Design And Experimental Research Of Integrated Clean Air Knife

The air knife is currently an important equipment in the finishing process of the industrial field.It uses the Coanda effect and its unique structure to rectify the clean compressed air,forming a high-concentration,large-flow impact air curtain at the outlet,so as to achieve dust removal and air cooling of equipment or products.In order to ensure the stability of its operation,a certain device in my country has extremely strict requirements on the cleanliness of the internal space of the device and the cleanliness of various optical components.At present,in order to ensure the cleanliness of the surface of the optical element,the method adopted is to use the continuous air flow blown by the air knife to form an isolation air curtain at a certain distance from the surface of the optical element to prevent particulate contaminants from sinking to the surface of the optical element.In the actual operation process,air knives need to be installed on both sides of the optical element to isolate the air curtain.However,due to limited space,the air knives cannot be installed in some locations.At the same time,the fixed installation position of the air knives will also affect the isolation effect of the air curtain.Therefore,in response to this problem,this article proposes a solution for coupling the air knife structure to the frame where the optical element is installed,and conducts design and experimental research around the new integrated clean air knife.According to the design requirements,this paper has determined the design route of the integrated clean air knife,combined with the existing split air knife structure,designed the inner cavity and external structure of the integrated clean air knife,and determined each of the integrated clean air knife The material of the component.Using Fluent software to simulate and verify the integrated clean air knife,the velocity distribution law of the air outlet and the velocity distribution law along the direction of the air outlet were obtained.Modal analysis of the integrated clean air knife is carried out using Modal software.The frequency characteristics of the integrated clean air knife are compared with the frequency characteristics of the original frame,and the influence of the structure of the integrated clean air knife on the vibration of the frame structure is explored.This paper studies the key parts and parameters that affect the isolation effect of the air curtain,and explores the influence of the shape of the air outlet,the width of the air outlet and the position of the air outlet relative to the surface of the optical element on the effect of the air curtain.In view of the influence of the air inlet parameters on the formation of the air curtain,the influence of different inlet diameters and different inlet pressures on the air curtain was explored,and the size of the inlet diameter was determined.Use Design Xplorer software to optimize the design of the final structure,explore the sensitivity of the air outlet wind speed to different parameters,determine the degree of influence of each parameter,obtain the best design point,and determine the final integrated clean air knife size.This article compares the integrated clean air knife with the split air knife and concludes that the integrated clean air knife can replace the split air knife.The air curtain blown by the integrated clean air knife was visualized by using smoke and the silk cluster method,and the distribution law of the air curtain was obtained.Using CFD-EDEM coupling simulation,the movement and force model of pollutant particles in the air curtain were determined,and the wind speed conditions of the air outlet required to isolate pollutant particles of different diameters were explored.The air curtain isolation experiment was carried out on the integrated clean air knife,and the image algorithm technology and weighing method were used to jointly explore the isolation efficiency of different wind speed air curtains on pollutant particles.