Development of a Novel Parallel-spool Pilot Operated High-pressure Solenoid Valve with High Flow Rate and High Speed

High-pressure solenoid valve with high flow rate and high speed is a key component in an underwater driving system.However,traditional single spool pilot operated valve cannot meet the demands of both high flow rate and high speed simultaneously.A new structure for a high pressure solenoid valve is needed to meet the demand of the underwater driving system.A novel parallel-spool pilot operated high-pressure solenoid valve is proposed to overcome the drawback of the current single spool design.Mathematical models of the opening process and flow rate of the valve are established.Opening response time of the valve is subdivided into 4 parts to analyze the properties of the opening response.Corresponding formulas to solve 4 parts of the response time are derived.Key factors that influence the opening response time are analyzed.According to the mathematical model of the valve,a simulation of the opening process is carried out by MATLAB.Parameters are chosen based on theoretical analysis to design the test prototype of the new type of valve.Opening response time of the designed valve is tested by verifying response of the current in the coil and displacement of the main valve spool.The experimental results are in agreement with the simulated results,therefore the validity of the theoretical analysis is verified.Experimental opening response time of the valve is 48.3 ms at working pressure of 10 MPa.The flow capacity test shows that the largest effective area is 126 mm2 and the largest air flow rate is 2320 L/s.According to the result of the load driving test,the valve can meet the demands of the driving system.The proposed valve with parallel spools provides a new method for the design of a high-pressure valve with fast response and large flow rate.

Simulation research on dynamic performance of the new type high-pressure solenoid valve

To improve energy density,the transportation,storage,and operations of hydrogen,methane,and compressed air vehicles currently require high-pressure compression.High-pressure solenoid valve becomes the vital element to above system.In order to reduce leakage and aerodynamic force influence,a new type high-pressure solenoid valve was proposed.The simulation model which included electromagnetic model,aerodynamic force model was established by means of the nonlinear mathematic models.Using the software MATLAB/Simulink for simulation,the dynamic response characteristics of high-pressure pneumatic solenoid valve were obtained under different pulse width modulation(PWM)input control signals.Results show that,first of all,the new type of high-pressure solenoid valve can meet the switch requirement.Secondly,the opening movement and closing movement of the spool lags the PWM rising signal,and the coil current fluctuates significantly during the movement of the spool.Lastly,on/off status of high-pressure valve cannot be represented by the duty cycle.This research can be referred in the design of the high-pressure solenoid valve..

快速平面阀门静动水启门水力特性数值模拟研究

针对平板阀门的快速静水和动水启门过程,采用标准k-ε模型结合动网格技术,模拟阀门运动边界与动水流场交互耦合作用下的水动力与阀门负载特性,并将启门力结果与缩比模型试验进行对比分析,结果的趋势基本一致。在静水启门时,存在局部的压力梯度分布,但其对顺水流方向和垂直水流方向的水流力影响较小;在动水启门时,顺水流方向水流力初始值较大,之后随时间逐渐减小。

电磁驱动配气机构气门升程精度自动控制方法

为提升气门升程精度控制效果,提出电磁驱动配气机构气门升程精度自适应控制方法。首先,根据气门升程的控制需求,明确最大落座速度及气门运动的过渡时长,创建可变气门动力学模型;然后结合模糊PID控制器搭建气门升程精度的控制框架,调节扭矩信号的实际值和参考值间的误差;最后,通过对广义误差的不断迭代,输出最优迭代条件下的控制参数,实现电磁驱动配气机构气门升程精度的自适应控制。实验结果表明,所提方法的可变气门系统的负压损失值较低,并具有较好的自适应控制效果,可满足不同工况下的精度控制要求。

蓄热室焚烧炉关键装置优化设计

蓄热室焚烧炉包括燃烧室、蓄热小室和提升阀等。提升阀的密封性是影响设备连续稳定运行的关键因素。针对大尺寸提升阀进行优化设计,通过对阀板和定心装置的设计改进,使得提升阀的平整度及密封性得到改进。优化后的阀板具有密封效果好、易于加工装配率高、结构稳定、使用寿命长等优点。定心装置优化设计提高了阀杆与阀座的同轴率,且装配率高,易于更换,为提升阀的密封性提供保障。

轴流式止回阀与水击泄放阀组合的水锤防护系统研究

【目的】研究减小长距离高扬程输水工程中水锤作用对建筑物安全运行的不利影响,保障管道等建筑物安全。【方法】基于瞬变流理论及特征线法结合水柱分离数学模型的方法,并考虑水锤防护设备的边界条件,运用水锤仿真计算软件对系统停泵水锤进行数值计算。对传统的“单向调压塔+空气阀”和“水击泄放阀+轴流止回阀+空气阀”2种水锤防护措施进行比较,验证轴流止回阀与水击泄放阀组合的水锤防护系统防护效果。【结果】经过计算及后期实际工程多年运行验证后表明在长距离高扬程输水工程中:2种水锤防护方案对事故停泵下管线高压及负压水锤均有一定的防护效果。“单向调压塔+空气阀”的防护措施能使管道内负压由汽化负压-8.4 m降到了-6.9 m水头压力,管道正压最大值由3.04 Mpa降低至2.98 Mpa,但若要继续降低管线负压则需再增加调压塔数量,增加工程投资,经济性上并无优势;“水击泄放阀+轴流止回阀+空气阀”的水锤防护措施,能够有效防护因停泵引起的高低压水锤及水泵倒流倒转等问题,管道内负压由已汽化负压降到了-5 m水头压力,使其系统内最高压力由3.04 Mpa降低至3.0 Mpa,管道最大压力控制在稳态压力的1.2倍之内。【结论】工程竣工多年运行验证,此水锤防护系统只需在输水系统中设1处水击泄放阀和轴流止回阀即可实现有效的防护因停泵引起的高低压水锤及水泵倒流倒转等问题,具有相同的可靠性和更高的经济性,可为类似工程防水锤设计提供依据。

川渝地区含硫深井气举技术研究及应用

深层碳酸盐岩气藏占四川盆地天然气资源的59%,已开发气藏普遍受水侵影响,气藏具有埋藏深、高温、高压、含硫、井筒条件复杂等特点,导致气举技术在该类气藏中应用时面临设计方法缺失,工具性能不足等系列问题。针对上述问题,通过优化设计方法、研制高压气举阀及排水采气工具等技术攻关,并进行实际应用,形成了高压深井气举、免修井排水采气等一系列含硫深井排水采气新技术。研究成果表明:(1)在常规气举设计基础上,引入地层吸液指数,建立基于地层—井筒耦合流动的高压深井气举设计方法,该方法增加顶阀下入深度,气举阀布阀支数减少60%,降低阀间干扰;(2)通过气举阀结构优化设计,研制了充氮压力35 MPa、抗外压90 MPa的高压耐蚀气举阀,可满足6 000 m井深范围内酸化—气举联作和井下长期工作的需求;(3)设计以单向注入通道为核心的气举封隔器构建单向工艺通道,以自验封和悬挂为核心的气举封隔器重建工艺通道,研发了预置式、隔离式、跨隔式排水采气工具,满足永久式封隔器在气井完井不同阶段开展排水的技术需求,实现免修井排水采气。在川渝地区含硫深井中现场应用300余井次,应用井深超6 000 m,最大排水量达650 m~3/d,有效地解决了川渝地区气田含硫、高压、深井排水采气问题。

气井积液诊断及气举排液采气技术应用

气田在开发过程中不可避免会出现气井产液现象,当气井产量高于临界携液流量时,气体可将产出液携带出井筒,井底不产生积液,当气井产量低于临界携液流量时,由于液体滑脱导致井底产生积液。气举是日常排出井底积液的常用手段,在气田开发过程中起到非常重要的作用。判断井底是否积液是确定气井排液时机、选取气举井的基础,文章通过计算气井生产过程中的合理油套压差,绘制不同压力、不同产气量和产液量下的合理生产油套压差梯度图版,再将气井实际生产中的油套压差与合理油套压差进行对比,对井底是否积液进行准确判断,并通过气举排除井底积液,恢复气井产能。

升降式止回阀流体动态特性的影响因素研究

针对某核电机组的升降式止回阀流量小的问题,采用了计算流体动力学(CFD)方法模拟计算其开启动态过程,分析发生问题的本质原因。然后在此基础上,研究弹簧和阀瓣各设计参数对止回阀流体动态特性的影响。结果表明,阀瓣孔是影响升降式止回阀流体动态特性的最关键因素,孔径和孔数设计不合理是阀门开度小、流阻大的根本原因。最后给出了优化阀瓣孔设计参数建议。研究结论可为升降式止回阀流通性能优化设计提供科学依据和参考价值。

一种阀厅升降平台车平台载荷分布不均衡报警装置

针对阀厅升降平台车应用中出现的载荷分布不均衡问题,设计一种实时监测并报警的装置。首先,选择适用于载荷分布检测的压力、位移传感器。其次,对传感器采集的信号进行处理,实现对载荷分布的实时监测和分析。最后,设计声光报警以满足户外作业场景需求。实验验证表明,该装置能够有效监测载荷分布情况,并在出现异常时及时发出警报,有助于保障设备和操作人员安全。

Seal contact performance analysis of soft seals on high-pressure hydrogen charge valves

The charge valve is an important element in the charging port of a high-pressure hydrogen storage cylinder(HP-HSC).It is normally closed after the HP-HSC is filled with hydrogen.If the seal of the charge valve is damaged,it will seriously affect the stable operation of the hydrogen supply system and may even cause safety problems.Therefore,the seal performance of the charge valve is important.In this paper,finite element analysis(FEA)is carried out to analyze the seal contact performance of hydrogenated nitrile rubber(HNBR)gaskets in the seal pair of a charge valve.The effects of different pre-compressions,seal widths,and hydrogen pressures on the seal contact performance of the charge valve are analyzed.The contact pressure on the seal surface increases with the increase of pre-compression.With a pre-compression of 2.5 mm,the maximum contact pressure without and with hydrogen pressure are 68.51 and 107.38 MPa,respectively.A contact gap appears in the inner ring of the seal surface with pre-compression below 0.15 mm.The contact gap occurs between the entire seal surface with a seal width of1 mm.The contact pressure on the seal surface and the width of the separation area between the seal surfaces increase with the increase of the seal width.The contact gap between the seal surfaces is zero with a width of 2.5 mm.The width of the separation area between the seal surfaces decreases with the decrease of the hydrogen pressure.The width of the separation area is reduced from 0.5 mm at 35 MPa to 0.17 mm at 15 MPa.This work can be useful for improvement of the seal performance and of the design of the charge valve used in the HP-HSC.

变径气举柱塞变径过程受力分析与试验研究

为了满足海上气井复合管柱的变径结构要求,解决气井积液、延长气井生产寿命,设计了一种新型变径柱塞结构,分析了变径柱塞在扩径、碰撞缩径过程中的受力情况。模拟了柱塞排水采气工艺过程,开展了室内变径柱塞变径行为观测、举液量与进气压力测量、举液效率分析等试验。试验结果表明,变径柱塞可在变径管柱中顺利运行,扩径所需进气压力与举液量成正比,该变径密封结构具有良好的举液效率。研究结果可以为变径柱塞在海上气井的应用提供试验依据和理论参考。

水力式升船机组合阀流量比优化研究

景洪水力式升船机阀门段采用“并列三阀+矩形突扩体”的布置形式,目前组合阀流量分配暂无科学的指导依据。以景洪水力式升船机为依托,建立阀门段三维数值模型,研究组合阀不同流量比下的阀门段流场特性。结果表明,三阀联合运行时,突扩体内流场均匀度最佳;三阀联合运行时,主辅阀流量比为31时,流场内最低压力最高、最大流速最小、紊动较弱,最有利于抑制空化;组合阀合理流量比与流量系数比正相关,景洪工程组合阀较优的主辅阀流量比约为31。

煤矿掘进机液压系统的优化分析

通过分析煤矿掘进机液压系统的结构组成,了解负载敏感变量泵液压原理,达到提高掘进机液压系统运行稳定性,节省掘进机损耗的目的。通过仿真模型对液压升降回路及掘进机截割过程中压力波动情况进行模拟研究,优化后的变量泵可满足各种运行状态下液压系统的稳定运行效果,且运行过程中动力损耗显著降低。

多级降压调节阀流激振动监测方法研究

流场内流激振动是诱发调节阀流激共振和流致噪声的主要原因。以DN250多级降压调节阀为研究对象,采用Fluent软件对其流场流动特性进行数值模拟,得到典型开度下体积流量、流速、压力的分布规律。设计了循环式并联流量测试装置,对阀进行流量实验,验证了流量数值模拟的可靠性。采用监测流场漩涡脱落过程中横流会形成平均升力和监测流场湍流压力脉动的不同方法,得到流场流激振动的频谱信息。对两种监测方法机理研究,结果表明:监测升力系数是对整个流场涡脱过程产生的流激振动进行检测,适合监测小开度流场;监测压力脉动是对有限监测点的多种流激振动因素综合效果的监测,受监测点位置和数量的限制,适合中、高开度流场。

某长距离低扬程输水工程空气阀调压室与空气阀的联合水锤防护研究

针对长距离低扬程输水工程中单个空气阀的水锤控制距离较短无法有效抑制管内真空等问题,提出了空气阀调压室与空气阀联合防护的新型水锤控制方案,并以某长距离低扬程输水工程为例,对单纯采用空气阀防护以及空气阀调压室与空气阀的联合防护方案开展了水力过渡过程数值模拟与对比分析。结果表明,单纯采用空气阀防护时主管内发生了液柱分离,且因排气过快引发了较大的冲击水锤;而采用空气阀调压室与空气阀联合防护方案不仅能够有效抑制主管内的真空,还可有效缓解排气时引发的冲击水锤,是一种经济且有效的水锤防护措施,可为其他长距离低扬程输水工程的水锤防护提供借鉴。

掩护式液压支架升柱不同步原因分析与改进

针对掩护式液压支架升柱过程的不同步问题,在分析立柱升柱工况基础上,构建了立柱-液控单向阀升柱模型,基于阀芯受力平衡建立了立柱液控单向阀的阀芯开启量表达式,给出了立柱不同步的理论条件,并建立升柱系统的AMESim仿真模型,分析了立柱负载大小和液控单向阀阻尼孔直径对立柱同步的影响特性,给出了立柱不同步问题的改进方案,并用仿真与实验进行了验证。研究结果表明:造成两根立柱不同步的根本原因是两根立柱的负载不同,且负载相差越大,阀芯开启量相差也越大,不同步越明显;立柱液控单向阀主阀芯后腔阻尼孔直径对左右立柱的同步性能影响很小,且负载较大的立柱对应的液控单向阀阀芯开启时会出现一个冲击振动,阀芯会先开大然后再趋于较小的稳定值。

柴油机活塞与气门最小间隙仿真设计研究

柴油机的曲柄连杆机构和配气机构按照一定的节奏规律运转可以使柴油机连续、稳定的完成四个冲程的工作。本文以一款新研制的高速四冲程V型八缸柴油机为例,运用Creo和Adams软件对柴油机的活塞与气门的运动间隙进行仿真分析,绘制活塞行程曲线和气门升程曲线,获得活塞与气门最小轴向间隙。在实物样机组装过程中,使用配气相位检测系统对实物样机的活塞行程和气门升程进行检测,获得实物样机的活塞与气门最小轴向间隙。通过数据对比,模型仿真计算结果与实物样机检测结果基本一致,该结果满足柴油机基本运行要求。经过台架试验初步验证,样机运转平稳,整机性能达到预期设计要求。

EJM2×200掘锚一体机同步阀组的设计与应用

为了同时实现EJM2×200型掘锚一体机左右升降油缸同步工作和单独控制2种功能,设计了一种同步阀组,阐述了该同步阀组的设计、制造与应用情况。

Computational fluid dynamic(CFD)simulation of pilot operated intermittent gas lift valve

To design an efficient intermittent gas-lift installation,reliable information is needed in the performance of all process components,from the outer boundary of the reservoir to the surface separators.The gas lift valve is the one critical component that affects the design of the whole system.In intermittent producing system,the pilot gas-lift valve is extremely used to control the point of compressed gas entry into the production tubing and acts as a pressure regulator.A novel approach using computational fluid dynamics simulation was performed in this study to develop a dynamic model for the gas passage performance of a 1-in.,Nitrogen-charged,pilot gas-lift valve.Dynamic performance curves were obtained by using Methane as an injection gas with flow rates reaching up to 4.5 MMscf/day.This study investigates the effect of internal pressure,velocity and temperature distribution within the pilot valve that cannot be predicted in the experiments and mathematical models during the flow-performance studies.A general equation of the nonconstant discharge coefficient has been developed for 1-inch pilot valve to be used for further calculation in the industry without using CFD model.The developed model significantly reduces the complexity of the data required to calculate the discharge coefficient.