Arc Guide Plate Segmentation for Switching Device
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Solution Overview
Problem
Existing switching devices face challenges in reliably extinguishing switching arcs within structural constraints, particularly when the outlet opening of the arc quenching chamber is smaller than the distance between arc guide plates, leading to difficulties in bending thick arc guide plates and potential plasma concentrations.
Innovation Solution
The switching device features an arc quenching chamber with an outlet opening that allows the switching arc to be blown away by a magnetic blowout field, using an arc guide plate that extends from the contact point to the outlet opening and an arc guide pin that shortens the arc before it exits, preventing plasma concentrations and allowing for simpler production of thick arc guide plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the arc guide plate is bent in steps to accommodate a smaller outlet opening, then the switching arc can be contained within the switching device, but the bending process becomes difficult for thick arc guide plates and requires large bending radii and high bending tolerances
Solution Approach 1:
The arc guide plate is divided into multiple linear sections (first section, second section, third section) connected by joints, allowing the plate to achieve a stepped configuration through simple linear segments rather than continuous bending. This segmentation enables easy assembly and disassembly while maintaining the arc-containing function.
Solution Approach 2:
The arc guide plate transitions from a two-dimensional bent plate to a three-dimensional articulated structure with multiple sections that can be assembled in sequence. This dimensional transformation allows the plate to adapt to the outlet opening geometry without requiring complex bending operations on thick materials.
2Volume of moving object
If the outlet opening clear passage dimension is reduced, then the switching device size is minimized, but the switching arc cannot be adequately stretched before exiting the chamber
Solution Approach 1:
The arc guide plate performs preliminary arc stretching within the arc quenching chamber before the arc reaches the outlet opening. By pre-stretching the arc along the extended path defined by the multiple sections, the plate ensures adequate arc length and distribution before exit, maintaining extinguishing reliability despite the small outlet opening dimensions.
Solution Approach 2:
The arc guide plate acts as an intermediary structure that mediates between the limited outlet opening space and the requirement for adequate arc stretching. The extended path provided by the multi-section plate allows the arc to be gradually stretched and controlled throughout the chamber, bridging the gap between compact size and effective arc management.
3Strength
If the arc guide plate is made thick for high-performance switching devices, then the mechanical strength is improved, but the bending process becomes more difficult and requires higher precision
Solution Approach 1:
The thick arc guide plate is segmented into multiple linear sections that can be manufactured with standard precision and then assembled. This avoids the need to bend thick plates with large radii and high tolerances, as each section can be fabricated more easily and joined together to form the complete stepped structure.
Solution Approach 2:
The design eliminates the need for large bending radii by replacing continuous curved bends with straight linear sections connected at joints. This allows thick plates to be used for strength without requiring precision bending operations, as the linear sections can be cut and assembled with standard manufacturing tolerances.
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
This solution enables rapid and reliable extinguishing of switching arcs, allows for the arc guide plate to be led out of the housing without a stepped profile, and prevents plasma concentrations, making it suitable for thick arc guide plates with a simple and cost-effective design.
Implementation Method 1
an arc blowing device assigned to the contact point, which is provided for generating a magnetic blowout field, through which the switching arc that occurs when the contact point is opened is blown away from the contact point
Data Source
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AI summary
The present invention relates to a switching device with at least one contact point, an arc quenching chamber associated with the contact point, and an arc blowing device associated with the contact point. The arc quenching chamber has an outlet opening through which plasma, generated by a switching arc occurring within the switching device when the contact point opens, can exit the switching device. The outlet opening has a clear diameter and defines an outlet plane. The arc blowing device is designed to generate a magnetic blowing field by which the switching arc generated when the contact point opens is blown away from the contact point towards the outlet opening.The switching device further comprises at least one first arc guide plate extending from the contact point to the exit opening, through which the switching arc is guided and stretched on its way from the contact point to the exit opening, wherein the first arc guide plate has a first section and a second section between the contact point and the exit plane within the arc quenching chamber, wherein the first section of the first arc guide plate is arranged proximal to the contact point, and the second section of the first arc guide plate is arranged distal to the contact point.According to the invention, the second section of the first arc guide plate extends beyond the exit opening in a direction parallel to the exit plane, so that the switching arc is extended beyond the clear passage dimension of the exit opening at least at one end of the switching arc by the second section of the first arc guide plate, wherein an arc guide pin projecting from the second section of the first arc guide plate is arranged in front of the exit opening, by which the switching arc is shortened again in front of the exit opening.