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:
Apr. 06, 2004
Filed:
Oct. 15, 2002
Eugenio Rossi, Viareggio, IT;
Antonio Pelagotti, Sesto Fiorentino, IT;
Nuovo Pignone Holding S.p.A., Florence, IT;
Abstract
Stator blading ( ) of return channels for two-dimensional centrifugal stages of a multi-stage centrifugal compressor with improved efficiency, of the type comprising a plurality of blades ( ) disposed circumferentially equally spaced on a ring ( ) which surrounds a rotor of the compressor, these blades ( ) each having a cross-section in the shape of a half-moon formed by a concave area ( ) and a convex area ( ), these concave ( ) and convex ( ) areas being connected to one another such as to determine a trailing edge ( ) and a leading edge ( ) on an inner radius (R); the profile of the concave area ( ) of each blade ( ) is produced by connecting to one another points which have particular Cartesian co-ordinates relative to a system of axes which are at right-angles to one another, of x-co-ordinates (X) and y-co-ordinates (Y) with an origin (O) located on the axis of rotation.