US 6,981,847 B2 | ||
System for connecting and locking rotor blades of an axial compressor | ||
Paolo Arinci, Florence (Italy); and Carlo Bacciottini, Siena (Italy) | ||
Assigned to Nuovo Pignone Holding S.p.A., Florence (Italy) | ||
Filed on Dec. 16, 2002, as Appl. No. 10/319,462. | ||
Claims priority of application No. MI2001A2783 (IT), filed on Dec. 21, 2001. | ||
Prior Publication US 2004/0037703 A1, Feb. 26, 2004 | ||
Int. Cl. F01D 5/32 (2006.01) |
U.S. Cl. 416—193A | 7 Claims |
1. A system for connecting and locking blades in an axial compressor, comprising:
a rotor disc having a circumferentially extending seat with a shaped profile formed about the circumference of the rotor disc,
said shaped profile of said seat including axially opposed projections radially outwardly of axially opposed recesses adjacent
a base of the seat, said seat base including at least one blind hole;
a plurality of blades circumferentially adjacent one another about the circumference of the rotor disc, each blade having
an airfoil, a platform and a shaped root for connection to the rotor disc and reception in said seat, each said root having
opposite flat sides in circumferential directions of said disc;
at least one block having a lateral profile with rounded corners, formed by a pair of recesses in a radial outer portion of
the block for retention by the axially opposed projections of said seat, said block having a pair of projections in a radial
inner portion thereof for reception in the axially opposed recesses of said seat, said block having a central generally radially
extending through hole and opposite flat sides in circumferential directions of said disc;
a dowel for partial reception in said hole and having a body and a head, said block being received in said seat between a
pair of next adjacent blades with said dowel head received in part in said blind hole to fix the block to the rotor disc against
circumferential movement about the circumference of the rotor disk;
each said platform is quadrangular in shape, each said platform having a width in the circumferential direction of said rotor
disc essentially equal to twice the thickness of the shaped roots of said blades in said circumferential direction, the width
being essentially equal to twice the thickness of said one block, whereby in assembly of the blades a space is defined between
adjacent blades sufficient to receive said one block.
|