Which is the best mechanical seals and packing seals

Packing seal is a traditional contact seal, widely used. Simple structure, easy to replace, low cost, wide range of applications (can be used for rotary, reciprocating, spiral movement of the seal), the rotary movement of the shaft is allowed to have axial runout. The shortcomings of the sealing performance is slightly worse, the shaft does not allow a large radial runout, power consumption, wear and tear of the shaft, the use of short life.

Packing seal through the shaft surface and packing part of the labyrinth effect to achieve sealing. Because it is a sliding seal should have enough liquid lubrication to ensure that the seal has a certain life, the so-called bearing effect.

Packing and material requirements: 1, a certain degree of elasticity and plasticity 2, chemical stability 3, impermeability 4, self-lubricating and good, small coefficient of friction and wear-resistant 5, temperature 6, easy to install and dismantle, etc.

Mechanical sealing sealing, stable performance, less leakage, low friction power consumption, long life cycle, very little wear and tear of the shaft to meet a variety of working conditions, widely used in the petrochemical industry, but its mechanism is complex, the labyrinth effect to ensure that the seal has a certain life, the so-called bearing effect. Widely used in petrochemical and other sectors, but its organization is complex, high manufacturing precision, expensive, inconvenient maintenance.

Mechanical seals, also known as face seals, which has at least one pair of perpendicular to the axis of rotation of the end face, the section of the face in the fluid pressure and compensation of mechanical external elasticity (or magnetic), coupled with auxiliary seals, and the other end of the face to keep close to the relative Huadong, which constitutes the prevention of leakage. As the two sealing end face close fit, is the junction between the sealing end face to form a small gap, when the pressure medium through this gap, the formation of a very thin liquid film, resulting in resistance, to prevent media leakage, but also to enable the end face to be lubricated, and thus obtain a long-term sealing effect.