Adjustable Electromagnetic Release with Torsion Spring Mechanism
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Solution Overview
Problem
Existing electromagnetic releases for circuit breakers have low accuracy and require large adjusting forces due to the dual variables in air gap adjustment, which can lead to damage and inability to achieve the required release rate.
Innovation Solution
An adjustable electromagnetic release with a single variable adjustment mechanism, utilizing a torsion spring and adjusting screw to control the air gap between the armature and magnetic yoke, allowing for precise adjustment with a small reaction spring force and minimal adjusting force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the air gap is adjusted by stretching the reaction spring, then the initial attraction force is enlarged, but the initial reaction force also enlarges and the adjustment accuracy deteriorates
Solution Approach 1:
The patent divides the adjustment function into two independent parts: the air gap adjustment mechanism and the reaction force control mechanism. The air gap is adjusted by rotating the adjusting screw which moves the armature, while the reaction force is controlled by the pre-compressed reaction spring. This segmentation allows independent optimization of each parameter without mutual interference, resolving the contradiction between attraction force and adjustment accuracy.
Solution Approach 2:
The patent extracts the reaction force control function from the air gap adjustment process. By using a separate reaction spring that is pre-compressed to a predetermined extent, the reaction force is determined independently of the air gap adjustment. This extraction allows the air gap to be adjusted precisely without being constrained by reaction force variations.
2Adaptability or versatility
If the air gap is adjusted, then the release rate can be adjusted, but the required adjusting force becomes very large due to the reaction spring force
Solution Approach 1:
The reaction spring is pre-compressed to a predetermined extent before the armature is adjusted. This preliminary action stores the necessary reaction force in advance, so that when the armature is rotated to adjust the air gap, the adjusting force only needs to overcome friction and minor mechanical resistance, not the full reaction spring force. This makes the adjustment operation easy while maintaining the required release rate adjustment capability.
Solution Approach 2:
The pre-compressed reaction spring acts as a counterweight mechanism, providing a balanced force that offsets the adjusting force requirement. The spring is compressed to a level that provides the necessary reaction force without creating excessive resistance during adjustment, effectively balancing the forces involved in the adjustment process.
3Adaptability or versatility
If the adjusting force is applied to stretch the reaction spring, then the air gap can be adjusted, but the adjusting components may be damaged due to insufficient material strength
Solution Approach 1:
The reaction spring is pre-compressed to the required extent during assembly, before any adjustment operations are performed. This preliminary action ensures that the spring is already at the optimal compression level, eliminating the need to apply large adjusting forces during operation. The adjusting components only need to handle minimal forces, well within their strength limits, while still providing full adjustability.
Solution Approach 2:
The adjusting screw acts as an intermediary mechanism that translates small rotational movements into precise linear adjustments of the armature position. This mechanical advantage allows the adjusting components to operate with minimal force while achieving the required adjustment range, preventing material damage while maintaining adjustability.
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 provides improved accuracy and reduced risk of damage by allowing precise adjustment of the electromagnetic release rate with a small reaction spring force and minimal adjusting force, enhancing the reliability and usability of circuit breakers.
Implementation Method 1
a torsion spring surrounded on the shaft, the torsion spring is positioned within the adjusting mechanism. One pin of the torsion spring is connected to the armature
Implementation Method 2
When large current passes through the conductor, the armature and the magnetic yoke attract each other under the electromagnetic force
Data Source
AI summary
An apparatus having a conductor passing through a magnetic yoke and is mounted on the bracket, in which the magnetic yoke is fixed on the bracket as well. Above the conductor, a shaft is mounted on the top of the bracket. A push rod is mounted on the shaft and rotates with the shaft about the bracket. An armature, spaced apart from the magnetic yoke, is fixed on the push rod. Adjusting mechanisms are mounted on both sides of the shaft between the push rod and the bracket. Within the adjusting mechanism, a torsion spring is around the shaft. An adjusting rod is provided with a plurality of adjusting surfaces which makes contact with the adjusting mechanism. A spring force of the torsion spring enables the push rod to rotate towards a direction which makes the armature and the magnetic yoke separate.