EP2084369B1 - Guiding device of a flow machine and guide vane for such a guiding device - Google Patents

Abstract

A guide device for a turbomachine, particularly a steam turbine, with a guide vane ring and a plurality of guide vanes which are fastened to the guide vane ring so as to be distributed along the circumference of the guide vane ring. The guide vane ring has a groove, and the guide vanes also have grooves which are aligned with the groove of the guide vane ring in the assembled state. The guide vanes are fixed in their radial position at the guide vane ring by means of a retaining ring which engages in the groove of the guide vane ring and in the grooves of the guide vanes.

Description

The invention relates to a guide device of a turbomachine according to the preamble of claim 1. Furthermore, the invention relates to a method for producing a guide device of a turbomachine and a guide vane for such a guide device.

From the DE 195 47 653 C2 is a guide device for a turbomachine, in particular for a steam turbine, known, wherein the guide device disclosed therein comprises a vane ring, and wherein seen over the circumference of the vane ring distributed more vanes are attached to the same. The vane ring is attached to a vane carrier along with the vanes attached to the vane ring.

After DE 195 47 653 C2 As seen in the closest prior art, the vanes are attached to the vane ring such that a through hole is provided for each vane to fix vane roots of the vanes in the vane ring which penetrates the vane ring and vane root and to the side, in the axial direction extending insertion of a blade retaining pin is suitable. Such a fixation of the vanes on the vane ring requires a high production cost and is also expensive to install.

On this basis, the present invention is based on the problem to sheep a simpler Leitvorrichtung a turbomachine. This problem is solved by a guide device of a turbomachine according to claim 1.

According to the invention, the guide vane ring has a groove, wherein the guide vanes also have a groove, which are aligned in the mounted state with the groove of the vane ring, and wherein the guide vanes are fixed in their radial position on the vane ring via a retaining ring, which in the groove of the vane ring and in engages the groove of the vanes.

Due to the fact that, in the case of the guide device according to the invention, the radial attachment of the guide vanes to the guide blade ring takes place by means of a retaining ring which engages in a groove of the guide blade ring and in corresponding grooves of the guide vanes, resulting in reduced manufacturing outlay and reduced assembly costs. Furthermore, the replacement of guide vanes in carrying out repair work or maintenance on the guide device according to the invention is simplified.

A method for producing the guide device of the turbomachine is defined in claims 10 and 11. The guide vane according to the invention for a guide device of a turbomachine is defined in claim 12.

Fig. 1:

einen Ausschnitt aus einer erfindungsgemäßen Leitvorrichtung einer Strömungsmaschine;

Fig. 2:

einen Querschnitt durch die Leitvorrichtung entlang der Schnittrichtung A-A in Fig. 1;

Fig. 3:

einen Ausschnitt aus einem Leitschaufelring der erfindungsgemäßen Leitvorrichtung in perspektivischer Ansicht;

Fig. 4:

einen Querschnitt durch den Leitschaufelring der Fig. 3 in einer Schnittrichtung analog zur Schnittrichtung A-A der Fig. 1;

Fig. 5:

eine Leitschaufel der erfindungsgemäßen Leitvorrichtung in perspekti- vischer Ansicht;

Fig. 6:

die Leitschaufel der Fig. 5 in Seitenansicht;

Fig. 7:

einen Ausschnitt aus einer erfindungsgemäßen Leitvorrichtung; und

Fig. 8:

einen Querschnitt durch die Anordnung der Fig. 7 entlang der Schnitt- richtung B-B in Fig. 7.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. An embodiment of the invention will be described, without being limited thereto, with reference to the drawing. Showing:

Fig. 1:

a section of a guide device according to the invention a turbomachine;

Fig. 2:

a cross section through the guide device along the cutting direction AA in Fig. 1 ;

3:

a detail of a guide ring of the guide device according to the invention in a perspective view;

4:

a cross section through the vane ring of Fig. 3 in a cutting direction analogous to the cutting direction AA of Fig. 1 ;

Fig. 5:

a guide vane of the guide device according to the invention in perspekti- vischer view;

Fig. 6:

the vane of the Fig. 5 in side view;

Fig. 7:

a section of a guide device according to the invention; and

Fig. 8:

a cross section through the arrangement of Fig. 7 along the cutting direction BB in Fig. 7 ,

Fig. 1 shows a section of a guide device according to the invention of a turbomachine in the region of a stator blade ring 10 and a plurality of guide vanes 11 attached to the guide blade ring 10. 3 and 4 show the guide blade ring 10 in each case alone, FIGS. 5 and 6 also show a guide vane 11 in isolation.

The vane ring 10 is preferably made split and composed of two halves. According to Fig. 1 the vanes 11 are fixed to the vane ring 10 in the circumferential direction of the same viewed from each other, wherein for mounting the vanes 11 on the vane ring 10, the vanes in recesses 12 (see Fig. 3 ) of the vane ring 10 are insertable. The recesses 12 of the vane ring 10 extend in the radial direction, so that for the assembly of the vanes 11 on the vane ring 10, the vanes 11 are introduced from radially outside to radially inside or vice versa from radially inside to radially outside into the recesses 12 of the vane ring 10.

For radial fixation of the guide vanes 11 on the guide vane ring 10, a circumferential groove 13 in the same circumferential groove is inserted into one side of the guide vane ring 10 in the same. Likewise, a groove 14 is introduced into each vane 11 on one side thereof.

The groove 14 of each vane 11 is arcuate, in particular circular arc, formed and introduced into a radially outer end thereof. Likewise, the groove 13 of the vane ring 10 is arcuate, in particular circular arc, formed.

A radially inner boundary surface and a radially outer boundary surface of the groove 13, 14 of the guide blade ring 10 and vanes 11 preferably have a distance of between 3 mm and 9 mm, in particular between 4 mm and 8 mm. The radially inner boundary surface and the radially outer boundary surface of the groove 13, 14 are either flat or designed as cutouts a cylindrical or conical or toroidal surface.

In the assembled state of the vanes 11 on the vane ring 10, the grooves 14 of the vanes 11 are aligned with the groove 13 of the vane ring 10. For radial fixation of the vanes 11 on the vane ring 10 is a retaining ring 15, which, as best Fig. 2 can be removed, engages in the groove 13 of the guide vane ring 10 and in the groove 14 of the vanes 11. Accordingly, the guide vanes 11 can be fixed in their radial position on the guide vane ring 10 via the retaining ring 15.

The radial extension of the retaining ring 15 is adapted to the distance between the radially inner boundary surface and the radially outer boundary surface of the groove 13, 14. Likewise, the contour of radial boundary surfaces of the retaining ring 15 is adapted to the contour of the radially inner boundary surface and the radially outer boundary surface of the groove 13, 14, so that the radial boundary surfaces of the retaining ring 15 as low as possible and full surface of the radial boundary surfaces of the groove 13, 14th nestle.

As well as best Fig. 2 can be removed, engage the vanes 11 with radially inner ends of the same associated projections 16 in recesses of a Innenendeckbands 17 of the guide, but such an inner shroud 17 is purely optional. The guide device according to the invention can also be designed without inner cover tape, wherein then the guide vanes at the radially inner ends of the same are assigned no projections.

The vane ring 10 is together with the stator vanes 10 fixed vanes 11 according to Fig. 7 and 8th attachable to a vane support 18, according to Fig. 7 and 8th via at least one screw 19. According to Fig. 8 engages the screw 19 with a screw shaft 20 exclusively in the guide blade carrier 18, the screw 19 but covers with its screw head 21 in sections, both the blade carrier 18 and the blade ring 10 and the retaining ring 15 (see Fig. 7 ).

On the one hand, the guide vane ring 10 on the guide vane support 18 is on the one hand via the screw 19, further serves the screw 19 of the circular fixing of the retaining ring 15 in the vane ring 10. As already stated, one or more such screws 19 distributed over the circumference of the guide 10 be arranged.

Alternatively, the attachment of the vane ring to the vane carrier and the attachment of the retaining ring to the vane ring by a held by at least one screw in the vane carrier feather or disk done, which covers the three modules together.

The manufacture or assembly of a guide device according to the invention can take place in that in the guide vane ring 10, the groove 13 and the guide vanes 11, the groove 14 before assembly of the guide vanes 11 on the guide vane ring 10 and are therefore introduced separately.

The introduction of the groove 13 in the guide vane ring 10 is preferably carried out by turning or milling and the introduction of the groove 14 in the guide vanes 11 is preferably carried out by milling or bumping. Thereafter, the vanes 11 may be secured to the vane ring 10 via the recesses 12 to, when the grooves 14 of the vanes 11 are aligned with the groove 13 of the vane ring 10, insert the retaining ring 15 in the axial direction in the groove 13, 14.

Alternatively, the production or assembly of the guide device according to the invention can also be such that no-key vanes 11 are introduced into a grooveless guide vane ring 10 via the recesses 12, and then by turning or milling the groove 13, 14 together in the guide vane ring 10 and the vanes 11 are introduced.

The guide device according to the invention is characterized by a relatively low production cost and installation effort. Furthermore, it is relatively easy to replace guide vanes on the guide device according to the invention.

LIST OF REFERENCE NUMBERS

10

vane ring

11

vane

12

recess

13

groove

14

groove

15

retaining ring

16

head Start

17

Inner shroud

18

guide vane

19

screw

20

screw shaft

21

screw head

Claims (15)

1. A guiding device of a flow machine, in particular of a steam turbine, having a guide vane ring and a plurality of guide vanes which are pounced on the guide vane ring and are arranged distributed over the circumference of the guide vane ring, characterised in that the guide vane ring (10) has a groove (13), in that the guide vanes (11) have grooves (14) which, in the assembled condition, are aligned with the groove (13) of the guide vane ring (10), and in that the guide vanes (11) are fixed in their radial position on the guide vane ring (10) by way of a retaining ring (15) which engages in the groove (13) of the guide vane ring (10) and in the grooves (14) of the guide vanes (11).
2. A guiding device according to Claim 1, characterised in that the groove (13) of the guide vane ring (10) is incorporated in the guide vane ring on one side thereof, in that the grooves (14) of the guide vanes (11) are incorporated in the guide vanes on one side thereof, and in that, on this side, the retaining ring (15) is incorporated, in the axial direction in the groove (13) of the guide vane ring (10) and in the grooves (14) of the guide vanes (11).
3. A guiding device according to Claim 1 or 2, characterised in that the guide vane ring (10), together with the guide vanes (11) fixed in their radial position on the guide vane ring (10), is mounted on a guide vane carrier (18).
4. A guiding device according to Claim 3, characterised in that the guide vane ring (10), together with the guide vanes (11) fixed to the guide vane ring (10), can be mounted on the guide vane carrier (18) by way of at least one screw (19).
5. A guiding device according to Claim 4, characterised in that the, or each, screw (19) engages exclusively in the guide vane carrier (18) by cleans of a screw shaft: (20), and covers portions of the guide vane carrier (18) and the guide vane ring (10) and the retaining ring (15) with a screw head (21)
6. A guiding device recording to one or more of Claims 1 to 5, characterised in that the groove (13) of the guide vane ring (10) and the grooves (14) of the guide vanes (11) have an arcuate, in particular a circular arcuate, course.
7. A guiding device according to one or more of Claims 1 to 6, characterised in that a radially inner delimiting face and a radially outer delimiting face of the grooves (13, 14) are at a spacing of between 3 mm and 9 mm, in particular between 4 mm and 3 mm.
8. A guiding device according to one of more of Claims 1 to 7, characterized in that a radially inner delimiting face and a radially outer delimiting face of the grooves (13, 14) are of a planar construction.
9. A guiding device according to one or morse of Claims 1 to 7, characterised in that a radially inner delimiting face and s radially outer delimiting face of the grooves (13, 14) are constructed as sections of a cylindrical, or conical or toroidal face.
10. A process for the manufacture of a guiding device according to one or more of Claims 1 to 9, characterised in that the groove (13) is incorporated in the guide vane ring (10) by turning or milling, and the grooves (14) of the guide vanes (11) are incorporated by punching or milling before assembly of the guide vanes (11) on the guide vane ring (10).
11. A process for the manufacture of a guiding device according to once or more of Claims 1 to 9, characterised in that the groove (13) in the quids vane ring (10) and the grooves (14) of the guide vanes (11) are incorporated the vane ring (10) and the guide vanes (11) together by turning or milling after assembly of the guide vanes (11) on the guide vane ring (10).
12. A guide vane of a guiding device according to one or more of claims 1 to 9, characterised in that a groove (14) extending in the form of an are, in particular a circular are, is incorporated in a radially outer end of the guide vane.
13. A guide vane according to Claim 12, characterised in that a radially inner delimiting face of the groove (14) and a radially outer delimiting face of the groove (14) are at a spacing of between 3 mm and 9 mm, in particular between 4 mm and 8 mm.
14. A guide vane according to Claim 12 or 13, characterised in that is radially inner delimiting face of the groove (14) and a radially outer delimiting face of the groove (14) are of a plantar construction.
15. A guide vane according to Claim 12 or 13, characterised in that a radially inner delimiting face of the groove (14) and a radially outer delimiting face of the groove (14) are constructed as sections of a cylindrical or conical or toroidal face.

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