恒压变量泵在混凝土泵液压系统中的吸空研究

Research on air suction of constant pressure variable displacement pump in hydraulic system of concrete pump

文章分析了摆动系统的工作原理,对恒压变量泵进行理论研究、数学建模和仿真发现,摆动油缸间歇式动作造成泵斜盘角度的高频变化,致使吸油管路出现流速突变从而产生压力波,压力波往复传播使油液压力低于空气分离压从而产生大量气穴,是导致油泵吸空损坏的主要原因。同时,提出了一种在变量缸进油口处设置阻尼孔以减小流速突变的方法,AMESim仿真及试验结果表明此法对减少油泵的吸空具有一定效果。

The working principle of swing system is studied. Based on the theoretical analysis, mathe- matical modeling and simulation of constant pressure variable displacement pump, it is concluded that the high-frequency variation of swash-plate angle due to the intermittent motion of the swinging oil cylinder and its resultant sudden change of flow velocity of oil in the suction pipeline cause pressure wave, and the transmission of pressure wave makes the oil pressure below that of air separation and cavitation, resulting in the air suction of pump. And a novel method to reduce this sudden change of flow velocity by adding damping orifices to the oil inlets of variable cylinder is presented, which is ver- ified to be effective in reducing the air suction of pump by AMESim simulation and test.