阀杆软填料密封性能分析及结构设计

分析了阀杆软填料密封结构存在的问题，对外部压紧软填料密封和内部压紧软填料密封性能进行了理论分析和对比试验。结果表明，内部压紧填料密封性能估于外部紧软填料密封。综合两种密封结构的优点，设计了阀杆双向压紧软填料密封结构，并分析了其密封性能。     

液压泵变量机构指示杆和密封结构的改进

介绍了斜盘式轴向柱塞泵变量机构指示杆和密封结构的设计改进,以提高产品可靠性与维护便利性。阐述了指示杆密封失效的原因及维护困难性,改进设计了指示杆和密封结构。进行了改进后的变量机构的耐久性试验,验证了设计改进的有效性。     

发动机气门杆密封的优化

气门杆密封使经过气门杆和密封唇的油量保持在一个合适的水平（既不能太多，也不能太少），这样才能既使气门杆和气门导套间得到充分润滑，又不会使气门杆上结碳；同时气门杆密封还必须承受很高的压力。这些要求可以通过合理确定密封唇的参数及特殊的主副密封唇气门杆密封结构来实现。     

平板闸阀阀杆密封结构的改进

分析了平板闸阀阀杆密封产生外漏的原因及其存在的问题,改进了阀杆密封结构。     

深海阀门阀杆填料密封结构的研究与设计

通过对常规阀门几种不同阀杆填料密封结构的分析,然后针对深海的特殊工况,设计出了满足内外受压的深海工况的多重密封的阀杆填料密封结构,为水下阀门的密封提供可靠保障。     

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。     

强制密封球阀阀杆导向结构的优化设计

介绍了强制密封球阀的性能和使用工况,分析了2种强制密封球阀阀杆导向结构存在的缺陷,提出了阀杆导向结构优化设计及采用黄铜套减磨降低开关力矩的方法,解决了阀杆易产生应力集中、易磨损、易断裂和难加工等问题。     

可调式密封填料结构

可调式密封填料结构旅顺阀门厂周国全在阀杆（轴）的密封填料处，填料与填料函内壁的间隙密封称为静密封，填料与阀杆（轴）之间相对运动的密封称为动密封，动密封是决定密封性能的关键。采用可调式密封填料结构（图），可使密封件均衡受力，保证密封。可调式密封填料结构...     

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。     

基于直通式迷宫密封的海上平台井口装置研究

海上稠油开采面临瓶颈,而平台有杆采油技术是解决这一难题的合适途径。油井安全是海上平台有杆采油新工艺实施的前提和关键,基于新工艺开发了海上平台复合井口装置,可实现正常作业动态密封、断杆自动关井、停产手动封井等功能。基于流体动力学理论建立了井口密封泄漏模型,分析了密封结构各参数对泄漏量的影响,确定了密封本体结构,在0.1 mm间隙、10 MPa井口高压下泄漏量为2728×10-5 m3/s。说明密封结构设计合理,能够达到关井密封井口、撤离平台的目的,以确保海上稠油热采井有杆采油新工艺的安全实施。     

舰船艉轴密封填料的试验研究

介绍了舰船艉轴密封的特点和要求，分析了舰船艉轴填料密封的结构形式和实效，在比较、试验和筛选密封填料材料的基础上，采用了两种编织形式的合成纤维复合填料，并通过实船试验，取得了良好的密封效果。     

关于某气门油封脱落的原因分析及改进

针对新项目发动机SOP阶段装配线安装气门时,发生气门油封脱落现象故障率较高的情况,通过人机料法环分析得出气门油封脱落的主要原因,并根据分析的结果对油封结构进行优化改进,最后在发动机生产实践验证改进的正确性。     

广州蓄能水电厂B厂机组导叶轴套密封漏水故障分析与处理

以广州蓄能水电厂B厂机组为例,介绍导水机构中导叶轴套及轴套密封的结构构成,对导叶轴套密封漏水故障进行分析,找到了故障的具体原因,并实施了相应的处理和预防措施。     

可带压更换的阀杆密封套

介绍了一种新型的可带压更换阀杆密封的结构,分析了该结构的优良性能。     

低温球阀阀杆密封填料的试验与研究

通过试验测试了阀杆柔性石墨与聚四氟乙烯复合填料的低温性能,介绍了复合填料的装填方式及防止填料挤入阀杆孔弧形挡圈的使用。     

电站锅炉给水调节阀的减摩分析

电站锅炉给水调节阀的阀杆密封采用柔性石墨填料，既降低了摩擦力，又为调节阀的运行节约了能源。     

Radial stress distribution and friction forces in a soft-packed stuffing-box seal

This paper presents a theoretical analysis and experimental results concerning distribution of radial (contact) stresses at the packing-stem and the packing-housing interfaces, deformation of the packing in the mounted condition (the stationary stem, without pressure of the medium) and friction forces in the operating condition (the reciprocating stem, with pressure of the medium) in a soft-packed stuffing-box seal.The derived formulae and experimentally determined material parameters for plaited PTFE-impregnated asbestos packing can be used in the design of soft gland packings, particularly industrial fittings such as valves and gate valves.     

Numerical techniques for computing nonlinear dynamic characteristic of rotor-seal system

A transient CFD procedure to compute the nonlinear dynamic characteristic of the coupled rotor-seal system was presented in this study. In each time step, the displacement diffusion model was implemented to govern the mesh deformation, and the URANS (Unsteady Reynolds averaged Navier-Stokes) equations were solved to obtain the transient fluid force on the rotor surface for the free vibrations. With the obtained fluid force from the CFD solver, the nonlinear equations of motion for a simplified rotor-seal system were numerically solved on the basis of external user defined routines. During each transient time step, the computed fluid force from the CFD solver and the rotor motion from the user defined routines were transferred to each other timely. The rotor center trajectories, frequency spectrum and projection of Poincaré section were calculated to investigate the nonlinear dynamic performance of the single disk rotor-seal system. The effects of the rotational speed and pressure ratio on the vibration characteristic of the rotor-seal system were analyzed by the bifurcation theorem. The results show that the coupled rotor-seal system experiences a period-one motion, resonance, periodic-doubling motion, quasi-periodic motion, and finally possible chaotic motion as the rotor speed increases. The pressure ratio has pronounced effect on the frequency response of the first-order critical speed; however, it has little influence on the motion state as well as the frequency response of the rotating speed. Although a constant-clearance annular smooth stator seal was selected as the research object in the current paper, the presented transient CFD method is still available for other complex annular seals, such as labyrinth seal, honeycomb seal, pocket damper seal, etc.     

H2S风机密封结构分析与设计

针对H_2S风机密封的要求,分析对比了骨架密封、机械密封、抽气密封、充气密封的优缺点,设计了一种新型三瓣环碳环密封 抽气密封 充气密封的组合密封。