EP2873809A1 - Rotor of a fluid flow machine - Google Patents

Abstract

The invention relates to a rotor of a turbomachine. The rotor comprises at least one blade (4, 6, 8), which has an airfoil (20) and a blade root (54, 55, 58), and a rotor base body (2), in particular a disk (2), which faces outwards having open circumferential groove (12) for receiving the blade root (54, 55, 58). In this case, the circumferential groove (12) and the blade root (54, 55, 58) are shaped such that by rotating the blade (4, 6, 8) about an axis (A r, AT) of the blade root (54, 55, 58) in the circumferential groove (12) is securable.

Description

The invention relates to a rotor of a turbomachine according to the preamble of claim 1.

Such a rotor is from the document US 7,708,529 B2 known. The rotor has in a rotor disk a C-shaped radially outwardly opened circumferential groove with recesses on the legs of the C-shaped circumferential groove. Through these recesses, the blade feet are pivoted. Furthermore, this rotor has an annular fuse which is fastened between a lower side of the inner shroud of the blade and on a radially outer surface of the rotor disk in order to prevent the blades from swinging out of the circumferential groove.

This structure is disadvantageous in particular, since the transitions from such recesses to the projections of the rotor arranged on the circumferential groove can weaken the rotor disk structurally in such a way that such rotors can experience a notch effect at these transitions and corresponding cracks can arise at these points. In the worst case, it can even lead to the failure of a rotor.

Thus, the object of the present invention is to overcome these disadvantages.

The object is solved by the features of claim 1.

The invention relates to a rotor of a turbomachine. The rotor comprises at least one blade, which has an airfoil and a blade root, and at least one rotor base body, in particular a disk, which has an outwardly open peripheral groove for receiving the blade root. The circumferential groove and the blade root are shaped such that the blade root can be secured in the circumferential groove by rotating the blade about an axis.

This has the advantage that the blades are already secured in the groove immediately after turning. Another backup is omitted. This saves a lot of assembly time. In this case, the circumferential groove can be executed with a low notch factor.

Further advantageous embodiment of the invention are given in the dependent claims.

In an advantageous embodiment of the invention, the axis runs parallel to the perpendicular of the axis of rotation of the rotor body. Alternatively or in combination, the axis extends radially to the rotor body.

This is particularly advantageous because the absolute movements for securing the blade are relatively small. In case of repair, a defective bucket can be removed without removing the rotor body from the engine.

In a further advantageous embodiment of the invention, the rotor in the circumferential groove comprises a securing element, in particular a securing wire, which rests against the underside of the blade root.

This is particularly advantageous because it effectively prevents the blades from falling into the circumferential groove when the rotor or disk stops rotating and the centrifugal force stops pressing the blades radially outward. The fuse element can be designed as a c-shaped fuse wire and in the non-installed state have a slightly larger radius than in the installed state. Thus, the fuse wire is biased in the circumferential groove and can be supported on all blades. The fuse wire thus undergoes a centering and does not touch the base of the circumferential groove. The securing element may be formed as a sheet metal.

In a further advantageous embodiment of the invention, the blade root has a securing element complementary shaped guide element, in particular a guide groove on.

This is particularly advantageous because the blade only then engages when the blade is properly placed in the circumferential groove. The securing element does not necessarily have to be arranged centrally in the blade root. The guide groove may be formed in the lower surface of the blade root or the guide groove may be formed laterally in the blade root.

In a further advantageous embodiment of the invention, the blade, in particular between the blade and the blade root, on a transversely extending to the blade inner shroud, so that when installed only a first ridge of the inner shroud forms a gap together with the disc. In this case, the distance of the gap may be zero, so that the first web touches the disc, in particular the downstream leg of the disc. It should be noted that the inner shroud has an upstream web and a downstream web. Preferably, the downstream land is the first land. During operation of the Tuebwerk (stationary or transient gas turbine), the flow pressure then presses the individual blade onto this first web and thus ensures the correct positioning of the blades in the axial direction.

In a further advantageous embodiment of the invention, the constriction of the circumferential groove is so large that when turning the blades about the axis of the blade root is inserted into the circumferential groove and / or the bottleneck of the legs is so small that in the installed state, the bearing surfaces of the blade root on the bearing surfaces of the legs are.

This is particularly advantageous because the individual blades do not need to be threaded over a passage made in the legs and then have to be moved in circumferential alignment along the circumferential groove to their position, in the worst case even to the diametrically opposite position to the passage. According to the invention, the blades can be introduced at any point of the circumferential groove. This has the advantage that assembly time can be saved. In addition, no passage is needed which weakens the disk material and constitutes a potential break point.

In a further advantageous embodiment of the invention, the constriction of the circumferential groove is greater than a depth of the blade root. Alternatively or in combination there is bottleneck the circumferential groove is smaller than the width of the blade root. In all cases, the width of the blade root is greater than the depth of the blade root, wherein the width in the installed state of the blade reflects the expansion of the blade root in the axial direction of the rotor body and the depth reflects the expansion of the blade root in the radial direction of the rotor body.

This is particularly advantageous in that the blades can be introduced into the circumferential groove along a radial axis, and then the blade is secured in the groove by rotation about the radial axis. In rotors with many blades so that the bottleneck of the circumferential groove can turn out smaller and surrounding the peripheral groove material may be less, so that the rotor can be slimmer and thus easier to design.

In a further advantageous embodiment of the invention, the rotor comprises a circumferential securing, which has a head region with a receptacle for a part of at least one blade root. Furthermore, the blade root has a complementarily shaped overhang for receiving.

This is particularly advantageous because the circumferential securing is positively connected to the adjacent blade. This prevents that the blades can move within the circumferential groove. Preferably, two adjacent blade roots have complementary shaped overhangs, so that they are arranged in the receptacle of the circumferential securing. The shape of the support surface of the recording can be arbitrary. The shape of the support surface may be curved, flat, roof-shaped, spherical or cylindrical.

In a further advantageous embodiment of the invention, the rotor comprises a circumferential securing with a foot region which rests on the base of the circumferential groove.

The circumferential securing can be fixed in the circumferential groove via different types of fastening. For example, a screw (eg grub screw) can fix the perimeter lock to the window. Also conceivable are sheet metal and / or wire elements.

In a further advantageous embodiment of the invention, the rotor base body has at least one recess and / or an increase in the base of the circumferential groove. Furthermore, the circumferential securing has a foot region, which is arranged in the second recess.

Preferably, the recess, in particular the second recess, is butterfly-shaped. The circumferential securing is displaced radially until the foot area of the circumferential securing device is inserted into this recess. The recess may also have at least one stop, which extends transversely to the circumferential groove. The circumferential securing can only be turned in the circumferential groove until the foot area reaches the stop. The stop ensures that the width of the circumferential securing runs exactly perpendicular to the circumferential groove, as over-tightening can be avoided. In addition, the stop provides a positive circumferential securing with the disc, d. H. The disk together with blades, circumferential securing and securing element can not rotate in the circumferential direction in itself. In contrast to the holder, the circumferential securing preferably has no opening. After the holder and the fuse element has been inserted into the corresponding opening, the circumferential securing serves as a stop for the securing element, so that it can no longer leave its position. However, the circumferential securing can also have a bag or passage opening in order to receive and fix the securing element ends.

An elevation may be formed on the base of the circumferential groove and project radially outward so as to be integral with the disc.

In a further advantageous embodiment of the invention, the width of the head region of the circumferential securing is greater than the constriction of the legs.

In a further advantageous embodiment of the invention, the height of the circumferential securing is at least as large as the groove height. Furthermore, the rotor comprises at least one groove transverse to the circumferential groove for receiving the circumferential securing.

This is particularly advantageous since such a groove prevents the circumferential securing can move along the circumferential groove. Thus, the blades are secured in the circumferential groove.

In a further advantageous embodiment of the invention, the height of the circumferential securing is smaller than the groove height. At least one side wall, in particular a leg, of the circumferential groove has a, in particular third, receptacle for the circumferential securing.

This also ensures the scope of coverage. Preferably, this third recording can be formed circular segment. Thus, the circumferential securing can be screwed into the circumferential groove.

- Figur 1:

eine Schrägansicht von einem Teil eines Rotor mit einigen ein- gebauten Schaufeln und eine Umfangssicherung,

- Figur 2:

eine Schrägansicht von einigen Schaufeln mit einer Umfangssicherung und einer Halterung,

- Figur 3:

die gleiche Ansicht wie in Figur 2, jedoch mit weniger Schaufeln,

- Figur 4A:

einen Schnitt quer durch die Umfangsnut der Scheibe, wobei die Schaufel im eingebauten Zustand abgebildet ist,

- Figur 4B:

einen Schnitt quer durch die Umfangsnut der Scheibe, wobei die Schaufel im gekippten Zustand abgebildet ist,

- Figur 5

eine axiale Ansicht auf einen Teil des Rotors mit eingebauten Schaufeln,

- Figur 6

einen Schnitt quer durch die Umfangsnut der Scheibe, wobei die Halterung abgebildet ist,

- Figur 7

eine Draufsicht auf die Umfangsnut in radialer Richtung, und

- Figur 8

einen Schnitt quer durch die Umfangsnut der Scheibe, wobei zwei Ausführungsformen der Umfangssicherung abgebildet sind.

Furthermore, preferred embodiments of the invention will be described in more detail with reference to the schematic drawing. Showing:

- Figure 1:

an oblique view of a part of a rotor with some built-in blades and a circumferential securing,

- Figure 2:

an oblique view of some blades with a circumferential securing and a holder,

- Figure 3:

the same view as in FIG. 2 but with fewer blades,

- Figure 4A:

a section across the circumferential groove of the disc, wherein the blade is shown in the installed state,

- Figure 4B:

a section across the circumferential groove of the disc, wherein the blade is shown in the tilted state,

- Figure 5

an axial view of a part of the rotor with built-in blades,

- Figure 6

a section across the circumferential groove of the disc, wherein the holder is shown,

- Figure 7

a plan view of the circumferential groove in the radial direction, and

- Figure 8

a section across the circumferential groove of the disc, wherein two embodiments of the circumferential securing are shown.

The FIG. 1 shows an oblique view of a part of a rotor with a rotor body 2, with some built-in blades 4, 6 and 8 and a circumferential securing 10. The rotor body 2 may be a disc or a disc ring. In this embodiment, there are three different blades 4, 6 and 8, which differ in particular in the shape of their blade roots 54, 55 and 58 in the circumferential direction. The disc 2 has an in particular C-shaped circumferential groove 12, in which the blade roots 54 of the first blade 4, the blade roots 55 of the second blade 6 and the blade roots 58 of the third blade 8 are arranged. The circumferential groove 12 has a base 14 and at the two ends of the base 14 each have a leg 16 and 18 (see also FIGS. 4A and 4B ), which form the side walls of the circumferential groove 12. The downstream leg 16 (or first leg) is larger in radial dimension as compared with the upstream leg 18 (hereinafter referred to as the second leg). The bucket 4 has an inner shroud 24 extending in the axial direction (the sheave 2) between a radially outwardly extending airfoil 20 and a radially inwardly extending blade root 22. The inner shroud 24 has a downstream web 26 (hereinafter referred to as the first web) ) and an upstream land 28 (hereinafter referred to as the second land). In this case, the underside 30 of the first web 26 is located on the upper side 32 of the first leg 16.

The circumferential groove 12 also has a second radially inwardly extending groove 34 which is recessed in the two legs 16 and 18. In these two second grooves 34, the circumferential securing 10 is arranged.

In the FIGS. 2 and 3 is an oblique view of some blades with a circumferential securing 10 and a bracket or wire holder 36 shown. For better understanding were in the FIGS. 2 and 3 the disc 2 not mitabgebildet. Furthermore, in FIG. 3 the blades between the circumferential securing 10 and the wire holder 36 are not shown for better understanding. In the front area the girth guard 10 can be seen. The circumferential securing device 10 has a substantially rectangular upper head region 38 and an essentially likewise rectangular foot region 40. In the radial direction of the disc 2, the height h _{U of} the circumferential securing extends 10. In the circumferential direction, the depth t _{U of} the circumferential securing extends 10. In the axial direction extends the head portion 38 of the circumferential securing 10 in the width b _U. The circumferential securing 10 has in the head area 38 a - here arcuate - first receptacle 42. The wire holder 36 has a head 44 and a substantially rectangular foot 46. The wire holder 36 has in the head 44 a - here arcuate - second receptacle 48. The two receptacles 42 and 48 are preferably formed identically. In the middle of the wire holder 36, an opening 50 or bore is embedded. Through this opening 50, a securing element or securing wire 51 runs.

Between the circumferential securing 10 and the wire holder 36, three different blades 4, 6 and 8 are arranged with a depth T (see FIG. 2 ). These blades 4, 6 and 8 differ by the different configuration of the corresponding blade roots 54, 55, 58 in the circumferential direction. The first blade 4 has a first blade root 54, in which the circumferential surface 10 facing end face 52 has a first receptacle 42 complementary shaped overhang 56. The end faces of the second blade roots 55 of the two second blades 6 are planar. The third blade 8 has a third blade root 58, in which the end face 52 facing the wire holder 36 has an overhang 60 that is complementary to the second receiver 48.

In the FIG. 4A is a section across the circumferential groove 10 of the disc 2 reproduced, the second blade 6 is shown in the installed state. In the FIG. 4B is a section through the circumferential groove 10 of the disc 2 reproduced, wherein the second blade 6 is shown in the tilted state, to be subsequently rotated about the parallel axis A _T , said axis A _{T is} parallel to the vertical axis of the rotor. The width of the circumferential groove 10 at the narrowest point between the legs 16 and 18 is referred to as S _E.

In operation, the flow flows from right to left and is indicated by the flow direction 62. The lower region of the second substantially dovetail-shaped blade root 55 of the second blade 6 has a third groove 64 in order to receive the securing wire 51. The other blade roots 54 and 58 may be similarly configured in this regard and may have a shaped groove similar to the third groove 64 in the lower region. It should be noted that the opening 50 of the wire holder 36 is aligned with the third groove 64. The bottom 30 of the first web 26 is located, as in FIG. 4A The oblique bearing surfaces 66 and 68 of the blade root 55 are located on the inclined bearing surfaces 70 and 72 of the circumferential groove 10. This constriction S _E between the legs 16 and 18 is so large that when pivoting the Blades 4, 6 or 8, for example, about the parallel axis A _{T of} the blade root 55 (as well as the other blade roots 54 and 58) is inserted into the circumferential groove 10 and the constriction S _E between the legs 16 and 18 is so small that in installed state, the bearing surfaces 66 and 68 of the blade root 55 on the bearing surfaces 70 and 72 of the legs 16 and 18 abut.

Alternatively, for example, the second blade 6 (also the other blades) may be rotated about the radial axis A _r to be secured in the circumferential groove 12. For this purpose, this second blade 6 is displaced radially in advance along the radial axis A _r , the depth T of the blade 6 being aligned parallel to the constriction S _E. Only when the blade root 55 has been sufficiently far inserted into the circumferential groove 12, the second blade 6 can be rotated about the radial axis A _r until the locking wire 51 snaps into the third groove 64 (guide). Then, the width B of the second blade 6 is oriented substantially parallel to the constriction S _E.

It is in the FIGS. 4A and 4B to recognize that the width B of the blade roots 55 is greater than the constriction S _E.

According to the invention, to secure the blades 4, 6 and 8 in a blade-disc assembly, a certain number of blades 4, 6 and 8 with a forming element, here with the fuse wire 51 and one or more circumferential fuse 10 and one or more wire holders 36 mounted. The number of fuse elements used to 10 and 36 and fuse wires 51 is variable and determines the pitch and the number of required second radial grooves 34 in the disc 2. The circumferential fuses 10 are used after completion of the entire assembly as a stop for the fuse wire 51st This is thus form-fitting in the circumferential direction secured. The wire holders 36 are held in the radial direction by dovetail contact surfaces 70 and 72 in the disc 2. The securing wire 51 is in turn prevented from falling out by the wire holders 36, since the wire holders 36 rest against the disc 2 on the base 14 in the direction of the axis of rotation. The elasticity of the safety wire 51 ensures that the blades can be tipped by slightly pushing the safety wire 51 (see FIG Figures 4B and 5 ). When tilting example. The first blade 4 of the fuse wire 51 gives way to the side and radially downwards, as in FIG. 5 When reaching the final mounting position of the blade root, the securing wire 51 elastically springs back to its neutral position, so that this securing wire 51 rests in the third groove 64. Due to the positive guidance of the securing wire 51 in the third groove 64 of the blade roots 54, 55 and 58, the blades 4, 6 and 8 are held in the dovetail guide (circumferential groove 12) of the disc 2 and can not tilt when the rotor is stopped. The circumferential securing element 10 is held in the radial direction of the blade 4 after installation. The wire holders 36 are held according to the invention by a dovetail approach in the circumferential groove 12. The opening 50 of the wire holder 36 is dimensioned so large that the fuse wire 51 is not applied to this wire holder 36 under load.

In the following, a possible assembly of the rotor is reproduced. In the first step, the circumferential fuses 10 can be mounted by radial insertion into the corresponding grooves in the disc 2. After mounting the circumferential fuses 10, the wire holders 36 are screwed or tilted into the circumferential groove 12 of the disc 2. Thereafter, the fuse wire 51 can be mounted. This safety wire 51 is inserted through the holes or holes 50 of the wire holders 36. After assembly of all security elements, the blades 4, 6 and 8 are mounted by tilting or by turning. In a corresponding order, the blades 4 and 8 resting on the securing parts (wire holder 36 or circumferential securing device 10) must first be pivoted into the circumferential groove and pushed to their target position in the circumferential direction. Thereafter, the remaining blades 6 can be mounted. Dismantling is carried out analogously in reverse order.

In the FIG. 6 is a section through the circumferential groove 12 of the disc 2 reproduced, wherein the wire holder 10 in the head 44 has the second receptacle 48. Therein, the overhang 56 of the first blade root 54 of the first blade 4 is located FIG. 6 Two embodiments of the foot 46 of the wire holders 36 are shown. The first embodiment of the foot 46 extends to the base 14 of the circumferential groove 12. In the second embodiment, in the base 14 of the circumferential groove radially inwardly extending first substantially butterfly-shaped recess 69 is recessed (see also FIG. 5 , shown in dashed lines). In this first recess 69, the extended portion 71 of the foot 46 is arranged (hatched area).

In the FIG. 7 is a plan view of the circumferential groove 12 in the radial direction on the first recess 69 and a second recess 78 (see below) reproduced. Running in the middle from top to bottom, the circumferential groove 12 is shown. On the left, the circumferential groove 12 is bounded by the first leg 16. On the right, the circumferential groove 12 is bounded by the second leg 18. In the first recess 69, the extended portion 71 is hatched once and shown once in dashed lines. When mounting the wire holder 36 in the circumferential groove 10, the wire holder 36 is inserted with the dashed orientation perpendicular to the page level. Once the extended portion 71 is disposed in the first recess 69, the wire holder 36 can be rotated about the rotation axis 70 in a clockwise direction until the extended portion 71 abuts the perpendicular to the circumferential groove 12 extending stop 72 of the first recess 69.

In the FIG. 8 is a section through the circumferential groove 12 of the disc 2 shown, wherein two embodiments of the circumferential securing 10 are shown. The first embodiment is shown on the right side. The circumferential securing 10 corresponds to the one shown in FIG. This is inserted radially from outside to inside in the second grooves 34. It should be noted that the second grooves 34 in the legs from outside to inside the circumferential groove 12 extend. These second grooves 34 are also in the FIG. 7 displayed. In this case, the head area 38 of the circumferential securing device 10 is larger than the constriction S _E between the legs 16 and 18.

In a second embodiment of the circumferential securing 10 ', the height h _U ' of the circumferential securing device 10 from the base 14 to the end of the head region 38 is smaller than the groove height h _N. In contrast to the first embodiment, this circumferential securing 10 ', like the wire holder 36, is rotated into the circumferential groove 12. For this purpose, third receptacles 74 must be embedded in the legs 16 and 18, which are preferably arcuate (see FIG. 7 ). Additionally or alternatively, the circumferential guard 10 'may have an extended foot portion 76, such as the wire retainer 36 in FIG FIG. 6 , In this case, the circumferential groove 12 has a second recess 78 for the extended foot region 76. The second recess 78 may be shaped in the same way as the first recess 69. The circumferential securing device 10 'is then screwed into the peripheral groove 12 in exactly the same way as the wire holder 36 with an extended foot region 71.

The securing of the blades in the circumferential direction is carried out by securing parts used (circumferential securing 10 and wire holder 36) which engage positively in the circumferential groove 10 of the disc 2. Tipping out of individual blades 4, 6, and 8 is prevented by a former (e.g., lock wire 51) on the blade roots 54, 55, and 58. With the help of this safety wire creates a positive connection for the entire disc-blade composite. Slippage of the wire in the circumferential direction is prevented by the circumferential securing 10. When installed, and in particular during operation, all fuse wires are quasi stress-free and do not form a life-minimizing component. In operation, the securing elements (in particular the securing wires 51) are applied over a large area to the adjacent components. As a result, hardly any edge or point loads and the associated voltage spikes in the material. The assembly takes place without plastic deformation or screw connections. In order to avoid undefined material stresses caused by deformation and thus possible cracking. Due to the nature of the construction, the centrifugal force of the securing elements distributed during operation almost uniformly on the blades. By appropriate design also the unbalanced load of the dovetail of the blades 4, 6 and 8 is minimized. In addition, there is no mechanical connection between the disk 2 and the safety wire 51. In particular, this prevents fretting between these two components.

You can use any number of locking wires on the entire circumference and any number of wire holders on a single disk. If only a single continuous safety wire is used, it must run over the entire circumference of the rotor. The fuse wire may be pre-bent for ease of assembly.

The invention can be used in particular in the compressor and in the turbine area of turbomachines.

LIST OF REFERENCE NUMBERS

2

disc

4

first shovel

6

second shovel

8th

third shovel

10

extensive safety

12

circumferential groove

14

Base

16

downstream leg (first leg)

18

upstream leg (second leg)

20

airfoil

22

Shovel foot of 4

24

Inner shroud

26

first jetty

28

second bridge

30

Bottom of 26

32

Top of 16

34

second groove

36

bracket

38

Head area of 10

40

Foot area of 10

42

first shot of 10

44

Head of 36

46

Foot of 36

48

second shot of 36

50

Opening of 36

51

fuse element

52

face

54

first blade foot of 4

55

second blade foot from 6

56

Overhang of 54

58

Shovel foot of 8

60

Overhang of 58

62

flow direction

63

Bottom of 8

64

Guide element (third groove)

66

contact surface

68

contact surface

69

first recess

70

axis of rotation

71

extended area of the foot 46

72

attack

74

third recording

76

extended area of the foot area of 40

78

second recess

79

gap

81

increase

A _r

radial axis

A _T

parallel axis

B

Width of the blade foot

b _U

Width of the header area of the perimeter guard

h _N

groove height

hu, h _U '

Amount of girth security

S _E

Narrowing between the thighs

T

Depth of the blade foot

Claims (15)

Rotor of a turbomachine with: at least one blade (4, 6, 8) having an airfoil (20) and a blade root (54, 55, 58), a rotor base body (2), in particular a disk (2), which has an outwardly open peripheral groove (12) for receiving the blade root (54, 55, 58),
characterized in that
the circumferential groove (12) and the blade root (54, 55, 58) are shaped such that by rotating the blade (4, 6, 8) about an axis (A _r , A _T ) into the circumferential groove (12) of the blade root (12) 54, 55, 58) is securable. Rotor according to claim 1, characterized in that the axis (A _T ) parallel to a vertical axis of rotation of the rotor base body (2) and / or the axis (A _r ) extends radially to the rotor base body (2). Rotor according to one of the preceding claims, characterized in that the rotor in the circumferential groove (12) has a securing element (51), in particular a safety wire, which rests against the underside (63) of the blade root (54, 55, 58). Rotor according to at least one of the preceding claims, characterized in that the blade root (54, 55, 58) has a securing element (51) complementary shaped guide element (64), in particular a guide groove. Rotor according to at least one of the preceding claims, characterized in that the blade (2) has a transverse to the blade (20) extending inner shroud (24), so that at least one web (26) of the inner shroud (24) together with the rotor base body (2 ) forms a gap (79). Rotor according to at least one of the preceding claims, characterized in that a constriction (S _E ) of the circumferential groove (12) is so large that when rotating the blades (4, 6, 8) about the axis (A _r , A _T ) of the Blade root (54, 55, 58) in the circumferential groove (12) is insertable. Rotor according to at least one of the preceding claims, characterized in that the constriction (S _E ) is so small that at least one bearing surface (66, 68) of the blade root (54, 55, 58) located on at least one in the circumferential groove (12) Bearing surface (70, 72) is applied. Rotor according to at least one of the preceding claims, characterized in that the constriction (S _E ) is greater than a depth (T) of the blade root (54, 55, 58) and / or the constriction (S _E ) is smaller than the width ( B) of the blade root (54, 55, 58), wherein the width (B) of the blade root (54, 55, 58) is greater than the depth (T) of the blade root (54, 55, 58). Rotor according to at least one of the preceding claims, characterized in that the rotor comprises a circumferential securing (10) having a head portion (38) with a first receptacle (42) for a part of at least one blade root (54, 58), and the blade root (54, 58) has a complementary to the first receptacle (42) shaped overhang (56, 60). Rotor according to at least one of the preceding claims, characterized in that the rotor comprises a circumferential securing means (10) with a foot region (40) which rests on the base (14) of the circumferential groove (12). Rotor according to at least one of the preceding claims, characterized in that the rotor base body (2) has at least one recess (78) and / or elevation (81) in the base (14) of the circumferential groove (12) and / or the circumferential securing means (10 '; ) has a foot portion (40, 76) disposed in the recess (78). Rotor according to one of claims 9 to 11, characterized in that the width (b _U ) of the head region (38) of the circumferential securing (10) is greater than the constriction (S _E ). Rotor according to claim 12, characterized in that the height (h _U ) of the circumferential securing (10) is at least as large as the groove height (h _N ) and that the rotor at least one groove (34) transverse to the circumferential groove (12) for receiving the Has circumferential fuse (10). Rotor according to claim 12, characterized in that the height (h _U ') of the circumferential securing (10) is smaller than the groove height (h _N ) and at least one side wall (16, 18) of the circumferential groove (12) has a receptacle (74) for the circumferential securing (10). Turbomachine with a rotor according to at least one of the above claims.

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