Low-Pressure UV Lamp Tube Current Density Optimization
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Solution Overview
Problem
Conventional ultraviolet sterilization and disinfection devices for air purification have low ultraviolet dosage, leading to inefficient sterilization and disinfection, particularly in large volumes, due to low illuminance and short irradiation times, which is impractical and costly, and poses a risk for highly infectious pathogens.
Innovation Solution
The use of low-pressure ultraviolet lamps with optimized diameters and current densities, combined with adjustable output power and mercury vapor pressure control, to increase ultraviolet dosage and efficiency while reducing device size and energy consumption, using electrode-containing or electrodeless lamps in various shapes to ensure uniform illuminance distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional mercury vapor discharge ultraviolet lamps with low power density are used, then the device can be operated, but the ultraviolet illuminance is low and the sterilization efficiency is insufficient
Solution Approach 1:
The patent changes the key parameter of tube current density from conventional low values to optimized high values (0.250-0.800 A/cm² or higher), which directly increases the ultraviolet illuminance output. This parameter change enables the ultraviolet lamp to achieve sufficient sterilization dosage without requiring excessive increase in power, resolving the contradiction between illuminance intensity and power density.
2Duration of action of moving object
If the ultraviolet sterilization chamber volume is increased to prolong irradiation duration, then the sterilization thoroughness improves, but the device becomes bulky and expensive
Solution Approach 1:
By optimizing the tube current density parameter, the patent achieves high ultraviolet illuminance that delivers sufficient dosage in short irradiation time. This eliminates the need to increase chamber volume to extend irradiation duration, thus resolving the contradiction between irradiation duration and chamber volume.
Solution Approach 2:
The high illuminance ultraviolet lamps enable the system to 'rush through' the sterilization process by delivering adequate dosage in very short time, eliminating the need for prolonged irradiation that would require large chamber volumes.
3Reliability
If multiple ultraviolet lamps and long sterilization chambers are used to achieve sufficient ultraviolet dosage, then the sterilization effect improves, but the device complexity and cost increase
Solution Approach 1:
The patent achieves reliable sterilization effect by changing the tube current density parameter to optimized values, which dramatically increases ultraviolet illuminance. This single parameter change allows using fewer lamps and shorter chambers while maintaining or improving sterilization reliability, thus reducing device complexity.
Solution Approach 2:
The patent extracts the essential requirement for high ultraviolet dosage and achieves it through optimized lamp parameters rather than through multiple lamps and long chambers. This extraction of the core requirement simplifies the overall device configuration and reduces complexity.
4Loss of energy
If conventional ultraviolet lamps with low tube current density are used, then the device can operate, but the ultraviolet conversion efficiency decreases significantly with heat conduction of gas flow
Solution Approach 1:
The patent optimizes the tube current density parameter to high values, which fundamentally changes the operating characteristics of the ultraviolet lamp. This parameter optimization improves ultraviolet conversion efficiency and reduces power loss due to heat conduction, resolving the contradiction between energy loss and output power.
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 significantly enhances the ultraviolet sterilization and disinfection efficiency, achieving higher single-time killing rates with reduced device volume and energy consumption, ensuring effective disinfection even at varying wind speeds and temperatures, while maintaining safety and ease of maintenance.
Implementation Method 1
An ultraviolet source may be an ultraviolet LED or an ultraviolet mercury vapor discharge lamp
Implementation Method 2
Ultraviolet may destroy DNA and RNA of microorganisms, thus killing the microorganisms
Implementation Method 3
ultraviolet may decompose some harmful organics, where the decomposition may be better carried out when combining with oxygenolysis effect of ozone, hydrogen peroxide and the like
Implementation Method 4
combining with oxygenolysis effect of ozone, hydrogen peroxide and the like
Data Source
AI summary
Provided herein is an ultraviolet sterilization and disinfection apparatus. One or multiple low-pressure ultraviolet lamps are arranged within the ultraviolet sterilization and disinfection apparatus. A configuration method therefor is such that the inner diameters of the low-pressure ultraviolet lamps are Φ30-36 mm and the tube current density is: 0.250-0.800 A/cm2; alternatively the inner diameters are Φ26-30 mm and the tube current density is: 0.280-0.850 A/cm2; alternatively, the inner diameters are Φ20-26 mm and the tube current density is: 0.300-1.100 A/cm2; alternatively, the inner diameters are Φ15-20 mm and the tube current density is: 0.340-1.350 A/cm2. The method allows the ultraviolet dosage of the ultraviolet sterilization and disinfection apparatus to be increased, thus increasing efficiency in sterilization and disinfection.