影响水泵变频调速节能效果的主要因素探讨

变频调速是实现水泵节能的重要手段之一。但在应用中如果对其影响因素缺乏综合考虑，不通过精确的计算，不认真分析工艺条件而盲目采用变频调速，往往是投入不少，却难以获得预期的效益，也给变频调速的推广应用带来了负面的影响。本针对影响其调速范围和节能效果的一些因素，主要是调速泵自身效率、配套电机效率、并列运行的其它水泵的协同效率、不同管路特性曲线对其影响以及2种变频供水方式的对比，通过分析，明确了变频调速应用的一些特点和注意事项。     

空调冷水泵变频调速特性分析

本文对空调系统冷水循环泵采用变频调速进行分析,得出水泵变频调速节能效果显著,多台水泵并联工作部分水泵变频时,变频水泵的转速有最低转速限制。全部变频时水泵可以根据所要求的流量变转速运行。在水泵工作点小于单台水泵额定工作点时,可以单台水泵运行,从而克服利用阀门来进行节流的缺点。同时分析水泵变频调速对空调系统平衡和冷水机组运行的影响。     

水泵变频调速节能改造的能效分析

针对合同制能源管理对供水系统改造产生的积极节能效果,以及改造方式影响水泵调速范围和节能效果的一些原因进行了分析,明确了供水系统变频调速改造应用的一些特点和注意事项。     

水泵应用中变频调速方案的选择

讨论了阀门和变频调速两种水泵流量调节方法,指出变频调速在水泵节能方面的优势。对变频投资回收年限公式进行了推导,并由其绘制了回收年限曲线,以此对变频调速方案的经济性给出直观的评价。由回收年限曲线可以看出,变频调速调节流量方式的经济性由流量调节比决定,调节比越大,经济效益越佳,反之则越差。     

空调冷水泵变频调速浅析

通过分析空调冷水泵变频调速的工作原理、控制方法以及工作特性，并以工程实例加以说明，得出水泵变频调速具有非常显著的节能效果。     

变频器及交流调速在连铸机上的应用

利用变频器对交流感应鼠笼型电动机进行调速,是近年来国内逐渐采用的新技术,而多数推荐应用在风机和水泵类为对象的恒转矩传动工况,使风机和水泵在无需满载运行时,经调速降低负荷达到节电的目的,本文介绍的交流电动机经变频调速作为电力拖动,用于负载不恒定、要求调速范围大、响应快的连铸机上做了些赏试,并取得了一些经验,如何完善交流电动机变频调速,有条件地取代直流机调速是今后的方向。     

变频调速在铝行业的应用

变频调速具有故障率低、调速精度高、保护功能多、无冲击起动、软停机和节能效果显著等优点,本文通过介绍变频调速在某公司风机、回转窑窑拖动、多功能天车和水泵上的成功应用,说明了变频调速在铝冶炼行业具有广泛应用前景.     

水泵控制系统中变频调速技术的应用

通过对水泵调速运行的节能原理、系统设计及运行分析。总结出水泵采用变频调速控制,节能效果显著,具有明显的经济效益和社会效益。     

变频调速技术在供水系统中的应用

简要介绍了供水泵组使用变频调速装置的基本条件、变频装置容量及台数的确定.提出了使用变频调速装置需注意的问题.     

变频调速技术在济钢焦化厂高压氨水泵上的应用

济钢焦化厂高压氨水泵变频调速系统采用变频器和PLC相结合的方式 ,具有调速精度高、节能等多种功能 ,保证氨水泵正常工作。全年可增加经济效益 77.3万元。     

循环氨水泵节能改造

介绍了工厂生产过程中所用泵的节能改造方式,并对切削叶轮节能改造、应用高效水泵或电机、三元流叶轮改造、电机变频调速改造、永磁调速集中改造技术的投资、运行稳定性、维护费用、节能成本等参数进行了对比。中煤旭阳循环氨水泵对泵叶轮进行改造后,节电效果明显。     

高压水除鳞主泵电机调速系统采用变频器的节能效果

变频调速技术已在各行业得到日益广泛的应用，尤其在泵类系统的控制中显示出很大的经济效益。结合天津钢铁有限公司双棒材主轧线高压水除鳞主泵电动机变频调速系统的应用情况，浅述了变频器调速系统的节能效果。     

A flexible pressure pump for cardiovascular studies

Pressure pumps are useful in cardiovascular studies and in the evaluation of many circulatory devices. Currently available pumps are, however, far from perfect in their methods of syncrhonization, flexibility, and frequency response. To overcome these disadvantages, this study reports the design of a new pressure pump based on a linear motor. The pump can accurately synchronize with an animal's heart beats by using a phase-lock loop (PLL) technique. It has great flexibility and the ability to generate both arbitrary pressure waves and pure sinusoidal waves. The pressure pump has a frequency response of up to 50 Hz which is suitable for cardiovascular studies on rats, rabbits, cats and dogs.     

变频调速技术在电机系统的节能应用分析

本文介绍了电机节能原理，根据选矿厂浮选鼓风机的变频节能改造实例，说明了风机、泵类设备变频改造后节能效果明显。应用变频器后既节约了电能，提高了设备效率，又满足了生产工艺要求，并且有效保护电机，降低企业维修成本，直接和间接经济效益十分明显。     

Continued development of the Nimbus/University of Pittsburgh (UOP) axial flow left ventricular assist system

Nimbus and the University of Pittsburgh (UOP) have continued the development of a totally implanted axial flow blood pump under the National Institutes of Health (NIH) Innovative Ventricular Assist System (IVAS) program. This 62 cc device has an overall length of 84 mm and an outer diameter of 34.5 mm. The inner diameter of the blood pump is 12 mm. It is being designed to be a totally implanted permanent device. A key achievement during the past year was the completion of the Model 2 pump design. Ten of these pumps have been fabricated and are being used to conduct in vitro and in vivo experiments to evaluate the performance of different materials and hydraulic components. Efforts for optimizing the closed loop speed control have continued using mathematical modeling, computer simulations, and in vitro and in vivo testing. New hydraulic blade designs have been tested using computational fluid dynamics (CFD) and flow visualization. A second generation motor was designed with improved efficiency. To support the new motor, a new motor controller fabricated as a surface mount PC board has been completed. The program is now operating under a formal QA system.     

Efficiency of Jet Pumps

A theoretical analysis and an experimental study on the efficiency of water jet pumps, where water is used for both the primary and secondary flows, are presented in this paper. The theoretical efficiency equations for such jet pumps were first derived based on one-dimensional formulation, and the theoretical maximum ideal efficiency of 100% was obtained. An experimental rig was designed and constructed to conduct the experimental study in which a commercial water jet pump was used. The effects of different area ratios of nozzle to mixing throat as well as different nozzle cross sections, which include square and triangular nozzles, on the jet pump performance were then investigated. The best nozzle cross section for the jet pump was found to be circular, and for high efficiency, the area ratio was found to be around 0.30.     

Integrated Model for Optimizing Strategic Overhaul Planning of Distributed Pump Stations

An important part of the lifecycle costs for pump stations are the support costs associated with energy and preventive maintenance of the pumps. Both cost terms are interrelated because a trade-off exists between maintaining pumps frequently (with increased pump efficiency, reduced energy costs and increasing maintenance costs, and pump unavailability) and extending the intervals between the overhauls (increased loss of efficiency, increased energy costs, and decreased maintenance costs). The planner needs to forecast pump overhaul demands to determine budget levels because economic resources are limited. This process is assisted by using mathematical programming methods to prioritize funding for equipment requiring renewal in consideration of limited resources in a strategic time horizon (several years). This work proposes an efficient model to define an overhaul maintenance program for a pump network with a large number of pumps (a few hundred in the case study). The model minimizes the discounted total (energy+overhaul) cost by selecting and scheduling pumps for overhaul subject to budget constraints. The formulation uses 0–1 integer programming.     

High efficiency magnetic bearing for a rotary blood pump

Mohawk Innovative Technology, Inc. (MiTi; Albany, NY) and the Cleveland Clinic Foundation (Cleveland, OH) have been engaged in a joint project to develop a new, high efficiency magnetic bearing for use in a rotary blood pump. Such a bearing would have some advantages with respect to permitting large, low shear clearances and avoiding crevice-like pivot interfaces and surface wear related issues. While magnetically suspended blood pumps have been demonstrated, other prototypes reported in the literature consume 5-15 W of power to energize the bearing. The MiTi bearing has been prototyped and tested. The design is a hybrid configuration, radially passive and axially active. The rotor-and-bearing system has been run in air and in blood analog solution, in all orientations. Measurements show a bearing power consumption below 0.5 W. Vibration peaked at 0.2 g in blood analog solution; frequency analysis indicated that this was primarily related to motor design features. Measured displacements from the equilibrium position were less than 0.005 cm. Based on this highly successful bearing prototype, an integrated pump/bearing system is now being developed.     

煤码头压舱水提升泵房控制系统设计

建立了压舱水提升泵房控制系统与东辅建区泵房控制系统的控制网通讯和软件程序的编制,实现提升泵房4台潜水泵,6个电动阀,2台清水搅拌机的远程监视和控制,并在上位机画面中反应出5个浮球液位计动作及压舱水池水位的变化情况,并提供实时的报警信息,提高了生产作业的自动化水平,极大的提升了压舱水回收效率,方便了设备的使用。通过运煤船压载水舱船泵系统的改造,解决了运煤船压舱水只能排海,不能上岸的问题。     

交流电机变频调速的应用

交流变频调束不但具有直流电机优良的调速特性，内时具备交流电机简单而坚固的结构，因而逐渐被广泛应用。介绍了鞍钢化工总厂硬质沥青加料泵皮带调速改为交流变频调束的实际应用过程。详细说明了调束原理及所带来的经济效益。