Gas Generator Cup Member Gas Passage Configuration
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Solution Overview
Problem
Existing gas generators for airbag deployment systems face challenges in effectively cooling combustion gases and capturing mist particles, with complex discharge paths leading to reduced gas temperature and increased mist content.
Innovation Solution
A gas generator design featuring a cylindrical housing with a cup member acting as a gas diverting member, where the ratio of cup member length to housing length is optimized between 0.2 to 0.4, and specific gas passage holes are strategically located to balance temperature reduction and mist capture, with optional inclusion of a cylindrical member within the combustion chamber for enhanced mist capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a complex discharge path is used to cool combustion gas, then gas temperature is reduced, but mist content increases
Solution Approach 1:
The gas passage is divided into multiple segments with different functions: a first gas passage for high-velocity gas discharge and a second gas passage for cooling and mist capture. This segmentation allows the system to achieve both temperature reduction and mist content control by directing gas through appropriate pathways based on operational requirements.
Solution Approach 2:
Different regions of the gas passage are designed with distinct characteristics - the first gas passage has a smaller cross-sectional area for rapid discharge, while the second gas passage has a larger cross-sectional area for cooling and mist separation. This local differentiation enables simultaneous optimization of temperature reduction and mist capture in different zones.
2Object-generated harmful factors
If the cup member length is increased to improve mist capture, then device complexity increases
Solution Approach 1:
The cup member is designed to perform multiple functions simultaneously: it serves as a structural component defining the combustion chamber, creates the first and second gas passages through its wall openings, and provides mist capture surfaces. This multi-functionality reduces the need for additional separate components, thereby controlling device complexity while achieving effective mist capture.
Solution Approach 2:
The cup member is positioned within the cylindrical housing, with the combustion chamber nested inside the cup member and gas passages formed within the cup member's wall structure. This nested arrangement maximizes the use of internal space, allowing effective mist capture without proportionally increasing the overall device volume or complexity.
3Temperature
If gas passage holes are positioned for optimal cooling, then temperature reduction improves, but mist capture efficiency decreases
Solution Approach 1:
Gas passage holes are distributed across different locations and orientations on the cup member to create segmented flow paths. Some holes direct gas for rapid cooling while others facilitate mist separation, allowing the system to achieve both temperature reduction and mist capture by utilizing different hole configurations based on operational needs.
Solution Approach 2:
The system dynamically utilizes different gas passage holes depending on operational conditions. The cup member's opening ratio and hole positioning allow flexible control over gas flow distribution, enabling optimization of either cooling or mist capture performance based on the specific operational context and gas generating agent characteristics.
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 design allows for adjustable effects on combustion gas temperature and mist capture by varying the location of gas passage holes, improving gas cooling and mist removal efficiency based on the type of gas generating agent used.
Implementation Method 1
a combustion chamber, which is formed on the side of the ignition device
Implementation Method 2
The gas generated from the gas generant 16 passes through an orifice 18 of the inner housing 14 and a cylindrical gap between the outer housing 12 and the inner housing 14, then goes through the cup member of a double-wall structure
Implementation Method 3
The inner housing 14 and the cup member of a double-wall structure form a zigzag path for the gas flow
Implementation Method 4
no conventional filter is used
Data Source
AI summary
The present invention provides a gas generator in which an effect of decreasing the temperature of a combustion gas and an effect of capturing mist of the combustion gas are adjusted.A cup member disposed in a cylindrical housing has one gas passage hole selected from a first gas passage hole, which is formed in part of a circumferential wall on the side of an opening, a second gas passage hole, which is formed in part of a circumferential wall on the side of a bottom portion, and a third gas passage hole, which is formed between the first gas passage hole and the second gas passage hole. By selecting one of the above gas passage holes, the effect of decreasing the temperature of the combustion gas and the effect of capturing mist of the combustion gas are adjusted.