What is the reason that the CPU fan is loud?

Fan blade "Eccentric" is the main cause of noise. The quality of the fan, the center of its fan blades on the axis, operation is very smooth, the noise is very small, and the inferior fan, often there is a certain deviation, the center of gravity is not in the axis of the "eccentric", such a fan turned up, the equivalent of an oscillator (oscillator is in the motor shaft plus an eccentric wheel), With the use of the longer time, fan bearings gradually wear, or fan heatsink installation is not strong, loosening, etc., will make the vibration increase noise. The simplest solution to this type of failure is to try to install the fan firmly so that it does not vibrate, of course, this method does not solve the substantive problems, because fan blades are still "eccentric";

Another method is to inject oil into the fan bearing, to cushion the vibration, thereby weakening the noise; there is also a way to fundamentally solve the problem: To remove the blades, with a thin line through the center of the fan blade to lift the fan blade, if one end of the drop, indicating that the end is heavier, can be grinding a few times on the grinding wheel, so after a few, and then with a thin line hoist , if the blades can be stationary at the horizontal position, the transformation is successful.

Some problems in oil injection to the fan:

1. With a sewing machine or oil, it is recommended to use four-stroke motorcycle oil, because sewing machine oil is very thin, fluidity and volatility is strong, after the oil is not used for a long time, the fan will be "relapse", and the sewing machine oil on the shock buffering effect is very small, for the weakening of noise, the role is not, The oil just avoids the above two disadvantages.

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2. After the sealing problem of oil injection, the fan oil spot affixed with a label paper, peel off the label paper after the oil, the label paper generally can not be used, what to replace it? I use four or five layers of scotch tape. To find a roll of Scotch tape, with a knife crosswise uniform knife, cut about four or five layers, and then the four or five-layer of scotch tape with paper together can be used. Note that you must not only use a layer of tape paper, because a layer of tape in the fan rotation easy vibration generated noise, there may be damage caused by oil splash. Use Scotch tape paper instead of label paper there is an advantage is the fan is not oil, a look will know, at a glance, do not take apart.