The basic principle of mechanical seals

Due to the pressure difference between the fluid in the pump and the atmosphere outside the pump, in order to prevent the leakage of the slurry, the pump needs to be equipped with a sealing device during operation, called a shaft seal. Commonly used shaft seal types are: packing seal, mechanical seal, power seal and floating seal. From the current situation of pumps in various industries, mechanical seals have become a common sealing form in various industries, and the sealing form runs smoothly and reliably, bringing great economic benefits to various industries.

A mechanical seal is a sealing device composed of two sealing elements (static ring and moving ring) perpendicular to the smooth and straight surface of the shaft and rotated relative to each other, as shown in Figure 1. It relies on the pressure of elastic members (such as spring 6) and sealing medium to generate appropriate pressing force on the contact surface (end face) of the rotating moving ring and static ring, so that the two end faces fit tightly.

The purpose of sealing is achieved by maintaining an extremely thin liquid film between the end faces, which has hydrodynamic pressure and static pressure. It plays the role of lubrication and sealing. Slurry pumps, desulfurization pumps, agitators and other products can adopt mechanical seals under different working conditions.