EP3412874A1 - Axially divided turboengine inner race - Google Patents

Abstract

The present invention relates to an axially divided inner ring for attachment to, in particular adjustable, guide vanes (50) of a turbomachine, in particular a compressor or turbine stage of a gas turbine, which has a first part ring (10) and a second part ring (20), which in axial direction directly or indirectly on two axially facing support surfaces (11, 12) of the first partial ring (10) is supported and fixed in the radial direction by a plurality of circumferentially distributed dowel pins (40) on the first part ring (10).

Description

The present invention relates to an axially divided inner ring for attachment to, in particular adjustable, vanes of a turbomachine, in particular a compressor or turbine stage of a gas turbine, a guide grid and a turbomachine, in particular gas turbine, with the inner ring and method for its production and assembly.

From the DE 103 51 202 A1 is a gas turbine with an axially split into two partial rings inner ring known, which is attached to adjustable vanes, wherein the partial rings are screwed together.

An object of an embodiment of the present invention is to improve an axially split inner ring.

This object is achieved by an inner ring having the features of claim 1. Claims 12-15 provide protection for a guide grid and a turbomachine with (at least) an inner ring described here, or a method for producing or mounting an inner ring described here. Advantageous embodiments of the invention are the subject of the dependent claims.

According to one embodiment of the present invention, (at least) an axially divided inner ring on which, in particular adjustable (e), guide vanes of a guide grille for or a turbomachine, in particular a compressor or turbine stage of a gas turbine, in particular an aircraft engine, attached, in particular rotatably mounted, are or will or is designed for this purpose, a first and a second sub-ring, wherein the second sub-ring in the axial direction of two axially facing support surfaces of the first sub-ring, in particular directly or directly ( on the support surfaces) or indirectly, in particular via at least one spring means, supported and is fixed in the radial direction by a plurality of circumferentially distributed dowel pins on the first part ring or is.

In one embodiment, thus, the functionality of a screw, the two sub-rings set both in the radial direction and in the axial direction to each other, distributed to the dowel pins and the support. In particular, in this way, in one embodiment, in particular compared to a screw, the assembly improves, reduces the installation space and / or the reliability, in particular strength, of the connection can be improved.

In the present case, the directional indication "axial" refers in a usual way to a direction parallel to a rotational or (main) machine axis of the turbomachine, the direction indication "circumferential direction" corresponds to a direction of rotation about this rotation or (main) machine axis, the direction indication "radially" in a direction perpendicular to the axial and circumferential directions.

In one embodiment, the second partial ring is or is clamped in the axial direction between the two mutually facing support surfaces of the first partial ring, in particular elastically.

As a result, in one embodiment, the determination by the dowel pins in the radial direction frictionally supported or (this) relieved and / or reduced or avoided game in the axial direction.

In one embodiment, the second part-ring has at least one, in particular radially inner or inner, annular or circumferential groove for reducing its rigidity in the axial direction, which is communicated or connected in a further development with at least one recess into which one of the dowel pins is plugged in.

In this way, in one embodiment, an assembly and / or clamping of the second partial ring and / or a production of the recess (s) can be improved.

In one embodiment, the second part-ring, in particular with support surfaces, contacts the two mutually facing support surfaces of the first part-ring or lies directly or directly against it, in an embodiment with an interference fit or under prestress. In a further development, the second sub-ring by the or between the two support surfaces contacting it, in particular elastic, compressed and thereby clamped, in particular by an axial distance or an axial clearance between the support surfaces is shorter than an axial distance of these contacting support surfaces of the second sub-ring or a wall thickness of the second sub-ring between the two support surfaces with undeformed second part ring. In a further development, the second partial ring is shrunk or clamped with a shrink fit between the two mutually facing support surfaces of the first partial ring, in particular by the first and / or second partial ring for assembly corresponding, in particular different, tempered, in particular cooled or warmed up, becoming or becoming.

As a result, in one embodiment, play in the axial direction can be reduced or avoided and / or the fixation by the dowel pins in the radial direction can be assisted or relieved of frictional engagement.

In another embodiment is or is between the second part ring and at least, in particular only one of the two mutually facing support surfaces a, in particular one or more parts spring means, in particular a one or more parts, in particular beveled and / or curved, spring plate arranged In particular, at least partially (engaging) in a groove (s) in the first part ring and / or a groove in the second part ring, by which the second part ring between the mutually facing support surfaces of the first part ring, in particular elastically, is braced or is and over which the second sub-ring indirectly supported on the corresponding one of the two mutually facing support surfaces of the first sub-ring in the axial direction.

In this way, in one embodiment, an assembly and / or disassembly can be improved, in particular in comparison to a contact of the partial ring with two mutually facing support surfaces.

Thus, in one embodiment, the second sub-ring is supported in the axial direction directly with its supporting surfaces contacting the two axially facing support surfaces. In another embodiment, the second partial ring is supported in the axial direction on one or both support surfaces indirectly via (in each case) a one- or multi-part spring means. Additionally or alternatively, in one embodiment in the axial direction between the second sub-ring and one or both support surfaces, a single- or multi-layer intermediate layer may be arranged or, in particular these embodiments or power flows as a support in the axial direction of the or the ( respective) support surface (s) of the first partial ring in the context of the present invention.

In one embodiment, one or more, in particular all, dowel pins frictionally in a blind hole or a (forehead) closed or passage or two (frontally) open recess, in particular hole, in the first part ring and / or a blind hole-like or a (frontally) closed or passage or two (frontally) side open recess, in particular hole, inserted in the second sub-ring.

Through a blind hole-like recess, a dowel pin in one embodiment can be unilaterally secured in the axial direction or be. Through a passage recess assembly can be improved in one embodiment.

One or more, in particular all, dowel pins are smooth or threadless in one embodiment or are or are not bolted to the first and / or second part ring.

As a result, in one embodiment, compared to a screw assembly improves the installation, reduces the space and / or reliability, in particular strength, the connection can be improved.

In one embodiment, one or more, in particular all, dowel pins are secured in the axial direction by a, in particular mono- or multi-part, securing means, in particular one-way, which is attached to one or both partial rings, in particular by frictional engagement, in particular by a single or multi-part, in particular bevelled and / or curved, locking plate or a one-part or multi-part wedge-like securing element or a one or more parts Securing wedge, which in one embodiment at least partially (engaging) in at least one (r) groove in the first part ring and / or at least one (r) groove in the second part ring, arranged, in particular frictionally engaged therein is or is.

As a result, in one embodiment, in the event of failure of the dowel pin and / or frictional engagement, the likelihood of damage to the turbomachine can be reduced.

In one embodiment, the securing means may comprise the spring means, in particular at the same time be the spring means.

In this way, the same means, in particular one or more parts and / or bevelled and / or curved, sheet metal realize a double function in one embodiment.

In one embodiment, the wedge-like securing means or the securing wedge, in particular one or more parts of the securing wedge respectively, has a wall thickness increasing or decreasing in the circumferential direction. As a result, in one embodiment, the wedge-like securing means or the securing wedge can advantageously be fixed by friction in the groove (s).

In one embodiment, the locking plate or the securing wedge is inserted in the circumferential direction in the groove (s). As a result, in one embodiment, the assembly can be facilitated.

In one embodiment, a, in particular (radially) inner, support (shell or peripheral) surface of the second sub-ring in the radial direction, in particular from radially outside or to a rotation or (main) machine axis of the turbomachine out on a , in particular (radially) outer, counter (circumferential) surface of the first part ring, in an embodiment in the axial direction at least on a part of an axial engagement of at least one of the dowel pins in the second part ring, in particular at least on the axial length of the axially engaging at least one of the dowel pins in the second part ring.

As a result, in one embodiment, the determination supported by the dowel pins in the radial direction and / or assembly can be improved.

In one embodiment, at least one of the support surfaces on a radially projecting or radial flange, in particular annular flange or (ring) collar, the first partial ring arranged, in particular formed. The (end) flange is arranged in an embodiment frontally on the first part of the ring, he can in particular limit or complete the opposite surface of the first part of the ring. In another embodiment, the flange or collar between one end face and the other of the two support surfaces is arranged, in particular on the mating surface of the first part ring.

Additionally or alternatively, at least one of the support surfaces in a radially extending or radial groove, in particular annular or circumferential groove of the first partial ring is arranged, in particular formed, in particular in the groove in which the spring means is at least partially disposed or in which it intervenes.

Additionally or alternatively, in one embodiment at least one of the support surfaces is flat and / or at least one of the support surfaces is curved.

As a result, in one embodiment in each case, in particular in combination, a production, assembly and / or support can be improved.

In one embodiment, the first and / or second partial ring is / are or are segmented in the circumferential direction, in particular in two halves.

As a result, in one embodiment, a production and / or assembly can be improved.

In one embodiment, the inner ring has a, in particular integrally formed with the first and / or second part ring or on the first and / or second part ring, in particular non-destructive releasably, in particular materially, or non-destructively detachable, in particular friction and / or form-fitting, fixed , one or multi-part radial seal, which is arranged in a version radially inward on the inner or partial ring. The inner ring can thus be in one embodiment in particular a sealing ring or seal carrier.

In one embodiment, the first and second sub-rings form or limit blind-hole-like or through-recesses, in particular, bores in which the guide vanes are fastened, in particular cones of the guide vanes mounted directly or via bushings. In one embodiment, there is a parting plane of the first and second part ring, in one embodiment at least substantially symmetrical, in or through these recesses, in particular a contact plane between one of the support surfaces of the first part ring and a support surface of the second part ring resting thereon.

As a result, in one embodiment, a production and / or assembly can be improved.

In one embodiment, the cones of the guide vanes, the bushings and / or the first and / or second sub-ring, in particular the blind-hole-like or passage recesses, are at least partially coated. In this way, in one embodiment, a bearing, in particular adjustment, of the guide vanes can be improved.

To produce an axially divided inner ring described here, in one embodiment, the first and / or second part ring, in particular material removal, in particular-removing, in particular machined, machined, in particular (the) recesses for the dowel pins and / or vanes manufactured, in particular finished, and / or the first and / or second sub-segment segmented, while at least one, in particular finished, the support surfaces of the first sub-ring and one, in particular finished, supporting surface of the second sub-ring are arranged and pressed against each other in the axial direction against each other or are. After this processing, the two partial rings can be released from each other again, attached to the guide vanes and thereby connected by the dowel pins.

For mounting an axially divided inner ring described here, in one embodiment, the second part ring in the axial direction between the two mutually facing support surfaces of the first part ring elastically clamped, in particular by shrinking or the or arranging the spring means (s), and, in particular before, simultaneously or subsequently, fixed in the radial direction by the dowel pins on the first part ring. In this case, in one embodiment, the two partial rings are displaced in the opposite direction to each other in the axial direction and at least partially surround the guide vanes, in particular their bearing journal.

As a result, in one embodiment, a production, assembly and / or dimensional stability can be improved.

Fig. 1

einen Teil eines Leitgitters einer Turbomaschine mit einem Innenring nach einer Ausführung der vorliegenden Erfindung in einem Meridianschnitt;

Fig. 2

einen Teil eines Leitgitters einer Turbomaschine mit einem Innenring nach einer weiteren Ausführung der vorliegenden Erfindung in Fig. 1 entsprechender Darstellung; und

Fig. 3

einen Teil eines Leitgitters einer Turbomaschine mit einem Innenring nach einer weiteren Ausführung der vorliegenden Erfindung in Fig. 1, 2 entsprechender Darstellung.

Further advantageous developments of the present invention will become apparent from the dependent claims and the following description of preferred embodiments. This shows, partially schematized:

Fig. 1

a portion of a guide grid of a turbomachine with an inner ring according to an embodiment of the present invention in a meridian section;

Fig. 2

a part of a guide grid of a turbomachine with an inner ring according to a further embodiment of the present invention in Fig. 1 corresponding representation; and

Fig. 3

a part of a guide grid of a turbomachine with an inner ring according to a further embodiment of the present invention in Fig. 1, 2 corresponding representation.

Fig. 1 shows a part of a guide grid of a turbomachine with an inner ring according to an embodiment of the present invention in a meridian section in which a (main) machine axis (horizontally in Fig. 1 ) lies.

The inner ring has a first partial ring 10 and a second partial ring 20 and is thus axially or in the axial direction (horizontally in FIG Fig. 1 ) (two) shared. In the circumferential direction is or are the inner ring or the partial rings 10, 20 (each) segmented in two halves.

At the first part ring 10 is radially inward (bottom in Fig. 1 ) A radial seal 19 is arranged.

The first and second part ring 10, 20 together form blind hole-like holes 52, in which pins 51 are rotatably supported by adjustable vanes 50, in one embodiment directly, in another embodiment via sockets (not shown).

The second partial ring 20 is in the radial direction (vertically in Fig. 1 ) fixed by a plurality of circumferentially distributed dowel pins 40 on the first part of the ring 10, the frictionally engaged in through holes 24 in the second part of ring 20 and partially inserted through this in blind hole-like holes 14 in the first part ring 10.

The second partial ring 20 is supported in the axial direction on two axially facing support surfaces 11, 12 of the first partial ring 10, wherein the support surface 12 is arranged in a radial groove 13 of the first partial ring 10.

Here, a support surface 21 of the second sub-ring 20 contacts the support surface 11 of the first sub-ring 10, while between the second sub-ring 20 and the other support surfaces 12, a spring means 30 is arranged, through or over which the second sub-ring 20 in the axial direction at the other Supporting surface 12 of the two axially facing support surfaces 11, 12 of the first partial ring 10 is supported and thereby clamped between them in the axial direction.

This spring means 30 is partially arranged in the groove 13 of the first partial ring 10 and partially in a groove 23 of the second partial ring 20 or frictionally secured and thus acts at the same time as a securing means that secures the dowel pins 40 in the axial direction.

A support surface 25 of the second partial ring 20 is located radially outward (from above in FIG Fig. 1 ) on a mating surface 15 of the first part ring 10.

For producing the inner ring, the support surface 11 and counter surface 15 of the first part ring 10 and the support surface 21 and support surface 25 of the second part ring 20 are first finished, arranged on each other and both partial rings 10, 20 clamped together in the axial direction by means not shown clamping means, so that support surface 11 and support surface 21 are pressed against each other.

In this state, the holes 14, 24, 52 are finished and the two partial ring 10, 20 segmented in the circumferential direction in each case in two halves.

Subsequently, the two partial rings 10, 20 are released from each other again and moved in opposite directions to each other for mounting in the axial direction, wherein they enclose the bearing pin 51 of the guide vanes 50. Then, the dowel pins 40 are inserted and then the spring means 30 in the grooves 13, 23 attached.

Fig. 2 shows a part of a guide grid of a turbomachine with an inner ring according to a further embodiment of the present invention in Fig. 1 corresponding representation. Corresponding features are identified by identical reference numerals, so that reference is made to the preceding description and will be discussed below only differences.

In the execution of Fig. 2 the support surface 12 of the first part ring 10 is curved and not arranged in a groove, but on a radial collar 16, which in turn is arranged on the mating surfaces 15 of the first part ring 10.

The second sub-ring 20, which is in the execution of Fig. 2 supported directly on the support surfaces 11, 12 of the first part of ring 10 may be between these braced or be by an axial distance between the support surfaces 11, 12 is slightly shorter than an axial distance between these contacting support surfaces 21, 22 at undeformiertem second Partial ring 20.

For producing the inner ring, first the support surfaces 11, 12 and counter surface 15 of the first part ring 10 and the support surfaces 21, 22 and support surface 25 of the second part ring 20 are finished, arranged on each other and both partial rings 10, 20 clamped together in the axial direction by means not shown clamping means ,

In this state, the holes 14, 24, 52 are finished and the two partial rings 10, 20 segmented in the circumferential direction in each case in two halves.

Subsequently, the two partial ring 10, 20 are released from each other and moved in opposite directions to each other for mounting in the axial direction, wherein they enclose the bearing pin 51 of the vanes 50, wherein the curvature of the support surface 12 favors assembly. Then, the dowel pins 40 are inserted and then the securing means 30 are secured in grooves of the first part ring 10.

Fig. 3 shows a part of a guide grid of a turbomachine with an inner ring according to a further embodiment of the present invention in Fig. 1, 2 corresponding representation. Corresponding features are identified by identical reference numerals, so that reference is made to the preceding description and will be discussed below only differences.

In the execution of Fig. 3 the support surface 12 of the first part ring 10 is flat and not in a groove, but arranged on a radial end flange 17 which limits the mating surfaces 15 of the first part ring 10.

The second sub-ring 20, which is in the execution of Fig. 3 is also supported directly on the support surfaces 11, 12 of the first part ring 10, is clamped in the axial direction between these with a shrink or press fit.

For this purpose, it has radially inwardly an annular groove 26 for reducing its rigidity in the axial direction.

For producing the inner ring, the axially facing support surfaces 11, 12 and the counter surface 15 of the first partial ring 10 and the support surfaces (in FIG Fig. 3 is only the support surface 21 provided with reference numerals) and bearing surface of the second sub-ring 20 finished, arranged on each other and both sub-rings 10, 20 clamped together in the axial direction by the second sub-ring 20 is shrunk.

In this state, the holes 14, 24, 52 are finished and the two partial rings 10, 20 segmented in the circumferential direction in each case in two halves.

Subsequently, the two partial ring 10, 20 are released from each other again and moved towards the assembly in the axial direction in opposite directions, wherein they enclose the bearing pin 51 of the vanes 50, wherein the small radial height of the end flange 17 favors shrinking of the second partial ring 20 for assembly. Then, the dowel pins 40 are inserted and then the securing means 30 are secured in grooves of the first part ring 10.

Although exemplary embodiments have been explained in the foregoing description, it should be understood that a variety of modifications are possible.

Thus, in particular in an in Fig. 1-3 Dashed line indicated modification, the securing means 30 may be formed as a one-piece or multi-piece wedge with increasing wall thickness in the circumferential direction, the or its parts are inserted in the circumferential direction in the grooves 13, 23 and fixed therein by friction.

It should also be noted that the exemplary embodiments are merely examples that are not intended to limit the scope, applications and construction in any way. Rather, the expert is given by the preceding description, a guide for the implementation of at least one exemplary embodiment, with various changes, in particular with regard to the function and arrangement of the components described, can be made without departing from the scope, as it turns out according to the claims and these equivalent combinations of features.

LIST OF REFERENCE NUMBERS

10

first part ring

11, 12

support surface

13

groove

14

drilling

15

counter surface

16

Federation

17

end flange

19

poetry

20

second part ring

21, 22

supporting

23

groove

24

drilling

25

bearing surface

26

ring groove

30

Spring and / or securing means

40

dowel

50

vane

51

spigot

52

drilling

Claims (15)

Axially split inner ring for attachment to, in particular adjustable, guide vanes (50) of a turbomachine, in particular a compressor or turbine stage of a gas turbine having a first part ring (10) and a second part ring (20) in the axial direction directly or indirectly is supported on two axially facing support surfaces (11, 12) of the first partial ring (10) and fixed in the radial direction by a plurality of circumferentially distributed dowel pins (40) on the first partial ring (10). Inner ring according to the preceding claim, characterized in that the second partial ring (20) in the axial direction between the two mutually facing support surfaces (11, 12) of the first partial ring (10) is braced. Inner ring according to the preceding claim, characterized in that the second partial ring (20) has at least one annular groove (26) for reducing a stiffness in the axial direction. Inner ring according to one of the preceding claims, characterized in that the second partial ring (20) contacts the two mutually facing support surfaces (11, 12) of the first partial ring (10) or between the second partial ring (20) and at least one (12) of the two facing one another supporting surfaces (11, 12) is arranged a spring means (30) for clamping the second partial ring (20) between the support surfaces (11, 12). Inner ring according to one of the preceding claims, characterized in that at least one of the dowel pins (40) frictionally inserted into a blind hole or through-hole (14, 24) in the first and / or second partial ring (10, 20) and / or by a securing means ( 30) is secured in the axial direction, which is fixed to at least one of the partial rings (10, 20). Inner ring according to the two preceding claims, characterized in that the securing means (30) is wedge-shaped and / or has the spring means (30), in particular. Inner ring according to any one of the preceding claims, characterized in that a bearing surface (25) of the second partial ring (20) in the radial direction, in particular radially on the outside, on a counter-surfaces (15) of the first part ring (10) rests. Inner ring according to one of the preceding claims, characterized in that at least one (12) of the support surfaces on a radial flange (16, 17) or in a radial groove (13) of the first partial ring (10) is arranged. Inner ring according to one of the preceding claims, characterized in that the first and / or second partial ring (10, 20) is segmented in the circumferential direction. Inner ring according to one of the preceding claims, characterized by a, in particular with the first and / or second part ring (10, 20) integrally formed or attached to the first and / or second part ring (10, 20), radial seal (19). Inner ring according to one of the preceding claims, characterized in that the first and second partial ring (10, 20) together, in particular coated, blind hole or passage recesses (52) for attachment to the, in particular coated, vanes (50) form, in particular, in particular coated bushings for supporting the guide vanes (50). Guiding grille for a turbomachine, in particular a compressor or turbine stage of a gas turbine, with an axially divided inner ring according to one of the preceding claims and, in particular adjustable, guide vanes (50) to which the inner ring is attached. Turbomachine, in particular gas turbine, with at least one compressor or turbine stage with an axially divided inner ring according to one of the preceding claims. Method for producing an axially divided inner ring according to one of the preceding claims, wherein the first and / or second partial ring (10, 20) machined, in particular recesses (14, 24, 52) for the dowel pins (40) and / or guide vanes (50). produced and / or the partial ring (10, 20) are segmented, while at least one, in particular finished, the support surfaces (11, 12) of the first part ring and a, in particular finished, support surface (21, 22) of the second part ring arranged on each other and pressed against each other. Method for mounting an axially divided inner ring according to one of the preceding claims, wherein the second partial ring (20) in the axial direction between the two mutually facing support surfaces (11, 12) of the first partial ring (10) braced and in the radial direction by the dowel pins (40 ) is fixed to the first part ring (10).

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