新型低流量脉动径向球塞泵定子曲线研究

流量脉动是影响径向球塞泵向高压高速方向发展的关键因素，针对径向球塞泵的定子曲线优化设计，是降低其流量脉动率的有效手段。基于等速曲线的特性，引入高次方过渡曲线和正弦过渡曲线设计理论，对单作用径向球塞泵定子曲线进行改进，提出曲线分段方程。对两种新型曲线影响泵流量脉动的效果进行对比评价，分析了曲线形式、过渡角度和球塞个数等主要影响因素。结果发现，采用正弦过渡曲线设计可较大幅度(20%)降低径向球塞泵的理论流量脉动率，可为低流量脉动的径向泵设计提供新思路。

Stator Curves of Novel Low-flow Pulsed Radial Ball-piston Pump

Flow pulsation is a key factor influencing development of radial ball-piston pump to high pressure and high speed. The optimization design of stator curve for radial ball-piston pump is an effective means to reduce its flow pulsation rate. On the basis of characteristics of constant velocity curve, the design theory of high power transition curve and sinusoidal transition curve is introduced to improve the stator curve of single acting radial ball-piston pump, and a new stator curve equation is proposed. The effects of the two new curves on pump flow pulsation are evaluated and compared, and main factors including curve form, transition angle and number of ball pistons, are analyzed. The results show that the sinusoidal transition curve design can significantly reduce the theoretical flow pulsation rate of radial ball-piston pump (20%), which can provide a new idea for design of low-flow pulsed radial pump.