Chemical Trigger Dual-Element Fuse for Time-Delay Overcurrent Protection
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Solution Overview
Problem
Conventional dual-element time-delay fuses with mechanical trigger devices face manufacturing challenges due to complexity and high component count, leading to increased costs and reliability issues, as well as the need for design adjustments for different current ratings.
Innovation Solution
A chemically activated dual-element electrical fuse with a trigger element that includes a freestanding planar sheet metal element overlaid with low-melting-point metal, which melts and diffuses into the high-melting-point metal to lower the melting temperature, allowing for a time-delayed circuit interruption without the need for mechanical parts or adjustments for each current rating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical trigger device is used in dual-element time-delay fuses, then overcurrent protection and selective coordination are achieved, but manufacturing complexity and component count increase
Solution Approach 1:
The patent extracts the complex mechanical trigger device from the fuse structure and replaces it with a simple chemical trigger element. The chemical trigger element consists of a fusible link and a trigger wire, eliminating the need for mechanical components such as springs, levers, and adjustment mechanisms. This extraction maintains the overcurrent protection function while dramatically reducing device complexity.
Solution Approach 2:
The patent substitutes the mechanical trigger system with a chemical trigger system. Instead of using mechanical components that require precise assembly and adjustment, the invention uses a chemical reaction (melting of the fusible link) to activate the trigger wire, which then breaks the circuit. This substitution eliminates mechanical complexity while maintaining the time-delay overcurrent protection function.
2Duration of action of moving object
If mechanical trigger devices are used, then time-delay functionality is achieved, but manufacturing cost and assembly difficulty increase
Solution Approach 1:
The patent changes the trigger mechanism from mechanical to chemical by utilizing the melting point parameter of the fusible link material. The fusible link is designed with specific melting characteristics that provide the desired time-delay function. By changing the material parameter (melting point) rather than using mechanical timing mechanisms, the invention achieves time-delay functionality while greatly simplifying manufacturing.
Solution Approach 2:
The chemical trigger element is designed as a simple, inexpensive component that is replaced rather than adjusted. The fusible link and trigger wire are basic materials that can be easily manufactured and assembled, eliminating the need for complex mechanical parts that require precision manufacturing and assembly. This approach reduces both manufacturing cost and assembly difficulty.
3Reliability
If conventional mechanical triggers are used, then circuit interruption is achieved, but component count and assembly steps increase
Solution Approach 1:
The patent merges the fusible link and trigger wire into a single integrated chemical trigger element assembly. Instead of having separate mechanical components for high-current interruption and low-current time-delay interruption, the invention combines these functions into one chemical trigger system. The fusible link handles high-current interruption while the same chemical trigger mechanism handles low-current time-delay interruption, reducing the total component count.
Solution Approach 2:
The chemical trigger element serves multiple functions: it provides both high-current interruption (through the fusible link) and low-current time-delay interruption (through the trigger wire). This universal trigger mechanism eliminates the need for separate mechanical trigger devices for different current levels, reducing component count while maintaining comprehensive overcurrent protection.
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 simplifies the manufacturing process, reduces component count, and maintains effective overcurrent protection across a range of current ratings, meeting performance standards without the need for redesigning the trigger element for different current ratings.
Implementation Method 1
low-melting-point metal, which melts and diffuses into the high-melting-point metal to lower the melting temperature
Implementation Method 2
low-melting-point metal, which melts and diffuses into the high-melting-point metal to lower the melting temperature
Data Source
AI summary
An electrical fuse is provided. The electrical fuse includes a short circuit fusible element and a trigger element connected in series with the short circuit fusible element. The trigger element is chemically activated rather than mechanically activated to interrupt a predefined overload condition with a predetermined time delay.