EP3333374A1 - Guiding vane adjustment with side-mounted actuation lever and corresponding assembly method - Google Patents

Abstract

Disclosed is a lever arrangement of a vane adjustment for connecting a guide vane of a turbomachine with an adjusting ring of an actuator, which is arranged such that an adjusting lever of the lever assembly moves from a first mounting direction transversely to a relative to a machine longitudinal axis of the turbomachine radial blade shank of the vane and so laterally this is applied and locked by means of a locking piece from a second mounting direction radially with the blade shank positively, a mounting method and a turbomachine.

Description

The invention relates to a lever arrangement of a vane adjustment of a turbomachine for establishing a connection between a vane and an actuator according to the preamble of patent claim 1, a method for establishing a connection between a vane and an actuator and a turbomachine.

Compressors in axial flow machines, for example aircraft engines, generally comprise a vane adjustment in the area of the front compressor stages or in the high-pressure compressor. Due to the vane adjustment, the guide vanes of the relevant guide vane row are adjusted speed-dependent about their vertical axis, so that an absolute Leitradabströmwinkel is changeable. As a result, a stall during startup of the turbomachine or at low speeds can be prevented. A step load is reduced. Alternatively, a stall could be realized by an adjustment of the blades of the compressor stages, but this is technically much more complicated, so that the adjustment of the vanes has prevailed.

The adjustment of the guide vanes of a row of vanes is conventionally carried out mechanically by actuation of an actuator. The actuator acts via an adjusting ring and one adjusting lever on the guide vanes. The adjusting ring is arranged outside the turbomachine and usually positioned in the flow direction behind and coaxial with the row of guide blades. It is displaceable in the circumferential direction and in the axial direction of the turbomachine. In the case of several compressor stages to be adjusted, the adjusting rings are actuated at the same time via a control lever of the actuator which is mounted rotatably on the compressor housing and which extends in the axial direction of the turbomachine and is in each case connected to the adjusting rings.

In known vane adjustments, the lever is inserted in the radial direction of the turbomachine onto a vane shaft extending in the vertical direction of the vane. Thereafter, the lever is fixed positively to a contact region of the blade shank and secured in position by a screw. The screwing can be done by an internal thread or by an external thread. This type of lever connection requires a sufficient thick blade shank for the design of the contact surfaces. However, the shaft diameter can hardly be greater than the smallest possible external thread due to the geometric boundary conditions such as small flow channel diameter and high number of blades. Now, if the shaft diameter must be significantly reduced due to the geometric boundary conditions, the above-described known lever connection is no longer representable with shank diameters that are barely larger than the allowable thread size. Furthermore, due to the small shaft diameter and the consequent small length of the contact surface to the lever, the tolerance of the contact surface has an increasingly unfavorable effect on an angular deviation of the lever from the blade profile.

The object of the invention is to provide a lever arrangement of a vane adjustment of a turbomachine for establishing a connection between a guide vane and an actuator, with which the mentioned disadvantages can be avoided. In addition, it is an object of the invention to provide a method for producing a connection between a guide vane and an actuator and to provide a turbomachine, which allows a small adjustable space a high adjustable vane number.

The object is achieved by a lever arrangement having the features of patent claim 1, by a method having the features of patent claim 10 and by a turbomachine having the features of patent claim 14.

An inventive lever arrangement of a vane adjustment of a turbomachine for establishing a connection between a vane and an actuator, wherein the vane has a vane shank which extends along its vertical axis and which can be brought by means of a lever with an adjusting ring of the actuator in connection, has a lever with a mouth-like connecting portion, by means of which it can be brought into contact with a contact region of the blade shank. Furthermore, the lever arrangement according to the invention has a U-shaped locking piece for locking the connecting portion with the blade shank, which has in a base body a passage for pushing onto the blade shank and two legs which extend on opposite sides of the main body. The one leg is for immersion in a mouth opening of the connecting portion and the other leg is designed to rest against a counter to the mouth opposite surface of the connecting portion. In the locked state, the connecting portion and the locking piece are positively connected to the contact area.

As a result of the lateral mounting of the lever on the blade shank according to the invention, the lever is no longer pushed onto the shovel shaft in the longitudinal direction of the shovel shaft, as described above, whereby the formation of the blade shank-side contact region on which the lever engages can take place almost independently of the remaining blade shank regions , Due to the lateral mounting of the lever on the blade shank, the diameter of the contact area need not be greater than the thread diameter, whereby the lever arrangement according to the invention is also suitable for very small shank diameters. The blade shank diameter is therefore no longer the decisive factor in the formation of the contact region. Thus, a reliable connection of the lever to the blade shank is possible even with a small shovel shaft diameter. As a result, the lever arrangement is particularly suitable for use in compressors of turbomachines, which require a high number of blades with a small available space, such as aircraft engines or compact industrial gas turbines. Due to the virtually non-existent geometric boundary conditions of the blade shank, the shank diameter can be significantly reduced.

A form fit between the connecting portion of the lever and the contact region of the blade shank is achieved in one embodiment in that the connecting portion has opposite mouth surfaces, which are formed corresponding to angularly mutually engaged contact surfaces of the contact area. For example, two flat contact surfaces can be provided, which are viewed in the longitudinal direction of the blade shank viewed roof-shaped to each other. Preferably, the contact surfaces are the same in size and shape, differ only in their orientation on the blade shank. The mouth surfaces are also the same in size and shape for manufacturing and assembly reasons. As an alternative to a roof-shaped angular position relative to one another, a trapezoidal orientation and the like are also conceivable. It is essential that the jaw surfaces and the contact surfaces are not rotationally symmetrical to the vertical axis, and that the form-fitting is free of play.

The contact surfaces can be easily produced by cross-sectional tapering of the blade shank. For example, they can be made by milling. By training as a cross-sectional tapers also arise in the transition region of Contact surfaces to a shaft region adjacent to the contact region shoulder surfaces, which act as a support for the connecting portion in the mounted state.

Preferably, the mating surface of the connecting portion is a wedge surface and the other leg has a wedge leg surface. The wedge surface and the wedge leg surface are arranged so that when mounting the locking piece, the connecting portion and the locking piece are moved against the contact surfaces of the contact area. As a result, the connecting portion is moved with its mouth surfaces against the contact surfaces when placing the locking piece. There is virtually a self-locking at the contact area.

The submersible in the mouth leg of the locking piece may have a contact surface for abutment against a contact surface of the contact area. By this measure it is achieved that not only the connecting portion, but also the locking piece abuts directly on the contact region of the blade shank, which favors the play-free positive locking.

For self-centering of the connecting portion at the contact area, the mouth surfaces of the connecting portion can be diverged in the direction of the mouth opening, viewed from the base of the mouth, and the leg, which can be dipped into the mouth opening, can have corresponding side faces. In order to prevent jamming of the leg in the mouth opening during locking, in the mounted state, at least one of the side surfaces is spaced from the mouth surface opposite it.

By means of a bracing device for bracing the connecting portion and the locking piece in the locked state, the backlash can be reliably guaranteed. In particular, in combination with the wedge surface and the wedge leg surface of the connecting portion and the locking piece are pressed against the contact surfaces of the contact area in the clamped state. The bracing device comprises, for example, a nut which is turned on an external thread of a free end region of the blade shank. Instead of an external thread and an internal thread may be formed with appropriate adjustment of the mother.

To secure the tension, it is advantageous if a securing element is provided for the arrangement between the locking piece and the bracing device, which has at least one bendable arm for lateral contact with the locking piece and / or the connecting portion. Alternatively or additionally, the bracing device can be self-locking, for example in the form of a self-locking nut. The arm can be put on the locking piece and / or the nut of the clamping device after tightening without the use of additional tools. In particular, several arms may be provided, so that when a poor arm still a reliable backup is guaranteed.

For connecting the lever to the adjusting ring, the lever can cooperate with an adjusting ring pin which is adapted to mount the lever by means of a radial movement on the adjusting ring. Preferably, the lever has a passage or through hole through which the respective adjusting ring pin is guided. This allows a fast and safe installation. To specify a desired position of the adjusting ring in the lever-side through hole, the adjusting ring pin, for example, have an annular shoulder, which acts as a Aufschiebe- or Eintauchbegrenzung. Preferably, the Verstellringstift is fixed after reaching its desired position on the lever. The bore for the adjusting ring pin is preferably based on the axis of rotation and the chord on the middle profile section of the respective airfoil. As a result, an influence of manufacturing tolerances on the contact surfaces on the angular position of the blade profile is eliminated, but at least substantially reduced. Of course, the contact surface geometry can also be produced without reference to the bore for the adjusting ring pin to the vertical axis and chord. The positioning and production of the bore is basically independent of the design of the contact surfaces.

In a method according to the invention for establishing a connection between a vane and an actuator, wherein the vane has a vane shank which extends along its vertical axis and which is connected by means of a lever with an adjusting ring of the actuator, the lever from a first mounting direction applied laterally on the blade shank and locked by means of a locking piece from a second mounting direction with the blade shank positively, which is different to the first mounting direction. The assembly of the lever is no longer based on the machine longitudinal axis radially from the outside, but from the side. Due to the different second mounting direction of the locking piece, in particular a radial mounting direction relative to the machine longitudinal axis, a lock already takes place without any tensioning.

A preferred method comprises the steps of radially and pivotally mounting the lever on the adjusting ring, laterally applying a jaw-like connecting portion of the lever to a contact region of the blade shank by laterally pivoting the lever, radially pushing a locking piece onto the blade shank until locked in engagement therewith is the connecting portion and clamping the connecting portion and the locking piece in the locked state, wherein the connecting portion and the locking piece are pressed against the contact area.

To compensate for manufacturing tolerances at the contact points between the lever and the blade shank, a through hole for receiving the Verstellringstiftes can be positioned in the lever before mounting the respective lever on the adjusting ring such that the lever for forming the through hole is pre-assembled on the blade shank and is dismantled from the blade shank after formation of the through hole. As a result, the angular position of the respective vane, which is defined by its axis of rotation and chord on the middle profile section, optimally transferred to the position of the axis of the Verstellringstiftes.

In order to achieve a reliable locking, it is advantageous if, during clamping, the connecting portion and the locking piece are secured against loosening.

A turbomachine according to the invention has a plurality of the lever arrangements according to the invention for establishing a connection between guide vanes of an adjusting blade row and an actuator. Due to the lever arrangements according to the invention, vane adjustments are possible with guide vanes having a very small shaft diameter and / or at a very close distance from one another. For example, the vane adjustments of the front compressor stages or the high-pressure compressor such lever arrangements, so that the turbomachine can be equipped with a very powerful or performance-optimized compressor.

Other advantageous embodiments of the invention are the subject of further subclaims.

In the following preferred embodiments of the invention will be explained in more detail with reference to drawings. It is understood that individual elements and components can be combined differently than shown. Reference numerals for corresponding elements are used across figures and may not be rewritten for each figure.

Figur 1:

eine Seitenansicht einer Leitschaufel in Einbaulage mit einem erfindungsgemäßen Ausführungsbeispiel einer Hebelanordnung und eines Verstellrings einer Leitschaufelverstellung,

Figur 2:

eine Draufsicht auf die Anordnung nach Figur 1,

Figur 3:

einen Kontaktbereich eines Schaufelschaftes der Leitschaufel zur formschlüssigen Aufnahme des Hebels,

Figur 4:

einen ersten Schnitt durch den Kontaktbereichs des Schaufelschaftes mit verriegelten Hebel und Verriegelungsstück,

Figur 5:

die Darstellung nach Figur 3 ergänzt um einen Verbindungsabschnitt des Hebels,

Figur 6:

das Verriegelungsstück der Hebelanordnung in Einzeldarstellung,

Figur 7 bis 10:

Montageschritte zur Montage der Hebelanordnung, und

Figur 11:

einen zweiten Schnitt durch den Kontaktbereichs des Schaufelschaftes mit verriegelten Hebel und Verriegelungsstück.

They show schematically:

FIG. 1:

a side view of a guide vane in the installed position with an embodiment according to the invention of a lever arrangement and an adjusting ring of a vane adjustment,

FIG. 2:

a plan view of the arrangement according to FIG. 1 .

FIG. 3:

a contact region of a blade shank of the guide blade for the positive reception of the lever,

FIG. 4:

a first section through the contact area of the blade shank with locked lever and locking piece,

FIG. 5:

the representation after FIG. 3 supplemented by a connecting portion of the lever,

FIG. 6:

the locking piece of the lever arrangement in individual representation,

FIGS. 7 to 10:

Assembly steps for mounting the lever assembly, and

FIG. 11:

a second section through the contact region of the blade shank with locked lever and locking piece.

In general, information such as "radial", "radially outside", "radially inward", "coaxial" and "circumferential direction" refers to a machine longitudinal axis X of the turbomachine according to the invention, which represents the axis of rotation of a rotor of the turbomachine. Information such as "lateral" and "transverse" refer to a vertical axis H of a guide vane of the turbomachine which extends in or substantially radially to the machine longitudinal axis X.

FIG. 1 shows a guide vane 1 of an adjustable row of blades of a turbomachine. The turbomachine is, for example, an aircraft engine and the vane row is arranged in the compressor of the aircraft engine.

The vane 1 is connected via a lever arrangement 2 according to the invention with a vane adjustment. The guide vane 1 has an airfoil 4 which is located in a flow channel of the turbomachine through which the main flow passes. About a radial to the blade 4 inner bearing pin 6, the guide vane 1 is mounted in an inner ring, not shown. To attack the lever assembly 2, the vane has a blade shank 8 which extends radially outward from the blade leaf 4 and is led out of a main flow path of the turbomachine and runs along the vertical axis H. By means of the located outside of the main flow path of the turbomachine lever assembly 2 of the blade shank 8 and thus the guide vane 1 is operatively connected to a Leitschaufelreihe coaxial and outside of the main flow path of the turbomachine adjusting ring 10. To adjust the vanes 1 about their vertical axes H of the adjusting ring 10th shifted by an actuator, not shown, and the displacement is transferred to the rotational position of the vanes 1. Each vane 1 of the adjustable vane row is provided with such a lever assembly 2, which are each connected to the adjusting ring 10.

The lever arrangement 2 has an adjusting lever or lever 12, which has a connecting portion 14 for connection to a contact region 16 of the blade shank 8 and a connecting portion 18 for connection to an adjusting ring pin 20 of the adjusting ring 10. In addition, the lever assembly 2 has a locking piece 22 for locking the connecting portion 14 at the contact portion 16, a clamping device 24 for clamping the locking piece 22 and the connecting portion 14 with the contact portion 16, and a securing element 28 for securing the tension. The bracing device 24 is here for example a cooperating with an external thread nut. The securing element 28 here is for example a washer.

As FIG. 2 can be seen, the fuse element 28 here has three plastically deformable and thus bendable arms 30a, 30b, 30c, of which an arm 30a opposite to the other two arms 30b, 30c extends. In the secured state, at least one of the arms 30a bears laterally against the locking piece 22, so that rotation of the securing element 28 about the vertical axis H is prevented.
It has a through hole 32 for passing the Verstellringstiftes 20 and for radially pushing the lever 12 on the Verstellringstift 20. The positioning of the For setting a target position on the lever 12, the adjusting ring pin 20 has an annular shoulder 33, which in the mounted state on the connecting portion 18 of the lever 12th is applied. The formation of the through-bore 32 can be effected by preassembling the lever 12 on the blade shank 8 and dismantling it after the formation of the through-bore 32. As a result, the blade shank 8 and the lever 12 are produced as so-called paired parts, whereby the angular position of the respective guide blade 1 is transmitted to the Verstellringstift 20 by this measure and so manufacturing tolerances are compensated.

According to the FIGS. 3 and 4 the contact region 16 for engagement of the lever-side connecting portion 14 has two contact surfaces 34a, 34b facing away from each other. The contact surfaces 34a, 34b are planar surfaces and flattened peripheral portions of the blade shank 8. They are in particular local cross-sectional tapers of the blade shank 8. As in a radial plan view of the contact region 16 in FIG FIG. 4 can be seen, the contact surfaces 34a, 34b roof-like employed to each other and form with a peripheral surface arranged between them 36 a kind of triangle. The peripheral surface 36 arranged between them has a concave arc surface due to its original contour. Thus, the contact region 16 in this exemplary embodiment has three contact surfaces 34a, 34b, 36, two of which are or are designed as planar surfaces 34a, 34b and one as an arc surface 36. As a result, the contact region 16, in contrast to adjacent shaft regions 26, 40, is not rotationally symmetrical with respect to the vertical axis H, which fundamentally permits a rotationally secured fastening of the lever 12 by positive engagement.

In the transition region of the contact surfaces 34a, 34b to the radially inner adjacent original shaft portion 40 shoulder surfaces 38 are formed, of which due to the perspective in FIG. 3 only one can be seen. The shoulder surfaces 38 form supports for the connecting portion 14 in the clamped state and limit a radial position of the lever 12 on the blade shank 8. They allow in the first place the tension.

For receiving the nut 24 of the bracing device, the external thread is applied to the free end region 26 of the blade shank 8, which is spaced from the contact region 16 via an annular groove 42.

The connecting portion 14 is, as in the FIGS. 4 and 5 shown, mouth-like. The connecting portion 14 is virtually opened laterally, whereby the lever 12 can be attached laterally to the blade shank 8. He has two mouth jaws 44a, 44b, between which an unnumbered mouth is formed. The mouth is bounded by two opposing mouth surfaces 46a, 46b, which diverge from a mouth base 48 in the direction of a mouth opening 50. As a result, the mouth is wedge-shaped, wherein the mouth base 48 is substantially narrower than the mouth opening 50, which allows self-centering of the connecting portion 14 at the contact area 16 when laterally applied. In the assembled state, the connecting portion 14 abuts with its mouth surfaces 46a, 46b on in each case one of the contact surfaces 34a, 34b.

Opposite to the mouth opening 50 of the connecting portion has a counter surface or wedge surface 52, which, relative to the machine longitudinal axis X viewed radially from outside to inside of the vertical axis H away.

The locking piece 22 is according to the FIGS. 5 and 6 U-shaped. It has a main body 54 and two legs 56, 58 which extend from opposite narrow sides of the main body 54 in the same direction. The main body 54 is plate-like and has a passage 60 for passing through the free end portion 26 of the blade shank 8 or for radially pushing the locking piece 22 on the blade shank 8. The passage 60 is such that lateral relative displacements of the locking piece 22 to the blade shank 8 during locking and Bracing is possible.

The one leg 56 is a guide leg for immersion in the mouth opening 50 in the locked state. For this purpose, the guide leg 56 essentially has a shape corresponding to the mouth with two side faces 62a, 62b facing away from one another, which are arranged opposite the mouth faces 46a, 46b in the mounted state. In addition, the guide leg 56 has a corresponding to the peripheral surface 36 of the blade shank 8 convex bearing surface 64. It is essential that the guide leg 56 does not come with its two side surfaces 62a, 62b on the mouth surfaces 46a, 46 into abutment, but that always a gap between at least one the side surfaces 62a, 62b and one of the mouth surfaces 46a, 46b remains, otherwise its contact surface 64 is not brought into contact with the shaft-side peripheral surface 36 and thus no distortion would be possible, since then the guide leg 56 is jammed in the mouth opening 50. As in FIG. 4 to recognize in the locked and tensioned state preferably none of the side surfaces 62a, 62b into contact with the mouth surfaces 46a, 46b, but they are each spaced therefrom. However, the abutment surface 64 is in abutment with the shank-side circumferential surface 36.

The wedge leg 58 has a wedge leg surface 66 which points in the direction of the guide leg 56. It has an oblique position corresponding to the wedge surface 52 of the connecting portion 14 such that it is located near the main body 54 closer to the guide leg 56 than far away from the main body 54. This orientation of the wedge surface 52 and the wedge leg surface 66 causes locking and clamping the connecting portion 14 and the locking piece 22 are pressed against the contact surfaces 34a, 34b and against the peripheral surface 36 of the contact region 16, respectively.

To prevent emergence of the locking piece 22 with its base body 54 on a base body 54 facing top 68 of the connecting portion 14 during locking and bracing, the guide leg 56 and the wedge leg 58 are spaced apart such that in the mounted state is always a radial gap 69 between a Bottom 70 of the body 54 and the top 68 of the connecting portion is created ( FIG. 11 ).

In a method according to the invention for mounting the lever arrangement 2 according to the invention on a blade shank 8 of a guide blade 1 of a guide blade row, it is essential that the lever 12 of the lever arrangement 2 be laid laterally on the contact region 16 of the blade shank 8 of the guide blade 1 in a first mounting direction and off by means of the locking piece 22 a second mounting direction with the blade shank 8 is positively locked. Before the lateral application of the lever 12 on the shaft-side contact region 16, the lever 12 is mounted on the adjusting ring 10 from a mounting direction, which is equal to the second mounting direction. The lever 12 is thus pivoted laterally after the connection to the adjusting ring pin 20 until it is in contact with the contact region 16 of the blade shank 8 with its connecting section 14. This assembly is repeated until each vane 1 of the vane row is provided with the lever arrangement 2 according to the invention.

The following is a detailed explanation of the method according to the invention. As mentioned above, information such as "radial" refer to the machine longitudinal axis X of the turbomachine according to the invention, the axis of rotation of a rotor of the Turbomachine represents. Information such as "lateral" refer to the vertical axis H of the guide vane 1 of the turbomachine, which extends in or substantially radially to the machine longitudinal axis X.

At the beginning of the assembly, the respective adjusting ring pin 20 is fastened to the lever 12 (cf. FIGS. 1 and 7 ). For this purpose, the adjusting ring pin 20 is guided to the annular shoulder 33 through the through hole 32 of the connection portion 18 and then connected thereto. Subsequently, the lever 12 is mounted with the preassembled Verstellringstift 20 with the adjusting ring 10. For this purpose, the respective adjusting ring pin 20 is inserted radially on the lever 12 in a receptacle of the adjusting ring 10. Subsequently, the lever 12 is pivoted about the adjusting ring pin 20 until its connecting portion 14 runs onto the contact region 16, so that the mouth surfaces 46a, 46b are in contact with the contact surfaces 44a, 44b (see FIG FIG. 4 ). Radially, the connecting portion 14 rests on the shoulder surfaces 38 of the blade shank 8 (see FIG. 3 ). Thereafter, the locking piece 22 is pushed radially by means of its passage 60 via the free end portion 26 on the blade shank 8 such that it dives with its guide limb 56 into the mouth opening 50 and this virtually closes ( FIG. 7 ). At the same time, the locking piece 22 applies with its wedge leg 58 to the wedge surface 52. Because of the wedge surface 52 and the wedge leg surface 66 of the wedge leg 66, a self-locking of the lever 12 takes place on the blade shank 8. Because by the wedge surface 52 and the wedge leg surface 66 is, as shown in FIG FIG. 8 , the connecting portion 14 to the left and the locking piece 22 along the wedge surface 52 slidably moved to the right. The connecting portion 14 and the locking piece 22 are moved toward each other, whereby the contact area 16 of the blade shaft 8 located between them is clamped.

As in FIG. 9 shown, the locking element 28 is pushed radially over the free end portion 26 on the blade shank 8 after locking until it rests on the locking piece 22. Then at least one arm 30a of the securing element 28 is bent in such a way that it rests laterally against the locking piece 22 and is thus secured against rotation.

Subsequently, as in FIG. 10 shown, the nut 24 of the bracing device screwed onto the external thread of the free end portion 26. Due to the radial support on the shoulder surfaces 38 of the blade shank 8, the connecting portion 14 can not escape radially inward. As a result, the connecting portion 14 and the locking piece 22 pressed against the contact region 16 with a defined bracing force, so that the connecting portion 14 and the locking piece 22 are positively connected to the contact region 16 in the locked state. The tension is chosen so that a play-free locking takes place. The securing of the nut 24 against loosening rotational movements takes place by self-assurance and here by way of example additionally by bending at least one of the arms 30b, 30c on the tightened nut (not shown).

In FIG. 11 the locking of the lever 12 on the blade shank 8 in the contact region 16 is shown in section. In particular, it is the interaction of the wedge leg surface 66 with the wedge surface 52, the abutment of the contact surface 64 on the peripheral surface 36 of the blade shank 8 and the radial spacing of the underside 70 of the body 54 of the locking piece 22 from the top 68 of the connecting portion 14 in the locked and clamped state shown. In addition, it can be clearly seen that the lead-through 60 in the main body 54 of the locking piece 22 has such an inner diameter that the free end portion 26 is accommodated with play in the lead-through 60, so that lateral relative displacements of the locking piece 22 to the blade shank 8 during locking and bracing are made possible ,

It is mentioned that embodiments of the invention are also included in which the adjusting ring pins 20 are not preassembled with the levers 12. For example, the Verstellringstifte 20 can be previously mounted on the adjusting ring 10 and then the lever 20 are pushed onto the respective adjusting ring 20 mounted on the adjusting ring 20.

Disclosed is a lever arrangement of a vane adjustment for connecting a guide vane of a turbomachine with an adjusting ring of an actuator, which is arranged such that an adjusting lever of the lever assembly moves from a first mounting direction transversely to a relative to a machine longitudinal axis of the turbomachine radial blade shank of the vane and so laterally this is applied and locked by means of a locking piece from a second mounting direction radially with the blade shank positively, a mounting method and a turbomachine.

reference numeral

1

vane

2

lever assembly

4

airfoil

6

pivot

8th

blade shank

10

adjusting

12

Adjustment lever / lever

14

connecting portion

16

contact area

18

connecting section

20

Verstellringstift

22

locking piece

24

Clamping device / nut

26

free end area

28

fuse element

30a, b, c

poor

32

Through Hole

33

Ring shoulder

34a, b

contact surfaces

36

Peripheral surface / contact surface

38

shoulder surface

40

adjacent shaft area

42

ring groove

44a, b

jaw jaw

46a, b

jaw surfaces

48

Maul reason

50

opening

52

Wedge surface / mating surface

54

body

56

Legs / guide legs

58

Thighs / wedge legs

60

execution

62a, b

side surface

64

contact surface

66

Wedge leg surface

68

Top of the connecting section

69

radial gap

70

Bottom of the body

H

vertical axis

X

machine longitudinal axis

Claims (14)

Lever arrangement (2) of a vane adjustment of a turbomachine for establishing a connection between a vane (1) and an actuator, wherein the vane (1) has a vane shaft (8) extending along its vertical axis (H) and by means of a lever ( 12) can be brought into connection with an adjusting ring (10) of the actuator, characterized in that the lever (12) has a mouth-like connecting portion (14), by means of which it can be brought into contact with a contact region (16) of the blade shank (8) , and a U-shaped locking piece (22) is provided for locking the connecting portion (14) with the blade shank (8) having in a base body (54) a passage (60) for sliding onto the blade shank (8) and two legs (56) extending on opposite sides of the main body (54), wherein the one leg (56) for immersion in a mouth opening (50) of the Verbindungsabschni tts (14), and the other leg (58) for engagement with a mouth opening (50) opposite counter surface (52) of the connecting portion (14) is formed, wherein the connecting portion (14) and the locking piece (22) in the locked state positively are connected to the contact area (16). A lever assembly according to claim 1, wherein the connecting portion (14) has opposite jaw surfaces (46a, 46b) and the contact portion has contact surfaces (34a, 34b) respectively corresponding to each other, the jaw surfaces (46a, 46b) and the contact surfaces (34a , 34b) are each arranged at an angle to each other. Lever arrangement according to claim 2, wherein the contact surfaces (34a, 34b) by cross-sectional tapering of the blade shank (8) are provided and the contact surfaces (34a, 34b) via a respective shoulder surface (38) on a contact region (16) adjacent shank region (40). go over, make the pads for the connecting portion (14). Lever assembly according to claim 2 or 3, wherein the mating surface (52) of the connecting portion is a wedge surface and the other leg (58) has a wedge-shank surface (66), which are arranged so that when mounting the locking piece (22) of the connecting portion (14). and the locking piece (22) is moved against the contact surfaces (34a, 34b) of the contact area (14). Lever arrangement according to one of the preceding claims, wherein in the mouth opening (50) submersible leg (56) has a contact surface (64) for abutment against a contact surface (36) of the contact region (16). Lever arrangement according to one of the claims 2 to 5, wherein the jaw surfaces (46a, 46b) of the connecting portion (14) diverge from the mouth base (48) in the direction of the mouth opening (50) and the leg (56) which can be submerged in the mouth opening (50). to these corresponding side surfaces (62a, 62b), wherein in the assembled state, at least one of the side surfaces (62a, 62b) is spaced from its opposite mouth surface (46a, 46b). Lever assembly according to one of the preceding claims, wherein a clamping device (24) for clamping the connecting portion (14) and the locking piece (22) is provided in the locked state. Lever arrangement according to the preceding claim, wherein a securing element (28) is provided for the arrangement between the locking piece (22) and the bracing device (24), which has at least one bendable arm (30a, 30b, 30c) for the lateral engagement with the locking piece (22). and / or at the connecting portion (14). Lever arrangement according to one of the preceding claims, wherein the lever (12) cooperates with an adjusting ring pin (20) for connection to the adjusting ring (10), which is adapted to the connection to the adjusting ring (10) by means of a radial movement of the lever (10). 12). Method for establishing a connection between a guide vane (1) and an actuator, wherein the vane has a vane shaft (8) extending along its vertical axis (H) and by means of a lever (12) with an adjusting ring (10) of the actuator wherein the lever (12) from a first mounting direction laterally applied to the blade shank (8) and by means of a locking piece (22) from a second mounting direction with the blade shank (8) is positively locked, which is different from the first mounting direction. Method according to claim 10, comprising the steps: Radially and pivotably mounting the lever (12) on the adjusting ring (10), Lateral application of a mouth-like connecting portion (14) of the lever (12) to a contact region (16) of the blade shaft (8) by lateral pivoting of the lever (12), Radially pushing a locking piece (22) onto the blade shank (8) until it is in locked engagement with the connecting portion (14), • Locking the connecting portion (14) and the locking piece (22) in the locked state, wherein the connecting portion (14) and the locking piece (22) against the contact area (16) are pressed. A method according to claim 10 or 11, wherein prior to mounting the lever (12) on the adjusting ring (10) has a through hole (32) for receiving the Verstellringstiftes (20) in the lever (12) is introduced, wherein the lever (12) for Forming the through hole (32) on the blade shank (8) is pre-assembled and after formation of the through hole (32) of the blade shank (8) is dismantled. A method according to claim 10, 11 or 12, wherein when tightening the connecting portion (14) and the locking piece (22) are secured against loosening. Turbomachine with a plurality of lever arrangements (14) according to one of the claims 1 to 9 for establishing a connection between guide vanes (1) of an adjusting blade row and an actuator.

Images