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70B_2(或BY)类型风机是我国五十年代仿制的矿山主要通风设备,各矿山沿用至今。 目前该机型已显得技术陈旧,不能满足矿山生产对新型合理、节能风机的要求。 70B_2类风机由于风叶设计不合理,造成工作时风叶顶部和根部上下压差很大,顶部风压较大,根部风压小,使顶部产生径向风流,形成较大的风阻,影响了风流的轴向速度。这就使排风效果和风机效率明显降低,
70B_2 (or BY) type fan is China’s fifties imitation mine main ventilation equipment, the mine still in use. At present, the model has become obsolete technology, can not meet the requirements of a new type of reasonable, energy-saving fan of mine production. 70B_2 class fan due to unreasonable fan blade design, resulting in the work of the top and bottom of the fan blade pressure difference is large, the top of the wind pressure is greater, the root of wind pressure is small, so that the top of the radial wind flow, the formation of greater wind resistance, affecting the Merry-flow axial velocity. This makes the exhaust effect and fan efficiency is significantly reduced,