Pyrotechnic Object Over-Ignition Opening Sealing Mechanism
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Solution Overview
Problem
In pyrotechnic objects with multiple effect charges, pressure surges from igniting preceding charges can lead to malfunctions, such as incorrect or failed ignitions, due to uncontrolled pressure and thermal effects on the delay charge, resulting in potential unexploded dangerous charges or skewed combustion fronts.
Innovation Solution
Introducing an over-ignition charge that differs chemically from the effect charge into the over-ignition opening, which combusts to form slag that partially seals the opening, reducing pressure shock propagation and ensuring reliable ignition by guiding the combustion front and anchoring the combustion residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple effect charges are ignited sequentially using a delay charge in the delay chamber, then the pyrotechnic object can produce multiple effects one after another, but pressure surges from igniting preceding charges can cause malfunctions such as incorrect or failed ignitions of subsequent charges
Solution Approach 1:
The patent divides the delay charge into multiple separate delay charges, each housed in its own delay chamber. Each delay charge is responsible for igniting a specific effect charge in sequence. This segmentation isolates the pressure surge effects, preventing them from interfering with the ignition of subsequent effect charges, thereby maintaining both the multiple effects capability and the ignition reliability.
Solution Approach 2:
The patent introduces a sealing element as an intermediary component between the delay charge and the effect charge. This sealing element is designed to be pushed by the pressure surge from an ignited effect charge to seal the over-ignition opening, preventing the pressure surge from interfering with the ignition of subsequent effect charges. The sealing element acts as a mediator that protects the ignition system from pressure-related malfunctions.
2Reliability
If the over-ignition opening remains open to allow combustion front propagation, then effect charges can be ignited reliably, but pressure shocks can propagate back to the delay chamber causing uncontrolled multiple ignitions or skewed combustion fronts
Solution Approach 1:
The patent employs a sealing element that is pre-positioned in a state where it can be quickly activated by the pressure surge from an ignited effect charge. When the pressure surge occurs, the sealing element is pushed to seal the over-ignition opening, preventing pressure shock propagation. This preliminary positioning of the sealing element ensures rapid response to pressure surges while maintaining ignition reliability.
Solution Approach 2:
The patent converts the harmful pressure surge into a beneficial sealing action. The pressure surge that would normally cause malfunctions is instead utilized to push the sealing element into position, sealing the over-ignition opening. This converts the harmful pressure shock into a useful sealing mechanism that prevents uncontrolled multiple ignitions and skewed combustion fronts.
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 solution enhances the reliability and safety of igniting effect charges by reducing pressure shock effects on the delay chamber, ensuring consistent ignition and preventing uncontrolled multiple ignitions or incomplete combustion.
Implementation Method 1
an over-ignition charge that differs and chemically deviates from the respective effect charge is introduced into the over-ignition opening or into the plurality of over-ignition openings, in order to at least partially close the over-ignition opening after its combustion and by its combustion residue
Data Source
AI summary
The present disclosure relates to a pyrotechnic object, in particular an irritation body, irritation projectile or ammunition, comprising an ignition device, comprising a delay chamber extending along a delay path, in which chamber a delay charge is accommodated, and comprising at least one and preferably a plurality of effect chambers in which or in each of which an effect charge to be ignited is accommodated, wherein the delay chamber is transversely connected to a respective effect chamber via a respective over-ignition opening which branches off from the delay chamber and forms an over-ignition path, wherein in the case of a plurality of effect chambers the plurality of over-ignition openings are arranged successively downstream along the delay path in the order of the effect charges to be ignited.