正开口配流盘轴向柱塞变量泵输出特性预测

Flow Characteristics Prediction on Axial Variable Piston Pump with Cross Porting Valve Plate

为了准确地预测正开口式斜盘轴向柱塞泵的流动特性,通过对单个柱塞的运动特性、过流面积、密封带、泄漏等重要影响因素进行分析。在此基础上,用MATLAB编程建立柱塞以及柱塞泵的流动特性方程,并且绘制过流面积曲线和密封带曲线。在输入结构参数后对柱塞泵流动特性进行仿真和分析,得到在不同转速以及压力条件下的泵的输出流量特性。通过比较分析可知,配流副之间的泄漏、滑靴副之间的泄漏、柱塞副之间的泄漏和三角槽的流量损失是影响柱塞泵容积效率的关键因素。当柱塞泵的出口压力增大时,泵的输出流量会有略微的下降,流量不均匀系数增加,容积效率下降,主要原因是由于出油口压力的增大使得摩擦副之间的泄漏量以及三角槽损失的流量增加。

In order to accurately predict the flow characteristics of the axial variable piston pump with cross porting valve plate,through the analysis of the movement characteristics,flow area,sealing belt,leakage and other important factors of a single piston.On this basis,use MATLAB programming to establish the flow characteristics equation of the single piston and the piston pump,and drawing the flow area curve and the sealing belt curve.After inputting the structural parameters,the flow characteristics of the piston pump are calculated and analyzed,then getting the flow characteristics of the pump under different speed and pressure conditions.Through comparative analysis,it can be seen that the leakage between the valve pairs,the leakage between the slipper pairs,the leakage between the piston pairs and the flow loss of the triangular groove are the key factors affecting the volume efficiency of the piston pump.When the pressure of the piston pump increases,the flow of the pump will slightly decrease,the flow pulsation coefficient increases,and the volume efficiency decreases,the main reason is that the increase of oil outlet pressure increases the leakage between friction pairs and the flow loss of triangular groove.