Vacuum Pump Pumping Principle

Since the development of vacuum technology to such a wide pressure range, people have not developed a pump that can pump a container from the atmosphere to a high vacuum or ultra-high vacuum range.

Although all vacuum pumps are designed to reduce the number of gaseous molecules, the various types of pumps used to obtain low pressure involve several different principles. Vacuum pumping is based on one or more of the following principles.

Gas compression and expansion, used in piston pump, liquid column pump or water ring vacuum pump, rotary vane vacuum pump, Roots vacuum pump.

The drag force produced by the viscous effect is applied to the sub-steam jet pump.

The drag force produced by the diffusion effect is applied to the vapor diffusion pump.

Molecular drag force is used in molecular pumps.

Ionization effect is used in ion pump.

Physical or chemical suction is used in adsorption pumps, cryopumps and suction processes.

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