连成集团在大型灌溉排水泵站更新改造关键技术领域的研究进展

正一、应用背景大型灌溉排水泵站担负着农田灌溉提水与排涝任务。我国大型灌溉排水泵站多建于20世纪70-80年代,受河湖水位变幅大、水中泥沙含量高等客观因素以及泵站技术体系不健全等主观因素限制,普遍存在装置效率低、运行稳定性差、灌溉和排水保证率不足的突出问题,亟需更新改造。"大型灌溉排水泵站更新改造关键技术及应用"项目由上海连成(集     

泵站钢闸门腐蚀因素分析与对策

从理论上阐述了泵站钢闸门腐蚀失效的机理。从工作环境中pH值、盐浓度、泥沙冲击和焊缝腐蚀等角度,分析了影响钢闸门腐蚀失效的各种因素,提出了涂层防护、金属热喷涂防护、牺牲阳极阴极保护法、技术管理等防止钢闸门腐蚀失效的技术措施,使钢闸门减少过流部位金属腐蚀,以提高其有效的使用寿命。结合泵站运行实践经验表明,金属热喷涂是钢闸门防腐蚀途径的最佳选择。     

泵站钢闸门腐蚀原因分析与对策

针对泵站钢闸门腐蚀失效的问题,分析了造成钢闸门腐蚀失效的原因,提出了保护措施,延长了钢闸门的使用寿命。     

盐官泵站快速闸门系统的见解和意见

因为实际情况，90年代初主流设计的大型泵站，闸门控制液压系统采用当初的主流的方案，存在了一些弊端和隐患。该见解提出了水泵闸门独立供油方案，有效达到要求。另外，从电气上选用蓄电池输出的直流电操作系统，更排除了泵站的停电隐患。     

水利工程中泵站的安全运行管理分析

在水利工程中，泵站占据着重要地位，能够为城市居民生活和工农业生产提供所需的水资源，能够发挥调水、排水作用，避免雨水汛期出现洪涝灾害，保障人们的生命安全和财产安全，也能切实保障国家水安全。就实际而言，泵站的安全运行会直接影响水利工程建设质量，一旦泵站日常运行缺乏安全性，经常出现故障问题或者其他安全隐患，就会直接降低水利工程的整体效用，难以实现水资源的合理优化配置，大大降低了水资源的利用率，这将会给水旱灾害防治、流域区域协调发展带来不良影响。所以，我们需要深刻认识到水利工程中泵站的重要作用，采取有效的管理措施确保泵站的安全有效运行，全面消除安全隐患，最大限度发挥出泵站的价值所在，促进水利工程持续发展。     

利用GSM短消息业务实现排灌泵站集群监控

针对以往排水管渠系统中泵站使用的电能损耗大、运行效率低等不足，开发了远程实时控制的基于CSM技术的排灌泵站集群监控系统。该系统实现了测控技术和通信技术的完美结合。其最大特点是能通过手机、手提电脑操作远程操作泵站，提高了系统工作性能。本文详细阐述了其结构和设计原理，并简单介绍了GSM技术。     

城市排水泵站优他运行改造实例

排水泵站是耗费电能较高的市政设施.利用原集水池将分建式旧泵站改造为合建式泵站,在增加抽升能力时需要解决集水池有效容积问题;由于场地限制不能安装格栅,水泵选型时需要解决堵塞问题;另外,还要考虑节能、优化运行、自动化控制、下穿式雨水泵站收水系统改造等问题,介绍了邯郸市三座排水泵站的改造实例和实际运行效果.     

城市排水泵站优化运行改造实例

排水泵站是耗费电能较高的市政设施。利用原集水池将分建式旧泵站改造为合建式泵站,在增加抽升能力时需要解决集水池有效容积问题;由于场地限制不能安装格栅,水泵选型时需要解决堵塞问题;另外,还要考虑节能、优化运行、自动化控制、下穿式雨水泵站收水系统改造等问题,介绍了邯郸市三座排水泵站的改造实例和实际运行效果。     

黄石市排水设施在线监测系统建设与实践

介绍了黄石市排水设施在线监测系统实现的具体功能,阐述了污水处理厂、污水泵站、排渍泵站和排水溢流口等排水设施监测系统框架,分析了系统通讯方式的合理性,对系统主要软、硬件进行了技术选型和说明,并总结了排水设施在线监测系统建设实践经验。     

平面钢闸门失效因素分析与对策

阐述了平面钢闸门失效的几种常见形式,并对其失效因素进行了分析。结合某雨水泵站运行实践,在钢闸门设计、安装质量、维护与保养、表面防腐以及拦污栅技术管理等五个方面,提出了有效防止钢闸门早期失效的具体对策与措施,旨在提高泵站设备运行的可靠性。     

液控自动闸阀在给排水泵站中的应用

液控自动闸阀是利用水泵在启动和停机过程中工作压力的变化,通过吸扬水管中的工作介质控制液控自动闸阀的换向控制阀,使闸板按照水泵工作程序自动完成启闭。该阀于１９９４年获得了国家专利,专利号为ＺＬ９４２３７９２９．２。本文介绍了液控自动闸阀的结构,工作原理和性能特点,分析了液控自动闸阀在实际工作中的使用条件。     

二维柱塞泵缸体配油口对称度测量机理研究

为了确定二维柱塞泵缸体配油口对称度的测量方法,基于海克斯康三坐标测量仪分别使用定义法及推荐法对缸体配油口进行测量,并对二维柱塞泵的工作原理和两种方法的测量结果及对称度测量机理进行分析。分析结果表明:定义法的对称度测量方式更符合二维液压泵的实际使用工况。     

Experimental and theoretical modeling of a quarter-circular gate flow

Gates are important hydraulic structures and used for flow measurement, water delivery, and water level regulation in open channels and irrigation networks. In this study, the quarter-circular gate is introduced and investigated. The cross section of this gate consists of a quarter circular arc and the lip angle of the gate equals to zero. Discharge coefficient, variation of downstream flow depth, and velocity distribution at opening section of gate were experimentally measured. Using potential flow theory supported by dimensional analysis, equations for discharge coefficient and velocity distribution at gate opening section of quarter-circular gate were derived and then validated using experimental data. The mean percentage error (MPE) of obtained equation for discharge coefficient of quarter-circular gate was calculated as 2.24%, indicating the high precision of the proposed theory. Based on obtained results, downstream flow depth of quarter-circular gate is uniform. Also, velocity distribution at gate opening section is nearly uniform. Discharge coefficient of quarter-circular gate was averagely obtained 55% larger than that of sluice gate. It was also obtained larger than that of radial gate. Elimination of contraction section at downstream of gate opening, which is the main source for energy loss and therefore discharge capacity reduction, is the main reason for larger discharge coefficient of quarter-circular gate.     

Moldflow在不对称薄壳注塑件浇口优化设计中的应用

以不对称薄壳手机注塑件为研究对象,运用Moldflow软件对模具浇口进行了优化设计.通过对不同浇口数量和位置进行模拟流动分析,从产品的填充时间、熔接痕和气穴等方面对不同的浇口设计方案进行对比,从而获得了最佳的浇口设计,为同类产品模具浇口的设计提供了合理的依据.     

Rotary gate: Submerged flow condition

The rotary gate is a recently proposed gate for application in semicircular elevated irrigation networks. In this study, the hydraulics of rotary gate submerged flow was theoretically and experimentally investigated. Two approaches for estimating the submerged flowrate were considered, namely the stage-discharge based on the superposition rule and the dimensional analysis principles. The results revealed that the gate opening angle and the submergence ratio affect the submerged discharge the most. Based on the compiled experimental data relationships for estimating the discharge in such flow conditions were presented. Statistical analysis indicated that both approaches yielded satisfactory results for discharge estimation. Also, the submerged threshold condition of the rotary gate was investigated and a relationship was proposed whose results concurred with the observed data. In addition, the gate discharge coefficient and its head loss were studied and relationships for determining the discharge coefficient and the relative head loss in submerged flow condition were proposed.     

遥控式液压启闭机的设计与运用

液压启闭机在水利水电工程中的应用越来越广泛。本文介绍了工业用遥控装置在水利水电工程闸门液压启闭机中的设计与运用,重点介绍了湖北省汉川市汉川泵站更新改造工程泵房流道出口工作闸门遥控式液压启闭机的特点,为将来在其它水利水电工程上的推广和使用,提供可借鉴的经验。     

Experimental analysis of combined side weir-gate located on a straight channel

Flow measurement and control in open channel system for lateral flow is important to support the system management. The flow characteristics of combined side weir-gate are complicated due to changes in flow conditions along the side weir-gate section. Experimental investigation of the flow characteristics of both weir and sluice gates is crucial for predicting the flow through a combined side weir-gate structure. Although weir-gate structures are widely used for frontal flow in hydraulic structures, the same is not true for lateral flows. In this study, 650 laboratory tests were conducted to determine the flow characteristics of combined side weir-gate for subcritical flow, and the experimental results were analyzed to determine the effect of these characteristics and weir-gate geometry on discharge capacity. Interaction factor of combined side weir-gate is a function of the upstream Froude number, the ratio of gate opening to upstream flow depth, the ratio of distance between the top of the sluice gate and the weir crest to gate opening, the ratio of weir and gate length to upstream flow depth, and the ratio of weir and gate length to main channel width. Consequently, more discharge is passed through combined side weir-gate compared to side weir and sluice gates. The empirically derived equations for the discharge of combined side weir-gate show good compatibility with the experimental data.     

Effective parameters for calculating discharge coefficient of sluice gates

The present work demonstrates the characteristics of flow from sluice gates under free and submerged flow conditions using Energy and Momentum Equations (EMEs). The experimental data was used from the research works reported by different investigators to calibrate the proposed equations. An equation for estimation energy loss factor of sluice gate at free flow was presented and effect of this parameter on increasing discharge coefficient's accuracy was demonstrated. It was derived a theoretical equation for variations of sluice gate's discharge coefficient with relative opening and relative tailwater depth. Effects of energy loss factor on discharge coefficient and distinguishing limit were investigated. In this research the concepts of submergence limit of the gate and the submergence limit of hydraulic jump will be distinguished. By determining effective pressure on the gate and using EMEs, equations for variations of sluice gate's contraction coefficient with relative opening and relative submergence were presented. The result shows that at free flow condition, a minimum contraction coefficient obtained under a certain value of relative gate opening. At submerged flow condition, contraction coefficient would be either increased or decreased depending on the level of flow submergence. This paper carefully considered stage-discharge relationships for estimation gate discharge under free and submerged flow conditions.     

基于CAE技术的叠层注射模具浇口优化设计

在常规注射模具的注射成型过程中,为了确定最佳的浇口位置和数量,往往需要反复的试模、修模,浪费大量人力和物力。本研究对叠层注射模具中如何运用Moldflow确定最佳浇口位置和数量进行了阐述。运用Moldflow软件对洗衣机控制面板注射成型过程中不同浇口位置及数量进行流动模拟,分析填充时间、预测可能存在的气穴位置、熔接痕的位置以及流体前沿温度。通过对模拟结果的比较分析从而最终确定制品注塑成型过程中最佳的浇口位置和数量。采用此种方法避免了反复试模、修模的过程,提高了一次试模成功率,节约了成本、提高了生产率。     

Flow-induced vibration and flow characteristics prediction for a sliding roller gate by two-dimensional unsteady CFD simulation

Numerical analysis on the flow induced vibration and flow characteristics in the water gate has been carried out by 2-dimensional unsteady CFD simulation when sea water flows into the port in the river. Effect of gate opening on the frequency and the mean velocity and the vortex shedding under the water gate were studied. The streamlines were compared for various gate openings. To get the frequency spectrum, Fourier transform should be performed. Spectral analysis of the excitation force signals permitted identification of the main characteristics of the interaction process. The results show that the sources of disturbed frequency are the vortex shedding from under the water gate. As the gate opening ratio increases, the predicted vibration frequency decreases. The bottom scouring occurs for large gate opening rather than smaller one. The unstable operation conditions can be estimated by using the CFD results and the Strouhal number results for various gate opening gaps.