What about the sound of a laptop fan?

Many of my friends reacted to their computer noise too much. In fact, the biggest culprit is the CPU fan. Generally speaking, newly-bought fans are always less noisy and will become significantly larger after a period of time. In fact, dust is one of the main causes of fan noise rise, because the pervasive dust can always be drilled into the not completely airtight chassis. When the CPU fan rotates at high speed, the vortex effect makes the dust easily attached to the fan. There is no doubt that at this time the CPU fan is removed to clean up a lot of it is necessary, and in the dust removal, we should pay attention to the fan back and the heat sink, here is the most easily forgotten.

For oil bearing fans, it is common for motor shafts to become inflexible after long hours of work. To this end, we recommend that you add lubricants in this position, recommend mechanical lubricants or gasoline engine oil. Of course, you must be careful when adding lubricating oil, never let it overflow.

In addition, the vibration problem is also need our attention, usually high-speed rotating fans with the heat sink high-frequency collision, if the fan and heatsink then stable, the impact of the vibration noise can be greatly reduced. For example, the high-speed rotating CPU fan held in the hand, the noise is far less than fixed on the heatsink, this is because the soft hands absorb a lot of vibration. By this principle, the noise generated by the vibration of the fan and heatsink can be effectively reduced by adding a 1~2 mm thick cushion piece (such as leather, rubber) between the fan corners and the heatsink contact surface.

In the summer, many users will choose to stop overclocking, and at this time the high-power fan is obviously unnecessary. The main reason that makes the fan sound too large is its extremely high speed. If we reduce the speed of the fan, the noise problem will be further alleviated. In fact, even if the CPU fan we use does not adjust the speed, we can make up for it through a dedicated fan governor. Zalman company introduced the FANMATE1 fan governor in the domestic market is very popular, Kyushu has similar products. This type of fan governor is very simple to use, we only need to plug the CPU fan power interface to the fan governor, and then the fan governor connected to the motherboard on the CPU fan power interface.

As for the user with strong hands-on ability, we can try to reduce the working voltage by a series of resistors. As for the use of resistance, you can use the CPU fan on the nameplate to calculate (remember p=ui,r=u/i can), and at this time we can get any voltage. Finally, to remind everyone to reduce the CPU fan speed, must be in the BIOS to open the appropriate temperature monitoring function to ensure safety. Of course, at this time can be the alarm temperature and shutdown temperature set higher.

Method of eliminating CPU fan noise two

CPU fan bearings and blades are the most likely to cause noise, long after the use of the fan bearings may be due to the lack of oil and friction too much, resulting in greater noise.

Solution: You can add oil to the fan shaft. The specific operation is the fan shaft on the label carefully uncovered, add oil and then cover.

If the fan blade quality is not very good, after a period of rotation, the fan blades may be due to heat and deformation, touch the inner wall, emitting noise.

Solution: Take the blade in the scratch place gently scraping a few, increase the distance between the fan and the inner wall, avoid both friction.

As we all know, the computer noise mainly from the fan, many materials are introduced to the fan oil to reduce noise, but I think the fan noise is not necessarily due to the lack of oil bearings.

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 install the fan as firmly as possible, make it vibrate, of course, this method does not solve the real problem, because the fan blade is still "eccentric", another way is to the fan bearing at the oil, the vibration of the buffer, thereby weakening the noise; There is also a way to fundamentally solve the problem: remove the blades, with a thin line through the center of the fan blade to lift the blade, if one end of the drop, indicating that the end is heavier, can be grinding a few times on the grinding wheel, so several, and then use a thin line to hoist the fan blades, if the fan blades can be static at the horizontal position, the success