旋转喷头变压节能供水变域喷洒控制策略与试验

Variable Range of Precision Spraying of Lawn Sprinkler for Control Strategy by Variable Pressure Technology

针对目前变域喷洒喷头能耗高,喷洒形状不理想等问题,通过深入分析水泵变压运行和喷头变域喷洒机理,得到了喷头实现变域喷洒时两种调节方法的运行规律。推导了变频器频率fv与喷头旋转α角度所用时间t之间的关系方程,提出了一种实现喷头变域喷洒的开环控制策略和通过试验设定控制规律的方法。通过水力能耗的计算发现,采用变频调速方法实现变域喷洒比采用动静片方法节约27%的能量。

There are several factors influence the range of complete fluidic sprinkler.They are inlet press,sprinkler elevation,sectional area,rotate speed,step frequency,pipe length,signal junction depth and so on.Experimental studies of these factors were carried out respectively,the regularity of range influencing factors was found.The inlet press and sectional area were direct proportion to the range of the sprinkler,rotate speed and step frequency were inverse proportion to the range of the sprinkler,pipe length and signal junction depth were lessinfluence the range of the sprinkler.Orthogonal array of five factors and four levels were selected to carry out the experiment.The dates were analyzed by the method of synthesis point rating.The graduations of range influencing factors were achieved after the orthogonal experiments.They were inlet press,sprinkler elevation,sectional area,signal junction depth,pipe length in sequence.The results showed that compared with active static slice method,varible frequency speed control could save energy by 27%.