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义马矿务局跃进煤矿西风井两台70B_2—21型No.24扇风机,一九七五年八月安装结束,同期投入运行.由于矿井初期所需风量较小,负压较低,当时决定摘除一级风叶采用单级20°运行.随着生产的发展,矿井的内阻相应增加,所需风量也要加大.根据这一情况,一九八二年七月中旬,又将1~#风机恢复为双级20°运行,实测风量为63.5米~3/秒.在此状况下运行,风量虽能满足要求,但风机是在低效区运行,效率甚低.
Yima Mining Bureau Yuejin Coal Mine Xifeng two No. 70B_2-21 No.24 fans, installation was completed in August 1975, put into operation in the same period .Because of the small amount of air required by the mine early, lower negative pressure, then Decided to remove the first stage blades with a single-stage operation of 20 ° With the development of production, the corresponding increase in the internal resistance of the mine, also need to increase the air volume .According to this situation, in mid-July 1982, 1 ~ # fan is restored to two-stage 20 ° operation, the actual measured air volume is 63.5 m ~ 3 / s In this condition, the air volume can meet the requirements, but the fan is operating in the low efficiency area, the efficiency is very low.