Gas Generator Filter Positioning to Suppress Short Paths
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Solution Overview
Problem
In gas generators, filters can deform radially due to combustion pressure, leading to gaps and 'short paths' where combustion gas bypasses filtration, potentially reaching the discharge port without being filtered or cooled.
Innovation Solution
The filter is positioned within the housing such that at least one end surface is supported by contact, with a predetermined outer peripheral area adjacent to a space, preventing radial deformation and ensuring the filter remains in place, thereby preventing gaps and ensuring combustion residue is captured before it reaches the discharge port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the filter is not supported at its outer peripheral surface, then the filter structure is simple and easy to manufacture, but the filter deforms radially outward under combustion pressure creating gaps and short paths
Solution Approach 1:
The housing is designed with a localized protruding portion that provides support only at the outer peripheral surface of the filter near one end surface. This localized support structure prevents radial deformation and gap formation without requiring complex overall filter support mechanisms, thus maintaining ease of manufacture while improving reliability.
2Reliability
If the filter is supported at multiple locations, then the filter remains stable and prevents deformation, but the housing structure becomes more complex
Solution Approach 1:
Instead of distributing multiple support locations throughout the housing, the invention concentrates the support function into a single protruding portion on the housing that locally contacts the filter's outer peripheral surface. This simplifies the housing structure while effectively preventing filter deformation.
3Object-generated harmful factors
If the filter outer peripheral area is adjacent to a predetermined space, then combustion residue can be captured effectively, but the housing volume is reduced
Solution Approach 1:
The invention creates a localized predetermined space between the filter's outer peripheral surface and the housing inner wall, concentrated at the region where combustion residue is most likely to accumulate. This targeted approach captures harmful residues effectively while minimizing the overall volume consumed, compared to creating uniform spacing throughout.
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 configuration effectively suppresses the formation of short paths and ensures that combustion gas is filtered and cooled before discharge, preventing unfiltered gas and residue from reaching the outside.
Implementation Method 1
a filter having a cylindrical shape, including the combustion chamber in an interior thereof, and disposed between the combustion chamber and the gas discharge port
Implementation Method 2
configured to burn a gas generating agent by actuation of an igniter, thereby generating combustion gas
Data Source
AI summary
A gas generator including a housing, an igniter disposed inside the housing, a combustion chamber accommodating the igniter, a gas discharge port provided in the housing, and a filter having a cylindrical shape and disposed between the combustion chamber and the gas discharge port. The filter is positioned inside the housing such that a portion of at least one end surface of two end surfaces in an axial direction of the filter is supported by contact, an outer area positioned outward in a radial direction of the portion that is supported by contact is adjacent to a predetermined space, and a predetermined outer peripheral area of an outer peripheral surface of the filter near the at least one end surface is supported by contact. According to such a configuration, it is possible to suppress a short path of combustion gas in a gas generator equipped with a filter.