The DC cooling fan undergoes DC voltage and electromagnetic induction, and converts electrical energy into machinery to drive the blades to rotate. Therefore, the fan shell and blades are an indispensable whole. Most people know these two parts are very important, so they What kind of role does it have?

      First, the curvature of the blade: within a certain range of the DC cooling fan, the greater the curvature of the blade, the greater the kinetic energy of the gas at the same speed, that is, the greater the air volume and pressure; at the same time, the greater the resistance of the blade, the requirement The torque of the motor is greater.

      Second, the diameter of the motor: Due to the existence of the motor and the bearing, the Zhongxin part where the DC fan spindle is located will inevitably have no blind area through which air flows. The diameter of the spindle determines the size of the blind area. The huge details of the spindle diameter mainly depend on the power of the fan motor-high-power motors require larger stator winding coils, which must take up more space. If they cannot be expanded vertically (add height), they have to expand horizontally ( Increase area).

      Third, the blade curvature: In addition to a certain curvature in the cross section of the DC cooling fan blade, it does not extend vertically in the radial direction in the top view plane, but slightly twists in the direction of rotation, showing a certain curvature. If the blades extend vertically in the radial direction, the air flow driven by the rotation of the DC cooling fan will be scattered on the side of the air outlet, the air supply interval is short, and the "strength" is not concentrated; if the current product version has a slight curvature, it can guarantee the blowing The airflow is concentrated in the columnar space directly in front of the air outlet, adding air supply interval and wind pressure.

      Fourth, blade spacing: If the spacing between the blades is too small, it will cause airflow disturbances, increase the friction on the blade surface, and reduce the efficiency of the bottom electric fan; if the spacing between the blades is too large, it will lead to increased pressure loss and lack of wind pressure.