Mechanical seals are mainly composed of moving rings, stationary rings, cooling devices, compression springs, sealing rings, fasteners, etc.
1. Face seal pair of mechanical seal (stationary ring and moving ring)
The end face sealing pair makes the sealing surface closely fit to prevent medium leakage. It requires that the static ring and the moving ring have good wear resistance. The moving ring can move flexibly in the axial direction to automatically compensate the wear of the sealing surface and make it fit well with the static ring; The static ring is floating and plays a buffer role. Therefore, the sealing surface shall have good processing quality to ensure good fitting performance of the sealing pair.
2. Elastic element of mechanical seal (spring, bellows, diaphragm)
The elastic element mainly plays the role of pre tightening, compensation and buffering. It is required to always maintain sufficient elasticity to overcome the friction of auxiliary seal and transmission parts and the inertia of moving ring, so as to ensure good fitting of end seal pair and follow-up of moving ring. The material is required to be corrosion-resistant and fatigue resistant.
3. Auxiliary seal of mechanical seal (O-ring, V-ring, U-ring, wedge ring and special-shaped ring)
The auxiliary seal mainly plays the sealing role of static ring and moving ring, as well as floating and buffering. It is required that the sealing element of the static ring can ensure the sealing between the static ring and the gland and the floating of the static ring, and the sealing element of the dynamic ring can ensure the sealing between the dynamic ring and the shaft or shaft sleeve and the floating of the dynamic ring. The material shall be heat-resistant, cold resistant and compatible with the medium.
4. Transmission part of mechanical seal (transmission pin, transmission ring, transmission seat, transmission key, transmission lug or tooth coupling)
The transmission part transmits the torque of the shaft to the moving ring. Materials shall be wear-resistant and corrosion-resistant.
5. Fastener of mechanical seal (set screw, spring seat, gland, assembly sleeve, shaft sleeve)
Fasteners are the positioning and fastening of static and dynamic rings. It is required that the axial positioning is correct to ensure a certain amount of spring compression, so that the sealing surface of the sealing pair is in the correct position and maintains a good fit. At the same time, it is required to be easy to disassemble, easy to place and reusable. At the fitting place with the auxiliary seal, the installation of the sealing ring shall have the guiding chamfer and elastic pressure. Special attention shall be paid to the wear resistance and corrosion resistance at the fitting place between the auxiliary seal of the moving ring and the shaft sleeve. If necessary, the hard surface coating can be used at the fitting place with the shaft sleeve.
6. Anti rotation part of mechanical seal (anti rotation pin)
The anti rotation part prevents the stationary ring from rotating and falling out. Sufficient length is required to prevent the static ring from falling out under negative pressure, and correct positioning is required to prevent the static ring from rotating with the moving ring. The material shall be corrosion-resistant. If necessary, a tetrafluoroethylene sleeve can be added in the middle to avoid damaging the carbon graphite static ring.
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