What is a mechanical seal? Machinery Seal

What is a mechanical seal?

2021-08-21 10:02

Mechanical seal (mechanical seal) refers to at least one pair of end faces perpendicular to the axis of rotation, under the benefit of fluid pressure and compensation mechanism elastic force (or magnetic force) and the cooperation of auxiliary sealing, which is composed of joint fit and relatively sliding to prevent fluid leakage. assembly.

The elastic loading mechanism and the auxiliary seal are mechanical seals of metal bellows, which we call metal bellows seals. In light-duty 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.“Machinery Seal”usually referred to as“machine seal”.

The mechanical seal is a shaft seal assembly of a rotating machine. Such as centrifugal pumps, centrifuges, reactors and compressors and other equipment. 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 internal pressure of the equipment is lower than the atmospheric pressure, the air will leak into the equipment, so there must be a Leakage-free shaft seal assembly. There are many types of shaft seals. Because mechanical seals have the advantages of less leakage and long life, mechanical seals are the most important shaft sealing methods in these equipments in the world. The mechanical seal is also called the end face seal, which is defined in the relevant national standards as follows:“An assembly that prevents fluid leakage by combining at least one pair of end faces perpendicular to the axis of rotation under the fluid pressure and the benefits of the elastic force (or magnetic force) of the compensating mechanism and helping to seal.