流体机械

2011, v.39;No.473(11) 28-31

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三螺杆泵螺杆与衬套最优间隙的理论研究
Theoretical Study on Optimum Clearance between Rotors and Case in Three-screw Pump

单玉霞;王兆伍;郑梅生;居荣华;王立杰;
SHAN Yu-xia,WANG Zhao-wu,ZHENG Mei-sheng,JU Rong-hua,WANG Li-jie(Nanjing Forestry University,Nanjing 210037,China)

摘要(Abstract):

三螺杆泵螺杆与衬套的间隙值是决定泵工作性能的重要因素,为了合理确定螺杆与衬套的间隙,以标准135型三螺杆泵为研究对象,分析了螺杆与衬套间隙内的流体状态,主要存在剪切流和一般库埃特流。根据平行平板缝隙流理论,建立回流介质经过一个完整密封腔所造成的包括泄漏损失和粘性摩擦损失的总功率损失为目标函数,通过求取最小值,得到特定工况下确定三螺杆泵螺杆与衬套最优间隙的理论公式。结果表明,最优间隙主要与工作压力、转速和介质粘度有关,研究结果将对三螺杆泵设计提供重要参考依据。
Clearance between rotors and case of three-screw pump is important to its working performance.In order to reasonably determine the clearance between rotors and case,the 135 type three-screw pump was studied,the flow in the clearance was analyzed,it is found out that there are couette and general couette flow in it.According to the theory of parallel plate gap flow,a objective function was established,which describes the sum of leakage and viscous friction loss in the clearance when backflow passes through a whole seal chamber.Then,a theoretical formula to determine the optimum clearance between rotors and case of three-screw pump at special working case was given by solving the minimum value of objective function.The results shows that optimum clearance between rotors and case has relations with working pressure,speed revolution and viscosity of liquid medium.The results would provide references for design of three-screw pump.

关键词(KeyWords): 三螺杆泵;最优间隙;平行平板间隙流;泄漏损失;粘性摩擦损失
three-screw pump;optimum clearance;paralell plate gap flow;leakage loss;viscous friction loss

Abstract:

Keywords:

基金项目(Foundation): 江苏省高校自然科学研究计划项目(08KJD460011)

作者(Authors): 单玉霞;王兆伍;郑梅生;居荣华;王立杰;
SHAN Yu-xia,WANG Zhao-wu,ZHENG Mei-sheng,JU Rong-hua,WANG Li-jie(Nanjing Forestry University,Nanjing 210037,China)

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