Air intake construction of axial flow fan

Abstract

Disclosed is an air intake structure of the axial-flow fan, which comprises a shell body and an impeller. The shell body has a supercharging air inlet and an air flow channel. The impeller is arranged in the airflow channel and has a hub and several vanes. The vane ring is arranged outside around the hub and has an air inlet side separately. The air inlet side is formed on the radial climax of each vane and the most front end of the wind dispelling direction, and at the same time on the radial range of the super charging air inlet. When the impeller is rotating, the vane first has point wind contact from the air inlet side end, and then drives plenty of airflow into the supercharging air inlet to reduce the noise of wind contact.

Description

technical field [0001] The present invention relates to an air inlet structure of an axial flow fan, in particular to forming the end points of the air inlet side of each blade at the highest point in the axial direction and at the forefront of the wind driving direction, and between the axial range of a pressurized air inlet Inside, to reduce the wind shear noise of the wind-inlet side structure. Background technique [0002] For the air intake structure of conventional axial flow fans, please refer to figure 1 Disclosed U.S. Patent No. 4734015 "Axial-Flow Fan" invention patent, U.S. Patent No. 4743173 "Slide Bearing Unit for Small Size Fan" invention patent, U.S. Patent Invention patents of Re34456, No. 4806081 and No. 4992029 "Miniature Axial Fan"; U.S. Patent No. 5028216, No. 5135363 and No. 5267842 "Miniature Direct Current Fan" )" invention patent, etc., which include a housing 10 and a fan wheel 20. The housing 10 is square, and it has an air inlet end face 11 (inle...

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Problems solved by technology

[0003] Even so, there are still following other problems in this axial flow fan in actual use, for example: the blades 22 of the straight sheet shape almost form a right angle at each inlet side endpoint 221 (inlet corner), and the inlet side endpoint 221 is also at the same time Within the axial range of the supercharged air inlet 12. As a result, when the blade 22 drives a large amount of airflow into the supercharged air inlet 12, a large amount of airflow will be squeezed into the supercharged air inlet 12, resulting in the impact of a large amount of airflow The end point 221 of the wind inlet side is easy to generate wind shear noise. Moreover, the top edges 220 (inlet edges) of the wind inlet side of the straight blades 22 are formed on the same plane with almost equal heights. As a result, when the When the blades 22 rotate, the top edge 220 on the wind-intake side of each blade 22 simultaneously performs the wind shearing and driving wind action in the linear wind shearing mode. Since the linear wind shearing action disturbs a large amount of airflow, it is also easy to generate wind shearing noise. Therefore, still It is necessary to further improve the air intake structure of the above-mentioned axial fan.

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