Vacuum pump selection points and uses
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1, to determine the working vacuum range must first check to determine the degree of vacuum for each process requirements. Because each process has its own vacuum range, it must be carefully studied and determined.
2. Determine the ultimate vacuum degree Check the ultimate vacuum degree of the vacuum pump system on the basis of determining the degree of vacuum required by the process, because the ultimate vacuum degree of the system determines the optimal working vacuum degree of the system. In general, the ultimate vacuum of the system is 20% lower than the working vacuum of the system and 50% lower than that of the foreline pump.
3, the type of gas to be pumped and the amount of gas extracted to determine the process requirements of the type of pumping and pumping. Because if the type of gas being pumped reacts with the liquid in the pump, the pump system will be contaminated. At the same time, consideration must be given to determining the appropriate venting time and the amount of gas generated during the pumping process.
4. The vacuum volume check determines the time required to reach the required vacuum level, the flow resistance and leakage of the vacuum piping.
Consider the pumping rate required to maintain the vacuum after achieving the required vacuum level under certain process requirements.
5, vacuum pump formula S = 2.303V/tLog (P1/P2)
among them:
S is the vacuum pumping rate (L/s)
V is the volume of the vacuum chamber (L)
t time required to reach the required vacuum (s)
P1 is the initial vacuum (Torr)
P2 is the required vacuum (Torr)
E.g:
V=500L
t=30s
P1=760Torr
P2=50Torr
Then: S=2.303V/tLog(P1/P2)=2.303x500/30xLog(760/50)=35.4L/s
Of course, the above formula is only a theoretical calculation result, there are several variables that are not taken into account, such as the flow resistance of the pipeline, leakage, the flow resistance of the filter, the temperature of the gas being pumped, and so on. In fact, safety factors should also be taken into account.
The vacuum pump is a rotary positive-displacement vacuum pump that must be used with a foreline pump in order to use it in a wider pressure range. Larger pumping speed is not sensitive to dust and water vapor in the pumped gas. Widely used in metallurgy and chemical industry , food, electronic coating and other industries.