drawing furnace, and the lower part of the outer metal tube is provided with a Venturi effect opening and a furnace ash collecting tray; the upper end of the inner tube is connected with a glass cover, and the lower end of the inner tube is provided with an extension tube siphon nozzle after passing through the Venturi effect opening and the furnace ash collecting tray. Particles generated by an optical fiber and a furnace body are separated in different channels in an optical fiber drawing process, so that the possibility that dust particles are in contact with the optical fiber and a preformed rod is greatly reduced, and the comprehensive quality of the optical fiber is improved. The dust separated in pipelines can be blown to the bottom through arranging the Venturi effect opening on the outer metal tube and introducing nitrogen gas, so that the separated dust can be collected on line, the clearing period of the extension tube is prolonged, the working complexity of operating staff is lowered, and the production cost is lowered.

Description

technical field [0001] The invention relates to the field of optical fiber drawing production, in particular to a double-layer annealing extension tube for high-speed optical fiber drawing. Background technique [0002] At present, as an important carrier of communication, optical fiber plays an increasingly important role in modern communication. With the development of communication technology, the requirements for optical fiber quality are getting higher and higher. As an important indicator of optical fiber quality, strength is directly related to the cost of optical fiber, and has also become the focus of various manufacturers. The mechanical reliability of commercial optical fibers is very important in the design and production of optical cables. In order to ensure that the optical fiber has a certain ability to resist damage, manufacturers now widely use screening experiments on optical fibers. [0003] The screening of optical fiber is tested by applying a 1% screen...

AI Technical Summary

Problems solved by technology

This kind of scrapped optical fiber not only increases the cost of optical fiber, but also reduces the quality of optical fiber itself.

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