Axial Gas Generator Filter Layout for Even Residue Distribution
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Solution Overview
Problem
The existing gas generators suffer from inefficient use of filters due to uneven distribution of combustion residues, with higher residue amounts on the inflow side of the filter, leading to reduced effectiveness and size constraints.
Innovation Solution
The gas generator design includes a filter extending in the axial direction with one end connected to the housing, a partition wall member allowing communication between the combustion and filter chambers, and optimized communication holes to direct combustion gas flow, enhancing filtration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If combustion gas flows from the inner peripheral surface to the outer peripheral surface of the cylindrical filter, then the filter structure is simple, but the contained residue amount is large on the inflow side and small on the outflow side, resulting in inefficient filter use
Solution Approach 1:
The patent inverts the conventional flow direction through the filter. Instead of flow moving from the inner peripheral surface to the outer peripheral surface, the combustion gas now flows from the outer peripheral surface to the inner peripheral surface. This inversion allows the gas to enter through the larger outer circumference and exit through the smaller inner circumference, distributing residues more evenly across the filter surface and improving overall filter utilization efficiency.
2Volume of moving object
If the filter is made smaller to reduce gas generator size, then the overall device size decreases, but the filter cannot handle the residue load efficiently due to uneven residue distribution
Solution Approach 1:
By inverting the flow direction to move from outer to inner peripheral surface, the patent improves residue distribution efficiency. This allows a smaller filter to handle the same residue load effectively, as the reversed flow pattern ensures more uniform utilization of the entire filter surface area, preventing localized saturation and maintaining performance in a compact configuration.
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 improves filter use efficiency by evenly distributing residue accumulation, allowing smaller filters to achieve the same performance as larger ones, thus reducing the overall size of the gas generator.
Implementation Method 1
a tubular filter may be disposed between the combustion chamber and the gas discharge port
Implementation Method 2
burns the gas generating agent by an igniter to generate combustion gas
Data Source
AI summary
A gas generator includes: a housing; an ignition unit disposed in the housing; a gas generating agent accommodated in a combustion chamber in the housing and that generates a combustion gas upon operation of the ignition unit; a discharge port provided in the housing and configured to discharge the generated combustion gas; and a filter disposed between the discharge port and the gas generating agent. The filter extends in an axial direction, at least an outer peripheral portion on one end surface of the filter in the axial direction is connected to an inner wall surface of the housing to surround the discharge port, a portion that is at least a part of an outer peripheral surface of the filter around an axis and extends over the entire circumference is an inflow portion of the combustion gas, and the inflow portion is in communication with the combustion chamber.