Diagonal Fusible Link in Rectangular Fuse Body
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Solution Overview
Problem
Fuses designed for high voltage and current ranges often suffer from damage to the insulating body and hot sand or arcing issues during overloads or short circuits, particularly due to the formation of a sintered body that can cause stress cracks and further damage.
Innovation Solution
A fuse with a receiving area of rectangular or square cross-section, where fusible conductors are arranged diagonally, providing increased space for the sintered body to form and reducing proximity to the insulating body's corners, thus minimizing stress on the insulating material and preventing arcing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If fusible conductors are arranged close to the insulating body to minimize fuse dimensions, then the fuse size is reduced, but stress cracks and hot sand ejection occur due to sintered body expansion
Solution Approach 1:
The patent applies asymmetry by using a rectangular receiving area instead of a circular one, creating corner areas that provide asymmetric space for sintered body expansion. This asymmetric geometry allows the sintered body to expand into the corners without contacting the insulating body walls, preventing stress cracks while maintaining compact dimensions.
Solution Approach 2:
The patent utilizes the diagonal plane arrangement of fusible conductors within the rectangular receiving area to optimize space utilization. By arranging conductors diagonally and utilizing the corner areas in the cross-sectional dimension, the design creates additional space for sintered body expansion without increasing the overall fuse volume.
2Reliability
If receiving area is enlarged to increase distance between fusible conductor and insulating body wall, then insulating body damage is avoided, but fuse dimensions increase
Solution Approach 1:
The rectangular receiving area with corner areas provides asymmetric space that increases the effective distance between fusible conductors and insulating body walls without requiring a proportional increase in overall fuse dimensions. The corner areas act as expansion zones that protect the insulating body while maintaining compact size.
Solution Approach 2:
By utilizing the diagonal arrangement and corner areas in the cross-sectional dimension, the patent creates additional space for sintered body expansion without increasing the fuse length or overall volume proportionally.
3Ease of manufacture
If fusible conductors are arranged in a round recess, then manufacturing is simplified, but corner areas are wasted and space for sintered body expansion is limited
Solution Approach 1:
The patent transitions from a symmetric circular recess to an asymmetric rectangular receiving area with corner areas. This change utilizes the full available space more efficiently, providing additional volume for sintered body expansion while maintaining manufacturability through standard molding processes.
Solution Approach 2:
The rectangular cross-section with corner areas utilizes the diagonal dimension more effectively, creating additional space for sintered body expansion that is not available in circular designs. This geometric change optimizes space utilization without complicating manufacturing.
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 diagonal arrangement of fusible conductors in a rectangular or square receiving area effectively reduces the risk of insulating body damage by providing more space for the sintered body to expand, maintaining the integrity of the fuse and preventing arcing, while maintaining a compact design.
Implementation Method 1
Due to the prevailing temperatures in the area of the arc, a non-conductive, fulgurite-like sintered body develops from the quartz sand encasing the fusible conductor.
Implementation Method 2
at least one fusible conductor arranged inside the fuse melts when a load is applied above a predetermined time/current range, in order ultimately to disconnect the circuit.
Implementation Method 3
A switching arc usually occurs at the point of disconnection, the extent and duration of which depend on the characteristics of the circuit in terms of voltage, current intensity, the time constant of the fault circuit and the presence of AC or DC voltage.
Data Source
Figure 1~3
Figure 4~5
Figure 6
AI summary
The invention relates to a fuse (1), preferably a low-voltage fuse, preferably designed for use in a rated voltage range of greater than or equal to 900 V and/or a rated current range of greater than or equal to 250 A, particularly for use in DC circuits, comprising an insulating body (2) and at least one strip-shaped fusible link (3), wherein the insulating body (2) has a receiving area (4) for receiving the fusible link (3). According to the invention, the receiving area (4) has a cross-section perpendicular to its longitudinal axis that is at least substantially rectangular or rectangular in shape with diagonals extending between the corner areas (5), and the fusible link (3) is arranged at least substantially in a diagonal plane of the receiving area (4).