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How to design a cooling fan to prevent noise
Release time:
2019-11-25
Ways to reduce fan noise (1) Pay attention to fan selection: For frequently used fan products, the faster the speed, the better the fan's heat dissipation capacity, and the greater the noise. When we buy, we can put the fan next to our ears to listen. If we can clearly hear the noise of the fan, we recommend not to buy such a product. In addition, under normal circumstances, a fan with a relatively large diagonal length is worth buying, because in order to achieve the same heat dissipation effect, the speed of the large fan must be lower than the speed of the small fan, so the noise is relatively small (2) Strengthen the "lubrication" of the fan" . Due to low oil prices.
How to DesignCooling fanHow to Prevent Noise
1, Cooling fan noise formation principle:
Cooling fan noise formation? The central shaft part of the fan includes the shaft and the bearing. The total mass center of the fan has a certain deviation angle from the central axis. At first, the fan has the lubricating effect of oil, but after long-term use, the fan will vibrate up and down when rotating at high speed, causing noise.
In addition, as the use time increases, the friction between the shaft and the bearing will inevitably cause vibration, which will also cause noise. The higher the frequency, the stronger the performance of the accessories we use, and the higher the speed, the greater the fan noise we need to use.
The cooling fan is the main component of the air-cooled cooling system, and it is also the key to determine its heat dissipation effect. However, the quality of the fan depends mainly on the type of bearing used. Of course, fan speed and blade characteristics (diameter, weight, cutting angle, shape, etc.).) )) At present, fans can be divided into axial flow fans and turbo fans according to the rotating shaft and outlet direction of the fans. Turbofan engines are also known as centrifugal fans. It uses centrifugal force to make air flow along the radial direction of the blade to dissipate heat. This product is mainly used for hard drives and CPU radiators, which are rare in the market. Axial fans are the most common mainstream products on the market. Its fan blades are usually directly connected to the lift of the fan blades on the motor to cause the air to flow axially to dissipate heat.
2 Ways to Reduce Fan Noise
(1) Pay attention to fan selection:
For frequently used fan products, the faster the speed, the better the fan's heat dissipation capacity, and the greater the noise. When we buy, we can put the fan next to our ears to listen. If we can clearly hear the noise of the fan, we recommend not to buy such a product. In addition, under normal circumstances, a fan with a relatively large diagonal length is worth buying, because in order to achieve the same heat dissipation effect, the speed of the large fan must be lower than the speed of the small fan, so the noise is relatively small
(2) Strengthen the "lubrication" of the fan"
. Due to the low oil price cooling fan, most computers use motor cooling fan with oil bearing, which needs to be refueled after a period of use. Otherwise, the friction coefficient will increase greatly, resulting in quite "noisy" noise and chassis resonance
The method of filling the fan motor is very simple: remove the cooling fan from the radiator and then tear off the sealant paper on the back of the fan. At this time, we can see the oil injection hole in the center of the fan. After dripping a few drops of lubricating oil (sewing machine lubricating oil can be used) into the oil filling hole, the fan can be filled with sealant paper
(3) "Slow down" to reduce noise:
By reducing the fan speed, the noise intensity can be effectively reduced or even fundamentally eliminated. There are currently on the marketCooling fanManual and automatic speed regulator. The automatic regulator can automatically adjust the speed of the fan (with heat probe) according to the temperature of the CPU radiator. After installation, there is no need to open the chassis again. However, the manual speed regulator usually only has normal, medium and low gears, and the chassis needs to be opened every time the manual speed regulator is executed.
(4) Use the "replace" radiator:
The so-called replacement radiator refers to replacing the traditional "air-cooled" radiator with a large area radiator, heat pipe, water-cooled radiator, etc.
Super-area radiator: Replace the air-cooled radiator with a super-area radiator. Since the noise cooling fan is eliminated, we must use a radiator several times larger than the previous radiator to dissipate heat.
2) Heat pipe radiator:
The heat pipe makes full use of the physical principle that water and gas continuously absorb and release heat due to state conversion to transfer heat. Excellent thermal conductivity can transfer heat from the bottom of the heat pipe to the top of the heat pipe at an extremely fast speed. This excellent thermal conductivity can prevent heat from accumulating in the heating member, and distribute the heat evenly to each heat sink of the heat sink. Due to its good thermal conductivity, only a little air convection is required for the entire heat sink.
3) Water cooling circulation device:
The water cooling device adopts water circulation to dissipate heat. We often see many DIYer experts using water cooling equipment in overclocking tests. However, since there are still fans in the entire system, there is still some noise. In addition, water cooling is not commonly used because adequate protection must be taken to prevent water leakage. At the same time, the cost of the water-cooled radiator is not low and the installation is complicated. Although the heat dissipation effect is first-class, it is not suitable for primary users.
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