Suction Cavitation and Suppression of High-speed Gear Pump
In order to reveal the development laws of cavitation during high-speed operation of gear pumps,the oil suction characteristics of high-power dual gear pump for wheel loaders were studied.The effects of speed and suction pressure on the cavitation and output flow characteristics of the dual gear pump were analyzed through full flow field simulation and test.The results show that the critical speed for significant cavitation in the dual gear pump is 2400 r/min.When the speed exceeds 2400 r/min,the gas content inside the pump increases sharply,which has serious impact on the continuity and stability of the output flow.The critical suction pressure of the dual pump is 0.19 MPa and the output flow pulsation will increase if the suction port pressure continues to increase.The critical suction pressure of the dual gear pump is 0.19 MPa.If the suction pressure is continued to increase,the flow pulsation of the pump would be also increased.Compared with the suction pressure of 0.1 MPa and 0.19 MPa,when the suction pressure at 0.19 MPa,the gas volume fraction of gear pair 1 and gear pair 2 decreases by 0.059 and 0.067 respectively,and the effective flow rate increases by 7.96％and 9.24％,respectively.By appropriately increasing the inlet pressure of the pump,there is a significant improvement effect on the suppression of cavitation and the improvement of effective flow rate in gear pump,which has positive engineering practical significance.
万方数据
维普
