Research on the Relationship between Operating Frequency and Efficiency of Mine Main Ventilators

This paper explores the relationship between the operating frequency and efficiency of mine main ventilation fans. By analyzing the overall structural design of the ventilation fan, the principle of variable frequency speed regulation, and the operating frequency characteristics, the air volume efficiency curve of the variable frequency fan at different blade angles and frequencies is studied by using the experimental data fitting method. The results indicate that the efficiency curves of the same blade angle at different frequencies have similarity, and the highest efficiency point shows an increasing trend with the increase of operating frequency. In the application case of Xiadian Coal Mine, through frequency conversion regulation, the efficiency of the fan increased from 69.45% to 70.72%, verifying the effectiveness of frequency conversion technology in improving the efficiency of the mine ventilation system.