ROTOR DISK HAVING AN END-SIDE SEALING ELEMENT

Abstract

A rotor disk arrangement having a rotor disk which has, distributed around the outer circumference, a plurality of axially extending blade holding grooves and an encircling fastening protrusion and/or a plurality of fastening protrusions arranged in a circumferentially distributed manner, and having a plurality of sealing elements arranged in a circumferentially distributed manner, the sealing elements covering the blade holding grooves at least in portions on the end side and having, on the side facing the rotor axis, at least one fastening portion that bears against the underside of the fastening protrusion, wherein the fastening protrusion is embodied in an undercut manner, wherein the distance thereof from the rotor axis at the free end facing away from the rotor disk is less than in a region within the fastening protrusion.

Claims

1. A rotor disk arrangement having a rotor disk which has, distributed around the outer circumference, a plurality of axially extending blade holding grooves and an encircling fastening protrusion and/or a plurality of fastening protrusions arranged in a circumferentially distributed manner, and having a plurality of sealing elements arranged in a circumferentially distributed manner, said sealing elements covering the blade holding grooves at least in portions on the end side and having, on the side facing the rotor axis, at least one fastening portion that bears against the underside of the fastening protrusion, wherein the fastening protrusion is embodied in an undercut manner, wherein the distance thereof from the rotor axis at the free end facing away from the rotor disk is less than in a region within the fastening protrusion.

2. The rotor disk arrangement as claimed in claim 1, wherein all of the sealing elements together form a substantially closed rotary body and/or completely cover the blade holding grooves on the end side.

3. The rotor disk arrangement as claimed in claim 1, further comprising a bearing surface, facing the rotor axis, of the fastening protrusion that is embodied in a planar manner and/or as a portion of a conical surface, the distance of said bearing surface from the rotor axis decreasing continuously toward the free end, wherein the fastening protrusion has a constant thickness or a thickness that decreases toward the free end, perpendicularly to the bearing surface.

4. The rotor disk arrangement as claimed in claim 1, wherein the free end of the fastening protrusion is formed by a securing web extending to the rotor axis, said securing web axially bounding a radially inwardly opening bearing groove in the fastening protrusion.

5. The rotor disk arrangement as claimed in claim 1, wherein the fastening portion on the sealing element extends axially in a manner facing the rotor disk, and in the circumferential direction across the entire width of the sealing element.

6. The rotor disk arrangement as claimed in claim 1, further comprising a fastening receptacle that is recessed axially into the sealing element or passes through the sealing element and is spaced apart from side peripheries of the sealing element that is arranged radially above the fastening portion.

7. The rotor disk arrangement as claimed in claim 1, wherein the rotor disk has at least two undercut radial depressions that are arranged in a circumferentially distributed manner in each case between blade holding grooves, and at least two sealing elements each have at least one elevation that engages in the depression.

8. The rotor disk arrangement as claimed in claim 7, wherein the depression is arranged in front of the end face in a manner opening toward the rotor axis, and in particular extends radially with respect to the rotor axis.

9. The rotor disk arrangement as claimed in claim 7, wherein the fastening receptacle forms a free space radially above the fastening protrusion, said free space allowing a removal movement, at least toward the rotor axis, of the elevation out of the depression.

10. The rotor disk arrangement as claimed in claim 9, wherein the free space is covered by a securing plate.

11. The rotor disk arrangement as claimed in claim 10, wherein the securing plate is secured with a peripheral portion in a radially extending plate groove in the fastening protrusion and/or is secured axially in the sealing element and radially in the direction of the bottom of the plate groove, wherein the opposite peripheral portion bears radially against an axially extending securing protrusion.

12. The rotor disk arrangement as claimed in claim 1, further comprising a securing element that passes through the sealing element at least in portions and engages in a cutout in the rotor disk, radially beneath the fastening protrusion.

13. The rotor disk arrangement as claimed in claim 1, further comprising a blocking element that is arranged on at least one rotor blade, said blocking element extending axially beyond the end side and engaging in a cutout, facing the end side, in the sealing element.

14. The rotor disk arrangement as claimed in claim 1, wherein the sealing element has a substantially flat sealing portion facing the rotor axis, and a radially outwardly facing wing portion which is embodied in a radially outwardly opening U-shaped or V-shaped manner in a cross section along the rotor axis.

15. The rotor disk arrangement as claimed in claim 1, further comprising a first sealing element that has, on at least one first side periphery, or on the first side peripheries that are opposite one another in the circumferential direction, a sealing tab, facing the end side, with a constant material thickness, and a second adjacent sealing element that has, on a second side periphery, or on the second side peripheries that are opposite one another in the circumferential direction, a sealing shoulder in which the sealing tab engages.

16. The rotor disk arrangement as claimed in claim 1, further comprising at least one sealing element that has side peripheries that are opposite one another in the circumferential direction and extend parallel to one another.

17. A rotor having a rotor disk arrangement as claimed in claim 1.

18. A gas turbine having a rotor as claimed in claim 17.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Exemplary embodiments of an arrangement according to the invention of sealing elements on a rotor disk are depicted in the following figures, in which:

[0031] FIG. 1 shows, in a detail, a perspective view of a rotor disk arrangement with hooked-in sealing elements;

[0032] FIG. 2 shows a view analogous to FIG. 1, with the omission of a sealing element;

[0033] FIG. 3 shows a longitudinal section of the arrangement from FIG. 1;

[0034] FIG. 4 shows an exploded view of FIG. 3;

[0035] FIG. 5 and FIG. 6 each show perspective views of the embodiment from FIG. 1;

[0036] FIG. 7 shows a securing plate of the embodiment from FIG. 1;

[0037] FIG. 8 shows a further exemplary embodiment of a hooked-in sealing element in the longitudinal section analogous to FIG. 3;

[0038] FIG. 9 shows an exploded view of FIG. 8;

[0039] FIG. 10 and FIG. 11 show a further exemplary embodiment of a hooked-in sealing element.

DETAILED DESCRIPTION OF INVENTION

[0040] FIG. 1 depicts, in a detail, a perspective view of an exemplary embodiment of a rotor disk arrangement according to the invention. Said rotor disk arrangement comprises a rotor disk 01 and a multiplicity of sealing elements 11 fastened to the rotor disk 01. In the subsequent FIG. 2, in the same view as FIG. 1, the rotor disk arrangement is depicted without a sealing element 11a. It is possible to see the arrangement of the multiplicity of sealing elements 11a, 11b adjacent to one another so as to form a substantially closed ring. Here, the sealing elements 11 are situated in front of an end side 02 of the rotor disk 01 and cover, on the end side, rotor blade grooves 09 provided in the rotor disk 01. It emerges in an obvious manner that the blade holding grooves 09, of which there is a multiplicity, are likewise arranged in a circumferentially distributed manner.

[0041] For the fastening of the sealing elements 11, the rotor disk 01 has in each case a fastening protrusion 03, which 03 extends substantially axially from the end side 02. To each fastening protrusion 03 there is fastened in each case one sealing element 11. It can be seen in particular from the figure that the fastening protrusions 03 project beyond the sealing elements 11 by way of a free end 04 which is spaced apart from the end side 02. It is also possible to see the arrangement of securing plates 19 between the fastening protrusion 03 of the rotor disk 01 and the respective elevations 18 on the individual sealing elements 11.

[0042] Furthermore, it can be seen from FIG. 2 in particular that two different sealing elements 11a and 11b are used in each case alternately, wherein the sealing element 11b has, on the side facing toward the end side 02, a sealing tab 27 which protrudes in a circumferential direction. For this purpose, the adjacent sealing element 11a has, on the side facing toward the end side 02 of the rotor disk 01, a sealing shoulder 28 in which 28 the sealing tab 27 engages. In this way, advantageous coverage of a joint between the individual sealing elements 11a, 11b is realized.

[0043] The fastening of the sealing elements 11 to the rotor disk 01 can advantageously be seen in a longitudinal section in FIGS. 3 and 4. The rotor disk 01 has the axially extending fastening protrusion 03. Here, the fastening protrusion 03 extends with a bearing surface 05, facing the rotor axis, to a free end 04 which is spaced apart from the end side 02, wherein the distance of the bearing surface 05 from the end side 02 becomes progressively smaller toward the free end 04. Furthermore, the fastening protrusion 03 has, opposite the bearing surface 05 on the radially outwardly directed side, a plate groove 08 which 08 serves for receiving the securing plate 19. From the views, it can also be seen that the fastening protrusion 03 is advantageously situated beneath the rotor blade groove 09 and is thus attached in a stable manner to the rotor disk 01. Spaced apart from the fastening protrusion 03, facing radially away from the rotor axis and above the fastening protrusion 03, there is situated in each case one depression 07 in the form of a receiving groove facing the rotor axis. Here, the depression 07 is likewise arranged in front of the end side 02 and is situated in each case between two blade holding grooves 09.

[0044] The sealing element 11 hooked onto the rotor disk 01 has, for the transmission of the centrifugal forces, a fastening portion 13 on the side facing the rotor axis, which 13 extends between the two side peripheries 26 of the sealing element 11. Above the fastening portion 13 there is situated a fastening receptacle 14 which extends through the sealing element 11. As a result of the joining of the sealing element 11 to the rotor disk 01, the fastening protrusion 03 of the rotor disk 01 protrudes into the fastening receptacle 14, wherein the bearing surface 05 of the fastening protrusion 03 comes to bear against the fastening portion 13. As a result of the particularly advantageous design of the fastening protrusion 03 with a downwardly sloping bearing surface 05, the centrifugal force arising in the sealing element 11 during rotation of the rotor disk arrangement causes the sealing element 11 to be pulled onto the end side 02 of the rotor disk 01.

[0045] For the axial securing action, the sealing element 11 furthermore has, complementary to the depression 07 of the rotor disk 01, an elevation 17 in the form of a web extending in a circumferential direction. Said radially outwardly extending elevation 17 engages into the depression 07 and thus secures the position of the sealing plate 11 in the axial direction in the outer region.

[0046] It can also be seen that the sealing element 11 has a lower sealing portion 21, which faces the rotor axis, and a wing portion 22 situated radially to the outside. Here, the sealing portion 21 is of substantially flat form, that is to say the extent of the sealing portion 21 in an axial direction is considerably smaller than the dimension of the sealing portion 21 in a radial direction or circumferential direction. By contrast, the wing portion 22 is of U-shaped form and, here, forms a first wing web 23, facing the end side 02, and a second wing web 24, which is spaced apart from the first wing web, wherein the wing webs 23, 24 extend radially outward.

[0047] The position of the sealing element 11 on the rotor disk 01 is secured by way of a securing plate 19 which 19 is fastened, in front of the sealing element 11, to the fastening protrusion 03 of the rotor disk 01. The insertion of the securing plate 19 into the plate groove 08 provided on the fastening protrusion 03 gives rise to the axial securing of the securing plate 19 and simultaneously of the sealing element 11. Furthermore, in the end position, the securing plate 19 bears, on the radially outwardly facing side, against securing protrusions 18 of the sealing element 11. Thus, radial fixing of the securing element 19 between the sealing element 11 with the securing protrusion 18 and the bottom of the plate groove 08 of the rotor disk 01 is realized. Aside from the securing of the sealing element 11 to the rotor disk 01, the securing plate 19 in this exemplary embodiment simultaneously serves for covering a free space 15 surrounding the fastening protrusion 03, which 15 is provided for allowing the elevation 17 of the sealing element 11 to be fitted into the depression 07 of the rotor disk 01.

[0048] In the following FIGS. 5 and 6, the sealing element 11a is depicted in two perspective views. It is firstly possible to see the lower sealing portion 21 with the fastening receptacle 14 which is situated therein and which serves for receiving the fastening protrusion 03. Situated on that side of the fastening receptacle 14 which faces the rotor axis is the fastening portion 13 for accommodating the centrifugal forces of the sealing element 11. The two securing protrusions 18, as abutment surface for the securing plate 19, are situated on the sealing element 11 at the side facing away from the rotor disk 01. Extending in a circumferential direction, and radially spaced apart from the fastening receptacle 14, is the elevation 17 on the side facing the end side 02.

[0049] The wing portion 22 which adjoins the sealing portion 21 comprises the first wing web 23 on the side facing the rotor disk and, spaced apart from said first wing web, the second wing web 24, which 23, 24 extend radially outward. It can also be seen that in each case one sealing shoulder 28 is provided on the two side peripheries 26 situated in a circumferential direction, which 28 offers a free space, spaced apart from the end side 02, for the arrangement of the sealing tab 27 of the adjacent sealing element 11b.

[0050] FIG. 7 depicts the securing plate 19, which firstly secures the position of the sealing element 11 on the rotor disk 01 and furthermore covers the free space 15, which remains of the fastening receptacle 14, upon the arrangement of the sealing element on the fastening protrusion 03. Here, the securing plate 19 is of U-shaped form.

[0051] FIG. 8 depicts a further exemplary embodiment of a rotor disk arrangement according to the invention in a section analogous to FIG. 3. It is again possible to see, to some extent, the rotor disk 31, on the end side 32 of which a sealing element 41 is arranged. This 41 is, analogously to the preceding exemplary embodiment, hooked onto the rotor disk 31, wherein for this purpose, the rotor disk 31 has a fastening protrusion 33. By contrast to the preceding exemplary embodiment, it is possible in this exemplary embodiment for the fastening protrusion 33 to be formed as an encircling ring.

[0052] Here, the fastening protrusion 33 in turn extends axially beyond the end side 32 to a free end 34. Situated on the side facing the rotor axis is the bearing surface 35, which 35 is in turn inclined so as to slope downward an axial direction toward the free end 34. In a design similar to the preceding exemplary embodiment, a depression 37 in the form of a groove extending in a circumferential direction is provided on the rotor disk 31. For this purpose, the sealing element 41 has, analogously to the preceding exemplary embodiment, an elevation 47 which extends in the circumferential direction. The centrifugal forces that arise in the sealing element 42 during rotation of the rotor disk arrangement are transmitted via the fastening portion 43 to the fastening protrusion 33. By contrast to the preceding exemplary embodiment, the fastening portion 43 extends so as to face in an axial direction toward the rotor disk 31. Owing to the inclined orientation of the bearing surface 35 and the design of the fastening portion 43 complementary thereto, it is in turn ensured that the centrifugal forces cause the sealing element 41 to be pulled onto the rotor disk 31. Analogously to the preceding exemplary embodiment, a sealing portion 51 of the sealing element 41 is of substantially flat form, whereas by contrast, a wing portion 52 has multiple wing webs 53, 54 and 55.

[0053] FIGS. 10 and 11 depict a further exemplary embodiment of a sealing element 71 for use in a rotor disk arrangement according to the invention. Analogously to the first exemplary embodiment, it is possible to see the form of the sealing element 71 with a sealing portion and a wing portion, which has a first wing web 83 and a second wing web 84. An overlapping arrangement of the sealing element 71 is, in this exemplary embodiment, realized by the formation of a sealing tab 87 on a side periphery of the sealing element 71, and the arrangement of a sealing shoulder 88 on the opposite side periphery.

[0054] The axial securing of the sealing element 71 on the rotor disk is in turn realized, analogously to the preceding exemplary embodiments, by way of a radially outwardly extending elevation 77 on the sealing element 71. The contrast to the preceding exemplary embodiments, on the end facing the rotor axis, there is situated a fastening portion 73 which extends in a circumferential direction and which has a radially outwardly extending web and which has a groove 74. In this respect, by way of the elevation 77 and the fastening portion 73, it is possible for the sealing element 71 to be hooked onto the rotor disk. In any case, provision is made for the centrifugal forces in the sealing element 71 to be transmitted in an advantageous manner via the fastening portion 03 facing the rotor axis, wherein radial abutment against the rotor disk may be provided both at the web 73 and at the bottom of the groove 74.

[0055] In this exemplary embodiment, for the radial and tangential securing of the sealing element 71 on the rotor disk, the sealing element 71 is equipped with a securing recess 78 on the side facing the rotor axis, wherein the securing recess 78 is of semicircular form. This allows a securing bolt to be inserted after fitting of the sealing element 71 on the associated rotor disk. Such a securing configuration may obviously likewise be used in the preceding exemplary embodiments for rotor disk arrangements.