Requirements of mechanical seal on sealing ring

The seal ring is the general name of dynamic ring and static ring (the same below), and is the most important component of mechanical seal. To a great extent, seal ring determines the service performance and life of mechanical seal, so some requirements are put forward for it.

Sufficient strength and rigidity: no damage under working conditions (such as pressure, temperature, sliding speed, etc.), deformation should be as small as possible, and the tightness can still be maintained when working conditions fluctuate. In particular, the sealing face should have sufficient strength and certain corrosion resistance to ensure that the product has a satisfactory service life.

Good thermal shock resistance: for this reason, the material is required to have a high thermal conductivity and a small coefficient of linear expansion, so that it will not crack under thermal shock.

Mechanical seal

Smaller friction coefficient: the matching of sealing ring should have smaller friction coefficient.

Good self-lubricating property: if dry friction occurs for a short time during operation, the sealing face will not be damaged. Therefore, the mechanical seal ring should have good self-lubricating property, and the seal ring material and seal fluid should also have good wettability.

Simple structure: the seal ring structure shall be simple and symmetrical, and the integral structure is preferred. The combined (such as embedded) seal ring can also be used, and the spraying structure of the seal end face shall be avoided as far as possible.