Axial flow fan blade structure, axial flow fan and preparation method of axial flow fan

Abstract

According to the axial-flow fan blade structure, the axial-flow fan and the preparation method of the axial-flow fan, a concave structure is arranged on the outer edge of the axial-flow fan, so that a blade top gap in a region with relatively strong interaction between a blade and an air guide ring is increased, a blade top gap in a region with relatively weak interaction between the blade and the air guide ring is reduced, and an internal flow field is improved under the condition that the fan blade area and the air volume are kept unchanged; the flowing state of airflow in the middle of the outer edge of the blade after flowing through the suction surface of the blade is improved, the blade top leakage vortex in the area is effectively controlled, and the turbulence energy intensity near the blade top is reduced; meanwhile, airflow at the tail of the outer edge of the blade falls off to be away from the suction surface of the blade, local pressure pulsation of the surface of the blade is improved, the turbulence energy intensity of an internal flow field is reduced by controlling the blade top leakage vortex at the blade top gap and the falling vortex direction at the tail edge, the surface pressure pulsation of the blade and the air guide ring is weakened, and fan noise is effectively improved.

Description

technical field [0001] The invention relates to the technical field of fans, in particular to an axial flow fan blade structure, an axial flow fan and a preparation method thereof. Background technique [0002] As a traditional fluid machine, axial fans are widely used in factory ventilation, mine ventilation, and household appliances. With the environmental protection requirements of the current society and the continuous improvement of people's quality of life, the noise problem of axial flow fans has attracted more and more attention from designers and developers. [0003] The noise of air-conditioning equipment is mainly composed of vibration noise, aerodynamic noise, electromagnetic noise, etc. Among them, the aerodynamic noise of the axial flow fan for external units occupies a large proportion. The aerodynamic noise of the axial flow fan is mainly caused by the fluid acting on the rotating blades and stationary parts such as the wind guide ring and other structures. ...

AI Technical Summary

Problems solved by technology

At the same time, due to the pressure difference between the pressure surface and the suction surface of the blade, the airflow rolls from the pressure surface to the suction surface at the outer edge of the blade to form a leakage vortex at the tip of the blade, which makes the vortex noise in this area larger

In addition, the design of the angle of attack of the fan blade and the design of the hub will also have a certain impact on the noise of the axial flow fan.

[0004] Controlling the fan rotation noise by reducing the fan speed is a common noise control method, but this method has an impact on the air volume performance of the fan; adding sound insulation cotton inside the air conditioner can improve the noise performance to a certain extent, but it will increase the product cost; adjust the outer edge of the fan blade The blade tip clearance with the air guide ring can effectively control the blade tip leakage vortex, but it will affect the overall performance of the fan, and this method requires high machining accuracy

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