高速涡轮泵机械密封端面温度变化规律研究
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摘要
以高速涡轮泵用机械密封为研究对象,以15~#液压油为试验介质,考虑循环冷却量、转速、介质压力以及不同摩擦副配对等因素,采用自行搭建的高速密封试验台开展端面温度变化规律的研究.结果表明:对于高速机械密封,上述因素均对端面温度产生影响,其中转速对端面温度的影响基本成线性关系,循环冷却量对端面温度的影响存在一个阈值,建议实际设计时取阈值的120%,介质压力对端面温度产生影响较大,但是影响程度不如转速;以尽可能获得低的端面温度值来判断,用作静环时浸渍树脂石墨比普通石墨合适,用作动环时碳化硅比钼合金合适.
For the mechanical seal applied in the high speed turbo pump and taking 15~# hydraulic oil as sealing medium,the experimental research on thermal change was carried out by a high speed seal test rig considering the factors(e.g.circulation cooling quantity, rotational speed, media pressure and friction pairs). The results show that the face temperature of mechanical seal was sensitive to all of above-mentioned factors. The face temperature increased linearly with increasing rotation speed. There was a threshold value of circulation cooling quantity for the face temperature and it is recommended that the circulation cooling quantity took a 120% of the threshold on practice works. Medium pressure had obvious influence on the face temperature, but was not as much as the rotational speed. To obtain low face temperature as far as possible, it is advisable to use impregnated resin graphite as stator instead of ordinary graphite and to use silicon carbide as rotor rather than molybdenum alloy.
For the mechanical seal applied in the high speed turbo pump and taking 15~# hydraulic oil as sealing medium,the experimental research on thermal change was carried out by a high speed seal test rig considering the factors(e.g.circulation cooling quantity, rotational speed, media pressure and friction pairs). The results show that the face temperature of mechanical seal was sensitive to all of above-mentioned factors. The face temperature increased linearly with increasing rotation speed. There was a threshold value of circulation cooling quantity for the face temperature and it is recommended that the circulation cooling quantity took a 120% of the threshold on practice works. Medium pressure had obvious influence on the face temperature, but was not as much as the rotational speed. To obtain low face temperature as far as possible, it is advisable to use impregnated resin graphite as stator instead of ordinary graphite and to use silicon carbide as rotor rather than molybdenum alloy.
引文
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[2]Peng Xudong,Xie Youbai,Gu Yongquan.Determinat ion of the end face temperature of mechanical seal[J].Chemical Machinery,1996,23(6):23-28(in Chinese)[彭旭东,谢友柏,顾永泉.机械密封端面温度的确定[J].化工机械,1996,23(6):23-28].
[3]Li Ding.Multi-filed coupling analysis of high speed pump mechanical seal and its structure optimization[M].Hangzhou:Zhejiang University of Technology,2017(in Chinese)[李定.高速泵机械密封多场耦合分析与结构改进[M].杭州:浙江工业大学,2017].
[4]Lebeck A O,Nygren M E,Shirazi S A,et al.Fluid temperature and film coefficient prediction and measurement in mechanical face seals-experimental results[J].Tribology Transactions,1998,41(4):411-422.doi:10.1080/10402009808983766.
[5]Gupta L A,Young L,Wondimu B,et al.Wireless temperature sensor for mechanical face seals using permanent magnets[J].Sensors and Actuators A:Physical,2013,203:369-372.
[6]Valigi M C,Braccesi C,Logozzo S,et al.A new telemetry system for measuring the rotating ring's temperature in tribological test rig for mechanical face seals[J].Tribology International,2017,106:71-77.doi:10.1016/j.triboint.2016.10.041.
[7]Takami M R,Gerdroodbary M B,Ganji D D.Thermal analysis of mechanical face seal using analytical approach[J].Thermal Science and Engineering Progress,2018,(5):60-68.
[8]Zhang Shumin,Hu Liguo,Meng Xiangkai.Analysis of a mechanical seal for superspeed gas turbopump[J].Fluid Machinery,2012,40(10):23-27(in Chinese)[张淑敏,胡丽国,孟祥铠.超高速燃气涡轮泵机械密封的分析与研究[J].流体机械,2012,40(10):23-27].doi:10.3969/j.issn.1005-0329.2012.10.006.
[9]Hu Yafei,Liu Qi,Jiang Wenwu,et al.Study of friction and wear properties on three kinds of antimony impregnated graphite[J].Journal of China Coal Society,2011,36(2):351-354(in Chinese)[胡亚非,刘颀,蒋文武,等.3种浸锑石墨材料的摩擦磨损性能试验研究[J].煤炭学报,2011,36(2):351-354].
[10]Wang Q L,He M,Li X C,et al.Preparation and properties of graphite/antimony composites based on coal tarpitch[J].Advanced Composites Letters,2017,26(2):49-55.