Why does a computer case have 3 fans

The main function is heat dissipation. The three you mentioned should be one power supply, which dissipates heat from the power supply, and at the same time forms a heat dissipation system with the heat dissipation holes on the chassis to help adjust the air circulation of the case. The second should be a fan on the CPU, the third should be the fan that comes with the graphics card, and if it is an integrated graphics card, it should be a case fan.

CPU and graphics card work is to generate a lot of heat, and the high-temperature working environment is easy to cause rapid aging of electrical appliances and reduce the service life. The case fan is designed to help quickly remove the heat generated in the case.

Let me add a few words, why have fans? Yes, the general computer has more than 2 fans, such as CPU fans, power fans, some computer graphics cards also have graphics card fans, host fans, etc., the computer must have a stable point power source - power supply, the role of the computer power supply is actually a stabilized power supply, the power supply fan is to play a role in heat dissipation, because in the power supply is still a transformer, 220V in, divided into 3V 6V 12V 36V and so on, so in this process to generate a lot of heat, If you don't heat dissipate heat in time, it will be abnormal or even not work, only if the heat is dissipated so that the power supply can work stably, so that your computer can run normally, not to mention the CPU fan, all the data processing of our computer is carried out by the CPU, its speed is amazing, so a lot of heat will be generated during the period, if you don't dissipate heat and heat in time so that the CPU will not work or even burn out, in fact, there is just a fan, you can't feel it, especially in winter, if it is in summerIf the fan doesn't rotate, it won't take more time to crash. The same goes for graphics cards, now with the birth of online games such as 3D, the requirements for graphics cards are getting higher and higher, so now many good graphics cards are equipped with fans, once this fan is faulty, it will also cause the computer to crash, it can be seen that the role of the fan is not general, it is very important not to underestimate it Oh, thank you, I hope what I said can help you.

Generally, 2 fans are used to form an air duct.

A convulsion, intake.

An exhaust, an outlet.

Too many fans don't do much more, they create extra noise.

First: When purchasing a chassis cooling fan, you must first determine the model and appearance you want, and then determine the voltage, bearing, cable length, air volume, speed, current, noise, etc. Generally, the material of the box is aluminum and gold, and the leaves are made of PBT.

When purchasing DC fans, the materials of the frame and blades are generally made of PBT.

Second: get the cooling fan first look at the voltage on its trademark, (AC voltage can be divided into 110V, 220V, 380V.) DC voltage can be divided into 5V, 12V, 24V, 48V.

Avoid the wrong voltage to burn the cooling fan, causing adverse effects on the chassis and cabinets.

Third: look at the bearing on the trademark is a ball or oil-contained, the ball is the logo of HB, the oil is the symbol of HS, the ball has a life of 3-50,000 hours, and the oil content is only 1-30,000 hours of life. Fourth:

The power cord is also very important, if the power cord has peeling skin or copper wire exposed in the place where it is not welded, then do not use it, it will cause injury to people, and if the consequences are serious, it will be electrocuted.

Fifth: Look at the *** of a cooling fan, or look at the copper wire and stator of the cooling fan.

Copper wire has pure copper wire, aluminum-clad copper, and even iron-clad copper, and the stator is also divided into pure steel and steel belt) The quality of copper wire and stator directly affects the life of the cooling fan, and a good copper wire and stator can increase the speed. If you use poor copper wire and electronics, it will directly affect the service time of the chassis and cabinet.

Sixth: The general cooling fan is used at a temperature of minus 20-80 degrees Celsius, and the humidity is between 20% and 85%. Beyond that, you can choose a cooling fan with aluminum and gold blades.

Seventh: If there is a sound in the operation of the cooling fan, the oil-impregnated bearing may be caused by the lack of oil or the displacement of the stator inside the fan, and the ball bearing may not be good, or the ball cover falls off, or the stator inside the fan is displaced.

Eighth: The cooling fan suddenly does not rotate during operation, most likely the fan blades.

It has been burned, it is also possible that the voltage is connected to the wrong (110V will turn at the beginning of the 220V connection, and it will not turn after 10-30 minutes), or it may be that the copper wire inside the cooling fan is broken, or the power cord may fall off.

That must be the graphics card, a CPU, a power supply, just three fans, and then the high-end ones have a chassis that comes with four fans for one person.

Usually the fans that must be configured in the computer case are: power supply fan, CPU fan, graphics card fan, and if the heat of the case is relatively large, an exhaust fan will be installed on the side cover.

The case fan is suitable for two

Ordinary fans, after the external force stops, there is still a strong current, at this time the heat is huge, easy to burn out the motor; The fan with self-starting function, due to its special IC design, has a current of 0 after stopping, and can re-rotate after the external force is removed; In addition, at the same speed, the working current of the fan with the self-start function is only half of that of ordinary fans, and the power consumption is extremely low. These two special functions prevent the product from overheating greatly extend the service life of the fan and improve the cost performance of the product.

When used to dissipate heat from the chassis: Hot air can be discharged along the rear panel of the chassis, allowing cold air to flow into the chassis from the lower part of the front panel. It forms a continuous convection environment in the machine and reduces the ambient temperature in the chassis, so as to effectively achieve heat dissipation of auxiliary CPU, graphics card and other heating components.

When used for power supply heat dissipation: In addition to removing heat from the components in the power supply, it can also assist in dissipating hot air flow in the chassis.

There are usually 3 fans in the case of the computer. One fan on the CPU, one fan on the graphics card, and one fan on the power supply.

If the general performance of the graphics card without a fan is very low, the case fan can be added by itself. CPU fans and heat sinks, in fact, use banquet and them to quickly conduct the heat of the CPU and blow it into the nearby air, and the quality of the cooling effect is directly related to the quality of the CPU cooling fan and heat sink.

The main performance of the fan is reflected in the following aspects: speed, fan blade shape, fan blade angle and bearing system.

In general, the speed of the fan is indicated on the manual of the radiator. The heat dissipation efficiency of the radiator is 30% dependent on the speed of the fan. But the higher the fan, the better.

The correct fan speed should be determined according to the heat generation of the CPU, and the speed selection of fans of different specifications should be differentiated, the basic principle is: under the premise of generating the same air volume, the larger the fan speed, the lower the speed, and the noise will also be smaller, generally between 3500 rpm and 5200 rpm is more conventional.

The fan behind the case should be used for exhausting air outward, and the front fan should blow air into the case, and the fan at the back should be exhausting outward, so that the air can be convection, effectively cool down, and there will be no abnormal noise.

Installation process.

1. Generally, the case fan is installed in the front of the case, which draws cold air from the front and blows it to the top of the motherboard, and finally discharges it by the power supply fan to form convection. It is best to consider the direction of air flow, and the best solution is to install a fan in the front and rear, distributed diagonally, and then the whole case will have a good cooling effect. The front fan of the case blows on the inside, and the rear fan blows on the outside.

2. Generally, there are two places where fans can be installed in the case, the front one is generally at the hard disk bracket, and the rear one is generally under the power supply and above the keyboard port. The higher-priced case is already equipped with 1 or 2 fans from the factory. When installing a case fan, the principle of air flow should be followed.

If the installed fan goes forward and exits, the internal air path of the chassis is very regular from front to back; If the fan installation is reversed, the rear in and the front out or the rear in and forward, because the power supply fan is also out, it will cause chaos in the air path.

Discern the direction of the wind

1. The indoor ambient temperature is 23 degrees, and the result is that the temperature of the air supply and exhaust box is 35 degrees, but the CPU temperature is 61 degrees when the air is supplied and only 56 degrees when the air is pumped, which is an amazing difference of 5 degrees.

2. Analyze the reasons for this situation, mainly because the high-temperature air above the MOSFET tube in the power supply area of the motherboard is brought to the CPU area, and then sucked in by the CPU fan, which leads to the high CPU temperature. When the air is replaced, the hot air above the MOSFET tube flows directly to the outside of the chassis and does not pass above the CPU area.

In addition to the default fan of the CPU and graphics card, the desktop generally adds a fan in the front and rear of the case, with air intake in the front and exhaust air in the back to form an air duct. Seeing that some players got five or six fans, that was too exaggerated and only added to the noise.

If the performance is not very high, it is okay not to need a case fan directly.

If it is a mainstream configuration, the tower CPU is air-cooled, and there are also new independent graphics, which can be installed with an internal air front, biased downwards behind the graphics card, allowing it to assist in air supply. A rear air outlet, this is basically a must. If there is a fan position on the chassis, there are wind and dust measures at this position, which can be installed with air intake, and increasing the air pressure in the upper part is also conducive to heat dissipation.

However, if there are not many holes in the case, this position will have to be reversed or not installed.

You can pack as many as you want, as long as you want. Generally, in addition to the CPU and graphics card fan, at most 1 or 2 are installed.

Generally, the front panel is equipped with an air intake, and the side panel is equipped with an air intake, which is specially designed to blow the CPU, and then the panel is equipped with an air outlet, so that it can become an air outlet channel, forward air, and rear air outlet. Generally, use three.