Low-helium preform rod wrapping and sintering device and method thereof

Abstract

The invention discloses a low-helium preform rod wrapping and sintering device and a method thereof. The device comprises a furnace core pipe, an opening is formed in the upper end of the furnace core pipe, and a gas pipe is arranged at the lower end of the furnace core pipe; the upper end of the draught hood is open, the bottom end of the draught hood is fixed to the outer side of a pipe body of the furnace core pipe in a sealed mode, and the sintering assembly is located above the furnace core pipe. The sintering assembly comprises a sintering guide rod, and the sintering guide rod is sequentially provided with a first covering piece, a second covering piece and a third covering piece from top to bottom. The first covering piece covers the upper end opening of the draught hood, and a draught cavity is formed between the first covering piece and the draught hood; a supporting piece is further arranged on the outer side of the furnace core pipe body, the second covering piece covers the upper surface of the supporting piece, and a pressure regulating cavity is formed between the second covering piece and the supporting piece; the third covering piece covers an opening in the upper end of the furnace core pipe; and an air volume adjustable type air draft device is arranged on one side of the air draft cavity and used for controlling air in the air draft cavity to be exhausted. The device has the advantages that the loss of helium and chlorine can be reduced, and meanwhile, the dehydration of the preform rod is more thorough.

Description

technical field [0001] The invention relates to the technical field of optical fiber preform production, in particular to a low-helium preform wrapping sintering device and method thereof. Background technique [0002] The OVD process is currently one of the best processes for preparing low water peak or zero water peak single-mode optical fiber preforms, that is, the external vapor deposition method. The core rod prepared by the OVD process consists of two parts: the core layer and the optical cladding. This process It is widely used by mainstream optical fiber preform manufacturers at home and abroad. [0003] The sintering of the OVD preform soot is the most important process in the preform preparation process. This process directly affects various quality indicators of the optical fiber preform and optical fiber, including preform diameter uniformity, bubble gas line defects, fiber loss, etc. . The process principle of OVD sintering is dehydration and sintering at a hi...

AI Technical Summary

Problems solved by technology

There are the following defects in the above-mentioned prior art: when the exhaust pressure between the inner walls of the exhaust hood is low, the harmful gas HCl generated by the reaction cannot be extracted in time, and there is a greater safety risk if it overflows to the workshop; The loss is serious. When the flow rate of helium and chlorine in the furnace is insufficient

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