In the process of using cooling fans in the home appliance industry, the reliability of the fan bearing system software determines the service life, noise and reliability of the heat pipe cooling fans. Generally, the cooling fan bearings in the home appliance industry can be divided into two types: oil-impregnated and ball bearing fans. The price of oil-impregnated fans is lower, but oil-impregnated bearings are drag friction and have a larger surface. In the long-term use process, the lubricating oil is used faster, so the bearing is more likely to be damaged, the noise is large in the middle and later stages, and the cycle is short. The ball bearing is a flip friction, which has the characteristics of high efficiency, low heat generation, small friction coefficient and small damage. Therefore, the service life is generally up to 40,000 hours. With the continuous expansion of heating capacity in the home appliance industry, oil-containing fans have long been unable to consider the cooling requirements of the home appliance industry. Ball fans have gradually become cooling fans in today's home appliance industry.
During the production and processing of bearings, the key stages that endanger their quality include the production and manufacture of bearing steel balls, the use of refined oil, cleaning during processing, the application of aerospace-grade stainless steel plates, and high-precision assembly lines. For fan micro-motor bearings, the bearings produced in China at this stage are limited to technical reasons and cannot meet the quality requirements of high-speed operation and excellent performance of fans. After use, the properties of the cargo at all levels are not satisfactory. There are even some illegal manufacturers in China, who usually use discarded bearings for their manufacture. Its price and features are as bad as a ball fan, seriously undermining the rights of many consumers.
In addition, the appearance of high-quality bearings and counterfeit bearings are not very different, but their technological content cannot be compared. Based on the analysis of bearing preload characteristics, Chinese manufacturers and international famous brands can best reflect the significant technical differences in the production process. Preloading refers to the entire process of securing the balls into the bearing sleeve, and it stipulates that the balls are inseparable from the bearing sleeve surface and have no play to minimize damage to the rigid bead. Usually, in the manufacture of bearings by Chinese manufacturers, the left and right bearing sleeves are directly aligned before preloading. There is no doubt that there will be some deviation between the steel ball specification and the bearing sleeve specification, so after preloading the bracket, there is always 5-10 gaps in the middle of the ball coaxial bearing sleeve, and the M gap is this gap, which is It greatly increases the degree of embrittlement damage and reduces the service life of the bearing. In the same whole process, in the production and manufacture of imported bearings, the relative spacing between the left and right bearing sleeves during preloading is 5 microns, so that the bearing sleeves will firmly clamp the balls after being stressed, thereby reducing the gap to zero. During the operation of the fan, the balls are not easy to vibrate, thus minimizing damage and ensuring the smooth and long-term high-speed operation of the cooling fan.
