1. Blade curvature: Within a certain range of the DC cooling fan, the greater the blade curvature, the same speed, the greater the gas kinetic energy, that is, the greater the air volume and pressure; at the same time, the greater the blade resistance, the greater the motor torque required.
2. Motor diameter: Due to the existence of the motor and the bearing, there must be no air flow through the blind zone in the central part of the DC cooling fan main shaft. The diameter of the main shaft will determine the size of this blind zone. A large number of spindle diameters mainly depend on the power of the fan motor-the high power of the motor requires a larger stator winding coil, which must take up more space, without longitudinal expansion (increased height), and then must be expanded horizontally (increased area).
3. Blade curvature: In addition to a certain curvature in the cross section, the blades of the DC cooling fan do not extend vertically in the radial direction on the overhead plane, but extend slightly in the direction of rotation.
There are twists and turns, and there is a certain arc. If the blades extend vertically in the radial direction, the air flow driven by the rotation of the DC fan will be dispersed on one side of the outlet, and the air supply interval is short and strong.
Not concentrated; if the current product version has a slight arc, it can ensure that the airflow is concentrated in the columnar space, spacing and wind pressure in front of the air outlet.
4. Blade spacing: If the spacing between the blades is too small, it will cause airflow disturbance, increase the surface friction of the blades, and reduce the efficiency of the fan; if the spacing between the blades is too large, it will lead to increased pressure loss and insufficient wind pressure.
