What exactly is a notebook circular cooling fan?portable mini handheld fan

　　Everyone needs a computer in their daily work, but traditional desktop computers take up space and are not easy to carry around. Therefore, laptops are now the choice of many people. During the operation of the notebook, heat is generated, and the heat is dissipated by the notebook circular cooling fan. Here we will learn more about the notebook circular cooling fan.

　　Installation size

　　CPU fans mainly use 60, 70, 80, 120 or even 140. What does this model mean? We know that the frame shape of the CPU fan is square, and its model is the side length of the square. For example, if the frame side length of a fan is 60 mm, the model number is 60. In addition, there are thick and thin fans, and the fans for CPU are all thin. Fans of the same size are interchangeable. For example, the fans of Tt Volcano 9 and Coolermaster HV81 are 80 type, you can remove the fan of Volcano 9 and install it on the heat sink of HV81, there is no problem at all. There are also some specially designed fans that cannot be interchanged with other fans, such as the fan of Intel's original radiator, which is connected with the fastener and cannot be replaced.

　　Bearing type

　　It can be roughly divided into three categories: sliding bearings, ball + sliding bearings and double ball bearings.

　　Among the three types of bearings, the sliding bearing has the smallest noise, but the shortest life and is also greatly affected by the environment. Double ball bearings are noisy, but have a longer life and a simpler manufacturing process, making them the mainstream. There are also some improved sliding bearings, which greatly extend its life on the premise of maintaining low noise, and become the darling of some high-end radiators. Among them, the more excellent improved types are Sunon's magnetic bearing and AVC's hydraulic bearing.

　　blade shape

　　There are sickle type, trapezoid and AVC patented flange type, etc.

　　Relatively speaking, the sickle-shaped fan blade is relatively quiet when running, but the wind pressure is also small; the trapezoidal fan blade is easy to generate a large wind pressure, but the noise is relatively large. Flanged type is the best design, which can generate high wind pressure while maintaining low noise, but it is rare.

　　Number of leaves

　　CPU fans usually have between 6 and 12 blades.

　　Generally speaking, those with a small number of blades are prone to generate larger wind pressure, but the operating noise is also larger; while those with a larger number of blades are just the opposite.

　　Wind direction

　　Divided into axial flow and centrifugal two.

　　As the name suggests, the axial flow direction is along the direction of the fan shaft, that is, the direction perpendicular to the rotating surface of the blade; the centrifugal type is the radial direction of the rotating surface of the blade. CPU coolers basically use axial fans, and only Coolermaster's "tornado" series uses centrifugal fans. From a practical point of view, the wind generated by the centrifugal fan is not fully utilized, but it will increase the working noise, so it is not a good choice. However, the radiator with centrifugal fan is easier to achieve a very thin shape, so it is often used in some graphics card cooling systems.

　　spinning speed

　　It can be roughly divided into two types: strong type and silent type.

　　This classification method is not too strict, but for fans of the same size and type, wind pressure and noise are always two contradictions that cannot be reconciled.

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