Oil-bearing is a sleeve bearing with sliding friction. As a lubricant and drag reducer, lubricating oil has low running noise and low manufacturing cost in initial use. However, this kind of bearing is badly worn and its service life is far from that of ball bearing. Moreover, after the bearing is used for a long time, due to the oil seal (it is impossible to use high-grade oil seal for computer radiator products, usually ordinary paper oil seal), the lubricating oil will gradually evaporate, and dust will also enter the bearing, thus causing problems such as slow fan speed and increased noise, and bearing wear will lead to serious vibration of the eccentric fan. When these phenomena occur, either open the oil seal to refuel, or only eliminate it and buy a new fan.
Ball bearings change the friction mode of bearings and adopt rolling friction, which effectively reduces the friction phenomenon between bearing surfaces, effectively prolongs the service life of fan bearings and therefore prolongs the service life of radiators. The disadvantage is that the process is more complicated, resulting in higher cost and higher working noise.
Bearing form refers to the bearing type used by air-cooled radiator fan. In mechanical engineering, there are many kinds of bearings, but there are only three kinds of bearing forms used in radiator products according to their basic working principles: sleeve bearing with sliding friction, ball bearing with rolling friction and the mixture of the two bearing forms. In recent years, the new bearing technologies introduced by major radiator manufacturers, such as magnetic bearing, fluid protection system bearing, hydraulic bearing, Frye bearing and nano-ceramic bearing, are also improved on the basis of the above basic bearing forms, and the basic working principle has not changed.
Sleeve bearing is a sliding friction sleeve bearing. As a lubricant and drag reducer, lubricating oil has low running noise and low manufacturing cost in initial use. However, this kind of bearing is badly worn and its service life is far from that of ball bearing. Moreover, after the bearing is used for a long time, due to the oil seal (it is impossible to use high-grade oil seal for computer radiator products, usually ordinary paper oil seal), the lubricating oil will gradually evaporate, and dust will also enter the bearing, thus causing problems such as slow fan speed and increased noise, and bearing wear will lead to serious vibration of the eccentric fan. When these phenomena occur, either open the oil seal to refuel, or only eliminate it and buy a new fan.
Single ball bearing (1 ball+1 ball bearing) is an improvement of traditional oil-bearing and adopts a mixed form of sliding friction and rolling friction. In fact, it uses a ball bearing and an oil-bearing to reduce the cost of double ball bearings. Rotor and stator are lubricated with balls and equipped with lubricating oil. It overcomes the shortcomings of short service life and unstable operation of oil-bearing and the cost increase is extremely limited. Single ball bearing absorbs the advantages of oil-bearing and double ball bearing, and improves the service life of bearing to 40000 hours. The disadvantage is that the running noise increases after adding the ball, but it is still less than that of the double ball bearing.
Two ball bearings are relatively high-grade bearings. They exist in the form of rolling friction. There are several small steel balls around the axis of the bearing. When the fan or shaft rotates, the steel ball also rotates. Because they are all spheres, the friction is small, and there is no problem of oil leakage. The advantage of double ball bearings is long service life, about 50000- 100000 hours. Good anti-aging performance, suitable for high-speed running fans. The disadvantage of double ball bearings is high manufacturing cost and the maximum noise at the same speed level. Double ball bearings and hydraulic bearings have good sealing performance, especially double ball bearings. Double ball bearings are completely embedded in the fan, and the rotating parts are not in direct contact with the outside world. In a sealed environment, the working environment of the bearing is relatively stable. Therefore, almost all 5000 rpm large-caliber fans use double ball bearings.
The representative manufacturer of rifle bearing technology is CoolerMaster. At present, CoolerMaster has upgraded most traditional oil-bearing fans to rifle bearings. As an improvement of traditional oil-bearing, Frye bearing is made of wear-resistant materials, which reduces the friction between bearing and shaft core. Frye bearing also has a shaft core with reverse spiral groove and oil retaining groove. When the fan runs, it will form reverse deviation to avoid oil loss and prolong the bearing life. By adopting the above structure and components, the Frye bearing fan greatly improves the bearing and oil retaining capacity and reduces the noise.
Hypro bearing, whose name comes from HY (Hydrodynamic Wave) pro (Oil Protection System), is a patented product of ADDA, a well-known radiator and fan manufacturer, and is also made by many improvements on the basis of traditional oil-bearing Fluid protection system bearings and hydraulic bearings can be described as the same goal. Both designs adopt some unique improvement measures, but they are essentially circulating oil systems, and their performances are basically the same in all aspects. Usually, the product life can reach more than 50,000 hours.
Hydraulic bearing is a technology pioneered by AVC, which is improved on the basis of oil-bearing Hydraulic bearings have more oil storage space than oil-bearing bearings, and have a unique loop-back oil supply circuit. The working noise of the hydraulic bearing fan is obviously reduced, and its service life is very long, reaching 40,000 hours. Hydraulic bearings are essentially oil-bearing bearings. However, after improvement, the life of this kind of oil-sealed bearing is much longer than that of ordinary oil-sealed bearing, and it inherits the advantages of oil-filled bearing-low running noise. At present, hydraulic bearings have been applied to AVC radiators, but not all AVC radiators use hydraulic bearing fans.
The VAPO bearing is improved by Sunon's magnetic levitation technology, that is, the hardness of the sleeve of the oil-bearing is strengthened, and the inner surface of the sleeve is specially treated, which overcomes the shortcoming that the oil-bearing is not resistant to high temperature. With the magnetic levitation technology, the service life is greatly prolonged.
The motor of magnetic bearing has a magnetic system (MS) design, and its magnetic induction line is perpendicular to the magnetic levitation line, so the shaft core is parallel to the magnetic levitation line, so the weight of the rotor is fixed on the running track, and the almost empty shaft core is propped up in the direction of the anti-magnetic levitation line, forming the whole rotor suspended on the fixed running track. Therefore, magnetic levitation is actually only an auxiliary function, not an independent bearing form. The specific application must be matched with other bearing forms, such as magnetic suspension+ball bearing, magnetic suspension+oil bearing, magnetic suspension+vaporization bearing and so on. This technology has not been recognized by European and American countries.
Nano-ceramic bearing (NCB) is essentially oil-bearing and was first introduced by Foxconn in its products. The traditional oil-containing fan is seriously worn in use and has low reliability in long-term use. Nano-bearing effectively overcomes this problem: ceramic bearing technology fully integrates special polymer materials with special additives, and the bearing core is made of special Hao-2 material by stamping die and sintering process, and the grain size is reduced from 60μ m to 0.3μ m in the past, which has the characteristics of firmness, smoothness and wear resistance. Nano-ceramic bearing has strong high temperature resistance and non-volatilization, which greatly prolongs the service life of the fan. The properties of nano bearings are similar to ceramics, and the more they are ground, the smoother they become. According to the test, the average service life of fans with nano-ceramic bearings is more than 654.38+0.5 million hours. This technology is not a real nano-technology, and the materials used are not real nano-materials, but the word nano is used to attract people's attention.