Multilayer Wire Cloth Venting for Arc Gas Cooling and Filtration
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Solution Overview
Problem
Existing switching devices fail to effectively cool and filter outflowing gases from arc extinguishing chambers, leading to potential ignition and explosive combustion outside the device, which can damage the device and surrounding components.
Innovation Solution
A multilayer wire cloth or fabric is used in the orifice of the switching device, with alternating weave directions and increasing fineness towards the outside, to change the gas flow direction and provide effective cooling and filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer wire cloth or fabric is used in the orifice, then the structure is simple and easy to manufacture, but the cooling and filtration efficiency is insufficient, leading to potential ignition and explosive combustion outside the device
Solution Approach 1:
The single-layer wire cloth is divided into multiple layers (at least two layers) with different orientations. Each layer provides partial cooling and filtration, and the combination of multiple layers enhances the overall effectiveness without requiring each individual layer to be overly complex.
Solution Approach 2:
The wire cloth layers are arranged with different orientations (e.g., first layer at 0° to the horizontal plane, second layer at an angle between 10°-80°). This angular arrangement adds a dimensional aspect to the filtration and cooling process, allowing gases to be filtered and cooled from multiple directional perspectives, thereby improving reliability without excessive complexity.
2Reliability
If the wire cloth layers are arranged with the same orientation, then the manufacturing and installation is easier, but the cooling efficiency is reduced and gases can bypass the filtration structure
Solution Approach 1:
The wire cloth system is segmented into multiple layers with distinct orientations. This segmentation ensures that gases cannot easily bypass the filtration structure, as each layer presents a different angular barrier. The segmented approach improves cooling and filtration efficiency while maintaining reasonable manufacturability through standardized layer assembly.
3Object-affected harmful factors
If no filtration structure is used in the orifice, then the device is simpler and gas flow is unrestricted, but breaking gases can ignite and cause explosive combustion outside the housing
Solution Approach 1:
The wire cloth layers act as an intermediary structure between the arc extinguishing chamber and the external environment. This intermediary provides both cooling and filtration functions, preventing hot breaking gases and particles from directly escaping and causing ignition or explosive combustion outside the housing.
Solution Approach 2:
The filtration and cooling system uses composite construction with multiple wire cloth layers of different orientations. This composite structure achieves superior performance in preventing harmful effects compared to a single material or structure, while maintaining a level of complexity that is manageable in terms of manufacturing and installation.
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
Prevents ignition and explosive combustion of outflowing gases, ensuring the safety and integrity of the switching device and surrounding components by enhancing cooling and filtration efficiency.
Implementation Method 1
A multilayer wire cloth or (knitted) fabric is used in the orifice of the switching device... to perform cooling of breaking gases
Implementation Method 2
The at least first and the second wire layer are disposed in a stacked configuration in the orifice in a way that the cloth or fabric structure of the at least second wire layer is oriented in another direction than the cloth or fabric structure of the at least first wire layer... to change the gas flow direction and provide effective cooling
Implementation Method 3
A multilayer wire cloth or (knitted) fabric comprising at least a first wire layer and at least a second wire layer... to perform cooling of breaking gases... The multilayer wire cloth or fabric is disposed in the orifice with a defined orientation... to change the gas flow direction
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A switching device (1) with effective cooling of outflowing gases comprises an arc extinguishing chamber (10), an orifice (20) for the outflow of the gases from the arc extinguishing chamber (10), and a multilayer wire cloth/fabric (100). The multilayer wire cloth/fabric (100) comprises at least a first wire layer (110) and at least a second wire layer (120), the at least first wire layer (110) and the at least second wire layer (120) having a respective cloth/fabric structure, wherein the at least first wire layer (110) and the at least second wire layer (120) are disposed in a stacked configuration in the orifice (20) in a way that the cloth/fabric structure of the at least second wire layer (120) is oriented in another direction than the cloth/fabric structure of the at least first wire layer (110).