ADJUSTING DEVICE AND METHOD FOR ADJUSTING A GUIDE GRID OF A TURBOMACHINE

Abstract

The present invention relates to an adjusting device for adjusting guide vanes of a guide vane cascade of a turbomachine, in particular of a turbine stage or a compressor stage of a gas turbine, wherein the adjusting device comprises a coupling ring for coupling the guide vanes and at least two actuators for rotating the coupling ring, said actuators being connected to the coupling ring, wherein at least one of these actuators has a disconnection coupling.

Claims

1. An adjusting device for adjusting guide vanes of a guide vane cascade of a turbomachine, wherein the adjusting device comprises a coupling ring for coupling the guide vanes and at least two actuators for rotating the coupling ring, said actuators being connected to the coupling ring, wherein at least one of these actuators has a disconnection coupling.

2. The adjusting device according to claim 1, wherein the adjusting device comprises at least three actuators for rotating the coupling ring, the actuators being connected to the coupling ring, wherein at least one of these actuators has a disconnection coupling.

3. The adjusting device according to claim 2, wherein the adjusting device comprises four or more actuators for rotating the coupling ring, the actuators being connected to the coupling ring, wherein at least one of these actuators has a disconnection coupling.

4. The adjusting device according to claim 1, wherein the coupling ring is centered, spoke-centered, in a housing of the turbomachine, and/or by the at least three actuators.

5. The adjusting device according to claim 1, wherein at least one disconnection coupling of an actuator can be opened and/or can be closed actively by electricity, hydraulics or pneumatics and/or being configured load-free and/or under load.

6. The adjusting device according to claim 1, wherein at least one load sensor for detects a load in one of the actuators or in a coupling between one of the actuators and the coupling ring.

7. The adjusting device according to claim 1, wherein the adjusting device is configured and arranged to adjust a plurality of guide vanes in a guide vane cascade for a turbomachine.

8. The adjusting device according to claim 7, wherein at least one guide vane cascade is provided in the turbomachine.

9. The adjusting device according to claim 7, wherein at least two of the actuators of the adjusting device are controlled based on detected positions of the actuators and/or loads in the actuators and/or in the couplings between the actuators and the coupling ring, and/or in that at least one disconnection coupling of one actuator will be opened if a predefined state of this actuator is detected or prognosticated.

10. The adjusting device according to claim 9, wherein a predefined state of this actuator is detected, if a detected position and/or change in position of this actuator and/or a detected load and/or change in load in this actuator and/or the coupling between this actuator and the coupling ring lies outside a predefined tolerance range.

11. The adjusting device according to claim 7, wherein at least two of the actuators of the adjusting device based on detected positions of the actuators and/or loads in the couplings between the actuators and the coupling ring, and/or for opening at least one disconnection coupling of an actuator, if a predefined state of this actuator is detected or prognosticated.

Description

BRIEF DESCRIPTION OF THE DRAWING FIGURES

[0045] Additional advantageous enhancements of the present invention can be taken from the dependent claims and the following description of preferred embodiments. For this purpose and partially schematized:

[0046] FIG. 1 shows a guide vane cascade of a turbomachine having an adjusting device according to one embodiment of the present invention;

[0047] FIG. 2 shows an actuator of the adjusting device; and

[0048] FIG. 3 shows a method for controlling the adjusting device according to one embodiment of the present invention.

DESCRIPTION OF THE INVENTION

[0049] FIG. 1 shows a guide vane cascade of a turbomachine having an adjusting device in order to adjust guide vanes 1 of the guide vane cascade of the turbomachine according to one embodiment of the present invention, wherein the adjusting device comprises a coupling ring 2, to which the guide vanes 1 are coupled by vane lever mechanisms 3 in such a way that a rotation of the coupling ring 2 around a (main) machine axis of the turbomachine (perpendicular to the plane of the drawing of FIG. 2) rotates the guide vanes 1 around their vane longitudinal axes (dot-dash lines in FIG. 1), and six actuators 10 for rotating the coupling ring 2, these actuators being connected to the coupling ring via actuator lever mechanisms 11, and are arranged in a housing (not shown).

[0050] Each of the actuators 10, which have at least essentially the same structure, comprises an electrical drive motor 12, a play-free reduction gear 13 and a disconnection coupling 14, which can be actively opened by an adjustment means 15 both under load and also when load-free.

[0051] The coupling ring 2 is spoke centered by the six actuators 10, and for this purpose is mounted displaceable radially and spherically on the actuator lever mechanisms 11 thereof.

[0052] In each case, a load sensor 16 with at least one DMS is arranged on the actuator lever mechanism 11, in order to detect a load in the coupling between the particular actuator and the coupling ring.

[0053] A control 20 redundantly controls the actuators 10 based on positions of the actuators detected by means of rotation sensors 17, and loads in the couplings between the actuators and the coupling ring by means of load sensors 16, in particular based on a comparison of the positions and loads.

[0054] Due to the static overdetermination of the spoke centering, in this case, the control 20 can detect blocked drives and in this case, i.e., if a defective state of the actuator is detected (S10: Y), it opens the disconnection coupling thereof in a step S20 of a method for controlling the adjusting device according to one embodiment of the present invention.

[0055] For this purpose, in step S10, the control 20 checks whether one or more of the detected loads lies (lie) outside a predefined tolerance range or a predefined bandwidth, in this case detects the one or more corresponding drive(s) as blocked or defective, and correspondingly opens the disconnection coupling(s) belonging thereto.

[0056] Although exemplary embodiments were explained in the preceding description, it shall be noted that a plurality of modifications is possible. In addition, it shall be noted that the exemplary embodiments only involve examples that in no way shall limit the scope of protection, the applications, and the construction. Rather, a guide is given to the person skilled in the art by the preceding description for implementing at least one exemplary embodiment, whereby diverse changes, particularly with respect to the function and arrangement of the described components, can be carried out without departing from the scope of protection, as it results from the claims and combinations of features equivalent to these.