通过改变叶轮口环间隙的大小对不同叶片型式的低比转速离心泵进行试验，证明口环间隙对低比转速离心泵效率的影响与泵叶轮的叶片的型式无关。
The experiments on different types of impeller are done by changing the clearance of wear-ring to prove that the clearance has no influence on the pump efficiency under various types of impeller.
本文为提高离心泵叶轮的设计质量及效率提供了一个新的方法。
CAD method for improving design quality and efficiency of centrifugal pump impeller is provided.
矿山排水离心泵在阻力偏高管网中工作时，其流量偏小，效率低。
The mine drainage centrifugal pump operating in the piping with high resistance have smaller fluorite and lower efficiency .
研究表明，流量、扬程、轴功率和效率切割指数具体数值都与普通清水离心泵不同。
The results show that the values of the flow rate, head, shaft power and efficiency trim exponents differ from existing trim exponents for normal centrifugal water pumps.
解决泵行业一直依据经验统计值确定面积比而不能使低比转速离心泵在设计点效率最高这一问题。
It is resolved that design condition efficiency for low specific speed centrifugal pump is not the highest in terms of experiential statistical area ration value.
离心泵铭牌上标出的性能参数即为最高效率点上的工况参数。
Centrifugal pump nameplate on the performance parameters shall be marked the highest point on the efficiency of the working condition parameters.
叶轮轴面图设计的好坏直接影响离心泵的效率。
The design of impeller meridional shape influences directly efficiency of centrifugal pumps.
适用于对汽蚀和效率有不同要求的离心泵设计。
The software of design and optimum for centrifugal pump are designed with Visual Basic program language.
实例表明：提出的计算方法能够提高低比转速离心泵的效率，充实了低比转速离心泵的设计理论。
A practical example showed that the efficiency of pumps with low specific-speed could be improved by using the calculation method presented, so that the design theory of such pumps was substantiated.
讨论了离心泵的运行转速改变后，由于泵效率和管路效率的变化而给整个果装置效率带来的影响，由此可以判断离心泵改变转速后，泵装置的运行是否合理，并可确定泵装置运行的最佳转速范围。
The influence of the change of centrifugal pump rotating speed on the efficiency of the whole pump-unit which due to the variation of the pump efficiency and pipeline efficiency is studied.
一般地，在高排量和低输出压力的条件下离心泵的工作效率最高。
Centrifugal pumps generally operate most efficiently in high-volume, low-output-pressure conditions.
离心泵特性曲线上的效率最高点称为设计点，泵在该点对应的压头和流量下工作最为经济。
Centrifugal pump characteristic curve on the efficiency of the highest point known as the design point, a pump at the point corresponding to pressure head and flow of work under the most economic.
通过对提高某化工装置反应器进料泵扬程两种方法的分析对比、实验研究，提出短叶片偏置设计法是提高低比转速离心泵扬程和效率的有效方法。
It is shown after analysis that the efficiency of roto-jet pump is higher than theefficiency of multistage pump and express pump when it operates in the region of low dis-charge and high lift.
通过对提高某化工装置反应器进料泵扬程两种方法的分析对比、实验研究，提出短叶片偏置设计法是提高低比转速离心泵扬程和效率的有效方法。
It is shown after analysis that the efficiency of roto-jet pump is higher than theefficiency of multistage pump and express pump when it operates in the region of low dis-charge and high lift.
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