A method and system for online cooling of optical fiber drawing

Abstract

The invention discloses an on-line cooling system for optical fiber drawing. The on-line cooling system comprises a liquid nitrogen container, a liquid nitrogen pump, a cooling tube and a gasifier, wherein the liquid nitrogen container is connected with the liquid nitrogen pump and the cooling tube and is used for storing nitrogen; the liquid nitrogen pump is used for conveying liquid nitrogen from the liquid nitrogen container to the cooling tube so as to realize primary cooling of a high-temperature optical fiber passing through the entire cooling tube; the gasifier is connected with the cooling tube and is used for gasifying a path of liquid nitrogen flowing out after the cooling of the cooling pipe and introducing low-temperature nitrogen produced after gasification of liquid nitrogeninto the cooling tube to realize secondary cooling of the high-temperature optical fiber passing through the entire cooling tube; and the liquid nitrogen container is also used for collecting the other path of liquid nitrogen flowing out after the cooling of the cooling pipe. The on-line cooling system of the invention can solve the technical problem that the hydrogen used as cooling gas in the prior art is prone to explosion at a high temperature and easily leads to safety accidents.

Description

technical field [0001] The invention belongs to the technical field of optical fiber manufacturing equipment, and more particularly relates to an online cooling method and system for optical fiber drawing. Background technique [0002] The speed of optical fiber production is getting higher and higher, and the current conventional production speed has reached 3000m / min. In the existing optical fiber production, helium is mainly used to cool the fiber drawing. However, helium is an expensive rare gas, and its content in air is only about 5.2 parts per million. Therefore, the development of cooling systems that can replace helium is critical to reduce the cost of optical fiber production. [0003] Chinese patent application CN103274593A proposes an online cooling system for optical fiber drawing using hydrogen, but this system has some disadvantages that cannot be ignored: First, hydrogen is an extremely flammable gas with an ignition point of only 574°C. When the concentrat...

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Problems solved by technology

[0003] Chinese patent application CN103274593A proposes an online cooling system for optical fiber drawing using hydrogen, but this system has some disadvantages that cannot be ignored: first, hydrogen is an extremely flammable gas with an ignition point of only 574°C. When the concentration is 4% to 74%, the mixed gas is very easy to detonate under the stimulation of heat and sunlight; secondly, during the production process of the optical fiber, the temperature of the optical fiber entering the cooling system will reach 900°C, if hydrogen is used to cool the optical fiber If the process is not well controlled, safety accidents will easily occur

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