The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 26, 2006
Filed:
Feb. 18, 2003
Thomas Dreifert, Kerpen, DE;
Wolfgang Giebmanns, Erfstadt, DE;
Hans-rochus Gross, Bergisch Gladbach, DE;
Hartmut Kriehn, Köln, DE;
Thomas Dreifert, Kerpen, DE;
Wolfgang Giebmanns, Erfstadt, DE;
Hans-Rochus Gross, Bergisch Gladbach, DE;
Hartmut Kriehn, Köln, DE;
Leybold Vacuum GmbH, Colonge, DE;
Abstract
A vacuum pump () comprises at least one rotor shaft () having a rotor section () with a rotor (), a bearing section () with a bearing (), and a shaft sealing system () that is axially situated between the rotor section () and the bearing section (). The shaft sealing system () axially comprises, on the side of the rotor, a gas seal () and, on the side of the bearing, an oil seal (). The shaft sealing system () additionally comprises, between the gas seal () and the oil seal (), a separating chamber, which surrounds the rotor shaft () and is ventilated by at least one separating chamber ventilation duct (). This enables the pressure difference that decreases via the gas seal and the pressure difference that decreases via the oil seal to be adjusted. An appropriate adjustment can prevent oil on the bearing side from passing through the oil seal toward the separating chamber.