Vacuum pump and method for generating sub-pressure

Details Vacuum pump and method for generating sub-pressure Vacuum pump and method for generating sub-pressure

2003-04-29

2008-11-18

Kramer, Devon C (Department: 3746)

Pumps

One fluid pumped by contact or entrainment with another

Diverse pumps

C417S080000, C417S085000, C417S087000, C417S163000, C417S165000, C417S169000, C417S170000, C417S199200

Reexamination Certificate

active

07452191

ABSTRACT:
According to the invention, a vacuum pump is disclosed comprising a screw-rotor pump having a compression section (8) and an expansion section (7), and wherein a discharge (10) from the compression section communicates with at least one ejector (1) for discharge of compressed gas through the ejector, and wherein the expansion section (7) is connectable via a first valve means (5), to a drive-gas source (P) for operating the screw,-rotor pump and the ejector in parallel. Also, a method for providing sub-pressure to an industrial process is disclosed wherein at least one ejector (1) is used initially to reduce the pressure to a predetermined lower level, from where the pressure is further reduced by means of a screw-rotor pump (7, 8) that is arranged to operate through, and in parallel with the ejector.

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patent: 2005/0083654 (2005-04-01), Tsoi
patent: 1234982 (2002-08-01), None
patent: 517211 (2002-05-01), None

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