vacuum oil filling equipment maintenance points
Vacuum oil filling equipment: what are the key points of repairing vacuum equipment?
Answer: the key point of repairing vacuum equipment is to judge the fault. There may be several reasons why the vacuum can not be pumped up. It is necessary to find out the reasons, such as the insufficient pumping capacity of the vacuum unit or the high leakage rate, or both. At this time, we should observe and record patiently to find out the fault. For example, if the evacuation time is the same and the vacuum degree is low, close the high-pressure valve. If the pointer of the vacuum gauge drops quickly, the vacuum chamber leaks in most cases. At this time, the leakage point should be found out first.
If the pointer of the vacuum gauge drops slowly, most of the time, the vacuum unit's pumping capacity is not enough. At this time, the focus can be put on finding the vacuum pump and valve to see where there is leakage, or the diffusion pump oil is contaminated and oxidized; or the front stage pipeline seal is not well sealed and the pump oil is insufficient; or the pump oil emulsification, shaft seal oil leakage, valve plate damage and other faults.
Q: what's the biggest headache for users?
A: the most troublesome problem for users is the detection leakage rate. Leakage is divided into internal leakage and external leakage; external leakage is better to detect, while internal leakage is more difficult to handle. The larger leakage point can be used by flame method. According to the principle that air flow can make the flame deviate, vacuum is pumped first, and then the candle or lighter is used to search the suspicious point step by step. If the flame moves towards the leakage point, the leakage point can be found. We can use the self-made leak detector to detect the leakage within the working range of the rotary vane pump. Now we have produced ZHC. 1 type instrument. The instrument uses ZJ. 2 ionization gauge, which is connected to the suction port of rotary vane pump. If the diffusion pump unit, the leakage rate of l0 PA level can be detected.
Q: how to check small leakage and micro leakage?
A: small leakage and micro leakage are more difficult to check. The common method is to use the ionization tube sensitive to certain gases in high vacuum state to detect leakage, such as acetone or ethanol. Use a medical syringe to spray acetone or ethanol to suspicious places. When spraying to the leakage point, the pointer of the ionization meter will swing obviously. In this way, we must be patient and wait until the indication value of the ionization meter is stable, that is, the suction capacity and leakage rate of the vacuum unit are balanced before spraying. It is best to repeat several times to confirm the leakage. ZHC 1.1 can be used to detect the leakage of the instrument in a different range.
In today's power high-voltage equipment or instrument, with the improvement of the quality and performance requirements of the equipment or instrument, the requirements of each link in the production are also constantly improving, and the production process is also changing and updating. Vacuum oil injection is generally required for large main transformers and transformers to ensure that the insulation performance of the equipment will not be reduced due to the moisture in the air, and even serious accidents such as internal breakdown and short circuit will occur due to the excessive moisture content in the transformer oil. In the field of medical equipment, X-ray machine and CT machine have been widely used in various clinical hospitals. In X-ray machine and CT machine, there is a key component of high-pressure generator or high-pressure ball tube, which also needs vacuum oil injection during production or maintenance.