浮杯泵柱塞副变形的有限元分析

Finite Element Analysis of Plunger Pair Deformation for Floating Cup Pump

浮杯泵独特的结构导致其泄漏点大量增加,变形后的柱塞副密封间隙成为影响其工作性能的主要因素。在泄漏间隙理论分析的基础上利用有限元软件对三组不同柱塞腔尺寸的柱塞和浮杯在上死点和下死点两种极端位置处进行受压变形仿真,讨论变形后柱塞腔的尺寸对柱塞副间隙的影响。分析得到柱塞和浮杯变形后的变化规律,以及在密封线处浮杯的变形值约为0.8μm和柱塞头的椭圆形变形趋势,对比得出在20 MPa的压力下直径为8 mm、深度为6 mm的柱塞腔能够使柱塞头的变形有效补偿浮杯的变形。

The unique structure of floating cup pump leads to a large increase of leakage point, and plunger pair sealing gap after deformation becomes a major factor affecting its performance. On the basis of theoretical analysis of leakage gap, we use the finite element software to simulate compression deformation of floating cup and plungers with three different plunger cavity sizes, at two extreme conditions of top dead center and bottom dead center, and discuss the effect of plunger cavity size on plunger pair clearance after deformation. The variation laws of plunger and floating cup after deformation are obtained, and the deformation value of floating cup at sealing line is approximately 0.8 μm, and the trend of elliptical deformation of plunger head is obtained. The result shows that a plunger cavity with a diameter of 8 mm and a depth of 6 mm under a pressure of 20 MPa can make deformation of plunger head effectively compensate for deformation of floating cup.