螺旋槽水润滑橡胶合金轴承沙粒侵蚀磨损研究

螺旋槽水润滑橡胶轴承橡胶面的破坏除了与运动轴直接接触造成磨损外,水中泥沙颗粒等污染物对水润滑橡胶的侵蚀磨损也是影响水润滑橡胶工作面的主要破坏方式。对液-固两相流中固体颗粒的受力情况进行分析;借助于Finne磨损基本数学模型,对不同转速、不同大小沙粒和水组成的流场进行分析,得到内部颗粒随液态流场变化的趋势;对中高转速下颗粒对壁面磨损的过程和位置进行初步的预测。结果表明,在不同转速下,不同粒子对橡胶面不同位置的侵蚀磨损是显著不同的:低转速下,接近层流状态时,对承载面的磨损较大;高转速下,流体呈现紊流状态,并在导流槽内出现独立的漩涡现象,导致颗粒在漩涡内聚集,从而造成漩涡面的磨损侵蚀较大。螺旋槽结构导致流场内漩涡出现,对于排污具有较好的作用。

Research on Erosion Wear to Water Lubricated Spiral Groove Rubber-Alloy Bearing Caused by Sand Particles

Except for wear of direct contact with the shaft,the erosion wear caused by sand and other contaminate particles is the main failure mode for the surface of rubber water-lubricated-bearing.The forces applied on the solid particles in liquid-solid two-phase flow were analyzed.Based on the Finne wear basic mathematic model,the flows of sand particles with different size under different rotation speed were simulated in ANSYS CFX,and the basic movement trend of particles in the flows was obtained.The whole wear process and position of sand particles to the rubber surface at medium and high speed were predicted.The results show that the erosion wear is significantly different with different speed,different particles and different positions of rubber surface.Under low speed conditions,wear appears in the main surface of loading;under high speed conditions,the water presents turbulent state,independent vortex appears apparently in the spiral groove,which causes particles gathered inside and larger erosion wear in the grooves.The arcs between the groove and main surface of loading are always first wear-out,so optimization design for the shape of the arc will be benefit for the long life and reliability of the water lubricated bearing.