Fuse Chamber Geometry for Blast and Debris Attenuation
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Solution Overview
Problem
Melamine fuses lack a mechanism to effectively control the blast path during an overcurrent event, which can lead to uncontrolled debris movement and potential electrical conductivity, failing to prevent damage to circuitry components.
Innovation Solution
Incorporating special layers with geometric elements into the fuse design, which divide the chamber holding the fusible element into sub-chambers, providing pathways for debris movement and attenuating shock strength through geometric blockages, thereby reducing the likelihood of electrical conductivity post-fuse breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If melamine layers are stacked without filler material, then the fuse acts very fast, but the shock blast and debris are not controlled, potentially causing electrical conductivity and damage to circuitry
Solution Approach 1:
The fuse body is segmented into multiple stacked layers with intermediate layers containing geometric elements that divide the internal chamber into sub-chambers. This segmentation controls the blast path and debris movement while maintaining the fast-acting characteristic of melamine fuses.
Solution Approach 2:
Intermediate layers with geometric elements serve as mediators between the fusible element and the external environment. These layers attenuate the shock wave and control debris ejection without significantly slowing the fuse's response time.
2Object-affected harmful factors
If filler material like sand is added to prevent fire and sparks, then the harmful factors are controlled, but the fuse structure becomes more complex and may affect its fast-acting performance
Solution Approach 1:
The intermediate layers incorporate geometric elements that create a porous or latticed structure within the chamber. This structure provides blast attenuation and debris control functionality similar to filler materials, but without adding significant structural complexity or compromising the fast-acting performance.
3Stress or pressure
If the chamber is divided into sub-chambers with geometric elements, then the shock wave intensity is reduced, but the device complexity increases
Solution Approach 1:
The chamber is segmented into sub-chambers using intermediate layers with geometric elements. This segmentation reduces shock wave intensity by distributing and attenuating the blast energy across multiple smaller volumes, while the modular layer design keeps the overall structure manageable.
Solution Approach 2:
The geometric elements in the intermediate layers introduce additional dimensional complexity (patterns, shapes, configurations) within the layers themselves, allowing for effective blast attenuation without significantly increasing the overall number of layers or fuse length.
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 special layers effectively manage the explosive blast, reducing shock wave intensity and preventing the formation of conductive debris paths, ensuring the fuse's intended purpose is met by preventing damage to other components.
Implementation Method 1
The geometric elements provide a pathway between the first sub-chamber and the second sub-chamber... attenuating shock strength through geometric blockages
Data Source
AI summary
A fuse includes multiple stacked layers, a first terminal, and a second terminal. The first terminal is connected to one end of a fusible element and the second terminal is connected to the other end. The stacked layers include first and second intermediate layers and a special layer. The first intermediate layer, which has a centrally disposed opening, is stacked on the first terminal and the second terminal. The second intermediate layer, also having a centrally disposed opening is stacked above the first intermediate layer, and the centrally disposed openings define a chamber above the fusible element. The special layer is located between the first intermediate layer and the second intermediate layer and includes one or more geometric elements. The geometric elements divide the chamber into two sub-chambers, the first sub-chamber being above the second sub-chamber.