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What is the role of fan blades in DC fans
The DC fan converts electrical energy into machinery through DC voltage and electromagnetic induction to drive the fan blades to rotate, so the fan casing and blades are an integral whole, and most people know that these two parts are very important, so their What role does it play?
First, the blade curvature: the DC fan is within a certain range, the greater the blade curvature, the greater the kinetic energy of the gas at the same speed, that is, the greater the air volume and wind pressure; at the same time, the greater the resistance of the blade, the motor is required The torque is greater.
Second, the diameter of the motor: due to the presence of the motor and the bearing, the central part where the main shaft is located inevitably has no blind area through which the air flow passes, and the diameter of the main shaft 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 occupy more space. In the case of no vertical expansion (adding height), they have to expand horizontally ( Increase the area).
Third, the blade curvature: In addition to a certain curvature in the cross section, the fan blade does not extend vertically in the radial direction in the plan view, but slightly twists in the direction of rotation, showing a certain curvature. If the blades extend vertically in the radial direction, the airflow driven by the rotation will be scattered on the side of the air outlet, the air supply interval is short, and the "force" is not concentrated; if the current product version is slightly curved, it can ensure that the airflow is concentrated in In the cylindrical space directly in front of the air outlet, the air supply interval and air pressure are added.
Fourth, the blade interval: the interval between the blades is too small, will cause airflow disturbance, add friction on the blade surface, reduce the efficiency of the fan; the interval between the blades is too large, it will lead to increased pressure loss and lack of wind pressure.
First, the blade curvature: the DC fan is within a certain range, the greater the blade curvature, the greater the kinetic energy of the gas at the same speed, that is, the greater the air volume and wind pressure; at the same time, the greater the resistance of the blade, the motor is required The torque is greater.
Second, the diameter of the motor: due to the presence of the motor and the bearing, the central part where the main shaft is located inevitably has no blind area through which the air flow passes, and the diameter of the main shaft 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 occupy more space. In the case of no vertical expansion (adding height), they have to expand horizontally ( Increase the area).
Third, the blade curvature: In addition to a certain curvature in the cross section, the fan blade does not extend vertically in the radial direction in the plan view, but slightly twists in the direction of rotation, showing a certain curvature. If the blades extend vertically in the radial direction, the airflow driven by the rotation will be scattered on the side of the air outlet, the air supply interval is short, and the "force" is not concentrated; if the current product version is slightly curved, it can ensure that the airflow is concentrated in In the cylindrical space directly in front of the air outlet, the air supply interval and air pressure are added.
Fourth, the blade interval: the interval between the blades is too small, will cause airflow disturbance, add friction on the blade surface, reduce the efficiency of the fan; the interval between the blades is too large, it will lead to increased pressure loss and lack of wind pressure.
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