Blade perforated small axial fan

Abstract

The invention discloses a blade perforated small axial fan. Although the existing fan is good, the pulse of upward force of a fan blade is still instable. The fan comprises a case, a motor fixing bracket, a motor, a hub and perforated blades; the perforated blades are arranged on the hub along a circumference direction in equal distance; the hub is connected with the motor through a rotary shaft; the motor is fixed on the motor fixing bracket; the motor fixing bracket is fixed in the case; three rows of round holes are formed in the perforated blades; the numbers of each row of round holes are respectively 4, 3 and 4; the distribution area of the round holes are located in a area with a higher pressure on a pressure surface and a lower pressure on a suction surface of the fan; the first row of round holes is located in front of a separation point; and the value range of the ratio of the diameter D of the each round hole to the distance L between adjacent two round holes is 0.3-0.8. With the adoption of the fan provided by the invention, the vortex separation point of the outlet area can be moved towards down stream; the turbulent intensity can be weakened; and the disadvantages that the pneumatic performance of the fan is poor, the pulse of upward force of the blade is instable, and the pneumatic noise radiation is increased can be improved.

Description

technical field [0001] The invention belongs to the technical field of cooling fans, in particular to a small axial flow fan with perforated blades. Background technique [0002] At present, electronic components such as computers and electronic instruments usually use small axial flow fans as heat dissipation components. As the power of electrical equipment continues to increase, the demand for cooling fans with high ventilation and low noise is increasing. The instability of the pulsation of the lift force of the fan blade increases the radiation of aerodynamic noise, which not only wastes energy but also pollutes the environment. Therefore, there is an urgent need to design a small axial flow fan, so that at the operating point, not only does not cause the pressure rise of the fan to decrease, but also reduces the noise. Contents of the invention [0003] The object of the present invention is to address the deficiencies of the prior art and provide a small axial flow...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies of the prior art and provide a small axial flow fan with perforated blades to overcome the instability of the fan blade lift force pulsation and the shortcomings of increased aerodynamic noise radiation

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