There are two kinds of reasons for the seal damage of multistage vacuum pump: artificial damage and natural damage. The seal of multistage vacuum pump will be damaged by scratch, bruise and squeeze when it is opened and closed. Mechanical damage between two sealing surfaces. Under the action of high temperature and high pressure, atoms permeate each other and cause adhesion. When the two sealing surfaces move with each other, the adhesion is easily pulled and torn. The higher the surface roughness of the sealing surface of the multi-stage vacuum pump, the more easily this phenomenon occurs.
When the medium is active, the sealing surface of multi-stage vacuum pump is worn, washed and cavitated. The floating fine particles in the medium collide with and offend the sealing surface, causing local damage. The high-speed moving medium directly washes the sealing surface, causing local damage. When the medium is mixed and vaporized locally, the gas generating bubble blasting impacts the sealing surface, causing local damage. Medium erosion and chemical erosion alternate action, will strongly erode the sealing surface.
The potential difference and electrochemical corrosion will occur due to the contact between sealing surfaces, the contact between sealing surfaces and sealing body and valve body, as well as the concentration difference of medium and oxygen concentration, which will lead to the corrosion of sealing surface on the anode side. However, in the case of no current generated by the medium near the sealing surface, the medium directly reacts with the sealing surface, forming chemical erosion and eroding the sealing surface.
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