EP2871325A1 - Inner ring of a turbine engine and vane cluster - Google Patents

Abstract

The present invention relates to an inner ring (100) of a turbomachine, for attachment to guide vanes (5) and for receiving sealing segments, with fixing rings and seal carriers, wherein the fixing rings in at least two fixing ring segments (1) and the seal carrier in at least two seal carrier segments (3). and wherein the Fixierungsringsegmente (1) and the seal carrier segments (3) are each arranged frontally to each other, and a first Fixierungsringsegment (1) has a first Ringsegmentabsatz (27) and a second Fixierungsringsegment (1) an offset second Ringsegmentabsatz (27) a first seal carrier segment (3) has a first carrier segment shoulder (15), and a second seal carrier segment (3) has a second carrier segment shoulder (15) offset from the first carrier segment shoulder (15), the first carrier segment shoulder (15) being in a division plane (29) of the inner ring (100) forehead side abuts the second ring segment paragraph (27), and that the second carrier segment paragraph (15) in the dividing plane (29) abuts the front side on the first ring segment paragraph (27). Furthermore, the present invention relates to a stator of a turbomachine with guide vanes (5) having an inner ring (100).

Description

The present invention relates to an inner ring of a turbomachine according to the preamble of claim 1. Furthermore, the present invention relates to a stator according to claim 11.

In turbomachines, especially in axial gas turbines, inner rings are often attached to guide wheels at the radially inner end, to which seals can be attached. The seals serve to seal the flow medium between upstream and downstream blade regions. For the inner rings, there are different embodiments, for example, to realize an attachment of the inner ring on the stator, an attachment of seals on the inner ring, a simple assembly and disassembly for maintenance and repair purposes and cost-effective production.

An object of the present invention is to propose an inner ring for turbomachines, which allows easy assembly and disassembly of individual segments of the inner ring and is inexpensive to manufacture. It is another object of the present invention to provide a stator with an inner ring according to the invention.

The object of the invention is achieved by an inner ring having the features of claim 1. It is further achieved by a stator with the features of claim 11.

According to the invention, therefore, an inner ring of a turbomachine, in particular an axial flow machine, and further in particular an axial gas turbine, for attachment to guide vanes and for receiving sealing segments is proposed. The multi-part inner ring has at least one fixing ring and a seal carrier. Both the fixation ring and the seal carrier are subdivided or segmented into at least two segments in the circumferential direction. These fixing ring segments and seal carrier segments are each arranged on the front side relative to one another in the circumferential direction of the inner ring.

According to the invention, the fixing ring segments have ring segment heels. A first fixing ring segment has a first ring segment shoulder, a second fixing ring segment has a relation to the first offset second ring segment paragraph. The second ring segment paragraph is arranged offset from the first ring segment paragraph. In particular, the second ring segment shoulder is offset radially relative to the first ring segment shoulder.

Furthermore, according to the invention, a first seal carrier segment has a first carrier segment shoulder and a second seal carrier segment has a second carrier segment shoulder which is offset with respect to the first carrier segment shoulder. The second carrier segment paragraph is offset from the first carrier segment paragraph. In particular, the second carrier segment shoulder is arranged offset radially with respect to the first carrier segment shoulder.

The first ring segment paragraph is arranged in a parting plane of the inner ring at least partially end face in the circumferential direction on the second carrier segment paragraph or is this. Furthermore, the second ring segment paragraph lies in this division plane, at least in sections, on the end face in the circumferential direction to the first carrier segment paragraph.

In particular, the first fixing ring segment and the first seal carrier segment are not displaceable, preferably completely or substantially, in the circumferential direction over the dividing plane. The segments are not slidable over the dividing plane because the first ring segment shoulder prevents or blocks displacement by abutment with the second carrier segment shoulder.

Furthermore, in particular the second fixing ring segment and the second seal carrier segment are not displaceable, preferably completely or substantially, in the circumferential direction over the dividing plane. The segments are not slidable over the parting plane because the second ring segment shoulder prevents or blocks displacement by abutment with the first carrier segment shoulder.

The stator according to the invention has an inner ring according to the invention.

In all the above and following embodiments, the use of the term "may be" or "may have" etc. is synonymous with "preferably" or "preferably has", etc., and is intended to explain embodiments of the invention.

Whenever numerical words are mentioned herein, those skilled in the art will understand these as indicating a numerically lower limit. If this does not result in a contradiction that is recognizable to the person skilled in the art, the person skilled in the art therefore always reads "at least one" or "at least one", for example, when specifying "a" or "one". This understanding is also encompassed by the present invention as the interpretation that a numerical word such as "a" may alternatively be meant as "exactly one" wherever technically possible for those skilled in the art. Both are encompassed by the present invention and apply to all number words used herein.

Advantageous developments of the present invention are the subject of subclaims and embodiments.

Inventive exemplary embodiments may have one or more of the following features.

In the following, gas turbines will be described purely by way of example purely as turbomachines, but without wishing to restrict turbomachines to gas turbines. The turbomachine may in particular be an axial flow machine. The gas turbine may in particular be an axial gas turbine, for example an aircraft gas turbine.

In certain embodiments according to the invention, the second ring segment shoulder is offset radially relative to the first ring segment shoulder. Alternatively or additionally, the second ring segment paragraph can be arranged offset from the first ring segment paragraph axially, diagonally or in another arrangement.

In certain embodiments according to the invention, the second carrier segment shoulder is offset radially relative to the first carrier segment shoulder. Alternatively or additionally, the second carrier segment shoulder can be arranged offset from the first carrier segment shoulder axially, diagonally or in another arrangement.

In some embodiments of the invention, the inner ring, in particular the inner ring fixation ring, is connected to the radially inner end of the vane or attached to the vane.

In some embodiments of the inner ring according to the invention, one or more sealing linings, in particular inlet seal linings, are preferably fastened to the radially inner ends of the seal carrier segments. The gaskets may be parts or portions of the inner ring.

In certain embodiments of the invention, the inner ring has connecting pins in the circumferential direction for connecting in each case two adjacent fixing rings. In particular, the connecting pins are arranged on or in parting planes of the inner ring.

In certain embodiments of the inner ring according to the invention, the fixing ring segments have no further pins, shoulders, parallel keys or the like in order to support or fix the fixing ring segments, for example, against radially adjacent further inner ring segments.

In some embodiments of the invention of the inner ring, the first Fixierungsringsegment supported on the one hand against the second Fixierungsringsegment in the circumferential direction in a first parting plane, on the other hand additionally supports the first Ringsegmentabsatz the first Fixierungsringsegments against the second Trägersegmentabsatz of the second seal carrier segment from, in particular in the first parting plane.

In certain embodiments of the inner ring according to the invention, the first seal carrier segment is supported on the one hand against the second seal carrier segment in the circumferential direction in a parting plane, in particular in the first parting plane, on the other hand supports the first Trägersegmentabsatz the first seal carrier segment against the second ring segment paragraph of the second Fixierungsringsegments from, in particular in the first division level.

In some embodiments of the inner ring according to the invention, the first ring segment shoulder is integrally connected to the first fixing ring segment and / or the second ring segment shoulder is integrally connected to the second fixing ring segment. As integral Connection is understood in particular to be a one-piece connection, for example a one-piece component which is produced as a component by casting or which is machined as a component.

In some embodiments of the inner ring according to the invention, the first ring segment shoulder is connected by means of a joining method, for example by means of welding or soldering, to the first fixing ring segment and / or the second ring segment shoulder to the second fixing ring segment.

In certain embodiments of the inner ring according to the invention, the first carrier segment shoulder is integrally connected to the first seal carrier segment and / or the second carrier segment shoulder is integrally connected to the second seal carrier segment.

In certain embodiments of the inner ring according to the invention, the first and second fixing ring segments and / or the first and second seal carrier segments each have a circumferential angle of 180 degrees. With a circumferential angle of 180 degrees, the two halves can support each other. In particular, the two peripheral halves are not supported by any other components. The circumferential securing of the two peripheral halves thus takes place in particular at a dividing plane for the seal carrier segments.

In certain embodiments according to the invention, the fixing ring segments are supported on guide blade pins. Vanes may be pins or pins at the radially inner end of the vane to connect the vanes to the fixation ring segments.

In some embodiments of the inner ring according to the invention, the first and second fixing ring segments and / or the first and second seal carrier segments each have a circumferential angle of 120 degrees or 90 degrees or 60 degrees or another angle.

In some embodiments of the inner ring according to the invention, the first carrier segment shoulder is arranged at the radially outer end of the seal carrier segment. In particular, the first carrier segment shoulder is arranged on a dividing plane of the inner ring and bears against a radially outer end arranged on the front side ring segment paragraph of a Fixierungsringsegments. This fixation ring segment can be arranged adjacent to the seal carrier segment in the circumferential direction.

In certain exemplary embodiments of the inner ring according to the invention, the first and / or the second carrier segment shoulder and / or the first and / or the second ring segment shoulder each extend over the entire circumferential length of the respective seal carrier segment or fixing ring segment. The seal carrier segment and / or the Fixierungsringsegment can be advantageously prepared in this embodiment as a rotating part. The respective rotary part, the seal carrier and / or the fixing ring can be divided after the first production step as a rotary part, for example, in two 180 degree segments, which can be used in each case in an inner ring.

In certain embodiments of the inner ring according to the invention, the carrier segment shoulders and / or the ring segment shoulders each extend over a smaller circumferential length with respect to the circumferential length of the respective seal carrier segment or fixing ring segment. For example, the paragraphs may extend over 10 or 20 degrees in the circumferential direction, wherein the segments include, for example, 180 degrees.

In some exemplary embodiments of the inner ring according to the invention, the first and / or second carrier segment shoulder is disposed on an axially downstream, radially extending portion of the respective seal carrier segment. This section can be referred to as a so-called bulkhead.

In certain exemplary embodiments of the inner ring according to the invention, the ratio of the axial width to the radial extent of the section is 1: 6 or less, for example 1:10, 1:20 or 1:30, the axial width being determined without the carrier segment shoulder. For example, the axial width is about 4 mm and the radial extent of the section about 24 mm, or the axial width is about 3 mm and the radial extent of the section about 18 mm. By means of both the ratio of the axial width to the radial extent and the absolute dimensions can advantageously be influenced or changed the bending stiffness of the seal carrier segment.

In certain embodiments according to the invention of the inner ring, the first and / or the second fixing ring segment has at least one hole in the circumferential direction at one or both front end (s). This hole can be a receptacle or a recess. The bore is in particular for receiving a pin for connecting the Fixation ring segments provided and designed. The pins may be the same or different in two or more pitch planes of the inner ring. For example, the pins may have different lengths or have different diameters. Preferably, the pins are designed identically in all graduation planes.

In some exemplary embodiments of the inner ring according to the invention, the first and / or the second seal carrier segment has inlet seals for sealing against a flow medium of the axial flow machine. In particular, all seal carrier segments on their radially inner side inlet seals.

In certain embodiments of the invention, the stator is connected to a housing of an axial compressor, in particular a high-pressure axial compressor.

In certain embodiments of the invention, the inner ring has no pin (or other positioning arrangement or positioning aid, in particular for the Fixierungsringsegmente)

Some or all embodiments according to the invention may have one, several or all of the advantages mentioned above and / or below.

The seal carrier segments can be pushed in the assembly of the inner ring according to the invention on the Fixierungsringsegmente in the circumferential direction. The seal carrier segments may then be advantageously secured against circumferential displacement or rotation (circumferential rotation) by means of the radially offset carrier segment and annular segment heels so as not to interfere with the circumferentially adjacent one of the dividing planes in the intended operation of the guide vanes in the gas turbine Can push fixation ring. Such a shift beyond the dividing plane could complicate the dismantling of housing halves (split case) with the inner rings or completely block.

With the inner ring according to the invention a faulty mounting can be advantageously prevented, since the respective segments (preferably two 180 degree halves) of the seal carrier and fixing rings are designed differently due to the radially offset paragraphs (Trägersegmentabsätze and Ringsegmentabsätze). For example, none will be advantageous two identical seal carrier segments used for an inner ring, on the one hand, the first seal carrier segment does not fit on the first Fixierungsringsegment, and on the other hand, the second Dichtungsträgersegmnet does not fit on the second Fixierungsringsegment.

Furthermore, the structural design of the bulkhead can advantageously be optimized with regard to the bending stiffness of the seal carrier by means of the inner ring according to the invention. A higher bending stiffness of the seal carrier can reduce the so-called "cording effect". A "cording effect" is a thermal effect, especially in the case of fixing rings, which can lead to a three-dimensional deformation of the inner rings at the dividing planes. These deformations can lead to a stronger inlet of sealing fins in the inlet seals, which can increase the sealing gaps and leaks. Larger leaks can reduce the efficiency. By the targeted design of the bulkhead (eg axial width, radial extent), the bending stiffness of the seal carrier can be increased. A higher bending stiffness can counteract the "cording effect", whereby a radially lower inlet of the sealing fins into the inlet seal at the parting planes can be reduced. Thus, the efficiency can be positively influenced.

Due to the design of the shoulders (eg axial width, radial extent), the bending stiffness can be further optimized advantageously.

Fig. 1

zeigt eine stirnseitige Draufsicht auf ein Fixierungsringsegment und ein Dichtungsträgersegment eines erfindungsgemäßen Innenrings;

Fig. 2

zeigt eine stirnseitige Draufsicht auf ein Dichtungsträgersegment eines erfindungsgemäßen Innenrings mit radial äußerem Trägersegmentabsatz;

Fig. 3

zeigt eine stirnseitige Draufsicht auf ein Dichtungsträgersegment eines erfindungsgemäßen Innenrings mit radial mittigem Trägersegmentabsatz;

Fig. 4

zeigt eine stirnseitige Draufsicht auf ein Fixierungsringsegment eines erfindungsgemäßen Innenrings mit einem radial äußeren Ringsegmentabsatz;

Fig. 5

zeigt eine stirnseitige Draufsicht auf ein Fixierungsringsegment eines erfindungsgemäßen Innenrings mit einem radial inneren Ringsegmentabsatz;

Fig. 6

zeigt eine perspektivische Ansicht eines erfindungsgemäßen Innenrings mit zwei Dichtungsträgersegmenten und einem Fixierungsringsegment; und

Fig. 7

zeigt eine weitere perspektivische Ansicht eines erfindungsgemäßen Innenrings mit zwei Dichtungsträgersegmenten und einem Fixierungsringsegment.

The present invention will be explained in the following with reference to the accompanying drawings, in which identical reference numerals designate identical or similar components, by way of example. In each schematically simplified figures:

Fig. 1

shows a frontal plan view of a fixing ring segment and a seal carrier segment of an inner ring according to the invention;

Fig. 2

shows a frontal plan view of a seal carrier segment of an inner ring according to the invention with radially outer carrier segment paragraph;

Fig. 3

shows a frontal plan view of a seal carrier segment of an inner ring according to the invention with radially central carrier segment paragraph;

Fig. 4

shows a frontal plan view of a fixing ring segment of an inner ring according to the invention with a radially outer ring segment paragraph;

Fig. 5

shows a frontal plan view of a fixing ring segment of an inner ring according to the invention with a radially inner ring segment paragraph;

Fig. 6

shows a perspective view of an inner ring according to the invention with two seal carrier segments and a Fixierungsringsegment; and

Fig. 7

shows a further perspective view of an inner ring according to the invention with two seal carrier segments and a Fixierungsringsegment.

Fig. 1 shows an inner ring 100 according to the invention in a frontal plan view of a Fixierungsringsegment 1 and a seal carrier segment 3. The plane of the plan view is a parting plane of the inner ring 100th

Inner ring 100 is attached at its radially outer end to the radially inner end of a vane 5. The inner ring 100 also has inlet seals 7 (or inlet seal linings).

The fixing ring segment 1 and the seal carrier segment 3 are pushed one into the other in the circumferential direction. For this connection with a degree of freedom in the circumferential direction u, the fixing ring segment 1 has a slide 9, which is guided in a guide 11 of the seal carrier segment 3.

The seal carrier segment 3 has a radially extending section 13 with an integral carrier segment shoulder 15. The radially extending portion 13 is also referred to as a bulkhead 13.

The fixing ring segment 1 has a bore 17 for connecting two adjacent fixing ring segments 1
on. In the bore 17, a pin 31 (s. FIG. 6 and 7 ) are inserted to connect the two Fixierungsringsegmente 1 frontally in the parting plane with each other.

Fig. 2 shows a frontal plan view of the seal carrier segment 3 of the inner ring 100 according to the invention with radially outer carrier segment paragraph 15th

The individual dimensions of the bulkhead wall 13 can substantially influence or change the bending stiffness of the seal carrier segment 3. The bulkhead wall can be characterized, for example, by the ratio of the axial width 19 to the radial extent 21. Furthermore, the flexural rigidity of the bulkhead can be further influenced and optimized by the axial width 23 and radial length 25 of the carrier segment paragraph 15.

Fig. 3 The position and position of the Trägersegmentabsatz 15 on or on the bulkhead 13 is crucial for the support function of the seal carrier segment 3 against the frontally adjacent further inner ring segments (in Fig. 3 not shown).

The carrier segment shoulder 15 in FIG Fig. 3 is radially offset from the carrier segment paragraph 15 in Fig. 2 ,

Fig. 4 shows a frontal plan view of the fixing ring segment 1 of the inner ring 100 according to the invention with a radially outer ring segment paragraph 27th

This fixing ring segment 1 with the radially outer ring segment shoulder 27 is for receiving the seal carrier segment 3 (see Fig. 3 ) intended. The seal carrier segment 3 is initially rotationally displaceable in the circumferential direction. However, if a further seal carrier segment 3 rests against the fixing ring segment 1, the further seal carrier segment 3 can no longer be moved rotationally relative to the first seal carrier segment 3. Thus, the circumferential security in the division level, in which abut the frontal segments, reached.

The bore 17 is provided for receiving a pin for connecting two adjacent Fixierungsringsegmente 1.

Fig. 5 shows a frontal plan view of a fixing ring segment of the inner ring 100 according to the invention with a radially inner ring segment paragraph 27th

This fixing ring segment 1 is provided for receiving the seal carrier segment 3, which is rotationally displaceable in the circumferential direction.

Fig. 6 shows a perspective view of an inner ring 100 according to the invention with two seal carrier segments 3 and a Fixierungsringsegment first

The seal carrier segment 3 (in Fig. 6 the rear seal carrier segment 3) is pushed onto the fixing ring segment 1. At the dividing plane 29, the seal carrier segment 3 (in Fig. 6 the front seal carrier segment 3) with the carrier segment paragraph 15 against the ring segment paragraph 27 of the fixing segment 1 from. The rear and front seal carrier segment 3 are designed differently, due to the radially offset carrier segment paragraphs 15. The radially staggered carrier segment paragraphs 15 and the radially offset arranged ring segment paragraphs 27 (in Fig. 6 If only one ring segment shoulder 27 is shown), they can not shift beyond the dividing plane 29 and thus form a circumferential securing device.

In the hole 17 (s. Fig. 1 and 4 ) is a pin 31 is used to connect the fixing ring segment 1 with another fixing ring segment 1 can.

The depressions 33 are provided and configured for connecting the guide blade 5 to the fixing ring segment 1 of the inner ring 100 according to the invention.

Fig. 7 shows a further perspective view of an inner ring 100 according to the invention with two seal carrier segments 3 and a Fixierungsringsegment first

The fixing ring segment 1 has a radially inner ring segment shoulder 27 (corresponding to FIG Fig. 5 ) on. The carrier segment shoulder 15 of the front seal carrier segment 3 is supported against the ring segment shoulder 27 and prevents displacement of the seal carrier segment 3 beyond the dividing plane 29 in the circumferential direction.

LIST OF REFERENCE NUMBERS

100

inner ring

a

axially; axially

r

radial; radial direction

u

circumferentially

1

Fixing ring segment

3

Seal carrier segment

5

vane

7

Seal segment; Inlet seal; Inlet seal coating

9

carriage

11

guide

13

radial section; bulkhead

15

Carrier segment sales

17

drilling

19

axial width of the bulkhead

21

Radial extension of the bulkhead

23

axial width of the bulkhead

25

radial length or extension of the bulkhead

27

Ring segment sales

29

parting plane

31

pen

33

wells

Claims (12)

Inner ring (100) of a turbomachine, for fastening to guide vanes (5) of the turbomachine and for receiving sealing segments (7), with fixing rings and seal carriers, wherein the fixing rings in at least two fixing ring segments (1) and the seal carrier in at least two seal carrier segments (3). , each in the circumferential direction of the turbomachine, are divided, and wherein the Fixierungsringsegmente (1) and the seal carrier segments (3) are arranged in the circumferential direction in each case frontally to each other,
characterized in that
a first fixing ring segment (1) has a first ring segment shoulder (27), that a second fixing ring segment (1) has a second ring segment shoulder (27) offset from the first ring segment shoulder (27), that a first seal carrier segment (3) has a first carrier segment shoulder (15) in that a second seal carrier segment (3) has a second carrier segment shoulder (15) offset from the first carrier segment shoulder (15), that the first carrier segment shoulder (15) in a parting plane (29) of the inner ring (100) at least partially at the front side on the second ring segment shoulder ( 27) is applied, and that the second carrier segment paragraph (15) in the parting plane (29) at least partially abuts the end face of the first ring segment paragraph (27). The inner ring (100) according to claim 1, wherein the first ring segment shoulder (27) is integrally connected to the first fixing ring segment (1) and / or the second ring segment shoulder (27) is integrally connected to the second fixing ring segment (1) and / or the first carrier segment shoulder (15 ) is integrally connected to the first seal carrier segment (3) and / or the second carrier segment shoulder (15) is integrally connected to the second seal carrier segment (3). Inner ring (100) according to claim 1 or 2, wherein the first and the second fixing ring segment (1) each having a circumferential angle of 180 degrees and / or the first and second seal carrier segment (3) each have a circumferential angle of 180 degrees. Inner ring (100) according to any one of the preceding claims, wherein the first support segment paragraph (15) at the radially outer end of the seal carrier segment (3) is arranged and / or the first Ringsegmentabsatz (27) at the radially outer end of the Fixierungsringsegments (1) is arranged. Inner ring (100) according to one of the preceding claims, wherein the first and / or the second Trägersegmentabsatz (15) and / or the first and / or the second Ringsegmentabsatz (27) each over the entire circumferential length of the respective seal carrier segment (3) or Fixierungsringsegments (1) extends. Inner ring (100) according to one of the preceding claims, wherein the first and / or the second Trägersegmentabsatz (15) disposed on an axially downstream, radially extending portion (13) of the respective seal carrier segment (3). An inner ring (100) according to the preceding claim, wherein the ratio of the radial extent to the axial width of the portion (13) is at least 6: 1. Inner ring (100) according to one of the preceding claims, wherein the first and / or the second fixing ring segment (1) has at least one bore in the circumferential direction at one or both front end (s), the bore (17) receiving a pin (17). 31) for connecting the fixing ring segments (1) is provided and configured. Inner ring (100) according to one of the preceding claims, wherein the first and / or the second seal carrier segment (3) has inlet seals (7) for sealing against a flow medium of the axial flow machine. Inner ring (100) according to one of the preceding claims, wherein the seal carrier segments (3) and / or the Fixierungsringsegmente (1) are made as turned parts. Guide wheel of a turbomachine with guide vanes (5) having an inner ring (100) according to one of the preceding claims. Guide wheel according to claim 11, wherein the stator is connectable to a housing of a compressor, in particular a high-pressure axial compressor.

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