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:
Mar. 31, 2020
Filed:
Feb. 12, 2015
Applicant:
Ebm-papst St. Georgen Gmbh & Co. KG, St. Georgen, DE;
Inventors:
Assignee:
ebm-papst St. Georgen GmbH & Co. KG, St. Georgen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04D 29/66 (2006.01); F04D 29/16 (2006.01); F04D 29/32 (2006.01); F04D 29/38 (2006.01);
U.S. Cl.
CPC ...
F04D 29/666 (2013.01); F04D 29/164 (2013.01); F04D 29/327 (2013.01); F04D 29/328 (2013.01); F04D 29/384 (2013.01); F04D 29/663 (2013.01); F05D 2240/307 (2013.01);
Abstract
A fan has an impeller () that is equipped with blades (). The blades are configured so that the blade loading of individual blades differs during operation. As a result of this variable blade loading, the frequencies associated with the blade-passing noise (BPF) of the fan can be distributed over a broader frequency spectrum, and thus have a less obtrusive effect.