Development And Application Of Efficient And Environmentally Friendly Automatic Disinfection Equipment For Elevators

At present,COVID-19 is still rampant around the world,and the virus prevention and control work cannot be ignored.Elevator cabins,as an indispensable means of transportation in our daily life,have become the place with the highest risk of COVID-19 infection,because of their confined spaces with poor air circulation inside the cabins,dense mobility of people and close contact distance between passengers.However,the current method of disinfection of elevator cabins still has a series of problems such as crossinfection,disinfection dead spots,and uncomfortable riding experience.Therefore,it is of great significance to design an automatic disinfection equipment with high disinfection efficiency and environmental protection.In this paper,according to the working environment and actual functional requirements of the equipment,and aiming at the shortcomings of the existing elevator cabins’ epidemic prevention and disinfection methods,a high-efficiency environmental protection automatic disinfection equipment based on swirl atomizing nozzle is developed,which has multiple modes,can automatically monitor the use of elevator cabins and automatically configure disinfectant.Design and calculate the mechanical parts of the efficient and environmentally friendly automatic disinfection equipment for elevator cabins,including disinfectant silos,tap water storage tanks,disinfectant storage tanks,etc.,and meet their usage needs.The three-dimensional model of the equipment is built by Solidworks so as to eliminate interference between components.Secondly,through simulation with Fluent,it is found that the main factor affecting the disinfection effect of atomization disinfection equipment is the atomization level of the atomization nozzle.Further analyze the atomization condition of the atomization nozzle under three parameters: different jet water pressure,the inclination angle of water inlet groove,and pore size,then select an optimal plan to improve disinfection efficiency.The discrete phase model is used to simulate the working conditions of the equipment under four groups of different nozzle placement angles and the optimal nozzle placement angle that meets the requirements is determined through analysis.Based on the STM32 one-chip computer automatic control system,the modular design is adopted to determine the data collection method of the liquid level sensor and the human body recognition sensor,as well as the control logic of each component,and the workflow design of each mode of the atomization disinfection equipment is completed.The human-computer interaction system of each module such as automatic and manual mode switching of the equipment is designed,and realize functions such as remotely controlling the equipment for disinfection,feeding,and water addition.Finally,the variation patterns of atomization cone angle,droplet coverage density,droplet deposition amount,and droplet filling rate of atomization equipment under different parameters were verified through experiments.At the same time,experimental analysis was conducted on the disinfection effect of multiple bacteria,and the bactericidal rate of atomization disinfection equipment on multiple bacterial groups was obtained.Through the above study,without affecting the experience of passengers,manual participation and the risk of cross-infection are reduced,blind disinfection areas are avoided,disinfection efficiency is increased,disinfection effect is improved,and disinfection droplets are quickly and evenly spread to all parts of the elevator cabins.