Gas Generator Igniter Structure for Directed Combustion Flow
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Solution Overview
Problem
Existing gas generators face issues with inefficient ignition performance due to the diffusion of combustion products away from the gas generating agent, leading to reduced effectiveness in igniting the agent.
Innovation Solution
A gas generator design that includes an igniter assembly with a regulated expansion direction for combustion products using an elastic member with a regulation portion, guiding the combustion products towards the gas generating agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the interval between the igniter and the gas generating agent is widened with the coil spring, then the gas generating agent can be fixed securely, but the combustion product direction becomes diffused and ignition efficiency decreases
Solution Approach 1:
A regulation portion is introduced as an intermediary structure between the coil spring and the igniter cup. This regulation portion acts as a mediator that guides the combustion products from the igniter toward the gas generating agent, ensuring that even with a widened interval, the combustion products maintain a directed flow path and do not diffuse randomly, thereby preserving ignition efficiency while allowing secure fixing of the gas generating agent
Solution Approach 2:
The regulation portion extends in the axial direction (length dimension) to create a guided passage for combustion products. By adding this dimensional element, the system transforms the three-dimensional diffuse expansion of combustion products into a more controlled, directional flow along the axial path toward the gas generating agent, resolving the contradiction between interval width and ignition efficiency
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
Improves ignition performance by directing combustion products effectively towards the gas generating agent, enhancing the ignitability and combustion efficiency of the agent.
Implementation Method 1
an igniter body accommodating an ignition charge, the igniter body including an igniter cup ruptured by a combustion product generated by combustion of the ignition charge
Implementation Method 2
an elastic member having a tubular shape, the elastic member being disposed between the igniter assembly and the gas generating agent in the housing with an axial direction of the elastic member being in an axial direction of the housing
Data Source
AI summary
A gas generator includes an igniter assembly configured to release the combustion product and including an igniter body, the igniter body including an igniter cup ruptured by a combustion product and an electro-conductive pin that supplies a current, a collar portion holding the igniter body, and a holding portion interposed between the igniter body and the collar portion, a housing including a combustion chamber accommodating a gas generating agent, and including a gas discharge port through which a combustion gas is discharged, and an elastic member being disposed between the igniter assembly and the gas generating agent with an axial direction of the elastic member being in a direction same as a direction of the housing, the elastic member including a regulation portion at an inner periphery thereof, the regulation portion being configured to regulate a direction in which the igniter cup ruptured expands.