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, 2002
Filed:
Jan. 02, 2001
Peer Springer, Neuhofen, DE;
Wolfgang Kochanowski, Windesheim, DE;
Christian Haag, Halle/Saale, DE;
Thomas Pensler, Langenbogen, DE;
KSB Aktiengesellschaft, Frankenthal, DE;
Abstract
A centrifugal pump with an impeller which has a single helically-formed blade and which is not sensitive to sand abrasion or seizing of the impeller is achieved by providing the impeller ( ) with a shielding plate ( ) arranged on the suction side which transitions from an axial course given at the suction inlet of the impeller into a radial course, by providing that the blade entry angle (&bgr; ) in the area which is in danger of cavitation in the event of an abrupt onset of flow is at least 5° smaller than the angle of incident flow (&bgr; ), and thereafter the blade angle &bgr; in the axial region of a meridian section through the impeller ( ) increases at least to the magnitude of the blade exit angle (&bgr; ), and finally a blade angle (&bgr;) exceeding the blade exit angle (&bgr; ) in the radial area of the meridian section decreases back down to the magnitude of the blade exit angle (&bgr; ).