The biggest headache for users is the detection of leakage rate of liquid ring vacuum pump. Leakage – internal leakage and external leakage, external leakage is better detection, internal leakage is more difficult to do. Larger leakage point can use the flame method, the use of airflow can make the principle of flame deviation, first take a vacuum, such as candles or lighters in the vicinity of the suspect point gradually searched, will find the flame to the leakage point deviation, can find the leakage point.
1, leakage and micro leakage search
Small leakage and micro leakage is more difficult to check, the commonly used method is to use in the state of high vacuum ionization tube sensitive to some gas reaction to detect the leakage, such as acetone or ethanol, with a medical syringe to the suspicious place acetone or ethanol, spray to the leakage point, the needle of the ionization meter will have a significant swing. Leak detection in this way must be patient, must wait until the ionization meter reading is stable – that is, the vacuum unit’s pumping capacity and leakage rate balance, then injection. It is better to repeat several times to identify the missing point.
2, leakage and leakage of the search
Internal leakage mostly occurs on the equipment with water cooling sleeve, no suspicious point is found after checking external leakage, but there are the following phenomena: the vacuum pumping speed of mechanical vacuum pump is obviously low, the value of vacuum gauge is low, the oil of mechanical vacuum pump is emulsified quickly, the iron base parts in the vacuum chamber are obviously corroded. With the above conditions can be determined to have internal leakage. Example: there is a 25 ㎏, intermediate frequency furnace is equipped with 2 x – 70 rotary vane vacuum pumps and two what ZJ had – 150 roots vacuum pump together to smoke only smoke to 10 Pa, what ZJ had appeared – 150 vacuum pump role not to come out, didn’t find any leakage, but with the mechanical vacuum pump oil emulsification soon, vacuum indoor iron-based obvious corrosion condition, the collapse of the equipment is detected with the method of the flux of cooling water after clean furnace cover is leaking, the rest is funnelled it up. Clean up the inner wall first, then pass the cooling water, see whether there is any wetting point, wetting point is leakage point.
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