双斜盘阀配流轴向柱塞式液压电机泵配流特性和变量原理的研究

Research on the Flow Distribution Characteristics and Variable Principle of the Double-swashplate Hydraulic Axial Piston Electric Motor Pump with Port Valves

提出一种有别于常规阀配流泵的'斜盘转动而缸体不动'而采用缸体和配流阀一起旋转的双斜盘阀配流轴向柱塞式液压电机泵。建立该泵配流机构的数学模型,研究各种结构参数和工作参数对配流特性的影响,尤其是配流阀芯所受离心力对配流特性的影响。以仿真模型和得出的单个柱塞腔的压力响应曲线和输出流量曲线为基础,研究该类型泵流量脉动和侧向力脉动的特点,得出随着泵的工作转速增加,流量脉动和侧向力脉动都增大,当柱塞数量足够多时,柱塞数量的奇偶性在影响流量脉动上没有明显的区别,偶数个柱塞比奇数个柱塞产生的侧向力脉动要大。提出一种新型的阀配流轴向柱塞泵的变量调节方式,并研究该变量方式的原理和调节特性。样机泵的试验结果表明该泵的工作原理可行,进而展望双斜盘阀配流轴向柱塞式液压电机泵的应用前景。

A kind of double-swashplate hydraulic axial piston electric motor pump with port valves is presented where cylinder is rotating along with the port valves, which is different from the conventional port-valving pump with the swashplate rotating and the cylinder mounted in the casing. The mathematic model of the pump flow distribution mechanism is established to study the effect of various structural parameters and operating parameters on the flow distribution characteristics, especially the effect of centrifugal force on the flow distribution characteristics of the poppet valve. Based on the simulation model and the pressure response curve and output flow curve of a single plunger chamber, the characteristics of the flow ripple and lateral force fluctuation of this type of pump are investigated. It turns out that large rotation speed of the pump will lead to the increase of flow pulsation and lateral force pulsation. The odevity of piston number has no obvious influence on the flow pulsation when piston number is large enough. And, even number of piston will produce larger lateral force pulsation than odd number of piston. A new principle of varying the displacement of axial piston pump with port valves is proposed, and regulating characteristics of the variable mode are studied. The experimental results of the prototype pump show that the operation principle of the pump is feasible and the application prospect of the double-swashplate hydraulic axial piston electric motor pump, or pump with port valves is forecast.