基于PWM技术的连续式变量喷雾装置设计与特性分析

Variable-rate Continuous Spray Equipment Based on PWM Technology and Its Spray Characteristics

使用电磁比例调节阀,开发了脉宽调制(PWM)连续式变量喷雾装置,并研究了此种变量喷雾装置的喷雾特性。结果表明:流量调节范围较宽,平口扇形喷嘴的流量调节范围达7∶1;当减小占空比,以减小流量时,显著改变了喷雾发散度,雾量分布明显向中央集中,喷雾角变小;流量控制对雾滴粒径影响很小,随着流量减小,雾滴粒径稍有减小的趋势。

A set of variable-rate continuous spray equipment was developed by using the proportional regulating solenoid valve based on pulse-width modulation （PWM） technology. The effects of this variable-rate spray equipment on spray characteristics were studied. It was concluded that the flow regulating range of this set was wide. The flow regulating range for the flat-fan nozzle was about 7 ： 1. When the spray flow-rate was reduced through decreasing the duty cycle, the degree of spray dispersion was changed significantly. The spray distribution concentrated toward the center obviously and the spray angle became smaller. But the effects of the flow control on spray droplet diameter were slight. The spray droplet size decreased slightly with the flow decreasing.