The influence of fan blade parameters on the performance of cooling fan
The influence of fan blade parameters on the performance of cooling fan
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u003cbru003e 1. The curvature of the blade: within a certain range, the greater the curvature of the blade, the greater the airflow, and the greater the resistance the blade bears, which requires greater motor torque.
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u003cbru003e 2. Blade inclination angle: the greater the inclination angle, the greater the pressure between the upper and lower surfaces of the blade, and the greater the wind pressure at the same speed. However, if the surface pressure is too large, it may cause a backflow phenomenon and reduce the fan performance, so the blade inclination angle should also be Within a certain limit, the inclination angle of the 9 blades of the fan is larger than that of the 7 blades. Most 7-blade fans have a smaller blade inclination angle. Wenling Tongchi Automobile Air Conditioning Manufacturing Co., Ltd. produces cooling fans with large air volume, low noise and long life.
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u003cbru003e 3. Blade spacing: If the distance between the blades is too small, it will cause airflow disturbance, increase the friction on the blade surface, and reduce the fan efficiency. If the distance between the blades is too large, it will lead to increased pressure loss, insufficient air pressure, and blade spacing It refers to the distance between the same edge of two adjacent blades.
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u003cbru003e 4. The number of blades: the cross-section curves and inclination angles of fan blades of various specifications are basically the same. The width of each blade is often determined by the height of the blade. In order to ensure that the blade spacing will not be too large to affect the wind pressure, the diameter height comparison Small (ie relatively thin) fans are compensated by increasing the number of blades. No matter the number of blades, the number of middle blades of axial fans is often odd numbers such as 3, 5, 7, 9, 11, etc. This is due to the use of even numbers The fan blades with symmetrical shape, without being adjusted and flat, can easily cause the system to resonate, and the blade material cannot resist fatigue caused by vibration, which will cause the blade or the shaft core to break.
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u003cbru003e 5. Blade tip clearance: How to adjust the gap between the fan blade and the outer frame is a big problem in the design (Wenling Tongchi Automobile Air Conditioning Manufacturing Co., Ltd. has professional designers and mold room masters to ensure If the gap is too small, it will cause friction between the airflow and the blades and the outer frame, which will increase the noise. Increasing the gap will reduce the efficiency of the fan due to the influence of ground flyback airflow.
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u003cbru003e 6. Blade curvature: In addition to the curvature of the section, the fan blade does not extend straight along the radial direction in the top view plane, but is slightly curved in the direction of rotation, showing a certain arc. Straight extension, the air flow brought by the fan speed will be scattered on the side of the air outlet, the air supply distance is short, and the power is not concentrated, such as the current product has a slight curvature, the side can ensure that the blowing air is concentrated in front of the air outlet and columnar In the space, increase the air supply distance and wind pressure.
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u003cbru003e 7. Motor diameter: Due to the existence of the motor and the bearing, it is inevitable that the central part of the axial fan spindle is located in the blind zone where there is no air flow. The spindle diameter determines the size of the blind zone, and the size of the spindle mainly depends on the fan motor High-power motors require larger stator winding coils, which inevitably take up more space. If they cannot be expanded vertically (increased height), they have to expand horizontally (increased area).
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u003cbru003e 8. Blade smoothness: This is an index affected by non-design factors, which basically depends on the manufacturer's post-processing process of mold formation. At the design curve, the imbalance on the blade will cause turbulence during rotation , Increased friction reduces fan efficiency, compromises fan performance, and increases operating noise.
