Guide vane adjustment device and turbine

Abstract

A guide vane adjustment device for a turbomachine, i.e. For twisting a plurality of guide vanes combined into a guide vane ring extending in a radial direction, around the axis of rotation of the guide vanes of the guide vane ring, in which each guide vane comprises a front vane part and a rear vane part that can be twisted relative to each other. A drive assembly having a first drive hub coupleable to and drivable by the first drive motor; and having a first control ring that transmits a torsion of the first drive hub of the front vane member for twisting the guide vanes of the guide vane ring to the front vane member. A second drive hub coupleable to and drivable by the second drive motor; and having a second control ring that transmits a torsion of the second drive hub to the aft vane member for twisting the aft vane member independently of a torsion of the front vane member of the guide vanes of the guide vane ring.

Description

Technical Field

[0001] The invention relates to a guide vane adjustment device for a turbomachine and to a turbomachine having a guide vane adjustment device. Background Art

[0002] A turbine known from practice has a rotor and a stator. The rotor of the turbine comprises a shaft and a plurality of movable blades rotating with the shaft, wherein the movable blades form at least one movable blade ring. The stator of the turbine comprises a housing and a plurality of fixed guide blades, wherein the guide blades form at least one guide blade ring. The guide blades known from practice are embodied in one piece. It is known from practice to adjust the one-piece guide blades of a movable blade ring of a turbine via a guide blade adjustment device in such a way that the guide blades can rotate about an axis of rotation extending in the radial direction of the rotor.

[0003] DE 102015004649A1 discloses a guide vane adjustment device for twisting guide vanes, which is implemented as two parts. Accordingly, each guide vane includes a front blade part and a rear blade part, wherein the front blade part and the rear blade part can be twisted and thus adjusted together via a common control ring. The common drive hub interacts with the common control ring. Starting from the common drive hub, one of the guide vanes of the guide vane ring can be directly adjusted, wherein the other guide vanes of the guide vane ring issued from the drive hub can be indirectly adjusted via the common control ring.

[0004] According to DE 102015004649A1, the two blade parts of each moving blade can only be twisted due to the repositioning of their coupling and are therefore adjusted based on a fixed adjustment law that depends on the coupling mechanism. It is not possible to adjust the front blade part and the rear blade part independently of each other. Therefore, the efficiency of the turbine can also be increased only to a limited extent. Summary of the invention

[0005] Starting from this, the invention is based on the object of creating a novel guide vane adjustment device and a turbine having such a guide vane adjustment device.

[0006] This object is achieved by a guide vane adjustment device according to claim 1 and a turbine having such a guide vane adjustment device according to claim 10 .

[0007] The guide vane adjustment device according to the present invention comprises a first drive hub and a first control ring, wherein the first drive hub can be connected to a first drive motor and can be driven via the first drive motor, and the first control ring is used to twist the front blade parts of the guide vanes of the guide vane ring and transmit the twisting of the first drive hub to the front blade parts.

[0008] In addition, the guide vane adjustment device according to the present invention comprises a second drive hub and a second control ring, wherein the second drive hub can be connected to a second drive motor and can be driven via the second drive motor, and the second control ring is used to twist the rear blade part independently of the twisting of the front blade part of the guide vane of the guide vane ring, and transmit the twisting of the second drive hub to the rear blade part.

[0009] In the guide vane adjustment device according to the present invention, two separate drive hubs are used, wherein each of the two separate drive hubs can be connected to a drive motor. In addition, the guide vane adjustment device according to the present invention has two separate control rings. The front blade part of the guide vane can be adjusted via the first drive motor, the first drive hub and the first control ring. The rear blade part can be adjusted independently of the torsion of the front blade part (i.e., independently of the front blade part of the guide vane) via the second drive motor, the second drive hub and the second adjustment ring.

[0010] Accordingly, the two blade parts can be adjusted independently of one another, so that there are no longer fixed adjustment laws that depend on the coupling mechanism.

[0011] Preferably, the first control ring is arranged on a first axial side of the guide blade ring facing the front blade part of the guide blade, and the second control ring is arranged on a second axial side of the guide blade ring facing the rear blade part of the guide blade. This is preferred for simple, independent repositioning of the front blade part and the rear blade part of the guide blade.

[0012] Preferably, the first drive hub is directly coupled to one of the front blade parts of one of the guide blades of the guide blade ring in such a way that the front blade part of this guide blade of the guide blade ring emanating from the first drive hub can be directly twisted without the intervention of the first control ring. The first drive hub is indirectly coupled to the front blade parts of the other guide blades of the guide blade ring in such a way that the front blade parts of the other guide blades of the guide blade ring emanating from the first drive hub can be indirectly twisted with the intervention of the first control ring.

[0013] Preferably, the second drive hub is directly coupled to one of the trailing blade parts of one of the guide blades of the guide blade ring in such a way that the trailing blade part of this guide blade of the guide blade ring emanating from the second drive hub can be directly twisted without the intervention of the second control ring. The second drive hub is indirectly coupled to the trailing blade parts of the other guide blades of the guide blade ring in such a way that the trailing blade parts of the other guide blades of the guide blade ring emanating from the second drive hub can be indirectly twisted with the intervention of the second control ring.

[0014] Preferably, the first drive hub is coupled to the first control ring via a first drive rod and the second drive hub is coupled to the second control ring via a second drive rod, wherein the first drive hub is arranged together with the first drive rod at a first circumferential position and the second drive hub is arranged together with the second drive rod at a second further circumferential position of the guide blade ring. By means of the drive rods, an actuation on the respective drive hub can be transmitted to the respective control ring.

[0015] Preferably, the first control ring of the guide vane adjustment device is each coupled via a first blade lever to a bearing pin of a leading blade part of a respective other indirectly twistable guide vane, wherein the second control ring of the guide vane adjustment device is each coupled via a second blade lever to a bearing pin of a trailing blade part of a respective other indirectly twistable guide vane. The transmission of the actuation from the respective drive hub from the respective control ring to the respective other indirectly twistable guide vane of the guide vane ring occurs via the respective blade lever of the guide vane adjustment device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Preferred further developments of the invention are obtained from the dependent claims and the following description. Exemplary embodiments of the invention are explained in more detail by means of the drawings, but are not limited thereto. The drawings show: Figure 1 A perspective extract from a turbine is shown in the region of a guide blade ring and a guide blade adjustment device for multi-part guide blades of the guide blade ring; Figure 2 Show Figure 1 Details; Figure 3 The first drive hub is shown in the region of the first drive hub. Figure 2 Detail of the cross section; Figure 4 Shows twist in the circumferential direction Figure 1 Extraction diagram of Figure 5 Show Figure 4 Details; Figure 6 The second drive hub is shown in the region of the Figure 5 Detail of the cross section; Figure 7 Show Figure 1 , Figure 4 Details; Figure 8 The guide vane adjustment device is shown in the region of the second blade rod. Figure 7 Detail of the cross section; Fig. 9 The guide vane adjustment device is shown in the region of the first blade rod. Figure 7 Detail of cross section. DETAILED DESCRIPTION

[0017] The basic construction of a turbomachine is familiar to a person skilled in the art. For the sake of completeness, it is explained here that the turbomachine comprises a rotor with rotor-side moving blades and a stator with stator-side guide blades. The moving blades of the rotor form at least one moving blade ring, wherein the or each moving blade ring rotates with the shaft of the rotor. The guide blades of the stator form at least one guide blade ring connected to the stator-side housing.

[0018] The invention relates to a guide vane adjustment device for a guide vane of a stator of a turbomachine and to a turbomachine having at least one such guide vane adjustment device.

[0019] Figure 1 A perspective extract from a turbine is shown, namely a perspective view of a so-called inlet guide device of the turbine, by means of which the flow of the process gas before entering the rotor can be specifically influenced.

[0020] Figure 1 The inlet guide device shown in the embodiment has a guide blade ring 10 with a plurality of guide blades 11, which issue from a housing 12 defining a flow channel and protrude inwardly into the flow channel. Each guide blade 11 is formed by a plurality of parts of a front blade part 13 and a rear blade part 14. Each of the blade parts 13, 14 of each guide blade 11 has a bearing pin 15, 16, wherein in the exemplary embodiment shown, the bearing pin 15 for the front blade part 13 is formed as a hollow pin and the bearing pin 16 for the rear blade part 14 is formed as a solid pin. The bearing pins 15, 16 of each multi-part guide blade 11 extend coaxially with each other in the radial direction, so that the rotation axes of the bearing pins 15, 16 of the blade parts 13, 14 extending in the radial direction coincide in the region of each guide blade 11. In the region of each guide vane 11 , the two blade parts 13 , 14 are therefore rotatable relative to the housing 12 about a common axis of rotation, wherein the axis of rotation extends in the radial direction and is defined by the coaxial axes of the two bearing pins 15 , 16 .

[0021] In order to twist and thus reposition the front blade part 13 and the rear blade part 14 of the guide blade 11 , the guide blade adjustment device 17 interacts with the guide blade ring 10 .

[0022] The guide vane adjustment device 17 comprises a first drive hub 18 which can be coupled to a first drive motor, which is not shown and can be driven via the first drive motor. A first control ring 19 interacts with the first drive hub 18, which transmits the twisting of the first drive hub 18 for twisting the front blade parts 13 of the guide vanes 11 of the guide vane ring 10 to the front blade parts 13.

[0023] The front drive hub 18 is directly coupled to one of the front blade parts 13 of one of the guide blades 11 of the guide blade ring 10, i.e. in such a way that the front blade part 13 of this guide blade 11 of the guide blade ring 10 emanating from the first drive hub 18 can be directly twisted without the intervention of the control ring 19. Accordingly, Figure 3 The first drive hub 18, i.e. the intermediate piece 20 connected to the first drive hub 18, is shown coupled to the bearing pin 15 of the leading blade part 13 of the guide blade 11 shown there without the intervention of the first control ring 19. Accordingly, the guide blade 11 emanating from the first drive hub 18 can be directly twisted and thus repositioned.

[0024] The first drive hub 18 is indirectly coupled to the front blade parts 13 of the other guide blades 11 of the guide blade ring 10, i.e. in such a way that the front blade parts 13 of the other guide blades 11 of the guide blade ring 10 emanating from the first drive hub 18 can be indirectly twisted with the intervention of the first control ring 19. The first drive hub 18 is therefore coupled to the first control ring 19 via the first drive lever 11, so that the actuation of the first drive hub 18 is transmitted to the first control ring 19 via the first drive lever 21. The first control rings 19 are each coupled via the first blade lever 22 to the bearing pin 15 of the front blade part 13 of the respective other guide blade 11 of the guide blade ring 10 which can be indirectly twisted via the first control ring 19.

[0025] A twisting of the first drive hub 18 thus leads to a direct twisting of the front blade part 13 of an individual guide blade 11 and likewise to a twisting of the first control ring 19 and, via the first control ring 19 , to a twisting of the first blade parts 13 of all other guide blades 11 .

[0026] The guide vane adjustment device 17 further comprises a second drive hub 23, which is coupled to a second drive motor, also not shown, and can be driven via the second drive motor. A second control ring 24 interacts with the second drive hub 23. The second control ring 24 transmits the torsion of the second drive hub 23, which is used to twist the rear blade part 14 independently of the torsion of the front blade part 13 of the guide vane 11 of the guide vane ring 10, to the rear blade part 14 of the guide vane 11.

[0027] Similar to the first drive hub 18, the second drive hub 19 is directly coupled to one of the trailing blade parts 14 of one of the guide blades 11 of the guide blade ring 10, i.e. in such a way that the trailing blade part 14 of this guide blade 11 emanating from the second drive hub 23 can be twisted directly without the intervention of the second control ring 24. Thus, Figure 5 The second drive hub 23 is shown to act directly on Figure 5 . The second drive hub 23 is indirectly coupled to the rear blade parts 14 of the other guide blades 11 of the guide blade ring 10, i.e. in such a way that the rear blade parts 14 of the other guide blades 11 of the guide blade ring 10 emanating from the second drive hub 23 can be indirectly twisted with the intervention of the second control ring 24. For this purpose, the second drive hub 23 is coupled to the second control ring 24 via a second drive rod 25, so that the twisting of the second drive hub 23 causes the twisting of the second control ring 24. Then, the second control rings 24 are each coupled to the corresponding bearing pin 16 of the rear blade part 14 of the corresponding other guide blade 11 via a second blade rod 26.

[0028] The actuation or twisting of the second drive hub 23 accordingly leads to a direct twisting of the rear blade part 14 of a single guide blade 11 . The twisting of the other rear blade parts 14 of the other guide blades 11 takes place with the intervention of the second control ring 24 .

[0029] As from Figures 6 to 8 As can best be seen, each of the first blade bars 22 is comprised of two bar portions 22a, 22b, and each of the second blade bars 26 is comprised of two bar portions 26a, 26b.

[0030] The first of these lever parts, the first lever part 22a, 26a, of each blade lever 22, 26 acts on the respective control ring 19, 24. The second of these lever parts, the second lever part 22b, 26b, of each blade lever 22, 26 acts on the respective bearing pin 16, 15. The respective first lever part 22a, 26a acts on the respective second lever part 22b, 26b of the respective blade lever 22, 26 in an articulated manner. Figure 7 The fixed or non-articulated coupling of the second lever portion 26 b of the second blade lever 26 to the bearing pin 16 of the trailing blade member 14 is shown. Figure 8 The fixed or non-articulated connection of the second lever part 22b of the first blade lever 22 to the bearing pin 15 of the front blade part 13 of the guide blade 11 is shown. Figure 7 , Figure 8The connection 27, 28 between the first lever part 22a, 26a and the respective second lever part 22b, 26b of the respective blade lever 22 is shown. The first lever part 22a, 26a of the blade lever 22, 26 preferably acts on the respective control ring 19, 24 in an articulated manner.

[0031] The first drive hub 18 together with the first drive lever 21 is arranged in a first circumferential position of the guide vane ring 10 , and the guide vane adjustment device 17 and the second drive hub 23 with the second drive lever 25 are therefore arranged in a second, different circumferential position.

[0032] Viewed in the axial direction of the guide vane ring 10 , the first control ring 19 is arranged on a first axial side of the guide vane ring 10 facing the front blade part 13 , and the second control ring 24 is arranged on a second axial side of the guide vane ring 10 facing the rear blade part 14 of the guide vanes 11 .

[0033] The guide vane adjustment device 17 for adjusting the multi-component guide vanes 11 according to the invention accordingly utilizes two drive hubs 18, 23 and two control rings 19, 24, each guide vane 11 comprising a front blade component 13 and a rear blade component 14. The front blade component 13 can be twisted independently of the rear blade component 14. Therefore, there is no fixed adjustment law predetermined by the coupling mechanism between the adjustment of the front blade component 13 and the rear blade component 14. On the contrary, the adjustment between the blade components 13, 14 can be freely selected via a separate actuation of the adjustment issued from the separate drive hubs 18, 19, via the separate control rings 19, 24.

Claims

1. A guide blade adjusting device (17) for a turbine, namely for rotating a plurality of guide blades (11) of a guide blade ring (10) extending in the radial direction about the axis of rotation of the guide blades (11) of the guide blade ring (10), wherein: Each guide blade (11) comprises a front blade part (13) and a rear blade part (14) which are capable of twisting relative to each other. Features a first drive hub (18) which can be coupled to a first drive motor and can be driven via the first drive motor, and a first control ring (19) which transmits a twist of the first drive hub (18) for twisting the front blade part (18) of the guide blade (11) of the guide blade ring (10) to the front blade part (13), A second drive hub (23) and a second control ring (24), wherein the second drive hub (23) can be connected to a second drive motor and can be driven via the second drive motor, and the second control ring (24) transmits the torsion of the second drive hub (23) to the rear blade part (14) for twisting the front blade part (13) of the guide plate (11) independently of the torsion of the guide plate ring (10).

2. The guide vane adjustment device (17) according to claim 1, in, The first drive hub (18) is directly coupled to one of the front blade parts (13) of one of the guide blades (11) of the guide blade ring (10) in such a way that the front blade part (13) of the guide blade (11) of the guide blade ring (10) emanating from the first drive hub (18) can be twisted directly without the intervention of the first control ring (19), The first drive hub (18) is indirectly coupled to the front blade parts (13) of the other guide blades (11) of the guide blade ring (10) in such a way that the front blade parts (13) of the other guide blades (11) of the guide blade ring (10) emanating from the first drive hub can be indirectly twisted with the intervention of the first control ring (19).

3. The guide vane adjustment device (17) according to claim 1 or 2, in, The second drive hub (23) is directly coupled to one of the trailing blade parts (14) of one of the guide blades (11) of the guide blade ring (10) in such a way that the trailing blade part (14) of the guide blade (11) of the guide blade ring (10) emanating from the second drive hub (23) can be twisted directly without the intervention of the second control ring (24), The second drive hub (23) is indirectly connected to the rear blade parts (14) of the other guide blades (11) of the guide blade ring (10) in such a way that the rear blade parts (14) of the other guide blades (11) of the guide blade ring (10) emanating from the second drive hub can be indirectly twisted under the intervention of the second control ring (24).

4. The guide vane adjustment device (17) according to any one of claims 1 to 3, in, The first control ring (19) is each coupled to a bearing pin (15) of the front blade part (13) of the corresponding other guide blade via a first blade lever (22), The second control rings (24) are each coupled to a bearing pin (16) of the rear blade part (14) of the corresponding other guide blade via a second blade lever (26).

5. The guide vane adjustment device (17) according to claim 4, in, In the region of each guide blade (11), one of the bearing pins (16) of the front blade part (13) and the rear blade part (14) is formed as a solid pin and the other of the bearing pins (15) of the front blade part (13) and the rear blade part (14) is formed as a hollow pin, the rotation axis of the bearing pins extending coaxially in the radial direction.

6. The guide vane adjustment device (17) according to claim 4 or 5, in, The respective first blade lever (22) and the respective second blade lever (26) each comprise two lever portions (22a, 22b, 26a, 26b), namely a lever portion (22b, 26b) acting on the respective bearing pin (15, 16) of the respective blade member (13, 14) and a lever portion (22a, 26a) acting on the respective control ring (19, 24), Wherein, the two rod parts (22a, 22b, 26a, 26b) of the corresponding blade rod (22, 26) are interconnected in an articulated manner.

7. The guide vane adjustment device (17) according to any one of claims 1 to 6, in, The first drive hub (18) is coupled to the first control ring (19) via a first drive rod (21), The second drive hub (23) is coupled to the second control ring (24) via a second drive rod (25).

8. The guide vane adjustment device (17) according to claim 7, in, The first drive hub (18) is arranged together with the first drive rod (21) in a first circumferential position, and the second drive hub (23) is arranged together with the second drive rod (25) in a second further circumferential position of the guide blade ring (11).

9. The guide vane adjustment device (17) according to any one of claims 1 to 8, in, The first control ring (19) is arranged on a first axial side of the guide blade ring (11) facing the front blade part (13) of the guide blade, and the second control ring (24) is arranged on a second axial side of the guide blade ring (11) facing the rear blade part (14) of the guide blade.

10. A turbomachine having a rotor with moving blades and having a stator with guide blades, wherein: The guide vanes form at least one guide vane ring (10), and at least the guide vanes of at least one guide vane ring (10) are adjustable by a guide vane adjustment device (17), wherein the guide vane adjustment device (17) is formed according to any one of claims 1 to 9.

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