Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Plural distributing means immediately upstream of runner
Reexamination Certificate
1999-12-29
2001-10-02
Verdier, Christopher (Department: 3745)
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Plural distributing means immediately upstream of runner
C415S209200, C415S209400, C415S210100, C029S889220
Reexamination Certificate
active
06296442
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a turbomachine stator vane set comprising arrangements for fastening the vanes of which it is formed.
The invention is particularly applicable to a stator vane set of a multi-stage turbojet engine.
DISCUSSION OF THE BACKGROUND
Various solutions have been used to fasten the vanes of a turbojet engine stator. Commonly, the vanes are arranged between a radially outer stator shell and a radially inner stator shell which delimit the profile of the duct for the stream flowing through the passage.
FR-A-2 321 616 thus discloses a fastening of the vane end platforms by bolting to the outer shell.
FR-A-2 671 133 also discloses a stator vane set where the vanes are fastened using a sleeve resting against the external surface of the outer shell and crimped onto a rod borne by the end of the vane.
SUMMARY OF THE INVENTION
The objective of the invention is to provide an alternative solution which makes it easier to fasten the vanes of a stator vane set. One of the objects of the invention is also to immobilize the vanes of the stator vane set to prevent them from rotating during mounting and in operation.
The objective is achieved according to the invention by the fact that the outer shell has a housing, the bottom of which has a non-planar surface, which is spherical or cylindrical with a radius of curvature R, into which are inserted the platforms of the vanes, the cooperating surface of which has a corresponding non-planar shape which is spherical or cylindrical with a larger radius of curvature R+delta R prior to fitting and which is reduced to the radius R under stress, by the action of fastening rivets used to assemble the vane platforms with the outer shell.
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patent: 4722184 (1988-02-01), Chaplin et al.
patent: 4832568 (1989-05-01), Roth et al.
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Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Techspace Aero
Verdier Christopher
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