强制密封球阀的设计与优化

强制密封球阀是一种利用凸轮机构原理实现阀门无摩擦启闭的新型管线球阀,它通过阀杆强制机械力来建立可靠的密封,其是一种设计理念先进、密封结构新颖的高性能球阀。本文主要介绍强制密封球阀的工作原理、力学分析、结构设计及优化方法。     

浅谈强制密封球阀结构参数设计

对强制密封球阀结构参数设计进行探讨,分别从球体密封面的宽度余量、球体与阀盖/阀体之间的空间余量、阀杆扁方斜面的长度、阀杆斜面扁方的厚度等方面进行参数设计,从而确保产品性能。     

一种可在线检漏的双半球硬密封球阀结构设计

强制密封球阀是油气输送管道、站场计量检定等领域的核心设备之一。针对进口ORBIT轨道式强制密封球阀只能实现单向密封、背压楔紧力不足等结构设计缺陷,设计了一种可在线检漏的双半球硬密封球阀。采用分体式球体结构设计理念实现了双阀座双向强制密封。经过严格计算优化的阀杆楔形锥体镂空结构,能够对称撑开球瓣,双向受力平衡,使阀门的机械楔紧力与背压密封效果大大提升。该球阀拓展了轨道式球阀的设计思路,提升了产品性能及使用寿命,促进了轨道式强制密封球阀国产化高质量顺利完成。     

一种高压球阀阀杆的密封设计改进

针对常见球阀阀杆密封寿命低的问题,进行了分析和改进,设计了一种长寿命的高压球阀阀杆密封结构,并通过了试验验证。     

一种球阀阀杆密封渗漏分析与优化

管道球阀作为一种承压部件,阀杆密封泄漏问题是球阀的主要故障所在,直接影响着成品油运输的安全稳定与工作,所以,对阀杆密封泄漏成因与预防的分析及结构优化就显得尤为重要和非常有意义.     

铸石球阀阀杆密封结构的改进

分析了铸石球阀阀杆密封泄漏的原因，介绍了对其密封结构及密封圈形状和材料的改进方法。     

超低温轨道式球阀密封补偿结构设计计算

为补偿工况温度发生变化时超低温轨道式球阀密封面应力的变化,提出一种可用于超低温工况的轨道式球阀密封补偿结构。该密封补偿结构根据轨道式球阀自身的传动特点,将阀杆设计为两段式,并在上下阀杆组件之间设计有弹性件,在工作过程中利用弹性件的蓄能作用,实时补偿由于温差引起的密封变形问题。介绍该补偿结构的设计计算方法,并通过仿真计算证实该密封补偿结构在低温下可大大提高密封的可靠性。     

仪表球阀设计制造要点浅析

从应用的角度描述了弹性补偿密封结构仪表球阀的优势,阐述了弹性补偿密封结构的基本原理;着重从关键零部件的材料选择、整体结构强度、强度试验、弹性阀座密封、阀杆密封等方面分析了仪表球阀设计制造过程中的重点、难点以及容易导致产品性能降低的因素。     

球阀阀杆密封结构的改进

1概述我公司20世纪80年代从德国引进了KH型球阀产品,该阀用棒料加工而成,体积小,质量轻,结构紧凑,操作灵活,表面经过抛光,外观漂亮,深受用户的喜爱。但有些球阀使用一段时间以后,阀杆处的减磨密封垫容易渗漏,为此,对阀杆密封结构做了改进,经过试用效果良好。2结构改进图1为球阀     

一种新型无摩擦球阀的设计

球阀是一种新型阀门,不仅结构简单,密封性能良好,而且在一定的公称通径范围内体积较小、质量轻、材料耗用少、操作简便,是近几年发展速度最快的阀门品种之一。但随着球阀的开关次数增加,球体与阀座表面会有不同程度的磨损,进而会使球阀的密封性能下降。介绍球阀的一种新型密封结构,该结构不仅可以实现球阀在启闭过程中球体无摩擦转动,还可以有效避免球体与阀座表面的磨损,而且能减小阀杆与执行元件所承载的扭矩,同时降低了对阀杆强度的要求。     

煤化工用金属密封球阀的选型及应用

介绍了在煤制油工艺过程中金属密封耐磨球阀的选型和市场需求及应用领域,分析了金属密封浮动球球阀和固定球球阀的结构特性和选型及应用。     

硬密封球阀耐冲蚀陶瓷涂层研究

利用多功能超音速火焰喷涂技术，在金属硬密封球阀的阀芯上制备了WC-12Co金属陶瓷涂层，用于提高球阀的耐冲蚀磨损性能。试验表明，涂层机械力学性能好，与基体结合强度超过70MPa，孔隙率小于2％，硬度超过HV1000，耐冲蚀磨损性能比基体提高5倍以上，有效地提高了球阀的使用寿命和密封可靠性。     

PTA装置用高温耐磨金属密封球阀的研究

介绍了PTA装置中氢溴酸腐蚀性强、温度高、冲蚀强及颗粒硬度高等特点。研究设计出了相应PTA装置用抗氢溴酸强腐蚀、耐高温、耐磨损的哈氏C合金密封比压高并具有自洁功能的金属密封球阀。     

纯电动汽车一体化动力总成非接触式密封结构设计

纯电动汽车一体化动力总成普遍使用的油封因与轴为抱紧滑动密封,在长期磨损、老化后容易失效,且不容易更换,同时在电机高速运转时,因线速度较大,油封无法满足设计要求。针对此问题,设计一款适用于纯电动汽车一体化动力总成的非接触式新型密封结构。该密封将动环和静环集成在一起,中间形成迷宫结构,并在动、静环之间增加了浮动环。通过模拟仿真及实验验证了该非接触式新型密封结构达到设计预期功能,可靠性较常规油封密封有明显提升,且结构更加紧凑,有效提升了一体化动力总成生命周期内的可靠性。     

海工装备液压缸多重组合式密封结构设计与仿真分析

针对单个密封圈易磨损导致密封失效,且更换密封件过程繁琐的不足,设计多重组合式密封结构。该设计在单个密封圈密封结构的基础上,在活塞杆内侧设置两个起缓冲作用的密封圈,在缸底增加一个密封圈,构成多重组合式密封结构。通过有限元仿真,分析在均匀分布的不同压力下,单密封圈密封结构和多重组合式密封结构中的密封圈随着活塞杆往复运动时,密封圈的最大承载与受挤压形变,探究密封圈使用寿命和应力集中区域的变化。结果表明：多重组合式密封结构能够有效减小密封圈所承载的压力,密封圈使用过程中无明显挤压磨损现象,使用寿命延长,验证了多重组合式密封系统的有效性与可行性。     

Study on the design of ball valve based on elastic ring valve seat structure and fluid characteristics and fatigue strength

Aimed at the technical problems such as the influence of granular medium on spring pre-tightening force sealing, a new ball valve based on elastic ring valve seat structure is studied. The spring plate type valve seat structure is designed to cooperate with the ball core for sealing, and the blade spring coil is used to cooperate with the ball core for sealing in the spring plate type valve seat structure. Wherein the supporting back ring supports the blade leaf spring on the outer side to enhance and protect the role of the blade spring coil. The design without the spring cavity avoids the problem of sealing failure caused by medium entering into the spring cavity and affecting the compression spring, and avoids the situation that the valve seat can be sealed with the ball core by pre-tightening the compression spring, thus avoiding the problem of sealing failure caused by the valve seat sticking on the valve body. The mechanical and flow characteristics are studied and analyzed by the ball valve characteristic test system. The stem torque, unbalance torque, flow characteristics and flow coefficient variation at different nominal diameters are analyzed. The seal allowable squeeze stress and seal surface pressure are analyzed, and the seal is stable and reliable with the seal pressure meeting the seal design criteria. The fluid dynamics simulation analyzes the velocity, pressure and flow traces of the fluid flowing through the ball valve under three opening degrees: fully closed, half open and fully open, the maximum velocity-pressure and opening degree variation curves of the inlet and outlet, the maximum velocity-pressure and opening degree variation curves of the inlet and outlet under different nominal diameters and the flow resistance coefficient curves. Static strength analysis was done for the ball core and spring plate seat structure to obtain the stress, displacement, strain and safety factor. The fatigue strength of the ball spool and spring-loaded plate seat structure was analyzed, and the total number of lives (cycles) and load factors were obtained, and the results show that the fatigue strength of the ball spool and spring-loaded plate seat structure is safe and the fatigue strength meets the requirements. Ball valve pressure test, low pressure sealing test and high pressure sealing test, valve body strength and ball valve sealing performance all meet the requirements.     

Polyimide Composite Retainer Materials Optimized for Minimal Wear and Film Transfer

To reduce torque and torque noise, the designers of sputtered MoS₂ film-lubricated precision ball bearings must avoid the use of self-lubricating composite retainers which exhibit high wear and film transfer rates. To develop an essentially benign ball separator with minimal, ball pocket wear and polymer transfer film formation, the tribological behavior of two chemically homologous polyimides were optimized by blending with solid lubricant additives, as guided by a Taguchi design of experiments approach. The study employed an L9 fractional factorial lest matrix design with analysis of variance calculations. A fluorinated and a non-fluorinated version of a commercially available polyimide were compounded with two types of powdered solid lubricants, using three levels of filler content. The results of flat-on-flat oscillatory wear tests performed with these composites sliding against 440C bearing steel were analyzed and compared with the wear rates of two commercially available polymeric composite retainer materials. The results of the optimization study indicated that the composite with the lowest wear consisted of the fluorinated Polyimide B filled with 7.5%, by volume, of molybdenum disulfide (MoS₂). Its wear rate was substantially below that of the two commercial retainer materials. Analysis of variance calculations showed that all three factors, i.e., polyimide type, filler type, and filler content, proved to be significant in reducing the wear of these retainer candidates.     

端面刷式密封的研制及特性分析

针对常规刷式密封存在的转子易磨损、刷丝之间的间隙随半径的增大而增大,进而造成空隙率不均、后挡板与转子之间的间隙大小受到转子径向跳动的限制等问题,研发了一种用于气体密封的新型端面刷式密封结构,将常规型刷式密封的摩擦面由转子表面转移到与转轴垂直的端面上.端面刷式密封具有摩擦无法对转子造成破坏、刷丝排列更紧密,刷丝区孔隙率均匀、适用于更大的转子偏移、结构上有更多的选择性等特点,使密封效果更好.     

PTA用钛合金硬密封球阀密封结构设计与分析

以典型项目钛合金硬密封球阀为例,介绍了PTA用钛合金硬密封球阀的技术现状、设计标准等。对密封结构进行设计,并计算所需密封力。结合理论计算进行有限元分析,对钛合金硬密封球阀的阀座密封结构和密封比压进行设计与分析研究。