热力变形下渣浆泵机械密封干摩擦磨损分析

Wear Analysis for Mechanical Seal of Slurry Pump Under Dry Friction Based on Thermal Mechanical Deformation

机械密封在起停阶段或操作失误时常处于干摩擦状态,由此导致的热损伤与磨损将影响其密封性能。以某YWN8合金接触式机械密封为研究对象,建立基于硬度及磨损系数的磨损数值模型,试验测定摩擦副密封环的硬度、磨损系数、干摩擦因数,验证磨损数值模型的准确性;对机械密封磨损进行仿真模拟,研究摩擦副密封环在干摩擦运转时单力场及热力变形下的磨损深度,并用磨损理论值进行验证。结果表明:干摩擦运转时密封环端面温升较低,温度不是其失效的主要原因;热力变形后密封环内外径间隙增大,造成端面粗糙峰接触面积减小,黏着磨损较变形前呈下降趋势,导致多物理场下的磨损深度与理论值不符。

Mechanical seal was often in dry friction state during start-up and stop stage or misoperation,and the resulting thermal damage and wear will affect its sealing performance.Taking a YWN8 alloy contact mechanical seal as the research object,a wear numerical model based on hardness and wear coefficient was established.The hardness,wear coefficient and dry friction coefficient of the seal ring of the friction pair were tested,and the accuracy of the wear numerical model was verified.The wear of mechanical seal was simulated,and the wear depth of seal ring of friction pair under single force field and thermal deformation during dry friction operation was studied,and the result was verified by wear theoretical value.The results show that the temperature rise of the end face of the seal ring is low during dry friction operation,and the temperature is not the main reason for its failure.After the thermal mechanical deformation,the clearance between the inner and outer diameter of the sealing ring increases,resulting in the reduction of the contact area of the rough peak of the end face,and the adhesive wear shows a downward trend compared with that before deformation,resulting in the wear depth in multiple physical fields inconsistent with the theoretical value.