EP3019706B1 - Assembly for securing a function position of a side plate on a rotor disk arranged relative to a rotor blade assembled on the rotor disk - Google Patents

Description

The invention relates to an arrangement for securing a functional position of a arranged on an outer circumference of a rotor of a rotor of a gas turbine cover plate of the rotor relative to a arranged on the outer circumference of the rotor disk rotor blade, wherein between the cover plate located in its functional position and one of the cover plate side facing a blade root of the blade, a channel portion of an annular cooling channel of the rotor is formed.

The invention further relates to a rotor assembly of a rotor of a gas turbine, comprising a rotor disk, a rotor blade arranged on the outer circumference of the rotor disk, a cover plate ring arranged on the outer circumference of the rotor disk.

Furthermore, the invention relates to a rotor for a gas turbine and a gas turbine.

An arrangement of the type mentioned is, for example, from the publication WO 2010/094539 A1 known. EP 1 944 471 A1 discloses the technical features of the preamble of claim 1. In order to secure a functional position of a arranged on an outer circumference of a rotor of a rotor of a gas turbine cover plate of the rotor relative to a arranged on the outer circumference of the rotor disc rotor blade, this publication proposes a blocking element in insert an opening formed on the cover plate keyhole-like, which engages in its functional position in a arranged on one of the cover plate side of a blade root of the blade arranged hole. This functional position of the blocking element is ensured that the blocking element engages in a certain rotational position relative to the cover plate the edge of the opening blade end side by means of a cam formed on the blocking element and that the blocking element located in this rotational position is secured against rotation relative to the cover plate about a longitudinal axis of the blocking element. Securing the rotational position of the blocking element is achieved in that a part of the blocking element is plastically deformed and thereby engages in a beard opening of the keyhole-like opening. The object of the invention is to provide a novel and easy way to secure functional positions of arranged on an outer circumference of a rotor of a rotor of a gas turbine cover plates of the rotor relative to arranged on the outer circumference of the rotor disc rotor blades of the rotor.

The arrangement according to the invention for securing a functional position of a cover plate of the rotor arranged on an outer circumference of a rotor disk of a rotor of a gas turbine relative to a rotor blade arranged on the outer circumference of the rotor disk is described in claim 1.

According to the invention, the functional position of the cover plate is secured when the securing bolt extends partially in the formable on the guide portion of the cover plate guide opening and the web is at least partially disposed in the recesses. This is effected in particular by the fact that the web extends radially with respect to the rotor disk when the rotor blade is arranged on the rotor disk.

The thickening formed on the cover plate or the guide section which can be formed thereby enables the formation of a longer guide opening and thus a good guidance of the securing bolt. In addition, due to the thickening or the guide section, forces occurring during operation of a correspondingly formed gas turbine can be better absorbed by the cover plate due to the contact with the securing bolt in the region of the guide opening, without damaging the cover plate, in particular in the region of the guide opening. comes. Preferably, the guide portion completely surrounds the guide opening.

The fact that the outer diameter of the securing bolt corresponds to the diameter of the guide opening is intended to mean that the securing bolt can be inserted in a form-fitting manner into the guide opening.

The open towards the end of the locking bolt training and diametrical arrangement of the recesses allows simultaneous insertion of the web in the two recesses by the locking pin is placed on the bridge. In order to achieve positive connections between the recesses and the web, the width of the recesses is preferably equal to the width of the web.

The safety device for securing a functional position of the safety bolt on the cover plate and the blade keeps the safety pin permanently secure in its plugged onto the web position, d. H. in its functional position. The securing device may be designed in any manner suitable for this purpose.

The inventive arrangement can be realized in the course of retrofitting an existing gas turbine. In addition, the arrangement can already be taken into account in a new development of gas turbines. With the arrangement according to the invention various types of gas turbines can be equipped. Preferably, an arrangement according to the invention is provided for each cover plate of a rotor.

The securing bolt and / or the web are formed of metal and may be hardened to reduce wear on these components in a suitable manner.

The securing device preferably comprises a groove arranged on the side of the guide section facing the blade root, which extends radially from the guide opening over at least part of the guide section, and an L-shaped, plastically deformable securing wire, wherein the diameter of the longitudinal bore of the securing bolt Width of the groove and the width of the recesses are greater than or equal to the outer diameter of the safety wire. One leg of the L-shaped safety wire can thus be arranged in the longitudinal bore of the partially in the guide opening on the cover plate Fuse bolt are introduced until the other leg of the fuse wire is at least partially in the groove formed on the guide portion. If the leg of the safety wire arranged at least partially in the groove extends simultaneously through one of the recesses on the safety pin, the safety pin is secured relative to the cover plate against rotation about its longitudinal axis. In order to achieve optimum robustness of the arrangement, the diameter of the longitudinal bore, the width of the groove and the width of the recesses are preferably equal to the outer diameter of the safety wire, so that appropriate form fit between components of the assembly can be produced.

A recess is preferably formed by a predetermined length difference longer than the other recess, wherein the difference in length is greater than or equal to the outer diameter of the safety wire. Preferably, the difference in length is equal to the outer diameter of the safety wire. The length of the shorter recess may, for example, correspond to the height of the web, whereas the length of the longer recess may correspond to the sum of the height of the web and the outside diameter of the safety wire. To simplify the production costs associated with the securing bolt, the recesses may alternatively be designed to be of equal length.

The web is preferably formed monolithically with the blade. The web, for example, can be produced inexpensively together with the remaining blade in a casting process. As a result, a very robust connection between the web and the remaining blade is created. Alternatively, the web can be made separately and then connected to the blade.

Preferably, the web can be arranged on a recess which can be formed on the side of the blade root facing the cover plate. As a result, axial space can be saved to despite the attachment of an inventive arrangement on a rotor of a gas turbine to allow a compact design of the rotor or the gas turbine.

At least one longitudinal edge of the web arranged on the side of the web remote from the blade root is preferably provided with a chamfer. The chamfer can be formed by a mechanical reworking of the web formed on the blade. Preferably, both are provided on the side remote from the blade root of the web arranged longitudinal edges of the web, each with a chamfer. The formation of the chamfer or chamfers on the web allows for easier assembly of the arrangement, which is particularly difficult because the web is hardly or not visible during assembly of the arrangement. Due to the chamfer or bevels on the web, contact between the securing bolt or the edges of the recesses formed on the securing bolt and the web can lead to a desired positive orientation of the securing bolt relative to the web, as desired on the web attach or transfer the safety pin in its functional position.

The not provided with the recesses end of the securing bolt is preferably provided on a side facing the longitudinal bore with a at least over a part of the inner circumference of the longitudinal bore extending rounding. The rounding can serve as a contact surface for a plastic deformation of the safety wire in order to bend a blade end remote from the safety pin end of the safety wire, preferably by 90 °. This plastic deformation of the safety wire can be used to keep the safety pin permanently in its functional position. Without the rounding at the end of the securing bolt, damage to the securing wire could occur during bending of the safety wire and / or under mechanical stress during operation of a correspondingly formed gas turbine. This could in turn the durability of a corresponding fuse the functional position of the locking bolt are affected.

Preferably, at least one free end of at least one recess is provided with a chamfer. The chamfer can be formed by a mechanical reworking of the free end of the recess. Preferably, both free ends of each recess are each provided with a chamfer. The formation of the chamfer or chamfers on the recess or the recesses also allows a simpler installation of the arrangement, which is particularly difficult because the web is hardly or not visible during assembly of the arrangement. Due to the chamfers at the free ends of the recesses, it can come to a desired positive orientation of the securing bolt relative to the web at a contact between the safety pin or the chamfer formed on the chamfer and the web on which also chamfers may be formed attach the safety pin to the bridge as desired or to transfer the safety pin to its functional position.

The arrangement preferably comprises a sealing groove, which can be arranged on the blade side on a sealing wing formed on a platform of the blade, in which a radially outer edge section of the cover plate can be arranged. When properly mounted on a rotor assembly, the radially outer edge portion of the cover plate is inserted into a part of the sealing groove. During operation of a correspondingly equipped gas turbine, the cover plate can move radially outward and dip further into the sealing groove. The farther the radially outer edge portion of the cover plate is immersed in the sealing groove, the better the cover plate is sealed against the sealing wing, which is accompanied by an improvement in the sealing of a formed between the cover plates and the blade roots, annular cooling channel of the rotor. In addition, during operation of a gas turbine, tilting movements of the platforms of the rotor blades and thereby the sealing blade of the rotor blades generally occur. Due to the in the sealing groove existing game and the selective suspension of the cover plate on the safety bolt on the rotor, a cover plate can rotate about the safety pin to a certain extent in order to follow the tilting movements of the platforms to a certain extent.

The rotor assembly according to the invention for a rotor of a gas turbine comprises a rotor disk, a rotor blade arranged on the outer circumference of the rotor disk, a cover plate ring arranged on the outer circumference of the rotor disk and at least one arrangement according to one of the aforementioned embodiments or any combination thereof. Hereby, the advantages mentioned above with respect to the arrangement are connected accordingly.

The rotor according to the invention for a gas turbine comprises at least one aforementioned rotor assembly.

The gas turbine according to the invention comprises an aforementioned rotor.

FIG 1

einen Ausschnitt einer Seitenansicht eines Ausführungsbeispiels für eine erfindungsgemäße Laufschaufel,

FIG 2

einen Ausschnitt einer Schnittdarstellung der in Figur 1 gezeigten Laufschaufel,

FIG 3

eine perspektivische Darstellung eines Ausführungsbeispiels für einen Sicherungsbolzen einer erfindungsgemäßen Anordnung,

FIG 4

einen Längsschnitt durch den in Figur 3 gezeigten Sicherungsbolzen,

FIG 5

eine Stirnansicht des in Figur 3 gezeigten Sicherungsbolzens,

FIG 6

eine Seitenansicht eines Ausführungsbeispiels für einen Sicherungsdraht der erfindungsgemäßen Anordnung,

FIG 7

einen Ausschnitt einer Seitenansicht eines Ausführungsbeispiels für eine erfindungsgemäße Deckplatte,

FIG 8

einen Ausschnitt eines Längsschnitts durch die in Figur 7 gezeigte Deckplatte,

FIG 9

einen Ausschnitt einer Schnittdarstellung eines Ausführungsbeispiels einer erfindungsgemäßen Anordnung in ihrer Funktionsstellung.

In the following, a preferred embodiment of the arrangement according to the invention will be explained with reference to the accompanying schematic drawings. It shows:

FIG. 1

a detail of a side view of an embodiment of a blade according to the invention,

FIG. 2

a section of a sectional view of in FIG. 1 shown blade,

FIG. 3

a perspective view of an embodiment of a safety bolt of an inventive arrangement,

FIG. 4

a longitudinal section through the in FIG. 3 shown safety bolts,

FIG. 5

an end view of the in FIG. 3 shown locking bolt,

FIG. 6

a side view of an embodiment of a fuse wire of the inventive arrangement,

FIG. 7

a detail of a side view of an embodiment of a cover plate according to the invention,

FIG. 8

a section of a longitudinal section through the in FIG. 7 shown cover plate,

FIG. 9

a section of a sectional view of an embodiment of an inventive arrangement in its functional position.

FIG. 1 shows a section of a side view of an embodiment of a blade 1 according to the invention, ie, a blade 1, which at the one in the FIGS. 7, 8 and 9 shown cover plate 2 facing side 3 of the blade root 4 of the blade 1 arranged web 5, which is arranged on the blade root 4, that the web 5 extends radially arranged at a not shown rotor disc rotor blade 1 with respect to the rotor. The web 5 is arranged on a side facing the cover plate 2 side 3 of the blade root 4 recess 6, which is the Figures 2 and 9 can be better seen. The web 5 is formed monolithically with the blade 1, wherein the two on the side facing away from the blade root 4 of the web 5 longitudinal edges of the web 5 are each provided with a chamfer 9. Above the recess 6, a sealing wing 7 of a platform 8 of the blade 1 is arranged.

FIG. 2 shows a section of a sectional view of in FIG. 1 shown blade 1 according to the in FIG. 1 shown arrow A. On the sealing wing 7 of the platform 8 of the blade 1 is on the blade root side a sealing groove 10 is formed, in which a radially outer edge portion of the cover plate 2 can be arranged, as in FIG. 9 is shown. The web 5 is flush with the rest of the cover plate 2 facing side 3 of the blade root 4 from, ie, that the height h of the web 5 corresponds to the depth of the recess 6.

FIG. 3 shows a perspective view of an embodiment of a securing bolt 11 of an inventive arrangement 12, as shown in FIG. 9 is shown. The securing bolt 11 has a continuous longitudinal bore 13 and at one end two recesses 14 and 15, which are arranged diametrically opposite one another and are open towards this end. The recesses 14 and 15 extend from this end of the securing bolt 11 parallel to the longitudinal axis L of the securing bolt 11 over part of the length of the securing bolt 11. The width b _{A of} the recesses and the diameter d _{L of} the longitudinal bore 13 are equal to the width b _S of Stegs 5. The free ends of the recesses 14 and 15 are each provided with a chamfer 16. The not provided with the recesses 14 and 15 end of the securing bolt 11 is provided on one of the longitudinal bore 13 facing side with a over the entire inner circumference of the longitudinal bore 13 extending rounding 17, which is better FIG. 4 can be removed.

FIG. 4 shows a longitudinal section through the in FIG. 3 The recess 14 is formed by a predetermined length difference .DELTA.l = l ₂ -l ₁ longer than the recess 15. The length l _{1 of} the shorter recess 14 is equal to the height h of the web 5. The difference in length .DELTA.l, the width b _{A of} the recesses 14 and 15, the width b _{S of} the web 5 are equal to the diameter d of the longitudinal bore thirteenth

FIG. 5 shows an end view of the in the FIGS. 3 and 4 shown securing bolt 11 according to the arrow B from FIG. 4 ,

FIG. 6 shows a side view of an embodiment of a fuse wire 18 of the inventive arrangement 12. The plastically deformable fuse wire 18 is L-shaped and has a shorter leg 19 and a longer leg 20. The fuse wire 18 has a circular cross-section and is formed of metal. The fuse wire 18 forms part of a securing device for securing the in FIG. 9 shown functional position of the securing bolt 11 on the cover plate 2 and the blade 1. The length l _{2 of} the longer recess 15 is equal to the sum of the height h of the web 5 and the outer diameter d _{a of} the fuse wire. The diameter d _{L of} the longitudinal bore 13, the difference in length Δl, the width b _{A of} the recesses 14 and 15 and the width b _{S of} the web 5 are equal to the outer diameter d _{a of} the safety wire 18th

FIG. 7 shows a section of a side view of an embodiment of a cover plate 2 according to the invention on the cover plate 2 is formed by a formed on the cover plate 2 thickening 21 guide portion 22 and formed by a arranged on the cover plate 2 through hole 23 guide opening 24, wherein the guide portion 22 completely surrounds the guide opening 24. The securing device comprises a groove 26 arranged on the side 25 of the guide section 22 facing the blade root 4, which groove extends radially from the guide opening 24 over the guide section 22. The width b _{N of} the groove 26 is equal to the outer diameter d _{a of} the safety wire 18. The outer diameter d _{S of} the securing bolt 11 is equal to the diameter d _{F of} the guide opening 24th

FIG. 8 shows a section of a longitudinal section through the in FIG. 7 shown cover plate 2 according to the line CC FIG. 7 ,

FIG. 9 shows a section of a sectional view of an embodiment of an inventive arrangement 12 for securing the shown functional position of arranged on an outer periphery of a rotor of a rotor of a gas turbine cover plate 2 of the rotor relative to the arranged on the outer circumference of the rotor disc rotor blade 1 of the rotor. Between the cover plate 2 located in its functional position and the cover plate 2 facing side 3 of a blade root 4 of the blade 1, a channel portion 27 of a not shown, annular cooling channel of the rotor is formed.

The following is the assembly of in FIG. 9 shown arrangement 12 described in more detail:
First, the fuse wire 18 can be pre-assembled in the securing bolt 11 by the longer leg 20 of the fuse wire 18 is inserted into the longitudinal bore 13 of the securing bolt 11 until the shorter leg 19 of the fuse wire 18 engages in the longer recess 15 of the securing bolt 11. The thus preassembled module can be pushed by the blade root 4 facing side 25 of the guide portion 22 in the guide opening 24 until the shorter leg 19 of the fuse wire 18 is at least partially disposed in the groove 26. As a result, the fuse wire 18 is secured against axial rotation. The cover plate 2 can then be positioned together with the assembly of securing wire 18 and securing bolt 11 arranged thereon in a functional position relative to the moving blade 1 or its blade root 4. Then, the securing bolt 11 can be pressed and displaced axially from the side of the cover plate 2 facing away from the blade root 4 in the direction of the blade root 4, so that the web 5 engages in the recesses 14 and 15 on the securing bolt 11. Finally, the protruding from the securing bolt 11 end of the longer leg 20 of the fuse wire 18 radially over the trained on the safety pin 11 Rounding 17 to be bent outward as it is in FIG. 5 is shown. This prevents that the securing bolt 11 can move axially away from the blade root 4.

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

Claims (11)

1. Arrangement (12) for securing a functional position of a shroud plate (2) of a rotor of a gas turbine, which shroud plate (2) is arranged on an outer circumference of a rotor disc of the rotor, relative to a moving blade (1) of the rotor arranged on the outer circumference of the rotor disc, wherein a channel portion (27) of an annular cooling channel of the rotor is formed between the shroud plate (2) located in its functional position and a side (3), facing the shroud plate (2), of a blade root (4) of the moving blade (1), comprising

   - a guide portion (22), which may be formed by a thickened portion (21) formed on the shroud plate (2), and a guide opening (24), which may be formed by a through-hole (23) arranged on the shroud plate (2), wherein the guide portion (22) at least partially surrounds the guide opening (24),

   - a securing bolt (11), the external diameter (d_S) of which corresponds to the diameter (d_F) of the guide opening (24), a securing device for securing a functional position of the securing bolt (11) on the shroud plate (2) and the moving blade (1),

   characterized by
   a web (5) which is arranged in one piece on the moving blade (1) on the side (3) of the blade root (4) facing the shroud plate (2), which (5) extends radially relative to the rotor disc when the moving blade (1) is arranged on the rotor disc, wherein the securing bolt (11) comprising a longitudinal through-hole (13) comprises at one end two cut-aways (14, 15) arranged diametrically relative to one another, open towards said end and of equal width, which cut-aways extend from said end of the securing bolt (11) parallel to the longitudinal axis (L) of the securing bolt (11) over part of the length of the securing bolt (11), wherein the width (b_A) of the cut-aways (14, 15) is greater than or equal to the width (b_S) of the web (5) .
2. Arrangement (12) according to Claim 1,
   wherein the securing device comprises a groove (26) which may be arranged on the side (25) of the guide portion (22) facing the blade root (4), which groove extends from the guide opening (24) radially over at least part of the guide portion (22), and an L-shaped, plastically deformable securing wire (18),
   wherein the internal diameter (d_L) of the longitudinal hole (13) and the width (b_N) of the groove (26) are greater than or equal to the external diameter (d_a) of the securing wire (18).
3. Arrangement (12) according to Claim 2,
   wherein one cut-away (15) is longer than the other cut-away (14) by a predetermined difference in length (Δl),
   wherein the difference in length (Δl) is greater than or equal to the external diameter (d_a) of the securing wire (18).
4. Arrangement (12) according to one of Claims 1 to 3,
   wherein the web (5) may be arranged in a recess (6) formed on the side (3) of the blade root (4) facing the shroud plate (2) .
5. Arrangement (12) according to one of Claims 1 to 4,
   wherein at least one longitudinal edge of the web (5) arranged on the side of the web (5) remote from the blade root (4) is provided with a chamfer (9).
6. Arrangement (12) according to one of Claims 1 to 5,
   wherein the end of the securing bolt (11) not provided with the cut-aways (14, 15) is provided, on a side facing the longitudinal hole (13), with a rounding (17) extending over at least part of the inner circumference of the longitudinal hole (13) .
7. Arrangement (12) according to one of Claims 1 to 6,
   wherein at least one free end of at least one cut-away (14, 15) is provided with a chamfer (16).
8. Arrangement (12) according to one of Claims 1 to 7,
   comprising a sealing groove (10) which may be arranged on the blade side on a sealing wing (7) formed on a platform (8) of the moving blade (1), in which sealing groove (10) a radially outer edge portion of the shroud plate (2) may be arranged.
9. Rotor assembly for a rotor of a gas turbine,
   comprising a rotor disc, a moving blade ring arranged on the outer circumference of the rotor disc, a shroud plate ring arranged on the outer circumference of the rotor disc and at least one arrangement (12) according to one of Claims 1 to 8.
10. Rotor for a gas turbine,
    comprising at least one rotor assembly according to Claim 9.
11. Gas turbine,
    comprising at least one rotor according to Claim 10.

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