CPU风扇（CPU fan）

CPU风扇（CPU fan） CPU风扇(CPU fan) CPU fan How exactly to cool computer heatstroke? In general, we can use air-cooled, water-cooled, semiconductor refrigeration and fluorine refrigeration (nitrogen) and other methods to cool down, but because these methods achieve relatively high cost, but also may pose a threat to the security of computer, so these methods is not very popular in china. One of the most practical, convenient and popular ways to use these methods is to use fans and heat sinks. Speaking of the fan and the CPU heat sink, which in fact is the use of rapid heat transfer from the CPU to the nearby and blowing air to the cooling effect directly and CPU cooling fan, heat sink of the quality, so how to choose a suitable CPU fan has become very concerned about our topic. However, because the market is full of fake and shoddy products, if we do not understand the basic knowledge of CPU fans, then in the purchase process, it is easy to be deceived. Therefore, before we buy fans, it is necessary to understand some of the CPU fan performance parameters, once you know these identification standards, I believe that we will certainly choose a practical and suitable fan. Below, the author of the CPU fan on several major performance parameters introduced to you, we hope to be helpful. 1. fan power The fan power is a very important condition that affects the cooling effect of the fan. The larger the power, the stronger the fan's wind power is, and the better the heat dissipation is. The power of the fan and the fan speed are directly linked together, that is, the higher the fan speed, the more powerful the fan. The general computer sold on the market at present are DC 12V, power from 0.X watts to 2.X watt power range, the size you need to choose according to the CPU calorific value of yours, power theory is to choose the larger the better, because the fan speed is higher. But here I would also like to remind everyone that we can't emphasize the need for high power, with the power of the computer itself to match, if the power is too large, not only can not play a good cooling effect, but will increase the workload of the computer, thus creating a vicious circle, eventually shortened CPU fan life. Therefore, when choosing the CPU fan power size, we should follow the principle of "sufficient". 2. fan caliber The performance parameters have a direct impact on the fan output, it means that within the allowable range, the larger the diameter of the fan, then the fan's air flow is greater, the wind effect of the greater the role. Usually in the main box, the reserved position is the installation of 8cm * 8cm axial fan, if not installed in the standard position, there is no limit, then we can choose a slightly larger size of the fan. For this indicator, I want to say is to choose the fan diameter must be coordinated with the chassis structure in their computer, ensure the fan does not affect the normal work of other computer equipment, and ensure that there is sufficient free space to remove other convenient computer chassis parts. 3. fan speed The speed of the fan is closely related to the power of the fan, and the size of the rotor directly affects the power of the fan. Generally, we believe that within a certain range, the higher the fan speed, the greater the amount of air it will send to the CPU, and the cooling effect CPU will get. But when the fan speed exceeds its rated value, then the fan in overload for a long time under the work itself, will generate heat, the longer the heat generated is bigger, then the fan not only can not play a good cooling effect, but will "fire water tour"; in addition, the fan in the high speed process, may produce a very strong noise, a long time may shorten the service life of the fan; and high speed require more power to provide power source, high power source and high power from the motherboard and power supply in the, The motherboard and the power supply often cause system instability at overload power. Therefore, when we select the fan speed, it should be decided according to the heating quantity of CPU. It is better to choose the fan whose speed is between 3500 and 5200 rpm. 4. fan material Because the CPU is through the heat conduction to the heat sink, blows cold air through the fan the heat sink and put away, and the fan can heat conduction speed is determined by heat conduction plate fan material, so the material quality of the heat conductivity of the fan can play a decisive role, therefore we must pay attention in the choice of fan fan thermal conductivity of conductive sheet is good. The thermal conductivity of the material better, thermal effect is the best course is gold, gold and platinum are good, the reason why AOPEN will AX6BC motherboards with gold in Beiqiao chip heat sink, on the one hand is to show the distinguished position, on the other hand, is conducive to heat. After the gold of the thermal conductivity of metal is copper, copper metal is an excellent thermal conductivity, if used to produce copper heat sink, the cooling effect will be very good, but the copper is strong, processing difficulty is bigger, heavier, and the cost is high, so we are very difficult to see the use of copper to heat sink production. Again to copper is iron and aluminum, the two metal but very popular, but the two transverse compare, you will find that the iron is easy to rust, hard texture, easy processing, quality weight and other weaknesses, and aluminum do not have these trouble, so the aluminum will become the best production of heat sinks material. 5. fan noise Another measure of the quality of the fan is the noise size. Just imagine, if the fan bought a lot of noise, even if the fan other performance is very good, and their hearts are not practical, because too much noise will greatly affect the mood we operate the computer. Noise size is usually related to the power of the fan, usually the greater the power, the faster the speed, at this time a negative impact on the show, that is noise. Therefore, we in the purchase of the fan, we must listen to the noise of the fan, if too large, so it is best not to buy; of course, the fan noise is not always a fan of quality problems, there may be no lubrication effect to the rotating shaft of the fan, or the fan is not properly installed, if this is the case we'd better back to the fan, fan shaft positioning, or to add some lubricant to ensure good lubrication effect. Nowadays, fans have put in some designs to reduce noise, such as changing the angle of fan blades, increasing the degree of lubrication and stability of fan shafts. We use lubricating oil lubrication bearings, because the running time is not long, it is easy to cause overheating of the machine and crash phenomenon, serious when there may be burned. To this end, there are many good brand fans are beginning to use ball bearings, this kind of bearings is to use a lot of steel ball as a medium to reduce friction. This ball is a fan of large wind power, long life, low noise, but the cost is relatively high but the only high-end fan can use it, and for ordinary fan, although called "bearing", but only bearing, consisting of copper coat and steel shaft, and the ball "" but completely different bearing. In addition, I would like to emphasize here is that the fan rotation to be stable, otherwise it is very easy to produce noise, so when we buy fans, we must remember to check whether the fan roller axis is loose. 6. fan shape The fan shape we refer to usually refers to the shape of the cooling fin that makes up the fan. Due to the great influence of fan shape on the inlet and exhaust air, and an air inlet and an exhaust will be directly related to the cooling effect of the final, so in a sense, the fan shape of the working performance of the fan also has a certain impact. The plain fins is cast into the common shape, only a few more leaves "jiu" shape, The cooling effect of this fin is the most common. The heat sink is the use of high-grade aluminum mold after turning and turning the shape of a plurality of columnar bulges, the fins used on high-end graphics cards and some foreign original machine CPU (there are many foreign original machine does not use a fan, only use this heat sink). There is also a fin shaped fin that is bent over a thin sheet of aluminum. It looks like an accordion bellows. The fin heat sink works well. More is the vortex diversion fin grade, the heat sink is through die casting, heat is dense, and are inclined to a certain direction, to help the flow of air through the heat sink in the famous "turbo fan" and the original CPU cooling fan. For this measure, I suggest that you from a fan shape, size, fan blade design form and the thickness of the fan in terms of general examination, usually of different shapes of the cooling fan generated will not be too big, but in contrast, the fan size of chip heat dissipation plays a big role. 7. fan exhaust air volume Fan exhaust volume can be said to be a more comprehensive indicator, so we can say that the exhaust air volume is the most direct factor to measure the performance of a fan. If a fan can reach 5000 revolutions per minute, but if the fan blade is flat, then no air flow will be formed, so the exhaust fan of the cooling fan and the angle of fan blade are the decisive factors. A test method of exhaust fan is very easy, as long as the strength to hand on the radiator near feel the wind blowing, the fan is usually of good quality, even if we are far away from it's position, also can still feel romantic, this is a good cooling effect.