Plasma Reactor Electrode Layout for Uniform Air Sterilization
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Solution Overview
Problem
Current plasma air sterilizing and purifying devices face issues with reactor design, leading to susceptibility to burning, non-uniform discharge, and reduced sterilizing efficiency, along with power supply mismatches causing inefficiency and reliability concerns.
Innovation Solution
The design incorporates a plasma reactor with nickel-chromium alloy wires or belts as positive electrodes on a micro-discharge preventive conductor rail, paired with a high-voltage pulse power supply that generates stable, high-concentration plasma through corona discharge, ensuring uniform plasma distribution and preventing micro-discharge effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thin metal wires are used as positive electrodes to generate high-concentration plasma, then sterilizing efficiency is improved, but the electrode becomes susceptible to burning and has reduced reliability
Solution Approach 1:
The patent uses nickel-chromium alloy wires instead of pure metal wires for the positive electrode. This composite material approach provides both high plasma generation efficiency and resistance to burning, resolving the contradiction between sterilizing efficiency and electrode reliability.
2Reliability
If saw tooth or needle tip structures are used on positive electrodes to prevent burning, then electrode reliability is improved, but discharge becomes non-uniform and sterilizing efficiency decreases
Solution Approach 1:
The patent employs smooth cylindrical nickel-chromium alloy wires as positive electrodes without any protruding structures. This homogeneous design ensures uniform plasma discharge along the entire electrode surface, maintaining high sterilizing efficiency while the nickel-chromium alloy material itself provides burning resistance.
3Device complexity
If conventional power supplies are used with plasma reactors, then device complexity is reduced, but plasma generation efficiency decreases and energy consumption increases
Solution Approach 1:
The patent specifies precise electrical parameters for the power supply including voltage (10-20 kV), frequency (20-100 kHz), and pulse width (10-100 μs). By optimizing these parameters, the system achieves high plasma generation efficiency while maintaining relatively simple device architecture.
4Productivity
If high voltage is applied continuously to maintain plasma discharge, then sterilizing efficiency is improved, but energy consumption increases and ozone generation increases
Solution Approach 1:
The patent employs pulse-width modulated power supply with adjustable pulse widths (10-100 μs) and frequencies (20-100 kHz). This periodic action maintains plasma discharge efficiency while reducing overall energy consumption and minimizing ozone generation by controlling the duty cycle of the high voltage application.
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 configuration enhances the reliability and service life of the plasma air sterilizing and purifying device, improving air sterilization and purification efficiency while maintaining low energy consumption and reducing ozone generation.
Implementation Method 1
the positive electrode is made of several nickel-chromium alloy wires or nickel-chromium alloy belts; the mechanism of the plasma air sterilizing and purifying device is as follows: The plasma is a gas cloud which consists of a great amount of positive and negative charged particles and neutral particles
Implementation Method 2
The plasma can severely break down and damage the cell membranes of bacteria and break the molecular bonds of the gas to generate radicals such as monatomic molecules, negative oxide ions, OH ions, free oxygen atoms and H2O2
Implementation Method 3
The plasma reactor has an electrostatic field which can absorb particles with a minimum particle size of 0.1 um to further purify the air
Data Source
AI summary
The present invention belongs to the technical field of air sterilizing and purification and in particular relates to a plasma air sterilizing and purifying device and an air sterilizing and purifying method. The plasma air sterilizing and purifying device comprises a plasma reactor, a pulse power supply, a fan component, a control device, a power adaptor, and a housing case, wherein the reactor is provided with positive electrodes formed by several nickel-chromium alloy wires or nickel-chromium alloy belts, and the two ends of each positive electrodes are fixed in the corresponding grooves on the micro-discharge preventive conductor rail; and a pulse power supply has a digital control circuit with an oscillator, an error amplifier and a PWM comparator inside which converts signals into a digital control current to control the width of the high-voltage pulse.