Fan blade suitable for axial flow fan with front motor frame

Abstract

The invention discloses a fan blade suitable for an axial flow fan with a front motor frame. The fan blade comprises a wheel rim and a plurality of blades which are evenly distributed on the peripheral face of the wheel rim and are of a three-dimensional twisted structure, wherein a plurality of pits which are arranged in a matrix mode are formed in a windward side of each blade, each row of pits are arranged in a flow direction at the same spanwise height, flow direction spacing S of each row of pits is equal, and spanwise spacings C between the rows are equal. According to the invention, the pits formed in the windward sides of the blades have the effect of a vortex generator, and low-speed areas are formed in the pits when airflow flows through the blades, so that thickness of a boundary layer of a pressure surface is increased, and outlet pressure of a fan is improved; and meanwhile, vortex structures are formed in the pits when the airflow flows through the pits, so that the turbulence energy level of the boundary layer is improved, the boundary layer is transited in advance, a large-scale vortex structure formed by streaming of a motor frame is favorably damaged, small-scale isotropic turbulence is formed, turbulence noise is reduced, flowing uniformity is improved, a flowing state of the fan is improved, and performance of the axial flow fan is further improved.

Description

technical field [0001] The invention belongs to the field of energy and power, and relates to a fan blade suitable for an axial flow fan in front of a motor frame. Background technique [0002] Axial flow fans are widely used in aerospace, industrial ventilation and heat dissipation, medical and health and other fields. Its working principle is to use the motor to drive the high-speed rotating blades to do work on the air, so that the air is exported from the air outlet after obtaining a certain flow velocity and pressure. The pressure-flow curve and noise level of axial flow fans are the two most important performance indicators of axial flow fans, which have a decisive impact on product competitiveness. [0003] The existing motor frame of the axial flow fan has two ways of front installation and rear installation. Compared with the rear installation of the motor frame, the front installation of the motor frame can effectively improve the efficiency of the axial flow fan. ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a fan blade suitable for the axial flow fan in front of the motor frame, and solve the technical problem of large-scale vortex caused by the front installation of the motor frame

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