VAD blowtorch cleaning device and cleaning method

Abstract

The invention discloses a VAD blowtorch cleaning device. The device comprises a cleaning gas supply cabinet, a cleaning gas supply cabinet main pipe, a cleaning gas supply cabinet branch pipe, a monitoring computer, a PLC controller, a soft air guide exhaust pipe, an automatic valve, a float flow meter, a blowtorch group air intake pipe, and the opening and closing of the clearance of the automatic valve and the gas guide pipe are controlled through a PLC (programmable logic controller) to realize timely and efficient cleaning operation of all layers inside a VAD blowtorch, and the space in all the layers in the blowtorch is precisely cleaned through the flow control. In the blowtorch cleaning process, a combined deposition cavity air draft tube is purged by high-pressure gas to form a large pressure difference inside and outside the blowtorch, so that powder impurities are synchronously sucked out of the outside of the blowtorch to enter a waste gas recovery part. According to the device, the scaling rate of an inner layer of the quartz blowtorch is greatly reduced, the risk of bubbles and optical parameters deterioration of an optical fiber preform core is reduced, the service life of the blowtorch is prolonged, and the production efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of optical fiber preform rod manufacturing, and in particular relates to a VAD blowtorch cleaning device and a cleaning method thereof. Background technique [0002] In the existing optical fiber preform preparation process, the axial vapor deposition method (VAD) is mostly used to produce the core rod, and then the external vapor deposition method (OVD) is used to produce the outer cladding two-step method to produce the optical fiber preform. The equipment for producing mandrels by VAD method is mainly composed of six parts: reaction chamber, blowtorch group, raw gas supply part, loose body (SOOT body) lifting and rotating part, control computer and waste gas recovery part. Among them, the blowtorch group is one of the most critical components. The blowtorch group is usually composed of a wick lamp and one or more wrap lamps, and its function is to spray Sicl 4 、Gecl 4 、H 2 , O 2 The mixed gas of the burner burn...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is: in order to solve the problems in the prior art that the cleaning method of the blowtorch is low in automation, many manual disassembly links are likely to cause damage to the interface of the blowtorch, and the cleaning of the blowtorch is not easy to deal with in a timely manner, thereby providing a VAD blowtorch cleaning device and how to clean it

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