What is a mechanical seal?

     Mechanical seal refers to at least one 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, the pair of end faces remain in contact and slide relative to each other. A device to prevent fluid leakage.

     The elastic loading mechanism and auxiliary seal are mechanical seals of metal bellows, collectively called metal bellows seals. In light seals, rubber bellows are also used as auxiliary seals. Rubber bellows have limited elasticity, and generally need to be supplemented by springs to meet the loading elasticity. "Mechanical seal" is often referred to as "mechanical seal".

     Mechanical seal is a shaft sealing device used in rotating fluid machinery. Such as centrifugal pumps, centrifuges, reactors and compressors. Since the transmission shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment, and the medium in the equipment leaks out through this gap. If the pressure inside the equipment is lower than the atmospheric pressure, the air will leak into the equipment, so there must be a Shaft seal device to prevent leakage. There are many types of shaft seals. Since mechanical seals have the advantages of low leakage and long life, mechanical seals are the most important shaft sealing method in these equipment in the world. Mechanical seals are also called end face seals. They are defined in relevant national standards as follows: "They consist of at least one pair of end faces perpendicular to the axis of rotation, which are maintained in close contact with each other under the action of fluid pressure, the elastic force (or magnetic force) of the compensation mechanism, and the cooperation of auxiliary seals. A device formed by relative sliding to prevent fluid leakage."