The conflict pair should ensure a tight fit and form a sealing surface to avoid media leakage. This requires the pump
mechanical seal friction pair to have good wear resistance; the moving ring can move axially to actively compensate for the wear of the sealing surface, so that it fits well with the static ring; the static ring has a floating and buffering effect.
2) Elastic elements (springs, bellows, barriers, etc.)
It mainly plays the role of compensation, preloading and buffering, and it is also the factor that generates a reasonable pressure on the sealing end face. It is required that the mechanical seal should always adhere to the elasticity to overcome the conflict between the auxiliary seal and the transmission parts and the inertia of the moving ring, etc., to ensure the good fit of the end-face conflict and the compensation effect of the moving ring.
3) Auxiliary seals (special-shaped seal rings such as O-rings, V-rings, wedge-shaped rings, etc.)
It mainly plays a sealing effect on the relative stop, and also plays a floating and buffering effect. The auxiliary sealing element of the static ring is required to ensure the sealing between the static ring and the gland and the sealing ring to have a certain floating property; the auxiliary sealing element of the moving ring is required to ensure the sealing between the moving ring and the shaft sleeve. The material should have heat resistance, cold resistance and compatibility with the medium.
4) Transmission parts (transmission pin, transmission ring, transmission seat, transmission sleeve, transmission key)
It has the effect of transmitting the torque of the shaft to the moving ring; the transmission pin, the pressure ring, the transmission ring, the transmission pin and the transmission seat of the central transmission all have the transmission effect. Corrosion resistance and wear resistance are required for information.
5) Fasteners (set screws, spring seats, glands, assembly sleeves, shaft sleeves)
It plays the role of positioning, fastening and dressing of static and dynamic rings. It is required that it be positioned accurately, ensure that the conflicting auxiliary sealing surface is in the correct position, and maintain a good fit of the spring ratio. At the same time, it is required to be convenient for disassembly and assembly, easy to install, and can repeat the effect. The place that cooperates with the auxiliary seal should pay attention to the chamfering of the installed seal ring and the amount of elastic compression of the ring. Special attention should be paid to the corrosion resistance of the auxiliary seal ring of the movable ring and the shaft sleeve. , wear resistance, hard surface coating can be adopted if necessary.
