When it comes to the characteristics of cooling fans, if you have a little understanding of cooling fans, you should know some. The choice of cooling fan can be selected from main parameters such as bearing, air volume, air pressure, size and so on. So, how to judge the performance of the cooling fan?

 

Cooling fan

Oil bearings and ball bearings are widely used in cooling fans. In general, oil-impregnated bearings have lower prices and lower early rotation noise. Some manufacturers add polytetrafluoroethylene to the oil bearing to make the oil bearing have the characteristics of a ball bearing, and finally the manufacturer increases the price of the rolling bearing. The noise of the ball bearing cooling fan is higher than that of the oil bearing, and the price is higher than that of the oil bearing, but its advantages are high reliability and long service life.

 

The advantages of a large cooling fan depend on the length of the fan blades and a larger total heat dissipation area, so the total air flow is very large. If the design is not good, the heat dissipation capacity of a large fan will be inferior to that of a small fan. Look at the blades of the cooling fan. If the other components of the same electric fan remain the same, and only change the blades from 5 to 7 blades, the change in exhaust volume will not be easily improved. But judging from the speed of the electric fan, the speed ratio of 7 fan blades will be less than the speed of 5 fan blades. Relatively speaking, if you choose a cooling fan with 7 fan blades, the rolling bearing will be damaged and the oil leakage will be less. Longer service life.

 

Cooling fan

If the speed ratios of five fan blades and seven fan blades are the same, the exhaust volume of the seven fan blades will be larger. The higher the speed of the cooling fan, the shorter the relative service life and the greater the noise. In addition, the thicker the fan blades, the greater the blade angle and the greater the wind pressure.