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:
Mar. 15, 1988
Filed:
Jun. 17, 1987
Robert Kervistin, Le Mee sur Seine, FR;
Abstract
A blade root sockets provided in the discs of a turbine rotor have passages for cooling air which are arranged to be variably blocked by closure means carried by the upstream and downstream ends of the labyrinth carriers disposed between the discs. The labyrinth carriers are of the pin-like type and are able to expand and contract in response to the temperature of the gas flow passing through the turbine, moving the closure means to open or close the passages. The positions of the closure means adjacent the passages are determined by the relative dimensions and the thermal expansion coefficients of the discs and the labyrinth carriers, and may be chosen to provide full cooling air flow during engine acceleration, a reduced flow during stable operation, and a very restricted flow to the first disc only during deceleration.