SEALING WASHER FOR A ROTOR, AND ROTOR WITH SUCH A WASHER

Abstract

A sealing washer for use in a rotor of a gas turbine, sealing being brought about on one side of the sealing washer by an approximately radially oriented bearing face and on the other side by way of a supporting face which is oriented in an inclined manner with respect to the rotor axis. The sealing washer is of split configuration and has at least one washer segment with a circumferential washer section. At the dividing point, a pressing section and a triangular section overlap along a dividing face. Here, the dividing face intersects the bearing face and makes sealing both with the pressing section and with the triangular section possible. In order to also make sealing on the supporting face with the pressing section and the triangular section possible, the triangular section is reduced to at most 0.3 times the cross-sectional area of the washer section.

Claims

1. A sealing washer for use in a rotor, in particular of a gas turbine, the rotor comprising a bearing face which has an angle with respect to a radial direction of at most 15° and is delimited by an outer bearing edge and an inner bearing edge, and a supporting face which has an angle with respect to the rotor axis of at least 15° and at most 45° and is delimited by a front supporting edge and a rear supporting edge, the sealing washer comprising: a washer section which extends in the circumferential direction, and a pressing section which adjoins a first section end of the washer section in one piece in the circumferential direction and forms a gap with respect to a second section end of the washer section or another washer section, and a triangular section which adjoins the second section end in one piece in the circumferential direction and forms a gap with respect to the first section end and overlaps the pressing section along a dividing face, a lower dividing face edge of the dividing face being arranged between the center of the bearing face and the inner bearing edge, wherein the cross-sectional area of the triangular section corresponds to at most 0.3 times the cross-sectional area of the washer section and an upper dividing face edge of the dividing face is arranged between the center of the supporting face and the rear supporting edge.

2. The sealing washer as claimed in claim 1, comprising: a sealing washer width in the axial direction and a sealing washer height in the radial direction, wherein the bearing face having a bearing height of at least 0.5 times the sealing washer height, and/or wherein the supporting face having a supporting width of at least 0.5 times the sealing washer width.

3. The sealing washer as claimed in claim 1, wherein the spacing of the lower dividing face edge being smaller from the inner bearing edge than from the center of the bearing face; and/or wherein the spacing of the upper dividing face edge being smaller from the rear supporting edge than from the center of the supporting face.

4. The sealing washer as claimed in claim 1, wherein an angle between the dividing face and the radial direction as well as between the dividing face and the rotor axis is between 35° and 55°.

5. The sealing washer as claimed in claim 1, wherein the sealing washer is formed from at least two washer segments which are formed in each case by a washer section and on both sides in each case by a pressing section or a triangular section.

6. The sealing washer as claimed in claim 5, further comprising: a closing washer segment having a triangular section on both sides.

7. The sealing washer as claimed in claim 6, wherein the washer section of the closing washer segment extends over at most 20°.

8. The sealing washer as claimed in claim 5, at least two of the washer segments being formed by identical parts.

9. The sealing washer as claimed in claim 1, wherein the spacing of the outer bearing edge from the front supporting edge corresponding to at most 0.2 times the sealing washer width.

10. The sealing washer as claimed in claim 1, wherein the sealing washer has, in cross section in a manner which lies opposite the bearing face and is adjacent to the supporting face, an arcuate section.

11. A rotor, comprising: a rotor disk which, distributed over the circumference, has a plurality of blade holding grooves, and a plurality of rotor blades which are fastened in each case by way of a blade holding root in a blade holding groove, and a plurality of sealing elements which are arranged in front of an end side of the rotor disk and an end side of the blade holding roots, a sealing washer being arranged between the end side and the sealing elements, wherein the configuration of the sealing washer is as claimed in claim 1.

12. The rotor as claimed in claim 11, wherein the closing washer segment is wider than a blade holding root and extending over an angle which is smaller than twice the separation of the blade holding grooves.

13. The sealing washer as claimed in claim 1, wherein the rotor is a rotor of a gas turbine.

14. The sealing washer as claimed in claim 4, wherein the angle between the dividing face and the radial direction as well as between the dividing face and the rotor axis being between 40° and 50°.

15. The sealing washer as claimed in claim 9, wherein the outer bearing edge and the front supporting edge are connected to one another via a rounded portion and/or flattened portion.

16. The sealing washer as claimed in claim 10, wherein the sealing washer has a straight section between the arcuate section and the bearing face on the side which points toward the rotor axis.

17. The rotor as claimed in claim 11, wherein the rotor is a rotor of a gas turbine.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0033] One exemplary embodiment for a sealing washer according to the invention is outlined in the following figures, in which:

[0034] FIG. 1 shows one exemplary embodiment for a sealing washer according to the invention consisting of three washer segments;

[0035] FIG. 2 shows a closing washer segment in the arrangement on a rotor disk;

[0036] FIG. 3 shows a detailed view of the closing washer segment;

[0037] FIG. 4 shows the overlapping region with a view of the bearing face;

[0038] FIG. 5 shows the overlapping region with a view of the supporting face;

[0039] FIG. 6 shows a section through the overlapping region;

[0040] FIG. 7 shows the closing washer segment in a perspective view;

[0041] FIG. 8 shows a view of the second section end;

[0042] FIG. 9 shows a perspective view of the pressing section.

DETAILED DESCRIPTION OF INVENTION

[0043] FIG. 1 shows a perspective view of one exemplary embodiment of a sealing washer 01. In said exemplary embodiment, the sealing washer 01 consists of three washer segments 03, 04, 05, two washer segments 03 and 04 being configured as identical parts and extending over an angle of a little more than 170°. Furthermore, there is a closing washer segment 05 which 05 extends over an angular range of approximately 15°; see also FIG. 7.

[0044] As can be seen to some extent from FIG. 2, the sealing washer 01 is received in a groove on a rotor disk 17. Here, said rotor disk 17 has a plurality of blade holding grooves 18 in a manner which is distributed over the circumference, in which blade holding grooves 18 rotor blades 19 are in each case fastened by way of a blade root. The closing washer segment 05 is arranged in front of a blade holding groove 18 and therefore in front of the blade root of the rotor blade 19. The overlapping region which is present on both sides with respect to the adjacent washer segments 03, 04 is arranged in a region in front of the rotor disk 17 between the blade holding grooves 18.

[0045] FIG. 3 outlines a detail of the sealing washer from FIG. 1 in the region of the closing washer segment 05. The washer segments 03, 04 and 05 in each case have a washer section 07 which extends in sections in the circumferential direction and has a constant cross section. The respective overlapping region is situated on both sides at the ends of the washer sections 07, either a pressing section 11 or a triangular section 13 being arranged at the respective end. There is in each case a gap 15 in the overlapping region between the adjacent washer segments 03, 04 and 05.

[0046] In respect of the precise embodiment of the sealing washer 01, reference is made, in particular, to FIGS. 4, 5 and 6. The sealing washer 01 first of all has a bearing face 21 on the side which points away from the rotor disk 17. Said bearing face 21 extends in the radial direction in said exemplary embodiment and is delimited by way of an inner bearing edge 23 on the side which points toward the rotor axis and by way of an outer bearing edge 22 on the side which points radially to the outside. In said exemplary embodiment, sealing elements 09 come to bear against the bearing face 21.

[0047] Furthermore, the sealing washer 01 has an inclined supporting face 24 on the side which points radially to the outside and toward the rotor disk 17. Said supporting face 24 is inclined at an angle of approximately 40° with respect to the rotor axis. Here, the supporting face 24 is delimited by a front supporting edge 25 on the side which points radially to the outside, said supporting edge 25 likewise being situated on the sealing washer 01 on the side which points toward the bearing face 21. In a manner which lies opposite, the supporting face 24 is delimited by way of the rear supporting edge 26 which 26 is arranged at that end of the supporting face 24 which points toward the rotor axis and points away from the bearing face 21.

[0048] Furthermore, it can be seen from the sectional illustration in FIG. 6 that the supporting face 24 is connected to the bearing face 21 via a flattened portion 31 on the side which points radially outward. In a manner which lies opposite the bearing face 21 and adjacently with respect to the supporting face 24, the sealing washer 01 has an arcuate section 32. Said arcuate section 32 merges into a straight section 33 on that side of the sealing washer 01 which points toward the rotor axis.

[0049] In the radial direction, the sealing washer 01 has a sealing washer height, measured from the straight section 33 as far as the flattened portion 31. In the direction of the rotor axis, a sealing washer width is determined from the bearing face 21 as far as the opposite end. As can be seen, a width of the bearing face 21 from the inner bearing edge 23 as far as the outer bearing edge 22 is greater than 0.9 times the sealing washer height. In contrast, a width of the supporting face 24 measured in the direction of the rotor axis from the front supporting edge 25 as far as the rear supporting edge 26 corresponds approximately to 0.6 times the sealing washer width.

[0050] The overlapping region between two washer segments 03, 04 and 05 is formed in each case by way of a triangular section 13 and a pressing section 11 which bear against one another; see, in particular, FIGS. 4 and 5. Here, the triangular section 13 adjoins a second section end 14 of the corresponding washer section 07 in the circumferential direction; in this regard, see also FIG. 8. In contrast, the pressing section 11 adjoins the adjacent washer section 07 at its first section end 12 in the circumferential direction; in this regard, see FIG. 9. Here, the corresponding gap 15 is formed firstly between the free end of the triangular section 13 and the adjacent first section end 12 and between the free end of the pressing section 11 and the adjacent second section end 14.

[0051] Here, the triangular section 13 bears against the pressing section 11 along a dividing face 27. Here, the dividing face 27 extends from a lower dividing face edge 28 as far as an upper dividing face edge 29. As can be seen, in particular, from FIG. 4, the lower dividing face edge 28 intersects in sections the bearing face 21 between the first section end 12 and the second section end 14. It is therefore clear that both the triangular section 13 and the pressing section 11 have the bearing face 21 in sections.

[0052] Contrary to the customary embodiments, it is provided according to the invention that the dividing face 27 extends in an inclined manner with respect to the supporting face 24. This leads to the upper dividing face edge 29 intersecting the supporting face 24 in sections. Therefore, both of the triangular section 13 and the pressing section 11 have the supporting face 24 in sections. In said exemplary embodiment, the dividing face 27 is arranged diagonally and has an angle here of 45° with respect to the rotor axis and therefore 45° with respect to the radial direction. In this context, it is to be expressly noted that it is also permissible within the context of the invention if the lower dividing face edge 29 is situated directly at the rear supporting edge 26 and therefore merely a minimum strip of the supporting face 24 remains on the pressing section 11.