Cpu heat sink design and manufacture
CPU heat sink main body consists of heat sink and fan, because the heat sink is directly in contact with the surface of the CPU, so its heat conduction ability to a large extent affects the overall heat dissipation effect. Heat sink material on market at present is in the majority with aluminum alloy, in fact, aluminum is not the metal with best coefficient of thermal conductivity, Silver worked best, followed by copper and aluminum.
CPU heat dissipation ways are divided into two: one is passive heat dissipation, the other one is active heat dissipation.
1. Passive heat sink: The so-called passive heat sink, that is, without the use of other auxiliary materials, the heat sink carries heat away from the chip through its contact with the chip, but thanks to technological advances, computers are now equipped with increasingly complex parts, And parts of the instantaneous heat far more than before, if only passive heat sink is far from meeting the needs of the CPU.
2. Air cooling: Air cooling is currently the most common and the highest adoption rate of an active cooling method, this can solve our computer daily cooling needs, so air cooling is widely used. The internal structure of air cooled heatsink is simpler, and the price is moderate, the performance is safer. But it also exists a bit defect, which cannot be lowered below room temperature, and there is noise because the fan is turning.
3. Water cooled heatsink: The principle of water cooled heatsink is to use water to replace air and conduct heat between heat sinks through the movement of water. The water is drawn out from the water storage device by the pump, and the heat exchanger is carried out by covering the CPU with the water pipe for continuous circulation. The effect of water cooling heatsink is very good, more suitable for some computer users who often overclock.
4. Liquid cooling heatsink: Liquid cooling is the same as water cooling, and the same way. But the flow of liquid is thermal conductivity silicone oil rather than water. And the advantage of using thermal conductivity silicone oil is that it in the circulation system damage caused by the outflow of silicone oil will not lead to the damage of computer hardware.
1. Good conductivity
Gold and silver have the best thermal conductivity, but the price is too high, I believe no one will use to do heat sink, pure copper heat sink effect is second, but has been very good, is not there a lot of articles to improve the heat sink with copper to accelerate heat transfer? However, copper also has disadvantages, such as high cost, heavy weight and corrosion resistance. So most of the heat sink is lightsome solid aluminum is used to make, in that aluminum alloy should be the best heat conduction, most professional audio power amplifier of heat sink is aluminium alloy, CPU air cooled heat sink also use aluminium alloy, such as foxconn heat sink, TT turbine heat sink, etc., some of the less known and inferior brand heat sink using pure aluminum heat sink, the heat conduction effect of pure aluminum is very general, quality of a material is very light, with finger guitar sound than when aluminium alloy is ringing. However, the price is cheap. The air cooled heat sink of this kind of heat sink is easy to damage the CUP with high heat. Unfortunately, many people still use it because it is easy to come and many of them are given as gifts.To accelerate heat transfer, it is recommended to use heat conducting silicone grease. No matter how close the solids are to each other, they will leave tiny gaps, and heat will transfer slowly. Air is so heat conducting that it needs to be filled in with heat conducting silicone grease, which speeds up the transfer of heat. High quality heat conducting silicone grease does not dry out, and the heat-conducting effect is very good. Heat-conducting silicone grease is cheap, and the imported silicone grease is slightly more expensive, but it can be used for a long time.
2. Good Convection
For convection to work well, you need a cooling fan that provides enough air to ensure a constant supply of cool air.There are mainly two kinds of cooling fans in the market (bearing fans and ball fans). Bearing fans have low cost, but high noise and limited rotation speed. Ball fan has low noise, high rotation speed, but high cost. It should be known that the noise of CUP fans has gradually become a problem that cannot be ignored. At the same speed, the lower noise of ball fans is undoubtedly a big advantage. In order to allow the fan to get a higher air volume at a lower speed, the latest good fans all adopt the shape of multiple blades and sickle, which can effectively increase the air volume and reduce the noise, so it is worth giving priority. In order to accelerate convection, some heat sinks have holes in the bottom plate of the heat sinks, so that the fan's wind can blow to the part of the CUP pressed under the dissipating hot plate. This design idea is novel and practical, which is a good way for various fans to learn from. Some heat sinks have carefully designed the Angle of their fins so that the wind can take away heat more effectively.