Burner Ejecting Port Design for Glass Preform Deposition
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Solution Overview
Problem
Existing methods for producing glass preforms using OVD or VAD processes face challenges in increasing the yield of glass source material when depositing glass particles on a starting rod, as they require expensive vaporization equipment and have inefficient reaction promotion.
Innovation Solution
A production method involving a burner with multiple ejecting ports for glass source material, where the area of each port is optimized to be 2.25×10−4 or less of the flame forming area, and gas jetting ports are positioned close to the liquid material ports to enhance reaction efficiency and reduce the need for vaporization equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If glass source material is supplied as liquid through ejecting ports in the burner, then vaporization equipment is eliminated and production cost is reduced, but glass source material yield must be increased to maintain deposition efficiency
Solution Approach 1:
The invention changes the physical state parameter of the glass source material from vapor (requiring vaporization equipment) to liquid (supplied directly through ejecting ports). This parameter change eliminates the need for vaporization equipment while maintaining deposition efficiency through optimized liquid delivery parameters including ejecting port area ratios and gas jetting configurations
Solution Approach 2:
The invention uses gas jetting through gas jetting ports to atomize and deliver liquid glass source material through ejecting ports. This pneumatic mechanism replaces the need for thermal vaporization equipment while ensuring efficient delivery of glass source material to the deposition zone, thereby maintaining productivity without expensive vaporization systems
2Productivity
If the area of ejecting ports is reduced to 2.25×10−4 or less of the flame forming area, then glass source material yield is increased, but the precision of port positioning and sizing must be greatly improved
Solution Approach 1:
The invention establishes a specific parameter range for the ejecting port area ratio (2.25×10−4 or less of the flame forming area) that optimizes glass source material yield. By defining this critical parameter with clear numerical boundaries, the invention makes the precision requirement quantifiable and controllable during manufacturing, transforming an abstract precision challenge into a measurable design parameter
Solution Approach 2:
The invention applies different area ratios to different ejecting ports based on their specific positions and functions within the burner. This local optimization allows each port to be precisely sized according to its specific role in the deposition process, thereby achieving high glass source material yield without requiring uniform high-precision manufacturing across all ports
3Productivity
If gas jetting ports are positioned close to liquid material ejecting ports (within 1.0 mm), then reaction efficiency is improved, but the difficulty of burner manufacturing and assembly is increased
Solution Approach 1:
The invention defines a specific positional parameter for gas jetting ports relative to liquid material ejecting ports (within 1.0 mm distance). This quantified parameter transforms the abstract concept of 'close positioning' into a precise manufacturing specification, enabling consistent reproduction of the optimal configuration while managing manufacturing complexity through clear dimensional guidelines
Solution Approach 2:
The invention separates the burner into distinct functional modules: liquid material ejecting ports for glass source delivery, gas jetting ports for atomization and reaction promotion, and flame forming zones for deposition. This segmentation allows each component to be manufactured and positioned independently with controlled tolerances, reducing overall assembly complexity while maintaining the required 1.0 mm or less positioning accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method increases the glass source material yield by promoting efficient reaction and atomization, reducing production costs, and eliminating the need for expensive vaporization equipment, while producing a transparent glass preform.
Implementation Method 1
the glass source material is subjected to flame thermal decomposition in the flame formed by the burner to thereby form glass particles
Implementation Method 2
gas jetting ports are arranged in such a manner that the inner periphery of the gas jetting port is positioned outside by 1.0 mm or less from the outer periphery of the liquid material ejecting port, and a gas is jetted out from the gas jetting port
Implementation Method 3
the formed glass particles are deposited on the starting rod to produce a glass particulate deposit
Implementation Method 4
the thus-produced glass particulate deposit is heated to give a transparent glass preform
Data Source
AI summary
A production method for a glass particulate deposit which includes a deposition step in which, at least two liquid source material ejecting ports 31a for a glass source material 23 jetting out from a burner 22 are provided per one burner 22, the area of at least one liquid source material port 31a is 2.25×10−4 or less of the area of the flame forming part of the burner 22, the glass source material 23 is, in the form of a liquid thereof, supplied to each liquid material source port 31a, jetting gas ports 31b are arranged in such a manner that the inner periphery of the jetting gas port is positioned outside by 1.0 mm or less from the outer periphery of each liquid source material port 31a, and a gas is jetted out from each gas jetting port 31b.