Nonthermal Plasma Exhaust Apparatus Arcing Prevention

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Solution Overview

Problem

Existing nonthermal plasma-based exhaust gas particulate matter reduction apparatuses face challenges in preventing arcing phenomena between the rod and the chamber, which reduces plasma efficiency, causes damage, and increases fatigue in power supply devices.

Innovation Solution

The apparatus includes an arcing prevention unit for insulating the rod and the chamber, a control unit to generate a minimum voltage for nonthermal plasma occurrence, and a multiple plasma generation and voltage application unit to maintain high particulate matter reduction efficiency while reducing arcing and power supply fatigue.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If high voltage is applied to generate nonthermal plasma for particulate matter reduction, then plasma generation efficiency is improved, but arcing phenomenon occurs between the rod and chamber

Engineering Contradiction:

Improveparticulate matter reduction efficiencyVSAvoidarcing phenomenon prevention

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent introduces an insulating coating layer as an intermediary substance between the rod and chamber. This coating layer mediates the electrical field distribution, preventing direct arcing while allowing the rod to apply high voltage to the exhaust gas for plasma generation. The insulating coating acts as a buffer that eliminates the harmful arcing phenomenon while preserving the useful plasma generation function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If high voltage is continuously applied to maintain plasma generation, then particulate matter reduction efficiency is maintained, but power supply device fatigue increases

Engineering Contradiction:

Improveparticulate matter reduction efficiencyVSAvoidpower supply device service life

Core Design Contradiction:

ProductivityVSDuration of action of stationary object

Solution Approach 1:

The patent employs periodic pulsed voltage application instead of continuous high voltage. The power supply device applies voltage in periodic pulses to the rod, creating nonthermal plasma only during the pulse periods. This periodic action maintains particulate matter reduction efficiency while significantly reducing the cumulative stress and fatigue on the power supply device, thereby extending its service life.

Inventive Principle:

Principle #19Periodic action

3Power

If arcing phenomenon occurs between rod and chamber, then electrical discharge is intensified, but plasma generation efficiency is reduced

Engineering Contradiction:

Improveelectrical discharge intensityVSAvoidplasma generation efficiency

Core Design Contradiction:

PowerVSProductivity

Solution Approach 1:

The patent applies local quality modification by coating only the rod surface with insulating material, while leaving the chamber and other components unchanged. This localized treatment prevents arcing at the rod-chamber interface specifically, while maintaining the electrical discharge intensity needed for plasma generation in the exhaust gas. The insulating coating creates a locally modified electrical field distribution that eliminates harmful arcing while preserving useful plasma generation.

Inventive Principle:

Principle #3Local quality

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 prevents arcing between the rod and the chamber, suppresses persistent arcing situations, and reduces the occurrence probability of arcing and fatigue in power supply devices, while maintaining high particulate matter reduction efficiency.

Implementation Method 1

a voltage generation unit for generating a steady-state voltage at which maximum efficiency of a nonthermal plasma phenomenon is generated

Methodology Applied

Scientific EffectNonthermal plasma: Plasma

Implementation Method 2

an arcing prevention unit which prevents an arcing phenomenon from occurring between the rod and the chamber by providing insulation between the rod and the chamber

Methodology Applied

Scientific EffectElectrical insulation: Electrical Resistance

Data Source

PatentUS12285720B2Non-thermal plasma-based exhaust gas particulate matter reduction apparatus for preventing arcing phenomenon

Publication Date: 2025.04.29 THE PRIME SOLUTION L L C

AI summary

Disclosed is a nonthermal plasma-based exhaust gas particulate matter reduction apparatus for preventing an arcing phenomenon, the apparatus comprising: a chamber which is a tubular body having exhaust gas flowing therein and is connected to a ground power supply; a power supply device which is disposed outside the chamber and includes a voltage generation unit for generating a steady-state voltage at which maximum efficiency of a nonthermal plasma phenomenon is generated; an emitter which is disposed inside the chamber and generates nonthermal plasma between the chamber by having the steady-state voltage applied thereto; a rod which applies the steady-state voltage to the emitter by electrically connecting the voltage generation unit and the emitter; and an arcing prevention unit which prevents an arcing phenomenon from occurring between the rod and the chamber by providing insulation between the rod and the chamber.