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The mechanical shifting of the axial fan is a mechanical method to change the speed of the conveying fluid equipment, specifically the triangular belt shifting, the gear reducer, the toothed chain type continuously variable transmission, the multi-disc continuously variable transmission and the fluid coupling, etc., according to the fluid The equipment's working system, working environment, speed range, load characteristics and motor power are selected. The most common is the use of a fluid coupling, which is a hydraulic machine that connects and transmits power through fluid kinetic energy. The main components are relatively mounted concentric but different shaft pumps and turbines.

When the driving pump wheel rotates, the internal working oil flows under the centrifugal force along the inner edge of the pump wheel, and the axial flow fan passes through the gap between the two wheels (working cavity) and then flows from the outer edge of the turbine to the center. The impact turbine rotates it and the output shaft and then back into the pump wheel. This cycle. The adjustment of the output shaft speed is generally controlled by the spoon tube. Or use the regulating valve to control the oil inlet, or both, to achieve the most change in the oil filling of the coupling working chamber.

The main type of this type of coupling is variable charge type. The domestic production of fire-fighting exhaust fan and the most used ones are the scoop tube interception type and the rotary oil-fill type. The former is a large and medium-sized device, which is suitable for transmission. Medium power, the latter is a small device. The hydraulic coupling speed adjustment has the following advantages: even if the flywheel inertia is large, the motor can start under the condition of near no-load, and reducing the starting time of the exhaust fan can reliably prevent the motor from being overloaded; the fan manufacturer can absorb the impact and torsional vibration, Smooth operation, can significantly extend the life of the entire system; maintenance is simple; can achieve stepless speed regulation, if the speed range is in non-constant pressure system such as dust removal fan, reach... 2-0-985, in constant pressure system (such as boiler feed water pump) up to ... 3-0-985; transmission efficiency varies with working conditions, rated condition 0.96-0-985, can simplify the fluid system, high control accuracy.

It is easy to realize remote control; the higher the driving speed, the larger the capacity, on the contrary, the lower the motor speed, the larger the size and weight of the coupling; the hydraulic coupling with power greater than 100k W requires an additional cooler and piping system. Ma Steel uses Shanghai YDT45/30 speed governing fluid coupling on the 300m state min converter blower. The speed range is 19%~97% of the actual motor speed, and the average hour saving is 292kw “h, investment for more than three months. That is, the Y4-73-1122D dust removal fan of the Shougang blast furnace outlet site is equipped with the YOTC-800 hydraulic coupling developed by Shougang, with an annual electricity saving of 7.74 million kW·h.