Choose the right vacuum pump
Nov 11, 2021| Choose the right vacuum pump
In order to obtain high vacuum or ultra-high vacuum efficiently, it is necessary to choose at least one vacuum pump as the main pump. There are many kinds of vacuum pumps, and it is not easy to choose the right vacuum pump to obtain the best performance and save budget as much as possible. Molecular pumps, pumped by high-speed rotating blades or traction discs, can operate at relatively high pressures and provide stable pumping rates in high and ultra-high vacuums. Their disadvantages are vibration, reduced pumping rates for light gases, and sensitivity to mechanical shocks and particulate pollution Ion pump, is the capture vacuum pump because they have no moving parts, the reliability is very high, the work is completely no vibration; It has a long life and requires little maintenance; In addition, ion pumps can withstand high radiation and magnetic interference. By removing the magnet, they can be baked to 450 C, which is essential for some ultra-high vacuum systems. In practical applications, for ultra-high vacuum applications with few breaks, it is generally recommended to choose bipolar ion pumps; Stargell ion pump is recommended for other applications. Titanium sublimation pump and NEG getter pump, respectively, the use of sublimation out of fresh titanium film and suction material adsorption active gas to pump, the pumping speed of the active gas is very large, and the inert gas has no pumping speed at all In addition, because of the total pumping capacity, both pumps are better suited to operate in ultra-high vacuums with low gas volumes, especially the NEG getter pump, which requires high-temperature activation when its capacity is depleted. During activation, previously adsorbed gas is released, which means that the ultra-high vacuum of the system is destroyed The Stargell ion pump is often used in combination with titanium sublimation pump or NEG getter pump, which has a higher pumping ratio to hydrogen, to achieve better vacuum After the confirmation of the main pump, select the appropriate front stage pump according to the characteristics and requirements of the main pump, such as diaphragm pump, scroll pump, turbo molecular pump, etc. In order to avoid the pollution of oil vapor, the oil-free vacuum pump is generally selected for the high vacuum and ultra-high vacuum system
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