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Interior view of a turbomolecular pump. A turbomolecular pump is a type of vacuum pump, superficially similar to a turbopump, used to obtain and maintain high vacuum. [1] [2] These pumps work on the principle that gas molecules can be given momentum in a desired direction by repeated collision with a moving solid surface.
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The turbomolecular pump overcame many of these disadvantages. Many modern turbomolecular pumps contain built-in molecular drag stages, which allows them to operate at higher foreline pressures. As a stage in turbo molecular pumps, the most widely used design is the Holweck type, due to a significantly higher pumping speed than the Gaede design.
Generally, axial pumps tend to give much lower pressures than centrifugal pumps, and a few bars is not uncommon. Their advantage is a much higher volumetric flowrate. For this reason they are common for pumping liquid hydrogen in rocket engines, because of its much lower density than other propellants which usually use centrifugal pump designs.
The article Edwards' IPUP2 Vacuum Pump Sets New Standards for Load Lock and Transfer Chamber Applications originally appeared on Fool.com. Try any of our Foolish newsletter services free for 30 days .
An oil diffusion pump is used to achieve higher vacuum (lower pressure) than is possible by use of positive displacement pumps alone. Although its use has been mainly associated within the high-vacuum range, down to 1 × 10 −9 mbar (1 × 10 −7 Pa), diffusion pumps today can produce pressures approaching 1 × 10 −10 mbar (1 × 10 −8 Pa) when properly used with modern fluids and accessories.
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