How does the vacuum coating machine leak? How to check the environmental requirements of the vacuum pump system?

Viewing the leak condition is a way to ensure the vacuum degree of the vacuum coater. For the sake of leak detection, the unevenness of the vacuum directly affects the coating effect, so leak detection is essential.

Usually, the air leakage in the vacuum chamber occurs from the small holes in the chamber wall or the joints in the joint position. When the pumping system draws air, the pressure in the vacuum chamber is reduced, and the difference between the external and internal pressures makes the gas from high pressure. The external flow direction is reduced in the vacuum chamber, and the degree of vacuum is lowered. In the process of leak detection, the need to pay attention to some problems, in order to do a good job of leak detection.

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First, we must admit that the virtual leak of the leak is still a real leak. Because the workpiece data will be heated to a different extent after it is heated, it may be mistaken for the gas flowing in from the outside. This is the virtual leak. Kind of situation.

Second, test the gas seal function of the vacuum chamber to ensure that the airtight function meets the requirements.

Third, look at the size, shape, orientation, and speed of the leak, and prepare a solution and implement it.

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Fourth, determine the minimum detectable leak rate and leak detection sensitivity of the inspection instrument, check the leak condition at the largest scale, prevent some leaks from being neglected, and improve the accuracy of leak detection.

Fifth, grasp the reaction time and elimination time of the leak detection instrument, grasp the time well, ensure that the leak detection instrument is in place, the time is small, the leak detection effect is definitely poor, the time is long, and the leak detection gas and the artificial electricity fee are wasted.

Sixth, it is also necessary to prevent leakage of the leak hole. Sometimes, due to operational errors, some dust or liquids block the leak hole during the leak detection process, so that there is no leak hole in the direction, but when these obstructions are distinguished by internal or external pressure, For other reasons, the leak is not blocked, and the leak still exists. It is very important to do leak detection for vacuum coating machines. There are many reasons for the reduction of vacuum. We need to solve these reasons one by one and stabilize the coating.

What are the environmental requirements for a vacuum pump system?

What are the environmental requirements for a vacuum pump system? Vacuum pump system use and maintenance is very important, absolutely can not be sloppy, the working environment of the vacuum system is indoor temperature 10~30 °C, relative humidity is less than or equal to 65%, cooling water inlet temperature can not exceed 25 °C, the voltage of the power supply allows The fluctuation range is ±10%.

And according to the actual situation of the vacuum system to develop a reasonable operating procedures.

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When using it for the first time, it is necessary to scrub all the parts and hungry. Be sure to check if the power supply line is normal and the power supply voltage meets the requirements.

Check whether the components such as mechanical pump, diffusion pump and valve are normal. When using for the first time, it may be left for a long time. The surface of each component in the vacuum system and the pump oil absorb a lot of water vapor and various gases, so it is very likely to be vacuumed. Less than the required vacuum.

If this happens, we can repeatedly vent and vacuum the second and third times to fully degas the components and pump oil.

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