An approximate analytical method of gas film pressure in non-parallel gap of spiral groove dry gas seal
SONG Pengyun1, LI Ying2, MA Ailin1
1.Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; 2.South China Branch, Sinopec Sales Co. Ltd., Kunming, Yunnan 650500, China
Abstract:To study the distribution of gas film pressure of deformed spiral groove dry gas seal, an approximate analytical method of the gas film pressure in the non-parallel gap is presented, which stems from the narrow groove theory improved by MUIJDERMAN. An example is presented, and compared with the situation of the parallel gap. The results show that there will be a radius of R, where the pressure of the gas film is the same before and after the deformation. When the gap is divergent(A-shaped), the film pressure decreases in the area of r smaller than R, and the film pressure increases in the area of r greater than R. With θ increasing, the minimum gas film thickness(hmin)decreases, and leakage(m)increases. When the gap is convergent(V-shaped), the film pressure increases in the area of r smaller than R, and decreases in the area of r greater than R. With θ increasing,the minimum gas film thickness(hmin)and leakage(m)decrease first and then increases.
宋鹏云, 李英, 马爱琳. 螺旋槽干气密封端面非平行间隙压力分布的近似解析计算[J]. 排灌机械工程学报, 2015, 33(12): 1049-1055.
SONG Pengyun, LI Ying, MA Ailin. An approximate analytical method of gas film pressure in non-parallel gap of spiral groove dry gas seal. Journal of Drainage and Irrigation Machinery Engin, 2015, 33(12): 1049-1055.
[1]南小妮, 周昆颖, 张秋翔,等. CFD 软件对螺旋槽干气密封的模拟[J]. 化工设备与管道,2005,42(4):56-58. NAN Xiaoni, ZHOU Kunying, ZHANG Qiuxiang,et al. Simulation of spiral groove dry gas seals by use of CFD[J]. Process equipment & piping, 2005,42(4):56-58.(in Chinese)[2]蒋小文,顾伯勤. 螺旋槽干气密封端面间气膜特性[J].化工学报,2005,56(8):1419-1425. JIANG Xiaowen, GU Boqin. Characteristic of gas film between spiral groove dry gas seal faces[J]. Journal of chemical industry and engineering, 2005, 56(8): 1419-1425.(in Chinese)[3]江锦波,彭旭东,白少先,等. 仿鸟翼微列螺旋槽干气密封性能分析与选型[J]. 摩擦学学报, 2015,35(3):274-281. JIANG Jinbo,PENG Xudong, BAI Shaoxian, et al. Performance analysis and selection of a bionic birdwing multi-array spiral groove dry gas seal[J].Tribology, 2015, 35(3):274-281.(in Chinese)[4]MULLER H K,NAN B S. Fluid sealing technology: principles and applications [M]. New York:Marcel Dekker, Inc, 1998.[5]彭旭东, 冯向忠, 胡丹梅,等. 非接触式气体润滑密封变形的数值分析[J].摩擦学学报,2004(6):536-540. PENG Xudong, FENG Xiangzhong, HU Danmei, et al. Numerical analysis of dedormation of a non-contacting gas lubricated seal[J]. Tribology, 2004(6):536-540.(in Chinese)[6]蔡永宁,潘晓梅,彭旭东.激光加工多孔端面机械密封变形的数值分析[J].润滑与密封,2007(2): 81-85. CAI Yongning, PAN Xiaomei, PENG Xudong. Numerical analysis of deformation of a laser surface textured mechanical seal[J]. Lubrication engineering, 2007(2): 81-85.(in Chinese)[7]苏虹,丁雪兴,张海舟,等. 力变形下螺旋槽干气密封气膜流场近似计算及分析[J]. 工程力学,2013,30(S1): 279-283. SU Hong, DING Xuexing, ZHANG Haizhou, el al. Gas membrane flow field approximate calculation and analysis of spiral groove dry gas seal on the force distortion[J]. Journal of engineering mechanics,2013, 30(S1): 279-283.(in Chinese)[8]陈侃, 黄泽沛, 姚进,等. 不等温假设下的螺旋槽干气密封端面气膜压力分布计算[J]. 排灌机械工程学报, 2013,31(7):605-610. CHEN Kan, HUANG Zepei, YAO Jin, et al. Approximately estimating pressure distribution in gas lubricated spiral groove face seal under non-isothermal conditions[J]. Journal of drainage and irrigation machinery engineering,2013,31(7):605-610.(in Chinese)[9]王选盈, 郝木明. 锥度对螺旋槽气体端面密封稳态特性的影响 [J]. 润滑与密封, 2006(3):129-132. WANG Xuanying, HAO Muming. Influence of the coning on the steady-state behavior of spiral groove gas face seals[J]. Journal of lubrication engineering,2006(3): 129-132.(in Chinese)[10]许静. 螺旋槽干气密封高压端面变形机理的理论与实验研究[D]. 杭州:浙江工业大学,2014.[11]宋鹏云. 螺旋槽干气密封端面气膜压力计算方法讨论[J].润滑与密封, 2009, 34(7):7-9. SONG Pengyun. Discussion about the calculation me-thods of the gas film pressure of the spiral groove dry gas seals[J]. Journal of Lubrication Engineering, 2009, 34(7):7-9.(in Chinese)[12]MUIJDERMAN E A.Spiral groove bearings[M].New York: Springer-Verlag, 1966.[13]顾永泉.机械密封实用技术[M]. 北京:机械工业出版社, 2001.[14]王和顺,陈次昌,黄泽沛,等. 干气密封端面平衡间隙的研究[J]. 润滑与密封. 2007, 32(8): 16-18. WANG Heshun, CHEN Cichang, HUANG Zepei, et al. Research on the balance clearance of dry gas seal[J]. Journal of lubrication engineering, 2007, 32(8): 16-18.(in Chinese)[15]GABRIEL R P.Fundamentals of spiral groove non-contacting face seals [J].Lubrication engineering, 1994,50(3):215-224.[16]尹晓妮.中低转速螺旋槽干式气体端面密封的数值分析[D].青岛:中国石油大学(华东), 2006[17]李英.螺旋槽干气密封自对中机制及其实现方式研究[D].昆明:昆明理工大学, 2014.