The Function of Mechanical Seals

Mechanical seals are commonly known as water seals or machine seals. They are essential components used in pump parts such as water pumps and sludge pumps. They generally consist of a moving ring and a stationary ring. The materials of the moving ring include rubber seals, springs, and mirror alloys. The materials of the stationary ring include rubber seals, mirror ceramics, or silicon carbide.
Classification of Mechanical Seals
1. Internal type: Those placed inside the working medium are called internal type. Generally, water pumps adopt the internal type.
2. External type: Those placed outside the working medium are called external type. For strong acid and strong alkali working media, the external type is generally used. Considering the influence of the medium on the spring and its corrosion effect on service life, the medium is likely to crystallize, affecting the performance of the spring; if the medium is viscous, it prevents the spring from working properly.
The Function and Installation of Mechanical Seals
1. A mechanical seal refers to a device that prevents fluid leakage by keeping at least a pair of end faces perpendicular to the rotation axis in contact and sliding relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a compensating mechanism, along with the cooperation of an auxiliary seal.
2. In light-duty seals, rubber bellows are also used as an auxiliary seal. The elastic force of rubber bellows is limited, and generally a spring is needed to meet the loading elastic force.
3. Simply put, a mechanical seal is a sealing component that prevents the medium from flowing into the motor, causing the motor to burn out and not work properly.
Installation Requirements
1. The smoothness of the shaft surface is a necessary condition to ensure the normal operation of mechanical seals. For rusted shafts, they should be polished smooth with sandpaper to ensure a tight fit between the shaft and the sealing surface of the mechanical seal. 2. For the selection of mechanical seal materials, in environments with high working pressure, it is recommended to choose alloy materials for the seals.
3. When installing mechanical seals, they must be handled with care to ensure that the end faces are not cracked.
4. Attention should be paid to avoiding installation deviations. Tightening the gland should be carried out after aligning the coupling, and bolts should be evenly supported to prevent the gland end faces from tilting. Use feeler gauges to check each point, with an error not exceeding 0.05 millimeters.
5. A little lubricating oil can be applied during installation to reduce end face friction and extend the service life of the seals.
6. If there is slight leakage after the pump starts, observe for a period of time. If the leakage does not decrease after continuous operation for 4 hours, the pump should be stopped for inspection.