Z-Shaped Movable Contact for Reliable Electrical Switching
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Solution Overview
Problem
The double contact electrical system requires complex mechanisms and large springs to ensure reliable contact between movable and static contacts, leading to increased manufacturing costs and complexity.
Innovation Solution
A simple electrical contact system with a rotatable member and a Z-shaped movable contact that slides between static contacts, utilizing convex contact points and a torsion spring for reliable contact, and a leaf spring for automatic reset, ensuring reliable and efficient switching with reduced complexity and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex mechanism and large spring are provided to ensure reliable electrical contact between movable and static contacts, then the reliability of electrical contact is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The movable contact is divided into two separate movable contacts, each independently contacting a static contact. This segmentation allows each contact pair to be simpler while maintaining overall reliability through redundancy
Solution Approach 2:
Instead of using a complex mechanism to force contact, the invention uses the natural elastic recovery of the movable contacts after rotation to ensure contact. The rotation direction is inverted relative to conventional designs, allowing the contacts to naturally settle into contact positions
2Reliability
If a complex mechanism and large spring are provided to ensure reliable electrical contact, then the reliability of electrical contact is improved, but the manufacturing cost increases
Solution Approach 1:
The contact system is segmented into independent contact pairs, each requiring minimal spring force. This reduces the size and cost of individual springs while maintaining reliability through the dual-contact configuration
Solution Approach 2:
The invention uses simpler, smaller springs that can be more easily manufactured and replaced if needed, rather than investing in a complex, expensive spring mechanism designed for long service life
3Reliability
If the movable contact is made to slide under the push of a static contact, then the reliable electrical contact is achieved, but the energy consumption increases
Solution Approach 1:
The movable contact transitions from a static position to a sliding motion dynamically during rotation. The sliding occurs only during the switching transient, not continuously, reducing energy consumption while ensuring contact reliability during the critical switching moment
Solution Approach 2:
The sliding action occurs periodically only during the switching operation rather than continuously. The elastic deformation and recovery of the movable contact during each switching cycle provides the necessary contact force without continuous energy input
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 system achieves reliable and efficient switching of electrical circuits with reduced manufacturing costs and complexity, improved arc extinguishing, and low energy consumption, while maintaining a compact design.
Implementation Method 1
a torsion spring configured to apply a contact pressure between the first convex contact point and the second convex contact point
Implementation Method 2
a leaf spring mounted on the rotatable member. The leaf spring is configured to automatically reset the movable contact to the initial position by its elastic reset force
Data Source
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AI summary
An electrical contact system includes: a pair of static contacts; a rotatable member provided between the pair of static contacts and rotatable about a rotation axis between a first position and a second position; and a movable contact mounted on the rotatable member to be rotated with the rotatable member. When the rotatable member is rotated to the first position, two ends of the movable contact electrically contact the pair of static contacts, respectively; when the rotatable member is rotated to the second position, two ends of the movable contact are separated from the pair of static contacts, respectively. The movable contact exhibits a Z-shape and slidably mounted on the rotatable member, allow the movable contact to slide, under pushing of a first static contact of the pair static contacts, toward a second static contact of the pair of static contacts and be in electrical contact with the second static contacts.