单体泵泵体的开裂分析与对策

针对单体泵泵体试制生产的开裂现象,采用化学成分分析、硬度测试、夹杂物检查、金相组织和晶粒度检查以及扫描电镜分析、X射线衍射应力分析等方法对泵体开裂原因进行分析。结果表明:失效泵体开裂的主要原因是泵体壁厚不均匀,淬火过程中厚壁部位的马氏体转变时间差造成的组织应力导致泵体沿轴线方向开裂。采取下调淬火温度至830℃和提高淬火液油温至80～85℃的淬火工艺,可以有效避免泵体开裂。     

西德KD815型一段甲铵泵的泵体修复

我厂尿素车间共有一段氨基甲酸铵泵(简称一甲泵)四台,其中三台为上海大隆机器厂生产的3W-2BJ_1型泵,一台为西德产的 KD815型泵。一甲泵泵体在氨基甲酸液的强腐蚀和高交变应力的作用下会开裂。国产一甲泵为四通泵体,通常运行5000～7000小时后,便发生开裂。西德 KD815一甲泵的驱动机为全封闭式电机,液压无级调速,较适用于尿素车间泵     

甲铵泵:直通双层泵体结构设计的探讨

一、前言:当前尿素生产中存在的一个较大的技术课题即尿素甲铵泵泵体开裂。氨基甲酸铵泵(简称甲铵泵)是化肥企业尿素生产中的一项主要设备,目前甲铵泵一般都采用往复式柱塞泵。甲铵泵在尿素生产中的任务就是将温度为90～100℃的氨基甲酸铵溶液由17Kg/cm~2增压在200～220Kg/cm~2后送入尿素合成塔。甲铵泵泵体的工作条件是恶劣的,工作介质氨基甲酸铵溶液是一种强腐蚀溶液,泵体在近200Kg/cm~2压差的不对称循环负荷下工作,在交变应力与介质腐蚀的联合作用     

3W-2BJ_1一段甲铵泵的改造

我国一、二版设计的中型尿素厂使用的一段甲铵泵均为3W-2BJ_1型,柱塞往复63次/分,设计能力12米~3/小时。由于设计存在的严重缺陷,成为影响尿素生产的难题。1979年我厂对泵体、零部件进行改造,並将一段吸收塔框架抬高,使一甲泵运行正常,达到设计能力。一、3W-2BJ_1四通泵体及零部件的缺陷 1.四通泵体容易腐蚀疲劳开裂四通泵体内腔在交变应力作用下,XY面上的A、B、C、D点最大切向拉应力峰值达12公     

飞劲在科隆轮胎展上推出3款轮胎

正由江苏赛尔橡胶股份有限公司申请的专利(公开号CN 107035656A,公开日期2017-08-11)"一种可移动的充气橡胶制品装置",涉及的装置包括把手、支架、泵体、压力表和连接杆,泵体由连接泵、减震防护套、加固盘、泵体保护壳和条形凸起组成。其中,把手焊接于泵体一侧顶部下方,支架焊接于泵体下方,压力表嵌套于泵体上方     

离心泵两种密封环间隙结构的泄漏量比对分析

离心泵泵体、叶轮间密封环间隙中的泄漏,是影响离心泵容积效率的主要因素之一。通过对离心泵常规泵体、叶轮密封环结构的分析,借鉴迷宫式密封的工作原理,提出了一种新型的迷宫式泵体、叶轮密封环组合结构,并经过理论计算与CFD数值模拟验证,结果表明,新型泵体、叶轮密封环组合结构的泄漏量大大减小,从而有效提高了离心泵的容积效率。     

专利信息

申请(专利)号CN200510023317.8专利名称一种高压清洗机柱塞泵公开(公告)日2005.07.27申请(专利权)人胡松海发明(设计)人胡松海专利简介一种高压清洗机柱塞泵,包括泵体、泵盖及安装在所述的泵体一侧的斜盘,斜盘推动的多个柱塞,泵体的外侧与泵盖相连接,泵盖的一端连接一进出水座,     

泵体形状对单作用真空泵性能的影响分析

为了预测泵体形状对单作用双吸式真空泵性能的影响,采用理论推导的方法,对椭圆形泵体和分别以椭圆形的长、短轴为直径的圆形泵体进行了对比研究,并基于计算流体力学方法分析了椭圆形泵体内部液体的速度场、压力场和温度场分布情况。结果表明,与采用椭圆形的长轴长度和短轴长度制造的两个圆形泵体相比,椭圆形泵体在散热性能、吸气性能和排气性能方面都优于圆形泵体。在极限压缩比工况下,椭圆形泵体叶轮外部液体的速度分布较为均匀,泵体内部压力场由叶轮中心向边缘逐渐增大。此外,叶轮边缘的压力分布也是不均匀的,冷却介质的温度从入口到出口过程中逐渐升高,并在出口处易形成旋涡,降低冷却效率。     

挠性叶轮泵的进展

挠性叶轮泵系容积式转子泵,是最通用的一种自吸式泵。它的基本元件是一个由橡胶制成的挠性叶轮,挠性叶轮具有星形状叶片,材料为氯丁橡胶。挠性叶轮安装在具有圆柱形空腔的泵体中,泵体有进出口孔与进口管和出口管相连。在泵体圆柱形空腔中,贴着泵体内壁固紧有一个月牙块(见图1),泵体内壁和月牙块形成一个非圆工作腔,王作时挠性叶轮在泵体中旋转,由于挠性叶片的扩张和弯曲,产生吸液和排液作用。这种泵的主要特点是有优良的自吸性能,再加上结构小巧,通用性强和便于携带,在国外泵浦手册上现已列为主要泵种。     

大型离心泵试车事故的分析与对策

在两起大型离心泵试车事故中,均突然发生泵体偏移,泵体与底座联结螺栓被剪断,造成电机与泵体联轴器柱塞变形,不锈钢波形补偿器被破坏的质量事故.离心泵在设计时通常都在泵体与管道之间加一个橡胶挠性接头,但该两起事故中,使用的是不锈钢波形补偿器,且安装分别在泵进、出口位置,在试车时由于压力迅速上升引发事故发生.经过对事故原因的分...     

提高钻井泵陶瓷缸套使用寿命的研究

高压泥浆泵是油田钻井工作台的＂心脏＂,而缸套是泥浆泵的重要磨损部件。工程陶瓷以其高硬度、高耐磨性,耐腐蚀性、表面性能好等优点,在钻井泵缸套中已得到广泛应用。但目前陶瓷缸套的使用寿命相对较短,如何提高陶瓷缸套的使用寿命,已成为陶瓷缸套研究中亟待解决的问题。本研究通过对钻井泵缸套的分析,提出了长寿命陶瓷缸套的要求,从陶瓷材料的选择,力学性能及其微观结构等方面探讨了提高陶瓷缸套使用寿命的方法,为陶瓷缸套生产企业提供改善产品质量的依据和方法。     

废热锅炉服役后筒体环焊缝处的断裂失效研究

某氮肥公司合成氨系统的一台合成废热锅炉筒体环焊缝周围发生多处开裂。利用JB30B冲击试验机对废锅筒体环焊缝处材料的断裂韧性进行实验分析,同时结合断裂力学的基本理论对服役后废热锅炉筒体环焊缝处的开裂失效进行分析。结果表明：由于废锅焊缝区组织的晶界性能变差,使得材料的冲击韧性显著下降,抵抗裂纹扩展的能力降低,最终在机械应力、热应力及腐蚀环境的作用下,筒体环焊缝处发生多处晶间腐蚀开裂,从而导致筒体失效。     

转筒干燥机裂纹失效分析

就复肥厂常规直接加热转筒干燥机焊缝上的裂纹进行了宏观及微观分析 ,找出裂纹形成的原因为应力腐蚀开裂 ,并提出修补措施     

Interkristalline Spannungsrißkorrosion an Hochtemperatur-Winderhitzern. Werkstoffkundliche,fertigungs- und verfahrenstechnische Maßnahmen zur Minderung und Vermeidung der Schäden

Intercrystalline stress corrosion cracking (SCC) in high temperature hot blast stoves. After a brief survey of known cases of stress corrosion cracking and today's protective or repair measures, the results of lab tests are presented which provide new knowledge about the course of nitrate stress corrosion cracking. The lab tests are dynamic stress corrosion cracking tests allowing direct simulation of SCC-attack on structural steels under operational conditions. It thus becomes possible to specifically intervene in the mechanism of SCC. Modifying the factors material, tensile stress, and medium provides a basis for the construction of hot blast stoves not sensitive to SCC.     

多晶硅精馏尾气处理装置自吸泵电机跳停故障诊断及预防

某厂多晶硅精馏尾气处理装置自吸泵电机发生跳停故障,经过对该装置的自吸泵进行分析,发现其叶轮严重失效。本文结合实际工况对该故障进行诊断,通过诊断发现,汽蚀冲蚀、晶间腐蚀等失效模式造成叶轮金属颗粒脱落,导致叶轮的动不平衡,同时脱落的金属颗粒残留在轴与壳之间,致使叶轮卡死,从而造成电机跳停。此外,应力腐蚀开裂也使叶片刚性下降,间接导致电机输出功率增加。针对故障发生的原因,本文从泵的选择、介质处理、日常维护等方面提出了预防措施。     

Mechanical properties of the rust layer induced by impressed current method in reinforced mortar

This paper describes the mechanical effects of rust layer formed in reinforced mortar through accelerated tests of corrosion. The morphological and physico-chemical properties (composition, structures) of the corrosion system were characterized at different stages by using optical microscope and scanning electron microscope coupled with energy dispersive spectroscopy. The corrosion pattern was mainly characterized by a rust layer confined at the interface between the steel and the mortar. Expansion coefficient of rust products was determined from the rust thickness and the Faraday's law.Furthermore, in order to understand the mechanical effects of corrosion on the damage of mortar, displacement field measurements were obtained by using digital image correlation. An analytical model (hollow cylinder subjected to inner and outer pressures) was used with a set of experimental data to deduce the time of cracking and the order of magnitude of the mechanical properties of the rust layer.     

G702-HZ 固体缓蚀阻垢棒在油井中的应用

在油田开发过程中,特别是油田进入中后开发期油井井筒腐蚀结垢日益严重,管杆腐蚀断裂、漏失,结垢使抽油泵、,严重影响了油井产能的正常发挥.在油井油套环加入缓蚀剂和阻垢剂作为一种抑制或减缓腐蚀结垢的有效手段,目前得到了广泛应用.但液体药剂普遍存在损耗量大、保护周期短、保护范围小、加药工艺复杂等缺点.探索试验了一种井下用固体缓蚀阻垢棒,检泵时直接投加到尾管下连接的花管内,使其成分随采出液缓慢、匀速释放,不伤害地层,有效期长,对减轻油井井筒腐蚀结垢有明显效果.     

X80级管线钢的发展及腐蚀实验研究概况

分析了我国的石油天然气消费利用及油气管道建设现状,对国内外X80管线钢的研制和应用情况进行了介绍,同时介绍了国内X80管线钢的腐蚀研究情况.介绍了不同pH值对X80管线钢土壤腐蚀行为的影响以及腐蚀产物钝化膜对钢表面的腐蚀行为与过程的影响.X80级管线钢的抗硫化物应力腐蚀开裂(SSCC)和氢致开裂(HIC)行为的结果表明...     

Concrete cover cracking with reinforcement corrosion of RC beam during chloride-induced corrosion process

This paper deals with the evolution of the corrosion pattern based on two beams corroded by 14 years (beam B1CL1) and 23 years (beam B2CL1) of conservation in a chloride environment. The experimental results indicate that, at the cracking initiation stage and the first stage of cracking propagation, localized corrosion due to chloride ingress is the predominant corrosion pattern and pitting corrosion is the main factor that influences the cracking process. As corrosion cracking increases, general corrosion develops rapidly and gradually becomes predominant in the second stage of cracking propagation. A comparison between existing models and experimental results illustrates that, although Vidal et al.'s model can better predict the reinforcement corrosion of beam B1CL1 under localized corrosion, it cannot predict the corrosion of beam B2CL1 under general corrosion. Also, Rodriguez's model, derived from the general corrosion due to electrically accelerated corrosion experiments, cannot match natural chloride corrosion irrespective of whether corrosion is localized or general. Thus, for natural general corrosion in the second stage of cracking propagation, a new model based on the parameter of average steel cross-section loss is put forward to predict steel corrosion from corrosion cracking.     

Effects of non-uniform corrosion on the cracking and service life of reinforced concrete structures

The purpose of this study is to explore the effects of non-uniform corrosion on cracking behavior of concrete cover. The effects of non-uniform corrosion distribution, cover-to-rebar diameter ratio, and concrete compressive strength on the cracking pressure of concrete cover were studied. The present study indicates that the pressures to cause cracking of concrete cover under non-uniform corrosion conditions are much smaller than those under uniform corrosion case. The cracking pressure decreases up to about 60% depending upon the types of non-uniform corrosion distributions. It was also shown that cover-to-rebar diameter ratio and concrete compressive strength affect greatly the cracking pressure of concrete cover. Realistic equations on the cracking pressure of concrete cover were derived. The comparisons of analysis results with the test data on the cracking pressure of concrete cover show fairly good agreement. Finally, the effect of non-uniform corrosion on the service life of concrete structures was discussed.