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:
Sep. 24, 1991
Filed:
Mar. 27, 1989
Daniel Fleury, Nanteuil Le Haudouin, FR;
Alsthom S.A., Paris, FR;
Abstract
A method of assembling a rotor of a steam turbine constituted by disks (2) shrunk onto a shaft, said disks (2) being provided with cavities (4) facing one another and having female pegs (5) disposed in said cavities in one disk (2) and male pegs (6) disposed in the facing cavities (4) of an adjacent disk (2) with each of the disks (2) being shrunk on while disposing the male pegs (6) of said disks into the female pegs (5) of the already shrunk-on adjacent disk, the method being characterized in that spacer means (12) are provided in the female pegs (5) prior to inserting the male pegs (6) in the female pegs (5) so that the male pegs (6) do not come into contact with the female pegs (5), with the spacer means (12) subsequently being removed. A fork for use in the method of the invention and in conjunction with a male peg (6) comprising a tenon (8 ) having two walls parallel to the axis of the rotor and at a spacing a, and a female peg (5) having a complementary slot (10) with two walls parallel to the walls of the tenon (8) and at a spacing of a+2d, the fork being characterized in that it comprises a handle (13) and two tines (14) of thickness slightly less than d, with the outside edges (15) being at a spacing of a+2d and which are capable of being disposed against the walls of the slot (10). By keeping associated pegs spaced apart during assembly and overspeed testing, it is possible to avoid stress corrosion during operation.