Switch Quenching Chamber Magnetic Arc Control
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Solution Overview
Problem
Electrical switches with direct current operation face challenges in extinguishing arcs reliably across both current directions, leading to reduced service life due to prolonged arc duration and potential polarity-related installation errors, especially in multi-pole configurations.
Innovation Solution
A switch design featuring a magnetic field with a fixed direction and additional quenching devices arranged opposite each other to handle both current directions, ensuring rapid arc extinction, with a symmetrical and cost-effective construction using permanent magnets and arcing chambers or cooling plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single quenching device is used in each switching chamber, then the structure is simple, but the arc cannot be reliably extinguished in both current directions
Solution Approach 1:
The patent applies asymmetry by arranging quenching devices asymmetrically relative to the magnetic field direction. The magnetic field is generated in a fixed direction by permanent magnets, while quenching devices are positioned to effectively quench arcs in both current directions through this asymmetric configuration, resolving the contradiction between simple structure and reliable bidirectional arc extinguishing.
Solution Approach 2:
The patent uses the inversion principle by leveraging the fixed-direction magnetic field to create symmetric arc quenching效果 for bidirectional currents. Instead of providing symmetric quenching devices for each direction, the fixed magnetic field combined with strategically positioned quenching devices achieves equivalent quenching effectiveness in both directions, simplifying the overall structure while maintaining reliability.
2Ease of operation
If polarity-dependent quenching is used, then fewer quenching devices are needed, but installation errors occur due to polarity sensitivity
Solution Approach 1:
The patent achieves universality by designing a quenching system that functions effectively for both current directions using a fixed-direction magnetic field and strategically positioned quenching devices. This universal design eliminates polarity sensitivity, allowing the switch to be installed without concern for current direction, thereby improving ease of operation while maintaining reliability.
3Duration of action of stationary object
If arc extinction time is prolonged, then fewer quenching measures are needed, but contact erosion and thermal load increase
Solution Approach 1:
The patent applies preliminary action by positioning quenching devices and configuring the magnetic field to immediately drive the arc into quenching chambers as soon as the contacts separate. This preliminary quenching action significantly reduces arc duration, thereby minimizing contact erosion and thermal load on the switching chamber.
Solution Approach 2:
The patent uses the skipping principle by rapidly driving the arc through the switching chamber into the quenching chambers using the magnetic field force. This rushed arc extinction process minimizes the time the arc spends eroding contacts and heating the switching chamber, effectively reducing harmful effects.
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 reliable, polarity-independent arc quenching across both current directions, preventing installation errors and extending the service life of the switch by ensuring quick arc extinction, regardless of current direction, thus maintaining switch performance and reducing thermal load.
Implementation Method 1
a magnetic field with a fixed direction and additional quenching devices arranged opposite one another to handle both current directions
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
The invention relates to a switch having a fast quenching behavior for electric arcs irrespective of the respective polarity and being suitable for multi-pole operation. The switch comprises at least two switching chambers (11a, 11b) having two-way switches with two separate immobile contacts (2) each, said contacts having respective first contact regions (21, 22), a mobile electrically conducting contact piece (30) having two second contact regions (31, 32) for establishing respective electrically conductive connections between the first and second contact regions (21, 22, 31, 32) in the ON state of the switch (1) and for interrupting the first and second contact regions (21, 22, 31, 32) in the OFF state of the switch (1) and at least two quenching devices (41, 42, 43) for quenching electric arcs (5) that may occur between the first and second contact regions (21, 22, 31, 32) when the OFF state is established. The switch further comprises at least two magnets (71, 72) for producing a magnetic field (M) at least in the region of the first and second contact regions (21, 22, 31, 32) of the switching chambers (11a, 11b) to exert a magnetic force (F) onto the electric arcs (5) such that at least one of the electric arcs (5) is driven towards one of the quenching devices (41, 42, 43) irrespective of the current direction (I) in the electric arc (5), the contact pieces (30) of the switching chambers (11a, 11b) being arranged such that the second contact regions (32, 32) are located in a line substantially at a right angle to the direction of movement (T) of the electric arcs (5).