Polarity-Independent DC Switching Device with Shared Arc Extinguishing Chamber
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Solution Overview
Problem
Existing switching devices for direct current applications are polarity-dependent and have a complex design due to the need for separate arc extinguishing devices for each current direction, leading to reduced lifetime and potential damage when operated in reverse current directions.
Innovation Solution
A compact switching device design where both arc extinguishing devices are arranged one behind the other, with a common arc guiding mechanism that directs arcs into a single extinguishing chamber, independent of current direction, using a magnetic field to drive arcs into the extinguishing chamber, and arc guiding arrangements to manage arc direction effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate arc extinguishing devices are provided for each current direction, then arcs can be extinguished in both current directions, but the device complexity increases and the dimensions become larger
Solution Approach 1:
The patent merges the arc extinguishing functionality for both current directions into a single shared extinguishing chamber. The arc extinguishing device includes a common chamber with magnetic field generation means that can direct arcs from either current direction into the same extinguishing region, eliminating the need for separate extinguishing devices for each polarity.
Solution Approach 2:
The arc extinguishing device is designed with universal functionality to handle arcs generated in both current directions. The magnetic field generation means can reverse polarity to create Lorenz forces that drive arcs from either direction into the shared extinguishing chamber, making the device applicable to both polarities without requiring separate specialized components.
2Reliability
If separate arc extinguishing devices are provided for each current direction, then arcs can be extinguished in both current directions, but the device dimensions increase
Solution Approach 1:
The patent merges the arc extinguishing functionality for both current directions into a single shared extinguishing chamber. The arc extinguishing device includes a common chamber with magnetic field generation means that can direct arcs from either current direction into the same extinguishing region, eliminating the need for separate extinguishing devices for each polarity.
Solution Approach 2:
The patent utilizes magnetic field direction control in the spatial dimension to route arcs from opposite current directions into the same physical chamber. By varying the magnetic field polarity, arcs are driven along different spatial paths that converge on the shared extinguishing region, effectively using dimensional routing to share the same physical space for both current directions.
3Adaptability or versatility
If the switching device is operated in opposite current direction with reversed magnetic poling, then the arc direction reverses, but arcs may run towards the switching bridge causing damage and reduced lifetime
Solution Approach 1:
The patent applies preliminary anti-action by providing magnetic field generation means that can detect or anticipate the current direction and adjust the magnetic field polarity accordingly. This pre-adjustment ensures that the Lorenz force always directs arcs away from the switching bridge and into the safe extinguishing chamber, preventing damage before it can occur regardless of current direction.
Solution Approach 2:
The patent implements dynamic magnetic field control where the polarity of the magnetic field can change based on the current direction. The magnetic field generation means is configured to reverse its magnetic poling when the current direction reverses, ensuring that the Lorenz force consistently drives arcs into the extinguishing chamber rather than towards the switching bridge, adapting in real-time to maintain protection.
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 allows for a compact, polarity-independent switching device with reduced dimensions and increased reliability by directing arcs into a single extinguishing chamber, eliminating the need for separate devices and enhancing the device's operational lifespan.
Implementation Method 1
a magnetic field that drives the arc into an arc extinguishing device has to be used in direct current applications. This magnetic field is built up by permanent magnets, whereby a magnetic field is built up with field lines in a direction which runs transverse to the separation sections and creates a Lorenz force on the arcs that form along these separation sections which drives an arc in the direction of an arc extinguishing device
Data Source
AI summary
A switching device includes at least a first current path and a second current path, each of which have a first connection and a second connection, whereby the first connections are arranged on the first side of the switching device and the second connections on the second side of the switching device, each current path has at least one contact pair, that has a first contact and a second contact, whereby at least the second contact is arranged on a contact member that is movable to the first contact and whereby in the switched-on status of the switching device, both the contacts are in contact with each other, each contact pair has at least one extinguishing device, whereby the extinguishing devices of both the current paths are arranged in a direction from the first connections to the second connections, behind one another and at least partly covering each other.