叶片泵反转危害的案例浅析

介绍了叶片泵叶轮断裂故障发生的过程，进行了原因分析及结论判定，总结了防范措施。     

凉水塔风机反转各传动部件损坏原因分析及预防措施

对凉水塔风机冬季反转各传动部件的损坏进行了分析，找到了损坏的原因，并采取了可行的预防措施。     

浅谈离心泵机械密封常见故障及控制措施

通过离心泵机械密封的原理分析,介绍了机械密封的常见故障发生原因及处理方法,并阐述了提高机械密封使用效果应采取的合理措施,最后提出了机械密封的检修误区和拆装要点.     

实现离心泵系统最优运行的探讨

泵站的经济运行就是要求以最少的能耗获得最大的经济效益。本文从离心泵变速调节原理入手,探讨了以提高泵站效率,实现泵系统的最优运行为目标的离心泵变速调节的计算方法和效果。     

离心泵调速运行节能效果的试验研究

利用可控硅串级调速系统对14sh-9A型离心泵进行变速运行试验，并对试验结果及节能情况进行分析，说明变速运行的节能效果及变速运行中应注意的问题。     

离心泵和管道汽蚀的危害和防护

分析在离心泵以及管道中汽蚀的产生、危害以及防护措施。     

实现离心泵系统最优运行的探讨

泵站的经济运行就是要求以最少的能耗获得最大的经济效益。本文从离心泵变速调节原理入手,探讨了以提高泵站效率,实现泵系统的最优运行为目标的离心泵变速调节的计算方法和效果。     

谈水处理中离心泵的常见问题防范及发展方向

以河南省重点环保工程中铝洛铜大循环水处理站使用的离心泵为例,讨论其常见问题防范及发展方向。     

离心泵的事故预防与经济运行

本文就如何做好卧式离心泵的事故预防工作,降低运行成本给出建议,对操作工、点检人员、设备检修人员和设备管理人员的工作有所帮助。     

多级离心式压缩机故障停机反转过程模拟与计算

从转动力学角度对多级离心式压缩机故障停机反转过程进行了研究,建立了系统正常停机过程与反转停机过程模型,利用编制的程序进行了计算.结果表明:离心式压缩机故障停机过程中出现反转,是由于高压气体从压缩机出口通过压缩机内部流到进口,产生了反向推力矩.理论分析模型计算结果与实际停机过程记录数据较为吻合,能够有效的模拟停机反转过程.     

Numerical Research on Performance Prediction for Centrifugal Pumps

Performance prediction for centrifugal pumps is now mainly based on numerical calculation and most of the studies merely focus on one model. Therefore, the research results are not representative. To make an improvement of numerical calculation method and performance prediction for centrifugal pumps, performance of six centrifugal pump models at design flow rate and off design flow rates, whose specific speed are different, were simulated by using commercial code FLUENT. The standard k-ε turbulence model and SIMPLEC algorithm were chosen in FLUENT. The simulation was steady and moving reference frame was used to consider the impeller-volute interaction. Also, how to dispose the gap between impeller and volute was presented and the effect of grid number was considered. The characteristic prediction model for centrifugal pumps is established according to the simulation results. The head and efficiency of the six models at different flow rates are predicted and the prediction results are compared with the experiment results in detail. The comparison indicates that the precision of head and efficiency prediction are all less than 5%. The flow analysis indicates that flow change has an important effect on the location and area of low pressure region behind the blade inlet and the direction of velocity at impeller inlet. The study shows that using FLUENT simulation results to predict performance of centrifugal pumps is feasible and accurate. The method can be applied in engineering practice.     

Effects of Blade Number on Characteristics of Centrifugal Pumps

The blade number of impeller is an important design parameter of pumps,which affects the characteristics of pump heavily.At present,the investigation focuses mostly on the performance characteristics of axis flow pumps,the influence of blade number on inner flow filed and characteristics of centrifugal pump has not been understood completely.Therefore,the methods of numerical simulation and experimental verification are used to investigate the effects of blade number on flow field and characteristics of a centrifugal pump.The model pump has a design specific speed of 92.7 and an impeller with 5 blades.The blade number is varied to 4,6,7 with the casing and other geometric parameters keep constant.The inner flow fields and characteristics of the centrifugal pumps with different blade number are simulated and predicted in non-cavitation and cavitation conditions by using commercial code FLUENT.The impellers with different blade number are made by using rapid prototyping,and their characteristics are tested in an open loop.The comparison between prediction values and experimental results indicates that the prediction results are satisfied.The maximum discrepancy of prediction results for head,efficiency and required net positive suction head are 4.83%,3.9% and 0.36 m,respectively.The flow analysis displays that blade number change has an important effect on the area of low pressure region behind the blade inlet and jet-wake structure in impellers.With the increase of blade number,the head of the model pumps increases too,the variable regulation of efficiency and cavitation characteristics are complicated,but there are optimum values of blade number for each one.The research results are helpful for hydraulic design of centrifugal pump.     

离心泵与管路系统优化选型

通过对离心泵及管路组成的系统分析，建立了离心泵数据库和管路数据库及其管理系统，并在此基础上建立了离心泵及管路系统优化设计及优化选型数字模型，确定了求解方法，编制了计算机软件。     

锥面机械密封在离心砂泵中的应用研究

本文分析了锥面机械密封的结构及特点，提出了变载荷系数K是影响密封比压的重要因素和弹簧比压的确定方法。锥面机械密封已应用在离心砂泵上，经钻井公司使用，效果良好，泄漏量小，寿命长，功耗低。     

双吸离心泵技术水平统计分析

在对全国泵行业骨干企业进行行业调查的基础上,收集双吸清水离心泵3000余个规格的性能数据,将效率、汽蚀余量两个性能指标的实测数据、标准数据、样本数据分别进行统计分析。 介绍了对比分析方法：国内外产品的水力性能指标分别与国家标准进行比较分析,找出差别,将这两个差别再进行比较,从而比较出国内外产品技术水平的差异。对比分析结果为：国外产品的效率指标平均技术水平要高于国内的效率指标2．5％;国内的汽蚀余量指标平均技术水平要优于国外产品0．97m。在效率指标方面,优劣的顺序为：国内的样本值最高、国外的样本值次之、国内的实测值最低。对产生国内外产品技术水平差异的原因进行了分析,主要原因有：转速大小不一致、设计制造水平不同、效率与汽蚀余量性能指标的技术水平不平衡等。     

基于Excel的离心泵设计计算方法

详细阐述了利用Excel进行离心泵主要水力参数的计算,以及平衡孔、平衡盘等轴向力平衡计算的方法,利用此方法可以大大减轻设计人员的计算工作量。     

离心式水泵冲击损失的计算与分析

以降低叶轮进口冲击损失为目标,对进口边为径向和轴向两种情况下的叶轮进口条件进行了优化,得到了相应的进口直径计算公式。分析了离心泵叶轮进口冲击损失的形成机理,计算并分析了冲击损失随流量和冲角变化的关系。基于此研究分析了流量和进口冲角对冲击损失的影响,得出了进口冲击损失值在设计和非设计流量下的变化趋势,为泵产品的性能预测提供了理论和技术支持。     

离心泵快速启动过程仿真与优化

离心泵在快速启动过程中影响外特性的因素有阀门开度、管道阻力、动力源特性等.为了分析动力源特性在离心泵快速启动过程中对流量和转速的影响,构建了Simulink和Flowmaster的联合仿真模型来模拟离心泵测试系统.在Flowmaster中构建出离心泵测试台,在Simulink中构建出直流电机闭环PI调速仿真模型作为动力...