| UV-LED is widely used in the field of water sterilization due to its advantages of small size,stable light source,and adjustable wavelength,and is an ideal substitute for mercury light source.Due to the new crown pneumonia epidemic,people have realized the importance of research in the field of air and surface sterilization.Due to the characteristics of the epidemic that can be transmitted through the air,products in the field of sterilization for flowing gases are urgently needed.However,at this stage,the light efficiency of UVC-LED chips is generally low,and it is impossible to complete the killing task alone.It is necessary to design and study the optical and thermal properties of their cooperative work.Based on the 260 nm wavelength UV LED chip,this paper conducts a preliminary design of a UV-LED sterilization module for air and surface sterilization and analyzes its sterilization efficiency.The specific research contents are as follows:(1)Determine the lamp bead package structure.According to the structure of the traditional inorganic packaging form of UV-LED,the optical properties of the sidewall angle of the inner cavity of the lamp bead and the inner surface of the cavity are optimized to improve the light extraction efficiency of the lamp bead.The optical output power and peak irradiance of the optimized structure are 1.54 times and 7.58 times that of the original structure.(2)The optical design of UV-LED sterilization module.Different arrangements of lamp beads are proposed,and the distance between the lamp beads is used as a variable to use Solidworks to carry out 3D modeling of each experimental node.Then,the effects of different lamp bead spacings on the optical performance of UV-LED modules in different lamp bead arrangements were analyzed through Tracepro simulation,and the structure with the best optical performance in each arrangement was screened out.Finally,13 structures with better optical properties were screened out from the five arrangements.(3)Screen the arrangement with the best comprehensive performance of UV-LED sterilization modules.The ANSYS Icepak simulation software is used to analyze the structure with the best optical performance in each lamp bead arrangement,and the thermal performance under the same heat dissipation conditions.Finally,a structure with the best comprehensive optical and thermal properties was selected.(4)UV-LED sterilization module heat dissipation structure design.The heat dissipation structure is designed according to the structure with the best comprehensive performance of the ultraviolet sterilization module.The four factors that may affect the thermal performance of the structure are analyzed respectively,and their value ranges are determined.Orthogonal experiments are designed for these influencing factors on the heat dissipation structure,and their effects on the heat dissipation structure are analyzed one by one.Finally,according to the experimental results,the factors that have the greatest influence on the heat dissipation structure and the parameters of the optimal structure for thermal performance are determined in this experiment.(5)Performance analysis of UV-LED sterilization module application scenarios.A sterilization module that can work together is designed for air sterilization.According to the working environment of pipeline ventilation and sterilization,an experimental platform was built,and the sterilization efficiency and module reliability of working alone and working together inflowing gas were analyzed.A surface sterilization module was initially designed for surface sterilization and the sterilization efficiency was analyzed.Finally,according to the experimental results,the working efficiency of the air sterilization module in different working modes,the external conditions of the operation of the surface sterilization module,and the effective sterilization range are obtained. |
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