泄压阀动作特性的分析

通过对泄压阀的动作特性分析,优化了阀门的结构,提高了泄压阀的使用性能和寿命。     

用于低压储罐保护的压力真空泄放阀

介绍了压力真空泄放阀的工作原理、类型及口径的确定。     

多喷孔泄压阀的应用

分析了普通阀门在高压差泄压系统使用中出现的问题,提出了采用多喷孔泄压阀的方案,介绍了多喷孔泄压阀结构型式、优点和工作原理。     

先导式水击泄压阀的试验研究

介绍了先导式水击泄压阀的结构特点和工作原理,论述了阀门动作特性和流量特性的试验方法和结果。     

闸阀异常升压的危害与防护

分析了常用闸阀中腔异常升压的形成机理及其危害性,提出了平衡中腔异常升压的设计或安装中的实用防护方案,可供各类用户参考选择.     

控制阀在异构脱蜡装置上的应用

介绍了大庆炼化公司异构脱蜡装置的情况及装置所用仪表控制阀的情况。     

汽车涡轮增压系统泄压噪声分析及控制

涡轮增压系统在改善汽车动力性和燃油经济性的同时也带来了严重的噪声问题。为控制汽车涡轮增压系统泄压噪声,综合运用计算气动声学方法和动网格技术,分析泄压工况下泄压阀的准稳态响应和涡轮增压系统的瞬态响应,并结合宽带噪声源模型和声类比方法获取涡轮增压系统泄压噪声特性,揭示汽车涡轮增压器连续瞬变工况下泄压噪声的产生原因,明确泄压噪声强度与进气质量流量的关联。泄压噪声主要由壁面涡脱效应引起,呈现宽频特征,且声源强度随质量流量减小而降低。鉴于此,提出通过改进泄压阀结构进行进气质量流量控制进而实现泄压噪声控制,并对泄压阀结构进行改进设计。仿真分析结果表明改进后强声源区域明显减少,总声压级平均降低约24dB,泄压噪声得到有效控制。改进样件装车试验亦验证控制措施的有效性。该研究为涡轮增压系统泄压噪声分析与控制这一行业难题的解决提供有益参考。     

新型压机充液阀的设计

为提升全自动液压机的工作效率,设计了一种新型的充液阀。该充液阀具有自适应的多级卸压结构,达到预定压力时阀芯逐级开启实现快速卸压。整个机械式卸压过程稳定性好、可控性强,同时因无需外加独立的泄压装置,工作效率高,尤其适用于高压大流量的压制工况。     

全启式气瓶泄压阀

介绍了利用泄压阀和爆破片的各自特点研制出的一种可用于焊接气瓶的无泄漏全启式泄压阀的结构特点及工作原理。     

硅化工用球阀损坏分析及盘阀的应用

阐述了硅化工下料装置的工艺要求,分析了球阀的损坏机理,介绍了盘阀的使用情况。     

压缩机气阀损坏机理及预防措施分析

本文介绍了压缩机气阀损坏的原因及机理,并提出了预防气阀阀片损坏的措施,延长了气阀的使用寿命,保证压缩机的正常运行.     

Experimental and numerical studies on erosion damage in damping holes on the valve plate of an axial piston pump

Journal of Mechanical Science and Technology - Erosion damage affects the reliability and durability of axial piston pumps. An axial piston pump was tested using endurance life testing method. The...     

Effect of axial pinch on the porous walled squeeze film with velocity slip

The problem of studying the effect of axial current induced pinch on squeeze film behaviour with velocity slip between two annular disks, the upper disk having a porous facing, is analysed. Analytical results are obtained for pressure distribution, load capacity and time-height relations. The pinch effect considerably modifies the action of the squeeze film.     

Axial pinch effect on the squeeze film action between curved circular plates

The axial current-induced pinch effect on the action of the curved squeeze film between two circular plates, when the upper plate moves normal to itself and approaches the lower plate with uniform velocity, was studied. Expressions were obtained for the pressure distribution and the loadcarrying capacity and a relationship between the time and the film thickness was obtained. It was found that increases in the pressure, the load capacity and the time of approach did not depend on the concavity or the convexity of the pads.     

The effect of axial current-induced pinch on the squeeze-film behaviour of porous circular disks

An analysis is presented of the effect of axial current-induced pinch on the squeeze-film behaviour between two circular disks when the upper disk which has a porous facing and is parallel to the stationary non-porous disk, moves normal to itself on approaching the lower disk. The analytical results for the pressure distribution, the load-carrying capacity and the film thickness as a function of time are obtained and the effect of pinch on these characteristics is studied. It is found that a load proportional to the square of the axial current can be sustained even when there is no flow.     

基于ADAMS的平移式模具输送机构压轮的仿真分析与研究

介绍了一种平移式模具输送机构, 建立了模具输送机构及压轮的仿真模型,通过测量观察各个模具之间间隙、模具位移、速度等变化曲线,对缓冲压轮的安装位置区域进行仿真分析,最终得出了最优的缓冲压轮的安装位置,使模具在平动碰撞过程中的间隙明显减小,避免了因模具之间过大间隙而产生的冲击碰撞.解决了模具不到位的问题,对模具平动起到了缓冲作用,保证了设备的运行.为平移式模具输送机构的设计提供了必要的参考.     

The effect of axial pinch on the squeeze film action between curved annular plates

A theoretical study is presented of the effect of pinch induced by an axial current on the behaviour of the squeeze film of an electrically conducting lubricant between curved annular plates. The film thickness is assumed to be an exponential function of the radial coordinate. The expressions for the pressure, load-carrying capacity and squeeze time as functions of film thickness are obtained. With a convex plate configuration, axial-current-induced pinch decreases the pressure and load capacity. For a concave plate configuration the pressure increases with increase in current for large values of the dimensionless curvature parameter $\text{}\text{?}$gb while the trend is reversed for small values of $\text{}\text{?}$gb.     

熔融纺丝用夹套管的设计及柔性分析的探讨

重点介绍熔融纺丝中夹套管的设计特点及柔性改进的方法,通过对两种夹套管的结构及应力分析计算,得出管路系统的柔性设计是设计中应考虑的重点,为使分析结果满足标准规范的要求,必须对管道进行应力分析,以达到管道设计的安全性。