With the rapid development of science and the continuous emergence of new materials, the technology of mechanical seal has been further developed. The promotion and application of new technology of mechanical seal aims at reducing product leakage and environmental pollution, while extending the service life of mechanical seal device. In summary, the new technology of end face mechanical seal mainly includes the following three types:
1. Split mechanical seal technology
One end of the split mechanical seal is a connection sealing cavity with a special shape groove inside. At the other end, the corresponding position is a joint with a similar shape boss at the front end and a connecting groove at the rear. The two part of the joint is made up of the structure with ring arc protrusion, and the joint is pressed into the sealing cavity when installing, so as to achieve the purpose of sealing, and change with the pressure changes, the performance of sealing, reliability and durability has more stringent requirements. It is because the non-contact mechanical seal technology has better sealing and durability, so it has a certain advantage in the application of mechanical seal technology in petrochemical industry.
The basic principle of the mechanical seal technology with return structures is to transfer the flow path of the fluid and send it back to the mechanical seal cavity, so as to achieve the ultimate goal of the zero leakage of the mechanical equipment. Moreover, the mechanical seal technology with return structures has the advantages of convenient maintenance, strong applicability and simple structure. It is especially suitable for all kinds of special conditions with high parameters, such as high temperature, high speed, high voltage and so on.
3. The combined mechanical seal
The combined mechanical seal technology is a new type of mechanical seal technology which combines various sealing technologies. It can give full play to the advantages of all kinds of sealing technology, and effectively avoid their disadvantages. Therefore, the mechanical seal technology of combination is the inevitable trend of the development of sealing technology. The combination forms of the end face mechanical seal technology are various. Among them, the most common type of contact combination is the sealing form of non-contact and contact type.