共查询到20条相似文献,搜索用时 156 毫秒
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采用调节阀阀瓣形线计算公式替代反复试验得到阀瓣形线的传统设计方法,设计了水力检修调节阀阀瓣形线,并标绘出流量曲线。该公式为特殊调节阀阀瓣形线设计提供了理论基础。 相似文献
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针对液化天然气用轴流式止回阀使用过程中可能发生的水锤问题,利用FLUENT动网格方法对两种不同型号(优化前、后)的阀门内部动态流场及阀瓣运动状态进行研究,分析优化前、后的阀门在相同工况下的动态特性。结果表明:止回阀关闭瞬间,优化后阀瓣受力相比优化前降低了70 N,优化后阀瓣运动速度相比优化前减小了0.674 m/s,这样阀瓣对阀座的冲击力相对更小,有利于保证阀座的使用寿命,同时有利于减小碰撞过程对管路系统的影响;FLUENT动网格方法能够预测止回阀关闭过程中“快关缓闭”的阀瓣运动特征,同时模拟得到的阀瓣运动状态以及止回阀内部动态流场特征,对轴流式止回阀的设计及选型具有重要的参考价值。 相似文献
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根据新型安全阀柔性阀瓣技术,对柔性阀瓣进行了数值模拟和试验研究,首次全面探讨了柔性阀瓣的性能,并与传统刚性阀瓣进行若干比较。通过对密封面接触压力进行数值分析发现,相同情况下,由于柔性阀瓣密封面最大接触压力总是大于刚性阀瓣,因此,柔性阀瓣具有更好的密封性能。试验测试表明,相同情况下,柔性阀瓣的整定压力一般低于刚性阀瓣;而且柔性阀瓣可以降低系统刚度,吸收冲击变形能,使系统抗冲击和抗疲劳能力提高,对保障系统稳定运行有利。 相似文献
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针对发明问题解决理论(TRIZ)方法与仿生学的优缺点,提出基于TRIZ与仿生学相结合的仿生创新设计方法.采用该方法,针对传统止回阀如球形止回阀、对夹式止回阀等流阻系数大的缺点,设计出一种新型的金字塔型多瓣止回阀,当流体正向流动时,阀瓣打开并位于流道侧面;当流体回流时,阀瓣关闭处于斜立状态,因此可以有效地减少阀瓣开关行程,并减小对流体的阻力与作用时间,降低了流阻系数.实验证明:该止回阀阀门的流通能力很强,能起到一定的节能作用. 相似文献
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首先介绍了微阻缓闭止回阀的结构及作用,进而对易损部件阀瓣密封面损坏问题进行了研究,提出了对易损件阀瓣修复改造方法。实践证明改造方案可行,经济效益明显。 相似文献
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截止阀阀瓣密封圈压装装置烟台市耐腐蚀泵厂赵忠奎,隋钧剑阀瓣上压装聚四氟乙烯密封圈的截止阀,密封圈的压装质量决定阀门密封的可靠性及使用寿命。根据需要,设计制造了密封圈压装装置,效果很好。密封因压装装置(图1)靠自身精度将阀瓣准确定位在装置底座中,压力施... 相似文献
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针对超超临界机组锅炉启动循环泵出口调节阀阀杆出现弯曲断裂的情况,分别从运行工况、阀门结构、执行机构等方面进行分析,得出超超临界锅炉启动循环泵出口调节阀阀杆弯曲由水锤现象造成。并给出解决措施,通过优化阀门结构与优化运行控制方式可解决阀杆弯曲故障问题。 相似文献
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在普通节流阀上用步进电机连接一个螺旋副机构 ,改进成为数字节流阀 ,并用PLC主控单元直接控制节流阀步进电机 ,满足了不同工况的节流调速要求 相似文献
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B. L. Salamandra 《Journal of Machinery Manufacture and Reliability》2020,49(1):75-79
This article examines the aspects of power in-process operations along automatic lines for filling and packaging liquid and half-liquid products. It is shown that individual power station actuators can be replaced with one group air hydraulic actuator without any loss in productivity. Moreover, the dynamics of cutting out ready-made items can be significantly improved. The layout of an air hydraulic cylinder is presented in which an additional introduced high-pressure sealed zone connected to the hydraulic chamber by means of an adjustable choke and a reverse valve allows changing the tool power stroke speed right to creeping. 相似文献
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为了解决V型球阀在相对较小开度下等百分比特性较差的问题,首次提出了一套对V型球阀阀芯的设计优化流程。该流程采用数值模拟、样本均值评估及面积平均等效法来计算DN50V型球阀阀芯等百比特性系数RQ,并用实验来验证流程的合理性,进一步推广到其他型号的球阀中。结果表明,原始DN50V型球阀阀芯在开度28.6%到7.1%区域不符合等百比特性,经优化设计后球阀阀芯的等百比特性系数RQ得到了有效改善,提升水平接近一倍多,并且通过试验测量所得等百比特性系数超出优化设计结果;进一步在DN80V型球阀阀芯中进行推广,可知这种优化设计方法具有普遍适用性;V型球阀阀芯设计优化方法效率高、数值可靠,能够提升阀芯流量控制水平,提高阀芯设计能力。 相似文献
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Passing the flow through a choke valve is one of the most important and valuable techniques in oil production. Liquid flow rate is an important factor to assess oil wells from an operational and economic point of view. There are some validated models that predict the flow rate of single phase fluid in a wellhead condition. However, the fluid is mostly multi-phase and lies in the critical condition when passing through the choke valve. A large number of scholars have made abortive attempts to develop a universal method to predict this flow rate. Based on the available empirical equations, the liquid rate depends on upstream pressure, gas-liquid ratio, and the bin size of the choke valve. To fill the current gap, this paper seeks to develop a model that can predict the multiphase flow behavior of choke valve in critical conditions by means of Radial Basis Function (RBF) neural network coupled with Genetic Algorithm (GA), as the optimizer. The model was developed using 221 training and 55 testing data points. The obtained results were then compared with the field data and, accordingly, the eligibility of the selected method was verified. Moreover, the dependency of input parameters on the liquid rate was evaluated using the Pearson and Spearman methods to show the effectiveness of each input parameter. While upstream pressure and gas-liquid ratio showed an inverse relationship, the choke bin size showed a direct relationship with the liquid rate. 相似文献
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One of the main components in oil and gas production system is choke valve. The choke valve role is maintaining sufficient back pressure to prevent water gas coning and formation damage and also stabilizing fluid flow to reach the optimum production scenario. Chokes can be employed either on surface or subsurface to control the fluid flow characteristics to the downstream processing facilities such as flow rate, pressure, and velocity. Malfunction of choke may results in severe damages in safety, facilities, and environment.In this study, a rigorous method based on artificial intelligence is developed to predict the choke flow coefficient for subsonic natural gas flow through nozzle and orifice type chokes. Reynolds number and ratio of choke diameter to pipe diameter was utilized as input parameters. The method used in this study is radial basis function neural network coupled with genetic algorithm. The results showed great agreement with experimental data. In addition, the proposed method was compared with classic correlations. This comparison demonstrated the robustness and superiority of the GA-RBF model. 相似文献