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. 10, 2019
Filed:
Jan. 25, 2017
Grundfos Holding A/s, Bjerringbro, DK;
Erik Bundesen Svarre, Bjerringbro, DK;
John Frigård Nielsen, Fårup, DK;
GRUNDFOS HOLDING A/S, Bjerringbro, DK;
Abstract
A multi-stage centrifugal pump includes pump stages (), with impellers () arranged on a rotatable shaft () arranged within a pump casing. The shaft passes through a chamber (), provided within the pump casing, and is sealingly led out of the pump casing for connection to a drive motor (). A shaft ring () is fixedly and sealingly connected to the shaft () and has one side, at least in sections, that is subjected to the pressure of the pump and is arranged in or on the shaft. An axial seal () is provided with a rotating part formed by the shaft ring () or a seal part () arranged thereon and with a non-rotating part formed by a counter-ring () or a seal part which is arranged thereon. The counter-ring () is radially sealed with respect to the chamber () and is axially movably guided within the chamber.