环保型叶片调节系统的开发与应用  

Development and application of environment-friendly blade adjusting device

作　　者：张仁田[1,2,3] 邓东升[4] 朱红耕[2] 李龙华[3] 岳修斌 

机构地区：[1]江苏省水利勘测设计研究院有限公司,江苏扬州225127 [2]扬州大学水利科学与工程学院,江苏扬州225009 [3]河海大学机电工程学院,江苏常州213022 [4]南水北调东线江苏水源有限责任公司,江苏南京210029

出　　处：《排灌机械工程学报》2013年第11期948-953,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51179048);"十一五"国家科技支撑计划项目(2006BAB04A03)

摘　　要：叶片全调节是大型叶片泵工况调节的主要方式,在分析传统的机械和液压叶片调节方式存在问题的基础上,提出将机械式操作拉杆和液压式操作动力进行组合的环保型叶片调节机构,并设计了接力器的活塞缸分别布置在水泵轴和电动机轴之间的中置式和布置在轮毂上方的下置式2种叶片调节机构型式,较好地解决了密封要求高的问题,保证叶轮无泄漏.建立以三维CFD模拟技术为基础的叶片受力和水力矩大小及分布的预测和计算模型,提出了按不同叶片安放角和不同运行工况下力矩分布设计接力器结构(直径和压力等级)的方法.对现有的受油器结构和控制原理进行改进与完善,并成功研制采用伺服电动机-配压阀和数字比例阀的新型受油器结构,其调节精度可达4‰,实现了叶片精确调节和开/闭环控制.Blade adjusting is a main method for regulating operational conditions of large-size blade adjustable impeller pumps. An environment-friendly blade adjusting device was developed through a combination of mechanical adjusting mechanism with hydraulic one based on an analysis of shortcomings of existing conventional mechanical and hydraulic adjusting mechanisms. For the device,two designs were proposed,in one design the servo-cylinder is positioned between the pump and electric motor shafts,in the other design,the cylinder is positioned on the top of the hub of the impeller. Thus,the leakage of pressured hydraulic oil can be avoided by using reliable seals. A computational model was established to predict hydrodynamic force and moment of fluid on single blade based on 3D CFD technology. As a result,an approach was put forward in which the cylinder diameter and its operating pressure can be determined by means of a prescribed blade setting angle and predicted hydrodynamic moments at various operating points of pump. Additionally,the structure and governing principle of the conventional oil receptor head were updated and improved; and an oil receptor head with servo-cylinder,pressure control valve and digital proportional valve was innovated successfully. A 4‰ control accuracy has been reached for the device,thus an open/closed-loop control can be realized to adjust blade angle precisely.

关 键 词：叶片泵 叶片调节 接力器 受油器 密封 

分 类 号：TH[机械工程]