What Is A Mechanical Seal

Mechanical seal refers to a device composed of at least one pair of end faces perpendicular to the axis of rotation under the action of fluid pressure and the elastic (or magnetic force) of the compensation mechanism and the cooperation of auxiliary seals to maintain a fit and slide relative to each other.

The elastic loading mechanism and auxiliary seal are the mechanical seal of metal bellows, which we call metal bellows seals. In light sealing, there is also the use of rubber bellows as auxiliary seals, rubber bellows elasticity is limited, generally need to be supplemented with springs to meet the loading spring. "Mechanical seal" is often referred to simply as "machine seal".

A mechanical seal is a shaft seal device for rotating machinery. Examples include centrifugal pumps, centrifuges, reactors and compressors. Since the propeller shaft runs through the inside and outside of the equipment, in this way, there is a circumferential gap between the shaft and the equipment, through which the medium in the equipment leaks outward, if the pressure inside the equipment is lower than atmospheric pressure, the air leaks into the equipment, so there must be a shaft seal device to prevent leakage. There are many types of shaft seals, because mechanical seals have the advantages of less leakage and long life, so the world's mechanical seals are the most important shaft sealing method in these equipment. Mechanical seal, also known as face seal, is defined in relevant national standards as follows: "A device to prevent fluid leakage composed of at least a pair of end faces perpendicular to the axis of rotation under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism and the cooperation of auxiliary seals."