When merchants purchase a pvd coating machine, they must be equipped with one or more vacuum pumps, because the real coating machine needs to be in a vacuum environment during the coating process, so it is necessary to use a vacuum pump to achieve a vacuum environment, and then the product can be vacuumed smoothly. The next series of processes are carried out under the conditions.

      A vacuum pump refers to a device or equipment that uses mechanical, physical, chemical or physical-chemical methods to evacuate the pumped container to obtain a vacuum. In layman's terms, a vacuum pump is a device that uses various methods to improve, generate and maintain vacuum in a closed space. According to the working principle of vacuum pump, vacuum pump can be basically divided into two types, namely gas capture pump and gas transmission pump. It is widely used in metallurgy, chemical industry, food, electronic coating and other industries.
      For a vacuum coating machine, the vacuum pump is an indispensable part of obtaining a vacuum environment. Each pvd coating machine manufactured by the manufacturer is equipped with one or more vacuum pumps.
      1. When choosing a vacuum pump, first of all, pay attention to whether the vibration generated by the vacuum pump during operation has an impact on the process and the environment. If the process is affected, anti-vibration measures should be taken or another vacuum pump should be selected. When choosing, you need to know the composition of the gas to be pumped. If you need to selectively pump, one pump may not be enough to meet the requirements, and a variety of different pumps must be combined to work with each other. If the pvd coating machine coating requires no oil, you must Choose an oil-free pump.
      Second, the price and maintenance cost of the vacuum pump is also one of the key points we consider.
      3. The pvd coating machine has more and more requirements for the limit of vacuum degree and working pressure strength, and the higher the requirements for the vacuum pumping capacity of the vacuum pump, at least the ultimate vacuum degree of the pump is higher than half of the working vacuum degree of the vacuum machine. order of magnitude or more. Each pump has a certain working pressure range. For example, the pressure of a diffusion pump is 3~10-7mmHg, and its stable working pressure range is 5*10-4~5*10-6mmHg. Work outside the unspecified operating pressure range.
      4. When the gas pressure required by the pump is not high or the required vacuum degree is not high, the single-stage pump can be selected first, and the requirements for exhaust pressure or vacuum degree are relatively high, and it is often impossible to click the pump. To meet the requirements, you can choose to use a two-stage pump or a multi-stage pump.