Abstract:  Irrigation is a means to ensure the stable development of agriculture. With the development of modern agriculture, the demand for irrigation pumps is increasing. High flow irrigation pumps are often characterized by large and wide vanes due to their unique operating conditions and requirements. As an important part of the rotor system, the deformation and strength of the impeller and rotor components have a great impact on the safety performance and efficiency of the whole system of the irrigation pump. This paper took large flow irrigation pump as the research object, and used AnsysWorkbench software to conduct finite element analysis on its large flow area. The deformation and strength analysis and modal analysis of the rotor components were carried out separately. The results showed that when the flow rate was 500 m3/h, the maximum equivalent stress of the blade was 23.83 MPa, and the maximum deformation value of the blade was 0.341 mm, and the maximum deformation area appeared at the edge of the blade. Under the condition of large flow, compared with the natural frequencies of different flow conditions, there is no significant relationship between the flow size and the natural frequencies of the rotor system in the vibration modes of each stage, but different materials have a significant impact on the natural frequencies of the rotor of the high flow irrigation pump.

Key words: irrigation pump, numerical simulation, strength check, rotor dynamics

摘要： 灌溉是保障农业稳定发展的手段，随着现代农业的发展，对灌溉水泵的需求日益增加。大流量灌溉泵因其独特的工作环境和要求，它的叶片通常具有扭曲度大和宽等特点。作为转子系统中重要的部分，叶轮及转子部件的变形与强度对灌溉泵整个系统的安全性能和效率都有很大影响。以大流量灌溉泵为研究对象，使用AnsysWorkbench软件对其大流量区进行有限元研究，对转子部件分别进行变形与强度分析和模态分析。结果表明，在流量为500 m3/h时，叶片受最大等效应力为23.83 MPa，此时出现叶片最大形变值为0.341 mm，最大变形区域都出现在叶片边缘处。大流量工况下，对比不同流量工况的各阶固有频率，在各阶振型中流量大小与转子系统的固有频率没有显著关系，但不同材料明显地影响大流量灌溉泵的转子的固有频率。

关键词: 灌溉泵, 数值模拟, 强度校核, 转子动力学