Chemical Oxygen Generator Core Channel Tube Design
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Solution Overview
Problem
Emergency oxygen devices using chemical oxygen generators face issues with starting the chemical reaction, non-constant oxygen production, and the need for high-pressure oxygen tanks, which pose safety and maintenance challenges, as well as weight and leakage risks.
Innovation Solution
A chemical oxygen generator with a hollow tube surrounding the solid oxygen source, optimized for improved oxygen production rates, heat transfer, and startup, combined with a piezoelectric ignition system for safer and more controlled ignition, and a flow control unit for regulated oxygen delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a chemical oxygen generator with solid oxygen source is used, then the system avoids high-pressure tanks and their associated safety issues, but the oxygen production rate is non-constant with delayed startup
Solution Approach 1:
The patent applies local quality by creating a pyrolysis-prone starting region with different composition from the bulk oxygen source material. This starting region, positioned at the periphery, has enhanced pyrolysis characteristics that enable rapid initial decomposition and oxygen release, while the central bulk material provides sustained oxygen production throughout the reaction duration.
Solution Approach 2:
The patent implements preliminary action by pre-positioning a pyrolytic ignition unit that can be activated on demand. The ignition unit contains pyrolytic material and is arranged to contact the starting region of the oxygen source, enabling immediate initiation of the chemical reaction when needed, without requiring mechanical or complex electronic starting mechanisms.
2Productivity
If a pressure tank is used to store oxygen, then immediate supply of large amount of oxygen is possible, but the system requires continuous safety checks, maintenance, and has significant weight
Solution Approach 1:
The patent applies parameter changes by transforming the physical state and storage conditions of oxygen. Instead of storing oxygen under high pressure in a tank, the system uses solid oxygen source material that decomposes chemically to release oxygen gas at controlled rates. This parameter change from pressurized gaseous storage to solid-state chemical storage eliminates the need for heavy pressure-containing vessels while enabling sustained oxygen supply.
3Productivity
If a pressure tank is used to store oxygen, then immediate supply of large amount of oxygen is possible, but the risk of leakage and fire increases
Solution Approach 1:
The patent implements an inert environment principle by eliminating pressurized oxygen storage entirely. The solid oxygen source material remains stable until activated by the pyrolytic ignition unit, at which point controlled decomposition occurs. This approach replaces the hazardous pressurized oxygen atmosphere with stable solid material that only becomes reactive under controlled conditions, significantly reducing leakage and fire risks.
4Ease of operation
If mechanical and pyrolytic components interact to start the chemical reaction, then the reaction can be initiated, but the system is prone to misuse and maloperation
Solution Approach 1:
The patent replaces mechanical starting mechanisms with a pyrolytic ignition system. Instead of using mechanical switches, levers, or electronic controls that require precise operation and maintenance, the system uses pyrolytic material that decomposes when exposed to heat or friction from simple user actions like pulling the mask. This substitution of mechanical/electronic starting with pyrolytic chemistry simplifies the system and reduces opportunities for misuse while maintaining reliable operation.
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 configuration ensures a more consistent and rapid oxygen delivery, reduces the risk of misuse, and provides a safer, lighter, and more efficient emergency oxygen system with improved heat transfer and reduced maintenance needs.
Implementation Method 1
the chemical reaction begins which is exothermic and thus causes the solid material to continuously react in a chemical reaction and produce oxygen in a gaseous state
Implementation Method 2
a pyrolytic reaction is started in a pyrolytic ignition unit effecting local heating of the solid material in a starting region
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a chemical oxygen generator for an emergency oxygen device, comprising an outer housing (10) defining an interior space and comprising an outlet opening (33), a solid oxygen source (50) within said interior space containing a material which is able to produce oxygen in a chemical reaction. According to the invention, a hollow tube (40) within said interior space is embedded in said solid oxygen source.