风道阀门流量性能的试验研究

分析了通风系统风道阀门的性能特征,阐述了风道阀门全开时的流阻系数,关闭状态下的内泄漏量和调节阀流量特性的试验原理及试验方法,并给出了试验数据计算的实例。     

调节阀流量调节理论研究

对调节阀固有阻力特性进行了分析，推导出调节阀固有阻力关系式，提出了衡量调节阀阻力的特征阻力概念，对调节阀安装特性进行了分析，得到调节阀流量调节方程式。依调节阀的结构特点将调节阀的开度划分为有效行程区、无效行程区和强调区三个区域。提出了界点的定义，得到在安装状态下，调节阀界点下移的结论。     

调节阀选型应注意的问题

调节阀选型应注意的问题通常，调节阀是根据工艺参数计算出其流通能力，并按照压差值来选择。由于调节阀内部结构的不同，往往使由计算值而选择的调节阀不实用。因此，在调节间选择时应该考虑以下问题。１．结构图１是普通的调节问。该间能满足ＡＮＳＩ标准中要求的全部压...     

三通式电动调节阀

介绍了三通式电动调节阀的设计思路、特性原理、结构特点和应用。叙述了该阀门相对于二通式电动调节阀的先进性。     

蝶阀流量特性曲线在V形滤池恒水位控制中的应用

为减少V形滤池滤后水调节阀的动作频率,通过采用SIPARTPS2智能型定位器,对蝶阀的流量特性曲线进行校正,同时对PLC程序优化调整,使蝶阀工作在良好的状态下,降低了维护费用,保证了滤池系统稳定运行。     

瓦斯抽采流量控制阀体的优化设计研究

针对现有瓦斯抽采孔口流量控制阀门多为钢铁铸件以及安装繁琐、笨重、易生锈、调节精度不高的缺点,设计一种新型工程塑料材质的流量调节阀,通过方案优化选型及数值模拟,确定最终方案.优化设计后的阀门具有质量轻、不易腐蚀、调节精度高和可重复利用等优点,对多煤粉多水的抽采孔具有良好的适用性.     

恰希玛核电站上充流量调节阀产生气蚀的原因分析及改进措施

主要通过恰希玛核电站的上充流量调节阀在现场调试和运行期间所遇到气蚀问题的分析，介绍该阀门运行工况的特殊性，并如何使该阀门满足系统的工况要求。     

智能阀门定位器的流量特性实现研究

智能阀门定位器包含直线、等百分比、快开和用户设定等流量特性,用户可以自由设定。根据气动薄膜调节阀的特点,阀杆位移的变化与旋转电位器的变化呈非线性关系,通过非线性修正方法对阀位反馈进行修正。采用曲线拟合的方法,得到流量特性曲线方程,最终实现了智能阀门定位器直线、等百分比和快开流量特性,达到更高精度的流量控制要求。     

调节阀流量关系变形特性分析

以阻力计算为基础,建立了调节阀的流量调节方程、工作流量变形方程和固有流量关系式。应用理想流量关系,对调节阀的工作流量特性进行了系统的分析     

调节阀阻力特性分析

应用流动阻力计算理论,系统分析调节阀的阻力特性。在对调节阀的结构和流量调节特性分析的基础上,提出了衡量调节阀阻力特性的方法和特征参数。     

一种电液数字流量控制阀的开发研制

介绍作者自行研制的一种电液数字流量控制阀的工作原理、技术参数、性能测试、特点与适用领域。     

调节阀的选择与安装

介绍了通过选择调节阀的类型、口径和流量特性以达到正确选择调节阀的目的,以及如何正确安装调节阀。     

2D数字式P—Q阀

文章介绍了一种新型的２Ｄ数字式Ｐ－Ｑ阀的结构原理及控制方法,实验结果表明该阀具有良好的流量和压力控制特性,此外,与传统的Ｐ－Ｑ阀相比,该阀还具有结构简单及可直接数字控制等优点。     

Pressure control of hydraulic servo system using proportional control valve

The purpose of this study is to develope a control scheme for the hydraulic servo system which can rapidly control the pressure in a hydraulic cylinder with very short stroke. Compared with the negligible stroke of the cylinder in the system, the flow gain of the proportional pressure control valve constituting the hydraulic servo system is relatively large and the time delay on the response of the valve is quite long. Therefore, the pressure control system, in this study tends to get unstable during operations. Considering the above mentioned characteristics of the system, a two-degree-of-freedom control scheme, composed of the I-PDD²… feedback compensator and the feedforward controller, is proposed. The reference model scheme is used in deciding the parameters of the controllers. The validity of the proposed control scheme is confirmed through the experiments.     

A study on the characteristics of in-cylinder intake flow in spark ignition engine using the PIV

In this study, to investigate m-cyhnder tumble or swirl intake flow of a gasoline engine, the flow characteristics were examined with opening control valve (OCV) and several swirl control valves (SCV) which intensify intake flow through steady flow experiment, and also turbulent characteristics of m-cyhnder flow field were investigated by 2-frame cross-correlation particle image velocimetry (PIV) method In the investigation of intake turbulent characteristics using PIV method, the different flow characteristics were showed according to OCV or SCV figures The OCV or SCV installed engine had higher vorticity and turbulent kinetic energy than a baseline engine, especially around the wall and lower part of the cylinder Above all, SCV B type was superior to the others About energy dissipation and reynolds shear stress distribution, a baseline engine had larger loss than OCV or SCV installed one because flow impinged on the cylinder wall It should be concluded, from what has been said above, as swirl component was added to existing tumble flow adequately, it was confirmed that turbulent intenstty was enlarged, flow energy was conserved effectively through the experiment In other words, there is a suggestion that flow characteristics as these affected to m-cyhnder combustion positively     

轴向柱塞泵非止点配流窗口过渡区压力脉动特性分析

为能用单台泵直接闭式控制差动缸运动,把轴向柱塞泵的吸油配流窗口改为两个独立的窗口,一个连接差动液压缸的有杆腔,另一个连接低压油箱,用于平衡差动缸的面积比,但柱塞通过这两个配流窗口之间的过渡区时,因处于泵的非止点位置,柱塞腔容积变化较大,引起大的流量和压力变化,产生大的噪声,为了减小其影响,需要对柱塞通过此过渡区域的特性进行分析.为此,采用仿真软件SimulationX,建立柱塞通过配流窗口的仿真计算模型,对单个柱塞腔内部以及泵输出油口压力和流量动态过程进行仿真,综合运用减震三角槽、阻尼孔和等效预压缩角三种措施,减小泵的流量和压力脉动.通过仿真计算,确定出合理的配流盘结构参数.在此基础上,进一步制造出样机,对泵的压力脉动特性进行试验测试,验证仿真结果及设计参数的正确性.研究工作丰富了柱塞泵的类型.     

冷却液箱温度自动控制的研究

介绍了一种经济实用的水冷油箱控制方法,即采用自来水通过热交换器进行油液冷却,并研制了一种自动控制的温控阀,对其进行了原理上的分析.该装置值得在国内推广使用.     

磨料浆体流针阀体研磨技术研究

提出了一种基于磨料浆体射流技术的针阀体喷孔研磨技术。该技术利用针阀体喷孔的节流作用使射流发生,靠浆料的研磨作用来去除针阀体内流道毛刺,对喷孔孔口进行倒角,以提高其流量系数。加工时,通过流量控制系统实时监测、控制针阀体的实时流量与终止流量,来控制其流量离散度。实际加工实验表明,该技术可以提高针阀体流量系数到0.85左右,同批针阀体流量离散度控制在±1%以下,达到国外同类技术的先进水平。     

Optimal design and development of electromagnetic linear actuator for mass flow controller

In this paper, we constructed the analytic model of control valve as a function of electric and geometric parameters, and analyzed the influence of the design parameters on the dynamic characteristics. For improving the dynamic characteristics, optimal design is conducted by applying sequential quadratic programming method to the analytic model. This optimal design aims to minimize the response time and maximize force efficiency. By this procedure, control valve can be designed to have fast response in motion.