共查询到19条相似文献,搜索用时 78 毫秒
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一种新型的电液比例流量控制阀郭瑜太原矿山机器厂润滑液压研究所,030009山西太原1前言流量控制阀是用来控制液压系统中的流量,以便控制液压缸、液压马达的运动速度。电液比例流量阀使阀的输出流量正比于输入电信号,从而可连续比例地控制液压缸或马达的速度... 相似文献
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王悦 《工业仪表与自动化装置》2012,(6):6-9
设计了一种具有机械结构简单、通流能力强、流量控制精度高的大口径自力式流量平衡阀模型,采用标准k-ε湍流模型和SIMPLE算法对模型在不同阀芯位移下的流动特性进行了数值模拟,且搭建高精度动态流量平衡阀流量压差特性实验平台对设计的恒流量平衡阀实物模型进行了实验研究,结果表明该平衡阀具有低能耗和精度高的特点。 相似文献
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长行程升降平台,采用多级液压缸,为确保升降速度均匀,设计了恒功率流量控制阀来实现系统的要求. 相似文献
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介绍一种具有两个腔体的新型IC卡燃气表流量控制阀。它的减速机构输出轴上用储油槽与密封件配合进行气隔离。这种控制阀具有转矩大,工作可靠,响应时间短等特点。 相似文献
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阐述了一种新型智能流量控制阀的设计方法、数值计算和实验验证过程.利用加权面积方法设计了配流板的通流面积,并用数值模拟的方法,计算和分析了阀内流体的压力、速度场的分布以及阀门阻力系数的变化.最后搭建实验平台,验证了阀门的流量特性.结果表明加权面积法适用于新型智能流量控制阀的设计. 相似文献
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针对现有的高空作业车控制阀在泵欠流量状态下不能很好地进行复合动作的问题,提出了一种新的由螺纹插装阀组成的集成阀,并应用AMESim进行仿真分析.仿真结果表明,经改进后的控制阀块在泵欠流量状态下依然能够很好地进行与负载无关的流量分配,保证了复合动作的协调性. 相似文献
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在石油开采过程中,由于底水锥进、储层非均质性等原因会出现油层出水现象,这会导致产油量递减加快,于是不断有新技术被应用到油井完井之中,以达到延缓水突破和控水增油的目的。为此,文中研发了一种基于流量控制阀的控水技术,该结构可根据流体黏度大小自动控制阀体过流量,限制低黏度流体的通过性,在一定程度上起到了控水的作用。借助CFD软件对该项技术进行深入研究,并通过对流场特性分析,剖析了其工作原理及工作特性,该技术经渤海油田现场应用验证,取得了显著的控水增油效果,为控水生产的相关工具开发提供了理论依据及技术支撑。 相似文献
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以汽轮机调节阀为研究对象 ,通过在阀座喉部、阀瓣头部等阀体内各关键部位设置测点 ,利用微小型高频动态压力传感器及其采集系统 ,进行多种工况和多个方位的试验研究 ,对流场动态压力信号进行采集、处理和分析 ,探讨由于阀内气体流动引发的阀门工作的稳定性 相似文献
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电站汽轮机调节阀振动试验研究 总被引:2,自引:0,他引:2
针对电站汽轮机常用调节阀的不稳定和振动工况进行试验研究,利用微小型高频动态压力传感器等先进测试仪器,测量阀门内部流场,尤其是阀座喉部、阀瓣头部等关键部位,获得阀门流体诱发振动结论。在大压比、大升程条件下,喉部各测点的脉动压力不大,流动稳定。中小压比、中小升程时,压力脉动达到相对的最大值或变化最大,此时气流对阀瓣的作用力也达到最大。气流脉动一般含有小于几百Hz的主频,所以这种条件下气流与结构相对容易发生共振。 相似文献
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Flow control valves typically use mechanical pressure drop compensator or dynamic flow meter to lessen the impact of pressure drop on outlet flow. However, there are some disadvantages, such as complex mechanical structure and small flow capacity. In this paper, a kind of digital flow compensator with bilinear interpolation algorithm is presented to compensate the pressure drop, in which the pressure drop and the desired outlet flow are the two input parameters. A two-stage proportional flow control valve with the proposed compensator is investigated. Pressure drop across the metering orifice of the valve is measured and fed back to the proposed compensator. If the detected pressure drop has deviated from the threshold, then the compensator will generate a compensation signal to adjust the poppet opening of the valve, which ensures that the output flow is independent of the pressure drop. Performances of the valve with the proposed compensator are investigated by simulation and experiment. Results show that it has a reasonable static control characteristics. In addition, there is no dead-zone in its steady flow curve; pressure drop have little impact on its output flow. Its dynamics will be affected by pressure drop and input voltage. Increasing pressure drop can improve system dynamics under constant input signal conditions. On the other hand, increasing input signal can shorten the poppet's closing time, but it will result in the longer opening time and the greater overshoot in the opening stage. 相似文献
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In this study, a throttling venturi valve with adjustable area was designed to control the thrust of a monopropellant thruster using hydrogen peroxide. The flow rate control characteristics of the throttling venturi valve were investigated based on the pintle stroke and upstream pressure of the venturi. Three kinds of experiments were conducted: pressure and flow rate measurement according to pintle stroke and venturi upstream pressure, determination of critical pressure ratios under various conditions, flow rate control performance through open-loop control and feedback control of an actuator. The pressures were measured at the upstream, throat, and downstream of the venturi. It was observed that the flow rate changed in proportion to the stroke and upstream pressure. Below a stroke of 10 mm, the critical pressure ratio gradually decreased as the stroke and upstream decreased. However, above a stroke of 10 mm, the critical pressure ratio converged to a value between 0.7 and 0.8 regardless of the upstream pressure. The results of automatic flow rate control tests using open-loop control and feedback control showed that the measured flow rate satisfactorily followed the target flow rate profile. 相似文献
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节流阀必须有足够的行程,才能达到节流介质的目的。波纹管节流阀除具有一般节流阀的特性之外,还具有其独特行程要求,本文重点介绍了如何在有限的安装空间下,增加其行程,在到充分节流的目的。 相似文献
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介绍了梭控球阀在输送管道中的作用和工作原理。阐述了差流可调梭阀的特点及可以控制球阀、蝶阀、闸阀和其他阀类的气动(液压)驱动装置的性能。通过对试验结果的研究分析,证明梭控球阀可以防止液体输送管产生水击,实验管道保护,减缓气体输送管压力突然升高,有利稳定流动。 相似文献