Cooling fan believes that we are all not strangers, now all aspects of the equipment are generally used, in the general user to buy a cooling fan when the most attention to look at its air volume size, noise, power consumption and other fan parameters, but the fan blade users are rarely concerned, the parameter performance has been confirmed, but we are not clear is that the fan blade actually affects the performance of the cooling fan, and then we understand one by one, how does the fan blade affect the performance of the cooling fan, how about the doorway inside?
1. The smoothness of the blade
The smoothness of the cooling fan blade, if the fan blade is not smooth and flat enough, the workmanship is rough, the cooling fan will produce turbulence during operation, increase friction, so the noise increases, which depends on the supplier's mold forming and post-processing process.
2. The spacing of the blades
We will know that the general narrow fan blade spacing will be relatively large, resulting in the dispersion of the air flow, affecting the flow of air flow, therefore weakening the heat dissipation performance of the fan, the air volume is not enough, the wind pressure is insufficient, but if the distance of the fan blade is too small, it will lead to poor air flow, increase the friction of the blade surface, and affect the speed of the fan.
3. The number of fan blades
General cooling fan fan structure is 5, 7, 9, 11 and other odd composition, because the even number of fan blades is symmetrical, so that not only makes the cooling fan itself difficult to adjust the balance, but also easy to make the cooling fan resonance, will make the blade or axis fracture, so are the use of odd numbers of fan blades, and in other parameters of the case to increase the number of fans, the more fan blades the more air volume, mainly because the mountain field to divide the air flow into multiple parts, the pressure of the air flow on the fan blade will be reduced accordingly, Then the friction between the air flow and the mountain will be reduced accordingly, but the wind pressure will be reduced accordingly.
4. Blade inclination
At the same speed, if the inclination angle of the blade is greater, the wind pressure on the upper and lower surfaces of the blade is also greater. If the surface pressure on the fan is too large, it may cause a reflux phenomenon, which will reduce the performance of the fan. Therefore, the inclination angle of the fan blade should also be reasonably designed.
5. Blade curvature
In a certain range, if the blade curvature is larger, the greater the gas kinetic energy at the same speed, that is, the greater the air volume and wind pressure, and the greater the resistance of the blade, requiring the torque of the motor to be greater.
6. The curvature of the fan blade
In addition to having a certain curvature on the cross-section, the fan blade does not extend straight along the radial direction in the overhead plane, but slightly curved in the direction of rotation, showing a certain arc. If the blade extends straight along the radial direction, the air flow driven by the fan rotation will be scattered on the side of the air outlet, the air supply distance is short, and the "power" is not concentrated; if the current product version is slightly curved, it can be guaranteed that the air flow is concentrated in the columnar space directly in front of the air outlet, increasing the air supply distance and wind pressure.
Thank you for reading, pay attention to us to learn more about cooling fan knowledge, thank you!
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