For the noise of the cooling fan, the larger the air volume, the greater the noise. The noise is caused by vibration, incorrect installation angle, high wind pressure, differences in equipment structure, fan material, etc., all of which can affect the fan noise value. Cooling fans are used in indoor environments and household appliances, and have high noise requirements. Therefore, any measures that can reduce fan noise can be considered in the design. Below are several measures to reduce fan noise.
1. Ball bearings are used to reduce the noise of the cooling fan. The fan adopts bearings with oil bearings and roller bearings. Oil bearings have low noise in the early stage when the lubricating grease is sufficient. As the use time increases, the lubricating grease evaporates, increasing the gap between the stator and rotor and generating more vibration, resulting in higher noise. Therefore, using ball bearings would be better.
2. Reducing the speed to reduce the noise of the heat dissipation fan can significantly reduce the noise while meeting the heat dissipation needs. Alternatively, installing two heat dissipation fans to reduce the speed by half can ensure air flow.
3. Correct installation can reduce the noise of the cooling fan. Due to differences in equipment design and materials, correct installation can reduce resonance of the equipment. The four corners of the fan must be on the same plane, and the screw tightness should be the same. If the material of the installation position is prone to resonance noise, rubber and other cushioning pads can be added to the four corners of the fan installation.
4. Reducing wind pressure to reduce fan noise involves the design of the fan itself and equipment, the angle and smoothness of the fan blade design, the overall concentration of the designed air, and the equipment. Regardless of whether it is blowing or suction, any component in the same direction as the air duct should be designed to reduce wind resistance as much as possible. For example, when the fan blows through the radiator, each end of the radiator can be designed with a tip, which will reduce wind resistance.