Damp atmosphere in explosion-proof enclosure of explosion-proof water-cooling frequency converter could lead to condensation during hot and cold variation, worse still, the condensed water may cause short circuit and destroy the converter. The condensation mechanism was qualitatively analyzed, and the relationship model was established about air temperature, air humidity and dew-point temperature, which was applied to determine whether there was condensation in the cavity. The correctness of the relationship model was verified by simulation test. The influence of flow and temperature of cooling water on condensation was analyzed, and a conclusion was gotten that the bigger difference between atmosphere temperature and dew-point temperature, the more serious condensation. It was pointed out that condensation in the explosion-proof enclosure can be controlled by means of cooling or heating.%针对隔爆型水冷变频器隔爆腔体内部的高湿度空气在冷热变化过程中会出现结露现象甚至产生冷凝水而导致电路短路的问题,对隔爆腔体内部结露机理进行了定性分析,提出了箱体内空气温度、空气湿度与露点温度的关系模型,并以此作为判断箱体内是否结露的依据;利用模拟试验方法验证了该关系模型的正确性,并分析了隔爆型水冷变频器的冷却水流量与温度对结露的影响情况,得出空气温度与露点温度的差值越大则结露越严重的结论,指出通过冷却或加热手段即可有效避免隔爆腔体内部出现结露现象.
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