The Mechanical Seals Components relies on the self-resilience of the sealing material to obtain a seal, while the lip seal may have eccentricity, and it also needs to rely on the elasticity of the material to compensate for the insufficient contact stress of the seal, so the elasticity is important for the sealing effect of the sealing ring. very important. Regardless of whether it is at high temperature or low temperature, very low temperature and very high temperature describe an instantaneous temperature, that is, a certain material sealing ring can withstand the instantaneous extreme temperature, as long as the sealing ring is close to the temperature limit and is in a certain temperature for a long time. At the extreme high temperature level, the seal will soon fail, then at low temperature, the sealing material gradually loses its elasticity until it reaches the crystallization temperature of the material, which is called glass transition phenomenon, and then loses elasticity. The seal fails, so the material is a sealing ring. The core and sealing ring design are based on material selection.

Common seals are divided into static seals and dynamic seals according to motion, and dynamic seals include reciprocating linear motion and rotary shaft seals. In this case, rotary shaft seals are used. Common shaft seals include mechanical seals, packing (also known as packing), oil seals, screw seals, floating carbon ring seals, magnetic fluid seals, dry gas seals, brush seals, etc. Carbon ring seals, dry gas seals, and brush seals are generally used to seal gas; mechanical seals, packings, and oil seals are generally used to seal liquids.

Fluid is liquid, assuming high pressure and rotational speed, oil seals can be excluded (for light load conditions); there are 2 remaining options: mechanical seals or packing seals.

Mechanical seals are recommended for the following reasons: Compared with packing seals, they have the following advantages:

Good sealing, the leakage is an order of magnitude lower than that of the packing; long service life; no need for frequent adjustment, automatic compensation after wear; low friction power, generally only about 0.2-0.3 of the packing seal; no wear on the shaft or bushing; shock resistance Strong performance, when the equipment vibrates within a certain range, it can still maintain a good sealing effect.