针对矿井老型号轴流式扇风机的结构缺陷，结合现场实际进行了技术改造，提高了主扇运动效率，收到了显著的经济效益。

This is directed against structure defect of mine old type tube - axial fan, make technique transform to combine practice, raises main fan running efficiency, receives notable economic benefits.

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简要论述局部扇风机（轴流式通风机）产生不稳定工况的原因和变化规律，提出以分流器消除风机特性曲线驼峰区段、使其工作运行稳定的技术措施。

The technical measures are given out by which the hump zone of characteristic curve of the local fan can be eliminated using a current divider and the operaiting stability of the fan can be improved.

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建井期间未构成全风压通风系统时，通常采用局扇供风，往往造成瓦斯积聚，为此选用轴流式大功率局部扇风机供风，是解决长距离通风的最佳选择。

When auxiliary fan without enough pressure used in shaft construction, it was possible to lead gas concentration. The powerful axial flow auxiliary fan may solve the problem.

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