EP1165940B1 - Axial gezinktes segment zum befestigen turbinenschaufeln an einem turbinenrad und einbaumethoden dafür - Google Patents

Axial gezinktes segment zum befestigen turbinenschaufeln an einem turbinenrad und einbaumethoden dafür Download PDF

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Publication number
EP1165940B1
EP1165940B1 EP00907136A EP00907136A EP1165940B1 EP 1165940 B1 EP1165940 B1 EP 1165940B1 EP 00907136 A EP00907136 A EP 00907136A EP 00907136 A EP00907136 A EP 00907136A EP 1165940 B1 EP1165940 B1 EP 1165940B1
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EP
European Patent Office
Prior art keywords
buckets
rotor wheel
dovetail
bucket
female
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.)
Expired - Lifetime
Application number
EP00907136A
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English (en)
French (fr)
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EP1165940A1 (de
Inventor
David Alan Caruso
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.)
General Electric Co
Original Assignee
General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority claimed from PCT/US2000/002835 external-priority patent/WO2001057365A1/en
Publication of EP1165940A1 publication Critical patent/EP1165940A1/de
Application granted granted Critical
Publication of EP1165940B1 publication Critical patent/EP1165940B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the present invention relates to axial entry dovetail attachments between buckets and the wheel of a turbine rotor and particularly relates to an axially inserted dovetail segment for securing the final or closure bucket of a series of axially inserted buckets on a turbine rotor wheel.
  • One such arrangement is shown in US-A-4 904 160 and US-A-3 627 448.
  • Axial entry buckets i. e., rotor blades
  • the turbine buckets have male radially inwardly projecting dovetails for mating engagement with radially inwardly directed female dovetails on the turbine wheel.
  • the wheel dovetails are circumferentially spaced from one another about the wheel.
  • Axial entry buckets on turbine wheels have proven quite satisfactory in assembly and use.
  • shrouds typically have overlapping protrusions that nest with shrouds of adjacent buckets.
  • certain shrouds may have, a generally Z-shaped configuration when viewed in a radially inward direction.
  • the protrusions of adjacent shrouds typically the first assembled and next to the last assembled buckets, prevent assembly of the last axial entry bucket from either the upstream or downstream sides of the wheel.
  • the blocking shroud protrusions cannot be removed because the shrouds must be in contact with one another to maintain continuous circumferential coupling of the buckets at their tips in use. Consequently, securing the final or closure bucket with its shroud to the otherwise completed wheel assembly by the axial entry assembly method presents a problem..
  • a turbine having a rotor wheel and a plurality of axial entry buckets each securable to the rotor wheel with a first male dovetail which passes through a first female dovetail in the rotor wheel, each bucket including a shroud of the type which nests with the shroud of an adjacent blade to form a continuous circumferential shroud assembly
  • the turbine characterized by a last-to-be installed bucket assembly comprising an additional bucket configured for attachment to the rotor wheel from a radial direction to permit nesting of an associated shroud with shrouds of adjacent axial entry buckets, said additional bucket including a second female dovetail positioned at a radial inner end such that a second male dovetail, having a complementary shape to the first female dovetail in the rotor wheel, and a complementary shape to the second female dovetail at the radial inner end of said additional bucket, may be simultaneously positioned in the first and second female dovetails to effect
  • the second male dovetail is a segment body having generally radial opposite male dovetails, one of said dovetails comprising a fir tree configuration including at least two hooks projecting to each side of said segment.
  • a method for installing turbine buckets to a turbine rotor wheel where the rotor wheel comprises first axial entry female dovetails spaced one from the other circumferentially about the rotor wheel, each female dovetail configured to receive a single one of a plurality of buckets for attachment to the rotor wheel, each bucket including a shroud of the type which nests with the shrouds of adjacent blades to form a continuous circumferential shroud assembly, the method comprising the steps of providing a second female dovetail on a radial inner end of a last one of the plurality of buckets; providing on a radial inner end of the other ones of the plurality of buckets a first male dovetail with which each of the other ones of the buckets may be attached to the rotor wheel; inserting each male dovetail along an axial direction into the first female dovetail to effect attachment of each of the other ones of the buckets to the rotor wheel; installing said last one
  • Rotor wheel 10 is rotatable about an axis and has a series of female dovetails 12 spaced circumferentially one from the other about the periphery of the wheel.
  • the female dovetails 12 extend axially, i. e., parallel to female dovetails 12 spaced circumferentially one from the other about the periphery of the wheel.
  • the female dovetails 12 extend axially, i.e., parallel to the axis of the rotor wheel and receive mating male dovetails 14 formed on the inner ends of buckets 16.
  • the buckets 16 constitute a series of blades or vanes which are acted upon by the hot gases in the flowpath of the turbine to rotate the rotor wheel.
  • the radial inner ends of the buckets 16 are each provided with the male dovetails 14 which enable axial entry of the buckets to the female dovetails upon assembly of the buckets onto the rotor wheel.
  • Buckets 16 also include shrouds or covers 18 at their radially outer ends which in final assembly contact one another maintaining a continuous circumferential shroud assembly about the bucket tips.
  • Covers 18 of course rotate with the buckets 16 and rotor wheel 10.
  • the covers 18 as illustrated have a generally Z-shaped configuration as viewed in a radial direction and thus interlock or nest with adjacent covers. While the Z-shaped cover configuration is preferred, there are configurations of covers other than Z-shaped. For example, the covers may have linear angled edges. The particular configuration of the covers is dictated to large extent by the twist and curvature of the buckets 16 which circumferentially offsets the leading and trailing edges of the bucket.
  • buckets 16 are assembled serially around the wheel.
  • a first bucket 16a is assembled to the rotor wheel 10 by axially displacing the male dovetail 14a into the female dovetail 12a.
  • the next bucket 16b is similarly assembled to the rotor wheel 10 by axially displacing the male dovetail 14b into the female dovetail 12b of the rotor wheel.
  • the covers 18a and 18b on the bucket 16a and 16b respectively nest with one another upon such axial entry.
  • Additional buckets are secured to the rotor wheel in like fashion serially about wheel 10 and eventually the next to the last bucket 16x is installed on the rotor wheel 10 by inserting the male dovetail 14x into the female dovetail 12x.
  • the buckets save for one final bucket, are axially inserted into and completely installed about the rotor wheel with the covers 18 in nesting relation relative to one another.
  • the final or closure bucket 16y cannot be inserted relative to the rotor wheel from either axial direction because the cover 18y cannot pass through the openings defined by the adjacent covers 18a and 18x. Consequently, a different type of connection and assembly procedure is required to install the final bucket 16y onto the rotor wheel 10.
  • the final bucket 16y is provided with an axially extending female dovetail 20 along its radial inner end. Additionally, as best illustrated in Figure 2, an axial entry dovetail segment 22 is provided for joining the final bucket 16y to the rotor wheel 10 at the female dovetail connection 12v. It will be appreciated that the dovetail connection 12y is identical to the dovetail connections 14 spaced circumferentially about the rotor wheel 10.
  • the axial entry dovetail segment 22 includes male projecting dovetails 24 and 26 along radially opposite sides of the segment, the segment extending axially a distance corresponding to the axial length of the male dovetails on the buckets 16.
  • the radial innermost male dovetail 24 on segment 22 has a generally complementary shape to the female dovetail 14y; whereas the radially outer male dovetail 26 on segment 22 is generally complementary in shape to the female dovetail 20 of the final bucket 16y.
  • the radially inner base of the bucket is readily disposed between the radial inner bases of the adjacent buckets 16a and 16x. Additionally the cover 18y of final bucket 16y nests between the covers 18a and 18x of the adjacent buckets.
  • the axial entry dovetail segment 22 is driven axially such that the male dovetails of the segment respectively engage in the female dovetails of the final bucket 16v and the rotor wheel 10.
  • the geometry of the radially inner male dovetail 24 of the segment 22 is the same as the female dovetails 12 on the rotor wheel. That is, the hooks 25 of the dovetails are substantially complementary to one another.
  • the radially outer male dovetail 26 of segment 22 is complementary in shape to the female dovetail on the final or closure buckets 16y. That is, the hooks 27 of the male dovetail are substantially complementary to the hooks of the female dovetail.
  • the protrusions or tangs 28 on the segment 22 These tangs 28 provide tangential restraint in the mating final or closure bucket female dovetail. Hooks 25 and 27, of course, engage corresponding hooks in the wheel dovetail and the final bucket female dovetail in final assembly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Claims (3)

  1. Turbine mit einem Rotorlaufrad (10) und einer Anzahl von in Axialrichtung eingesetzten Schaufeln (16a, 16b, ... 16x), die jeweils an dem Rotorlaufrad (10) mit einem ersten Schwalbenschwanz (14), der in einen ersten Komplementärschwalbenschwanz (12) in dem Rotorlaufrad greift, befestigbar sind, wobei jede Schaufel ein Deckband (18) aufweist, das in das Deckband (18) einer angrenzenden Schaufel eingebettet ist, um eine gleichmäßige Deckbandbaugruppe in Umfangsrichtung zu bilden, wobei die Turbine durch eine zuletzt einzubauende Schaufelbaugruppe mit einer zusätzlichen Schaufel (16y) gekennzeichnet ist, die zur Befestigung aus radialer Richtung an dem Rotorlaufrad ausgelegt ist, um das Einbetten eines zugehörigen Deckbands (18) in Deckbänder von angrenzenden, in Axialrichtung eingesetzten Schaufeln zu erlauben, wobei die zusätzliche Schaufel einen zweiten Komplementärschwalbenschwanz (20) aufweist, der so an einem radialen inneren Ende positioniert ist, dass ein zweiter Schwalbenschwanz (22) mit einer dem ersten Komplementärschwalbenschwanz (12) in dem Rotorlaufrad komplementären Form (24) und einer dem zweiten Komplementärschwalbenschwanz (20) an dem radialen inneren Ende der zusätzlichen Schaufel komplementären Form (26) gleichzeitig in den ersten und zweiten Komplementärschwalbenschwänzen (12, 20) positioniert werden kann, um die Befestigung der zusätzlichen Schaufel (16y) an dem Rotorlaufrad (10) zu bewirken.
  2. Turbine nach Anspruch 1, wobei der zweite Schwalbenschwanz ein Segmentkörper (22) mit im Allgemeinen radial sich gegenüberliegenden Schwalbenschwänzen (24, 26) ist, wobei der eine Schwalbenschwanz (24) eine Tannenbaumkonfiguration mit wenigstens zwei zu jeder Seite des Segments hervorstehenden Haken aufweist.
  3. Verfahren zum Einbauen von Turbinenschaufeln in ein Turbinenrotorlaufrad (10), bei dem das Rotorlaufrad (10) erste, in Axialrichtung eingreifende Komplementärschwalbenschwänze (12) aufweist, die in Umfangsrichtung um das Rotorlaufrad (10) voneinander beabstandet sind, wobei jeder Komplementärschwalbenschwanz (12) so konfiguriert ist, dass er eine einzige einer Anzahl von Schaufeln (16a, 16b, ...16x, 16y) zur Befestigung an dem Rotorlaufrad (10) aufnimmt, jede Schaufel ein Deckband (18) aufweist, das in die Deckbänder (18) angrenzender Schaufelblätter eingebettet ist, um eine gleichmäßige Deckbandbaugruppe in Umfangsrichtung zu bilden, und das Verfahren folgende Schritte umfasst:
    Bereitstellen eines zweiten Komplementärschwalbenschwanzes (20) an einem radialen inneren Ende einer letzten (16y) der Anzahl von Schaufeln;
    Bereitstellen an einem radialen inneren Ende der anderen der Anzahl von Schaufeln (16a, 16b, ...16x) eines ersten Schwalbenschwanzes (14), mit dem jede der anderen Schaufeln an dem Rotorlaufrad (10) befestigt werden kann;
    Einsetzen jedes Schwalbenschwanzes (14) entlang einer Axialrichtung in den ersten Komplementärschwalbenschwanz (12), um die Befestigung von jeder der anderen Schaufeln an dem Rotorlaufrad (10) zu bewirken;
    Montieren der letzten (16y) der Anzahl von Schaufeln an dem Rotorlaufrad (10) aus einer radialen Richtung, um das Einbetten eines zugehörigen Deckbands (18) in angrenzende Deckbänder (18) anderer der Schaufeln zu erlauben; und
    Einsetzen eines zweiten Schwalbenschwanzes (22) entlang einer Axialrichtung in einen ersten Komplementärschwalbenschwanz (12) und in den zweiten Komplementärschwalbenschwanz (20) der letzten der Anzahl von Schaufeln, um die letzte (18) der Schaufeln und das Laufrad (10) aneinander zu befestigen.
EP00907136A 2000-02-03 2000-02-03 Axial gezinktes segment zum befestigen turbinenschaufeln an einem turbinenrad und einbaumethoden dafür Expired - Lifetime EP1165940B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2000/002835 WO2001057365A1 (en) 1998-09-14 2000-02-03 Means for securing a bucket to a turbine wheel and methods of installation

Publications (2)

Publication Number Publication Date
EP1165940A1 EP1165940A1 (de) 2002-01-02
EP1165940B1 true EP1165940B1 (de) 2007-04-18

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EP00907136A Expired - Lifetime EP1165940B1 (de) 2000-02-03 2000-02-03 Axial gezinktes segment zum befestigen turbinenschaufeln an einem turbinenrad und einbaumethoden dafür

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EP (1) EP1165940B1 (de)
JP (1) JP4572399B2 (de)
KR (1) KR100785544B1 (de)
DE (1) DE60034440T2 (de)

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KR100642466B1 (ko) * 2005-10-07 2006-11-02 두산중공업 주식회사 터빈용 로터의 일체형 버킷조립용 지그
JP5238631B2 (ja) * 2009-07-10 2013-07-17 株式会社東芝 タービン動翼列組立体および蒸気タービン
KR101628613B1 (ko) * 2015-04-01 2016-06-08 두산중공업 주식회사 버켓의 축방향 고정장치
KR101999445B1 (ko) 2017-10-30 2019-07-11 두산중공업 주식회사 버킷의 체결 구조 및 이를 포함하는 증기터빈
KR102040958B1 (ko) 2017-10-30 2019-11-05 두산중공업 주식회사 로터의 실링 구조와 이를 포함하는 로터 및 증기터빈
KR102040960B1 (ko) 2017-10-30 2019-11-05 두산중공업 주식회사 버킷의 고정 구조 및 이를 포함하는 증기터빈
KR20190052481A (ko) 2017-11-08 2019-05-16 두산중공업 주식회사 버킷의 체결 구조 및 이를 포함하는 증기터빈
KR102011578B1 (ko) 2017-11-09 2019-10-21 두산중공업 주식회사 버킷의 커버 구조와 이를 포함하는 로터 및 증기터빈
KR102005637B1 (ko) 2017-11-21 2019-07-30 두산중공업 주식회사 버킷의 체결 구조 및 이를 포함하는 증기터빈
KR101999447B1 (ko) 2017-11-21 2019-07-11 두산중공업 주식회사 버킷의 체결 구조 및 이를 포함하는 증기터빈

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Also Published As

Publication number Publication date
KR20020005646A (ko) 2002-01-17
DE60034440D1 (de) 2007-05-31
DE60034440T2 (de) 2008-01-03
JP4572399B2 (ja) 2010-11-04
JP2003521622A (ja) 2003-07-15
KR100785544B1 (ko) 2007-12-12
EP1165940A1 (de) 2002-01-02

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