冲压泵与铸造泵效率技术指标的对比分析与研究

发布时间：2018-05-08 21:28

本文选题：冲压泵 + 铸造泵　；参考：《浙江工业大学》2011年硕士论文

【摘要】：冲压焊接离心泵流道表面光滑、清洁环保、制造过程省时省材、水力性能优于铸造泵而且使用寿命长,维修替换方便等等优点繁多,已经成为未来泵发展的主方向。冲压泵的效率技术指标往往高于国家标准而铸造泵的效率技术指标往往低于国家标准,为此,本文选取DQ100-64-22型冲压泵为研究对象,利用CFD数值模拟的方法开展了冲压泵与铸造泵效率技术指标的相关对比研究,同时对于部分结构的方案与扬程效率之间的关系,进行了理论分析与试验研究。本文的主要工作和成果如下： 1.通过查阅大量的资料,详细介绍了国内外在冲压泵设计理论、设计方法上的研究成果；比较了冲压泵和铸造泵的设计方法及制造工艺；并对冲压泵与铸造泵进行结构对比,分析得在叶型、叶片厚度、口环间隙和叶轮粗糙度等结构存在较大差异。 2.应用Pro/E软件建立DQ100-64-22型多级冲压泵单级水力模型,利用Gambit画流体域网格,定义边界条件,然后倒入到Fluent模拟计算,分析内流场的静压、速度、总压等参数,再用后处理方法通过计算得到扬程效率等外特性参数。 3.对直叶片、倒角边叶片、空间叶片倾斜等三种叶型模拟分析内流场和扬程效率。得到,叶片倒角和倾斜对于泵的影响较小；直叶片对内流场和水力性能影响较大,但在小流量时影响很小。说明直叶片叶型适用于低比转速；冲压泵与铸造泵受叶型影响较小。 4.研究不同叶片厚度d模型的模拟结果。得到,在d=2mm时内流场流态和性能变化微小；在铸造泵范围d=3mm时,内流场和性能受影响较大。比较冲压泵叶片厚度d=1mm与铸造泵叶片厚度d-3mm,扬程效率提高百分比分别为2.85%、3.34%。 5.分析口环间隙与扬程效率关系。结果表明,口环间隙对泵腔的静压力和流动速度都有一定影响；冲压泵的口环间隙为零,铸造泵为0.25mm,比较它们在设计工况下的扬程效率,冲压泵提高百分比分别为5.16%、2.25%。 6.通过改变Fluent里的设置项粗糙高度,研究叶轮内流道粗糙度对泵性能的影响。结果表明,粗糙度对扬程效率影响比较显著,而对内流场变化影响不大。受粗糙度影响,冲压泵比铸造泵扬程效率提高的百分点分别为2.22%和2.86%。 7.与企业合作制造样机,并在企业的试验平台上对部分方案进行试验研究。结果显示试验数据中扬程普遍比模拟结果略高而效率比模拟结果稍低,但变化趋势与模拟结果一致,证明模拟结果的可靠性。本文对比研究冲压泵和铸造泵的成果只是阶段性的,在此基础上还需进一步深入研究,为离心泵的发展应用提供坚实的理论和实践基础。
[Abstract]:Stamping and welding centrifugal pump has many advantages such as smooth surface, clean and environmental protection, saving time and material in manufacturing process, better hydraulic performance than casting pump, long service life, convenient maintenance and replacement, etc., which has become the main direction of pump development in the future. The efficiency technical index of punching pump is often higher than that of national standard, and the efficiency technical index of casting pump is often lower than that of national standard. Therefore, this paper selects DQ100-64-22 type punching pump as the research object. A comparative study on the efficiency of punching pump and casting pump was carried out by means of CFD numerical simulation, and the relationship between the scheme of some structures and the efficiency of head was analyzed theoretically and experimentally. The main work and results of this paper are as follows: 1. Through consulting a lot of data, the paper introduces in detail the research results of stamping pump design theory and design method at home and abroad, compares the design method and manufacturing technology of punching pump and casting pump, and compares the structure of punching pump and casting pump. It is found that there are great differences in the structure of blade shape, blade thickness, mouth ring clearance and impeller roughness. 2. The single stage hydraulic model of DQ100-64-22 multistage punching pump is established by using Pro/E software. The boundary conditions are defined by using Gambit to draw the fluid grid, and then the static pressure, velocity and total pressure of the internal flow field are analyzed by Fluent simulation. The external characteristic parameters such as lift efficiency are obtained by post-processing method. 3. The internal flow field and lift efficiency are simulated and analyzed for three kinds of blade types, I. e., straight blade, chamfer blade and spatial blade tilting. The results show that the chamfering and tilting of the blade have little effect on the pump, and the straight blade has a great influence on the internal flow field and hydraulic performance, but it has little effect on the small flow rate. The results show that the blade shape of straight vane is suitable for low specific speed, and the impeller and casting pump are less affected by blade mold. 4. The simulation results of d model with different blade thickness were studied. It is found that the flow pattern and performance of the inner flow field change slightly at d=2mm, and that the flow field and performance are greatly affected when the casting pump is in the range of d=3mm. Comparing the thickness of stamping pump blade d=1mm with casting pump blade thickness d-3 mm, the percentage of lift efficiency improvement is 2.85% and 3.34 mm respectively. 5. The relationship between gap and lift efficiency is analyzed. The results show that the gap of orifice ring has a certain influence on the static pressure and velocity of the pump cavity, and the clearance of the punching pump is zero and the casting pump is 0.25 mm. Compared with their lift efficiency under the design conditions, the ramjet pump increases by 5.16% and 2.25% respectively. 6. The influence of impeller flow channel roughness on pump performance was studied by changing the rough height of the set term in Fluent. The results show that the roughness has a significant effect on the lift efficiency, but has little effect on the internal flow field. Under the influence of roughness, the efficiency of the head of the punching pump is increased by 2.22% and 2.86% than that of the casting pump, respectively. 7. Cooperate with the enterprise to manufacture the prototype, and carry on the test research on the test platform of the enterprise. The results show that the head of the test data is generally higher than the simulation results and the efficiency is slightly lower than that of the simulation results, but the variation trend is consistent with the simulation results, which proves the reliability of the simulation results. In this paper, the results of comparative study on punching pump and casting pump are only phased, and on this basis, it is necessary to further study, to provide a solid theoretical and practical basis for the development and application of centrifugal pump.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311

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