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:
Jul. 04, 2023
Filed:
Dec. 28, 2020
Abb Schweiz Ag, Baden, CH;
Kari Heikfolk, Vaasa, FI;
Christian Vägar, Vaasa, FI;
ABB Schweiz AG, Baden, CH;
Abstract
A sealing arrangement for an electric machine, which is between a first part attached to a rotatable shaft and a second part immobile with respect to a stator of the electric machine includes a plurality of zig-zag sections of a channel of a labyrinth seal in a radial direction of the electric machine. The channel of the labyrinth seal includes a second seal which is fixedly attached to the first part and which has an elastic material part, the second seal is pressed in the radial direction against a surface of the second part, a normal of which has a component parallel to the radial direction, at rotational speeds a centrifugal force of which to the second seal is weaker than a spring force of the second seal, and the second seal opening a gap between the second seal and said surface at rotational speeds the centrifugal force of which to the second seal is greater than the spring force of the second seal.