EP3006667A1 - Turbine rotor blade, assembly consisting of a turbine shaft, a turbine wheel disc, a plurality of turbine rotor blades and a balancing weight and turbine - Google Patents

Abstract

The invention relates to a turbine blade (1; 101; 201; 301; 401; 501; 601) having an airfoil (2; 602) and a blade root (3; 103; 203; 303; 403; 503; 603) for locating on one A turbine wheel disk (10; 310) of a turbine shaft (12), wherein the turbine blade (1; 101; 201; 301; 401; 501; 601) comprises a balance weight receiving means (13; 113; 213; 313; 413; 513; 613) for Comprises holders of at least one balance weight member (14; 314; 451; 551) on the turbine blade (1; 101; 201; 301; 401; 501; 601).

Description

The invention relates to a turbine blade with an airfoil and a blade root for placement on a turbine wheel of a turbine shaft.

The invention also relates to an arrangement comprising a turbine shaft rotatable about a rotation axis of a turbine, in particular a gas turbine, from a turbine wheel arranged on this turbine shaft, a plurality of turbine blades arranged on the turbine blades, and at least one balancing weight element for leveling a through the turbine shaft and / or unbalance caused by the turbine wheel disc, in which the at least one balancing weight element is arranged in a balancing plane extending along the axis of rotation.

The invention further relates to a turbine, in particular a gas turbine, with a plurality of turbine blades.

Generic turbine blades, which are supported on a turbine wheel disk together with a turbine shaft as an arrangement around a rotation axis of a turbine, are known from the prior art as turbine rotors. Such a turbine can be designed manifold, for example as a steam or gas turbine or the like.

In order to ensure the lowest possible vibration-free operation of the turbine, it is usually essential to balance rotating components, such as in particular a rotating about a rotational axis turbine rotor.

It is an object of the invention, in particular generic turbine blades further develop such that commissioning and / or maintenance of a turbine, in particular with regard to balancing work of balancing processes can be made easier.

The object of the invention is achieved by a turbine blade having an airfoil and a blade root for locating on a turbine wheel disk of a turbine shaft, the turbine blade having a balance weight receiving device for supporting at least one balancing weight member on the turbine blade.

Characterized in that the balancing weight-receiving device according to the invention on the turbine blade - and not as usual on the Turbinenradscheibe or turbine shaft - is arranged, this balancing weight-receiving device is much more accessible, so that, for example, even a repeated balancing an arrangement of turbine shaft, turbine wheel and turbine blades, that is, the entire turbine rotor, can be made significantly easier, since the corresponding balancing weight receiving device is more accessible from the outside.

In this respect balancing processes can be optimized with very little effort. For example, unstacking work can be avoided on a turbine due to a strong imbalance of a turbine wheel.

In this case, the balancing weight receiving device can configure an almost arbitrary cavity for accommodating a balancing weight element, as will be explained later by way of example.

Depending on the concrete design of the turbine, it may already be sufficient if only one turbine blade is equipped with one or more such balancing weight-receiving devices. Alternatively, however, you can do more be prepared as a turbine blade, if appropriate.

A preferred embodiment provides that at least one balance weight element is arranged on the receiving device arranged on the turbine blade, by means of which an imbalance inherent in the turbine wheel disk and / or the turbine shaft can be equalized.

As a result, it is structurally very easy to arrange at least one balancing weight element radially far further outwardly than a turbine wheel disk with respect to the rotational axis of the turbine shaft of a turbine.

The object of the invention is also based on an arrangement of a turbine shaft rotatable about a rotation axis of a turbine, in particular a gas turbine, of a turbine wheel arranged on this turbine shaft, of a plurality of turbine blades arranged on the turbine wheel disk, and of at least one balancing weight element for leveling one the turbine shaft and / or unbalance caused by the turbine wheel disc, wherein the at least one balance weight element is arranged in a along the axis of rotation extending balancing plane, said balancing plane passes through the axis of rotation and by a arranged on a turbine blade balancing weight-receiving device.

As a result of the arrangement according to the invention, disassembly work on a turbine is reduced in particular with a corresponding design of the arrangement, balancing weight elements should be exchanged again or repositioned to balancing weight receiving devices.

The term "balancing plane" in the context of the invention describes a plane in which the at least one balancing weight element is arranged, wherein in a plurality of such Balancing weight elements can also be present several such balancing planes.

Advantageously, in the present case, a substitution of a particular balancing plane, in particular out of the turbine wheel disk, can be carried out into the turbine blade, whereby the accessibility to balancing weight elements of the arrangement is substantially improved.

In addition, by laying such a balancing plane to a larger diameter smaller balancing weight elements can be used, so that larger imbalances can be compensated with the same balancing weight masses. Conversely, this means that small balancing weight elements can be used to compensate for equal imbalances.

Thus, it is advantageous if the balancing plane extending along the axis of rotation runs through a blade root of a turbine blade.

It is understood that the balancing plane is continued in the turbine wheel. Thus, related balance weight receiving grooves not only extend in the blade roots, but are also continued in the turbine wheel, so that a self-contained annular groove can form, in which the balancing weight elements can be distributed freely distributed in the circumferential direction.

Cumulatively or alternatively, the at least one balance weight element can be arranged in a curved balancing plane running concentrically around the rotation axis, wherein the curved balancing plane runs through a blade root of the turbine rotor blades arranged on the turbine wheel disk.

In this respect, it is advantageous if this balancing plane is arranged radially at the level of a blade root of a turbine blade.

The balancing weight receiving device can be arranged on a by the along the axis of rotation extending balancing plane and by the concentric about the axis of rotation extending curved balancing point generated intersection.

The curved balancing plane can be arranged radially outside the turbine wheel disk, so that the at least one balancing weight is arranged radially even further outwards.

As a result of the balancing plane lying radially further outward according to the invention, an imbalance inherent in a turbine wheel disk can be even better compensated. This is due in particular to the fact that such an imbalance can be compensated for much more effectively by means of the balancing weight element arranged with respect to the axis of rotation of the turbine shaft on a larger diameter.

The present arrangement can be balanced particularly well if a material recess and / or material accumulation arranged on the turbine wheel disk and / or on the turbine shaft are designed to generate an imbalance on the turbine wheel disk and / or on the turbine shaft on the turbine wheel disk and / or on the turbine shaft are that this imbalance can be equalized with at least one balancing weight element arranged on the turbine blade.

Advantageously, a defined unbalance is generated on the turbine wheel disc and / or on the turbine shaft, to which at least one balancing weight element can be precisely tuned and moreover can be arranged or placed precisely predeterminably on at least one of the turbine rotor blades.

Such an imbalance can be generated, for example, by appropriate introduced in a turbine wheel unbalance holes. These unbalance bores are preferably introduced at defined positions on the turbine wheel disk, such that an imbalance caused thereby can be compensated for in a targeted manner by a correspondingly positioned turbine blade and / or by means of balancing weight elements positioned correspondingly on the turbine blade.

To compensate for the imbalance produced by these unbalance bores, one or more turbine blades equipped with one or more balancing weight elements are secured to the turbine wheel disc locations provided therefor.

Thus, a particularly smooth running of a turbine rotor on a turbine can be ensured by a specific combination of turbine wheel disks provided with unbalance bores or generally with imbalance-generating means and turbine rotor blades equipped with balancing weight elements.

It is understood that instead of such unbalance holes, which require a removal of material on the respective component, other means for generating a defined imbalance can be provided, such as a targeted material application.

Cumulatively or alternatively, a turbine shaft may also include such unbalance generating means.

A further preferred embodiment provides that the arrangement comprises at least one turbine blade according to one of the features described here. For symmetry reasons, it is advantageous if all turbine blades are the same.

By virtue of a turbine blade designed in this way, the balancing plane can be shifted correspondingly far radially outwards, so that a more complex arrangement of a balancing weight element on a turbine wheel disc or on a turbine shaft is superfluous.

In this respect, the object is also achieved by a turbine, in particular by a gas turbine, with a plurality of turbine blades, the turbine comprising at least one turbine blade or an arrangement according to one of the features explained herein.

To be able to arrange, for example, the balancing plane in a structurally simple manner radially at the level of the blade root of the turbine blade, it is advantageous if the balancing weight receiving device is arranged on the blade root of the turbine blade.

Ideally, the balancing weight element arranged in the turbine blade is secured by the insertion of the blade root into a turbine base receptacle provided for this purpose.

It will be appreciated that the balance weight receiving means provided on the turbine blade may be configured differently to attach a balance weight member to the turbine blade so as to balance an assembly of a turbine shaft, at least one turbine wheel mounted thereon, and turbine blades supported thereon.

Preferably, the balancing weight-receiving device has a balancing weight-receiving groove for receiving the at least one balancing weight element, wherein the balancing weight-receiving groove is arranged transversely to the longitudinal extent of the blade.

Along such a balance weight-receiving groove, a balancing weight element for a balancing process can be moved very easily to the required position.

Within the balance weight-receiving groove, it is also possible, if necessary, to arrange several balancing weight elements.

In a turbine blade properly mounted on the turbine wheel, the balance weight-receiving groove preferably extends in the circumferential direction of the turbine wheel, so that in a corresponding configuration arranged in the balance weight-receiving groove balancing weight element can be moved in the circumferential direction of the turbine wheel to achieve optimum balance result can.

Cumulatively or alternatively, it is possible that the balancing weight-receiving device has a balancing weight-receiving bore for receiving the at least one balancing weight element, wherein the balancing weight-receiving bore is arranged in the direction of the longitudinal extent of the blade.

By means of such a balance weight-receiving bore it is structurally very easy to hold a balancing weight element easily plugged on the turbine blade. It is understood that the balancing weight element can also be screwed, clamped or the like with a corresponding configuration.

Both the balance weight receiving groove and the balance weight receiving bore may be located at different locations on the turbine blade.

Preferably, the balance weight-receiving groove and / or the balance weight-receiving bore are located on the blade root, more precisely within the blade root, the turbine blade.

Furthermore, it is advantageous if the balancing weight receiving bore is accessible from the direction of the turbine blade. As a result, balancing weight elements, for example, can already be easily inserted into the respective balancing weight receiving bore in the case of preassembled turbine rotor blades or taken out of it. However, it should be ensured that the construction is carried out so that the balancing weight elements in a rotation of the turbine wheel do not disengage from their locating holes and fly off radially outward due to centrifugal force. In this respect, a suitable positional fixing must be ensured, for example by a thread, which is preferably self-locking, or the like.

Furthermore, it is advantageous if a plurality of balancing weight-receiving bores is arranged next to one another in the circumferential direction of the turbine wheel disc, since in this way a turbine rotor can be balanced even more precisely.

It should be noted that the present invention can be applied not only to turbines but also to compressors.

Further features, effects and advantages of the present invention will be explained with reference to the appended drawing and the following description, in which example turbine blades according to the invention equipped with balancing weight receiving devices are shown and described. Components which in the individual figures at least substantially coincide with respect to their function may in this case be identified by the same reference symbols, the components not having to be numbered and explained in all the figures.

Figur 1

schematisch eine Ansicht einer ersten Turbinenlaufschaufel mit einer an dem Schaufelfuß angeordneten und von der Bodenseite des Schaufelfußes her zugänglichen Wuchtgewicht-Aufnahmeeinrichtung;

Figur 2

schematisch eine Lageansicht von an in einer Turbinenlaufschaufel angeordneten vier Wuchtgewichtelementen und von in einer Turbinenradscheibe eingebrachten Unwucht erzeugenden Mitteln in Gestalt von drei Unwuchtbohrungen hinsichtlich einer fiktiven Anordnung aus einer Turbinenwelle, einer hieran angeordneten Turbinenradscheibe und von daran gehalterten Turbinenlaufschaufeln;

Figur 3

schematisch eine Ansicht einer weiteren Turbinenlaufschaufel mit einer an der Rückseite bzw. Stirnseite des Schaufelfußes angeordneten Wuchtgewicht-Aufnahmeeinrichtung;

Figur 4

schematisch eine Ansicht einer alternativen Turbinenlaufschaufel mit einer an der Rückseite bzw. Stirnseite, aber außerhalb des Schaufelfußes angeordneten Wuchtgewicht-Aufnahmeeinrichtung;

Figur 5

schematisch eine Ansicht eines mit einer Wuchtgewicht-Aufnahmenut versehenen Schaufelfußes einer Turbinenlaufschaufel;

Figur 6

schematisch eine um 90° gedrehte Ansicht des in der Figur 5 gezeigten Schaufelfußes;

Figur 7

schematisch eine perspektivische Ansicht eines in die in den Figuren 5 und 6 sowie 8 und 9 gezeigten Wuchtgewicht-Aufnahmenut einsteckbaren Wuchtgewichtelements;

Figur 8

schematisch einen Ausschnitt einer Montageansicht mit in einer Turbinenradscheibe gehalterten Turbinenlaufschaufeln aus den Figuren 5 und 6;

Figur 9

schematisch eine Schnittansicht des in der Figur 8 gezeigten Ausschnitts entlang der Schnittlinie B-B aus der Figur 8;

Figur 10

schematisch eine zu der in Figur 8 gezeigten Variante alternative und bevorzugte Möglichkeit zur Fixierung des Wuchtgewichtelements;

Figur 11

schematisch eine Ansicht einer anderen Turbinenlaufschaufel mit einer in einem oberen Bereich der Rückseite bzw. Stirnseite des Schaufelfußes angeordneten Wuchtgewicht-Aufnahmeeinrichtung in Gestalt einer Wuchtgewicht-Aufnahmebohrung;

Figur 12

schematisch eine Ansicht einer anderen alternativen Turbinenlaufschaufel mit einer an der Rückseite bzw. Stirnseite, aber außerhalb des Schaufelfußes angeordneten Wuchtgewicht-Aufnahmeeinrichtung in Gestalt einer schräg verlaufenden Wuchtgewicht-Aufnahmebohrung;

Figur 13

schematisch eine Ansicht einer wahlweisen Turbinenschaufel mit einer von der Bodenseite des Schaufelfußes zugänglichen Wuchtgewicht-Aufnahmeeinrichtung; und

Figur 14

schematisch eine um 90° gedrehte Ansicht der in der Figur 14 gezeigten Turbinenschaufel.

In the drawing show:

FIG. 1

1 schematically shows a view of a first turbine blade with a balancing weight receiving device arranged on the blade root and accessible from the bottom side of the blade root;

FIG. 2

3 is a schematic plan view of four balance weight elements arranged in a turbine blade and imbalance-generating means in a turbine wheel disk in the form of three unbalance holes with respect to a fictitious arrangement of a turbine shaft arranged thereon Turbine wheel disk and turbine blades supported thereon;

FIG. 3

schematically a view of another turbine blade with a arranged at the back or end face of the blade root balancing weight-receiving device;

FIG. 4

1 schematically shows a view of an alternative turbine blade with a balance weight pick-up device arranged at the rear or end side, but outside the blade root;

FIG. 5

2 is a schematic view of a blade root of a turbine blade provided with a balance weight receiving groove;

FIG. 6

schematically a rotated by 90 ° view of the in FIG. 5 shown blade root;

FIG. 7

schematically a perspective view of a in the in the FIGS. 5 and 6 and 8 and 9 shown balance weight-receiving groove einsteckbaren Wuchtgewichtelements;

FIG. 8

schematically a section of an assembly view with Erten held in a turbine wheel turbine blades from the FIGS. 5 and 6 ;

FIG. 9

schematically a sectional view of the in the FIG. 8 shown section along the section line BB from the FIG. 8 ;

FIG. 10

schematically one to the in FIG. 8 variant shown alternative and preferred way to fix the balancing weight element;

FIG. 11

1 schematically shows a view of another turbine blade with a balancing weight receiving device arranged in an upper region of the rear side or end face of the blade root in the form of a balancing weight receiving bore;

FIG. 12

FIG. 2 is a schematic view of another alternative turbine blade having a balance weight-receiving device in the form of an inclined balancing weight-receiving bore arranged on the rear or end side, but outside the blade root; FIG.

FIG. 13

schematically a view of an optional turbine blade with an accessible from the bottom side of the blade root balance weight pickup device; and

FIG. 14

schematically a rotated by 90 ° view of the in the FIG. 14 shown turbine blade.

The in the FIG. 1 The first turbine blade 1 shown essentially comprises an airfoil 2 and a blade root 3, wherein a blade platform 4 is arranged between the latter and the airfoil 2.

In the blade platform 4 is provided on its underside 5, which faces the blade root 3, a Einstecknut 6 for insertion of a sealing member not shown here.

The airfoil 2 extends in the direction along the longitudinal extent 7 of the turbine blade 1, starting from the blade platform 4 to its blade tip 8.

The blade root 3 is also arranged on the underside 5 of the blade platform 4 and serves for attachment a turbine wheel 10 (see, by way of example FIG. 2 ) of a turbine rotor 11, wherein the turbine wheel 10 in turn sits on a turbine shaft 12 of the turbine rotor 11.

According to the invention, in the FIG. 1 shown turbine blade 1 at its blade root 3 on a balance weight receiving device 13, in which at least one balance weight element 14 can be supported on the turbine blade 1 in order to equalize caused by the turbine 10 and / or turbine shaft 12 imbalance can.

The balancing weight-receiving device 13 is configured in this first embodiment as a balance weight-receiving groove 15, in which the complementary balance weight element 14 can be inserted and held.

This balance weight-receiving groove 15 is at least centrally introduced in this embodiment, the center line 16 of the turbine blade 1 in the blade root 3.

The balancing weight-receiving device 13 or the balancing weight-receiving groove 15 is accessible from the bottom side 17 of the blade root 3, so that the balancing weight element 14 in accordance with the direction 18, which is substantially aligned with the longitudinal extent 7 of the turbine blade 1, in the balancing weight Receiving groove 15 can be introduced.

The balancing weight-receiving groove 15 is closed at the bottom side 17, as soon as the turbine blade 1 in a corresponding not here Turbinenfuß recording (339, but see FIG. 8 ) is inserted at the turbine wheel 10.

As according to the to the FIG. 1 corresponding in the FIG. 2 abstracted shown arrangement 20, which from the about the rotation axis 21 rotating turbine shaft 12 (tie rod), from the attached to the turbine shaft 12 turbine wheel 10 and the thereto in each case in a Turbinenfuß recording (339, see FIG. 8 ) supported turbine blades 1 (see FIG. 1 ), it can be seen, in the turbine wheel 10 at least in this embodiment, for example, three unbalance holes 22 (only exemplified numbered) introduced, said three unbalance holes 22 means 23 for targeted generation formulate an imbalance on the embodied by the schematically illustrated arrangement 20 turbine rotor 11 , Instead of the unbalance bores 22, other recesses or accumulations of material of any kind can also be used to produce a corresponding imbalance.

Tuned to these three unbalance bores 22 are - relative to the axis of rotation 21 - radially 24 further outwardly by way of example four circumferentially 25 juxtaposed balancing weight elements 14 disposed within one of the turbine blades 1. Preferably, all turbine blades 1 include receiving possibilities for such balancing weight elements 14.

According to the in the FIG. 2 arranged abstractly illustrated arrangement 20 is each of the example shown balancing weight elements 14 (only exemplified) in a along the rotation axis 21 extending own balancing plane 26 (shown by way of example) is arranged, in which this respective balancing plane 26 in this embodiment by the rotation axis 21 and through the respective balancing weight element 14 arranged on the turbine blade 1 runs, the respective balancing weight element 14 being arranged in the balancing weight receiving groove 15 in the blade root 3.

In this respect, each of these balancing planes 26 also extends through the blade root 3 of the turbine blade 1.

In addition, the balancing weight elements 14 are arranged in a concentric about the rotation axis 21 extending curved balancing plane 30, wherein the curved balancing plane 30 extends through the blade root 3 of the arranged on the turbine wheel 10 turbine blades 1.

In any case, the turbine wheel 10 is modified by the introduction of cavities, such as the three unbalance holes 22, such that an imbalance caused thereby on the assembly 20 and the respective turbine rotor 11 by one or more correspondingly by the four balancing weight elements 14 modified turbine blade. 1 is compensated. In this respect, a homogeneous weight distribution is obtained on the arrangement 20 overall, so that the arrangement 20 has no appreciable imbalance. Thus, easily "detuned" turbine rotors 11 extremely easy to be balanced.

It is clear that the number of points at which means 23 are provided for the targeted generation of an imbalance, can be varied, so that in particular each turbine wheel 10 can inherit its own defined balancing character. In accordance with this balancing character, turbine rotor blades 1 equipped with balancing weight elements 14 can be arranged on the turbine wheel disk 10.

When in the FIG. 3 As shown alternative turbine blade 101 is also a balance weight receiving device 113 on the blade root 103 is present. While at the in the FIG. 1 However, the balancing weight-receiving groove 15 of the balancing weight-receiving device 13 is still placed centrally of the center line 16, the balancing weight-receiving groove 115 of the balancing weight-receiving device 113 is displaced into the region of the back 135 and one of the end sides of the blade root 103, namely, the balance weight-receiving groove 115 is located at the rear 135 within the blade root 103. The balance weight-receiving groove 115 extends in the circumferential direction 25th (please refer FIG. 2 ) of a turbine wheel disc not shown here (but see FIG. 2 ), so that a balance weight element (not shown) inserted therein can be displaced in this circumferential direction 25 in order to be able to be placed correspondingly for precise balancing.

When in the FIG. 4 shown further turbine blade 201, the balancing weight-receiving device 213 is also placed on the back 235 of the blade root 203, wherein the balancing weight-receiving groove 215 of the balancing weight-receiving device 213, however, is not located within the blade root 203, but is externally attached to the back 235.

In this respect, the balance weight receiving device 213 is axially in the direction of the axis of rotation 21 (see. FIG. 2 ) withdrawn from the turbine blade 201, but nevertheless arranged on the blade root 203.

In addition, this makes it possible in a structurally simple manner that a force flow within the blade root 203 is not disturbed or interrupted by the balancing weight receiving groove 215.

The balance weight-receiving device 213 has to realize the balance located outside the blade root 203 balance weight groove 21 two substantially mutually parallel and engageable by a balancing weight element groove webs 236 and 237 which limit the balance weight-receiving groove 215 above and below.

In the in the FIGS. 5 to 9 The blade root 303 of the turbine blade 301 illustrated there has a fir tree-shaped base body 338, wherein the balancing weight-receiving groove 315 of the balancing weight receiving device 313 incorporated in the blade root 303 again in the circumferential direction 325 in FIG FIG. 8 shown Turbinenradscheibe 310 runs.

In this balance weight-receiving groove 315 can in the FIG. 7 shown balancing weight element 314 are inserted before the respective turbine blade 302 is inserted into a provided for this purpose on the turbine wheel 310 Turbinenfuß recording 339.

As shown by the FIG. 8 It will be appreciated that the balancing weight member 314 exemplarily inserted in the balance weight receiving groove 315 of the left turbine blade 302 is supported centered by the opposed side walls 340 and 341 of the turbine cup holder 339.

In this respect, the balance weight element 314 is secured during insertion of the respective turbine blade 302 into the associated turbine base receptacle 339 in the balancing weight receiving groove 315.

As the presentation after the FIG. 10 shows well, may be provided by the turbine wheel 310 and the turbine blades 301 fixed thereto a circumferentially encircling annular groove 342 so that the inserted therein balancing weight element 314 is stored both partially in the foot body 338 and partially in the turbine wheel 310, whereby a free positioning of the balance weight element 314 can be realized on the entire circumference. It is understood that the balance weight element 314 is fixed in its position by appropriately designed fixing means (not shown).

When in the FIG. 11 shown turbine blade 401 is on the blade root 403 a balance weight receiving device 413 in the form of a balance weight receiving bore 450 for receiving the at least one balancing weight member 451 available, wherein the balancing weight receiving bore 450 is aligned in the direction of the longitudinal extent 407 of the turbine blade 401.

In this case, the balancing weight receiving bore 450 is accessible from the direction of the blade platform 404, so that the balancing weight element 451 can be inserted from above into the balancing weight receiving bore 450 in a preassembled state of the turbine blade 401 or removed therefrom.

In this exemplary embodiment, the balancing weight receiving bore 450 still has an enlarged mounting depression 452 so that the balancing weight element 451 can be more easily inserted into the balancing weight receiving bore 450.

The balance weight element 451 is also secured in this embodiment with proper assembly of the turbine blade 401 itself.

It is understood that, as seen in the circumferential direction of a turbine wheel a plurality of such balancing weight-receiving bores 450 may be arranged side by side.

To the flow of forces within the blade root 503 in the FIG. 12 The turbine blade 501 shown in FIG. 1 is not placed on the turbine blade 501, but it is placed on the rear side 535 outside the blade root 503.

The balancing weight-receiving device 513 is characterized by a marked on the back 535 material approach 553, in which the balancing weight-receiving bore 550 and the mounting sink 552 are introduced.

The in the FIGS. 13 and 14 shown turbine blade 601 has a blade root 603 with a top side arranged a Einstecknut 606 having blade platform 604, from which extends an airfoil 602 of the turbine blade 601 upwards.

In the blade root 603, a balancing weight-receiving device 613 is also arranged, wherein the balancing weight-receiving device 613 is accessible from the bottom side 617 of the blade root 603 in this embodiment.

The balancing weight receiving device 613 in this case comprises at least one balancing weight receiving bore 650 which extends radially to the axis of rotation (not shown) of a turbine (not shown). In this respect, the at least one balance weight receiving bore 650 extends in the direction of the longitudinal extent of the blade 602.

In order for the balancing weight or weights to be inserted or inserted from the bottom side 617 in the balancing weight receiving device 613, the turbine blade 601 must be taken out of its turbine base receptacle (not shown) of a turbine wheel disc (not shown).

In the properly and fully assembled condition, the at least one balance weight receiving bore 650 is closed by the turbine wheel disk so that a balance weight member (not shown) can not be lost. During operation of the turbine, this balancing weight element is additionally pressed into the blade root 603 in the direction of the blade 602 by the then acting centrifugal forces.

Alternatively, the respective balancing weight element or also an additional balancing weight element (also not shown) can also be introduced from the front side 660, which is opposite the rear side 635, into the blade root 603 through an additional mounting hole 661 of the balancing weight receiving device 613 , For this purpose, only an unillustrated blade securing plate, which is held in the Einstecknut 606 and in a lower Einstecknut 662, to be dismantled.

On the other hand, if this blade securing plate is properly inserted into the insertion grooves 606 and 662, it additionally serves to its retention of the blade root 603 relative to the Turbinenfuß recording at least with respect to this additional balancing weight element as captive, so that the additional balancing weight element from the additional mounting hole 661 can not fall out.

Although the invention has been further illustrated and described in detail by the preferred embodiments, the invention is not limited by these disclosed embodiments, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

Claims (15)

A turbine blade (1; 101; 201; 301; 401; 501; 601) having an airfoil (2; 602) and a blade root (3; 103; 203; 303; 403; 503; 603) for locating on a turbine wheel disk (10; 310) of a turbine shaft (12),
wherein the turbine blade (1) includes balancing weight receiving means (13; 113; 213; 313; 413; 513; 613) for supporting at least one balancing weight member (14; 314; 451; 551) on the turbine blade (1; 101; 201; 301) 401, 501, 601). A turbine blade (1; 101; 201; 301; 401; 501; 601) according to claim 1,
at least one balance weight element (14, 314, 451; 551) is arranged, by means of which one of the turbine wheel disc (10; 310) and / or the turbine shaft (12) inherent imbalance can be equalized. A turbine blade (1; 101; 201; 301; 401; 501; 601) according to claim 1 or 2, characterized
wherein the balancing weight receiving means (13; 113; 213; 313; 413; 513; 613) is mounted on the blade root (3; 103; 203; 303; 403; 503; 603) of the turbine blade (1; 101; 201; 301; 401 501, 601) is arranged. A turbine blade (1; 101; 201; 301; 401; 501; 601) according to any one of claims 1 to 3,
wherein said balance weight receiving means (13; 113; 213; 313) has a balance weight receiving groove (15; 115; 215; 315) for receiving said at least one balance weight member (14; 314), said balance weight receiving groove (15; 115; 215; 315) is arranged transversely to the longitudinal extent (7; 407) of the blade (2). A turbine blade (1; 101; 201; 301; 401; 501; 601) according to any one of claims 1 to 4,
wherein said balance weight receiving means (413; 513; 613) has a balance weight receiving bore (450; 550; 650) for receiving said at least one balance weight member (451; 551), said balance weight receiving bore (450; 550; 650) being directed toward the longitudinal extent (7; 407) of the airfoil (2) is arranged. A turbine blade (1; 101; 201; 301; 401; 501; 601) according to claim 4 or 5, characterized
wherein the balance weight receiving groove (15; 115; 215; 315) and / or the balance weight receiving bore (450; 550) are disposed within the blade root (3; 103; 203; 303; 403; 503; 603). A turbine blade (1; 101; 201; 301; 401; 501; 601) according to any one of claims 4 to 6,
wherein the balance weight receiving groove (215) or the balance weight receiving bore (550) is disposed on the outside of the blade root (203; 503). A turbine blade (1; 101; 201; 301; 401; 501; 601) according to any one of claims 5 to 7,
wherein the balance weight receiving bore (450; 550) is accessible from the direction of the airfoil (2). A turbine blade (1; 101; 201; 301; 401; 501; 601) according to any one of claims 5 to 8,
wherein a plurality of balancing weight receiving bores (450; 550; 650) are juxtaposed in the circumferential direction (25; 325) of the turbine wheel disc (10; 310). Arrangement (20) from a turbine shaft (12) of a turbine, in particular a gas turbine, rotatable about a rotation axis (21),
from a turbine wheel disc (10, 310) arranged on this turbine shaft (12),
from a plurality of turbine blades (1; 101; 201; 301; 401; 501; 601) arranged on the turbine wheel disc (10; 310),
and at least one balance weight member (14; 314; 451; 551) for equalizing an imbalance caused by the turbine shaft (12) and / or the turbine wheel disc (10; 310), wherein the at least one balance weight member (14; 314; 451; 551) is arranged in a balancing plane (26) extending along the axis of rotation (21),
said balancing plane (26) passing through said rotational axis (21) and through a balance weight receiving means (13; 113; 213; 313; 413; 513; 601) disposed on a turbine blade (1; 101; 201; 301; 401; 501; 601). 613). Arrangement (20) according to claim 10,
wherein the balancing plane (26) extending along the axis of rotation (21) extends through a blade root (3; 103; 203; 303; 403; 503; 603) of a turbine blade (1; 101; 201; 301; 401; 501; 601) , Arrangement (20) according to claim 10 or 11,
wherein the at least one balance weight element (14; 314; 451; 551) is disposed in a curved balancing plane (30) concentric with the axis of rotation (21), and wherein the curved balancing plane (30) is defined by a blade root (3; 103; 203; 303; 403; 503; 603) of the turbine blades (1; 101; 201; 301; 401; 501; 601) arranged on the turbine wheel disc (10; 310). Arrangement (20) according to claim 10 to 12,
wherein a material recess and / or material accumulation arranged on the turbine wheel disk (10; 310) and / or on the turbine shaft (12) for generating an imbalance on the turbine wheel disk (10; 310) and / or on the turbine shaft (12) on the turbine wheel disk (10; 310) and / or on the turbine shaft (12) are configured such that this unbalance is coupled to at least one balancing weight element (14; 314; 451; 601; 601) arranged on the turbine blade (1; 101; 201; 301; 401; 501; 601). 551) can be leveled. Arrangement (20) according to one of claims 10 to 13,
wherein the assembly (20) comprises at least one turbine blade (1; 101; 201; 301; 401; 501; 601) according to any one of claims 1 to 9. Turbine,
in particular gas turbine,
with a plurality of turbine blades (1; 101; 201; 301; 401; 501; 601),
wherein the turbine comprises at least one turbine blade (1; 101; 201; 301; 401; 501; 601) according to any one of claims 1 to 9 or an assembly (20) according to any one of claims 10 to 14.

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