论文部分内容阅读
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。
With the development trend of large-scale high-pressure centrifugal pumps, the vibration and stability of the rotating shaft system besides the hydraulic properties are also the key issues in the design process. The calculation of the critical speed of wet-wetting is particularly prominent. Different from general pumps, bearing support for the rotor is not enough when considering rotor dynamics analysis. Due to the design of annular seal and balance mechanism between stages of high-pressure centrifugal pumps, there is a high pressure drop at both ends of the gap Cause flow, when the pump shaft deviation from the equilibrium position due to the flow of these gaps will have a great restoring force acting on the pump shaft. The high-power high-pressure multi-stage centrifugal pump is generally horizontal, and interstage seal ring located between the two radial bearings, so its rotor dynamics analysis should also consider interstage seal gap flow.