扩压式自泵送流体动压机械密封综合性能研究  

Comprehensive Performance of Diffused Self-Pumping Hydrodynamic Mechanical Seal

作　　者：郑伟 孙见君[1] 马晨波[1] ZHENG Wei;SUN Jianjun;MA Chenbo(School of Mechanical and Electrical Engineering,Nanjing Forestry University,Jiangsu Nanjing 210037,China)

机构地区：[1]南京林业大学机械电子工程学院,江苏南京210037

出　　处：《摩擦学学报（中英文）》2024年第5期686-695,共10页Tribology

基　　金：国家自然科学基金项目(52075268);江苏省重点研发计划项目(BE2021062);盐城市重点研发计划(工业)项目(BE2023023);江苏省研究生科研与实践创新计划项目(KYCX22_1049)资助。

摘　　要：扩压式自泵送流体动压机械密封作为1种新的密封结构形式具有优异的密封性能和广泛的应用前景.分别设计出具有等截面型扩压环槽、发散型扩压环槽、收敛型扩压环槽和圆弧型扩压环槽4种扩压式自泵送流体动压机械密封,引入综合评价因子η,通过Fluent数值模拟分别对其综合密封性能进行了分析.基于最佳的扩压环槽结构,通过正交试验,对密封面结构参数进行优化.结果表明:等截面型扩压式自泵送流体动压机械密封综合密封性能最优;在试验参数范围内,螺旋槽数Ng和密封环外径rk对泄漏率均有影响,且螺旋槽数Ng影响最为显著.密封环外径rk和螺旋角α对开启力均有影响,其中密封环外径rk的影响更为显著,随密封环外径的增大,开启力迅速增大.依据正交试验分析结果,对密封面结构参数进行了优化,在其他边界条件均不变的情况下,新的因素水平组合得到的泄漏率最低为0.784361 ml/h,此时开启力大小为3.958962 kN.As a new form of sealing structure,the diffused self-pumping hydrodynamic mechanical seal has excellent sealing performance and a wide range of application prospects.Four kinds of diffused self-pumping hydrodynamic mechanical seals with equal-section diffuser groove,divergent diffuser groove,convergent diffuser groove and circular arc diffuser groove were designed,and the comprehensive evaluation factorηwas introduced,and the comprehensive sealing performance was analyzed through Fluent numerical simulation.Based on the optimal diffuser groove structure,the structural parameters of the sealing surface through orthogonal experiments were optimized.The results showed that the equal-section diffused self-pumping hydrodynamic mechanical seal had the best comprehensive sealing performance.Within the range of test parameters,the number of spiral grooves Ng and the outer diameter rk of the sealing ring had an influence on the leakage rate,and the number of spiral grooves Ng had the most significant effects.The outer diameter rk of the sealing ring and the helix angleαhad an influence on the opening force,among which the influence of the outer diameter rk of the sealing ring was more significant,and the opening force increased rapidly with the increase of the outer diameter of the sealing ring.According to the results of orthogonal test analysis,the structural parameters of the sealing surface were optimized,and the leakage rate obtained by the new factor level combination was as low as 0.784361 mL/h,and the opening force was 3.958962 kN under the condition that other boundary conditions were unchanged.

关 键 词：机械密封 扩压环槽 自泵送 综合密封性能 数值模拟 

分 类 号：TH136[机械工程—机械制造及自动化] TH117.1