离心泵新型轴向力平衡装置动态轴向力计算及设计方法  

Calculation and design method of dynamic axial thrust of new-type axial thrust balancing device in centrifugal pump

作　　者：刘在伦[1,2] 杨建霞 吴新瑞 邵安灿 LIU Zai-lun;YANG Jian-xia;WU Xin-rui;SHAO An-can(College of Energy and Power Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China;Wenzhou Engineering Institute of Pump and Valve,Lanzhou Univ.of Tech.,Wenzhou 325105,China;PRE(Fujian)Pump Industry Company,Songxi 353500,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]兰州理工大学温州泵阀工程研究院,浙江温州325105 [3]普仑斯(福建)泵业有限公司,福建松溪353500

出　　处：《兰州理工大学学报》2018年第2期54-58,共5页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51269010);浙江省自然科学基金(LY12E09002)

摘　　要：采用动静环内半径不变加大其外半径的方法,对轴向间隙为0.1~1.0mm时其内的液体压力分布、泄漏量、动环上轴向力进行了数值计算及分析.结果表明:轴向间隙液体压力沿半径方向逐渐增大,其关系曲线是斜直线,但动静环外半径与内半径比值和轴向间隙大小对其斜率有明显影响;在相同的动静环的外半径与内半径的比值时,隙径比增大,泄漏量系数具有先急剧增大然后趋于平坦的变化规律,而轴向力系数具有先急剧减少然后趋于平坦的变化规律.从控制轴向力减少液体泄漏量的角度,提出了过渡区隙径比可作为轴向间隙设计的理论依据.对平衡腔内不安装平衡装置时平衡腔液体压力进行了测试,对比分析了平衡装置减少轴向力的效果.In the case of impeller axial clearance being from 0.1 mm to 1.0 mm,the liquid pressure distribution in it,leakage,and axial thrust on the ring are calculated and analyzed by means of increasing the outer radius of both the moving and still rings and keeping that of inner radius constant.The result show that the liquid pressure in axial clearance will radially increase gradually and its dependence curve on radius will be an oblique straight line;both the ratio of outer radius to inner radius of moving and still ring and the size of axial clearance will have an obvious effect on its slope.When that ratio is constant the leakage coefficient will rapidly increase with the increase of the gap-to-diameter ratio at first and then tend to be flat while the axial thurst coefficient will sharply decrease at first and then tend to be flat.In terms of reduction of liquid leakage with axial thrust control,it is proposed that the gap-to-diameter ratio of the transition zone can be taken as a theoretical basis of design of axial clearance of centrifugal pump.The liquid pressure in balance cavity without balancing device is tested,and the effect of the balancing device for reducing axial thrust is analyzed comparatively.

关 键 词：离心泵 轴向力 平衡装置 泄漏量系数 轴向力系数 

分 类 号：TH311[机械工程—机械制造及自动化]