EP2692990B1 - Leitschaufel einer Dampfturbine und zugehörige Dampfturbine - Google Patents

Leitschaufel einer Dampfturbine und zugehörige Dampfturbine Download PDF

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Publication number
EP2692990B1
EP2692990B1 EP13178438.1A EP13178438A EP2692990B1 EP 2692990 B1 EP2692990 B1 EP 2692990B1 EP 13178438 A EP13178438 A EP 13178438A EP 2692990 B1 EP2692990 B1 EP 2692990B1
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EP
European Patent Office
Prior art keywords
blade
metal plate
stationary blade
airfoil
side metal
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Active
Application number
EP13178438.1A
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English (en)
French (fr)
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EP2692990A2 (de
EP2692990A3 (de
Inventor
Susumu Nakano
Shunsuke Mizumi
Takeshi Kudo
Kazuya Sakakibara
Koji Ishibashi
Masaki Matsuda
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Mitsubishi Power Ltd
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Mitsubishi Hitachi Power Systems Ltd
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Publication of EP2692990A3 publication Critical patent/EP2692990A3/de
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    • 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
    • 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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
    • 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
    • F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow 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
    • F05D2240/00—Components
    • F05D2240/10—Stators
    • F05D2240/12—Fluid guiding means, e.g. vanes
    • F05D2240/122—Fluid guiding means, e.g. vanes related to the trailing edge of a stator vane

Definitions

  • the present invention relates to a steam turbine, and more particularly, to a stationary blade structure to eliminate a liquid film generated on a stationary blade surface so as to reduce moving blade erosion due to collision of water droplets, which are generated particularly with wet steam, with a moving blade.
  • the pressure is very low, accordingly, steam as a working fluid is in a state of wet steam including liquefied minute water droplets (molecules of the vapor) .
  • the molecules of the vapor condensed and deposited to the blade surface coalesce to each other and form a liquid film on the blade surface. Further, the liquid film is ripped down with the steam of a working fluid mainstream, or fly in the steam flow again from a blade trailing edge.
  • These water droplets are sprayed to the downstream as coarse droplets far larger in comparison with the initially occurred molecules of the vapor . Then the coarse droplets are broken up into smaller size, however, flow down while being maintained in some size.
  • the coarse droplets do not sharply turn along the passage as in the case of steam due to its inertial force, and collide against the downstream moving blade at a high speed, which causes erosion to erode the blade surface, or causes loss due to action of a force against the rotation of the turbine blade.
  • Patent Literature 2 Japanese Unexamined Patent Application No. Hei 1(1989)-110812
  • Patent Literature 3 Japanese Unexamined Patent Application No. Hei 11(1999)-336503
  • a method of sucking the liquid film by providing a hollow stationary blade (hollow nozzle) with a slit in its blade surface and reducing the pressure in the hollow stationary blade is used.
  • these slits are formed by directly processing the blade surface of a stationary blade structure having a hollow structure.
  • Patent Literature 4 Japanese Unexamined Patent Application No. 2007-23895
  • a method of processing a slit member as a separate member and attaching it to a stationary blade is known.
  • Patent Literature 5 Soviet Union Unexamined Patent Application No. SU 771 350 A1 a heating steam is supplied to the surface of a blade body to evaporate and dry moisture. The heating steam is supplied to the channels through holes.
  • Patent Literature 6 Soviet Union Unexamined Patent Application No. SU 848 708 A1 .
  • the blade has an airfoil suction-side metal plate and an airfoil pressure-side metal plate with a passage therebetween.
  • the tail part of the blade has a slit which is connected to the passage.
  • the passage includes a plurality of fluid channels which connect the slit with a plurality of collectors inside the blade
  • a tail part, which includes a blade trailing edge, of the blade has an acute shape with a small thickness . Accordingly, even when the hollow structure of the stationary blade is formed by bending one plate and combining in the tail part or when the hollow part is formed by boring the inside of a solid member, it is necessary to form the slit from the blade surface to the blade hollow region by processing a position away to some extent from the blade trailing edge.
  • the slit formation position is necessarily away to some extent from the blade trailing edge as in the case of the above example.
  • the slit position is a significant factor.
  • the moisture content integrated on the blade surface is increased. Accordingly, when the slit position is in a position defined with the blade structure as in the case of the conventional slit processing, it is not sufficiently in the downstream region and there is a probability that the moisture content is deposited to the blade again even in the downstream of the slit, and forms a liquid film.
  • the object of the present invention is, in a steam turbine, to reduce the erosive action on a moving blade by erosion and improve the reliability.
  • a steam turbine comprises a turbine stage having a stationary blade and a moving blade provided on the downstream side of the stationary blades in a working fluid flow direction, wherein the stationary blade is formed according to claim 1.
  • the present invention since it is possible to provide a slit and second slits on the upstream side of the slit to eliminate a liquid film generated on a blade wall surface of a stationary blade in the vicinity of a trailing edge of the stationary blade and to sufficiently eliminate the liquid film, it is possible to reduce an erosive action on a moving blade by erosion and to improve the reliability.
  • Fig. 1 is a schematic diagram showing the stage of a conventional steam turbine and the flow of a liquid film developed on a wall surface of its stationary blade.
  • the turbine stage of the steam turbine has stationary blades (nozzles) 1 fixed to an outer peripheral side diaphragm 4 and an inner peripheral side diaphragm 6, and moving blades (buckets) 2 fixed to a rotor shaft 3 on the downstream side of the stationary blades 1 in a working fluid flow direction.
  • a casing 7 forming a wall surface of the passage is provided on the outer peripheral side at an end of the moving blade 2.
  • a low pressure turbine or the like when the steam mainstream as a working fluid steam becomes in a state of wet steam, liquid droplets included in the steam mainstream are deposited to the stationary blade 1, and the liquid droplets congregate on the stationary blade surface to form a liquid film.
  • the liquid film flows in a direction of a force determined with a resultant force between pressure and a shear force in a boundary surface with respect to gas steam, and moves to a position in the vicinity of the trailing edge of the stationary blade.
  • Fig. 1 shows a flow 11 of the moving liquid film. The liquid film moved to the position in the vicinity of the trailing edge of the blade becomes liquid droplets 13, and fly together with the steam mainstream toward the moving blade 2.
  • Fig. 2 is a cross-sectional diagram of a passage between the stationary blades schematically showing a status where the liquid droplets are surface-stripped from the liquid film developed on the blade surface of the stationary blade 1.
  • the liquid droplets are deposited to the stationary blade 1, then the liquid droplets congregate on the stationary blade surface and is developed into a liquid film 12.
  • the liquid film 12 developed on the blade surface of the stationary blade 1 moves to the blade trailing edge, is surface-stripped and flies as the liquid droplets 13 from the blade trailing edge.
  • the surface-stripped liquid droplets 13 collide against the moving blade 2 provided downstream, to cause erosion to erode the moving blade surface or act a force against the rotation of the moving blade and cause loss.
  • Figs. 3 to 5 are explanatory diagrams showing the structure where the preset invention is applied to the stationary blade 1 in Fig. 1 .
  • Fig. 3 is a schematic perspective diagram of the stationary blade 1 according to the present embodiment, Fig. 4 , a cross-sectional diagram in a position indicated with an alternate long and two short dashes line in Fig. 3 , and Fig. 5 , an enlarged diagram of a blade tail part in Fig. 4 .
  • the stationary blade 1 of the present embodiment is formed by joining a main body 5 and a blade tail part 8 formed as a separate body of the main body 5 along a welding line 9.
  • the main body 5 is formed by plastically deforming a metal plate by pressing or the like, and has a hollow blade shape structure having a hollow part 26 inside.
  • the tail part 8 has a suction side plate 20 which is a metal plate forming a suction side wall surface of airfoil and a pressure side plate 21 plate which is a metal plate forming a pressure side wall surface of airfoil.
  • the pressure side 21 is attached to the suction side plate 20 while positioning piece 22 to be described later is held therebetween.
  • the positioning piece 22 has a disk-shaped brim 31 which plays a role of spacer and a cylindrical convex member 34 provided at both ends of the brim 31.
  • a disk-shaped brim 31 which plays a role of spacer and a cylindrical convex member 34 provided at both ends of the brim 31.
  • the shapes of the brim and the convex member of the positioning piece 22 are not limited to the disk shape and the cylindrical shape as long as they play the roles of position fixing and spacer.
  • one end of the suction side plate 20 is welded and fixed to the metal plate of the main body 5 on the suction side of airfoil, and the other end forms an acute-shaped blade trailing edge. Further, the surface of the suction side plate 20 on the blade inner surface side is partially cut from a position away to some extent from the blade trailing edge toward the main body 5 side, thus a step part 27 is provided.
  • the pressure side plate 21 is overlaid on the step part 27 of the suction side plate 20 with a gap therebetween.
  • One end of the pressure side plate 21 is welded and fixed to the metal plate of the main body 5 on the pressure side of airfoil, and the other end thereof has a gap with respect to the step part 27.
  • a slit 24 can be formed by providing the gap between the step part 27 of the suction side plate 20 and the end of the pressure side plate 21.
  • the wall of the slit 24 on the blade leading edge side is formed with the end of the pressure side plate 21, and the wall on the blade trailing edge side is formed with the suction side plate 20, and opened in the blade height direction.
  • the slit 24 is provided over the entire length in the blade height direction, however, it is not necessary to provide it over the entire length in the blade height direction. It may be provided in a part on the outer peripheral side in the blade height direction.
  • a pair of piece holes 29 and 30 where the above-described positioning piece 22 is provided are opened.
  • a gap 25 corresponding to the thickness of the brim 31 of the positioning piece 22 between the suction side plate 20 and the pressure side plate 21 by inserting the positioning piece 22 into the piece holes 29 and 30 and holding them between the suction side plate 20 and the pressure side plate 21. Since the pressure side plate 21 is overlaid on the step part 27 of the suction side plate 20 with a gap therebetween, the gap 25 is connected to the slit 24, to form a fluid channel to guide the liquid droplets flowed in from the slit 24 to a hollow part 26.
  • the pressure side plate 21 is provided with plural second slits 23 in the blade height direction on the upstream side of the slit 24 in a steam mainstream flow direction as shown in Fig. 3 .
  • the second slit 23 is formed through the pressure side plate 21 as shown in Fig. 5 .
  • the suction side plate 20 and the pressure side plate 21 are fixed in specified positions and the blade tail part 8 is formed in an integral construction by closing the piece holes 29 and 30 by welding or hard soldering after the attachment of the suction side plate 20, the pressure side plate 21 and the positioning piece 22.
  • the upper and lower ends of the blade tail part 8 are closed with a cover 33 respectively as shown in Fig. 3 , or directly welded to the outer peripheral side diaphragm 4 and the inner peripheral side diaphragm 6, so as to prevent leakage of the liquid droplets introduced from the second slit 23, the slit 24 and the gap 25.
  • the piece hole may be provided at a fixed interval in plural positions in the blade height direction between the slit 24 and the second slit 23 as shown in Fig. 3 .
  • the piece holes are provided in two positions on the blade outer peripheral side and in one position from the blade center to the inner peripheral side since the blade length is short. By fitting the positioning piece into the respective holes, it is possible to stably fix the suction side plate 20 and the pressure side plate 21.
  • the arrangement is not limited to the example shown in Fig. 3 as long as the suction side plate 20 and the pressure side plate 21 can be stably fixed.
  • the liquid film generated on the blade surface becomes unstable when the steam flow velocity is increased, and its part is surface-stripped and flies from the blade surface.
  • the slit 24 and the second slit processed and formed in the blade tail part 8 are provided in a part where the relative Weber number of the liquid film flow is 0.78.
  • Fig. 6 shows the thickness of the liquid film generated on the wall surface and the liquid film thickness (minimum liquid thickness for surface stripping) when the relative Weber number is 0.78.
  • the horizontal axis indicates a dimensionless distance obtained from a distance l measured along the blade surface from the airfoil leading edge 32 to the an arbitrary position of the blade surface shown in Fig. 4 , using a distance L measured along the blade surface from the airfoil leading edge end 32 to the trailing edge 28.
  • the minimum liquid thickness for surface stripping is thinner than the water film thickness generated on the blade surface, the liquid film cannot be deposited on the blade surface, and it is impossible to sufficiently eliminate the moisture content even with the slit.
  • the liquid film is generated in the downstream region of the slit 24, however, it is possible to eliminate 80% or more of the liquid film generated on the stationary blade surface with the above-described two slits.
  • the stationary blade is formed as a joint between the main body 5 having the hollow structure and the blade tail part 8.
  • the blade tail part 8 is formed by combining the metal plate on the suction side of airfoil (the airfoil suction-side metal plate) and the metal plate on the pressure side of airfoil (the airfoil pressure-side metal plate).
  • the airfoil suction-side metal plate and the airfoil pressure-side metal plate are not directly joined. It is possible to provide a slit in the vicinity of the blade trailing edge by inserting a spacer between the airfoil suction-side metal plate and the airfoil pressure-side metal plate and overlaying them so as to form a gap.
  • the pressure side plate slit-processed in the height direction is attached to the suction side plate forming the acute part at the trailing edge and the step part on one surface, so as to hold the positioning piece therebetween, to form space corresponding to the thickness of the positioning piece on the inner surface side of the suction side plate and the pressure side plate.
  • the gap is provided between the one side end surface of the pressure side plate and the step part of the suction side plate, and the suction side plate and the pressure side plate are attached so as to form the slit. It is possible to set the slit position immediately close to the trailing edge by providing the step part of the suction side plate in a position close to the trailing edge.
  • the structure of the present embodiment since it is possible to set the position of the slit to guide the liquid droplets deposited on the blade wall surface to the inside of the blade in a region of the minimum liquid thickness for surface stripping, it is possible to eliminate 80% of the liquid film generated on the stationary blade, to reduce erosive action on the moving blade by erosion, and improve the reliability.
  • the slit is not formed in the entire region in the stationary blade height direction, but limitedly in a region opposite to the tip part of the moving blade 2 shown in Fig. 1 .
  • the liquid film is eliminated with the slit 24 and the second slit 23, however, the steam is also sucked at the same time of the elimination of the liquid film.
  • the increment of the steam removal directly influences the degradation of the performance of the steam turbine. Further, the erosion amount by the liquid droplets flying from the stationary blade is increased in accordance with the increment of the circumferential velocity of the moving blade. Accordingly, the blade structure in the 70% or greater region in the blade height direction is formed with the joint body between the main body 5 and the blade tail part 8 shown in the embodiment 1.
  • the present embodiment it is possible to eliminate the liquid film in a region of large erosion amount, and reduce the steam removal in the slit, in addition, in a long blade such as a low-pressure turbine final-stage stationary blade, by limiting the region of the 2-body structure to 30% of the blade height direction, i.e., a part in the blade height direction where the liquid film particularly occurs, it is possible to easily manufacture the structure.
  • blade tail part 8 shown in Fig. 3 and Fig. 5 is formed using the positioning piece 22, however, the blade tail part 8 may be formed by precision casting.
  • Fig. 8 shows a cross-section of the stationary blade according to the third embodiment
  • Fig. 9 is an enlarged diagram of the blade tail part of the stationary blade shown in Fig. 8 .
  • the blade tail part 8 is not formed completely independently of the main body 5, but the member forming the blade surface of the main body 5 is extended and applied to the suction side plate 20 of the blade tail part 8. That is, on the suction side of airfoil, the main body 5 and the blade tail part 8 are formed with one metal plate.
  • the metal plates forming the main body 5 and the blade tail part 8 are separate bodies.
  • the pressure side plate 21 is overlaid on the step part 27 of the suction side plate 20 integrally formed with the main body 5 with a gap therebetween, and its one end is welded and fixed to the metal plate of the main body 5 on the pressure side of airfoil along the welding line 9.
  • the other end of the pressure side plate 21 has a gap with respect to the step part 27 of the suction side plate 20 integrally formed with the main body 5.
  • the slit 24 is formed by forming one wall of the slit with the end of the pressure side plate 21 and forming the other wall with the step part of the suction side plate. It is possible to form the slit 24 between the step part 27 of the suction side plate and the end of the pressure side plate 21 by providing the gap.
  • the method of joining the pressure side plate 21 with the positioning piece 22 to the suction side plate 20 is similar to the method shown in Fig. 3 .
  • the suction side plate of the blade tail part 8 and the metal plate of the main body 5 is one metal plate, it is possible to reduce the number of processing steps such as welding and member cutting and to reduce the erosive action on the moving blade by erosion at a lower cost.
  • Fig. 11 is a schematic perspective diagram of the stationary blade according to the present embodiment.
  • Fig. 12 is a cross-sectional diagram of an arbitrary cross section of a slit formation part in Fig. 11 .
  • the structure of the airfoil shown in Fig. 8 is applied to the structure of the airfoil in Fig. 11 .
  • the pressure side plate 21 of the blade tail part 8 is not formed as a separate member of the main body, but the member forming the blade surface of the main body is extended and applied.
  • the entire airfoil is previously formed by emboss-press processing one plate member.
  • the pressure side of airfoil is cut in a position sufficiently away from the leading edge, and the pressure side plate 21 is removed.
  • the blade plate member is cut in its thickness direction, to form the outer shape of the airfoil and a gap fluid channel part between the suction side and the pressure side of the blade inner surface.
  • a reinforcing rib 36 is fixed by welding or the like to the blade inner side of a cut-out part 35 of the pressure side plate 21 at the leading edge.
  • the pressure side plate 21 is fixed by welding on this rib.
  • the blade tail side of the pressure side plate 21 is fixed to the upstream side of the second slit 23 with the positioning piece provided between the slit 24 and the second slit 23.
  • the reinforcing rib 36 is provided with a vent hole 37 communicable with the hollow part 26 divided with the rib 36. By providing the vent hole 37, it is possible to uniform the pressure of the blade hollow part and to mitigate the load due to the pressure acting on the reinforcing rib 36.
  • the strength of the structure of the hollow blade is increased by providing the reinforcing rib 36 inside the blade.
  • Fig. 13 is a schematic perspective diagram of the stationary blade according to the present embodiment.
  • Fig. 14 is a cross-sectional diagram of an arbitrary cross section of the slit formation part of the stationary blade shown in Fig. 13 .
  • the positioning piece shown in Fig. 10 is used so as to fix the suction side plate and the pressure side plate and to ensure the size of the gap between the suction side plate and the pressure side plate.
  • a rib 40 formed inside the suction side plate is provided in place of the positioning piece.
  • a concave part forming a gap portion through which the water film flow sucked from the slit flows is formed by engraving.
  • the rib 40 is provided in a direction along the flow direction of the steam mainstream in plural positions in the concave member in the blade height direction.
  • a gap fluid channel having a width of the height of the rib 40 is formed between the suction side plate 20 and the pressure side plate 21 by joining the pressure side plate 21 to the rib 40 when the suction side plate 20 and the pressure side plate 21 are overlaid.
  • the pressure side plate 21 is provided so as to cover the rib 40 and is fixed by welding or the like. According to the present embodiment, the width of the gap fluid channel can be controlled by controlling the rib height.
  • the rib is provided on the inner surface of the suction side plate 20, however, it may be provided on the inner surface side of the pressure side plate 21.
  • the stationary blade shown in Fig. 13 is an example where in the stationary blade explained in the embodiment 2, the rib 40 of the present embodiment is applied in place of the positioning piece.
  • the rib 40 of the present embodiment in place of the positioning piece may be applied in the stationary blade of the embodiment 1, the embodiment 3 or the embodiment 4.
  • the present embodiment as in the case of the other embodiments, it is possible to set a position immediately close to the trailing edge as the slit position, to reduce the erosive action on the moving blade by erosion and to improve the reliability.
  • a part completely separated from the suction side plate and the pressure side plate such as the positioning piece is not required for formation of the gap fluid channel and joint between the suction side plate and the pressure side plate, it is possible to reduce the manufacturing cost of the hollow stationary blade by reduction of the number of assembly parts and reduction of the number of assembly steps.

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

Claims (9)

  1. Dampfturbinenleitschaufel (1), die einen Schlitz (24) in der Schaufelwandfläche aufweist, um Flüssigkeitströpfchen, die sich auf einer Schaufelwandfläche ablagern, in das Innere der Leitschaufel (1) zu leiten, wobei der Druck im Inneren der Leitschaufel (1) verringert ist, wobei
    die Leitschaufel (1) in einer hohlen Klingenform ausgebildet ist, die einen hohlen Teil (26) mit einer verformten Metallplatte besitzt,
    die Schaufelwandfläche an einem rückwärtigen Schaufelteil (8) der Leitschaufel (1) mit dem Schlitz (24) versehen ist und
    der Schlitz (24) in der Schaufelhöhenrichtung geöffnet ist, die durch Überlagern einer schaufelblattsogseitigen Metallplatte (20) und einer schaufelblattdruckseitigen Metallplatte (21) mit einem Spalt (25) dazwischen ausgebildet ist, und mit dem Spalt (25) verbunden ist, wobei der Spalt (25) einen Fluidkanal bildet, um die Flüssigkeitströpfchen, die aus dem Schlitz (24) einfließen, zu dem hohlen Teil (26) zu leiten,
    wobei die Dampfturbinenleitschaufel ferner gekennzeichnet ist durch zweite Schlitze (24), die in mehreren Positionen in einer Schaufelhöhenrichtung auf der in einer Hauptströmungsrichtung stromaufwärts gelegenen Seite des Schlitzes (24) vorgesehen sind, wobei
    die zweiten Schlitze (23) mit dem Spalt (25), der zwischen der schaufelblattsogseitigen Metallplatte (20) und der schaufelblattdruckseitigen Metallplatte (21) vorgesehen ist, verbunden sind.
  2. Dampfturbinenleitschaufel nach Anspruch 1, wobei
    der Schlitz (24) und die zweiten Schlitze (24) auf der Druckseite des Schaufelblattes vorgesehen sind, und
    die zweiten Schlitze (23) an einer Position in einem Bereich von 0,65 bis 0,75 als I/L-Verhältnis zwischen einem Abstand I in Richtung einer Schaufelfläche von dem Schaufelblattanströmkantenende (32) der Leitschaufel zu einer beliebigen Position an der Schaufeloberfläche und einem Abstand L entlang der Schaufeloberfläche von dem Schaufelblattanströmkantenende (32) zu der Abströmkante (28) der Leitschaufel vorgesehen sind und der Schlitz (24) an einer Position in einem Bereich des I/L-Verhältnisses von 0,75 bis 0,9 vorgesehen ist.
  3. Dampfturbinenleitschaufel nach einem der Ansprüche 1 bis 2, die ferner Folgendes enthält:
    ein Paar Teillöcher (29, 30), die in der schaufelblattsogseitigen Metallplatte (20) und der schaufelblattdruckseitigen Metallplatte (21) vorgesehen sind;
    einen Positionierungsteil (22), der einen Abstandshalter (31), der zwischen der schaufelblattsogseitigen Metallplatte (20) und der schaufelblattdruckseitigen Metallplatte (21) gehalten wird, um einen Spalt (25) zu bilden, und ein konvexes Element (34), das an beiden Enden des Abstandshalters (31) vorgesehen und in die Teillöcher (29, 30) eingesetzt ist, besitzt, um die gegenseitigen Positionen der schaufelblattsogseitigen Metallplatte (20) und der schaufelblattdruckseitigen Metallplatte (21) zu festzulegen; und
    einen Stufenteil (27), der an der Schaufelinnenflächenseite der schaufelblattsogseitigen Metallplatte (20) und an dem abströmkantenseitigen Ende der schaufelblattdruckseitigen Metallplatte (21) mit einem Spalt dazwischen vorgesehen ist, um den Schlitz (24) zu bilden.
  4. Dampfturbinenleitschaufel nach einem der Ansprüche 1 bis 3, wobei die schaufelblattsogseitige Metallplatte (20) bzw. die schaufelblattdruckseitige Metallplatte (21) mit einer von der Metallplatte, die den Hauptkörper (5) der Leitschaufel bildet, getrennten Metallplatte gebildet sind.
  5. Dampfturbinenleitschaufel nach Anspruch 4, wobei die schaufelblattsogseitige Metallplatte (20) bzw. die schaufelblattdruckseitige Metallplatte (21) bei einem Teil eines Bereichs an der Außenumgangsseite in der Leitschaufelhöhenrichtung mit der von der Metallplatte, die den Hauptkörper (5) der Leitschaufel bildet, getrennten Metallplatte gebildet sind.
  6. Dampfturbinenleitschaufel nach einem der Ansprüche 1 bis 3, wobei
    die schaufelblattsogseitige Metallplatte (20) mit demselben Element, wie die Metallplatte, die den Hauptkörper (5) der Leitschaufel bildet, gebildet ist und
    die schaufelblattdruckseitige Metallplatte (21) mit einem von der Metallplatte, die den Hauptkörper (5) der Leitschaufel bildet, getrennten Element gebildet ist.
  7. Dampfturbinenleitschaufel nach Anspruch 6, wobei die Leitschaufel in dem hohlen Teil (26) der Schaufel eine Verstärkungsrippe (36) besitzt, um einen zwischen der Metallplatte, die den Hauptkörper (5) der Leitschaufel bildet, und der schaufelblattdruckseitigen Metallplatte (21) geschweißten Teil zu verstärken, wobei
    die Verstärkungsrippe (36) eine Entlüftungsöffnung (37) besitzt, um die Schaufelhohlteile, die durch die Verstärkungsrippe (36) in zwei Abschnitte unterteilt werden, zu verbinden.
  8. Dampfturbinenleitschaufel nach einem der Ansprüche 1 bis 7, die ferner eine Rippe (40) enthält, die an der Schaufelinnenseitenfläche der schaufelblattsogseitigen Metallplatte (20) oder der schaufelblattdruckseitigen Metallplatte (21) gebildet ist,
    wobei die schaufelblattsogseitige Metallplatte (20) und die schaufelblattdruckseitige Metallplatte (21) über die Rippe (40) verbunden sind.
  9. Dampfturbine, die eine Turbinenstufe enthält, die eine Dampfturbinenleitschaufel nach einem der Ansprüche 1 bis 8 und eine Laufschaufel (2), die auf der in einer Arbeitsfluiddurchflussrichtung stromabwärts gelegenen Seite der Dampfturbinenleitschaufel (1) vorgesehen ist, besitzt.
EP13178438.1A 2012-07-30 2013-07-30 Leitschaufel einer Dampfturbine und zugehörige Dampfturbine Active EP2692990B1 (de)

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JP6230383B2 (ja) 2013-11-21 2017-11-15 三菱日立パワーシステムズ株式会社 蒸気タービンの静翼と蒸気タービン
JP6393178B2 (ja) * 2014-12-15 2018-09-19 三菱日立パワーシステムズ株式会社 蒸気タービン静翼
US11486255B2 (en) 2017-09-05 2022-11-01 Mitsubishi Heavy Industries, Ltd. Steam turbine blade, steam turbine, and method for manufacturing steam turbine blade
EP3591175A1 (de) * 2018-07-02 2020-01-08 Siemens Aktiengesellschaft Ausgangöffnung einer dampfturbine
JP7179652B2 (ja) * 2019-02-27 2022-11-29 三菱重工業株式会社 タービン静翼、及び蒸気タービン
JP7179651B2 (ja) * 2019-02-27 2022-11-29 三菱重工業株式会社 タービン静翼、及び蒸気タービン
JP7293011B2 (ja) * 2019-07-10 2023-06-19 三菱重工業株式会社 蒸気タービン用静翼、蒸気タービン及び蒸気タービン用静翼の加熱方法
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Publication number Publication date
EP2692990A2 (de) 2014-02-05
CN103628929B (zh) 2016-01-13
EP2692990A3 (de) 2015-04-22
CN103628929A (zh) 2014-03-12
US20140030065A1 (en) 2014-01-30
JP2014025443A (ja) 2014-02-06
JP5919123B2 (ja) 2016-05-18

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