Mechanical seal for its good seal performance, stable operation, less leakage, friction power consumption is low, use cycle is long, the shaft wear is small, and can meet the requirements of a variety of conditions, so widely used. But make structure is relatively complex, high precision, the price is more expensive, maintenance inconvenience.

Principle and its composition:

, also known as end face seal, it at least a pair of perpendicular to the axis of the rotating end face, the face in the fluid pressure and filling

Compensation under the action of external mechanical forces (or magnetic force), combined with the auxiliary seal, keep stick to merge with the other end

The relative sliding, thus preventing fluid leakage. As a result of the end face fit closely, make tiny formed between the seals

Clearance, when there is a medium through this gap, forming a very thin liquid film, causing resistance to prevent the leakage, and lubrication

End, achieve long-term sealing effect.

Basic components:

Static ring and the selected swivel (ring and static ring), usually in the form of grinding surface, also known as the friction pair.

Additional buffer mechanism is given priority to with elastic element.

The auxiliary seal ring

The ring and shaft rotating driving part together

The classification of the mechanical seal

According to use classification:

According to the equipment can be divided into the pump, kettle, centrifuge, fan, submersible pump, cooling water pump, motor, refrigerator, internal combustion engine

And other Marine pumps.

Classification according to the principle:

The seals of logarithmic: single face and double face, face more. The double end face is divided into axial double end face and size

To the double end face.

According to the fluid pressure acting on the seal face to unload or not unloading can be divided into: the balance type, part of the balance type, full balance type.