隔爆水冷变频器箱体内温度场分析

Internal temperature of flameproof water-cooling inverter

建立了某隔爆水冷变频器数学模型,分析不同过流截面、供水流量和温度对箱体内部温度场的影响,重点分析铜基板与空气接触面随供水流量和温度变化结露区域。在供水流量为24 L/min,矩形过流截面的结露区域比正方形过流截面的结露小且箱体内部温度与水温呈线性关系。当温度289 K时,随着供水流量增大,结露的区域增大,应提高供水温度。根据仿真结果,建立冷却水流速、水温与箱体内最高温度的关系式,得到避免出现结露现象最优点。

A mathematical model of flameproof water-cooling inverter was established. The author analysis different flow section, flow and temperature affecting on the internal temperature field, and focused on condensation area of contact surface when flow and temperature was changing. When the water flow was 24 L/min, condensation area of rectangular flow section was smaller than square flow section and internal box temperature and water temperature was linear. When temperature was 289 K, along with the increase of water flow, the condensation area increased and the temperature of supply water should be raised. According to the simulation results, The relation of the flow velocity, water temperature and the highest temperature of the converter was established. Optimal flow velocity and optimal temperature which can avoid condensation phenomenon are obtained.