采用全封闭正压风道设计,提高吸气效,消除噪音外漏,离心风机装在正后机箱下部,冷却器安装在机箱顶部,箱体内部布局采用计算机模拟流场分析优化设计。The design of fully enclosed positive pressure air duct is adopted to improve air suction efficiency and eliminate noise leakage. The centrifugal fan is installed in the lower rear part, and the cooler is installed on the top. The internal layout is analyzed and optimized by computer flow field simulating software.