Exposition

Turbomolecular drag pump

Exhibit no. 490

A turbomolecular pump is a type of a kinetic pump used to obtain and maintain a high vacuum. 

The pump consists of multiple stages, each containing a quickly rotating rotor blade and stationary stator blade pair. The rotating blades impact the incoming gas molecules and transfer the mechanical energy into gas molecule momentum that is directed from the inlet. The gas is compressed from stage to stage through the pump to the exhaust port, where it is drawn off by the backing pump. Modern turbomolecular pumps have a Holweck pump as their last stage to increase the maximum backing pressure; these kinds of pumps are termed turbo drag pumps. Due to the rotation of the rotor gas molecules receive a stimulus velocity in the direction of a helical channel. The picture shows an interior view of a turbomolecular drag pump TMH 071 P manufactured by Pfeiffer Vacuum. The unit with hybrid bearings (magnetic and oil-lubricated ball bearing) and a Holweck stage works at a rotation speed of 90 000 rpm with attainable final pressure 1.10-7 mbar.

The exhibit comes from a quadrupole mass spectrometer Agilent 5975C MSD manufactured in 2009.

Wikipedia: Turbomolecular pump

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