采油螺杆泵定子橡胶失效原因分析及检验

介绍了螺杆泵定子橡胶失效的形式,分析了定子橡胶失效的原因,并进行了相关试验验证,找出了引发定子橡胶失效的主要原因,以根据原因采取相应的措施进行预防,进而更好的保障采油螺杆泵的安全稳定高效运行。     

大庆油田螺杆泵定子橡胶适应性研究

定子橡胶使用性能的优劣直接影响着螺杆泵工作性能和寿命,采用多种配方以适应不同的应用条件,开发了性能更加优良的新型定子材料,使得螺杆泵的使用寿命有了大幅度提高。     

螺杆泵定子橡胶性能检测指标的合理确定

描述了螺杆泵的工作条件和环境,通过对螺杆泵定子橡胶性能检测方法与使用性能的相关性分析,提出了螺杆泵定子橡胶质董控制检测的主要性能指标。     

采油螺杆泵橡胶定子加速疲劳模拟试验装置的研制

为了等效、加速模拟螺杆泵橡胶定子的疲劳情况,探究其疲劳寿命,研制了一台采油螺杆泵橡胶定子加速疲劳模拟试验装置。通过螺杆泵实际工况和力学特性分析,对该装置关键零部件进行结构设计,确定了十六齿梅花状金属转子与橡胶块定子的模拟结构和过盈量调整装置结构。该装置能够实现不同温度、过盈量、转速和介质条件下的螺杆泵橡胶定子疲劳模拟试验,试验加速160倍。     

空心转子等壁厚定子螺杆泵技术现场试验可行性分析

由于常规螺杆泵定子橡胶簿厚不均，摩擦受热温度也不相同，而且橡胶部件对工作的环境、工况性能又极为敏感，所产生的变形也就不一致，如果再改变其工作的性能，增大工作扭矩，这样就更会使泵的工作性能下降，发生早期失效，缩短泵的使用寿命。为了改进常规螺杆泵定子技术的不足，减小定子型线变形对螺杆泵工作性能的影响、提高螺杆泵的工作性能、延长其使用寿命，开发研究了空心转子等壁厚定子螺杆泵，等壁厚定子螺杆泵的特殊结构设计，解决了常规螺杆泵定子技术的不足，提高螺杆泵的工作性能，延长其使用寿命，本文通过对设计结构原理、现场试验效果分析，论述了空心转子等壁厚定子螺杆泵技术可行性。     

单头螺杆泵定子橡胶温度场分析

针对在螺杆泵工作过程中,不能直接、有效测试井下工况的橡胶衬套的温度场分布的情况,本文根据螺杆泵定子橡胶几何物理特性,结合传热学原理,以LB1100型单头螺杆泵为例,采用有限元方法建立了常规单螺杆泵和等壁厚单螺杆泵定子橡胶温度场的计算模型,利用有限元分析法进行了定子橡胶衬套力学场、温度场的耦合数值模拟计算,得出了定子橡胶温度分布规律;研究了不同过盈量和转速条件下定子橡胶温升的规律。所得出的理论与规律可为螺杆泵定子的研制开发提供理论依据。     

采油用螺杆泵定子橡胶及其性能的改进措施研究

螺杆泵技术起源于法国,后在世界范围内得以推广应用。进入上个世纪七十年代以后,该技术在原有开采领域被广泛应用,我国对该技术的应用要晚于世界其他国家,但是经过几十年的发展,目前我国已经具备生产各种螺杆泵的技术条件。当然,我国目前生产的螺杆泵因为定子材料方面存在缺陷,影响了螺杆泵的使用寿命。为了提高原油开采效率,必须要研究影响螺杆泵定子橡胶性能的因素,并采用相应的技术手段进行改进。本文主要围绕此问题展开。     

针对螺杆泵定子丁晴橡胶的PVC改性对其力学性能及耐介质性能的影响

橡塑共混改性是提高橡胶性能的重要方式。本文针对螺杆泵定子丁晴橡胶使用聚氯乙烯对其进行改性,研究了聚氯乙烯的加入量对丁腈橡胶力学性能的影响,确定了聚氯乙烯的最佳添加量。并通过对共混体系的耐水、耐油、耐酸、耐碱性能进行测试,为共混体系的实际应用提供了重要的数据基础。     

螺杆泵定子橡胶力学试验及本构模型研究

对螺杆泵定子橡胶材料分别进行不同温度下常规与油浸介质下的单轴拉伸与平面剪切试验。基于试验数据,运用ABAQUS软件,对常规与油浸定子橡胶不同温度下的单轴拉伸与平面剪切组合的应力-应变状态分别采用M-R,Yeoh,Ogden,A-B和VDW五种本构模型进行拟合对比分析,确定出拟合效果较好的螺杆泵定子橡胶材料本构模型为Ogden模型且50℃下模型参数较优。     

螺杆泵定子橡胶溶胀对容积效率的影响及对策

在螺杆泵应用实践中发现,同样的举升高度条件下,螺杆泵现场应用的容积效率比室内检测的容积效率低。经研究发现,造成这种情况的主要原因是,在油井高温、高压条件下,原油或某些化学物质通常会渗透到螺杆泵定子橡胶内部,使橡胶膨胀,体积增大,使实际储存油液的空腔体积变小,导致容积效率降低。解决以上问题的对策主要是,根据油井供液能力,合理选择泵型,使螺杆泵在合理的压差下工作,减小泵容积效率损失;在保证泵的水力特性达标的前提下,尽可能减少螺杆泵定子注胶时的橡胶用量,也可以达到减小橡胶溶胀量,提高螺杆泵容积效率的目的。首先,选用合适…     

6 kV电动机定子绝缘诊断和剩余寿命预测

介绍了6kv电机定子绝缘老化过程。讨论了绝缘诊断的项目及具体进行的测试。介绍了某公司1台已运行9a的6kV电机诊断测试数据及评定结果。由此说明了高压电机定子绝缘老化诊断和剩余寿命预测的必要性。     

Effects of rotor and stator geometry on dissolution process and power consumption in jet-flow high shear mixers

The jet-flow high shear mixer(JF-HSM)is a new type of intensified equipment with special configurations of the rotor and the stator.The mass transfer property and power consumption were studied in the solid-liquid system for a series of JF-HSMs involving different configuration parameters,such as rotor diameter,rotor blade inclination,rotor blade bending direction,stator diameter,and stator bottom opening diameter.The flow characteristics were examined by computational fluid dynamic simulations.Results indicate that the turbulent power consumption of the JF-HSM is affected by the change in rotor blade inclination and stator bottom opening.With the increase in the shear head size and the change in the rotor into a backward-curved blade,the solid-liquid mass transfer rate can be remarkably increased under the same input power.Dimensionless correlations for the mass transfer coefficient and power consumption were obtained to guide the scale-up design and selection of such a new type of equipment to intensify the overall mixing efficiency.     

PVC-U异型材耐候性评价方法分析

分析了硬质聚氯乙烯(PVCU)异型材耐候性的各种试验评价方法。指出刚果红试验、动态热稳定性试验、烘箱试验、紫外灯照射试验等4种试验方法因破坏因素单一而距异型材的实际老化情况有一定差距;快速紫外线(QUV)老化试验和氙灯老化试验均兼顾了热、紫外线、氧和湿度的环境因素,能较准确地预测异型材的长期耐候性;而暴晒场试验是在完全真实环境下的检测,对异型材的长期耐候性预测结果最为准确。     

有机复合TF790KX稳定剂在PVC-U型材加工中应用

通过刚果红变色试验、静态、动态热稳定试验及流变试验,比较了一种铅盐复合稳定剂、有机锡稳定剂T137和有机复合稳定剂TF-790KX对未增塑聚氯乙烯（PVC-U）型材的静态和动态热稳定性,流变性能以及型材的物理机械性能的影响,结果表明：有机复合稳定剂TF790KX是一种可应用于PVC-U型材加工的性价比理想的不合铅产品。     

涂料的危险特性检验

根据宁波出入境检验检疫局危险品实验室受检过的样品的检验结果，分析了不同检验依据对涂料危险类别以及包装类别划分结果的异同，讨论了检验涂料所要做的试验步骤，总结出涂料的危险特性检验流程。     

Report of the Committee on the Dyeing Properties of Disperse Dyes

Four tests are prescribed for assessing the dyeing properties of disperse dyes on polyester fibres. The tests for migration and build-up properties correspond essentially to those already developed for disperse dyes on other fibres. The critical temperature test classifies dyes in terms of relative rate of initial strike. The diffusion test is a simple means of comparing relative rates of penetration of dye into polyester. As with tests recommended in previous reports, these tests permit individual dyes to be rated on an A-E scale for each property, with the exception of the critical temperature test where an A-D scale is used.     

Poly(fluoroalkoxyphosphazenes)—versatile seal materials

Poly(fluoroalkoxyphosphazene) fluoroelastomers are members of a new family of polymers based on a phosphorous–nitrogen backbone. Physical property evaluation tests have demonstrated that these fluorelastomers possess excellent stress–strain properties, low-temperature flexibility, thermal stability, and resistance to a variety of demanding environments including synthetic lubricants, hydrocarbon fuels, and aqueous caustics. Their service temperature range is about ?60° ?200°C. Poly(fluoroalkoxyphosphazene) fluoroelastomers have shown the capability to function in severe dynamic applications; i.e., lip seals (1? in. I.D.) performed for >1000 hr at 5500 rpm in MIL L-7808G lubricant at 115°C. Also, O-ring seals successfully completed a 1000-hr dynamic qualification test over a temperature range of ?54°–163°C in a rod seal test apparatus. These elastomers can be used for seals, O-rings, gaskets, diaphragms, hose, and protective coatings.     

Checking linearity of non-parametric component in partially linear models with an application in systemic inflammatory response syndrome study

Two tests are proposed for checking the linearity of nonparametric function in partially linear models. The first one is based on a Crámer-von Mises statistic. This test can detect the local alternative converging to the null at the parametric rate 1/square root n. A bootstrap resample technique is provided to calculate the critical values. The second one is constructed in a penalized spline framework along with linear mixed-effects (LME) modeling. This is an extension likelihood ratio test for testing zero variance of random effects in LME models. Simulation experiments are conducted to explore the numerical performance of two tests. It is observed that two tests have good level properties, and the first test has a substantially superior power property over the second test in a variety of cases. A real data set is analysed with the proposed tests.     

玄武岩纤维增强尼龙66复合材料的制备与性能研究

采用熔融挤出法制备了尼龙66/玄武岩纤维复合材料,通过力学性能测试、扫描电子显微镜观察及固体流变仪分析等方法研究了偶联荆种类及含量、玄武岩纤维含量对复合材料力学性能、加工性能和动态力学性能的影响.结果表明,偶联剂KH550对改善复合材料的力学性能效果最佳,且随偶联剂KH550含量的增加,复合材料的力学性能先增大后降低;在实验范围内,随着玄武岩纤维含量的增加,复合材料的力学性能显著提高,熔体流动速率降低.     

Interfacial mechanical behavior of 3D printed ABS

We describe an experimental approach for characterizing the local mechanical behavior of acrylonitrile butadiene styrene (ABS) structures processed through fused deposition modeling. ABS test specimens processed in various build orientations were subject to multiscale mechanical tests as well as local morphology and chemical analyses. Instrumented indentation, local dynamic mechanical analysis, and atomic force microscopy tests were used to explore the mechanical behavior and morphology of build surfaces and weld interfaces. An interfacial stiffening effect was found for the majority of the specimens tested, with up to a 40% increase in the indentation elastic modulus measured with respect to the build surfaces. Raman spectroscopy mapping of the interfacial areas revealed ～30% less butadiene/styrene and butadiene/acrylonitrile ratios with respect to analysis of the build surfaces. The results provide insight into the multiscale behavior of additive manufactured structures and offer the potential to guide processing–structure–property understanding of these materials. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43671.