The development history of bearing sealing technology

Development history of bearing sealing technology Corresponding sealing devices are installed on both ends of the newly developed rolling bearings. Its function is to keep the grease (oil) inside the bearing from being lost during use and to ensure that the bearing is in a lubricated state. On the other hand, it is to protect the outside of the bearing from dust or harmful gases from the seal factory from entering the inner cavity of the bearing. To prevent damage to the bearing. The common ones are rubber or engineering plastic sealing rings, as well as steel plate stamped sealing rings (or dust caps). The sealing structure of the sealing ring is various, and the sealing effect is also different. If there is a gap between the sealing ring and the rotating shaft, it is called a non-contact seal. The smaller the gap, the better the sealing effect, but the lower the rotation speed of the shaft is allowed; the opposite is true. There is no gap between the seal ring and the rotating shaft, which is called contact seal. The larger the contact area of u200bu200bthe seal ring contact lip, the better the sealing effect, but the lower the rotation speed of the shaft is allowed, and vice versa. The main research content of sealing technology is the research and development of corresponding sealing devices used in different working conditions, as well as the compatibility of the sealing ring material and the corresponding grease. The choice to install the sealing device based on the bearing has been a matter of the mechanical seal factory for more than 4 years. In the past, the bearings were all open. In order to ensure the lubrication and dust prevention of the bearing, the sealing device was installed on the shaft at both ends of the bearing. With the development of industry, especially the food industry, the popularization of modern office machinery and home appliances, it is required to have compact equipment design, reduce the weight of mechanical seals for pumps, and prevent water and air leakage. This leads to the emergence of bearings with sealing devices. First of all, it is widely used in deep groove bearings with a large volume and a wide range. In recent years, various types of rolling bearings have bearings with different sealing rings. Bearing sealing is one of the important directions for the development of bearing technology. A quarter of the seals have been installed, and there will be 2-3 bearing structures every year in the next ten years, and 20-30 million sets of bearings will develop into sealed bearings. Bearings of different structures and different working conditions require different structures and materials of the sealing ring, so the research and development workload is very large. Development trends at home and abroad Several major bearing companies in Japan (Seiko, Toyo, Fujitsu, etc.) represent the direction of bearing sealing technology development. They have an earlier history in the development of sealed bearing device technology, and their research depth is large. At present, the sealing technology is relatively mature. It has developed from single sealing lip to multiple sealing lip, and non-contact sealing has been developed from contact sealing. In terms of product type, both ball bearings and roller bearings are available. Following the international development trend, my country has also developed deep groove ball bearings with sealing rings, water pump bearings, railway (tapered roller) bearings, needle roller bearings and short element cylindrical roller bearings, including deep groove ball bearings. The largest output and the widest application. According to the results of the quality inspection of my country's sealed bearings by the National Bureau of Technology recently, my country's sealed bearing structure design has a large problem, the sealing effect is not good, and the grease leakage is more serious, and users have responded strongly. After analysis, the main reason is that my country's current seal ring design structure is unreasonable, the inner ring does not have a seal groove, and the manufacturing accuracy is not high. Therefore, the future development trend of my country's bearing sealing technology is: Taking deep groove ball bearings as the representative, carry out sealing technology tests, find the best seal ring structure and best seal life, carry out research on sealing materials, look for wear resistance, aging resistance, and durability. High-temperature and corrosion-resistant materials lay the technical foundation for improving the life of contact seals and developing seals that work under high temperature conditions or under harmful atmosphere conditions. Main research content and objectives According to the current status of low quality of sealed bearings in my country, the main research content in the future is: first, research and test, and screen out the seal ring structure of deep groove ball bearings and develop the corresponding bearing inner ring seal groove structure, and carry out the current deep Renewal of groove ball bearing seal structure. Strive to make the sealing performance of this type of bearing catch up with the international advanced level of similar products in the late 1990s in 2005; secondly, in conjunction with the development of my country's car industry, develop high-temperature sealed bearings suitable for long-term work at a high temperature of 120-180℃; Third, a new seal structure for tapered cylindrical roller bearing series is developed on behalf of railway vehicle bearings. Key words: seal factory, mechanical seal factory, pump mechanical seal