V-Profile Movable Contact Arc Quenching
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Solution Overview
Problem
Existing electric current switching apparatuses face challenges in ease of assembly, versatility in switch types, safety during use, fast contact connection/disconnection, and efficient arc quenching, especially when handling high currents.
Innovation Solution
The design incorporates a switch module with angled stationary contacts and a movable contact that forms a V-profile current path, utilizing a rotary actuator and quenching plates to manage high currents and arc quenching, allowing for efficient switching and reduced wear on contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional straight contact configuration is used, then assembly is simple, but arc quenching efficiency is poor and contact wear is high
Solution Approach 1:
The patent applies asymmetry by configuring the stationary contact and movable contact at angles to each other, forming a V-shaped current path rather than a straight line. This asymmetric arrangement improves arc quenching efficiency by directing the arc into the quenching chamber at an optimal angle, while the angular configuration reduces contact wear through better force distribution.
Solution Approach 2:
The patent transitions from a one-dimensional straight contact path to a two-dimensional angular V-shaped current path. The stationary contact and movable contact are arranged at specific angles (e.g., 45 degrees each) to form a V-profile, adding spatial dimensionality to the current path. This dimensional change enables more effective arc control and quenching while maintaining assembly feasibility.
2Reliability
If contact pressure is increased to reduce contact resistance, then current handling capability improves, but contact wear increases and assembly difficulty increases
Solution Approach 1:
The patent incorporates preliminary action by pre-configuring the angular orientation of contacts and pre-positioning quenching plates before operation. The stationary contact is fixed at a predetermined angle, and the movable contact is designed with built-in angular positioning features, eliminating the need for complex alignment procedures during assembly and ensuring optimal contact pressure distribution from the start.
Solution Approach 2:
The patent introduces an intermediary element in the form of angular contact surfaces and quenching plates that mediate between the electrical contact function and mechanical assembly requirements. The angled configuration acts as an intermediary that distributes contact forces more evenly, reducing peak pressures and wear while maintaining low contact resistance.
3Reliability
If switch design is optimized for high current handling, then short-circuit current management improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies segmentation by dividing the contact system into distinct angular components (stationary contact at one angle, movable contact at another angle) and separating the quenching function into dedicated quenching plates. This segmentation allows each component to be manufactured independently using standard processes, then assembled together, reducing overall manufacturing difficulty while achieving superior short-circuit current management.
Solution Approach 2:
The patent utilizes parameter changes by optimizing the angular parameters of the contact configuration (e.g., 45-degree angles) and the geometry of quenching plates. These specific parameter values are chosen to balance performance requirements for high current handling with manufacturing feasibility, allowing standard fabrication methods to produce the optimized geometry without excessive complexity.
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 enhances the ease of assembly, improves safety by providing clear indications of the switch's state, and effectively manages high short-circuit currents by minimizing contact resistance and efficiently quenching arcs, thus ensuring reliable operation.
Implementation Method 1
efficient quenching of an arc firing when the contacts are separated
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention relates to a movable contact for an electric switch, comprising a first contact blade (131) and a second contact blade (132). Each of the first contact blade (131) and the second contact blade (132) comprises an assembly hole (132A), the movable contact comprising an assembly pin (138) wherein the assembly pin (138) comprises a separation portion (138A) having a diameter greater than the assembly holes (132A) of the first (131) and second (132) contact blades thereby keeping the first (131) and second (132) contact blades separated from each other, the assembly pin (138) comprising a contact blade portion (138B, 138C) on each side of the separation portion (138A) for insertion to the assembly holes (132A) of the contact blades (131, 132).