磁流体密封液下泵结构设计与试验  

Structural design and experiment of submerged pump with magnetic fluid seal

作　　者：关红艳[1] 杨逢瑜[2] 王其磊[1] 

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]兰州理工大学磁性物理与磁技术研究所,甘肃兰州730050

出　　处：《排灌机械工程学报》2011年第1期21-25,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：甘肃省自然科学基金资助项目(ZS981-A22-022)

摘　　要：为了解决输送核原料的液下泵工作过程中存在无色剧毒氟化氢气体溢出的问题,在此类液下泵的主轴上选取磁流体为密封材料,应用磁流体密封技术,设计了一套采用螺旋齿的磁流体密封结构,并推导出了密封压差设计公式.通过理论分析和试验研究,讨论了液下泵在液体工作环境下的转速、温度、磁流体体积、密封间隙和磁场强度对磁流体密封承压能力的影响.结果表明,设置在液下泵上的磁流体密封结构的承压能力随着转速、温度和密封间隙的增大而下降;随着磁场强度的升高而增大,且密封承压能力试验值最大可达8×105Pa;随着磁流体体积的增大而增大,但是当磁流体体积超过一定的临界值后,磁流体密封的承压能力将不再随着磁流体体积的改变而改变,仅仅保持在某一恒定值.该磁流体密封结构的密封方法将会有效地解决输送核原料的液下泵中害氟化氢气体泄漏的问题.In order to solve the leakage problem of colorless and virulent hydrogen fluoride in the transportation process of nuclear raw materials of submerged pump, magnetic fluid sealing technology was introduced. A set of sealing structure adopting screw tooth was designed, and design formulas of seal pressure differential were deduced. Through theoretical analysis and experimental investigations, the impact of rotation speed, temperature, magnetic fluid volume, sealing clearance and magnetic field intensity on sealing loading capacity of magnetic fluid in liquid working environment were discussed. The results show that the loading capacity decreases while rotation speed, temperature or sealing clearance increases. The higher the magnetic field strength, the higher the loading capacity. The maximum experimental value of loading capacity is 8×10^5Pa. Besides, the loading capacity enlarges while magnetic fluid volume increases. But when magnetic fluid volume exceeds a critical value, the sealing loading capacity will have no change and maintain at a constant value. The leakage problem of virulent hydrogen fluoride will be effectively solved.

关 键 词：液下泵 磁流体 密封 氟化氢 承压能力 

分 类 号：S277.9[农业科学—农业水土工程] TM201.3[农业科学—农业工程]