Mechanical seal, also known as end seal, is a device that utilizes end face friction to seal, and is a common sealing means for Changsha Roots Blower. Friction by the moving ring and static ring end face fit into, assembly by the elastic element for pre-tensioning, work by the elastic element and media pressure will be clamped.

Commonly used model seals, there are two types of single-end face seal and double-end face seal. When the blower is in operation, the moving ring rotates with the shaft, the end faces of the moving and static rings slide relative to each other, and the coolant forms a very thin liquid film in the tiny gap between the two ends, preventing the leakage of gas and lubricating the end faces at the same time. Even if the end face is worn out, under the action of spring force, the dynamic ring will move axially, automatically compensate, and continue to closely fit with the static ring end face.

As a contact type seal, mechanical seal has good sealing effect; as an end face seal, it has no wear on the shaft. At the same time, because the sealing ring is usually made of lubricating material and lubricated with the help of sealing liquid, so the friction power consumption is low and the service life is long. However, the structure is more complex, the precision requirements are higher, the price is more expensive, the maintenance is not very convenient. Generally only used for sealing higher requirements, other types of seals can not meet the requirements of the occasion.