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. 15, 2015
Filed:
May. 11, 2012
Paul Krampe, Essen, DE;
Thomas Hinners, Essen, DE;
Paul Krampe, Essen, DE;
Thomas Hinners, Essen, DE;
Hugo Vogelsang Maschinenbau GmbH, Essen, DE;
Abstract
The invention relates to an apparatus for sealing a pump chamber of a rotary lobe pump vis-a-vis a fluid-free region of the rotary lobe pump, in particular in the region of a shaft duct, wherein the apparatus has two or more sealing elements, which can be disposed adjacent to a front side of a rotary piston disposed on a shaft in the pump chamber of the rotary lobe pump in such a way that a labyrinth gap extends between the sealing elements, said labyrinth gap being arranged in a radial direction relative to the shaft and in an axial direction in order to extend the seal land. According to the invention, the seal land is larger in a radial direction relative to the shaft than the seal land in an axial direction relative to the shaft.