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为了获得高质量的薄膜,需对流延膜的冷却机理、流延辊的工作原理、流延辊内部流道结构等进行研究。对现有单向螺旋流动式流延辊内部冷却水流动情况进行了仿真研究,发现在现有结构条件下流延辊内部有多个影响流动的旋涡区,特别是在流延辊出水腔处有一较大环流流动,严重影响了冷却水快速流动。为了降低流延辊流动阻力,首先提出在出水腔添加导流叶片的初始优化方案,结果表明,在出水腔添加导流叶片的优化方式可有效改善现有流延辊的送水能力;随后对导流叶片进一步优化,采用“扇形”结构的导流叶片,使得优化结果更好。最后“扇形”导流片的优化方案相比于原有结构,其进出口总压损失降低了6.1%,每小时送水量增加了66.3 t。
In order to obtain high-quality film, the cooling mechanism of cast film, the working principle of casting roll and the structure of the inner flow channel in casting roll should be studied. In the existing one-way spiral flow casting roller internal cooling water flow conditions were simulated and found that under the existing structure of the casting roller within a plurality of influencing the flow of the swirl zone, especially in the casting roller outlet cavity has a Large circulation flow, seriously affected the rapid flow of cooling water. In order to reduce the flow resistance of the casting roll, the initial optimization scheme of adding the guide vane in the water outlet chamber is proposed. The results show that the optimized method of adding the guide vane in the water outlet chamber can effectively improve the water delivery capacity of the existing casting roll. Flow leaves further optimization, the use of “fan ” structure of the guide vane, making the optimization results better. Finally, the “fan-shaped” baffle optimization scheme reduces the total pressure loss at import and export by 6.1% compared with the original structure, and increases the water delivery volume by 66.3t per hour.