Clamp Saddle factory

If the centrifugal cryogenic Clamp Saddle factory produces noise and vibration during operation, and is accompanied by a decrease in flow, head and efficiency, sometimes it can not even work, and during maintenance, it is often found that there are pitting or honeycomb damage near the inlet edge of the blade. In severe cases, the entire blade has this phenomenon, and even the blade is penetrated, which is the damage caused by cavitation.　　

The cause of cavitation in the centrifugal cryopump: the pump does work on the liquid through the rotating impeller, which increases the energy of the liquid. During the interaction, the velocity and pressure of the liquid change. Usually, the inlet of the centrifugal cryopump impeller is the place with the lowest pressure. If the pressure in this place is equal to or lower than the vaporization pressure of the liquid at that temperature, there will be a large amount of steam and gas dissolved in the liquid escaping from the liquid, forming many small bubbles of steam and gas mixed.

When these small bubbles flow with the liquid to the high-pressure zone, the vaporization pressure inside the bubble is greater than the vaporization pressure around the bubble, resulting in a pressure difference. Under the action of this pressure difference, the bubble bursts under pressure and condenses again. During the condensation process, the liquid particles accelerate from the surroundings to the center of the bubble. At the moment of condensation,

the particles collide with each other, generating high local pressure. If these bubbles burst and condense near the metal surface, the liquid particles will continue to hit the metal surface like countless small warheads. Under high-pressure and high-frequency continuous blows, the metal surface is gradually damaged due to fatigue. This damage is usually called denudation. Some active gases (such as oxygen, etc.) are also mixed in the generated bubbles, and the heat released when the bubbles are condensed can chemically corrode the metal. 

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