Plasma Generating Apparatus Single Bath Sterilization
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Solution Overview
Problem
Existing plasma generating apparatuses for liquid purification and sterilization require multiple treatment baths, increasing device size and complexity, while struggling to efficiently generate a liquid with high oxidizing power for effective sterilization and organic decomposition.
Innovation Solution
A plasma generating method and apparatus that uses a single treatment bath with a container, first and second electrodes, and a control circuit to generate first plasma in a liquid bubble without gas supply, then generates second plasma by supplying a gas, allowing for efficient storage and generation of hydrogen peroxide and oxidizing radicals, thereby reducing device size and enhancing treatment performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple treatment baths are used for liquid purification and sterilization, then sterilization effectiveness is improved, but device size and complexity increase
Solution Approach 1:
The patent combines multiple treatment functions (hydrogen peroxide generation and oxidizing radical generation) into a single treatment bath by sequentially generating different types of plasma at different stages, eliminating the need for multiple separate treatment baths while maintaining sterilization effectiveness
Solution Approach 2:
The patent performs preliminary generation of hydrogen peroxide in the first stage, which is then utilized in the second stage to enhance oxidizing radical generation. This preliminary action allows a single treatment bath to achieve cumulative sterilization effects that would otherwise require multiple separate baths
2Productivity
If gas is continuously supplied in liquid during plasma generation, then plasma generation efficiency is improved, but hydrogen peroxide storage and oxidizing radical generation efficiency deteriorate
Solution Approach 1:
The patent employs periodic action by dividing plasma generation into distinct stages: a first stage without gas supply for hydrogen peroxide accumulation, followed by a second stage with gas supply for oxidizing radical generation. This periodic control of gas supply allows the system to optimize both hydrogen peroxide storage and plasma generation efficiency sequentially within a single treatment bath
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 method efficiently generates a liquid with high oxidizing power, enabling effective sterilization and organic decomposition, while reducing the size and complexity of the plasma generating apparatus by utilizing a single treatment bath and optimizing gas and voltage control.
Implementation Method 1
generating first plasma in a bubble generated in the liquid by applying a first voltage between the first electrode and the second electrode
Implementation Method 2
generating second plasma in the first gas by applying a second voltage between the first electrode and the second electrode
Implementation Method 3
hydrogen peroxide generated by the first plasma
Implementation Method 4
oxidation decomposition of organic products is performed using hydrogen peroxide generated by the above oxidizing radicals and oxidizing radicals generated by a high voltage pulse discharge
Data Source
AI summary
A plasma generating method, used in a plasma generating apparatus which includes a container, a first electrode, and a second electrode, includes: supplying a liquid in the container so that the second electrode is in contact with the liquid; in a first period, generating first plasma in a bubble generated in the liquid by applying a first voltage between the first electrode and the second electrode; supplying a first gas in the liquid in a second period after the first period; and generating second plasma in the first gas by applying a second voltage between the first electrode and the second electrode. In generating the first plasma, the first gas is not supplied in the liquid. The bubble contains a second gas.