Vaporizer With Closed-Loop Conduit For Glass Fiber Preform
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Solution Overview
Problem
Conventional vaporizers for forming glass optical fiber preforms suffer from incomplete vaporization of liquid precursors, leading to gel formation and increased manufacturing costs due to frequent cleaning needs and limited vaporization rates, as well as inefficient liquid delivery systems that reduce the surface area for vaporization.
Innovation Solution
A vaporizer design featuring a closed-loop liquid delivery conduit with nozzles oriented at specific angles and positioned to maximize contact with the side wall of an expansion chamber, combined with a heating system to maintain optimal temperatures, allowing for higher flow rates and reduced gelation by ensuring uniform vaporization across a larger surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional vaporizers are used to vaporize liquid precursor, then the vaporization process can be maintained continuously, but incomplete vaporization occurs leading to gel formation and frequent cleaning requirements
Solution Approach 1:
The liquid delivery system is segmented into multiple nozzles distributed around the expansion chamber, each delivering liquid precursor to different locations. This segmentation ensures more uniform vaporization across the chamber and prevents localized gel formation, allowing continuous operation without frequent cleaning
Solution Approach 2:
A closed-loop liquid delivery conduit is introduced as an intermediary system between the liquid precursor source and the vaporization zone. This conduit system with strategically positioned nozzles ensures complete vaporization by distributing liquid uniformly and collecting any unvaporized liquid for recirculation, preventing gel accumulation
2Productivity
If the liquid precursor flow rate is increased to improve productivity, then manufacturing output increases, but incomplete vaporization occurs more frequently leading to gelation
Solution Approach 1:
The liquid delivery system transitions from a single-point or limited-point injection to a three-dimensional distributed nozzle array around the expansion chamber. This spatial distribution in multiple dimensions ensures that even at high flow rates, the liquid precursor is vaporized uniformly across the entire chamber volume
Solution Approach 2:
The closed-loop liquid delivery conduit provides feedback by collecting any unvaporized liquid precursor from the expansion chamber and returning it to the injection system. This feedback mechanism ensures complete vaporization by continuously adjusting the distribution until all liquid is vaporized, maintaining precision even at high flow rates
3Reliability
If the vaporizer surface area is increased to improve vaporization efficiency, then gelation is reduced, but the device complexity and size increase
Solution Approach 1:
The closed-loop liquid delivery conduit serves multiple functions: it distributes liquid precursor through multiple nozzles, defines the vaporization path, collects unvaporized liquid, and provides structural support for the nozzle array. This multi-functionality achieves gelation resistance without proportionally increasing device complexity
Solution Approach 2:
The nozzle array and liquid delivery conduit are nested within the existing vaporizer housing and expansion chamber structure. The conduit system is integrated into the available space rather than requiring additional external structures, achieving increased effective vaporization surface area without proportionally increasing overall device size or complexity
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
The design enhances vaporization efficiency, reduces gelation, and allows for higher flow rates of liquid precursor, thereby increasing manufacturing productivity and reducing equipment downtime by ensuring nearly complete vaporization of the liquid precursor.
Implementation Method 1
The closed-loop liquid delivery conduit comprises a plurality of nozzles oriented to direct a spray of liquid precursor onto an inner surface of the side wall
Implementation Method 2
The vaporizer is configured to vaporize liquid precursor for formation of glass optical fiber preforms
Implementation Method 3
combined with a heating system to maintain optimal temperatures, allowing for higher flow rates and reduced gelation by ensuring uniform vaporization
Data Source
AI summary
Vaporizers and systems for vaporizing liquid precursor for forming glass optical fiber preforms are provided. The vaporizer includes an expansion chamber at least partially enclosed by a side wall, the expansion chamber comprising an upper end and a lower end with the side wall disposed between the upper end and the lower end. The vaporizer further includes a closed-loop liquid delivery conduit positioned in the expansion chamber proximate to the upper end of the expansion chamber, wherein the closed-loop liquid delivery conduit comprises a plurality of nozzles oriented to direct a spray of liquid precursor onto an inner surface of the side wall. Further, the vaporizer includes at least one supply conduit positioned proximate the upper end of the expansion chamber and coupled to the closed-loop liquid delivery conduit, and a vapor delivery outlet coupled to the expansion chamber and configured to direct vaporized liquid precursor from the expansion chamber.