Dual Cup Ignition Device Heat Insulation Gap
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Solution Overview
Problem
Existing gas generators face challenges in preventing the combustion heat from one combustion chamber from igniting the gas generating agent in another chamber, as current insulator barrier materials like fiberglass with adhesive-backed foil tape do not provide sufficient insulation, making it difficult to cover entire surfaces effectively.
Innovation Solution
The proposed ignition device features a first and second cup member with a gap acting as a heat insulating layer, where the first cup member covers the igniter collar and the second cup member encloses it, with openings that remain closed before actuation and open only when gas is generated, utilizing an air layer for insulation and incorporating projections to maintain the gap even under thermal influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If insulator barrier material like fiberglass with adhesive-backed foil tape is used to prevent heat transfer between combustion chambers, then heat insulation is improved, but the material cannot effectively cover entire surfaces and provides insufficient insulation
Solution Approach 1:
The patent introduces a cup member as an intermediary heat insulating structure positioned between the two combustion chambers. This cup member physically separates the chambers and prevents direct heat transfer, solving the insufficiency of conventional insulator materials. The cup member acts as a mediator that blocks thermal energy while maintaining the functional separation of the combustion chambers.
2Temperature
If a cup member is introduced as a heat insulating structure between combustion chambers, then heat insulation is improved, but device complexity increases
Solution Approach 1:
The cup member is designed to serve multiple functions simultaneously: it acts as a heat insulating barrier between combustion chambers, provides structural support for the gas generating agent, and maintains the geometric separation of chambers. By combining these functions into a single component, the patent reduces overall device complexity while achieving effective heat insulation.
3Temperature
If the entire surface of the cup member is covered with insulator barrier material, then heat insulation is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent utilizes a thin-walled cup member structure that inherently provides heat insulation through its geometry and material properties. Instead of requiring extensive coverage with rigid insulator materials, the thin film structure of the cup member achieves sufficient thermal barrier performance while being easier to manufacture and assemble.
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 design effectively prevents erroneous ignition by providing a robust heat insulating effect, ensuring the gas generating component in the first cup member is not affected by external heat, thereby maintaining the integrity of the gas generator's operation.
Implementation Method 1
a gap being formed between an outer surface of the first cup member and an inner surface of the second cup member to function as a heat insulating layer
Data Source
AI summary
An ignition device includes an igniter fixed to an igniter collar, a first cup member filled with a gas generating component therein, and a second cup member. The first cup member covers the igniter collar to enclose a portion including an ignition portion of the igniter. The second cup member covers the igniter collar to enclose the first cup member. A gap is formed between an outer surface of the first cup member and an inner surface of the second cup member to function as a heat insulating layer. The first cup member has a first opening, and the second cup member has a second opening. At least one of the first opening and the second opening is closed before actuation and is opened only when gas is generated from the gas generating component.