EP2846002B1 - Gas turbine - Google Patents

Description

The present invention relates to a gas turbine having a housing, an outer sealing ring, which is releasably attachable to the housing, and a clamping element for radially clamping the outer sealing ring and the housing against each other.

From the US 2007/0231132 A1 is a gas turbine with a housing, an outer sealing ring, which is releasably secured to the housing, and a C-clip known which braces the outer sealing ring and the housing radially against each other. As a result, the outer sealing ring is frictionally secured in the circumferential direction.

In order to avoid vibration-induced micro-movements in the axial direction between the sealing ring and housing, the document proposes to arrange a radial flange of the sealing ring axially positively between the C-clip and the housing. In operation, the C-clip is acted upon by the gas force in the flow direction and thus clamps the radial flange of the sealing ring against the housing.

In relative movements, in particular as a result of different thermal deformations, of the sealing ring and housing this clamping exerts a high frictional force, which leads to correspondingly high wear.

The sake of completeness is also on the FR 2 891 583 A1 which also discloses the features of the preamble of claim 1.

In addition, be on the DE 601 22 083 T2 which discloses two ring-segment-shaped components of a turbomachine, which are clamped by means of a C-shaped clamping element against each other in the radial direction, wherein a radial flange of a component engages in a groove of the other component and thus provides as rotation.

An object of one embodiment of the present invention is to provide an improved gas turbine.

This object is solved by the features of claim 1. Advantageous embodiments of the invention are the subject of the dependent claims.

According to one aspect of the present invention, a gas turbine, in particular an aircraft engine gas turbine, a housing, an outer sealing ring, which is detachably fastened to the housing fastened, in particular fastened, and a clamping element for radially clamping the outer sealing ring and the housing against each other, which in a version of the outer sealing ring and the housing clamped radially against each other and so frictionally secured together.

An anti-rotation device for preventing rotation or positive limiting a relative movement in the circumferential direction between the housing and outer sealing ring has one or more in the circumferential direction of each other, preferably at least substantially equidistant, spaced housing grooves, which extend in an embodiment, at least substantially, in the axial direction. In the radial direction, the groove (s) may be radially open or closed radially, with radially outwardly open grooves advantageously can be advantageous manufacturing and / or assembly technology, radially outwardly closed grooves, however, can advantageously protect the rotation.

In one or more, preferably all housing grooves in each case engage one or more radial flanges of the outer sealing ring and (twist) secure the housing and outer sealing ring in a form-fitting manner in the circumferential direction. As a result, in one embodiment, a radial tension or a frictional engagement between the housing and the outer sealing ring and thus wear can be reduced.

According to one aspect of the present invention, the one or more radial flanges are arranged with play in the axial direction in the housing or the grooves. As a result, in one embodiment, the initially explained high axial clamping force as a result of the gas force during operation can be reduced, preferably avoided, and so wear can be reduced.

In addition, the one or more radial flanges can be arranged with play in the circumferential direction in the housing or the grooves. As a result, in one embodiment, the assembly can be simplified and / or manufacturing tolerances and / or thermal deformations can be compensated.

According to one aspect of the present invention, the housing groove (s) is / are open at the end side opposite to the throughflow direction. In other words, the housing groove (s) open or open into a front side of the housing in the direction of flow or open into it. As a result, in one embodiment, after removal of the clamping element, the sealing ring can advantageously be pulled axially out of its mounting position out of the housing front or housing because its radial flange (e) need not be removed from a groove closed against the direction of flow For example, by initial tilting or the like.

In one embodiment, an axial length of the housing groove (s) from a housing front side in the direction of flow is greater than an axial wall thickness of the radial flange or the radial flanges. As a result, the above-explained aspects of the anti-rotation device, which is open against the direction of flow, can be advantageously represented with axial play. In the present case, an axial length is understood to mean, in particular, the length of a groove section in the axial direction which extends from the opening in the front housing front side in the throughflow direction and can accommodate the radial flange, in particular a free path length of the radial flange in the direction of flow.

In one embodiment, the outer sealing ring is divided or segmented into two or more ring segments. As a result, in one embodiment, advantageously the production, assembly and / or disassembly can be improved.

In one embodiment, the clamping element is annular, ring-shaped in another embodiment. In particular, the clamping element can be designed in several parts and have two or more, over the circumference, in particular at least substantially equidistantly, distributed ring segments, wherein the sum of the circumferential lengths the ring segments correspond to the circumferential length of the rotation, but also, in particular, may be lower.

In particular, the clamping element may have one or more so-called C-clips. In general, the clamping element in one embodiment has a, in particular C- or U-shaped, cross-section with a radially outer limbs, which is supported on an outer peripheral surface of the housing, and a radially inner legs, which is supported on an inner peripheral surface of the outer sealing ring element the radially outer leg, the radially inner leg and / or a connection between the two legs is elastically deformed so as to radially clamp housing and outer sealing ring against each other.

In one embodiment, the gas turbine has a rotor which is arranged radially opposite the outer sealing ring element in the housing. The rotor or the outer sealing ring element may in particular be a first, a gas inlet next or in the flow direction first rotor or a foremost, a gas inlet next or in the flow direction first outer sealing ring element. When the gas turbine has a high-pressure turbine and a low-pressure turbine downstream of it, the rotor or the outer-sealing-ring element may be the first of the high-pressure turbine or the low-pressure turbine. Accordingly, the housing may be the housing of the high-pressure turbine or the low-pressure turbine.

Fig. 1

einen Teil einer Gasturbine in Fig. 3 entsprechender Darstellung nach einer Ausführung der vorliegenden Erfindung;

Fig. 2

einen Schnitt längs der Linie II-II in Fig. 1; und

Fig. 3

einen Teil einer Gasturbine nach dem Stand der Technik in einem Meridianschnitt.

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 part of a gas turbine in Fig. 3 corresponding representation according to an embodiment of the present invention;

Fig. 2

a section along the line II-II in Fig. 1 ; and

Fig. 3

a part of a gas turbine according to the prior art in a meridian section.

Fig. 3 shows a part of a gas turbine according to Fig. 2 of the US 2007/0231132 A1 ,

The gas turbine of Fig. 3 has a housing 1 'to which an outer sealing ring 2' is attached with a Honigwabendichtung. For this purpose clamps a C-clip 3 'an annular radial flange 20' of the sealing ring axially positive fit against the housing. In operation, the C-clip is acted upon by the gas force on a preceding vane 12 in the flow direction and thus clamps the radial flange of the sealing ring against the housing.

Fig. 1 shows in Fig. 3 corresponding representation of a section along the line II in Fig. 2 a portion of an aircraft engine gas turbine according to an embodiment of the present invention. Fig. 2 shows a section along the line II-II in Fig. 1 , Corresponding elements are designated by the same reference numerals distinguished by an apostrophe.

This comprises a housing 1, an outer sealing ring 2, which is releasably secured to the housing, and a clamping element 3, which is the outer sealing ring and the housing radially (vertically in Fig. 1 ) clamped against each other and so frictionally secured together.

Housing 1 and outer sealing ring 2 have an anti-rotation with a plurality of circumferentially spaced apart housing grooves 10 which extend in the axial direction (horizontally in Fig. 1, 2 ). In the radial direction, the grooves are radially outward (top in FIG Fig. 1 ) open.

In each housing groove 10 of the housing 1 engages in each case a radial flange 20 of the outer sealing ring 2, thus securing the housing and outer sealing ring in a form-fitting manner in the circumferential direction (vertically in FIG Fig. 2 ).

The radial flanges are arranged with play s _a in the axial direction in the housing grooves. In addition, the radial flanges also play in the circumferential direction to the housing grooves, which in Fig. 2 is recognizable.

The housing grooves are frontally opposite to the direction of flow (to the left in Fig. 1, 2 ) open. In other words, the housing grooves open or open into a housing front side 11 in the direction of flow. As a result, after the clamping element 3 has been removed, the sealing ring 2 can advantageously be axially opposite to the throughflow direction (to the left in FIG Fig. 1, 2 ) from his in Fig. 1, 2 shown mounting position out of the housing end face 11 and the housing 1 are pulled out.

The axial length t _{1 of} the housing grooves 10 from the housing front side 11 in the direction of flow is greater than the axial wall thickness t _{2 of} the radial flanges 20.

The outer sealing ring is divided into several ring segments or segmented (not shown).

The clamping element is formed in several parts ring segment-shaped and has a plurality of distributed over the circumference ring segments in the form of C-clips. Accordingly, the clamping element has an in Fig. 1 recognizable C-shaped cross section with a radially outer leg 31 which is supported on an outer peripheral surface of the housing 1, and a radially inner leg 32 which is supported on an inner peripheral surface of the outer sealing ring element 2, wherein the radially outer leg, the radially inner leg and / or a connection between the two legs is elastically deformed so as to radially clamp housing and outer sealing ring against each other.

The gas turbine has a first rotor 18 in the direction of flow (in FIG Fig. 1 not shown, cf. For this Fig. 3 ).

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

LIST OF REFERENCE NUMBERS

1; 1'

casing

10

housing groove

11

Body face

12

vane

18

rotor

2; 2 '

Outer sealing ring

20, 20 '

radial flange

3; 3 '

C-clips (clamping element)

31; 31 '

first leg

32; 32 '

second leg

Claims (8)

1. Gas turbine comprising a housing (1), an outer sealing ring (2) which can be detachably fastened to the housing (1), and a clamping element (3) for radially clamping the outer sealing ring (2) and the housing (1) against one another, characterized by an anti-rotation mechanism which has at least one housing groove (10) and a radial flange (20) of the outer sealing ring (2), which flange can be form-fittingly secured against rotation in the housing groove (10) with clearance (s_a) in the axial direction.
2. Gas turbine according to claim 1, characterized in that the housing groove (10) is open on the end face counter to the flow direction.
3. Gas turbine according to either of the preceding claims, characterized in that an axial length (t₁) of the housing groove (10) from a housing end face (11) which is at the front in the flow direction is greater than an axial wall thickness (t₂) of the radial flange (20).
4. Gas turbine according to any of the preceding claims, characterized in that the outer sealing ring (2) is segmented.
5. Gas turbine according to any of the preceding claims, characterized in that the clamping element (3) is in the form of a ring or ring segment.
6. Gas turbine according to any of the preceding claims, characterized in that the clamping element (3) has a cross section, which is in particular C- or U-shaped, having two legs (31, 32), of which one (31) is supported on an outer circumferential surface of the housing (1) and the other (32) is supported on an inner circumferential surface of the outer sealing ring (2) such that the clamping element (3) is elastically deformed.
7. Gas turbine according to any of the preceding claims, characterized by a rotor (18), in particular a first rotor in the flow direction, which is arranged in the housing (1) opposite the outer sealing ring (2).
8. Gas turbine according to any of the preceding claims, characterized in that the radial flange (20) can be form-fittingly secured against rotation in the housing groove (10) with clearance in the circumferential direction.

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