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:
Oct. 09, 2001
Filed:
Feb. 11, 2000
Dieter Freuschle, Waldshut, DE;
Siegfried Hohmann, Waldshut, DE;
ABB Alstom Power (Schweiz) AG, Baden, CH;
Abstract
Moving blades of a fluid-flow machine are fastened in a circumferential slot on the rotor by means of blade roots. For the installation of the last moving blade, a gap is provided between the first and penultimate blade. After the latter has been fitted, a residual gap remains in the circumferential slot, and this residual gap is filled by means of whole intermediate pieces and halved intermediate pieces (,), which are arranged between the moving-blade roots. According to the invention, the inner sides (,) of the halved intermediate pieces (,), which inner sides (,) face the center of the circumferential slot, are of hook-shaped design. In this case, the inner side (,) of one half (,) of a halved intermediate piece forms the geometric negative of the inner side (,) of the other half (,) of the halved intermediate piece. As a result, the two halves (,) can be connected to one another in a positive-locking manner. Axial forces which act on the side walls of the circumferential slot are reduced by this connection, so that the cross section of the halved intermediate pieces (,) can be produced in a rectangular form and consequently more cost-effectively.