NOVEL COOLING SYSTEM FOR OPTICAL FIBER DRAWING

摘要

A cooling system for optical fiber drawing is used for decreasing the temperature of an optical fiber before coating, avoiding the occurrence of bubbles in a coating, ensuring a stable coating state of the optical fiber, and reducing the amount of helium gas used, being suitable for high-speed drawing. The cooling system consists of cooling pipe upper and lower shutters, a helium gas guiding device, a cooling pipe body, a cooling water circulating and cooling device, a coated fiber diameter control system, a cooling water pipe and a gas pipe. The cooling pipe body comprises an inner cavity suitable for the optical fiber to pass through; helium gas is blown into the cooling pipe by means of a special helium gas intake device which communicates with the inner cavity and is mounted between two cooling pipes, several single-segment cooling pipes being connected by means of gas intake connection devices; the outer wall of each cooling pipe segment is covered with a polystyrene foam thermal insulating layer, and the helium gas guiding device guides the gas within the pipe at a suitable guiding flow rate to achieve the optimal cooling effect.