EP3581765A1 - Rotor pourvu de pales tournantes verrouillées axialement sur le disque de rotor - Google Patents

Rotor pourvu de pales tournantes verrouillées axialement sur le disque de rotor Download PDF

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Publication number
EP3581765A1
EP3581765A1 EP18177021.5A EP18177021A EP3581765A1 EP 3581765 A1 EP3581765 A1 EP 3581765A1 EP 18177021 A EP18177021 A EP 18177021A EP 3581765 A1 EP3581765 A1 EP 3581765A1
Authority
EP
European Patent Office
Prior art keywords
fastening
securing element
rotor
shoulder
rotor according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18177021.5A
Other languages
German (de)
English (en)
Inventor
Jonathon Baker
Roger Matthews
Santiago R. Salazar
Peter Schröder
Andrew R. Waddell
Kevin KAMPKA
Vyacheslav Veitsman
Matthew Gent
Harald Hoell
Karsten Kolk
Peter Kury
Christopher W. Ross
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP18177021.5A priority Critical patent/EP3581765A1/fr
Publication of EP3581765A1 publication Critical patent/EP3581765A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
    • F01D5/3015—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type with side plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/326—Locking of axial insertion type blades by other means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position

Definitions

  • the invention relates to a rotor which has a rotor disk, on which a plurality of rotor blades are arranged distributed around the circumference, the rotor blades being fixed in the axial direction by means of securing elements.
  • Rotors of gas turbines generally have a plurality of rotor disks. Some of the rotor disks are provided with rotor blades that are distributed around the circumference.
  • Various solutions are used in the prior art to mount the rotor blades on the rotor disks, the rotor disks generally having approximately axially extending blade retaining grooves.
  • the individual rotor blades are each provided with a blade root which is received in the respective blade holding groove.
  • the invention can be used for rotors of different types. Their use in gas turbine rotors is particularly advantageous. Use in steam turbines, for example, is also possible without restriction.
  • the generic rotor has at least one rotor disk. There is a plurality of rotor blades distributed around the circumference of the rotor disk. To secure them, the rotor disk has a plurality of blade holding grooves distributed around the circumference, the rotor blades each having correspondingly complementary blade feet. How the blade-holding grooves and blade feet are designed is initially irrelevant, provided the safe load transfer, the centrifugal forces occurring during operation of the rotor from the rotor blades to the rotor disk is guaranteed.
  • the blade feet can be displaced along the blade holding grooves, a displacement in the axial direction being at least partially involved.
  • the blade holding grooves are designed in a straight line parallel to the rotor axis. An arrangement inclined to the rotor axis and / or an arcuate configuration of the blade holding grooves with an equally proportionate movement, for example in the circumferential direction, is irrelevant in this regard.
  • the rotor disk has a plurality of fastening projections which are arranged distributed around the circumference and which extend axially from one end face of the rotor disk.
  • the fastening projections are each arranged between adjacent blade holding grooves.
  • the generic embodiment of the rotor comprises a plurality of securing elements, by means of which one Axial fixation of the blade feet and thus the rotor blades takes place relative to the rotor disk.
  • the rotor blades are each provided with a fastening shoulder which extends axially from one end face.
  • the fastening shoulder When viewed in the axial direction, the fastening shoulder is in the same position as the fastening projection. Viewed in the circumferential direction, the fastening shoulder is alternately located next to the fastening projection, these being arranged at similar radial distances from the rotor axis.
  • the securing element is arranged in sections both in the fastening protrusion and in sections in the fastening shoulder, thereby axially fixing the blade root to the rotor disk.
  • the fastening projection is carried out in an advantageous embodiment in the circumferential direction up to the blade-holding grooves.
  • an advantageous engagement or inclusion of the securing element in the fastening shoulder is made possible by the execution of the fastening shoulder in the circumferential direction over the entire width of the blade root.
  • the fastening projection extends on both sides to the adjacent one Fixing shoulder. This advantageously prevents inadmissible bending stresses in the securing element.
  • the fastening shoulder on the blade root can be carried out both integrally and assembled.
  • the integral embodiment enables stability without a tolerance problem when arranging an assembled component.
  • the connector is received in batches in the blade holding groove.
  • at least an axial fixation of the connecting piece directly on the blade root is required.
  • the blade root on the side facing the rotor axis has an elevation or depression which extends in the circumferential direction and / or tangentially, and the connecting piece has a corresponding depression or elevation to complement this.
  • the securing element is received on the fastening shoulder or the fastening projection and in which way the securing element engages in the fastening projection or fastening shoulder is initially irrelevant. At least it is advantageous if a guide receptacle is present in the fastening projection. In contrast, an engagement receptacle is advantageously located on the fastening shoulder. It is necessary for the engagement receptacle to be aligned with the guide receptacle and for both to be open to one another. Accordingly, it is made possible for the securing element accommodated in the guide receptacle or in the engagement receptacle to engage in the engagement receptacle or in the guide receptacle.
  • the securing element is displaced in the circumferential direction and / or in the tangential direction for assembly. Accordingly, it is necessary that the guide receptacle and / or the engagement receptacle at least in sections extend in the circumferential direction and / or in the tangential direction.
  • fastening shoulder or the fastening projection ensure radial support of the securing element in the event of the centrifugal forces that occur.
  • the guide and / or intervention must be carried out accordingly.
  • a simple implementation of the guide receptacle is achieved if it is designed as an axially or radially open groove.
  • the groove can be undercut.
  • the engagement receptacle is achieved if it is designed as an axially or radially open groove. In order to secure the position in the groove, this groove can also be undercut. Likewise, when the securing element is arranged in the engagement receptacle, radial and axial fastening and accessibility for displacing the securing element are achieved, which in turn enables simple assembly.
  • a circumferential groove or a groove that is tangential in sections is first formed.
  • the securing element is essentially loaded with shear in the axial direction and the centrifugal force is otherwise to be taken into account
  • the accommodation of the securing element in the guide receptacle and / or the engagement receptacle is spaced apart from the separating surface between the fastening projection and the fastening shoulder of lesser importance.
  • the guide receptacle or the engagement receptacle can be designed to open axially and / or radially in sections.
  • the fastening projection therefore has a tool holder which interrupts the guide holder and provides a larger free space for a tool.
  • two tool holders can be provided on a fastening projection.
  • the guide holder is divided into separate sections by the tool holder.
  • the fastening shoulder has a recess which interrupts the engagement receptacle and provides a larger free space for a tool.
  • two recesses can be provided on a fastening projection.
  • the engagement receptacle is divided into separate sections by the recess.
  • the guide receptacle or the engagement receptacle has a circumferential closed shape, in particular in the area of the separating surface between the fastening projection and the fastening shoulder, and in this respect the securing element is accommodated in a pocket or bore.
  • the fastening projection is divided into individual sections along the guide receptacle or fastening shoulder along the engagement receptacle.
  • the fastening projection or fastening shoulder has gaps that interrupt the guide receptacle or the engaging receptacle, at least in sections.
  • the securing element can be arranged evenly distributed in the fastening projection and in the fastening shoulder, it is nevertheless advantageous if the securing element is essentially accommodated in one component and engages in the adjacent component. Accordingly, two different alternatives are available for implementation, in a first alternative the securing element being received on the fastening shoulder of the blade root and engaging at least on one side in an adjacent fastening projection. Conversely, the securing element is advantageously to be arranged on the fastening projection and an engagement in at least one adjacent fastening shoulder is to be provided. By including the securing element on the fastening shoulder or on the fastening projection, this is fixed in the axial and radial direction.
  • a particularly secure axial fixation of the rotor blades with the securing element is made possible if a securing element is provided on both sides of the blade retaining groove when the fastening projection and the fastening shoulder are separated is arranged.
  • the engagement of the securing element takes place on both sides, starting from the location, so that the securing element engages on both sides in an adjacent fastening projection or on both sides in an adjacent fastening shoulder.
  • an embodiment which is essentially symmetrical to the center of the blade retaining groove or to the center of the fastening shoulder and / or to the center between two blade retaining grooves or to the center of the fastening projection is selected.
  • the symmetrical design of the axial locking by means of the securing element or the securing elements leads to increased security against shearing off of a securing element under high axial loads.
  • a securing element can be used which, in a first alternative, is received on the fastening shoulder of the blade root and here engages at least on one side in an adjacent fastening projection.
  • a second alternative it is also possible in a second alternative to arrange the securing element on the fastening projection and to provide an engagement in at least one adjacent fastening shoulder.
  • the engagement of the securing element takes place on both sides, starting from the location, so that in the first alternative the securing element engages on both sides in an adjacent fastening projection and in the second alternative engages on both sides in an adjacent fastening shoulder.
  • an axial locking by means of the securing element is made possible which is essentially symmetrical to the center of the fastening shoulder and, in the second alternative, is essentially symmetrical to the center of the fastening projection. This leads to increased security against shearing off of the securing element in the case of impermissibly high axial loads.
  • the securing element advantageously runs along the guide receptacle and / or along the engagement receptacle and in this case engages in sections on both sides in the engagement receptacle or the guide receptacle. This symmetrical arrangement enables advantageous load transmission with simple assembly.
  • the securing element which extends in the circumferential direction and / or tangentially, furthermore advantageously has a rod shape, the two opposite ends of which are angled in the assembled position. This prevents the securing element from being displaced along its extent.
  • the angled ends of the securing element can be realized in different ways.
  • an angled second end of the securing element is realized by bending a previously straight section of the securing element after it has been positioned in the guide receptacle and / or engaging receptacle. It can be provided that the first end is also given an angled shape by bending. In contrast, however, it is advantageous if the securing element has an angled shape even before assembly at the first end.
  • the guide receptacle or the engagement receptacle is designed as an open groove and enables the securing element to be inserted.
  • a separate assembly opening can be provided in the guide receptacle or in the engagement receptacle.
  • an assembly opening is advantageously present in the fastening shoulder, which is sufficiently long in the circumferential direction or in the tangential direction to enable the securing element to be threaded into the guide receptacle and then the engagement receptacle.
  • an assembly opening is advantageously present in the fastening projection, which is sufficiently long in the circumferential direction in the tangential direction to thread the securing element into the engagement receptacle and then the guide receptacle to enable.
  • the assembly of the securing element is further advantageously simplified if the assembly opening has a greater length than the securing element before it was assembled. This enables the securing element to be attached before the moving blades are inserted into the assembly opening, the securing element being displaced into its receiving position on the guide receptacle after the moving blades have been inserted.
  • a second embodiment according to the invention comprises a right securing element and a left securing element adjacent in the circumferential direction. It is thereby achieved that on both sides a securing element on the separating surface creates an axial connection from the fastening projection to the fastening shoulder.
  • a right-hand securing element and a left-hand securing element are advantageously accommodated in a fastening projection, the securing elements engaging in opposite, adjacent fastening heels.
  • a right-hand securing element and a left-hand securing element are advantageously accommodated in a fastening shoulder, the securing elements engaging in opposing, adjacent fastening projections.
  • the respective securing element advantageously has at one end a locking device formed by an end section of the securing element, which engages in a correspondingly adjacent component (fastening projection or fastening shoulder).
  • a particularly advantageous assembly and simple securing of the securing element in the assembled position is achieved if the securing element has a bent section at the end opposite the locking device. It is provided that an end face of the bending section, when the securing element is in the installed position, bears against a block which prevents displacement of the securing element.
  • the particularly advantageous and simple assembly / disassembly is made possible by a particularly advantageous deformation of the bending sections, which can be arranged for assembly / disassembly to overlap for blocking.
  • the bending sections are arranged to overlap one another during assembly / disassembly.
  • a first exemplary embodiment for axially securing a moving blade 21 with the blade root 22 to a rotor disk 01 by means of a securing element 71 is outlined in a perspective view.
  • the rotor disk 04 here has a fastening projection 03 which extends axially from one end face and which is located in each case between the blade retaining grooves 02.
  • the respective fastening projection 03 forms a radially outwardly opening engagement receptacle 04 and at the same time an assembly opening.
  • the rotor blade with the blade root 22 used here analogously has a fastening shoulder 23 which extends axially from the front side. This extends over the width of the respective blade root 22 on both sides to the respectively adjacent fastening projections 03.
  • the fastening shoulder 23 has a guide receptacle 24 which opens radially to the rotor axis.
  • a securing element 71 is accommodated in this 24.
  • the guide receptacle 24, the engagement receptacle 04 with a mounting opening and the securing element 71 extend in the circumferential direction.
  • the two ends 72, 73 of the securing element 71 are each angled so that displacement in the circumferential direction is prevented.
  • the Fig. 3 once again outlines the exemplary embodiment in longitudinal section Figures 1 and 2 , again the rotor disk 01 with the blade holding groove 02 and the fastening projection 03 can be seen.
  • the fastening projection 03 there is the engagement receptacle 04 which extends in the circumferential direction and has a mounting opening.
  • the rotor blade with the blade root 22 has, on the fastening shoulder 23, the guide receptacle 24 which extends in the circumferential direction and which 24 in the assembled position of the securing element 71 is included.
  • the assembly of the securing element 71 after inserting the blade root 22 is shown schematically here.
  • the assembly opening 04 has a greater longitudinal extent than the guide receptacle 24. This makes it possible to insert the securing element 71 with an angled end 72 in the assembly opening 04, which is then inserted into the guide receptacle 24 with subsequent bending of the second end 73.
  • the rotor disk 01 is sketched again, wherein the fastening projection 03 with the engagement receptacle 04, which in this exemplary embodiment also forms the assembly opening, can advantageously be seen.
  • the Fig. 5 outlines the blade root 22 of the moving blade with the axially extending fastening shoulder 23 and the guide receptacle 24 opening towards the rotor axis.
  • a second exemplary embodiment of a rotor is outlined, which in turn has a rotor disk 11 with a plurality of blade holding grooves 12 arranged distributed around the circumference. Similarly, there are fastening projections 13 located axially from one end face in the rotor disk 11 between the blade-holding grooves 12.
  • the blade root 32 has a fitted connecting piece 61, the connecting piece 61 in turn forming the fastening shoulder 33.
  • a securing element 71 is accommodated in a guide receptacle 34 on the fastening shoulder 33 of the connecting piece 61, which securing element 71 engages on both sides with an angled end 72, 73 in the respectively adjacent fastening projections 13.
  • Fig. 7 a simple embodiment of a securing element 71 in rod form with ends 72 and 73 angled on both sides.
  • the Fig. 8 shows the exemplary embodiment with the rotor disk 11 and the blade root 32, but with the connection piece 61 omitted. Again, the fastening projection 13 with the engagement receptacle 14 as an assembly opening can be seen, in each case between the blade retaining grooves 12.
  • connection piece 61 is outlined for the second embodiment. It can be seen that the connection piece 61, viewed in the axial direction, forms a U-shape, so that the fastening shoulder 33 is divided into two sections by a recess 62. In this respect, the two remaining sections form the guide receptacle, albeit reduced to a slight length.
  • the connecting piece has a coupling protrusion 63 which rises radially outward, the blade root 32 having a complementary depression.
  • a third exemplary embodiment for axially securing a moving blade with the blade root 22 on a rotor disk 01 by means of securing elements 41 is outlined in a perspective view.
  • the rotor disk 04 here has a fastening projection 03 which extends axially from one end face and which 03 is located between the blade retaining grooves 02.
  • the respective fastening projection 03 forms a guide receptacle 04 that opens radially outward and at the same time a tool opening.
  • two adjacent securing elements 41 are added.
  • the rotor blade 21 used here with the blade root 22 analogously has a fastening shoulder 23 which extends axially from the end face and extends over the width of the respective blade root 22 on both sides to the respectively adjacent fastening projections 03.
  • the fastening shoulder 23 has an engagement receptacle 24 that opens radially to the rotor axis.
  • the guide receptacle 24, the engagement receptacle 04 with a mounting opening and the securing element 41 extend in the circumferential direction. It can also be seen how the securing element 41 engages with the locking 42 in the engagement receptacle.
  • the bending section 43 is located opposite the detent 42.
  • the Fig. 12 once again outlines the exemplary embodiment in longitudinal section Figures 10 and 11 , again the rotor disk 01 with the blade holding groove 02 and the fastening projection 03 can be seen.
  • the guide receptacle 04 which extends in the circumferential direction and has the tool opening formed by the open groove shape.
  • the securing element 41 is received in the guide receptacle 04.
  • the rotor blade with the blade root 22 has, on the fastening shoulder 23, the engagement receptacle 24 which extends in the circumferential direction.
  • the Fig. 13 shows in detail the arrangement of the adjacent securing elements 41 in the assembled position with the bending sections 43, the end faces of which abut one another.
  • the bending sections 43 each form the blocking for the opposite bending section 43.
  • the rotor disk 01 is designed essentially in accordance with the first embodiment, which is shown in FIG Fig. 4 is outlined.
  • the blade root 22 of the moving blade 21 is essentially the same in FIG Fig. 5 shown.
  • Fig. 14 a simple embodiment of a securing element 41 in the form of a rod with the locking device at one end and the bending section 43 opposite.
  • a fourth exemplary embodiment of a rotor is outlined, which in turn has a rotor disk 11 with a plurality of blade holding grooves 12 arranged distributed around the circumference. Similarly, there are fastening projections 13 located in the rotor disk 11 between the blade-holding grooves 12, each axially in front of an end face.
  • the blade root 32 has a fitted connecting piece 61, the connecting piece 61 in turn forming the fastening shoulder 33.
  • the Figures 16 and 17 outline a fifth exemplary embodiment of a rotor according to the invention.
  • the rotor disk 51 can be seen with the blade holding grooves 52 distributed around the outer circumference. Between the blade holding grooves 52 in front of an end face of the rotor disk 51 there are fastening projections 53 in each case. These 53 have the guide receptacle 54 which extends in the circumferential direction. This 54 is designed to open axially in the manner of a dovetail groove, so that on the one hand there is axial positioning and tool access is also possible.
  • the securing elements 41 are arranged in pairs in the guide receptacle 54. According to the previous exemplary embodiment, these have the locking device 42 at one end and the bending sections 43 at the opposite end. It can again be seen that the locking device 42 is arranged in the area of the blade retaining grooves 52, so that a rotor blade located there with an associated fastening shoulder on the blade root can be axially fixed by engagement of the locking device 42 in an engagement receptacle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP18177021.5A 2018-06-11 2018-06-11 Rotor pourvu de pales tournantes verrouillées axialement sur le disque de rotor Withdrawn EP3581765A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18177021.5A EP3581765A1 (fr) 2018-06-11 2018-06-11 Rotor pourvu de pales tournantes verrouillées axialement sur le disque de rotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18177021.5A EP3581765A1 (fr) 2018-06-11 2018-06-11 Rotor pourvu de pales tournantes verrouillées axialement sur le disque de rotor

Publications (1)

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EP3581765A1 true EP3581765A1 (fr) 2019-12-18

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Application Number Title Priority Date Filing Date
EP18177021.5A Withdrawn EP3581765A1 (fr) 2018-06-11 2018-06-11 Rotor pourvu de pales tournantes verrouillées axialement sur le disque de rotor

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2258273A (en) * 1991-08-02 1993-02-03 Ruston Gas Turbines Ltd Rotor blade locking arrangement.
DE19960896A1 (de) * 1999-12-17 2001-06-28 Rolls Royce Deutschland Rückhaltevorrichtung für Rotorschaufeln einer Axialturbomaschine
DE102008013118A1 (de) * 2008-03-07 2009-09-10 Man Diesel Se Anordnung zum Befestigen von Turbinenschaufeln
EP2488725A1 (fr) * 2009-10-13 2012-08-22 Turbomeca Roue de turbine equipee d'un jonc de retenue axiale verrouillant des pales par rapport a un disque

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2258273A (en) * 1991-08-02 1993-02-03 Ruston Gas Turbines Ltd Rotor blade locking arrangement.
DE19960896A1 (de) * 1999-12-17 2001-06-28 Rolls Royce Deutschland Rückhaltevorrichtung für Rotorschaufeln einer Axialturbomaschine
DE102008013118A1 (de) * 2008-03-07 2009-09-10 Man Diesel Se Anordnung zum Befestigen von Turbinenschaufeln
EP2488725A1 (fr) * 2009-10-13 2012-08-22 Turbomeca Roue de turbine equipee d'un jonc de retenue axiale verrouillant des pales par rapport a un disque

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