Dual-Chamber Gas Generator Closure for Reproducible Hole Opening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In dual type gas generators, the reproducibility of communication hole opening area is compromised due to machining tolerances and sealing tape thickness variations, leading to fluctuating combustion gas releasing characteristics.
Innovation Solution
A gas generator design featuring a closing member with a displacement portion that moves under combustion pressure to uniformly open communication holes, ensuring consistent flow and pressure control, regardless of pressure or load unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sealing tape is used to close communication holes, then the structure is simple and easy to manufacture, but the opening area reproducibility deteriorates due to machining tolerances and tape thickness variations
Solution Approach 1:
The closing member is designed to move from a closed position to an opened position in response to combustion pressure. This dynamic mechanism ensures that regardless of initial positioning variations from machining tolerances, the closing member will open to a consistent position under combustion pressure, achieving reproducible opening area while maintaining simple manufacturing
Solution Approach 2:
The system changes the state of the closing member from static to dynamic by utilizing combustion pressure as an activating parameter. The closing member transitions from a blocked state to an opened state when combustion pressure exceeds a threshold, ensuring consistent behavior despite manufacturing variations in the initial closed position
2Device complexity
If multiple communication holes are closed by sealing tape, then the structure remains simple, but the burst strength varies due to combined effects of hole size differences and tape thickness variations
Solution Approach 1:
Multiple communication holes are closed by a single closing member instead of individual sealing tapes for each hole. This unified approach ensures that all holes open simultaneously when the closing member moves, eliminating the variability caused by different burst strengths of individual sealing tapes while maintaining simple device structure
Solution Approach 2:
The closing member provides a dynamic, unified closure mechanism that responds to combustion pressure. This ensures consistent opening behavior across all communication holes, as the single closing member either blocks all holes or opens all holes together, eliminating the reliability issues associated with variable burst strengths of multiple separate sealing elements
3Device complexity
If communication holes open due to combustion pressure rupturing sealing tape, then the mechanism is simple, but the opening timing and area cannot be controlled precisely
Solution Approach 1:
The closing member is designed to move dynamically in response to combustion pressure, transitioning from a closed to an opened state. This controlled movement ensures precise opening timing and consistent opening area, as the closing member's position is determined by the combustion pressure threshold and its mechanical design rather than by unpredictable rupture behavior of sealing tape
Solution Approach 2:
The closing member acts as an intermediary between the combustion pressure and the communication holes. It provides a controlled interface that translates combustion pressure into a predictable opening action, ensuring precise control over opening timing and area while maintaining the simplicity of the overall mechanism
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 achieves desired releasing characteristics with good reproducibility by preventing inflammation from one combustion chamber to another and allowing controlled combustion gas flow, ensuring consistent performance.
Implementation Method 1
the closing member is configured to have the one or the plurality of communication holes be in the closed state by the closing member being supported by the partition member in the second region due to combustion pressure of the first gas generating agent
Implementation Method 2
the closing member including a displacement portion that is formed continuously so as to be included at least a part of the first region, being displaced in a direction from the side of the second combustion chamber toward the side of the first combustion chamber by combustion pressure of the second gas generating agent acting on the first region
Data Source
AI summary
In a gas generator, a closing member includes: a first region exposed to a side of a second combustion chamber in a closed state, a second region in contact with a partition member from a side of the first combustion chamber in the closed state, and an engagement region that engages an engaged member fixed in a housing in the closed state; and the closing member is configured to have one or a plurality of communication holes be in a closed state by the closing member being supported at the partition member in the second region due to combustion pressure of a first gas generating agent and to have the closed state released by at least a part of the closing member, the closing member including a displacement portion that is formed continuously so as to be included at least a part of the first region, being displaced in a direction from the side of the second combustion chamber toward the side of the first combustion chamber by combustion pressure of a second gas generating agent acting on the first region.