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对东风７Ｄ型机车柴油机空气滤清系统进行了计算分析，通过对系统的试验研究和运用调查，说明该系统具有阻力小、纸质细滤器使用寿命长的优点，完全满足多雨雪。多隧道山区线路的使用要求。
The air filter system of DF7D locomotive diesel engine is calculated and analyzed. The system of experimental research and application survey shows that the system has the advantages of small resistance, long service life of fine paper filter, fully meet the rain and snow. Multi-tunnel mountain line requirements.