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. 04, 2001
Filed:
May. 16, 2000
Peter Feigl, Höhenrain, DE;
Bernd Plewnia, Geretsried, DE;
Feodor Burgmann Dichtungswerke GmbH & Co., Wolfratshausen, DE;
Abstract
A face seal assembly comprises a pair of co-operating seal rings of which one is provided for mounting on a rotary component and the other on a stationary component. The seal rings have substantially radially aligned seal faces between which during operation a seal gap is provided for sealing a zone peripherally outward of the seal faces relative to a zone peripherally inward thereof. A plurality of peripherally spaced recesses effective for pumping a gas are provided in at least one of the seal faces, said gas recesses extending from one periphery of the seal face towards, but the of ends said recesses being radially spaced from, the other periphery thereof. A surface area ratio F,/F,g in a range between 0.35 and 0.65, preferably 0.4 and 0.6 is provided on the seal face having said gas recesses. F,is the total surface area of the gas recesses as a projection onto the seal face, and F,is the total surface area of the seal face.