新型低速大扭矩内曲线柱塞泵空化特性分析

Analysis of Cavitation Characteristics of a Novel Low-speed High-torque Internal Curve Piston Pump

为了研究一种新型低速大扭矩内曲线柱塞泵的内流域空化特性,建立了内曲线柱塞泵的配流体内流域模型,通过CFD流体仿真对配流体流域的空化分布和产生进行研究。分析了不同工况参数对配流体流域空化特性的影响。研究表明:空化主要发生在排油单向阀阀口和高速开关阀阀口,气相体积分数直接反应空化的剧烈程度,泵轴转速和负载压力对于空化的影响明显,但过低的吸油压力会导致柱塞发生吸空。通过增大流道局部内径和缩小流道长度两种不同方式对配流体内流域结构进行优化,以此减小油液流速,进而削弱空化现象,优化方式较好。

In order to investigate the internal basin cavitation characteristics of a novel low-speed high-torque internal curve piston pump,the internal drainage model of the fluid distribution of the internal curve piston pump is established.The cavitation distribution and generation in the fluid distribution basin are studied by CFD fluid simulation.The cavitation characteristics of the fluid distribution basin under different conditions are analyzed.The research findings demonstrate that cavitation mainly takes place at the oil discharge non-return valve port and the high-speed on-off valve port,and the gas phase volume fraction directly reflects the intensity of cavitation.Pump shaft speed and load pressure have an obvious effect on cavitation,however,too low oil suction pressure will cause the piston to suck air.The structure of fluid distribution internal basin is optimized by increasing the local inner diameter of the flow path and reducing the length of the flow path,thereby reducing the oil flow rate and weakening cavitation.The latter optimization method is superior to the former.