基于射流原理的柱塞泵辅助吸油技术研究

针对泵吸油不足的问题,设计了一种基于射流原理的辅助吸油装置。利用CFD软件建立了柱塞泵加入和不加入吸油装置的三维数值模型。在不同吸油口压力和油液含气量下,对柱塞泵的吸油特性进行了分析。结果表明:入口压力越低或含气量越高,泵内空化现象越严重,导致油液弹性模量越低,使得回冲阶段柱塞腔内的压力升至工作压力所需时间越长,回冲现象越剧烈,泵吸油性能也就越差。加入吸油装置后,油液流经该装置是一个增压过程,会抑制上述现象,提高泵吸油性能。从仿真结果来看,该装置具有较好的补油效果,且泵吸油性能越差,补油效果越好。

Research on the Auxiliary Oil absorption Technology for Piston Pump Based on the Jet flow Principle

In order to solve the problem of insufficient oil-absorption of hydraulic pump, an auxiliary oil-absorption device based on the jet-flow principle was designed. By using CFD software, three-dimensional numerical models of piston pump with or without this device were established. The oil-absorption characteristics of piston pump under different inlet pressure and gas content were analyzed. The result shows that the lower the inlet pressure, or the higher the gas content, the more severe the cavitation, then the elastic modu-lus of oil is lower, which increased the time of the piston chamber pressure arising to working pressure during the stage of oil back flushing and made oil back flushing more severe, so the oil-absorption performance of pump is worse. If a device was added, the flow through the device is a pressurized process, which can suppress the above phenomenon and the oil-absorption performance of pump is improved. From the simulation results, the device has a good effect of auxiliary oil-absorption, and the worse the oil-absorption perform-ance of pump, the better the effect.