高速离心泵径向滑动轴承承载能力分析

发布时间：2019-02-20 18:11

【摘要】：高速离心泵是一种特殊的离心泵，该类型泵采用开式叶轮，与普通离心泵相比，具有机构紧凑、零件通用性强、工作可靠、轴向力小、寿命长、扬程曲线平坦等特点，现在已被广泛用于航天航空、石油化工、化肥、制药等行业。该泵高速轴由流体动压润滑滑动轴承支承，滑动轴承具有工作平稳、可靠、噪音较低、减少摩擦磨损等优点，另外，润滑油膜同时还具有一定的吸振能力，这对提高高速轴运转的稳定性和运转精度都是十分有益的。本文围绕高速离心泵径向滑动轴承，对其静特性和动特性进行理论研究，目的是为高速转子支承选用和优化提供依据，并为轴承合理确定配合间隙。论文主要研究工作如下提出了采用径向基配点法对Reynolds方程进行求解，该方法这是一种真正的无网格法，采用标准复合两次函数进行插值，编制了Matlab程序，并将所得结果与经典结论进行对比，，结果十分吻合，验证了该方法和编程思想的正确性。研究了利用径向基配点法对Reynolds方程求解，得到了径向滑动轴承的无量纲油膜压力、承载力、偏位角、端泄量和摩擦力，并分析了偏心率和宽径比对各项静特性的影响，然后用此方法计算了高速离心泵径向滑动轴承的各项静特性，并对其承载力进行了校核，发现满足要求。此算法同时可以用于新的滑动轴承的设计。研究了径向基配点法对扰动压力方程进行求解，求出了无量纲扰动压力和滑动轴承的无量纲动特性系数，并分析了径向滑动轴承结构参数的变化对刚度系数和阻尼系数的影响，计算了高速离心泵径向滑动轴承的扰动压力和在不同偏心率下的动特性系数。最后分析了油膜失稳机理，计算了高速离心泵高速转子不同偏心率下的失稳转速。
[Abstract]:High speed centrifugal pump is a kind of special centrifugal pump. This type of pump uses open impeller. Compared with ordinary centrifugal pump, it has the characteristics of compact mechanism, strong generality of parts, reliable work, small axial force, long life, flat head curve, etc. Now has been widely used in aerospace, petrochemical, chemical fertilizer, pharmaceutical and other industries. The high speed shaft of the pump is supported by hydrodynamic lubrication sliding bearing, which has the advantages of smooth operation, reliability, low noise, reducing friction and wear, etc. In addition, the lubricating oil film also has certain vibration absorption ability. This is beneficial to improve the stability and accuracy of high speed shaft operation. In this paper, the static and dynamic characteristics of radial sliding bearing of high speed centrifugal pump are studied theoretically. The purpose of this paper is to provide the basis for the selection and optimization of high speed rotor support, and to reasonably determine the matching clearance for the bearing. The main research work of this paper is as follows: the radial basis collocation method is used to solve the Reynolds equation. This method is a real meshless method. The standard compound quadratic function is used to interpolate, and the Matlab program is compiled. The results are in good agreement with the classical results and verify the correctness of the method and the programming idea. The radial basis collocation method is used to solve the Reynolds equation. The dimensionless oil film pressure, bearing capacity, offset angle, end discharge and friction force of radial sliding bearing are obtained, and the effects of eccentricity and width to diameter ratio on static characteristics are analyzed. Then the static characteristics of radial sliding bearing of high speed centrifugal pump are calculated and its bearing capacity is checked and found to meet the requirements. This algorithm can also be used in the design of new sliding bearings. The radial basis collocation method is studied to solve the disturbance pressure equation. The dimensionless disturbance pressure and dimensionless dynamic characteristic coefficient of sliding bearing are obtained. The influence of structural parameters of radial sliding bearing on stiffness coefficient and damping coefficient is analyzed. The disturbance pressure of radial sliding bearing and the dynamic characteristic coefficient under different eccentricity of high speed centrifugal pump are calculated. Finally, the mechanism of oil film instability is analyzed, and the instability speed of high-speed centrifugal pump rotor under different eccentricities is calculated.
【学位授予单位】：南京林业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.31;TH311

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