| Bayer Material Science and Technology (China) Co., Ltd use two types of SLM-NHO series magnetic pumps to transport hot oil. However, in the course of operation, it is found that the journal bearing and thrust bearing of such magnetic pumps often have the failures of wearing and tearing which make the magnetic pump stop. This thesis analyzed the causes of such failures based on the numerical study of the lubrication performance of bearings and the surface morphology test, and then put forward suggestions for improvement.The main research contents and achievements of this thesis include:The overall structure and working principle of two kinds of SLM-NHO series of magnetic pump rotor are analyzed. The mechanical analysis of the main structure of the support rotor is carried out, and the variation of the load along with the speed of every journal bearing and thrust bearing are calculated. Using Reynolds equation, the dimensionless oil film pressure calculation method for the journal bearing and thrust bearing of two kinds of magnetic pump is established. By MATLAB programming, the oil film pressure and the load carrying capacity of the journal bearing and thrust bearing are obtained. The relation of the change of the film thickness with the speed is obtained. The roughness values of the journal bearing and thrust bearing are measured by using the JB-5C precision roughness measuring instrument. According to the film thickness ratio, the present condition and the lubrication state at different speeds of the two types of magnetic pump are analyzed. The reasons for the failure are pointed out, and the improvement suggestions are put forward.The research results of this thesis can not only provide the theoretical guidance for the improvement of two kinds of magnetic pump used in Bayer Material Science and Technology (China) Co., Ltd. but also provide reference for the failure of other magnetic pump bearings. |
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