The function of the vacuum pump is to extract gas molecules from the vacuum chamber, reduce the pressure of the gas in the vacuum chamber, so as to achieve the required vacuum degree. In a nutshell, there is a large range from the atmosphere to the very high vacuum, and no vacuum system has yet covered this range.
Therefore, it is necessary to choose different vacuum system configurations for different product process indexes, working efficiency and equipment working life. For optimal configuration, the following points should be considered when selecting a vacuum system:
1. Determine the working vacuum range
The vacuum required for each process must first be checked and determined. Because each process has its appropriate vacuum range, it must be carefully studied and determined.
2. Determine the ultimate vacuum
On the basis of the determined the technological requirements of vacuum check limiting vacuum of vacuum pump system, because the system of the ultimate vacuum decided the best job in the vacuum of the system.
Generally speaking, the ultimate vacuum degree of the system is 20% lower than the operating vacuum degree of the system, and 50% lower than the ultimate vacuum degree of the front pump.
3. Main vacuum pump selection calculation
S = 2.303 v/tlog (p1 / p2)
Where, s is the pumping rate of the vacuum pump, v is the volume of the vacuum chamber, t is the time required to reach the required vacuum degree, p1 is the initial vacuum degree, p2 is the required vacuum degree.
4. Vacuum volume
Check to determine the time required to achieve the required vacuum, flow resistance and leakage of the vacuum pipeline. Consider the extraction rate needed to maintain the vacuum under certain process conditions after the required vacuum degree is achieved.
5. Type and amount of gas being pumped
Check and determine the type and volume of extraction required by the process. Because if the type of gas being pumped reacts with the liquid in the pump, the pump system will become contaminated. At the same time, consideration must be given to determine the appropriate exhaust time and the amount of gas generated during the extraction process.
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