The experience and belief of Chengdu Power Machinery Factory in adopting this technology in recent years believes that the economic benefits of using zigzag middle plate are various: it is well known that excessive deflection is a fatal defect of long-span support distance of double suction fan, long-term smoke. The high temperature is also unfavorable to the rotor stiffness, so the impeller weight reduction not only increases the stiffness, but also reduces the forced vibration of the rotor, improving the critical speed and safety reliability of the fan.
In general, in order to prevent wear, the impeller often uses thickened blades or welded anti-friction guards, which increases the inertia of the impeller, and after the slot is grooved, the inertia of the original impeller is reduced by 10~20, and the moment of inertia is reduced. It is an element that restricts the capacity of the motor. Generally, the startup time is shortened to approximately 10~20. Under long-term operating conditions, the motor starting current is too large and the coil is overheated, which saves electricity costs and improves the safety of the motor. Service life. In addition, when the motor model is selected, the power reserve factor can also be lower than the general standard value. Usually, the lower first gear motor can be selected, which can reduce the investment cost of the equipment.
Due to the particularity of fluid viscosity (liquid viscosity is mainly the attraction between molecules, which decreases with increasing temperature), the gas is mainly represented by the exchange of momentum between molecules, so the temperature increases and the viscosity increases. For the boiler induced draft fan The temperature of the flue gas passed is approximately 140e, and there is friction along the flow path wall in the flow to form a boundary layer with a flow rate of zero or negative (also known as the boundary layer). For the double suction impeller, the middle disc is symmetric. For the two flow paths, it is conceivable that the removal of the middle spacer layer of the two parallel flow paths is equivalent to partially canceling the two boundary layers, and the flow velocity distribution shape of the region is changed from the original /B0 shape to the /D0 shape. The elimination of the loss is sufficient to prove that the saw-toothed slot in the middle plate has a certain beneficial effect on the aerodynamic performance.
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