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:
Feb. 05, 2008
Filed:
Apr. 28, 2006
Jussi Ahlroth, Jämsä, FI;
Heikki Manninen, Vilppula, FI;
Jussi Ahlroth, Jämsä, FI;
Heikki Manninen, Vilppula, FI;
Sulzer Pumpen AG, Winterthur, CH;
Abstract
The present invention relates to a centrifugal pump and an impeller thereof. The present invention especially relates to modifying an impeller of a centrifugal pump in such a way that the pump may be used without a risk of damaging a shaft seal or the like at capacities higher than that at the optimal operating point. A characterizing feature of a centrifugal pump, comprising a pump volute (), a rear wall () of the pump, an impeller () having a shroud () and balancing holes extending through the shroud, the impeller being attached on the pump shaft () and rotating inside the volute (), is that the balancing holes () are arranged through the shroud () in such a way that an opening () of the holes () in the front face of the impeller shroud () is both in the rotational direction and ahead of an opening () located in the rear face of the impeller shroud () and closer to the axis () of the pump than the opening () in the rear face of the impeller shroud ().