Spring-Electrode Fuse Structure for Arc-Free Overcurrent Interruption
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Solution Overview
Problem
Existing protection elements for high voltage and current face challenges in preventing arc discharge during fuse element interruption, with complications in manufacturing, miniaturization, and long-term stability concerns, particularly in arc-extinguishing material and spring-based designs.
Innovation Solution
A protection element design featuring a first and second electrode with spring properties, supporting a fuse element material in a bent state, where the electrodes apply shearing forces to cut the fuse element, utilizing a laminate structure with high and low melting point metals to ensure quick arc discharge prevention while maintaining long-term stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If arc-extinguishing material is packed around the fuse element, then arc discharge is prevented, but manufacturing process becomes complicated and miniaturization is difficult
Solution Approach 1:
The invention extracts the arc-extinguishing material from the traditional packaging approach and replaces it with a spring mechanism that physically separates the fuse element from the electrodes. This eliminates the need for complex arc-extinguishing material packaging while still preventing arc discharge through mechanical separation.
Solution Approach 2:
The spring acts as an intermediary mechanism between the fuse element and the electrodes. When the fuse element melts, the spring mediates the separation process by using its elastic restoring force to quickly move the fuse element away from the electrodes, thereby preventing arc discharge without requiring arc-extinguishing material.
2Speed
If spring is used to separate fuse element and electrode, then arc discharge is quickly stopped, but joining strength decreases with time
Solution Approach 1:
The spring is pre-loaded with elastic potential energy during assembly, storing the force needed for rapid separation. This preliminary action ensures that when the fuse element melts, the separation occurs immediately without delay, achieving quick arc discharge interruption while maintaining consistent joining strength over time.
Solution Approach 2:
The invention introduces dynamic behavior through the spring mechanism, which remains inactive during normal operation but activates rapidly when needed. The spring's elastic properties allow it to provide controlled, repeatable separation forces that maintain joining strength stability while enabling fast arc discharge interruption when the fuse element fails.
3Reliability
If fuse element is supported in bent state by spring electrodes, then long-term stability is maintained, but manufacturing precision is required
Solution Approach 1:
The invention changes the physical state of the spring electrodes from rigid to elastically deformable, allowing them to be bent into the required position during assembly. This parameter change enables the spring to maintain the fuse element in a bent state with adequate tolerance, reducing manufacturing precision requirements while ensuring long-term stability through the spring's elastic recovery.
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 arc discharge during overcurrent interruption by utilizing the elastic restoring force of the spring electrodes, ensuring quick interruption and reducing the risk of arc discharge, while maintaining long-term stability and ease of manufacturing.
Implementation Method 1
a second electrode 2 having a spring property, and a fuse element material 3 disposed between the first electrode 1 and the second electrode 2, in which the fuse element material 3 is supported by being interposed between the first electrode 1 and the second electrode 2 in a bent state
Implementation Method 2
a shearing force that is configured to cause the fuse element material to be sheared when an overcurrent flow may be applied to the fuse element material from the first electrode 1 and the second electrode 2
Implementation Method 3
a heat generating body that is configured to heat the fuse element material and a third electrode 80 that is configured to supply a current to the heat generating body 70
Data Source
AI summary
A protection element includes a first electrode (1), a second electrode (2) having a spring property, and a fuse element material (3) that is disposed between the first electrode and the second electrode, in which the fuse element material (3) is supported by being interposed between the first electrode (1) and the second electrode (2) in a bent state.