Calculation Of Axial Force Of Cantilever High Pressure Centrifugal Pump And Analysis Of Its Influencing Factors

The size of the axial force directly restricts the safe and stable operation of the centrifugal pump and the service life of the pump.In the design of the centrifugal pump,the size of the axial force is a factor that must be considered.There is still a lack of theoretical research on the influencing factors and mechanism of the axial force of centrifugal pumps,and it is still impossible to accurately calculate the magnitude of the axial force.In the face of many balancing devices,it is still difficult to give an accurate answer on how to choose the balancing axial force.Therefore,in this paper,the calculation of the axial force of the centrifugal pump itself and the analysis of the influencing factors are studied.The main work is as follows:1.Using formulas and numerical simulation to calculate the axial force of the pump,it is concluded that when the inlet pressure is constant at normal pressure,the flow rate increasing,using formulas and numerical simulation to calculate the axial force are in good agreement;when the flow rate is constant at 1.0Q,the inlet pressure increasing,the difference between formulas and numerical simulation is very large.It is further concluded that When the inlet pressure is low pressure,the formula is suitable for calculating the axial force of centrifugal pump.The form,ula is not applicable when the inlet pressure is high pressure.The inlet pressure is low pressure or high pressure,and the numerical simulation is applicable.2.The influence of flow rate,inlet pressure and rotational speed on the axial force of centrifugal pump is studied.Under certain other conditions,the numerical calculation of the axial force under different flow rates,different inlet pressures and different rotational speeds is carried out,and the internal flow field of each part of the axial force is analyzed.The results show that the axial force of centrifugal pump decreases when the inlet pressure is constant,while the inlet pressure decreases when the inlet pressure and flow rate are constant.When the inlet pressure and flow rate are constant,the axial force of centrifugal pump increases with the increase of rotational speed3.The influence of the axial clearance width of the pump chamber on the axial force.Under certain other conditions,the axial forces of different pump chambers with axial clearances(8.95 mm,18.95 mm,28.95 mm,38.95 mm,48.95 mm)are calculated numerically.The pressure and velocity distributions on the outer wall of the impeller cover plate and the flow field inside the pump chamber are analyzed emphatically.The results show that when the flow rate and inlet pressure are constant,the axial clearance of pump chamber increases,the total axial force F of centrifugal pump decreases first and then increases,and the axial force F is the smallest at the axial clearance of pump chamber at 18.95 mm.In engineering practice,the axial force of the pump can be balanced by changing the inlet pressure or adjusting the axial clearance width of the pump chamber and cooperating with other methods of balancing the axial force.