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Burner for producing porous glass preform

A technology for porous glass and burners, which is used in manufacturing tools, glass deposition furnaces, glass manufacturing equipment, etc., and can solve problems such as burner tip damage and deposition efficiency changes.

Active Publication Date: 2011-11-09
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Even under the same deposition conditions, individual differences can adversely cause variations in deposition efficiency or cause burner tip damage due to combustion

Method used

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  • Burner for producing porous glass preform
  • Burner for producing porous glass preform
  • Burner for producing porous glass preform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] Such as figure 2 As shown, the burner used to manufacture the porous glass preform includes a first tube for the glass raw material gas injection port in the center, a second tube for the sealing gas injection port, a third tube for the combustible gas injection port, a sealing gas injection port The fourth tube and the fifth tube of the combustion-supporting gas injection port, wherein the third tube surrounds 8 small-diameter combustion-supporting gas injection ports 11 with a focal length of 150 mm. Such as image 3 As shown, the diameters at the tips of the third tube, the fourth tube and the fifth tube are reduced. Intentionally, the fourth tube is axially displaced by 0.5 mm relative to the third tube, and the fifth tube is axially displaced by 0.5 mm relative to the fourth tube.

[0055] Such as Figure 4 As shown, the fourth pipe and the fifth pipe are axially displaced in a direction such that the gap of each gas injection port on the side where the gas inl...

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Abstract

The present invention provides a burner for producing a porous glass preform with a concentric multi-tube structure. The burner has small variations in deposition efficiency with the burner tip being not burned even when axial shift occurs at the concentric multi-tube part of the burner. In the present invention, the gas jet ports disposed outside the gas jet port enclosing the small-diameter gas jet ports are each reduced in diameter in a direction toward a burner tip, and satisfy a relationship of L1>L2>L3>... >Ln, where L1, L2, L3, ... Ln represent lengths from the burner tip to diameter-reduction start positions of the outside-disposed gas jet ports in this order from the inside, respectively, so that the more outward the gas jet port is located, the closer to the burner tip the diameter-reduction start position of the gas jet port is.

Description

technical field [0001] The present invention relates to a burner for manufacturing a porous glass preform having a multi-nozzle type concentric multi-tube structure in which a plurality of gas injection ports are arranged concentrically. Background technique [0002] In the past, various methods have been proposed to manufacture optical fiber preforms. Among them, the external vapor deposition method (OVD method) is widely used because the refractive index distribution of the optical fiber preform to be obtained can be relatively freely set, and large-diameter optical fiber preforms can be mass-produced. The OVD method consists of relatively reciprocating the burner or the starting member, depositing and adhering the glass particles generated in the flame of the burner to the rotating starting member, thereby synthesizing the glass particle deposit (hereinafter referred to as "soot"). ”), the resulting soot was dehydrated in an electric furnace and sintered to create a tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/01C03B37/018
CPCC03B2207/12C03B2207/18C03B2207/14C03B2207/06C03B37/0142C03B2207/20C03B2207/42
Inventor 吉田真
Owner SHIN ETSU CHEM IND CO LTD