低压电缆紫外光交联辐照箱通风冷却研究

Study of Ventilation Cooling for an Irradiation Box of Low-voltage Cable Ultraviolet Cross-linking

为了解低压电缆紫外交联辐照箱内冷却空气速度、压力分布特点,建立该辐照箱三维实体模型.在一定假设条件和边界条件下,基于计算流体动力学(CFD)原理,对原始通风方案A和改进通风方案B进行内部湍流流场三维数值模拟.分析反射罩、分流板等结构变化对流场的影响,对比两种结构中电缆和高压汞灯的冷却情况.研究结果表明,采用集中气流先冷却电缆再冷却高压汞灯的改进结构,电缆周围空气流速提高,反射罩凹凸面间压差减少48%.通过增加紫外光汇聚光强和优化相应的通风结构可提高光交联生产效率,保证设备有效冷却.

In order to acquire the velocity and pressure distribution characteristics of the cooling air in the irra- diation box for low-voltage cable UV cross-linking, a 3D model of an irradiated box was established. Based on com- putational fluid dynamics （CFD） principle, the three dimensional turbulent flow fields for ventilation scheme A and improved ventilation scheme B was simulated by Finite Volume Method. Under some assumptions and boundary conditions, and the effect of the changes of reflector, shunt plates and other structure on the flow fields was ana- lyzed. The cooling condition of the cable and the high-pressure mercury lamps in the two structures was compared respectively. The results show that air velocity around the cable increased and pressure difference between two sides of the reflector was reduced by 48% by using the improved structure which centralized airflow cool the cable firstly and and tion then cool the high pressure mercury lamps. It can improve the efficiency of ultraviolet cross-linking production ensure the cooling effect for the equipment by increasing the intensity of ultraviolet light and optimizing ventila- structure.