Study On Key Technology Of High-speed Pump

High-speed pump is used for conveying occasions with high-lift medium.It has been widely used in water supply and drainage engineering,petrochemical industry,energy,aerospace and production activities in various sectors of the national economy in recent years.The stability of high-speed pump is very important in the process of operation.The thrust bearing is the key to affect the stability of high-speed pump.Therefore,it is urgent to study the load performance of the thrust bearing.Based on hydrodynamic lubrication theory,the load performance of the improved thrust bearing in high-speed centrifugal pump is studied using the CFD method.Firstly,the hydrodynamic lubrication bearing mechanism and the basic theory of control equations are discussed,and the application of CFD method in fluid simulation is introduced.Then the fluid computational domain model of the thrust bearing is established,and the pretreatment process is explained by grid partition,boundary condition setting and physical model selection.With the basis of the above work,the influence of structure parameters of the double tapered-land thrust bearing,lubricant film thickness and rotational speed on the load performance are studied,and analyzed their changing rule.The load performance of the improved thrust bearing is compared with the traditional tapered-land thrust bearing.Secondly,the influence of the structure parameters of annular groove on the load performance is studied in annular groove slope-platform thrust bearing.Finally,in this paper,the modal vibration type and the critical speed of the input shaft and the high-speed shaft are analyzed using the SAMCEF Rotors software.The purpose is to avoid the resonance of the shafting in the process of operation,and the resonance will affect the normal operation of the equipment.