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:
Jan. 20, 1998
Filed:
Nov. 16, 1995
Applicant:
Inventors:
Peter Ernst, Niederglatt, CH;
Jakob Rhyner, Zurich, CH;
Assignee:
ABB Research Ltd., Zurich, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01D / ;
U.S. Cl.
CPC ...
415 10 ;
Abstract
In a device for damping blade vibrations of an axial-flow turbomachine, the ends of the rotating blades form a seal toward the flow-limiting wall of a turbine casing. A ring of permanently magnetic material is attached to this flow-limiting wall of the turbine casing in the radial direction opposite the blade ends, which ring consists of at least one or more sectional rings of the same or different magnetic polarization. The blade ends are each provided with a cover plate which is made of a material which is a good electrical conductor.