中文摘要：

液压电机泵利用油流在壳体内的流动带走工作过程中产生的热量,由此会增加主泵吸油阻力,影响主泵充分吸油.研制出的液压电机泵通过在主泵前设置孔板离心泵以解决此矛盾,通过对液压电机泵与同规格电机液压泵组的试验结果进行对比分析,同时结合不同转速下液压电机泵内吸油流场的仿真计算结果,获得转速对主泵吸油流场的影响规律.研究发现,孔板离心泵可以明显促进主泵充分吸油,孔板离心泵出口（主泵吸油腔进口）总压最大值随其转速升高呈近似线性增加的趋势,与电动机液压泵组相比电机泵容积效率高1.25％左右.当孔板离心泵转速低于1 395 r/min后,会对主泵吸油产生不利影响,当输出压力升高至22 MPa时,液压电机泵容积效率相对降低2.7％.总结给出增压效应的确切含义.

英文摘要：

The suction flow resistance rises in the electric motor-pump due to the flow of cooling oil through the suction channel to take away the heat,which affects the sufficiency of oil suction.To solve this problem,a port-plate centrifugal pump is placed in front of the main pump.The experiment of the electric motor-pump and the electric-hydraulic power unit with equal power is done and the flow field simulation of suction channel for different rotational speed is calculated,the influence rule of rotational speed on main pump suction flow field is obtained.The research results show that the suction performance of the main pump is evidently improved by the port-plate centrifugal pump and the maximum value of the total pressure on the outlet port of the port-plate centrifugal pump （the inlet port of the main pump） almost increases linearly with the increase of rotational speed.The volumetric efficiency of the electric motor-pump is nearly 1.25％ higher than that of the electric-hydraulic power unit.When the rotational speed is below 1 395r/min,the port-plate centrifugal pump causes an adverse impact on the suction performance of the main pump.The volumetric efficiency relatively decreases by 2.7％ with the delivery pressure rising to 22 MPa.The exact meaning of charging effect is summarized.