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Most turbomolecular pumps employ multiple stages, each consisting of a quickly rotating rotor blade and stationary stator blade pair. The system is an axial compressor that puts energy into the gas, rather than a turbine, which takes energy out of a moving fluid to create rotary power, thus "turbomolecular pump" is a misnomer.
Pfeiffer Vacuum Technology AG is a German manufacturer of vacuum pumps. [1] It is headquartered in Aßlar in Germany with 70% of the total production catering to the export market. In July 1996 the company was listed on the NYSE and in April 1998 on the TecDAX. Due to low trading volumes, it was de-listed from the NYSE in October 2007. [2]
The newly emerged dry pumps and turbomolecular pumps supported innovation in the scientific instrument markets over the next couple of decades. The scientific instrument market is now the second biggest market for Edwards Vacuum, after the semiconductor and electronics industry.
In general, molecular drag pumps are more efficient for heavy gasses, so the lighter gasses (hydrogen, deuterium, helium) will make up the majority of the residual gasses left after running a molecular drag pump. [4] The turbomolecular pump invented in the 1950s, is a more advanced version based on similar operation, and a Holweck pump is often ...
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.
A cutaway view of a turbomolecular high vacuum pump. In a momentum transfer pump (or kinetic pump [16]), gas molecules are accelerated from the vacuum side to the exhaust side (which is usually maintained at a reduced pressure by a positive displacement pump). Momentum transfer pumping is only possible below pressures of about 0.1 kPa.
Ion pumps are commonly used in ultra-high vacuum (UHV) systems, as they can attain ultimate pressures less than 10 −11 mbar. [1] In contrast to other common UHV pumps, such as turbomolecular pumps and diffusion pumps, ion pumps have no moving parts and use no oil. They are therefore clean, need little maintenance, and produce no vibrations.
Elliott Company designs, manufactures, installs, and services turbo-machinery for prime movers and rotating machinery. Headquartered in Jeannette, Pennsylvania, Elliott Company is a wholly owned subsidiary of the Japan-based Ebara Corporation, and is a unit of Elliott Group, Ebara Corporation's worldwide turbomachinery business.