Sintering Apparatus Sealing Chamber Pressure Gradient
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Solution Overview
Problem
Existing sintering apparatuses for porous glass base materials face challenges in maintaining air-tightness due to complex assembly and component deterioration, leading to outside air intrusion and gas leakage during sintering, which degrades the quality of the manufactured transparent glass base material.
Innovation Solution
A sintering apparatus with a furnace core tube surrounded by heaters, a lid member with a sealing chamber, and a cylindrical member that generates a pressure difference to control gas flow, maintaining an inner pressure higher than atmospheric pressure and using a discharging port to manage gas flow, preventing outside air entry and gas leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex sealing structure is used to close the furnace core tube, then air-tightness is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent employs a flexible sealing bag (thin film structure) that can be easily installed and removed from the furnace core tube opening. This flexible membrane provides effective sealing without requiring complex rigid structures, thereby maintaining air-tightness while simplifying the overall sealing structure and improving ease of operation.
2Reliability
If a complex sealing structure is used to close the furnace core tube, then air-tightness is improved, but ease of operation deteriorates
Solution Approach 1:
The sealing bag is designed as a flexible thin film that can be easily manipulated during installation and removal operations. Its flexibility allows operators to simply place and secure the bag at the furnace opening without complex assembly procedures, significantly improving ease of operation while maintaining reliable air-tightness.
Solution Approach 2:
The sealing bag is designed as a disposable component that is replaced periodically rather than maintained indefinitely. This approach simplifies operations by eliminating complex maintenance procedures and ensures consistent air-tightness performance throughout the sealing bag's service life without the need for repairs or adjustments.
3Reliability
If sealing components are used, then air-tightness is improved, but reliability deteriorates due to component deterioration over time
Solution Approach 1:
The sealing bag is designed as a disposable component with a defined service life. Instead of using durable but deteriorating sealing components that require maintenance and can fail over time, the system uses inexpensive sealing bags that are replaced periodically. This ensures consistent air-tightness reliability without the degradation issues associated with long-term use of permanent sealing components.
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 solution effectively prevents outside air from entering the furnace core tube and maintains the quality of the sintered glass base material by controlling gas flow and pressure, ensuring a long-lasting and simple sealing structure that does not compromise the optical characteristics of the glass.
Implementation Method 1
a cylindrical member which causes a pressure difference of atmospheres between the gas inside of the tube within the furnace core tube and the gas inside of the sealing chamber to be generated
Implementation Method 2
heating the porous glass base material housed in the furnace core by heaters that surround the furnace core tube
Data Source
AI summary
A sintering apparatus for sintering a porous glass base material, including a furnace core tube surrounded by heaters, the furnace core tube housing the porous glass base material; a lid member having an insertion hole through which a holding rod coupled with the porous glass base material is inserted, the lid member mounted at one end of the furnace core tube; a sealing chamber having a supply port that introduces seal gas and a discharging port that discharges the seal gas, the sealing chamber provided at the lid member covering the insertion hole; and a cylindrical member that causes a pressure difference between gas inside of the tube of an inside the furnace core tube and gas inside of the sealing chamber to be generated while the holding rod is inserted through the cylindrical member inside of the sealing chamber.