Gas-Impermeable Sealer Element for Detonator Timing Reliability
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Solution Overview
Problem
Conventional pyrotechnic delay units face variations in functioning time and failure due to pressure fluctuations within detonators, necessitating improved sealing and ignition mechanisms to maintain precise timing and prevent gas leakage.
Innovation Solution
A gas-impermeable sealer element with a reactive material strip of alternating metals, such as aluminum and nickel, encapsulated in a non-reactive sleeve, which reacts exothermically to form a gas-impermeable residue, providing a straight reaction path and maintaining a constant volume environment to control pressure and prevent gas leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pyrotechnic delay units are used, then delay timing can be achieved, but pressure fluctuations cause variations in functioning time and reliability
Solution Approach 1:
A sealer element is introduced as an intermediary component between the delay train and the output charge. This sealer element maintains a constant volume environment that isolates the delay train from pressure fluctuations caused by charge compression, thereby ensuring reliable and consistent delay timing despite varying pressure conditions.
Solution Approach 2:
The sealer element creates an inert, constant-volume environment around the delay train by preventing gas leakage. This isolated environment protects the pyrotechnic delay materials from external pressure variations, maintaining stable burning conditions and consistent timing reliability.
2Reliability
If conventional sealing methods are used, then gas containment can be achieved, but gas leakage occurs due to pressure variations
Solution Approach 1:
The sealer element acts as an intermediary barrier that actively prevents gas leakage. It is positioned to seal the interface between the delay train and output charge, maintaining gas containment integrity even when pressure variations occur during detonator operation.
3Reliability
If ignition buffers are used, then ignition safety can be improved, but device complexity increases
Solution Approach 1:
The sealer element combines multiple functions into a single integrated component: it provides gas sealing to maintain constant volume, ensures reliable timing by isolating the delay train from pressure fluctuations, and maintains ignition safety. This merger eliminates the need for separate ignition buffer components, reducing overall device complexity while maintaining or improving reliability.
Solution Approach 2:
The sealer element is designed as a multi-functional component that simultaneously achieves gas containment, pressure isolation for timing stability, and ignition protection. This universal component replaces what would traditionally require multiple separate elements, simplifying the overall detonator structure.
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 minimizes delay time variations and ensures accurate burn time by maintaining a gas-tight seal, reducing gas leakage, and eliminating the need for ignition buffers, thus enhancing the reliability and precision of pyrotechnic delay systems.
Implementation Method 1
a reactive material which reacts along a reaction path to form a residual reaction product
Implementation Method 2
The reactive material comprises at least two different materials which, upon being energized, react with each other in an exothermic and self-sustaining reaction
Data Source
AI summary
A gas-impermeable sealer element (24, 124) for a detonator or other explosive initiation device includes a non-reactive sleeve (26, 126) having a channel (28, 128) formed therein. A reactive material strip (30, 130) is sealed within the channel for transmission of an explosive's initiation signal through the sealer element (24, 124), either alone or in cooperation with transfer charges located at the input and/or output end of the non-reactive sleeve (26, 126). The reactive material strip (30, 130) comprises a reactive metal wire or other substrate (34) having on one or both sides thereof a layer of reactive material (30, 130, 36), either reactive metal foils which react exothermically when ignited, or a deposited fuel-oxidizer reactive material. The reactive materials, upon being energized, react exothermically in the absence of atmospheric oxygen or other extraneous oxidizer and so may be encapsulated, sealed or otherwise isolated from the atmosphere in use.