Reduced pressure balancing of a turbine rotor
The present invention relates to a device for inserting a balancing weight into a rotor of a turbine, that includes an external component and an internal component. The internal component is connected in a helical manner to the external component. The internal component delimits a chamber which has a first and a second opening, a lower surface which is provided with a sealing joint and a cap in order to close in a tight manner the first opening of the chamber. The connection between the external component and the internal component is helical, that is to say, the result of a threading operation. Therefore, the internal component can thus move in a coaxial manner with respect to the external component.
1. A device for inserting a balancing weight into a rotor of a turbine, the device comprising:
an external component, and
an internal component which is connected in a helical manner to the external component, wherein the internal component moves coaxially with respect to the external component,
wherein the internal component delimits and surrounds a chamber which has a first opening and a second opening, and wherein the internal component comprises:
a lower surface provided with a sealing joint, wherein the sealing joint is at a side of the second opening; and
a cap configured to close in a tight manner the first opening of the chamber.
2. The device according to claim 1 , wherein the sealing joint is planar and covers at least a portion of the lower surface around the second opening of the chamber.
3. The device according to claim 1 , wherein the cap is retained on the first opening of the chamber by at least two screws.
4. The device according to claim 1 , further comprising at least one guiding member configured to guide the internal component relative to the external component.
5. The device according to claim 1 , wherein the helical connection, between the internal component and the external component, constitutes a nut.
6. A turbine comprising:
at least one rotor which has at least one balancing hole, further comprising the device for inserting the balancing weight according to claim 1 .
7. The turbine according to claim 6 , wherein the device for inserting the balancing weight, is fixed to an external housing of the turbine.
8. The turbine according to claim 6 , wherein the at least one balancing hole is at least partially threaded.
9. A method for inserting a balancing weight into a rotor of a turbine using a device according to claim 1 , wherein the method includes the successive steps of:
stopping the turbine;
orienting the rotor so that a balancing hole is opposite the second opening of the chamber of the device;
bringing a surface of the sealing joint, at the side of the second opening of the internal component, in contact with the rotor by use of a nut;
opening the chamber of the device by acting on the at least two screws so as to remove the cap which closes the first opening of the chamber thereby filling the chamber with air;
introducing a weight into the balancing hole of the rotor via the chamber of the device, positioning the weight by means of screwing and locking the weight into position by means of caulking in the balancing hole that co-operates with a thread present on the weight;
repositioning the cap so as to close the first opening of the chamber;
using the nut to disconnect the device from the rotor; and
returning the turbine into operation.
10. The device according to claim 1 , wherein the sealing joint is configured to provide contact between the lower surface and the rotor.
11. The device according to claim 1 , wherein the internal component is configured to move in translation relative to the external component in order to connect or disconnect the device from the rotor of the turbine.