| The emulsion pump is the power source which is very important in miningequipment. The stability, continuity and efficiency of the emulsion pump is thethe key factor to ensure safety in production and increase profits. Theperformance of distributing valve system directly determines the efficiency ofthe whole emulsion pump station. Therefore, the emulsion pump distributingvalve system has been studied based on virtual prototype technology, whichprovides the theoretical guidance and the improved method for structure designand optimization of flat valve characteristics.In this paper, the mathematical model of emulsion pump kinematics isdescribed based on considering the hysteresis and cavitation. The ideal andactual flow model and pressure model of a single chamber is established.Then, the motion characteristic, flow fluctuations and pressure shock of theemulsion pump has been analyzed by using AMESim. The results show that: inthe early stage of suction and the end of liquid discharging, the piston chamberappeared instantaneous negative pulse about-0.2MPa; The drain valves strikelimit device acutely, while the suction valves have strong impact on the seat; Inaddition, there is a instantaneous "chatter" with amplitude about0.4mm duringthe flow valve opens to the maximum.Besides, a comprehensive analysis of the factors affecting the flow valvewith delayed response in this paper. The results show that, with the increasing of crank radius, connecting rod length, piston diameter and inlet spool mass, andthe decreasing of spring stiffness and preloading of inlet valves, closing lag ofinlet valves and opening lag of delivery valves get more serious; The openinglag of inlet valves and closing lag of delivery valves minish with the decreasingof delivery spool mass and increasing of spring stiffness of delivery valves. Thedelays were weakened as the poppet half angle and working pressure improve.The clearance volume have significant influence on the opening lag, but almosthave no effect on the closing hysteresis.Finally, the flow field of distributing valves were visualized by Fluentanalysis in order to reduce energy consumption and noise. Studies haveindicated that, there is a jet around the valve orifice with a high speed about16.7m/s, and negative pressure about-0.123MPa around the valve corner.Considering the simulation results of the pressure field, velocity field andturbulent kinetic energy diagram, the paper has improved the flow channel. Thevalve structure has been changed into arc transition. Therefore, the maximumvelocity has fell to15m/s when the arc radius is1.5mm, and the negativepressure value also has reduced to-0.05MPa, realizing the vibration and noisereduction and improving the energy utilization of the distribution system. |
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