直流离子发生器性能的研究

Study of the performance of DC ionic generator

在针环状直流离子流发生器的导引环上增加了导引电阻，离子流引出总量和引出效率得到显著提高并随导引电阻增大趋于饱和。对导引环孔径为３．０ｍｍ，针环距为零，总电晕电流为２５．０μＡ，气流量为７．０ｍ３／ｈ的负离子流发生器，当导引电阻由零增加到１５０ＭΩ以上时，离子流引出总量和引出效率分别由１．０μＡ和４％增加到饱和值４．７５μＡ和１９％。增大气流量或减小导引环孔径和针环距也可同时增大离子流引出总量和引出效率。对导引环孔径为１．５ｍｍ，针尖电压为－１５．０ｋＶ，导引电阻为２００ＭΩ，针环距为零，气流量为５．６ｍ３／ｈ的离子流发生器，离子流引出总量和引出效率分别可达１７．４μＡ和３０％。但过大的气流速度会产生严重的气流噪音，这对实际应用不利。增大电晕电压和电晕电流可增加离子流引出总量，但引出效率却下降。该工作对直流离子流静电消除器。

? With the needle ring shaped DC ion airflow generator, the drawing off efficiency η and the amount of drawing off ion airflow I 2 can be greatly increased by connecting an inducing resistor to the inducing ring and they reach saturation values as the resistor is varied. While the bore diameter of the inducing ring is 3.0 mm, the needle ring distance 0, the total corona current 25.0 μA and the air flow quantity 7.0 m 3/h, I 2 and η can be increased from 1.0 μA and 4% to saturated values of 4.75 μA and 19% respectively with the resistor from 0 to 150 MΩ and over. I 2 and η can also be increased with the air flow rate and reduced with the needle ring distance and the bore diameter of the inducing ring. With the inducing resistor of 200 MΩ, the bore diameter 1.5 mm, the needle ring distance 0 and the corona voltage -15.0 kV, I 2 and η go up to 17.4 μA and 30% respectively while the air flow quantity is 5.6 m 3/h. But due to the series noise generated by high speed air flow through the bore hole, higher air flow rate is not the best choice for actual applications. The efficiency η is reduced while I 2 is still increased with the corona voltage and the corona current. The results are valuable for the design and performance improvement of DC ion air flow electrostatic eliminators, electrostatic spraying and coating guns and negative ion generators. 