本文選題：動(dòng)態(tài)流量平衡閥 + 數(shù)值模擬　； 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：水力平衡和壓力平衡作為區(qū)域供暖系統(tǒng)、建筑給排水系統(tǒng)、暖通空調(diào)等系統(tǒng)中的關(guān)鍵問(wèn)題,對(duì)系統(tǒng)的穩(wěn)定性起著至關(guān)重要的作用,而動(dòng)態(tài)流量平衡閥性能的優(yōu)劣更是直接影響到系統(tǒng)水力平衡的穩(wěn)定性和節(jié)能性,由于國(guó)內(nèi)平衡閥中高端市場(chǎng)基本上都是國(guó)外產(chǎn)品充斥,國(guó)內(nèi)現(xiàn)有產(chǎn)品存在流量精度不達(dá)標(biāo),閥芯振動(dòng)嚴(yán)重等問(wèn)題,本文以我校與浙江盾安閥門有限公司聯(lián)合研發(fā)的動(dòng)態(tài)流量平衡閥小口徑產(chǎn)品為研究對(duì)象,針對(duì)研發(fā)過(guò)程中出現(xiàn)的流量精度不能滿足標(biāo)準(zhǔn)要求,閥芯振動(dòng)等問(wèn)題,開展了以下研究工作:(1)分析了動(dòng)態(tài)流量平衡閥的工作原理,建立了平衡閥閥芯可變開孔型線設(shè)計(jì)數(shù)學(xué)模型,提出采用平均液動(dòng)力修正法和壓差補(bǔ)償系數(shù)因子修正法對(duì)現(xiàn)有的型線公式進(jìn)行了優(yōu)化修正,得到了修訂后的閥芯開孔型線公式。(2)建立了優(yōu)化型線后典型參數(shù)的動(dòng)態(tài)流量平衡閥三維流道模型,基于閥芯運(yùn)動(dòng)的動(dòng)力學(xué)模型,編寫CEL語(yǔ)言監(jiān)測(cè)閥芯各端面受力信息,運(yùn)用ANSYS CFX軟件對(duì)其進(jìn)行數(shù)值模擬,研究了優(yōu)化型線后平衡閥的流量控制精度和流量精度誤差,探討了平衡閥工作過(guò)程中閥芯端面和側(cè)面所受液動(dòng)力和面平均壓強(qiáng)的變化規(guī)律。(3)利用合作單位改造后的試驗(yàn)條件,對(duì)閥芯型線優(yōu)化前后的平衡閥進(jìn)行樣機(jī)產(chǎn)品試驗(yàn)研究,同時(shí)結(jié)合數(shù)值模擬的結(jié)果,分析了試驗(yàn)值和模擬值之間流量控制精度、流量誤差的變化規(guī)律,研究了彈簧剛度、閥芯殼體結(jié)構(gòu)、閥芯組件表面粗糙度等關(guān)鍵因素對(duì)平衡閥流量精度的影響。(4)建立了閥芯振動(dòng)力學(xué)模型,采用流固耦合模態(tài)分析方法,研究了4種優(yōu)化改進(jìn)方案對(duì)平衡閥閥芯振動(dòng)抑制的影響規(guī)律,分析了提高動(dòng)態(tài)流量平衡閥穩(wěn)定性的改進(jìn)措施。通過(guò)上述優(yōu)化及分析研究,小口徑平衡閥流量控制精度已超過(guò)工業(yè)標(biāo)準(zhǔn)的要求,振動(dòng)現(xiàn)象已明顯降低,閥芯穩(wěn)定性得到提高。本文的研究對(duì)動(dòng)態(tài)流量平衡閥閥芯可變開孔型線的優(yōu)化設(shè)計(jì)、優(yōu)化方法的運(yùn)用、結(jié)構(gòu)的改進(jìn)、穩(wěn)定性能的改善具有一定的指導(dǎo)意義。
[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.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH134

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