SDZ310型超高压多级离心泵的结构特性
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摘要
针对目前多级离心泵转子轴向力难以平衡以及级间密封长期运行易损坏的问题,通过对SDZ310型超高压多级除磷泵的结构特性进行研究,设计了一种节段式自平衡双壳体多级离心泵.该泵的转子部件上叶轮对称布置,自动平衡转子部件上的轴向力,使其具有较长的寿命和可靠的运行性能.特别解决了除磷泵在除磷工况下运行时,由于频繁变化的工况导致的转子部件的轴向力频繁变化,进而使其难以平衡的难题.通过一种带节流阀式的集中式供油及回油系统,使得该泵能够满足长时间运行时的润滑和冷却的需求.采用由镀铬精密研磨而成的螺旋反抽密封,能够保证该泵在运转过程中级间无泄漏,保证泵的容积效率,进而提高了整机效率.
Functioning as an core equipment in high-pressure water systems,the ultrahigh-pressure multistage centrifugal pump( UPMCP) has been widely applied in industries such as metallurgy,chemical,petroleum and electric power sectors. However,there is a difficulty in axial thrust balance on the rotor in UPMCPs and the seals between stages are damaged easily after a long period of operation experienced currently. In this paper,Structural characteristics of UPMCPs for phosphorus removal were studied and analyzed,and then a axial thrust self-balanced type SDZ310 UPMCP with double cases was developed. The impellers were symmetrically arranged on the pump rotor to make the axial thrust on the rotor self-balanced to extend pump life-span and strength the operation ability of pump. In consequence,the difficult problem of balancing frequently varied axial thrust,which was caused from constantly variable operation conditions in phosphorus removal services,was solved. A centralized oil supply and return system with check valves was integrated into the pump to meet the requirements of lubrication and cooling in long-time operation. The precisely grinded screw seals of chrome plated were adopted in the pump to guarantee no leakage between stages during operation. Therefore,the pump can maintain a sufficiently high volumetric efficiency and subsequently a better total efficiency.
Functioning as an core equipment in high-pressure water systems,the ultrahigh-pressure multistage centrifugal pump( UPMCP) has been widely applied in industries such as metallurgy,chemical,petroleum and electric power sectors. However,there is a difficulty in axial thrust balance on the rotor in UPMCPs and the seals between stages are damaged easily after a long period of operation experienced currently. In this paper,Structural characteristics of UPMCPs for phosphorus removal were studied and analyzed,and then a axial thrust self-balanced type SDZ310 UPMCP with double cases was developed. The impellers were symmetrically arranged on the pump rotor to make the axial thrust on the rotor self-balanced to extend pump life-span and strength the operation ability of pump. In consequence,the difficult problem of balancing frequently varied axial thrust,which was caused from constantly variable operation conditions in phosphorus removal services,was solved. A centralized oil supply and return system with check valves was integrated into the pump to meet the requirements of lubrication and cooling in long-time operation. The precisely grinded screw seals of chrome plated were adopted in the pump to guarantee no leakage between stages during operation. Therefore,the pump can maintain a sufficiently high volumetric efficiency and subsequently a better total efficiency.
引文
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[7]戴晓春,赵德清.多级离心泵轴向浮动支撑结构的研究与设计[J].流体机械,2017,45(5):42-45.DAI Xiaochun,ZHAO Deqing.Research and design of the combined supporting structure of floating sliding bearing and no-edge cylindrical roller bearing of multistage centrifugal pump[J].Fluid machinery,2017,45(5):42-45.(in Chinese)
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[9]王伟平.离心泵机械密封失效的原因与对策探索[J].产业与科技论坛,2015,14(7):64-65.WANG Weiping.Causes&countermeasures of mechanical seal failure of centrifugal pump[J].Industry&science and technology forum,2015,14(7):64-65.(in Chinese)
[10]柴春林.离心泵机械密封泄漏现象分析[J].润滑与密封,2009,34(1):104-105.CHAI Chunlin.Leakage analysis of mechanical seal of centrifugal pump[J].Lubrication engineering,2009,34(1):104-105.(in Chinese)
[11]樊铭.离心泵机械密封泄漏原因分析及处理[J].能源研究与管理,2011(4):48-49.FAN Ming.Analysis and treatment of centrifugal pump mechanical seal leakage[J].Energy research and management,2011(4):48-49.(in Chinese)
[12]陈玉宝,黄福川.离心泵填料密封失效原因及改进措施[J].油气储运,2003(5):55-57.CHEN Yubao,HUANG Fuchuan.Failure cause of packing seal of centrifugal pump&improvement measures[J].Oil&gas storage and transportation,2003(5):55-57.(in Chinese)
[13]肖军.谈离心泵的机械密封及其控制[J].液压气动与密封,2010,30(5):38-42.XIAO Jun.On centrifugal pump mechanical seal and its control[J].Hydraulics pneumatics and seals,2010,30(5):38-42.(in Chinese)
[14]HA T W,CHOE B S.Numerical simulation of rotor dynamic coefficients for eccentric annular-type-plain-pump seal using CFD analysis[J].Journal of mechanical science and technology,2012,26(4):1043-1048.
[15]HA T W,LEE Y B,KIM C H.Leakage and rotor dynamic analysis of a high pressure floating ring seal in the turbo pump unit of a liquid rocket engine[J].Tribology international,2002,35(3):153-161.
[16]WANG C,SHI W,ZHANG L.Calculation formula optimization and effect of ring clearance on axial force of multistage pump[J].Mathematical problems in engineering,2013,DOI:10.1155.2013/749375.
[2]关醒凡,张大恩,张光兵,等.对称布置叶轮多级泵轴向力及平衡措施[J].水泵技术,2012(4):1-3.GUAN Xingfan,ZHANG Daen,ZHANG Guangbing,et al.Axial force&balance measure of multistage pump with symmetrical arrangement impeller[J].Pump technology,2012(4):1-3.(in Chinese)
[3]赵万勇,王钊,杨登峰,等.多级泵平衡盘动态平衡的理论研究[J].流体机械,2012,40(9):35-38.ZHAO Wanyong,WANG Zhao,YANG Dengfeng,et al.Theoretical study on dynamic equilibrium of balance disc in multi-stage pump[J].Fluid machinery,2012,40(9):35-38.(in Chinese)
[3]宋怀德,习宁刚,马文瑛,等.自平衡式高压多级输油泵的可靠性研究分析[J].流体机械,2016,44(5):60-62.SONG Huaide,XI Ninggang,MA Wenying,et al.Reliability analysis of the self-balancing type high pressure multistage oil pump[J].Fluid machinery,2016,44(5):60-62.(in Chinese)
[4]周哲波,李明,杨小娇,等.叶轮对称布置式多级泵轴向力平衡研究[J].煤矿机械,2015(9):107-108.ZHOU Zhebo,LI Ming,YANG Xiaojiao,et al.Study on balance axial force of symmetrical arrangement of impeller multistage pump[J].Coal mine machinery,2015(9):107-108.(in Chinese)
[5]朱正写,杨新春,金立新,等.多级泵的故障分析及处理[J].化工设备与管道,2016,43(5):45-47.ZHU Zhengxie,YANG Xinchun,JIN Lixin,et al.Analysis and treatment of faults occurred in multi-stage pumps[J].Process equipment&piping,2016,43(5):45-47.(in Chinese)
[6]迟秋立,吴鑫山,邢磊.多级离心泵平衡盘鼓联合平衡装置设计探讨[J].流体机械,2010,38(5):38-41.CHI Qiuli,WU Xinshan,XING Lei.Study for multistage centrifugal pump equilibrator design[J].Fluid machinery,2010,38(5):38-41.(in Chinese)
[7]戴晓春,赵德清.多级离心泵轴向浮动支撑结构的研究与设计[J].流体机械,2017,45(5):42-45.DAI Xiaochun,ZHAO Deqing.Research and design of the combined supporting structure of floating sliding bearing and no-edge cylindrical roller bearing of multistage centrifugal pump[J].Fluid machinery,2017,45(5):42-45.(in Chinese)
[8]ZHOU Ling,SHI Weidong,LI Wei,et al.Numerical and experimental study of axial force and hydraulic performance in a deep-well centrifugal pump with different impeller rear shroud radius[J].Journal of fluids engineering,2013,135(10):10450.
[9]王伟平.离心泵机械密封失效的原因与对策探索[J].产业与科技论坛,2015,14(7):64-65.WANG Weiping.Causes&countermeasures of mechanical seal failure of centrifugal pump[J].Industry&science and technology forum,2015,14(7):64-65.(in Chinese)
[10]柴春林.离心泵机械密封泄漏现象分析[J].润滑与密封,2009,34(1):104-105.CHAI Chunlin.Leakage analysis of mechanical seal of centrifugal pump[J].Lubrication engineering,2009,34(1):104-105.(in Chinese)
[11]樊铭.离心泵机械密封泄漏原因分析及处理[J].能源研究与管理,2011(4):48-49.FAN Ming.Analysis and treatment of centrifugal pump mechanical seal leakage[J].Energy research and management,2011(4):48-49.(in Chinese)
[12]陈玉宝,黄福川.离心泵填料密封失效原因及改进措施[J].油气储运,2003(5):55-57.CHEN Yubao,HUANG Fuchuan.Failure cause of packing seal of centrifugal pump&improvement measures[J].Oil&gas storage and transportation,2003(5):55-57.(in Chinese)
[13]肖军.谈离心泵的机械密封及其控制[J].液压气动与密封,2010,30(5):38-42.XIAO Jun.On centrifugal pump mechanical seal and its control[J].Hydraulics pneumatics and seals,2010,30(5):38-42.(in Chinese)
[14]HA T W,CHOE B S.Numerical simulation of rotor dynamic coefficients for eccentric annular-type-plain-pump seal using CFD analysis[J].Journal of mechanical science and technology,2012,26(4):1043-1048.
[15]HA T W,LEE Y B,KIM C H.Leakage and rotor dynamic analysis of a high pressure floating ring seal in the turbo pump unit of a liquid rocket engine[J].Tribology international,2002,35(3):153-161.
[16]WANG C,SHI W,ZHANG L.Calculation formula optimization and effect of ring clearance on axial force of multistage pump[J].Mathematical problems in engineering,2013,DOI:10.1155.2013/749375.