What are the working principles of DC cooling fans?
Category:
Industry Trends
Release time:
2020-09-28
DC cooling fan I’m sure everyone has heard about it—so how does it actually work? Let’s dive into an analysis together, as explained below.
1. Blade Curvature: For DC cooling fans, within a certain range, the greater the blade curvature, the higher the gas kinetic energy at the same rotational speed—resulting in greater airflow and higher static pressure. At the same time, the greater the blade curvature, the higher the blade resistance, and thus the greater the motor torque required.
2. Motor Diameter: Due to the presence of the motor and bearings, the central portion of the DC cooling fan’s spindle inevitably becomes a dead zone where no airflow passes through. The diameter of the spindle determines the size of this dead zone. The spindle diameter largely depends on the power rating of the fan motor—the higher the motor power, the larger the stator winding coils required, which in turn occupy more space. Without allowing for longitudinal expansion (i.e., increasing the height), the motor must compensate by expanding horizontally (increasing the area).
3. Blade Curvature: In addition to having a certain degree of curvature in their cross-section, the blades of DC cooling fans do not extend vertically along the radial direction on the airfoil plane; instead, they slightly extend toward the direction of rotation.
It has curves and a certain degree of curvature. If the blades extend vertically along the radial direction, the airflow driven by the DC fan’s rotation will be concentrated on one side of the outlet, resulting in short air delivery intervals and reduced intensity.
Not concentrated; if the current product version exhibits slight arcing, it can ensure that the airflow is concentrated in the columnar space, gaps, and air pressure located at the front of the air outlet.
4. Blade Spacing: If the spacing between blades is too small, it can cause airflow disturbances, increase friction on the blade surfaces, and reduce fan efficiency. If the spacing between blades is too large, it can lead to increased pressure loss and insufficient wind pressure.
The above is the working principle of DC cooling fans. For more details and information, please visit our company’s official website!
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