Arc Chamber Wire Mesh Venting for Cooling Breaking Gases
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Solution Overview
Problem
Existing switching devices face issues with explosive combustion and particle deposition due to the ignition of breaking gases and fine particles outside the device, which can damage housings and adjacent equipment.
Innovation Solution
A switching device with a multilayer wire cloth or fabric in the orifice of the arc extinguishing chamber, where the first and second wire layers are stacked with rotated weaving directions to change the gas flow direction and provide effective cooling and filtering, preventing ignition and explosive combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single layer of wire cloth or fabric is used in the orifice, then the structure is simple and easy to manufacture, but the cooling and filtering effectiveness is insufficient to prevent ignition and explosive combustion of breaking gases
Solution Approach 1:
The wire cloth or fabric is divided into multiple layers (at least two layers) with different orientations. Each layer provides partial cooling and filtering function, and the combination of multiple layers enhances the overall effectiveness without requiring a single complex thick layer.
Solution Approach 2:
The solution transitions from a single-layer structure to a multi-layer stacked configuration. The layers are arranged in the third dimension (stacked vertically in the orifice), with each layer having a different in-plane orientation (0 degrees and 45 degrees relative to a reference direction), thereby adding dimensional complexity to improve performance.
2Temperature
If the wire layers are stacked with rotated weaving directions, then the gas flow direction is changed and cooling effectiveness is improved, but the manufacturing and installation complexity increases
Solution Approach 1:
The wire layers are intentionally designed with asymmetric orientations (0 degrees and 45 degrees) rather than identical parallel orientations. This asymmetric stacking creates tortuous flow paths that enhance heat transfer and cooling effectiveness by disrupting laminar flow patterns.
Solution Approach 2:
The wire cloth layers are pre-assembled in a stacked configuration with specific orientations before installation. This preliminary assembly ensures correct orientation and spacing, simplifying the installation process while maintaining the desired flow modification and cooling 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 effectively cools and filters outflowing gases, preventing ignition and explosive combustion, thereby protecting the device and surrounding components from damage.
Implementation Method 1
a multilayer wire cloth or fabric comprising at least a first wire layer and a second wire layer... effectively cools and filters outflowing gases
Implementation Method 2
a multilayer wire cloth or fabric comprising at least a first wire layer and a second wire layer... effectively cools and filters outflowing gases
Data Source
AI summary
A switching device includes an arc extinguishing chamber, an orifice for outflow of the gases from the arc extinguishing chamber, and a multilayer wire cloth or fabric having at least a first wire layer and a second wire layer. The first wire layer and the second wire layer have a respective cloth or fabric structure including respective warp yarns and weft yams. The first and second wire layers are disposed in a stacked configuration in the orifice such that a weaving direction of the warp yams of the first wire layer is rotated by an angle in relation to a weaving direction of the warp yarns of the second wire layer, and a weaving direction of the weft yarns of the first wire layer is rotated by an angle in relation to a weaving direction of the weft yarns of the second wire layer.