The mechanical seal uses a very small spring to make the sealing surface produce a uniform mechanical seal

The mechanical seal uses a very small spring to make the sealing surface uniform

2021-07-29 09:34

The later-designed mechanical seal uses a series of smaller springs, arranged around the main shaft, which can generate relatively uniform load pressure on the sealing surface of the mechanical seal. Because the smaller spring can be pre-installed, most of these mechanical seals are completely isolated from the liquid being pumped. For many highly corrosive service platforms, a very common design is the use of metal bellows seals. The bellows are welded from a series of metal discs to form a bellows seal that prevents leakage. Using this device can make the sealing pressure between the sealing surfaces more uniform, and there is no need to add a secondary seal on the sealing surface, so naturally there will be no corrosion and wear.

Generally speaking, although the main sealing pressure depends on the pressure of the stuffing box itself, the spring and bellows can compensate the lack of pressure due to the movement of the main shaft during the start and stop of the liquid pump, so that the sealing surface always maintains a certain sealing pressure.