Introduction of cooling fan bearing system

The cooling fan is realized by energy conversion, namely: electric energy → electromagnetic energy → mechanical energy → kinetic energy. The circuit principle is generally divided into various forms, and the performance of the fan will be different if the circuit used is different, and the speed is also one of the reasons that affect its energy conversion.

　　 Cooling fan speed:

　　 Rotation speed refers to the speed at which the fan rotates, usually measured by the number of revolutions in 1 minute, namely: rpm. The speed is related to the number of turns of the electromechanical winding, the wire diameter, the outer diameter and bottom diameter of the fan blade impeller, the shape of the blade and the bearing used, etc. The increase in the speed increases the air volume correspondingly.

The speed value represents the air volume to a certain extent. Under certain conditions, the higher the speed, the greater the noise and vibration. Therefore, when the air volume meets the heat dissipation requirements, a low-speed fan should be used as much as possible . Next, Ruianpu cooling fan manufacturer will take you to understand the cooling fan bearing system.

　　Fan bearing system:

　　The bearing system of the fan generally recommends the best choice of ball bearings, because the life of the fan heater usually depends on the reliability of its bearings, and the ball bearing system has been proven to have the characteristics of high efficiency and low heat generation. Ball bearings are rolling friction, rolling by metal balls, with a small contact surface and a small friction coefficient; while oil-impregnated bearings have 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 louder , Short life. In addition to the large ventilation and high wind pressure, the reliability of a good-quality fan is also very important. The type of bearing used by the fan is very important here.

　　 High-speed fans always use ball bearings (Ballbearing) while low-speed fans use low-cost oil bearings (Sleevebearing). Oil-impregnated bearing fans only use one bearing; while ball-bearing fans all need two bearings, a single ball bearing is "1Ball+1Sleeve", which still has an oil-impregnated bearing. More advanced than single ball is double ball bearing, namely TwoBalls. The life of oil-impregnated bearings is generally 10,000 hours, single-ball bearings are 30,000 hours, and double-ball bearings are more than 50,000 hours (when the ambient temperature is set below 25℃). Lubricating oil is needed to reduce the sliding friction. The lubricating oil is made of lithium-based grease and special engine oil. With long-term operation, the oil in the bearing will evaporate and become dry, the friction coefficient will increase, the fan operation will be affected, abnormal noise may appear, the speed will be slow or even no rotation. The ball bearing replaces sliding friction by rolling friction, has a small friction coefficient and overcomes the shortcomings that the friction coefficient is easy to change, so it has strong running stability and a relatively long life.