Flexible Furnace Seal Assembly for Variable Fiber Preform Diameters
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Solution Overview
Problem
Conventional sealing assemblies for optical fiber draw furnaces lack flexibility and elasticity, leading to issues with high diameter variations in glass preforms, which can introduce oxygen and degrade furnace health and optical fiber quality.
Innovation Solution
A flexible sealing assembly with multiple curved ring sections and tension loaders that allow radial movement, creating a seal despite varying preform diameters, using a spring tension mechanism to accommodate diameter variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional felt rings are used for sealing, then the sealing structure is simple, but the flexibility and elasticity are insufficient to handle high diameter variations greater than 5 mm
Solution Approach 1:
The sealing assembly is divided into multiple curved ring sections (at least three) that can move independently relative to each other. Each ring section can radially expand or contract to accommodate diameter variations in the glass preform, providing flexibility without requiring a completely complex adaptive structure. This segmentation allows the sealing system to adapt to preform diameter variations greater than 5 mm while maintaining a relatively simple overall design.
Solution Approach 2:
The curved ring sections are designed to be radially movable rather than fixed, allowing dynamic adjustment to match the preform diameter. The rings can expand outward or contract inward radially to maintain sealing contact with preforms of varying diameters. This dynamic capability provides the necessary flexibility to handle diameter variations while keeping the structural complexity manageable through controlled movement degrees.
2Adaptability or versatility
If a rigid sealing structure is used, then the structure is stable, but it cannot accommodate diameter variations in glass preforms leading to oxygen ingress
Solution Approach 1:
By segmenting the sealing structure into multiple independent curved ring sections, each section can radially adjust to accommodate diameter variations in the glass preform. This segmentation allows the sealing system to adapt to different preform sizes while maintaining overall sealing reliability, as each ring section independently conforms to the preform surface, preventing oxygen ingress despite dimensional variations.
Solution Approach 2:
The curved ring sections are designed with flexible characteristics that allow them to radially expand and contract while maintaining their structural integrity. This flexibility enables the sealing rings to conform to preforms with diameter variations greater than 5 mm, ensuring reliable sealing by maintaining continuous contact with the preform surface without compromising sealing reliability.
3Adaptability or versatility
If felt rings with minimum diameter specification are used, then manufacturing is simple, but elasticity is insufficient for high diameter variation preforms
Solution Approach 1:
The sealing assembly uses multiple curved ring sections that can be manufactured as separate components with standard elastic properties. Each ring section is simpler to manufacture than a single complex adaptive ring, as they can be produced using conventional methods and then assembled. The segmentation allows the use of materials with adequate elasticity without requiring complex manufacturing processes, thus improving elasticity while maintaining ease of manufacture.
Solution Approach 2:
The sealing assembly combines multiple ring sections with tensioning mechanisms, potentially using composite construction that integrates elastic materials with structural support elements. This composite approach enhances the overall elasticity and adaptability of the sealing system while using materials and construction methods that remain relatively simple to manufacture, avoiding the need for complex single-component solutions.
4Adaptability or versatility
If multiple curved ring sections with tension loaders are used, then flexibility and sealing capability improve, but device complexity increases
Solution Approach 1:
The sealing assembly is segmented into multiple curved ring sections that can be independently positioned and tensioned. This segmentation provides sealing adaptability to diameter variations while keeping each individual ring section relatively simple in design. The modular nature of segmented rings allows for easier assembly and maintenance, offsetting some of the complexity introduced by having multiple sections with tension loaders.
Solution Approach 2:
The tension loaders enable independent adjustment of radial tension parameters for each curved ring section. By allowing parameter changes in tension force distribution, the system achieves high sealing adaptability to various preform diameters. This parameter adjustability compensates for the increased device complexity, as the ability to fine-tune tension parameters provides superior sealing performance that justifies the additional 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 flexible sealing assembly effectively seals against varying preform diameters, preventing oxygen ingress and maintaining furnace health, resulting in improved mechanical and optical properties of the optical fiber.
Implementation Method 1
a plurality of tension loaders (114) exerting continuous radially inward force on at least one curved ring section
Data Source
AI summary
A flexible sealing assembly (100) for an optical fiber draw furnace (500) comprising a first plurality of curved ring sections (110) arranged in a circular arrangement and a plurality of tension loaders (114) exerting continuous radially inward force on at least one curved ring section. Each curved ring section of the first plurality of curved ring sections (110) is separated from each other and defined by the same radius of curvature. Further, the first plurality of curved ring sections (110) is radially movable such that the first plurality of curved ring sections (110) creates a seal between a glass preform (504) and a vertical hollow body (506) in the optical fiber draw furnace (500). The diameter of the glass preform (504) varies.