Flow guiding device for large axial flow fan

Abstract

The invention provides a flow guiding device for a large axial flow fan. The flow guiding device is sequentially composed of an air inlet section, a flow guiding section and a main machine section; the air inlet section comprises an air inlet and an air cover; the flow guiding section comprises a flow guiding cylinder outer air cylinder, an inner cone cylinder and a rectifying cover which is in butt joint with the front end of the inner cone cylinder; the main machine section comprises an impeller motor, a main machine outer air cylinder connected with the flow guiding cylinder outer air cylinder and a main machine inner air cylinder connected with the inner cone cylinder; the flow guiding section further comprises a first wing-shaped supporting piece which is used for connecting the flowguiding cylinder outer air cylinder and the inner cone cylinder; and the main machine section further comprises a second wing-shaped supporting piece which is used for connecting the main machine outer air cylinder and the main machine inner air cylinder. According to the device, a wing-shaped flow guiding structure is adopted, so that the generation of Karman vortex street is prevented, the pneumatic efficiency of a fan is improved, the ventilation effect is good, the efficiency is high, and the vibration is low; and meanwhile, the rigidity and the strength of the fan are enhanced, the requirement for safe and reliable operation of the fan is met, and the heat dissipation effect of the impeller motor is improved.

Description

technical field [0001] The invention relates to the field of fan technology, in particular to a flow guiding device for a large axial flow fan, which can prevent the generation of Karman vortex street. Background technique [0002] Fans are mainly used for ventilation in various places. Large capacity, high efficiency and low noise are the development direction of fan technology. The main features of large-capacity, high-efficiency, low-noise fans are large air volume and pressure, small vibration, low loss along the way, and the efficiency per unit volume is 1.1-1.2 times that of ordinary fans. Therefore, how to increase the air volume and pressure of the fan, reduce vibration, and reduce loss along the way is the primary research topic. [0003] The flow guide device of a large axial flow fan has a great influence on the efficiency, structure, aerodynamic performance, vibration and maintenance of the entire fan. When the gas inside the fan flows, it will change the flow ...

AI Technical Summary

Problems solved by technology

When the gas inside the fan flows, the impact on the obstacle will cause the flow direction to change, resulting in a decrease in the effective dynamic pressure of the gas and an increase in vibration, resulting in Karman vortex street phenomenon, which will cause unreasonable impact on the impeller surface and cause damage to the impeller and shorten the life of the impeller.

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