Experimental Verification and Research for the Distortion in the Integrated Frequency Responses of the High-Pressure Sealed Cabin and Magnetic Field Sensor

Although magnetotelluric sounding method applied to the land is advanced, there are many difficulties when it is applied to marine environment, one of which is how to lay magnetic field sensors down to the seafloor to complete measurements. To protect the magnetic field sensors from intense erosion and high pressure, suitable high-pressure sealed cabins must be designed to load them. For the consideration of magnetic measurement and marine operation, the sealed pressure cabin should be nonmagnetic and transportable. Among all optional materials, LC4 super.hard aluminum alloy has the highest performance of price/quality ratio to make the sealed pressure cabin. However, it does not mean that the high-pressure sealed cabin made using LC4 will be perfect in performance. In fact, because of its weak magnetism, the pressure cabin made using LC4 has distorting effect on frequency responses of the magnetic field sensors sealed in it. This distorting effect does not affect the use of the magnetic field sensor, but if we want to eliminate its effect, we should study it by experimental measurements. In our experiment tests, frequency sweep magnetic field as excitation signal was used, and then responses of the magnetic field sensor before and after being loaded into the high-pressure sealed cabin were measured. Finally, normalized abnormal curves for the frequency responses were obtained, through which we could show how the high-pressure sealed cabin produces effects on the responses of the magnetic field sensor. Experimental results suggest that the response distortion induced by the sealed pressure cabin appears on mid- and high-frequency areas. Using experimental results as standardization data, the frequency responses collected from seafloor magnetotelluric measurements can be corrected to restore real information about the seafloor field source.

Gas Film Disturbance Characteristics Analysis of High-Speed and High-Pressure Dry Gas Seal

The dry gas seal（DGS） has been widely used in high parameters centrifugal compressor, but the intense vibrations of shafting, especially in high-speed condition, usually result in DGS＇s failure. So the DGS＇s ability of resisting outside interference has become a determining factor of the further development of centrifugal compressor. However, the systematic researches of which about gas film disturbance characteristics of high parameters DGS are very little. In order to study gas film disturbance characteristics of high-speed and high-pressure spiral groove dry gas seal（S-DGS） with a flexibly mounted stator, rotor axial runout and misalignment are taken into consideration, and the finite difference method and analytical method are used to analyze the influence of gas film thickness disturbance on sealing performance parameters, what＇s more, the effects of many key factors on gas film thickness disturbance are systematically investigated. The results show that, when sealed pressure is 10.1MPa and seal face average linear velocity is 107.3 m/s, gas film thickness disturbance has a significant effect on leakage rate, but has relatively litter effect on open force; Excessively large excitation amplitude or excessively high excitation frequency can lead to severe gas film thickness disturbance; And it is beneficial to assure a smaller gas film thickness disturbance when the stator material density is between 3.1 g/cm3 to 8.4 g/cm3; Ensuring sealing performance while minimizing support axial stiffness and support axial damping can help to improve dynamic tracking property of dry gas seal. The proposed research provides the instruction to optimize dynamic tracking property of the DGS.

Development and Application of a Surface High-pressure Injection Device Using a Submersible Electric Pump

Injection recovery is an important measure for increasing the oil recovery rate of an oil field. One way is that centrifugal pumps or plunger pumps are used in an injection station to responsible for injection over a large area under the same pressure. This method is ineffective for low-permeability layers. For the oilfields in dispersed distribution in the marginal areas of Daqing, the low water-absorbing section needs an injection with a high delivery pressure and a low discharge capacity; another way is to install the submersible electric pump upside down, but because the submersible electric pump and the motor are underground, it is difficult for installation and maintenance. Introduced in this paper is the development and application of a surface high-pressure injection device with a submersible electric pump. Bysuccessful resolving some problems, such as the axial force of the submersible electric pump, sealing, level regulation of the pump, coaxiality and vibration, the device has the good points of running smoothly, moving easily, installation and maintains quickly and long period of running. This device can effectively solve the injection of the low water-absorbing section and of oilfields in dispersed locations. The recovery rate of oilfields is also enhanced.

Analysis of the sealing performance of combined sealing structure under deep-sea high pressure environment

For the requirement of safe and stable operation,the combined sealing structure was used for reciprocating motion in the deep sea high-pressure environment,and the effects of different seawater depths and shaft movement speed on the sealing performance of the combined sealing structure were studied.The change rule of the sealing performance of the combined sealing structure of reciprocating motion under different working conditions is proved.The study shows that in the combined sealing structure of reciprocating movement,the Von Mises stress and the contact stress of the O-ring varies with the direction of the shaft movement.The Von Mises stress and contact stress of the O-ring,the Von Mises stress and the contact stress on each sealing lip of the slip ring gradually increase with the increasing of seawater depths.At the same time,the Von Mises stress of the O-ring which in the process of the shaft upward movement is greater than the shaft downward movement,making the shaft upward movement more likely to cause the O-ring relaxation and fatigue.The shaft movement speed has no significant influence on the Von Mises stress and contact stress of the O-ring.The research results provide theoretical guidance and technical support for the selection and optimization of the geometrical parameters of the combined sealing structure in the deep-sea high-pressure environment.

流量控制阀K形金属密封圈结构参数优化

流量控制阀K形金属密封圈结构参数较多,且不同结构参数对密封性能影响程度存在较大差异。以密封面接触压力、密封面有效接触长度及最大Mises应力为约束条件,采用正交试验设计研究影响K形金属密封圈密封性能结构参数之间的主次关系,确定了唇部长度、悬臂内张角与悬臂厚度3个因素作为响应曲面法的设计变量;通过正交试验和回归分析得到接触压力、最大等效应力及有效接触长度与设计参数关系的二次回归方程,并基于响应面法对密封结构进行优化分析。优化后K形金属密封圈的接触压力增加了8.09%,有效接触长度增加了14.73%,最大等效应力减少了13.44%,表明优化后K形金属密封圈密封面接触压力分布更加均匀,有效提高了金属密封圈的密封性能。

基于生产过程的多规格不锈钢管自动封箱装置设计

针对6种不同规格的不锈钢管和企业对产品的包装需求,为实现3~6箱/min的自动包装效率,设计了一种自动封箱装置,该装置由夹箱机构、纸箱拍齐装置、折箱装置、顶升机构和机架5部分组成,通过分析每个机构的结构特点和工作原理,阐述了夹箱机构、纸箱拍齐装置、折箱装置的运动过程,重点分析了折箱机构中针对不同规格的不锈钢管如何设计其短边折箱机构及其主要技术参数的计算方法。实践证明:该封箱装置结构设计合理,整体运行稳定可靠,产品包装速度达到生产要求,减少了单条生产线所需要工人的数量,改变了传统的人工包装方式,提高了生产效率,降低了生产成本,具有较好的推广价值。

船舱隔壁螺旋槽旋转密封装置密封性能优化

为研究螺旋槽旋转密封装置用于船舱隔壁密封的密封性能,同时获取螺旋槽结构的最优取值范围,对螺旋槽各参数对泄漏量影响规律进行理论分析;选取泄漏量的显著性影响因素,采用Box-Behnken优化方法设计密封装置泄漏量试验,得到多型样机泄漏量测试结果;建立泄漏量和各影响因素间的数学模型,获得不同影响因素对泄漏量的二阶交互作用响应面,分析不同影响因素间交互影响规律。结果表明:螺旋槽密封装置泄漏量随槽数、螺旋角和槽深比的增大均先增大后减小,随槽台比和槽坝比的增大则逐渐增大;建立的数学模型计算结果和试验数据相关性较强,表明该模型可用于准确预测船舱隔壁螺旋槽旋转密封装置泄漏量。

Seal contact performance analysis of soft seals on high-pressure hydrogen charge valves

The charge valve is an important element in the charging port of a high-pressure hydrogen storage cylinder(HP-HSC).It is normally closed after the HP-HSC is filled with hydrogen.If the seal of the charge valve is damaged,it will seriously affect the stable operation of the hydrogen supply system and may even cause safety problems.Therefore,the seal performance of the charge valve is important.In this paper,finite element analysis(FEA)is carried out to analyze the seal contact performance of hydrogenated nitrile rubber(HNBR)gaskets in the seal pair of a charge valve.The effects of different pre-compressions,seal widths,and hydrogen pressures on the seal contact performance of the charge valve are analyzed.The contact pressure on the seal surface increases with the increase of pre-compression.With a pre-compression of 2.5 mm,the maximum contact pressure without and with hydrogen pressure are 68.51 and 107.38 MPa,respectively.A contact gap appears in the inner ring of the seal surface with pre-compression below 0.15 mm.The contact gap occurs between the entire seal surface with a seal width of1 mm.The contact pressure on the seal surface and the width of the separation area between the seal surfaces increase with the increase of the seal width.The contact gap between the seal surfaces is zero with a width of 2.5 mm.The width of the separation area between the seal surfaces decreases with the decrease of the hydrogen pressure.The width of the separation area is reduced from 0.5 mm at 35 MPa to 0.17 mm at 15 MPa.This work can be useful for improvement of the seal performance and of the design of the charge valve used in the HP-HSC.

FK465型封箱机条缺包在线检测装置的设计与应用

封箱机作为产品包装的重要设备之一,其性能的优劣直接影响到整个包装生产线的运行效果。该文设计一种封箱机条缺包在线检测装置,并对其性能进行验证。通过对现有检测技术的研究分析,提出基于多点位传感器融合的检测方案。详细阐述检测装置的硬件组成、程序设计以及工作流程。实验结果表明,该装置能够准确、快速地检测出封箱机中的条缺包问题,显著提高生产质量和效率。

一种液晶玻盒封口机构的设计与研究

针对一种液晶玻盒手动封口制程中易造成玻盒位置错位、玻盒液晶二次污染、点胶精准率低、老化时间长和老化良率低的问题,设计了一种全自动液晶玻盒封口机构。介绍了当前人工封口时存在的问题,根据人工封口操作时的工艺制程,使其工艺制程自动化,并且对部分现有制程工艺进行改造升级。结果表明,该自动化液晶玻盒封口机构,不仅使得制程中的产品不良率降低,而且使得制程段人员数量大大减少,提高产品质量的同时整体生产成本也大大降低。

变速箱箱体试漏装置的分析与设计

高速插秧机变速系统中变速箱箱体的试漏是正常生产过程中一个必不可少的关键环节。变速箱箱体的质量是保证变速系统正常工作的前提。根据实际情况,通过对比分析几种试漏方法,最终确定变速箱的试漏方案及试漏设备,从而来检测判定箱体的密封性能,能够提前发现问题,避免对泄露工件进行下一步的装配,造成不必要的损失。

盾构隧道快速应急处置的装配式钢板箱方案研究

随着城市轨道交通建设的快速发展,盾构隧道建设的安全问题受到广泛关注,尤其是涌水事故的频繁发生,导致财产和生命安全损失。为了应对复杂的地质水文条件和周边环境,提出了一种基于平战结合的暗挖隧道装配式安防关键技术。通过现场安装装配式钢构件,形成封闭的回灌水土空间,旨在快速封堵暗挖隧道涌水、涌砂和盾构隧道进洞接收。以南京地铁11号线行知路站接收井为研究对象,进行装配式钢板箱结构设计,并通过理论计算和数值模拟等综合研究手段,验证了装配式钢板箱在水中进洞及抢险工况下应用的可行性和安全性。

TDS-1000A型顶驱的现场预防性维修实践与探讨

顶驱作为海洋石油钻井平台的关键钻井装备之一,已成为石油钻井行业的标准产品。顶驱可从井架上部空间直接旋转钻杆,沿专用导轨向下送进,完成钻杆旋转钻进、循环钻井液、接立柱、上卸扣和倒划眼等多种钻井操作,具有安全生产、提高作业效率、有效防止钻井事故等优点。在日常使用过程中,需要根据其投入使用的运行时间进行定期的预防性维护。由于钻井平台生产节奏紧凑,顶驱大修有时无法在车间进行,因此现场大修往往会成为其第二选择。为完善改进现场维修方法,提高维修质量,节约维修工期,根据工作实践,对TDS-1000A型顶驱现场预防性维修的步骤、方法及注意事项进行了探讨。

某型市域车齿轮箱接地侧迷宫密封结构优化

针对某型市域车齿轮箱润滑油发黑问题,文章结合油样检测、齿轮箱拆解检查,以及接地侧流场仿真计算等进行原因分析,并通过台架故障复现试验进行确认。采取减小迷宫间隙、优化碳粉排放结构等措施对迷宫密封结构进行优化,并进行了仿真分析、台架试验和线路试验对比,结果显示优化后的迷宫密封结构可有效抑制碳粉进入齿轮箱内部。

二棒粗轧机组立式轧机固定端轴承箱密封机构的改进

本文通过对二棒粗轧机组轧机立式机架固定端轴承箱密封机构进行分析、研究,对轴承箱密封机构部分备件进行了完善改进,到达解决轴承箱频繁烧损的难题,实现二棒生产线的高效生产的目标。

一种骨架油封拆卸工具的研制

骨架油封外圈与安装座内孔为过盈配合,在拆卸时较为困难。传统的拆卸方法是采用破坏性拆除,拆卸后骨架油封丧失了原有的密封效果,必须要更换新的骨架油封,此方法不适用于频繁多次拆卸的场合。文中提出了一种全新的骨架油封拆卸方法,并对理论拆卸效果进行了计算验证。

打包机控污式推料箱的研制

针对目前短纤维生产常用打包机中气缸式推料箱易产生污棉的现象,提出了一种改进型气缸式推料箱,通过对推料箱导向结构及其相应推棉板支撑机构、推棉清理机构、推棉密封组件部分进行的结构优化,实现了推料板的精确运动导向,可避免导向结构在运动过程中出现挤棉、卡滞产生污棉的现象。实际生产效果表明改进后的推料箱能有效提高打包机的工作效率和产品质量。

伶仃洋大桥东索塔钢吊箱设计与施工

深中通道伶仃洋大桥为主跨1666 m的3跨钢箱梁悬索桥,主墩承台直径36 m,高度8 m,采用双壁钢吊箱作为承台临时围堰和永久防撞套箱,钢吊箱内径36.2 m,高度16 m,重量为1783 t,施工过程体系转换频繁,受力复杂。建立施工全过程有限元模型,针对性地分析吊装浮运、整体下放、封底浇筑、承台浇筑过程受力,并将有限元计算结果与现场实际监控结果进行了对比,两者较接近;同时采用MSC.Dytran计算软件模拟了10万t船舶从正面和侧面撞击时的钢吊箱防撞效果,得到正面和侧面撞击时最大撞击力分别减小5.6%和7.4%,钢吊箱结构设计合理,总体计算方式和施工方法合理可行。

横向骑跨既有地道曲线宽幅梁拱组合体系桥梁设计与分析

文章以广东省深圳市前海合作区临海桂湾河桥为背景,对异形梁拱组合体系桥梁的设计特点与施工方法进行介绍。桂湾河桥桥位处地形复杂,桩基布置需避开地下通道等构筑物,设计方案最终确定为86.84 m+124.65 m下承式梁拱组合体系桥,并采用骑跨式转换梁跨越地下通道,主梁、拱肋及转换梁构成整体,共同参与结构受力。桥梁平面位于曲线段;主梁采用封闭的正交异形钢箱梁,桥宽56.2 m~57.8 m,桥面宽度较大,按使用功能横向分为四幅桥设计,结构受力复杂;拱肋由大拱和小拱组成,拱肋之间无风撑连接;吊索采用高强钢丝高钒密封索,结构紧凑,性能稳定,在国内首次应用到大跨径桥梁中。采用有限元分析方法,验证了设计的合理性与施工方法的可行性,可为类似桥梁设计与施工提供借鉴。

准噶尔盆地腹部高压和异常高压对油气生成和聚集的影响

高压和异常高压是准噶尔盆地腹部勘探及钻采试油面临的重要问题。马桥凸起盆参２井、盆４并均发现深层异常高压，其封闭层顶部埋深４４８５ｍ，封闭层以下为异常超高压，盆参２井在封闭层上下１３００ｍ的井段有油气垂向运移和混源特征。这种高压和异常高压对盆地腹部的油气生成和聚集有明显控制作用。本文应用“流体封存箱”理论探讨异常高压环境中的油气成藏模式。