Pyrotechnic Gas Generator Filter with Sealed Protection Screen
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Solution Overview
Problem
Filters for pyrotechnical gas generators face issues such as deformation during ignition, causing gas flow obstruction and variability in inflation speed, and hot particles/gases bypassing the filtering material, reducing ignition quality.
Innovation Solution
A filter design featuring a sealed protection screen forming a closed loop around the pyrotechnical charge to absorb pressure waves and protect the filtering material, preventing deformation and ensuring hot gases/particles remain in contact with the propellant, thus maintaining consistent ignition and flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter with filtering material is placed between the combustion chamber and discharge nozzles, then gas filtration is achieved, but the filter deforms during ignition causing gas flow obstruction and variability in inflation speed
Solution Approach 1:
The filter is divided into two distinct functional components: a filtering material for gas filtration and a protection screen for structural stability. The protection screen forms a sealed loop that surrounds the pyrotechnical charge, creating a segmented structure where each component performs its specific function without interfering with the other.
Solution Approach 2:
The protection screen acts as an intermediary element between the pyrotechnical charge and the filtering material. It absorbs and contains the pressure wave generated during ignition, preventing direct transmission of mechanical stress to the filtering material, thus protecting it from deformation while allowing gas filtration to proceed.
2Volume of moving object
If the filter is placed close to the pyrotechnical charge for compact design, then space is saved, but hot particles and gases bypass the filtering material reducing ignition quality
Solution Approach 1:
The protection screen serves as an intermediary containment structure that directs hot particles and gases generated during ignition to remain in intimate contact with the pyrotechnical charge. The sealed loop configuration ensures that combustion products are channeled through the propergol rather than bypassing it, maintaining reliable ignition while allowing compact positioning near the charge.
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 solution effectively prevents filter deformation and ensures consistent gas flow and ignition quality by providing structural rigidity and containment, reducing the risk of nozzle obstruction and enhancing the repeatability of the gas generator's operation.
Implementation Method 1
the protection screen forms at least a sealed loop arranged to surround at least a part of a charge of propergol of the pyrotechnical gas generator so as to protect this at least one part of the filtering material from a pressure wave from the ignition of the propergol charge
Implementation Method 2
The closed loop then receives the stresses imposed during the operation of the gas generator, and especially during the ignition phase, with the pressure wave generated by the ignition and/or the propergol
Data Source
AI summary
A filter for a pyrotechnical gas generator includes a filtering material and a protection screen. The protection screen forms at least one sealed loop arranged so as to surround at least a part of a charge of propergol of the pyrotechnical gas generator in such a manner as to protect this at least one part of the filtering material from a pressure wave from the ignition of the propergol charge.