Balancing screw, device and method for a rotating part of a turbine engine
View Patent ↗A balancing device for a rotating part of a turbomachine, includes a ferrule pierced with a plurality of ports, a balancing screw passing through each port, each balancing screw including a body and a head, the head of each balancing screw being pierced with a recess, the balancing screws being of at least one first type, the recess of the screws of the first type being formed by a driving recess from which an additional recess extends.
1. A balancing device for a rotating part of a turbomachine, comprising a ferrule pierced with a plurality of ports, and a balancing screw passing through each port of the plurality of ports, each balancing screw including a body and a head, the head being pierced with a recess, wherein the balancing screws are of a first type and a second type, wherein the recess of the balancing screw of the first type is formed by a driving recess and by an additional recess, the driving recess having a bottom, the bottom of the driving recess being pierced with the additional recess, and wherein the recess of the balancing screw of the second type is formed only by a second driving recess.
2. The balancing device according to claim 1 , wherein:
the balancing screws of the first type are made of a material having a first density m 1 ,
the balancing screws of the second type are made of a material having a second density m 2 , m 2 being strictly higher than m 1 .
3. The balancing device according to claim 2 , wherein:
the balancing screws of the first type are made of titanium;
the balancing screws of the second type are made of steel.
4. The balancing device according to claim 1 , wherein:
the screws of the first type have a length l 1 ;
the screws of the second type have a length l 2 , l 2 >l 1 .
5. The balancing device according to claim 1 , wherein the balancing screw heads are cylindrical.
6. The balancing device according to claim 1 , wherein:
the head of each balancing screw of the first type has a mass at least equal to 60% of a total mass of said balancing screw; and/or
the head of each balancing screw of the second type has a mass at least equal to 40% of a total mass of said balancing screw.
7. The balancing device according to claim 1 , further comprising additional balancing screws, each additional balancing screw having a mass between the mass of one of the screws of the first type and the mass of one of the screws of the second type.
8. A method for balancing a rotating part of a turbomachine provided with the balancing device according to claim 1 , the method comprising adjusting a depth of the recess of the balancing screw of the first type and/or the recess of the balancing screw of the second type so as to balance the rotating part.
9. The balancing method according to claim 8 , further comprising adjusting one or more of the following parameters to balance the rotating part:
external dimensions of each of the heads;
a shape of the screw heads;
a material of the balancing screws.