What are the common problems with cooling fans?

As more and more transistors are integrated into microprocessors, although process technology is constantly improving, the energy consumption and heat of computers have always been high, and the heat dissipation problem must attract everyone's attention. There are various cooling systems for computers, such as water cooling, semiconductor cooling, oil cooling, etc. But we often use cheaper air cooling, which is a combination of cooling fans and radiators. There are two main types of equipment that use cooling fans for desktop computers, one is the power supply, the CPU. The power supply fan generally has a longer life due to the design topic, and the CPU cooling fan is a consumable. Because the desktop host is large, we usually put it in a place that is not easy to move and disassemble. As the use time increases, the computer may have more or less malfunctions during use, and the computer's heat dissipation cannot rotate or the speed cannot reach the set speed. So how should we deal with this situation?
Due to the working environment or long-term non-cleaning of the computer host, our computer fan is full of dust. No fan cleaning will cause excessive dust accumulation, resulting in poor fan operation, loud noise, and difficulty or inability to rotate the fan. We only need to clean the dust inside the computer power fan. The bearing plays a major role in the fan transfer. When the user's computer is used for a long time, the bearing lacks lubricating oil, and high-speed rotation during the use of the computer will produce noise, so you need to drip a few drops of lubricating oil on the fan bearing. If there is no lubricating oil, you can also use sewing machine oil instead, but don't use cooking oil instead, because the cooking oil particles are large and will damage the bearing. If the cooling fan used by the user is of poor quality, due to process defects, the center of gravity of the fan blade may not be on the shaft, resulting in the center of gravity of the fan not being in the middle. After long-term use, the fan's center of gravity offset will become more and more serious, not only will it produce noise, but it will also seriously damage the CPU. The solution is: remove the fan, and then hang it in the center with a thin wire. After it stops, see which direction it sinks. Grind the sinking end on the grinding wheel several times, and then test it until the fan is in a horizontal position, and then install it. Or directly updating a new cooling fan can also solve the problem.

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