螺杆型施肥泵特性及降维简化方法研究

Research of screw fertilizer pump characteristics and simplification algorithm

精准配肥是当前水肥一体化研究中的1个关键问题,它可以实现作物营养按需供给,同时也能够提高肥料利用率,对施肥泵特性的分析是实现精准配肥的前提。螺杆泵具有结构简单、造价低、体积小,安装检修方便的优点,适用于黏性较大的液体,易于实现流量的精准控制。笔者针对GQS型潜水螺杆泵进行研究,测定了其特性,建立了流量、压强和电压3个变量之间的关系模型,并通过边折叠算法对其进行了降维简化。试验结果表明,与原模型相比,使用简化模型后,平均误差保持在3%之内,单片机运算速度提升了54.8%,实现了快速控制,提高了配肥效率,该方法为实现精准高效配肥提供了1种有益的参考。

Accurate fertilization is a key issue in the current research of the integration of water and fertilizer.It can realize the on-demand supply of crop nutrients and also improve the fertilizer utilization rate.Analysis of the characteristics of the fertilizer pump is a prerequisite for achieving accurate fertilization.Screw pumps have the advantages of simple structure,low cost,small size,convenient installation and maintenance.They are suitable for relatively viscous liquids and are easy to achieve accurate flow control.In this study,the characteristics of the GQS submersible screw pump are measured,the relationship model between the three variables of flow,pressure and voltage is established,and the dimension reduction and simplification are performed by the edge collapse.The test results show that compared with the original model,the average error remains within 3%after using the simplified model,and the operation speed of the single-chip microcomputer is increased by 54.8%,which achieves rapid control and improves fertilizer distribution efficiency.This method provides a useful reference for accurate and efficient fertilization.