变量叶片泵闭死容腔中压力变化特性及叶片受力分析

Pressure Variation in Sealed Cavity and Force Analysis on Vanes in Variable Displacement Vane Pumps

针对过渡区中变量叶片泵闭死容腔内部压力变化幅度大,以及高压时易引起叶片外伸困难的特点,基于MATLAB仿真软件分析了减震槽处压力分布及其对叶片顶端受力特性的影响.结果表明:开设减震槽可以有效减轻较大压差引起的液压冲击和压力突变现象,同时也减小了压力梯度的峰值;分析压力分布时计入摩擦副泄漏不仅没有降低预升/卸压效率,反而使压力梯度的峰值减小,使过渡区中的油压分布更加趋于平缓;在较高工作压力下,相对传统尖顶叶片,圆弧顶廓叶片可以有效克服在过渡区中难以外伸的缺点,同时也使叶片顶部接触反力的变化更趋于缓和.

Aimed at the characteristics of large pressure variation in sealed cavity of transition zones and difficulty in vanes＇ protraction from the rotor slot of the variable displacement vane pump, the pressure distribution around the damping groove and its kinetic effects on the vane tip were investigated through MATLAB simulation. The results show that introduction of the damping grooves can effectively reduce the hydraulic shock and pressure jump caused by large pressure difference in the pump; it also can lower the peak of pressure gradient. Consideration of the leakage at friction pairs does not reduce the efficiency of pre-pressurizing and pre-depres- surizing processes, but lowers the peak of pressure gradient and smooths the pressure distribu- tion in transition zones. Compared with the traditional spired vane, the round vane has no diffi- culty in protraction in the transition zones under high working pressure, and has smoother con- tact force change at the vane tip.