Turbomolecular Pumps

Turbomolecular Pumps

Turbomolecular pumps are high-vacuum pumps that are widely used in various scientific and industrial applications. They operate by using a combination of high-speed rotating blades and stationary stator blades to transfer gas molecules from the inlet to the outlet of the pump. The blades are arranged in a series of stages, each of which increases the velocity of the gas molecules and reduces their pressure. The final stage of the pump typically uses a specially designed rotor that has a series of angled blades that impart a tangential velocity to the gas molecules, which causes them to spiral outwards towards the outlet of the pump. Turbomolecular pumps are capable of achieving extremely high vacuum levels, typically in the range of 10^-10 to 10^-12 mbar. They are commonly used in applications such as semiconductor manufacturing, surface analysis, and vacuum coating. They are also used in research applications such as particle accelerators and synchrotrons. One of the advantages of turbomolecular pumps is their ability to operate without the need for lubrication. This is because the blades are typically made from materials such as titanium or ceramics, which have a low coefficient of friction and are resistant to wear. This makes them ideal for use in high-vacuum applications where contamination from lubricants must be avoided. However, one of the limitations of turbomolecular pumps is their susceptibility to damage from backstreaming. Backstreaming occurs when gas molecules that have been pumped out of the vacuum chamber are able to diffuse back into the pump and condense on the blades. This can cause the blades to become coated with a layer of condensed gas, which can reduce the pumping speed and ultimately cause the pump to fail. In summary, turbomolecular pumps are a type of high-vacuum pump that use a combination of high-speed rotating blades and stationary stator blades to transfer gas molecules from the inlet to the outlet of the pump. They are capable of achieving extremely high vacuum levels and are commonly used in scientific and industrial applications. However, they are susceptible to damage from backstreaming, which can reduce their performance and ultimately cause them to fail.

high-vacuum, pumping speed, backstreaming, semiconductor manufacturing, synchrotrons

— Christopher White

CITATION : "Christopher White. 'Turbomolecular Pumps.' Design+Encyclopedia. https://design-encyclopedia.com/define/turbomolecular-pumps?E=261690 (Accessed on October 14, 2026)"