The length of life of cooling fans usually depends on the reliability of their bearings. So how to choose the cooling fan fan bearing system?
The best fan bearing system for cooling fans is double ball, ball bearings. The reasons are:
1. Ball bearing system features high efficiency and low heat generation.
2. Because the metal ball is rolling, the ball bearing is rolling to generate friction, so the contact surface between them is small, and the friction coefficient is also small;
3. Other bearings such as: oil bearing is sliding friction, the contact surface is naturally much larger, after long-term use, the oil will volatilize, the bearing is easy to wear, the friction coefficient is large, late noise, short life. Good fan reliability is very important, and the type of bearing used by the fan is also very important.
4. Ball bearings are used for high speed fans and Sleeve bearings are used for low speed fans. Oil-bearing fans use only one bearing; ball-bearing fans require two bearings, single-ball bearings, which are “1 Ball + 1 Sleeve” and still contain oil bearing components. More advanced than single ball is double ball bearing, ie Two Balls. Oil bearing life is generally 10,000 hours, single ball bearing is 30,000 hours, and double ball bearing is 50,000 hours or more (when the ambient temperature is set below 25°C).
5. The oil-retaining fan used in the cooling fan is sintered from a copper-based powder. The use of the oil-filled bearing requires lubrication to reduce the number of sliding friction. The lubricating oil is made from a lithium-based grease plus a special oil. With prolonged operation, the oil in the bearing will evaporate and dry out, the friction coefficient will increase, the operation of the cooling fan will be affected, abnormal noise may occur, and the rotation speed will be slow or even not turn. The ball bearing replaces the sliding friction by rolling friction. The friction coefficient is small and overcomes the disadvantage that the friction coefficient is easily changed. Therefore, the running stability is strong and the service life is relatively long.
So choose the cooling ball bearing system to choose double ball ball bearings. It has advantages over other bearings in use.
