中温高黏度介质双端面主密封热力特性分析

为研究中温高黏度介质双端面机械密封主密封的传热和变形规律以及冲洗液的压力和温度对其影响,从而为密封性能改进和冲洗液的高效控制提供依据.以乳液输送设备双端面机械密封(AR201)为研究对象,建立传热计算模型,采用有限元法分析主密封温度场,研究了密封环温度和变形量随冲洗液压力和温度的变化规律.研究表明:密封环端面的最高温处于动静环接触面靠近密封腔位置处,在冲洗液的作用下,动静环内径侧温度明显低于外径侧,动静环温度自接触面开始沿轴向至环外侧逐渐降低;端面最高温度和最大变形量随冲洗液温度和压力的升高而增大,最大变形量的大小和随冲洗液参数变化的波动幅度与密封材料有关;合理选择冲洗液压力和温度是有效改善主密封性能的措施,对于AR201机械密封,将冲洗液压力控制在0.80~0.85 MPa和较低的温度能减少端面磨损现象.

Analysis of temperature and thermal deformation of main seal in double mechanical seal in medium with moderate temperature and high viscosity

To grasp characteristics of heat transfer and deformation of the main seal in a double mechanical seal in a medium with moderate temperature and high viscosity, and to understand influences caused by the pressure and temperature of flushing liquid, as well as to provide a reference for the sealing performance improvement and an efficient control on flushing liquid, an AR201 double mechanical seal for emulsion equipment is taken as the study object, then a heat transfer computational model is established, finally, the temperature field is analyzed based on finite element method, and the temperature and deformation of the sealing rings are studied when the pressure and temperature of flushing liquid varing. The results indicate that the highest temperature is near the outside of contact face of two rings, the temperature inside the stationary ring is significantly lower than outside the ring because of the cooling effect of flushing liquid, the temperature in the rotational ring reduces gradually from the contact face along the axial direction. The highest temperature and the maximum thermal deformation rise with increasing pressure and temperature. The maximum deformation and its magnitude caused from the change in flushing liquid operating parameters are closely related to the material of the rings. Properly choosing operating pressure and temperature for a flushing liquid can be a measure to effectively improve the sealing performance. As AR201 mechanical seals, the flushing liquid with a pressure in 0.8-0.85 MPa and a lower temperature can help reduce wear on the two end faces more favourably.