动态流量平衡阀小口径流量精度修订及阀芯振动抑制研究

发布时间：2018-06-05 22:24

本文选题：动态流量平衡阀 + 数值模拟　；参考：《兰州理工大学》2017年硕士论文

【摘要】：水力平衡和压力平衡作为区域供暖系统、建筑给排水系统、暖通空调等系统中的关键问题,对系统的稳定性起着至关重要的作用,而动态流量平衡阀性能的优劣更是直接影响到系统水力平衡的稳定性和节能性,由于国内平衡阀中高端市场基本上都是国外产品充斥,国内现有产品存在流量精度不达标,阀芯振动严重等问题,本文以我校与浙江盾安阀门有限公司联合研发的动态流量平衡阀小口径产品为研究对象,针对研发过程中出现的流量精度不能满足标准要求,阀芯振动等问题,开展了以下研究工作:(1)分析了动态流量平衡阀的工作原理,建立了平衡阀阀芯可变开孔型线设计数学模型,提出采用平均液动力修正法和压差补偿系数因子修正法对现有的型线公式进行了优化修正,得到了修订后的阀芯开孔型线公式。(2)建立了优化型线后典型参数的动态流量平衡阀三维流道模型,基于阀芯运动的动力学模型,编写CEL语言监测阀芯各端面受力信息,运用ANSYS CFX软件对其进行数值模拟,研究了优化型线后平衡阀的流量控制精度和流量精度误差,探讨了平衡阀工作过程中阀芯端面和侧面所受液动力和面平均压强的变化规律。(3)利用合作单位改造后的试验条件,对阀芯型线优化前后的平衡阀进行样机产品试验研究,同时结合数值模拟的结果,分析了试验值和模拟值之间流量控制精度、流量误差的变化规律,研究了弹簧刚度、阀芯壳体结构、阀芯组件表面粗糙度等关键因素对平衡阀流量精度的影响。(4)建立了阀芯振动力学模型,采用流固耦合模态分析方法,研究了4种优化改进方案对平衡阀阀芯振动抑制的影响规律,分析了提高动态流量平衡阀稳定性的改进措施。通过上述优化及分析研究,小口径平衡阀流量控制精度已超过工业标准的要求,振动现象已明显降低,阀芯稳定性得到提高。本文的研究对动态流量平衡阀阀芯可变开孔型线的优化设计、优化方法的运用、结构的改进、稳定性能的改善具有一定的指导意义。
[Abstract]:Hydraulic balance and pressure balance are the key problems in district heating system, building water supply and drainage system, HVAC system and so on, which play an important role in the stability of the system. The performance of the dynamic flow balancing valve directly affects the stability and energy saving of the hydraulic balance of the system. Because the high-end market of the domestic balance valve is basically full of foreign products, the domestic existing products have the flow accuracy not up to the standard. The vibration of valve core is serious and so on. This paper takes the small caliber product of dynamic flow balance valve developed jointly by our school and Zhejiang Dun'an Valve Co., Ltd as the research object, aiming at the flow precision that appears in the course of research and development can not meet the standard requirement. This paper analyzes the working principle of the dynamic flow balancing valve, and establishes a mathematical model for the design of the variable opening profile of the valve core. The average hydrodynamic correction method and the pressure difference compensation coefficient factor correction method are proposed to optimize the existing profile formulas. The revised formula of orifice profile of the valve core is obtained. (2) the three-dimensional flow channel model of the dynamic flow balance valve with typical parameters after the optimized profile is established. Based on the dynamic model of the movement of the valve core, the CEL language is compiled to monitor the stress information of the end face of the valve core. The flow control accuracy and the flow precision error of the balance valve after the optimized profile line are studied by using the numerical simulation of ANSYS CFX software. In this paper, the variation law of the hydraulic force and the average pressure on the end and side of the valve core during the working process of the balance valve is discussed. By using the experimental conditions after the transformation of the cooperative unit, the prototype product of the balance valve before and after the optimization of the valve core profile is studied. At the same time, combined with the results of numerical simulation, the variation of flow control precision and flow error between the test value and the simulated value is analyzed, and the spring stiffness and the structure of the valve core shell are studied. The influence of some key factors such as surface roughness of spool assembly on the flow accuracy of the balance valve. (4) the dynamic model of the valve core vibration is established, and the fluid-solid coupling modal analysis method is adopted. The influence of four optimization methods on the vibration suppression of the valve core is studied, and the improvement measures to improve the stability of the dynamic flow balance valve are analyzed. Through the above optimization and analysis, the flow control accuracy of the small caliber balance valve has exceeded the requirement of industrial standard, the vibration phenomenon has been obviously reduced, and the stability of the valve core has been improved. The research in this paper has certain guiding significance for the optimization design of the valve core variable opening profile, the application of the optimization method, the improvement of the structure and the improvement of the stability performance of the dynamic flow balance valve.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH134

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