Research And Design Of The Device Purifying The Electric Welding Smoke And Dust With The Corona Plasma On The Spot

It is a new technology that welding soot is purified with corona plasma right on the spot.The technology combines rudiment of ESP with method of controlling somke and dust,thus attaining the aim purifying somke and dust right on the spot..The device purifying welding soot with corona plasma consists with power controllers high voltage generator and electrostatic field. The power controller's function is controlling start and protecting excessive voltage and excessive current.The hight voltage generator supplys loop with negative high voltage through high voltage cable,me inputting AC passing by commuating -inverting -boost-multiplier. So a electrostatic field is formed in the loop and "ground"(welding workpiece).In electrostatic field,the air surrounding corona line is ionizated and a great quantity positive and negative ion is generated. The positive ion moves toward cathode(generating loop) and the negative ion moves toward anode(welding workpiece). The negative ion makes dust carrying charges in the process.The dust which size exceeds 0.5 # m carry charge through crashing,which size exceeds 0.2 # m through diffusing.One dust on the face of welding workpiece adheres afer being carried charge and can't float in the sky;the other having floated in the sky quickly returns wokpiece with electric field power(kulun power , force of ionic wind)and its gravity afer being carried charges ,thus attaining the aim purifying somke and dust right on the spot.The paper analyzes all kinds method of computing electric fields's strength,employs simulating charge method computing the electric field's strength,establishs mathematical models relevant to purifying welding soot.The paper conducts welding soot diffusing model base on the model of air pollution diffusion, the model earring charge by electric field and diffusion and purifying efficiency theoretical formula through probability, in addition to anlyzing which parameter relevant to purifying efficiency.A high voltage pulsing DC power is devised with economic an useful method.The paper analyzes main circuit, oscillatic circuit , inventing circuit and multifying circuit,some circuits are imitated and tested.The loop generating plasma is devised through theoretical an trial research. The purifying efficiency is mensurated with weight filter method.