大功率高压多级离心转子动力学分析  

ROTOR DYNAMICS ANALYSIS ON HIGH-POWER HIGH-PRESSUER MULTI-STAGE CENTRIFUGAL PUMP

作　　者：平仕良[1] 吴大转[1] 谭善光[1] 王乐勤[1] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027

出　　处：《工程热物理学报》2010年第7期1135-1138,共4页Journal of Engineering Thermophysics

基　　金：浙江省重大科技专项(No.2008C13406;No.2008C11056)

摘　　要：随着高压离心泵大型化的发展趋势,在设计过程中,除了水力学性能外旋转轴系的振动及稳定性也是需要重点关注的问题,其中湿临界转速的计算问题尤为突出。与一般水泵不同,在进行转子动力学分析时单考虑轴承对转子的支撑作用是不足的,由于高压离心泵级间环行密封与平衡机构的设计,在这些地方存在由于间隙两端存在高压差而引起流动,当泵轴偏离平衡位置时由于这些间隙流动会产生很大的回复力作用在泵轴上。而大功率高压多级离心泵一般是卧式的,而级间密封环位于两个径向轴承之间,因此对其进行转子动力学分析时还要考虑级间密封间隙流动。The Ultrahigh-pressure multi-stage centrifugal pump develops in the direction of large equipment. So in the design process, besides the hydraulics, the vibration characteristic and stability of the shafting are needed to be focused on. The calculation of the wet critical speed question is particularly prominent. Different from the general rotor system, in analysis the rotor system of multi-stage centrifugal pumps, the force of seal clearance is needed considered, besides the dynamic characteristic of the sliding bearings. On the dynamic characteristics, the effect of the seal ring resemble the sliding bearing, but those working theories are different. The force of the seal clearance is resulted by the axial flow, which is resulted by high pressure, rather than dynamic pressure effect. As the rotor is generally horizontal, and the seals are between in the two journal bearings, so the dynamic characteristic of the seals affect the entire rotor dynamic characteristics.

关 键 词：高压离心泵 临界转速 动特性 密封 间隙特性 

分 类 号：TH311[机械工程—机械制造及自动化]