EP2609292A1 - Aube mobile à plaque de recouvrement pour turbine à vapeur - Google Patents

Aube mobile à plaque de recouvrement pour turbine à vapeur

Info

Publication number
EP2609292A1
EP2609292A1 EP11766987.9A EP11766987A EP2609292A1 EP 2609292 A1 EP2609292 A1 EP 2609292A1 EP 11766987 A EP11766987 A EP 11766987A EP 2609292 A1 EP2609292 A1 EP 2609292A1
Authority
EP
European Patent Office
Prior art keywords
blade
plate
steam turbine
shield plate
base plate
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Withdrawn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
EP11766987.9A
Other languages
German (de)
English (en)
Inventor
Frank Deister
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 EP11766987.9A priority Critical patent/EP2609292A1/fr
Publication of EP2609292A1 publication Critical patent/EP2609292A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F01D5/12—Blades
    • F01D5/22—Blade-to-blade connections, e.g. for damping vibrations
    • F01D5/225—Blade-to-blade connections, e.g. for damping vibrations by shrouding
    • 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
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
    • 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
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/141—Shape, i.e. outer, aerodynamic form
    • F01D5/142—Shape, i.e. outer, aerodynamic form of the blades of successive rotor or stator blade-rows
    • F01D5/143—Contour of the outer or inner working fluid flow path wall, i.e. shroud or hub contour
    • 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
    • F01D5/12—Blades
    • F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • F01D5/288—Protective coatings for blades
    • 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
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/31—Application in turbines in steam turbines

Definitions

  • the invention relates to a blade with a cover plate for a steam turbine.
  • the blades of a final stage of a Nie ⁇ derdruckturbine are long formed in their radial extent and thus must withstand the stresses of a high peripheral speed at the blade tips of the blades and increased heating due to increasingly occurring in the final stage on ⁇ ventilation effects.
  • the material titanium can be used, which is characterized in addition to a high corrosion resistance by a high strength and a low specific weight.
  • a cover band is provided for last run rows.
  • the invention has for its object to provide a blade for a steam turbine, in which the above problems are largely overcome and the blade is protected against droplet erosion.
  • the rotor blade according to the invention for a steam turbine has an airfoil, which has a blade leading edge and a blade tip, and a cover plate.
  • the cover ⁇ plate has a base plate which is attached to the blade tip of the blade and is substantially parallel to the machine axis of the steam turbine in the installed state, and a shield plate, which is upstream of the blade leading edge on the base plate and from this radially inwardly vorste ⁇ formed so that the blade tip rests with its region of the blade leading edge in the lee of the shield plate when the blade is a flow from a HauptdampfStrö ⁇ mung the steam turbine.
  • the region of the blade arranged in the lee of the shield plate is thus protected from droplet impact erosion caused by the main steam flow.
  • a particularly loaded transition region from the blade tip to the base plate is protected from the drop impact erosion, resulting in costly constructional Measures to strengthen this transition region do not have to be taken before ⁇ .
  • the blade tip is ⁇ be covered between the shield plate and the base plate with an erosion resistant protective material, so that the blade tip is protected in the area of Schaufelvor ⁇ derkante before a drop impact erosion.
  • the protective material is glove-like over the blade ⁇ areas pulled that it should protect, for example, over areas of the blade tip and / or the base plate and / or the shield plate.
  • the protective material can also be replaced during maintenance or inspection work. As a result, it follows that the protective material needs to be formed in its durability only as specified by the scheduled maintenance or inspection intervals. Furthermore, with the shaping of the protective material, the flow around the cover plate can be favorably influenced.
  • the blade tip between the shield plate and the base plate is so resistant to erosion
  • the shield plate is preferably arranged at an axial distance from the vane leading edge of the same, whereby the axial extent of the base plate and thus the axial sealing width of the cover plate are large.
  • A is Adjustab ⁇ loin during operation of the associated steam turbine at the blade steam leakage is minimized, thereby We ⁇ ciency of the steam turbine is improved.
  • the shield plate is preferably formed in its radial extension in such a way that a dead water region forming empty side in the slipstream of the shield plate during operation of the steam turbine extends axially along the entire base plate. stretches.
  • the dead water area is in particular formed in a recirculating manner and the main steam flow has no direct contact with the base plate along the dead water area, so that the radial position of the inner edge of the plate results in a flow-mechanically effective pitch angle of the cover plate. So as the cover plate underside leads the main steam flow directly, the Deckplat ⁇ tenunterseite from the main steam flow need not be contacted accordingly. As a result, consideration must be given only to strength requirements in the construction of the cover plate, whereby the cover plate is made easier compared with a conventional construction and thus at the blade tip a lower centrifugal force occurs ⁇ .
  • the shield plate is preferably constructed in such a way that the dead water region is continuously maintained during a flow around the rotor blade and it is not possible for a transient vortex shedding to take place from the shield plate. This ensures that the excess ⁇ transition area from the blade tip to the base plate during the entire operation of the steam turbine before impingement ⁇ erosion is protected. Further, occurrence of vibrations caused by vortex shedding is prevented.
  • Fig. 1 shows a first embodiment of the invention
  • Blade with a cover plate having a shield ⁇ plate and a base plate, further imple mentation forms of the rotor blade according to the invention, in which the blade tip is covered with a erosion-resistant protective material and
  • Fig. 5 shows a conventional blade with a shroud.
  • a rotor blade 1 is shown for a steam turbine ⁇ .
  • the rotor blade 1 comprises an airfoil 2, which has a blade leading edge 3 and a blade tip 4, and a cover plate 5.
  • the cover plate 5 comprises a shield plate 6 and a base plate 7, with which the cover ⁇ plate 5 is attached to the blade tip 4.
  • the base ⁇ plate 7 is aligned in the installed state substantially parallel to a machine axis 8 of the steam turbine.
  • the plate 6 is projecting radially inwards, which is also arranged at a distance from the blade leading edge 3.
  • the cover plate 5 also has meh ⁇ rere sealing tips 9 for sealing a gap between the base plate 7 and a steam turbine housing 10.
  • the illustrated in Fig. 1 blade 1 is provided with a
  • Main steam flow represented by the arrows 11, beauf ⁇ hits that the airfoil 2 and the cover plate 5 flows around ⁇ .
  • the main steam flow breaks off, as a result of which the shield plate 6 on the leeward side forms a dead water region 13 which extends axially along the base plate 7.
  • the dead water region 13 is arranged at a transition region 14 between the blade tip 4 and the base plate 7.
  • the dead water area 13 is formed by a vortex 15, from which the main steam flow is guided.
  • the vortex 15 defines the fluidically effective pitch angle 16 of the cover plate 5, which is predetermined by the construction of the shield plate 6.
  • the base plate 7 Since the pitch angle 16 depends on the position of the radially inner edge of the shield plate 6 and not on the blade side contour of the base plate 7, the base plate 7 is plate-like and thus lightweight. The base plate 7 can therefore be made long in its axial extension without the blade 1 inadmissible high mechanical load. Due to the large axial extension of the base plate 7 additional sealing ⁇ tips 9 can be provided on the base plate 7, whereby the sealing efficiency of the cover plate 5 increases and thus the thermal dynamic efficiency of the associated steam turbine is gestei ⁇ Gert.
  • FIG. 2 shows the blade 1 according to the invention, which is provided with an erosion-resistant protective material 17.
  • the protective material 17 is attached 4 Zvi ⁇ rule of the shield plate 6 and the base plate 7 in the region of the blade tip and protects the vulnerable by droplet impact erosion of the transition region 14 and parts of the blade leading edge 3.
  • the protective material 17 is also formed so that it in the course of maintenance and inspection work can be easily changed.
  • the protective material 17 is attached to the scene ⁇ felvorderkante 3, whereby this area is protected from Trop ⁇ fenschlagerosion.
  • 4 shows another embodiment of the blade 1 with the attached protective material 17. Due to the shape of the protective material 17, the flow around the blade 1 is favorably influenced, whereby the transition region 14 is protected. Furthermore, the protective material 17 is protected against tearing by the shield plate 6 at the particularly stressed areas, whereby the intervals for changing the protective material 17 are long.
  • FIG. 5 shows a blade 101 for a steam turbine according to the prior art.
  • a HauptdampfStrö ⁇ mung represented by the arrows 102 is guided in the region of a blade tip 103 of the blade 101 by means of a cover ⁇ bands 104th
  • the shroud 104 must therefore be formed con- tured, to lead to its blade-side contour 105, the main steam flow, and (not shown) on its side facing the steam turbine casing fed wall ⁇ th page to close the gap by means of sealing tips 106th
  • the mass of the shroud 104 is due to this construction so large compared with the mass of the cover plate 5 according to the invention, that the axial extent of the shroud 104 must be kept short. As a result, only a few sealing tips 106 can be provided on the shroud 104. This affects the sealing efficiency of the shroud 104 and thus the thermodynamic efficiency of the steam turbine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

La présente invention concerne une aube mobile (1) pour une turbine à vapeur comprenant un aubage (2) comportant une arête avant d'aube (3) et un bout d'aube (4), et une plaque de recouvrement (5). La plaque de recouvrement (5) comprend une plaque de base (7) disposée sur le bout d'aube (4) de l'aubage (2) et sensiblement parallèle à l'axe de machine (8) de la turbine à vapeur dans l'état monté, et une plaque (6) réalisée en aval de l'arête avant d'aube (3) sur la plaque de base (7) et faisant saillie radialement vers l'intérieur de celle-ci, de sorte que le bout d'aube (4) se situe avec sa zone de l'arête avant d'aube (3) dans le côté sous le vent de la plaque (6) lorsqu'un courant de vapeur principal de la turbine à vapeur est soufflé sur l'aube mobile (1).
EP11766987.9A 2010-10-05 2011-10-05 Aube mobile à plaque de recouvrement pour turbine à vapeur Withdrawn EP2609292A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11766987.9A EP2609292A1 (fr) 2010-10-05 2011-10-05 Aube mobile à plaque de recouvrement pour turbine à vapeur

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10186573A EP2439376A1 (fr) 2010-10-05 2010-10-05 Aube de rotor carénée pour une turbine à vapeur
EP11766987.9A EP2609292A1 (fr) 2010-10-05 2011-10-05 Aube mobile à plaque de recouvrement pour turbine à vapeur
PCT/EP2011/067366 WO2012045765A1 (fr) 2010-10-05 2011-10-05 Aube mobile à plaque de recouvrement pour turbine à vapeur

Publications (1)

Publication Number Publication Date
EP2609292A1 true EP2609292A1 (fr) 2013-07-03

Family

ID=43754769

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10186573A Withdrawn EP2439376A1 (fr) 2010-10-05 2010-10-05 Aube de rotor carénée pour une turbine à vapeur
EP11766987.9A Withdrawn EP2609292A1 (fr) 2010-10-05 2011-10-05 Aube mobile à plaque de recouvrement pour turbine à vapeur

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP10186573A Withdrawn EP2439376A1 (fr) 2010-10-05 2010-10-05 Aube de rotor carénée pour une turbine à vapeur

Country Status (3)

Country Link
EP (2) EP2439376A1 (fr)
CN (1) CN103154436B (fr)
WO (1) WO2012045765A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5490191B2 (ja) * 2012-07-19 2014-05-14 三菱重工業株式会社 ガスタービン
FR3084398B1 (fr) 2018-07-24 2021-04-16 Safran Aircraft Engines Aube de turbine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE422950C (de) * 1923-12-22 1925-12-16 Erste Bruenner Maschinen Fab Spaltausbildung fuer achsiale Dampf- oder Gasturbinen
WO1998044240A1 (fr) * 1997-04-01 1998-10-08 Siemens Aktiengesellschaft Structure superficielle pour la paroi d'un canal d'ecoulement ou d'une aube de turbine
JP4886271B2 (ja) * 2005-10-31 2012-02-29 株式会社東芝 蒸気タービンおよびその親水性コーティング材料
US7422415B2 (en) * 2006-05-23 2008-09-09 General Electric Company Airfoil and method for moisture removal and steam injection
EP2072757A1 (fr) * 2007-12-20 2009-06-24 Siemens Aktiengesellschaft Bouclier anti-érosion pour aube rotative

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012045765A1 *

Also Published As

Publication number Publication date
CN103154436B (zh) 2015-08-19
CN103154436A (zh) 2013-06-12
EP2439376A1 (fr) 2012-04-11
WO2012045765A1 (fr) 2012-04-12

Similar Documents

Publication Publication Date Title
EP2409002B1 (fr) Construction d'aubes en tandem
DE102008055824B4 (de) Dampfturbine
DE112006002658B4 (de) Turbomaschinenschaufel
EP2626515B1 (fr) Agencement de groupes d'aubes en tandem
EP2696029B1 (fr) Grille d'aube avec définition de contour de la paroi latérale et turbomachine
EP2692986B1 (fr) Grille d'aube avec définition de contour de la paroi latérale et turbomachine
EP2860347B1 (fr) Grille d'aube de compresseur de turbines à gaz
EP2746533B1 (fr) Grille d'aube et turbomachine
WO2007113149A1 (fr) Aube directrice de turbomachine, notamment de turbine à vapeur
EP2558685B1 (fr) Aube directrice
EP2647795A1 (fr) Système d'étanchéité pour turbomachine
DE102009003523A1 (de) Dampfturbinen-Schaufel für Niederdruck-Abschnitt
DE102007020025A1 (de) Form eines Gaskanals in einer Axialströmungs-Gasturbinenmaschine
DE102009043889A1 (de) Dampfturbinen-Rotationslaufschaufel für einen Niederdruckabschnitt einer Dampfturbine
EP2626513B1 (fr) Ensemble d'aubes en tandem
EP2607625B1 (fr) Turbomachine et étage de turbomachine
DE102016217093A1 (de) Koppelbolzen sowie Turbine mit Koppelbolzen
DE102011054307A1 (de) Endstück für Turbinenlaufschaufel-Deckband
DE202012005356U1 (de) Rotorblatt für Windturbinen mit Profilen in Tandemanordnung
WO2012045765A1 (fr) Aube mobile à plaque de recouvrement pour turbine à vapeur
EP2576987B1 (fr) Aube de turbomachine à influence passive de couche limite
EP2458149B1 (fr) Aubage pour turboréacteur
DE102014206217B4 (de) Verdichtungsgitter für einen Axialverdichter
DE102013212880A1 (de) Aerodynamisches Koppelelement zweier Laufschaufeln
EP3211215B1 (fr) Aube de rotor d'une turbomachine hydraulique comprenant une barre anti-cavitation et barre anti-cavitation pour une aube de rotor

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20130325

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20161028