Rotating Fuse Shield Structure for Arc Discharge Isolation
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Solution Overview
Problem
In high-voltage protection elements, arc discharges generated when a fuse element fuses can cause dispersed metal to form new conductive paths or adhere to surrounding components, posing a risk of electrical hazards.
Innovation Solution
A protection element with a fuse element energized in one direction, featuring a shielding member made of insulating material with a plate-shaped part that rotates due to pressure elevation from an arc discharge, effectively isolating the cut or fused surfaces and interrupting the current path within a housing portion composed of insulating material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuse element is used to interrupt overcurrent, then current protection is achieved, but arc discharge generates dispersed metal that can form new conductive paths or adhere to surrounding components
Solution Approach 1:
The patent utilizes the harmful arc discharge pressure to drive the shielding member's rotational movement. The pressure generated by arc discharge, which was previously a harmful factor causing metal dispersion, is converted into a useful driving force that rotates the shielding member to block the arc discharge and suppress metal dispersion, thereby protecting surrounding components.
Solution Approach 2:
The shielding member acts as an intermediary element between the fuse element and surrounding components. When arc discharge occurs, the shielding member rotates to position itself between the fuse element and the surrounding environment, blocking the harmful effects of arc discharge and dispersed metal from reaching terminals and other components.
2Object-affected harmful factors
If the shielding member area is increased to improve arc suppression, then arc discharge suppression is enhanced, but the housing portion size increases
Solution Approach 1:
The shielding member is designed to be rotatable rather than stationary, allowing it to dynamically respond to arc discharge events. The shielding member rotates from an initial position to a blocking position when arc discharge occurs, providing effective arc suppression only when needed. This dynamic design allows for a more compact housing portion compared to a stationary shielding member that would need to maintain maximum blocking area at all times.
Solution Approach 2:
The shielding member utilizes rotational movement in a third dimension (rotational angle) to achieve arc suppression rather than relying solely on increasing the two-dimensional blocking area. By rotating into position, the shielding member effectively blocks the arc discharge path without requiring a large static footprint, thus reducing the housing portion size while maintaining effective arc suppression capability.
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 quickly suppresses arc discharges by rotating the shielding member to insulate the fuse element's surfaces, preventing the formation of new conductive paths and reducing the risk of electrical hazards, thereby ensuring safe and reliable operation.
Implementation Method 1
an arc discharge generated when the fuse element fuses causes the first surface to be pressed and the shielding member to rotate around the rotation axis
Implementation Method 2
pressure elevation in the housing portion due to an arc discharge
Data Source
AI summary
A protection element includes: a fuse element configured to be energized in a first direction, which is a direction from a first end portion of the fuse element to a second end portion of the fuse element; a shielding member including a plate-shaped part, configured to rotate around a rotation axis extending in a second direction orthogonal to the first direction, wherein the plate-shaped part viewed from the fuse element is divided to a first portion and a second portion at a contact position between the plate-shaped part and the rotation axis, and an area of the first portion and an area of the second portion are different from each other; and a case having therein a housing portion. Pressure elevation in the housing portion due to an arc discharge causes the shielding member to rotate around the rotation axis and the shielding member divides the housing portion.