Double-rotor axial flow fan

Abstract

The invention provides a double-rotor axial flow fan which comprises an upper shell and a lower shell, and an upper rotating shaft and a lower rotating shaft are rotationally arranged in axis fixing holes of the upper shell and the lower rotating shaft through bearings. Rotor assemblies are fixedly arranged at the two adjacent ends of the upper rotating shaft and the lower rotating shaft, and an inner impeller is fixedly arranged on the rotor assembly fixed to the upper rotating shaft. And an outer impeller is fixedly arranged on the rotor assembly fixed on the lower rotating shaft. The inner impeller and the outer impeller are arranged on the same plane, and the inner impeller fan blades of the inner impeller are arranged between the outer impeller fan blades of the outer impeller and the rotor assembly. Dynamic sealing structures are adopted between the inner impeller and the outer impeller and between the outer impeller and the shell of the axial flow fan, air backflow can be effectively avoided, and the air supply efficiency is greatly improved. In addition, the rotating speed of the inner impeller and the rotating speed of the outer impeller of the axial flow fan can be independently controlled, the pressure difference between the rotating shaft and the inner wall of the shell is reduced by increasing the rotating speed of the inner impeller, and gas backflow at the blade root of the inner impeller is reduced.

Description

technical field [0001] The invention relates to the technical field of axial flow fans, in particular to a double rotor axial flow fan. Background technique [0002] In existing production and life, axial flow fans are widely used. To achieve a certain air volume, the axial flow fan needs to increase the speed. When the speed is increased to a certain speed, the air supply efficiency will be greatly reduced, and because of the high speed and production and installation errors, it will also cause vibration and noise of the fan blades. Moreover, the vibration will bring certain damage to the equipment, and the noise will affect the environmental quality of people's production and life. Effectively reducing the operating noise of the fan will help improve the noise environment in our production and life, and enhance the user experience. [0003] In addition, the existing axial fan is usually a single impeller, and the rotational speed at the blade root of the impeller is much...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a double-rotor axial flow fan to solve the problems in the prior art such as large fan vibration, strong noise, weak air supply capacity and easy gas backflow.

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