Airbag Module Vortex Filtration for Valve Particle Blocking
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Solution Overview
Problem
Airbag systems face contamination issues due to solid particles from pyrotechnic igniter reaction products, which can clog or block the filling valve, and existing filtration methods like fabric filters are insufficient in retaining these particles at high gas speeds.
Innovation Solution
An airbag module with a filter housing and vortex induction device that creates a swirling effect in the airbag gas flow, allowing solid particles to adhere to guide surfaces and vortex baffles, ensuring effective separation without significant pressure drop, thus preventing contamination of the filling valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fabric filter is used to retain solid particles, then particle retention is improved, but the high velocity of airbag gas causes insufficient retention and pressure drop increases
Solution Approach 1:
The filter housing is divided into multiple chambers separated by partition walls, with each chamber containing specific filtering components (fabric filter in first chamber, vortex induction device with baffle in second chamber). This segmentation allows different filtering mechanisms to work in sequence, maintaining particle retention while managing pressure drop through distributed resistance across multiple stages.
Solution Approach 2:
The vortex induction device utilizes curved flow paths and rotational motion to separate particles from gas. The baffle creates a vortex flow that forces gas to follow curved trajectories, utilizing centrifugal forces to throw heavier particles outward against the baffle surface for retention, while the gas continues through the filter housing.
2Reliability
If a baffle plate is used to deposit solid particles, then particle separation is improved, but the structure complexity increases
Solution Approach 1:
The baffle serves multiple functions simultaneously: it acts as a particle deposition surface, a flow distributor to create vortex motion, and a structural support element for the filter housing. The partition walls also serve dual purposes as chamber separators and mounting surfaces for filtering components. This merging of functions reduces the number of separate components needed.
Solution Approach 2:
The filter housing structure is designed to perform multiple functions: containing the filtering components, directing gas flow through various chambers, providing mounting surfaces for the fabric filter and vortex device, and serving as the particle retention structure itself through its internal baffles and walls. This multi-functionality eliminates the need for separate structural elements.
3Reliability
If the filter cross-section is reduced to increase filtration, then particle retention is improved, but the pressure difference across the filter increases
Solution Approach 1:
The filter housing is segmented into multiple chambers with partition walls, distributing the filtration function across several stages. Each chamber handles a portion of the gas flow with its own filtering mechanism, preventing any single cross-section from being overly restricted while maintaining overall particle retention through cumulative filtration effect.
Solution Approach 2:
The system changes the flow regime parameter from straight-line flow to rotational vortex flow within the second chamber. This parameter change allows particles to be separated through centrifugal forces acting on the rotating gas, enabling effective particle retention without requiring a reduced cross-sectional area that would increase pressure drop.
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 cleans the airbag gas of solid particles, reducing the risk of valve blockage and maintaining the airbag deployment process's efficiency by ensuring a low pressure difference across the filter, thus enhancing the reliability of the airbag module.
Implementation Method 1
A vortex induction device is arranged upstream of the outlet to generate a vortex in the airbag gas flow
Implementation Method 2
a vortex, i.e. a swirl with a swirling effect, is created in the airbag gas flow, which causes the airbag gas flow to undergo a flow deflection
Implementation Method 3
allowing solid particles to adhere to guide surfaces and vortex baffles
Data Source
Figure 1
Figure 2~4
AI summary
The invention relates to an airbag module (10) having an airbag (14) and a gas generator (12), between which a filling valve (20) is arranged, wherein the gas generator (12) is opened by an igniter (22), wherein a filter housing (32) is arranged before the filling valve (20) in the flow direction (S) of the released airbag gas (16), said filter housing having a vortex induction device (38) for generating a vortex (42) in the airbag gas flow (28).