李子贤,张东胜,张禹,李双喜
LI Zi-xian,ZHANG Dong-sheng,ZHANG Yu,LI Shuang-xi

• 1:北京化工大学

摘要(Abstract)：

针对现有磁脂密封密封能力有限、运行时极靴易与转轴发生刚性磕碰;而刷式密封摩擦生热较大、不能实现零泄漏等问题,综合磁脂密封与刷式密封的特点,提出了新型柔性极靴磁脂密封。利用GAMBIT和FLUENT软件建立柔性极靴磁脂密封的数值分析模型,对比分析了柔性极靴磁脂密封理论上的温度场分布以及磁脂温升规律等传热特性。结果表明:密封的接触线速度、柔性丝的直径、排列倾角和安装过盈量都会对磁脂温度变化产生一定的影响;排列倾角和安装过盈量对磁脂温升的影响有限。由于涂层厚度过小,改变涂层材料,对磁脂温度的影响较小。此外,建立了柔性极靴磁脂密封试验系统,验证了随着转轴转速的增加,柔性极靴密封功耗和磁脂温度会有明显的上升。
With regard to existing problems of current magnetic grease seal and brush seal such as low bearing pressure ability,pole piece bumps against spindle frequently,biggish friction heat and necessary leakage,combining adventages of magnetic grease seal and brush seal,new Magnetic Grease Seal with Flexible Pole Piece( MGS-FPP) is presented. FEM model for MGS-FPP was set up by GAMBIT and thermal field of seal,temperature of magnetic grease and heat transfer characters were relatively studied in theory. The result shows that sealing contact line speed and the diameter of the flexible pole piece have effect on the temperature change,while arrangement angle and installation interference exerts an limited impact on the temperature rise. Due to thin coating,changing coating material has little influence on temperature of magnetic grease. In addition,test system for MGS-FPP was also established and it is verified that with the shaft speed increasing,the power consumption and the temperature of magnetic grease significantly rise.

关键词(KeyWords)： 磁脂密封;柔性极靴;磁场分布;磁脂温升
magnetic grease seal;flexible pole piece;magnetic field distribution;magnetic grease temperature

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展计划973项目(2012CB026000)

作者(Author): 李子贤,张东胜,张禹,李双喜
LI Zi-xian,ZHANG Dong-sheng,ZHANG Yu,LI Shuang-xi

参考文献(References)：

• [1]吴露,张秋翔,蔡纪宁.特种磁脂密封的寿命试验研究[J].润滑与密封,2013,38(5):60-63.
• [2]吴飞飞.新型脂基磁流体密封的性能研究[D].北京:北京化工大学,2012.
• [3]吴飞飞,蔡纪宁,张秋翔.磁性润滑脂密封温升及功率损耗的实验研究[J].润滑与密封,2012,37(3):59-63.
• [4]李德才,袁祖贻.磁流体密封齿型的理论分析与实验[J].流体机械,1994,23(12):3-7.
• [5]Mitamura Y.A magnetic fluid seal for rotary blood pumps:image and computational analyses of behaviors of magnetic fluids[C].35th Annual International Conference of the IEEE EMBS.Osaka Japan:IEEE,2013:663-666.
• [6]Ruggiero E J,Allen J,Lusted R M.Heat generation characteristics of a carbon fiber brush seal[C].In:44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit.USA:AIAA,2008,1-12.
• [7]郑小荣,杨逢瑜,骆明辉.磁流体密封压力及动密封粘滞功耗确定[J].石油化工设备,2002,31(3):13-15.
• [8]池长青,王之珊,赵丕智.铁磁流体力学[M].北京:北京航空航天大学出版社,1993.
• [9]顾红,徐伟华.旋转速度对磁流体密封能力的影响研究[J].流体机械,2002,30(1):4-7.
• [10]王为伟.刷式密封特性研究及影响因素分析[D].北京:北京化工大学,2011.
• [11]李亨,张锡文,何枫.论多孔介质中流体流动问题的数值模拟方法[J].石油大学学报,2000,24(5):111-116.
• [12]邱波,李军,冯增国.两级刷式密封泄漏特性的实验与数值研究[J].西安交通大学学报,2013,47(7):7-12.
• [13]许洋.磁脂密封磁场与传热数值研究[D].北京:北京化工大学,2010.
• [14]刘启光,马连湘,邢志有.化工物性算图手册[M].北京:化学工业出版社,2002.
• [15]陈汇龙,刘彤,林清龙,等.基于ANSYS接触式机械密封热力耦合的研究[J].流体机械,2012,40(7):29-32.
• [16]Zhao H,Stango R J.Role of distributed interbristle friction force on brush seal hysteresis[J].Journal of Tribology,2007,129(1):199-204.
• [17]霍丽萍,安琦,蔡仁良.磁流体密封压力的计算与实验研究[J].流体机械,1999,27(4):7-9.