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国内过去矿井通风大多采用BY型及70B_2型轴流式通风机,这种风机是仿苏40年代产品,效率低、结构落后、噪声大、返风量达不到规程要求、性能不理想,一般实际运行效率在50～60％,浪费电能十分可观。我局平均每台风机每年多耗电30万度,折合2.4万元。为使用高效新风机,我局曾于1959年安装了沈阳鼓风机厂试制的K—06型风机,效率有所提高,最高静压效率达78％。至1977年以后,对使用的风机进行了局部改造,在BY型及70B_2型风机上使用机翼形扭曲叶片代替原梯形叶
In the past, domestic mine ventilation mostly adopted BY-type and 70B-2 axial-flow fans, which were imitations of the Soviet Union in the 1940s. The efficiency was low, the structure was backward, the noise was large, the amount of return air failed to meet the requirements, the performance was not satisfactory, Operating efficiency of 50 ~ 60%, a waste of electricity is very impressive. My bureau averaging more than 300,000 degrees per fan every year, equivalent to 24,000 yuan. In order to use the new fan with high efficiency, our bureau installed the prototype K-06 fan prototype manufactured by Shenyang Blower Factory in 1959, with an increase in efficiency and a maximum static pressure efficiency of 78%. After 1977, some modifications were made to the fans used, using wing-shaped twisted blades instead of the original trapezoidal blades on the BY and 70B_2 fans