| Mining centrifugal pumps have low hydraulic efficiency and poor reliability due to unbalanced axial force and energy loss,and are affected by the transport capacity of the shaft and the space conditions of the roadway.Centrifugal pumps with high lift,large flow,and high power development is limited.Based on the above problems,this thesis designs a dual-motor-driven self-balancing multistage centrifugal pump based on the theory of parallel characteristics of water pumps.The influence of performance,and the research on the mechanical performance of the rotor under the dual-motor drive mode,by building an experimental test platform,the external characteristic results of the test and the simulation results are compared and analyzed.Its main research contents are as follows:(1)According to the design requirements,the design scheme of the dual-drive selfbalancing multistage centrifugal pump was determined,the hydraulic design of the main flow-through parts of the pump body was completed by using the flow theory,and the two-dimensional and three-dimensional hydraulic models of the pump were constructed by comprehensively using CAXA,PCAD,CFturbo and Solidworks software.(2)Based on the ANSYS software,the hybrid mesh division of the model pump and the numerical simulation of the pump performance are carried out to explore the pressure distribution and velocity distribution of the double-drive self-balancing multi-stage centrifugal pump.The pressures cancel each other,which can reduce the axial force caused by the uneven pressure distribution on both sides;the fluid flow rate in the pump is uniform,and there is almost no vortex,and the maximum flow rate appears in the thirdstage impeller and the radial guide vane positive guide vane At the intersection,it is34.39m/s.(3)According to the characteristics of dual water inlets of double-drive selfbalancing multistage centrifugal pumps,a water inlet balancing device is designed.Taking the distance between the center of the balance water pipe and the outlet of the water inlet balance device and the diameter of the balance water pipe as design variables,5 groups of different test schemes were constructed by using the method of equal interval control variables to explore the changing law of the influence on the performance of the water absorption chamber.Through the test optimization scheme,the results show that after optimization Compared with the scheme before optimization,the maximum cavitation volume fraction of the water absorption chamber is reduced by 5.4%,and the degree of cavitation is significantly reduced,and the cavitation performance is significantly improved.(4)Using the ANSYS Static Structural module,the structural static simulation calculation of the pump rotor part is carried out,and the fatigue and torsional strength of the pump shaft are checked.Using the ANSYS Modal and Modal Acoustics acoustic simulation modules,the dry mode and wet mode simulation calculations of the pump rotor components are carried out to verify that the rotor speed meets the critical speed requirements.The ANSYS Harmonic Response module is used to analyze the harmonic response of the reasonable unbalanced force generated by the double-drive structure of the pump when the speeds of the motors at both ends are not synchronized.(5)The simulation analysis of the external characteristics of the double-drive selfbalancing multi-stage centrifugal pump was carried out,and the performance test platform of the water pump was built,and the experimental test was compared with the theoretical simulation results of the external characteristics.The error of the result is less than 4%,which verifies that the dual-drive self-balancing multistage centrifugal pump meets the design requirements. |
