Gas Generating Composition Copper Powder Combustion Residue Reduction
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Solution Overview
Problem
Gas generating agents in airbag systems produce ultrafine combustion residues and mist, which can damage the airbag and pose a burn risk to occupants, and the use of fine-mesh filters to mitigate this increases the mass and size of the inflator.
Innovation Solution
A gas generating composition incorporating a copper powder with specific particle size and surface area ranges is used to decrease combustion temperature, reducing the amount of combustion residues and mist, and including fuels, oxidizing agents, binders, and additives to enhance gas purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a fine-mesh metallic filter is disposed inside the inflator to purify gas, then gas purification is improved, but the mass and size of the inflator increase
Solution Approach 1:
The harmful combustion residues and mist are extracted and removed from the gas generating composition through the filter, separating the purified gas from the harmful byproducts. This allows the system to maintain gas generation functionality while eliminating the harmful factors that would otherwise contaminate the airbag.
Solution Approach 2:
A fine-mesh metallic filter with porous structure is used to physically block and trap ultrafine combustion residues and mist particles while allowing the generated gas to pass through. The porous structure provides large surface area for filtration, effectively capturing harmful particles without completely blocking gas flow.
2Object-affected harmful factors
If a fine-mesh metallic filter is disposed inside the inflator to protect occupants, then safety is improved, but the size of the inflator increases
Solution Approach 1:
The filter extracts and removes hot combustion residues and mist that would otherwise be released into the airbag and potentially burn occupants. By separating these harmful hot particles from the gas stream, the system protects occupants while maintaining compact inflator design.
Solution Approach 2:
The fine-mesh porous filter provides thermal protection by trapping hot combustion particles while allowing gas flow, preventing direct contact between hot residues and occupants without requiring excessive inflator size.
3Temperature
If copper powder is added to the gas generating composition, then combustion temperature is decreased and gas purification is improved, but the composition complexity increases
Solution Approach 1:
Copper powder is added as a combustion modifier that changes the combustion parameters, specifically lowering the combustion temperature. This temperature reduction decreases the formation of harmful combustion residues and mist, improving gas purification while maintaining the functional integrity of the gas generating composition.
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 copper powder composition lowers combustion temperature, minimizing combustion residues and hazardous gases like carbon monoxide and ammonia, while maintaining effective gas purification and reducing the size and mass of the inflator filter.
Implementation Method 1
the copper powder decreases the combustion temperature of the gas generating composition
Implementation Method 2
the copper powder decreases the combustion temperature of the gas generating composition and acts to decrease the amount of NH3 and carbon monoxide and the like generated after combustion
Data Source
AI summary
The present invention provides a gas generating composition comprising a fuel and an oxidizing agent and further a copper powder.