凹印机换热器结构性能的优化

Optimization of Structural Performance of Heat Exchanger of Gravure Printing Machine

目的大幅度优化凹印机的工作性能,为干燥箱提供持续稳定的热源。方法依据流体力学与传热学理论对换热器进行仿真分析,研究翅片管换热器的换热效率与翅片高度、翅片间距、换热管排列方式的映射关系。结果换热器的换热效率随翅片间距的增加而减少,选择3 mm间距时效果较优,较低的翅片高度使换热器结构更加紧凑;在正三角形、转角正三角形、正方形、转角正方形排列方式中,正三角形排列方式出口温度均匀且换热效率最高。结论选取凹印机换热器的结构时尽量选择翅片间距小、翅片高度低、正三角形排列的换热器,为企业选用最优性能的换热器提供理论依据。

The work aims to substantially optimize the working performance of the gravure printing machine, so as to provide sustainable and stable heat source for the drying box. The simulation analysis of heat exchanger was carried out according to the theory of fluid mechanics and heat transfer. The mapping relation between the heat exchange efficiency of finned tube＇s heat exchanger and the fin height, fin spacing and heat exchange tube arrangement was studied. The heat transfer efficiency decreased with the increase of fin spacing and 3 mm was a better spacing than others. The lower fin height made the heat exchanger more compact. Among the arrangement of equilateral triangle, corner equilateral triangle, square and corner square, the outlet temperature of equilateral triangle arrangement was unifbrm and its heat transfer effi- ciency was the highest. As for the selection of structural performances of heat exchanger of the gravure printing machine, the heat exchanger with small fin spacing, low fin height and in equilateral triangle arrangement should be preferably se- lected. It provides a theoretical basis for the heat exchanger with the optimal performance to be used by the enterprises.