Design and test of hand-carried air-assisted electrostatic sprayer

Abstract

The traditional hand-carried boom sprayer has a large spray volume and a small working range, while the traditional air-assisted sprayer has uneven droplet distribution. In response to these problems, this research designed a hand-carried air-assisted electrostatic sprayer, which are charged by direct contact charging method. In order to explore the spray performance of a hand-carried air-assisted electrostatic sprayer, and to clarify the effect of different parameters on the performance of the sprayer, a spray test platform was set up. The test factors were based on spray pressure, spray distance and charging voltage, and the charge characteristics, droplet size and deposition characteristics were tested by the droplet mass-charge ratio, the average diameter and the spray coverage. The experimental results show that: The droplet charge-mass ratio increases with the increase of the charging voltage. When charging voltage is greater than 7kV, the sprayer has the best charging effect when the spray pressure is 0.4MPa; Electricity can improve the atomization performance, but it will increase the droplet relative span, so the charging voltage should not be too large; Electricity and air-assisted improve the spray performance, the spray efficiency is increased by 32.6%, and the water is saved by 23.3%.