PEEK旋转密封环密封性能仿真和试验研究

Simulation and Experimental Study on Sealing Performance of PEEK Rotary Seal Ring

为研究低刚度胀圈型旋转密封环的接触状态和密封性能,以聚醚醚酮(PEEK)材料的无槽环和V形槽环两种密封环为研究对象,基于COMSOL有限元软件建立了旋转密封流固耦合模型,对密封状态进行了模拟分析,并在试验台上测试了密封环的摩擦转矩和漏率.仿真结果表明:在载荷作用下,密封环的变形显著影响密封面接触压力和流体压力分布.试验结果表明:由于槽区流体的静压承载作用,V形槽环的摩擦转矩比无槽环小40%左右,但由于端面开槽减小了局部径向密封宽度,V形槽环漏率比无槽环大10%左右.另外,两种环的摩擦转矩随转速增加均没有下降趋势,说明在试验条件下密封面动压减摩效果不显著.研究结果有助于进一步认识胀圈型旋转密封环的密封机理,指导新型密封环的设计.

In order to study on contact state and sealing performance of low-stiffness expanding rotary seal ring,two kinds of seal rings,untextured ring and V-shape grooved ring,were investigated.A fluid-structure coupling model for the rotary seal rings was developed,based on the finite element analysis software COMSOL,and the sealing state was analyzed.Also,friction torque and leak rate of the seal rings were tested on a test rig.Simulated results showed that,under external loads,the deformation of PEEK seal rings significantly influenced the distribution of contact and fluid pressure on the sealing faces.Experimental results showed that,due to hydrostatic load carrying in grooved area,the friction torque of V-shape grooved ring was about 40% lower than that of untextured ring,whereas the leak rate was 10% more owing to the reduction of local radial sealing width.The friction torque of neither rings decreased with rotational speed,indicating no obvious hydrodynamic friction reduction on the end face of the seal rings under test conditions.The research results provided further understanding of the sealing mechanism of the expanding rotary seal ring and guide the design of new seal rings.