摘要
为解决水肥一体化应用中施肥流量随着灌溉管道工作压力变化而波动导致施肥浓度不均匀的问题,设计了一种额定流量为300 L/h、最大工作压力为1.0 MPa的柱塞式注肥泵,对柱塞泵进行不同行程比例和电源频率下的工作流量试验,建立了工作流量与电源频率、行程比例及灌溉管道压力的拟合公式.结果表明:研发的柱塞泵工作流量与电源频率、行程比例均呈极显著的线性正相关,与灌溉管道压力呈显著负相关,以相对标准偏差RSD表示的流量测量精度范围为0.09%~1.43%;行程比例为100%、电源频率为50 Hz时,当灌溉管道压力由0.1 MPa增至0.5 MPa,柱塞泵工作流量下降14.22 L/h,占平均流量的4.58%,RSD最大值仅为0.38%,表明柱塞泵工作流量很稳定,可以适应喷灌和微灌水肥一体化系统不同工作压力的需求.以研发的柱塞泵为核心,提出了仅改变电源频率实现精准施肥的控制策略,具有控制算法简单、流量调节精准、投资成本低等优势,适合于水肥一体化精准施肥.
In order to solve the problems of uneven fertilization concentration caused by the flow rate fluctuation with the changed irrigation pressure of irrigation pipeline in the integrated application of water and fertilizer,a piston injection pump with rated flow rate of 300 L/h and maximum working pressure of 1.0 MPa was designed.Then characteristic performances of the piston injection pump were carried out under different stroke ratio and power supply frequency.The fitting formulas of flow rate with power supply frequency,stroke ratio and irrigation pressure were established.The results show that the working flow rate of the piston injection pump is very significantly positively correlated with the power frequency and stroke ratio,but significantly negatively correlated with the irrigation pressure.The flow rate measurement accuracy expressed by relative standard deviation(RSD)ranges from 0.09%to 1.43%.When the stroke ratio is 100%and the power frequency is 50 Hz,as the irrigation pressure increases from 0.1 to 0.5 MPa,the drop of the flow rate is 14.22 L/h,accounting for 4.58%of the ave-rage flow,and the maximum RSD is only 0.38%.It is indicated that the flow rate of the piston pump is very stable and can meet the needs of different working irrigation pressure of sprinkler irrigation and micro-irrigation water and fertilizer integrated system.In addition,taking the piston injection pump as the core component,the control strategy of only changing the power frequency of the piston injection pump is proposed.It has the advantages of simple control algorithm,accurate flow regulation and low investment cost.It is suitable for precision fertilization of water and fertilizer integration.
作者
王晶晶
卓越
张颢晖
严海军
王春晔
孟范玉
WANG Jingjing;ZHUO Yue;ZHANG Haohui;YAN Haijun;WANG Chunye;MENG Fanyu(College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China;Intelirri(Beijing)Technology Co.Ltd.,Beijing 100088,China;Beijing Agricultural Technology Extension Station,Beijing 100029,China)
出处
《排灌机械工程学报》
CSCD
北大核心
2022年第1期22-29,共8页
Journal of Drainage and Irrigation Machinery Engineering
基金
“十三五”国家重点研发计划项目(2017YFD0201502)
新疆维吾尔自治区重点研发项目(2018B01002-2)
河南省科技开放合作项目(172106000015)
河北省重点研发计划项目(21327002D)。
关键词
柱塞式注肥泵
精准施肥
水肥一体化
喷灌
piston injection pump
precise fertilization
water and fertilizer integration
sprinkler irrigation
