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. 24, 2012
Filed:
Apr. 22, 2009
Mathieu Caucheteux, Creteil, FR;
Francois Maurice Garcin, Paris, FR;
Jean-pierre Francois Lombard, Pamfou, FR;
Nicolas Christian Triconnet, Saint Fargeau Ponthierry, FR;
Mathieu Caucheteux, Creteil, FR;
Francois Maurice Garcin, Paris, FR;
Jean-Pierre Francois Lombard, Pamfou, FR;
Nicolas Christian Triconnet, Saint Fargeau Ponthierry, FR;
SNECMA, Paris, FR;
Abstract
A cylindrical casing for a turbomachine that is suitable for receiving a rotor fitted with at least one bladed wheel is disclosed. The casing includes a device for preventing instability during contact between the casing and the bladed wheel. The device includes a succession of elements disposed around the circumference of the casing, and presenting different stiffnesses between two adjacent elements. The number of elements having the same stiffness not being equal to a multiple of the wave number of the vibratory mode of the bladed wheel that is to be inhibited. The invention is applicable to a compressor, a turbine, or a fan.