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What should be considered when choosing vacuum pump

The function of vacuum pump is to remove gas molecules from the vacuum chamber, reduce the gas pressure in the vacuum chamber, and make it reach the required vacuum degree. Generally speaking, there is a wide range from atmosphere to extremely high vacuum. So far, no vacuum system can cover this range. Therefore, in order to meet the requirements of process index, working efficiency and equipment working life of different products, different vacuum system configuration should be selected for different vacuum sections. In order to achieve the best configuration, the following points should be considered in the selection:


First of all, it is necessary to check and determine the vacuum degree required by each process, and then check the limit vacuum degree of the vacuum pump system, because the limit vacuum degree of the system determines the best working vacuum degree of the system.


Check and determine the type and volume of pumping required by the process. Because if the type of gas to be pumped reacts with the liquid in the pump, the pump system will be polluted. At the same time, it must be considered to determine the appropriate exhaust time and the amount of gas produced in the process of pumping.

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Check and determine the time required to reach the required vacuum degree, flow resistance and leakage of vacuum pipeline. Considering the pumping rate required to maintain the vacuum under certain process conditions after reaching the required vacuum degree.


s=2.303(v/t)lg(p1/p2)


Among them:


S is the pumping rate of vacuum pump (L / s)


V is the volume of vacuum chamber (L)


The time required to reach the required vacuum (T)


P1 is the initial pressure in the container


P2 is the air pressure in the container after pumping


influence factor


It determines the size of the product. The higher the demand for air extraction, the larger the volume of the product, and the higher the motor power required. It is to determine what kind of product structure, vacuum is gauge pressure and absolute pressure of these two readings. Absolute pressure indicates that the reading is absolute, that is, the closer the reading is to "0", the higher the vacuum. On the other hand, the closer the gauge pressure is to 760 MMH ɡ, the higher the vacuum degree is. If the absolute pressure (ultimate vacuum) you requested is close to "0 \", then only the vacuum pump can meet this demand.


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