Addtime： 2020-07-17 Browse times： 2447
When it comes to the internal leakage of vacuum pump unit, we should pay attention to it mostly, that is, it will happen on a device with water cooling jacket. When it comes to the internal leakage of the vacuum pump unit, in fact, we found no doubt during the inspection of the external leakage, but the pumping speed of the mechanical pump is obviously lower, and the indication value of the vacuum gauge is relatively low or the mechanical pump oil emulsifies quickly.
If it is found that the iron-based parts in the vacuum chamber of the vacuum pump unit will be obviously rusted. It can be determined that there is leakage. At this time, it should be noted that the inner wall should be cleaned first, and then, the cooling water should be filled to see if it has any wetting point. The wet part is the leakage point.
In fact, it is difficult to check the small leakage and micro leakage of the vacuum pump unit. The common method is to use the ionization tube sensitive to some gases in high vacuum state to detect the leakage. It is common to refer to acetone or ethanol, which can be directly sprayed to the suspicious place with a medical syringe. When it reaches the leakage point, we will find that the pointer of the ionization meter will swing obviously.
If we use this method to detect the leakage of the vacuum pump unit, we must be patient and wait until the indication value of the ionization meter is stable. In this respect, we will find that the balance between the pumping capacity and leakage rate can be realized, and then the injection can be realized.
For the larger leakage point of vacuum pump unit, the flame method can be directly used, and the principle of using air flow to directly make the flame deviate. It should be noted that the vacuum should be pumped first, and then, the candle or lighter should be used to gradually search the suspicious point of the vacuum pump unit.
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