我国很多工厂采用小风口和热风炉胆强化冲天炉熔炼。由于风口较小,风机管网损失显著增加,多数工厂原用的8-18高压离心通风机,它的风压不能达到要求,有时要几台串联使用。近年来不少工厂被迫使用罗茨鼓风机,它虽能满足风量风压要求,但这种风机不仅结构复杂、制造困难、造价高,而 Many factories in our country adopt small tuyere and hot blast furnace to strengthen Cupola smelting. As the outlet is smaller, the fan pipe network losses increased significantly, most of the original factory use 8-18 high pressure centrifugal fan, it can not meet the wind pressure requirements, and sometimes to use several in series. In recent years, many factories are forced to use Roots blower, although it can meet the wind pressure requirements, but this fan is not only complicated structure, manufacturing difficulties, high cost, and