[Cooling fan] Which cooling fan is the best cooling fan and how to choose
Cooling fan
Cooling fans are widely used in life and industry. Cooling fans refer to reducing the generation of indoor heat energy when using electrical appliances. However, there are various cooling fans in the market, and many consumers do not know how to choose. Let’s take a look at how to choose a cooling fan.
The principle of cooling fan
The working principle of cooling fan is realized according to energy conversion, namely: electric energy→electromagnetic energy→mechanical energy→kinetic energy. Its circuit principle is generally divided into various forms, and the performance of the fan will be different depending on the circuit used.
How to choose a cooling fan
Speed: Generally speaking, it can be said that the size of the speed determines the air volume of the cooling fan. The noise and vibration will definitely increase. Therefore, when the air volume is sufficient for the heat dissipation of the product, a low-speed fan should be used as much as possible. high speed. If it is a PWM speed-regulated fan, it can be tested by the monitoring software that comes with the motherboard, or by the tachometer.
Bearing: The bearing of the cooling fan has been mentioned in many issues before. Now more and more cooling fan manufacturers do not use oil-impregnated bearings, unless it is a very small cooling fan, which cannot use bearings. It will be used because the service life of the oil-impregnated bearing is too short and the noise in the later stage is too large, which cannot be compared with the roller bearing. Ball bearing systems have proven high efficiency and low heat build-up. Ball bearings are rolling friction, rolling by metal balls, with a small contact surface and a small friction coefficient; while oil-impregnated bearings are sliding friction, with a large contact surface. After long-term use, the oil will volatilize, the bearing is easy to wear, the friction coefficient is large, and the later noise is large. , short lifespan. In addition to the large ventilation volume and high wind pressure, the reliability of a good-quality fan is also very important. The bearing form used by the fan is very important here. The oil-impregnated bearing used in the fan is sintered from copper-based powder. The oil-impregnated bearing needs to be lubricated to reduce the sliding friction. The lubricating oil is prepared from lithium-based grease and special oil. With long-term operation, the oil in the bearing will volatilize and dry out, the friction coefficient will increase, the operation of the fan will be affected, abnormal noise may occur, and the speed may be slow or even not rotating. The ball bearing replaces the sliding friction by rolling friction, and the friction coefficient is small and overcomes the shortcomings of the easy change of the friction coefficient, so the operation stability is strong and the service life is relatively much longer.
There are all kinds of cooling fans on the market, and there are two most important points in the selection of cooling fans: speed and bearing. When choosing a cooling fan, we must see these two points and Indicators, to understand the performance and advantages, in order to choose a satisfactory cooling fan.
