Cavitation, also known as cavitation. It refers to the phenomenon of cavernous corrosion damage on the metal surface in contact with the fluid under the conditions of high-speed flow and pressure change. If the rotary fan works for a long time in the cavitation state, it will cause bad conditions such as noise and vibration. Therefore, it should be avoided to work in the cavitation state as far as possible. The following methods can be used:

1、降低工作液的溫度

1. Reduce the temperature of working fluid

在回轉(zhuǎn)式風(fēng)機(jī)工作點(diǎn)為固定值的前提下，降低工作液的溫度可以達(dá)到防止氣蝕的效果。采用具有更低的飽和蒸汽壓的液體作為工作液。

On the premise that the working point of the rotary fan is a fixed value, reducing the temperature of the working fluid can achieve the effect of preventing cavitation. Use the liquid with lower saturated vapor pressure as the working fluid.

2、運(yùn)行在區(qū)域，提高選型的準(zhǔn)確性

2. Operate in the area to improve the accuracy of model selection

這要求在選型階段，選擇吸入壓力及工作液溫度時(shí)盡量避開(kāi)容易發(fā)生氣蝕的壓力范圍。

This requires that in the selection stage, the suction pressure and working fluid temperature should be selected to avoid the pressure range prone to cavitation.

3、安裝汽蝕保護(hù)管路或單向閥

3. Install cavitation protection pipeline or check valve

氣蝕過(guò)程中產(chǎn)生的氣泡在壓縮過(guò)程中破裂時(shí)，從外部引入壓力較高的不凝氣體能夠及時(shí)補(bǔ)充因氣泡破裂而出現(xiàn)的空間，這樣可以大大減輕氣蝕對(duì)泵的損害及降低氣蝕引起的噪聲和振動(dòng)。泵的葉輪、圓盤(pán)采用防氣蝕能力較強(qiáng)的材質(zhì)。

When the bubbles produced in the process of cavitation burst in the compression process, the introduction of non condensable gas with high pressure from the outside can timely supplement the space caused by bubble rupture, which can greatly reduce the damage of cavitation to the pump and reduce the noise and vibration caused by cavitation. The impeller and disc of the pump are made of materials with strong anti cavitation ability.

4、配大氣噴射器

4. Equipped with air ejector

如果回轉(zhuǎn)式風(fēng)機(jī)的吸氣口配有大氣噴射器，則不易發(fā)生氣蝕現(xiàn)象。

If the suction port of the rotary fan is equipped with an atmospheric ejector, cavitation is not easy to occur.

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