Mechanical seal

A device that prevents fluid leakage by maintaining close contact and allowing relative sliding, driven by the elasticity (or magnetism) of a compensating mechanism and with the assistance of an auxiliary seal.

It is a compensatory effect, which manifests as continuous compression of the stationary ring.

During shaft rotation, it moves back and forth along the axial direction; the spring is used to compensate for the excessive or insufficient gap between the stationary and rotating rings caused by this axial movement

Definition of mechanical seal: A mechanical seal is a device designed to prevent fluid leakage, consisting of at least one pair of end faces perpendicular to the axis of rotation. These end faces remain in close contact with each other and slide relative to one another under the action of fluid pressure and the elastic force (or magnetic force) of a compensating mechanism, along with the assistance of auxiliary sealing elements. It is commonly used in rotary fluid machinery such as pumps, compressors, and reaction kettles, as well as for sealing purposes in gearboxes, valves, rotary joints, and ship propellers. The compensating effect can be provided by elastic or magnetic forces; the elastic force can come from springs or bellows, with similar effects. There are single springs and multiple springs, and their function is to ensure that the moving and stationary rings remain in close contact during operation, while also maintaining a certain degree of compression to prevent leakage of the medium. Springs can be installed on either the moving ring side or the stationary ring side, with the specific design determined by the requirements of use. Since the equipment is in operation, the rotor shaft experiences slight axial movement, and the stationary and rotating rings also wear out over time; therefore, a compensation mechanism is essential to ensure that these rings remain in close contact with each other and maintain a certain degree of compression.