Mechanical seal is an important shaft seal device, the following is some cold knowledge about mechanical seal:
Mechanical seal is a rotating mechanical shaft seal device, composed of dynamic ring, static ring, spring seal ring, etc. The dynamic ring rotates with the shaft and moves axially, the static ring is installed on the pump body stationary, and the longitudinal ring depends on the liquid pressure in the sealing chamber and the spring elasticity, so that the end face and the end face of the static ring are closely fitted to form a minimal axial gap, so as to achieve the sealing effect
1. The origin of mechanical seals: mechanical seals first appeared in the United Kingdom as a patent in 1885, but they did not begin to be applied until 1900. With the passage of time, with the development of the petrochemical industry and the emergence of new materials, mechanical seals have been widely promoted and applied.
2. Structure of mechanical seal: mechanical seal is usually composed of static ring (static ring), rotating ring (moving ring), elastic element spring seat, setting screw, rotating ring auxiliary seal ring and static ring auxiliary seal ring and other components. These components work together to prevent fluid leakage.
3. Dynamic ring sealing ring is not the tighter the better: although people often think that the tighter the dynamic ring sealing ring is the better, in fact, too tight dynamic ring sealing ring may lead to premature failure of the shaft pad, but affect the sealing effect. Moderate lock lock mother, so that the shaft pad to maintain a certain compression elasticity, in the operation of the lock mother will automatically lock timely, so that the shaft is always in a good seal state.
4. Application scenario of mechanical seal: Mechanical seal has a wide range of applications in industrial production, including petroleum, chemical industry, metallurgy, machinery, aviation and atomic energy. For example, in sewage treatment plants, centrifugal pumps often use double-ended mechanical seals to prevent sewage leaks.
5. Maintenance and transformation of mechanical seals: mechanical seals need regular inspection and replacement to ensure the normal operation of the equipment. In some cases, the performance of the original mechanical seal may not meet the requirements of use and needs to be modified. For example, the leakage rate of the compressor can be reduced by changing the sealing ring material and improving the sealing structure.
6. Precautions for the installation of mechanical seals: When installing mechanical seals, it is necessary to pay attention to the radial runout and axial channeling of the equipment rotating shaft, as well as the cleanliness of the sealing part. At the same time, the installation should avoid hitting and knocking, in order to prevent the mechanical seal friction pair damage and failure.
This cold knowledge helps us to have a deeper understanding of the principle, application and maintenance methods of mechanical seals, so as to better ensure the normal operation of equipment.