Numerical Simulation Of The Electrohydraulic Field In Electrostatic Welding Smoke Purifier

In machinery, construction, railway, automobile, shipbuilding, aviation industry and so on, welding technology is a very common method of mechanical processs. While finishing the welding task, the welding process will produce a lot of welding fumes, harmful gases and the arc light radiation, which can lead to a variety of occupation diseases. Welders’ pneumoconiosis caused by welding fumes has become a major occupation disease in twenty-first Century, seriously endangering the health of welding workers. Now as the country pays more attention to the environmental protection and labor protection, higher requirements on the air quality of the welding workshop will be put forward.In order to improve the workers’ working environment and protect their health of body and mind, the catcher and purification of the welding smoke and dust are particularly important. Especially the method of purifying near the pests occurrence point in time, is most direct and most effective, which the welding smoke purifier can achieve.In order to further optimize the structural parameters and operational parameters of the welding smoke purifier and provide theoretical reference and basis for its design, this article uses COMSOL Multiphysics4.2a, which is a kind of multiple physical fields simulation software, to complete the numerical simulation study on the electrohydraulic field of the charged area in electrostatic welding smoke purifier, on the basis of previous tests and theoretical study. It uses electrostatic model to simulate the electric potential distribution, single phase laminar incompressible Navier-Stokes model to simulate the flow field distribution and coefficient model of partial differential equations to simulate charge transport. Aimed at the symmetric structure of charged area in the purifier, it uses the two-dimensional model and simplifies the air flow of the charged area in a reasonable manner. In the case of other conditions unchanged, by setting different corona voltages, plate distances, corona wire diameters and the wind speeds of entrance in charged area, it obtains the characteristics of electrohydraulic field in charged area under the different conditions, and analyzes the results. The conclusion is that when other conditions are unchanged, to raise the corona voltage, shrink the plate distance, reduce the corona wire diameter and the wind speed of entrance appropriately can be beneficial to enhance the characteristics of electrohydraulic field in charged area, in turn, be advantageous to the dust particles charging and migration velocity increasing, and ultimately improve the efficiency of purification. Finally, in this paper, the running effect of ventilation purification equipment which is used in the electric welding workshop in a machine factory in Shanghai is evaluated.