Which is the best mechanical seal or packing seal?

Which is the best mechanical seal or packing seal? Packing seal is a traditional touch seal, which is widely used. Simple structure, convenient replacement, low cost, wide application range (can be used for sealing of rotating, reciprocating, and spiral motion), and axial movement of the rotating shaft is allowed. The lack of it is that the sealing function is slightly worse, the shaft does not allow large radial runout of the mechanical seal, the power consumption is large, the shaft is worn, and the service life is short. The packing seal is a little fit with the packing through the outer surface of the shaft, forming a labyrinth-effect mechanical seal that should reach the seal. Because of the sliding seal, it should be smooth with a satisfactory liquid to ensure that the seal has a certain life span, the so-called bearing effect. The packing also requests data: 1. Definite elastoplasticity 2. Chemical stability 3. Impermeability 4. Good self-smoothness, small conflict coefficient and wear resistance 5. Temperature resistance 6. Easy assembly and disassembly, etc. Mechanical seal Good performance, stable function, less leakage, low conflict power consumption, long operation cycle, little shaft wear, and can satisfy various working conditions. It is widely used in petrochemical and other parts, but its structure is messy, high production accuracy, and quotation More expensive and inconvenient to repair. Mechanical seals are also called end face seals. They have at least one pair of end faces perpendicular to the axis of rotation. Under the effect of fluid pressure and compensation of mechanical external elastic force (or magnetic force), this section faces the cooperation of auxiliary seals and adheres to the other end face. Relative to East China, thus constituting avoidance of leakage. Since the two sealed end faces are tightly attached, the border between the sealed end faces forms a small gap. When the pressurized medium passes through this gap, an extremely thin liquid film is formed, which causes resistance, prevents the leakage of the medium, and makes the end surface smooth. This achieves a long-term sealing effect. Keywords: mechanical seals, mechanical seals