WO2012041651A1

WO2012041651A1 - Blade ring segment, turbomachine and method for producing same

Info

Publication number: WO2012041651A1
Application number: PCT/EP2011/065289
Authority: WO
Inventors: Anton Wimmer; Frank Truckenmüller
Original assignee: Siemens Aktiengesellschaft
Priority date: 2010-09-30
Filing date: 2011-09-05
Publication date: 2012-04-05
Also published as: CN103119249A; DE102010041808B4; DE102010041808A1; EP2603668A1

Abstract

The invention relates to a blade ring segment (2, 2') for a turbomachine (17), in particular a turbine, comprising a first blade (1) and a second blade (1'), wherein the first blade (1) is positively connected to the second blade (1').

Description

description

Blade segment, turbomachinery and process for their preparation

The invention relates to a blade ring segment, a Strö ^¬ tion machine and a method for their preparation.

According to one of the applicant internally known prior art, a blade ring segment for a turbine is so Herge ^¬ provides that threaded a plurality of Einzelleitschaufeln in grooves in a housing of the turbine and then ver ^{¬ are} clamped. In practice, however, has herausge disadvantageous ^¬ is, an entire blade ring or even a blade ring segment - not be able to produce before the actual installation of the vanes in the housing of the turbine - each with a variety of Leitschau ^¬ feln.

It is therefore an object of the present invention to provide a blade ring segment, a turbomachine and a method for producing the same which avoids the disadvantage described above.

This object is achieved by a blade ^{ring ¬} segment with the features of claim 1, by a turbomachine with the features of claim 9 so ^¬ as by a method having the features of claim 10.

Accordingly, a blade rim segment for a Strömungsma ^¬ machine, in particular a turbine, provided, comprising: a first blade and a second

Blade, wherein the first blade is positively connected to the second blade. Furthermore, a turbomachine, in particular a turbine, is provided with the blade rim segment according to the invention.

Furthermore, a method for manufacturing a blade ring segment, in particular the inventive blade ^¬ shroud segment and / or the fluid machine according to the invention is provided, wherein a first and a second blade are positively connected with each other.

By means of the solution shown, it is possible to mount a blade ring segment with a plurality of blades in advance, and then insert the assembled blade ring segment, for example, in a housing of a turbine.

From the dependent claims, advantageous embodiments of the invention.

In the present case, a "blade ring segment" is to be understood as meaning a segment (<360 °) or else a complete ring (= 360 °).

It is preferable that in the blade ring segment to a Leitschaufelkranzsegment and therefore in the first and th ^¬ two blades respectively to vanes.

According to a preferred embodiment of the blade ring segment according to the invention, the first blade to a positive ^¬ contour and the second blade has a negative contour, which engages in the positive contour-locking manner. Preferably, each of the blades has a positive and negative contours on opposite sides, so that a plurality of blades can be easily connected to each other. More preferably, the positive connection is detachable.

According to a further preferred embodiment of the blade ring segment according to the invention, the positive contour and Ne ^¬ negative contour are formed such that the positive connection by means of a radial relative movement between the first and second ten shovel is produced. As a result, the blade ring segment can be easily assembled. "Radial" here means the main direction of extension of a particular blade. According to a further embodiment of the invention

Blade rim segments, the first blade has a first head and a first foot and the second blade on a two ^¬ th head and a second foot, wherein the first head is positively connected to the second head and / or the first foot with the second foot. Between the first head and the first foot a first leaf is arranged, which is connected to the first head and the first foot. During a later use of the vane ring segment in a turbomachine, the first sheet acts on the fluid flowing through the turbomachine. The same applies to the second leaf connecting the second head to the second foot.

According to a further preferred embodiment of the blade ring segment according to the invention, the negative contour is formed radially outward on the second head and / or second foot and the positive contour radially outward on the first head and / or first foot, wherein preferably also the negative contour radially open for engagement of the positive contour is trained. In this case, "radially outward" refers to a radius starting from an intersection between two imaginary lines which extend along the main extension directions of the first and second blades. In a later use of the vane ring segment in a turbomachine, said intersection coincides with the rotor axis.

According to a further preferred embodiment of the blade ring segment according to the invention, a connecting ^{element is} seen ^¬ before, which engages on the one hand in the first blade and the other hander ^¬ in the second blade in a form-fitting manner in order to connect them. In contrast to the embodiments described above, where the positive and negative contours are each formed on or in the blade itself, is a separate in the present embodiment Connecting element provided, which engages in negative contours in the first and second Schaute1, wherein the connecting element preferably engages in the first and second head and / or in the first and second foot.

Preferably, the connecting element is arranged in a negative contour radially outward in the first head and / or first foot and in a negative contour radially outward in the second head and / or first foot.

According to a further preferred embodiment of the blade ring segment according to the invention, the connecting element is dovetail-shaped or H-shaped or has a cross section which is composed of two on / on set circles.

According to a further preferred embodiment of the blade ring segment according to the invention, a cohesive connection is also provided, which connects the first blade with the second blade. The cohesive connection is in particular a weld. ^{Instead of} the cohesive connection, however, another positive connection is conceivable which ensures an additional form fit between the first and second blades.

Of course, more than two blades may be provided which form a blade ring segment.

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the accompanying figures of the drawing. Show it:

Fig. 1 m a perspective view of a blade of a blade ring segment according to an exemplary embodiment of the present invention; FIG. 2 is a perspective view of a vane segment according to an embodiment of the present invention having a plurality of the blades shown in FIG. 1; FIG.

3 is an exploded ^{view of} a Schaufelkranzseg ^¬ ment according to another embodiment of the present invention; in perspective, a connecting element according to another embodiment of the present invention; in perspective, a still further Verbindungsele ^¬ ment according to a further embodiment of the invention; and in a perspective view of the blade ^rim segment of Fig. 3, wherein the connection ^¬ elements are inserted into their respective negative contours.

In the figures, like reference numerals designate the same or functionally similar components, unless it is otherwise given to ^¬.

Fig. 1 shows in a perspective view a blade 1 from a blade ring segment 2, see Fig. 2, according to an embodiment of the present invention.

The blade 1 is composed of a head 3, a foot 4 and a sheet 5 connecting them.

The head 3 has on its one side 6 a dovetail-shaped negative contour 7 (ie a recess). On its other side 11, the head 3 has a positive contour 12 (ie, a projection). Accordingly, the foot 4 has on its one side 13 a negative contour 14 and on its other side 15 a positive contour 16. The negative contour 7 is formed in the head 3 radially outside and open. "Radially outward" here refers to the main extension direction H of the blade 1, starting from the center axis M shown in FIG. 2. In other words, the negative contour 7 is open on the side 8 of the head 3 facing away from the blade 5. Accordingly, the negative contour 14 is formed in the foot 4 open radially outward. After radially inward, the negative contours 7 and 14 are each formed closed. In the blade 1 is in particular a Leit ^¬ shovel. The blade 1 can be formed from steel, titanium or a Ke ^¬ ramik.

Fig. 2 shows the blade ring segment 2 in a perspective view.

The blade ring segment 2 is composed of a multiplicity of the blades 1 shown in FIG. 1, three of the blades being designated 1, 1 'or 1 "for better explanation.

The blades 1, 1 ', 1' 'are arranged in the circumferential direction U about the central axis M. The central axis M coincides with the intersection between the main directions of extension H, H ', H' 'of the blades 1, 1' and 1 '' together. The central axis M corresponds to the central axis of the rotor, not shown, after installation of the blade ring segment 2 in a turbine 17, which is indicated only schematically in FIG. 2. In order to form the blade ring segment 2, the

Blades 1, 1 ', 1''positively connected to each other. This happens because, as explained below for the show ^¬ blades 1 and 1 ', the positive contour 12 of the blade. 1 with the negative contour 7 'of the blade 1' and the positive contour 16 of the blade 1 with the negative contour 14 'of the blade 1' is brought into engagement. This happens because the blade 1 is moved radially inward in the illustrated arrow direction.

Thus constructed of a multi ^¬ number of blades 1, 1 ', 1''simply the blade ring segment 2 and then ge be ^¬ handles.

Thereafter, in a further step, the blades 1, 1 ', 1''together by means of welds 21, 21' firmly connected. The welds 21, 21 'connect two heads 3, 3' and 3 ', 3''with each other. In addition, the feet 4, 4 ', 4''of the blades 1, 1', 1 '' can also be connected by means of welds 22, 22 '. The welds 21, 21 ', 22, 22' provide a permanent connection between the blades 1, 1 ', 1''. However, it is also conceivable instead of the welds provide other material fit or form-fit or force-fit Verbin ^¬ applications.

The Schaufelkranz- is then segment 2 in a third step, which can form (180 ° or 360 ° =) also comprises a half or full circle, set a ^¬ in a holding device 23, for example a groove in a housing 24 of the turbine 17 , Fig. 3 shows an exploded view of a Schaufelkranzseg ^¬ element 2 'in accordance with another embodiment of the constricting vorlie ^¬ invention.

The embodiment according to FIG. 3 differs from that according to FIGS. 1 and 2 only in that a different type of connection between the blades 1, 1 ', 1''is provided, as described below with reference to the blades 1, 1' ^¬ her explained. The heads 3, 3 'as well as the feet 4, 4' of the blades 1, 1 'have on their opposite sides 6', 11 'and 13', 15 'in each case a negative contour 25' or 26 '.

In two opposing negative contours 25, 26 'of the blade 1, 1', a connecting element is inserted 27, which 'form-fitting buildin ^¬ Untitled the heads 3 and 3 to each other. The connecting element 27 is pushed radially from the outside inwards into the negative recesses 25, 26 '.

Accordingly, the positive fastening of the feet 4, 4 'to each other by means of a connecting element 28th

According to the exemplary embodiment according to FIG. 3, the connecting element 27, 28 is composed of two opposite dovetails 31, 32.

Alternatively, the connecting element 27, 28 may also be formed as shown in FIG. 4. Accordingly, the connecting element 27 has a cross section which is composed of two successive (imaginary) circles 33, 34.

According to a further embodiment, the connecting element 27, 28 is H-shaped, as shown in Fig. 5.

It is also possible to form the connecting elements 27, 28 of a different material than the blades 1, 1 ', 1' '. For example, the connecting elements 27, 28 may be formed of a damping material to dampen vibrations between the blades 1, 1 ', 1' '.

Fig. 6 the blade ring segment 2 'of Fig. 3 shows in together ^¬ quantitative translated and welded state.

In particular, in Fig. 6 can be seen that the 'connection elements used 27 with the radially outer sides 8, 8' in the Nega ^¬ tivkonturen 25, 26 of the heads 3, 3 'bün- conclude dig. The same applies to the feet 4, 4 'connecting connecting elements 28th

Although the invention has been described in terms of preferred embodiments, it is by no means limited to this, but in many ways modifiable It should be noted that the embodiments and embodiments of the invention ^shown SEN blade ring segment described above, according to the invention to the erfindungsge ^¬ Permitted flow machine and to the Procedures are applicable, and vice versa. It should also be mentioned that "a" does not preclude a large number in the present case.

Claims

claims

1. blade ring segment (2, 2 ') for a turbomachine (17), in particular a turbine, comprising:

- A first blade (1), and

a second blade (1 '),

- Wherein the first blade (1) with the second blade (1 ') is positively connected.

2. blade ring segment according to claim 1,

wherein the first blade (1) 'is a negative contour (7) has a positive contour (12) and the second blade (1)' on ^¬ into which positively engages the positive profile (12).

3. blade ring segment according to claim 2,

wherein the positive contour (12) and negative contour (7 ') are formed such that the positive connection by means of a radial (H) relative movement between the first and second blades (1, 1') can be produced.

4. blade ring segment according to one of the preceding claims,

wherein the first blade (1) has a first head (3) and a first leg (4) and the second blade (1 ') has a second head (3') and a second leg (4 '), the first head (3) 3) with the second head (3 ') and / or the first foot (4) with the second foot (4') is positively connected.

5. blade ring segment according to claim 2 or 3 and 4,

wherein the negative contour (7 ', 14') radially on the outside of the second head (3 ') and / or second foot (4') and the positive Kontor (12, 16) radially outward on the first head (3) and / or first Foot (4) is formed, wherein preferably also the negative contour (7 ', 14') radially (H) open for engagement of the positive contour (12, 16) is formed.

6. blade ring segment of any one of the preceding claims, wherein a connecting element (27, 28) is provided, which engages on the one hand in the first blade (1) and on the other ^¬ in the second blade (1 ') a form-fitting ^¬ , in order to connect them in that the connecting element (27, 28) is preferably in the first and second head (3, 3 ') and / or in the first and second foot (4,

4 ') engages.

7. blade ring segment according to claim 6,

wherein the connecting element (27, 28) is dovetail-shaped or H-shaped or has a cross-section which is composed of two adjacent / juxtaposed circles (33, 34).

8. vane ring segment according to one of the preceding claims,

wherein a material connection (21, 21 ', 22, 22') is further provided which connects the first blade (1) with the second blade (1 ').

9. turbomachine (17), in particular turbine, with a blade ring segment (2, 2 ') according to one of the preceding claims.

10. A method for producing a blade ring segment (2, 2 '), in particular a blade ring segment (2, 2') according to one of claims 1 to 8, and / or a Strömungsma ^¬ machine (17) according to claim 9, wherein a first and a second blade (1, 1 ') with each other form-locking verbun ^¬ the.