Bearing type: CPU fans are divided into three types according to the different bearings: sliding bearing, ball+sliding bearing and double ball bearing. Among the three kinds of bearings, sliding bearing has the least noise, but the shortest life and is greatly influenced by the environment. Double ball bearings are the mainstream because of their high noise, long service life and simple manufacturing process.
Air outlet direction: according to the different air outlet direction of CPU fan, it can be divided into axial flow type and centrifugal type.
Number of blades: CPU fans usually have 6 blades to 12 blades. The less the number of blades, the greater the wind speed, but the greater the running noise; And the number of blades is just the opposite.
Blade shape: CPU fans are sickle-shaped, trapezoidal and AVC patented flanging.
Extended data:
Principle of CPU fan:
The main performance of the fan is reflected in the following aspects: speed, blade shape, blade angle and bearing system. Generally speaking, the rotating speed of the fan is indicated in the instruction manual of the radiator. Generally speaking, 30% of the heat dissipation effect of radiator depends on the speed of fan. But the higher the fan speed, the better.
The correct fan speed should be determined according to the calorific value of CPU, and the selection of fan speed of different specifications should be different. The basic principle is: under the premise of generating the same air volume, the larger the fan, the lower the rotation speed and the lower the noise. Generally, the rotation speed between 3500 and 5200 rpm is more conventional.