Offset Electrode Through Holes for Plasma Reactor Discharge
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Solution Overview
Problem
Conventional plasma reactors for exhaust gas cleaning suffer from low efficiency due to plasma generation occurring only in narrow regions, resulting in inadequate removal of particulate matter (PM) from engine exhaust gases.
Innovation Solution
A plasma reactor design featuring electrode panels with through holes of varying shapes and offsets, allowing dielectric barrier discharge to occur across a broader area, thereby generating plasma in a wider region and effectively oxidizing and removing PM from exhaust gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrodes with through holes in the same pattern are disposed in parallel, then the structure is simple and easy to manufacture, but discharge occurs only at narrow regions resulting in low exhaust gas cleaning efficiency
Solution Approach 1:
The patent applies asymmetry by offsetting the through holes of adjacent electrodes in the stacking direction. Specifically, the through holes of electrodes are arranged such that they do not align with each other, creating asymmetric discharge paths that expand the plasma generation region. This asymmetric arrangement ensures that discharge occurs across a broader area rather than being confined to narrow aligned regions, thereby improving exhaust gas cleaning efficiency while maintaining manufacturing simplicity.
2Device complexity
If through holes are provided only in one of the unit electrodes, then the structure is simplified, but discharge occurs at unspecific portions causing plasma generation region and amount to vary resulting in low exhaust gas cleaning efficiency
Solution Approach 1:
The patent applies local quality by providing through holes in both electrodes but with different patterns. Specifically, the first electrode has through holes at specific positions while the second electrode has through holes at offset positions. This creates localized discharge regions at multiple positions between the electrodes, ensuring uniform plasma generation across the entire electrode area. The different through hole patterns in each electrode enable controlled discharge at specific locations rather than allowing unspecific discharge, thereby improving exhaust gas cleaning efficiency.
3Ease of operation
If stripe-form electrodes are disposed with intersecting strips, then plasma is generated at intersections, but the plasma generation region is narrow resulting in low exhaust gas cleaning efficiency
Solution Approach 1:
The patent applies dimensionality change by transitioning from a planar stripe-form electrode configuration to a three-dimensional stacked electrode configuration with offset through holes. Instead of relying on two-dimensional intersection points of stripes, the invention uses three-dimensional offset arrangements of circular or polygonal through holes in stacked electrodes. This dimensional transformation expands the plasma generation from discrete intersection points to a broader three-dimensional region, significantly improving exhaust gas cleaning efficiency while maintaining operational simplicity.
Data Source
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Figure 5~6
AI summary
Electrode panels (21, 22) each including a dielectric body (23) and an electrode (24, 25) are disposed in parallel at intervals, and plasma is generated between the electrode panels (21, 22). Each electrode (24, 25) has through holes (33, 43) each having a shape having a corner (34, 44) in plan view. At least some of the corners (34) of the through holes (33) of a first electrode (24) do not overlap with at least some of the corners (44) of the through holes (43) of a second electrode (25).