焦炉调节阀气动系统设计

焦化厂焦炉的炉膛压力是决定焦炭质量的主要因素之一,炉膛压力一般由执行机构带动调节阀来实现控制.结合现场要求设计了一套气动控制系统来控制阀门的开度.该文就系统组成和主要部件的工作原理进行了详细描述.经过现场安装调试,能满足现场工作温度、控制成本低和控制时间短的要求.     

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。     

一种气动减温水调节阀的改造

通过应用先进的笼套式气动减温水调节阀和节能智能电气阀门定位器大幅提高锅炉减温水系统运行可靠性,取得很好的经济效益,是电力行业替代老式减温水调节阀的理想产品.     

HTP气动阀门定位器故障维修

ＨＴＰ气动阀门定位器（以下简称ＨＴＰ定位器）是日本山武－霍尼韦尔公司气动调节阀的主要附件,这是一种单输出的阀门定位器,有正作用与反作用两种形式。气动调节阀配备阀门定位器,能够克服流体不平衡力与阀内零件磨擦力等阻力,使执行机构按照调节器的输出信号工作,...     

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。     

调节阀设计计算选型导则（一）

正确选取调节阀规格型号,必须充分了解调节阀门的流量特性及其实际运用中的畸变。在阀径计算和选型时关键在于正确选取用于计算的流量值和阀前后差压。     

气动调节阀流量特性研究与试验分析

受管道阻力损失影响,气动调节阀的理论流量曲线会发生偏离,固有流量特性在大压差下更容易发生畸变。从理论和试验室条件下的试验数据,分析了曲线偏离的原因,提出在进行调节阀流量试验前,应根据试验室的资源条件提前确定阀门的临界压差,从而保证试验数据的准确性。     

气动温度薄膜调节阀的设计研究

阀门设计一般按照阀门承压能力和接管要求进行设计,这常使得阀门的控制工艺特性与实际控制需求不匹配,进而造成阀门使用控制的特性偏差。文中以气动薄膜调节阀设计为例,研究了按照阀门控制工艺特性进行设计的方法,可使阀门控制特性相互匹配,减小控制偏差,更好地满足生产工艺控制需求,对提高和改进阀门的设计性能和控制性能具有重要的指导意义。     

Design of a two-dimensional proportional solenoid for miniature directional control pneumatic valves

In this paper, a new proportional solenoid invented for pneumatic directional control valves is introduced. The new proportional solenoid has two-dimensional structure and a pivoting armature on which the friction force is inherently negligible. Another advantageous feature of this solenoid is that its mechanical parts can be easily manufactured and assembled. The working principle and design example of the now proportional solenoid, its application to the activation of a 4/3-way directional control valve, and the evaluation of its control performance in a position control loop are reported.     

阀门在气力输送系统中的应用与选择

介绍了气力输送系统中的常用阀门,及各类阀门的性能比较。     

Research on the measuring characteristics of a new design butterfly valve flowmeter

Flowmeters and control valves are important components of flow measurement and control in heating, ventilating, and air conditioning (HVAC) system, which directly or indirectly impact building room comfort and energy costs. Valves as resistance components produce differential pressure which in turn can be used for flow measurement. This paper studies the function among valve opening position, pressure difference and flowrate of a new designed butterfly valve. The flow model of the butterfly valve is established based on the Bernoulli equation, the discharge coefficient C under different valve opening conditions are studied by CFD simulations and verified by experiments. The simulation results show that the discharge coefficient C reached a stable value of 0.67–0.70 as Reynolds number exceeded 5000, and the permanent pressure loss ratio is range from 0.95 to 0.37 corresponding to opening range from 10° to 70°. The correctness of the simulation results of C is verified by experiments, in which C is about 0.60. With the corrected values obtained from experiments, the simulation results are instructive to practice. The new designed butterfly valve flowmeter can be used efficiently in HVAC system, especially in variable air volume (VAV) air conditioning system. And the work of this paper offers a reference for other types of valve flowmeters in fluid control processes.     

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。     

基于Fluent的调节阀内部流场数值模拟

建立了调节阀内部流场三维模型,采用通用CFD软件Fluent对其内部复杂流场进行了三维粘性数值模拟,通过对调节阀流量系数模拟值与理论值的比较,表明应用Fluent对调节阀进行模拟计算是可靠的,为调节阀结构改进提供了理论依据.     

基于高速开关阀的气动执行器位置伺服控制

本文使用一种五点开关PWM控制算法对高速开关阀控气动执行嚣进行位置伺服控制。分析了开关阀的启闭滞后现象。并提出了一种修正方法，该方法可有效地消除系统的静态误差。实验结果表明。用高速开关阀可以实现快速、精确的气动执行器位置伺服控制。     

多尺度特征自适应融合的气动控制阀故障诊断

气动控制阀作为过程工业典型的终端执行机构,由于故障发生率高、故障类型繁多,导致故障识别难度大,且故障后果严重,因此对其进行智能的故障检测和诊断具有重要的实际意义。 本文提出了一种多尺度特征自适应融合网络用于气动控制阀故障诊断。 首先,搭建了融合自注意力机制的多尺度特征提取网络自动提取信号的空间特征和细节特征。 然后,设计了权重自适应特征融合网络对多尺度特征加权融合,提高模型对故障特征的表征能力。 最后,由长短时记忆神经网络和 SoftMax 函数实现特征识别和故障分类。 实验结果表明,该模型在 DAMADICS 阀门基准实验平台上的平均检测准确率达到 96. 82% ,均高于其他对比模型。 与最近发表文献中的检测结果对比发现,本文开发的模型在可检测的故障数量和检测准确率方面也具有一定的优势,并且通过实验验证了模型的检测性能。     

电动调节阀的使用和维修

该文主要介绍了电动调节阀的安装注意事项、常见故障及原因分析，以保障电动调节阀的正确使用和维修。     

加氢装置用阀门的材料选择与质量控制

介绍了加氢装置用阀门材料的选择依据、材料的质量控制要求以及材料必做的检验项目。     

Intelligent switching control of pneumatic cylinders by learning vector quantization neural network

School of Mechanical and Automotive Engineering, University of Ulsan, San 29, Muger2-dong, Nam-gu, Uhan 680-749, Korea The development of a fast, accuiate, and inexpensive position-controlled pneumatic actuator that may be applied to various practical positioning applications with various external loads is described in this paper A novel modified pulse-width modulation (MPWM) valve pulsing algorithm allows on/off solenoid valves to be used in place of costly servo valves A comparison between the system response of the standardPWM technique and that of the modified PWM technique shows that the performance of the proposed technique was significantly increased A state-feedback controller with position, velocity and acceleration feedback was successfully implemented as a continuous controllei A switching algorithm foi control parameters using a learning vector quantization neural network (LVQNN) has newly proposed, which classifies the external load of the pneumatic actuator The effectiveness of this proposed control algorithm with smooth switching control has been demonstrated thiough experiments with various external loads