Multi-burner OVD (outside vapour deposition) preparation device of soot optical fiber preforms

Abstract

The invention relates to a multi-burner OVD (outside vapour deposition) preparation device of soot optical fiber preforms. The device comprises a deposition box, an optical fiber preform deposition bracket, burners, an air supply box and an air suction pipe; the device is characterized by also comprising an air suction box, a filter screen and a suction / diffusion laminar-flow plate; the suction / diffusion laminar-flow plate is provided with multiple vent holes; the deposition box below the optical fiber preform deposition bracket is provided with a rectangular air inlet communicated with the air supply box; the air suction box is arranged above the deposition box, and the deposition box above the optical fiber preform deposition bracket is provided with a rectangular air suction hole communicated with the air suction box; the suction / diffusion laminar-flow plate is arranged in the air suction box, and the upside of the air suction box is communicated with the air suction pipe; and the filter screen is arranged at each of an air supply hole and the air inlet. The device disclosed by the invention has the advantages of high deposition rate and high efficiency.

Description

technical field [0001] The invention relates to a preparation device for a loose body optical fiber preform rod, in particular to an OVD deposition preparation device for an optical fiber preform rod with multiple blowtorches. Background technique [0002] The OVD process is a process method in the preparation of optical fiber preforms, that is, the external vapor image chemical deposition process: Outside Vapor Deposition. The main principle of this method is to spray high-purity vapor image raw materials (usually silicon tetrachloride evaporation raw materials) on the outside of the target rod through a blowtorch, and the raw materials are mixed with O at high temperature. 2 Chemical reaction with water vapor to generate SiO 2 Fine particles are deposited on the target rod by thermophoretic effect. The relative movement between the blowtorch and the target rod makes the SiO 2 The fine particles are deposited on the target rod layer by layer until the design weight is re...

AI Technical Summary

Problems solved by technology

[0003] The current soot optical fiber preform OVD deposition preparation device includes a deposition box, an optical fiber preform deposition support, a blowtorch, an air supply box, and an exhaust pipe. The optical fiber preform deposition support is set in the deposition box, and two or three blowtorches Arranged equidistantly under the deposition support for optical fiber preforms, air inlet holes are provided on the side of the air supply box, the air supply box is arranged under the deposition box, and an air inlet is provided on the deposition box below the deposition support for optical fiber preforms The circular hole communicates with the blower box, and the deposition box above the optical fiber preform deposition support communicates with the exhaust pipe; the equipment deposits high-purity SiO2 particles to the target rod placed on the optical fiber preform deposition support through the blowtorch. The OVD deposition preparation devices for soot optical fiber preforms all use double torches or three torches, and the deposition rate and efficiency of this kind of equipment are not high

Images