JP5881355B2 - Stator blades and steam turbines - Google Patents

Stator blades and steam turbines Download PDF

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JP5881355B2
JP5881355B2 JP2011211044A JP2011211044A JP5881355B2 JP 5881355 B2 JP5881355 B2 JP 5881355B2 JP 2011211044 A JP2011211044 A JP 2011211044A JP 2011211044 A JP2011211044 A JP 2011211044A JP 5881355 B2 JP5881355 B2 JP 5881355B2
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edge portion
stationary blade
spring member
ventral
end side
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JP2013072333A (en
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山下　洋行
洋行 山下
大山　宏治
宏治 大山
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Mitsubishi Power Ltd
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Mitsubishi Hitachi Power Systems Ltd
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Priority to PCT/JP2012/074713 priority patent/WO2013047587A1/en
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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
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • 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
    • 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
    • F01D5/16—Form or construction for counteracting blade vibration
    • 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

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

Description

本発明は、蒸気タービンに用いられる静翼、及びこの静翼を備えた蒸気タービンに関する。   The present invention relates to a stationary blade used in a steam turbine, and a steam turbine including the stationary blade.

近年、軽量化を図るために、内部を中空構造とした静翼を備えた蒸気タービンが知られている。
また、静翼の性能向上を図るために、静翼の内部と外部とを連通させるスリットを設け、静翼の表面に付着した水滴を内部に取り込んで除去する技術が提案されている（例えば、特許文献１参照）。このように内部に取り込まれた水は、静翼と結合されているシュラウドに向けて流されて排出される。 In recent years, a steam turbine including a stationary blade having a hollow structure in order to reduce weight has been known.
In addition, in order to improve the performance of the stationary blade, a technology has been proposed in which a slit is provided to communicate the interior and exterior of the stationary blade, and water droplets attached to the surface of the stationary blade are taken in and removed (for example, Patent Document 1). The water thus taken into the interior is discharged toward the shroud connected to the stationary blade and discharged.

このような蒸気タービンの静翼には、その外装形状（幾何学的形状）や質量、タービン作動時における静翼周囲の環境（例えば、静翼を通過する蒸気の流速や質量等）に応じて、自励振動（フラッタ）が生じることがある。特に、静翼の質量が小さい場合や、翼高さが長い場合に、自励振動が生じ易くなってしまうことが知られている。
さらに、内部を中空構造とした静翼（以下、「中空静翼」と称する）は、内部を中実構造とした静翼（以下、「中実静翼」と称する）に比べて軽量なものとなる。よって、中空静翼には、中実静翼に比べて自励振動が生じ易いことから、これを抑制する必要が生じる。 Depending on the outer shape (geometric shape) and mass of the steam blades of such a steam turbine, the environment around the stator blades during turbine operation (for example, the flow velocity and mass of the steam passing through the stator blades) Self-excited vibration (flutter) may occur. In particular, it is known that self-excited vibration is likely to occur when the mass of the stationary blade is small or when the blade height is long.
Furthermore, a stationary blade having a hollow structure inside (hereinafter referred to as “hollow stationary blade”) is lighter than a stationary blade having a solid structure inside (hereinafter referred to as “solid stationary blade”). It becomes. Therefore, since the self-excited vibration is more likely to occur in the hollow stationary blade than in the solid stationary blade, it is necessary to suppress this.

このような自励振動を抑制するため、中空静翼の内部に減衰機構（ダンパ）を設けることで、静翼に生じた振動を減衰させる技術も提案されている（例えば、特許文献２参照）。   In order to suppress such self-excited vibration, a technique for attenuating vibration generated in the stationary blade by providing a damping mechanism (damper) inside the hollow stationary blade has been proposed (for example, see Patent Document 2). .

図７は、このような減衰構造を設けた静翼の一例を示し、図７（Ａ）は静翼の要部の横断面図、図７（Ｂ）は静翼の要部の側面図である。   FIG. 7 shows an example of a stationary blade provided with such a damping structure. FIG. 7A is a cross-sectional view of the main part of the stationary blade, and FIG. 7B is a side view of the main part of the stationary blade. is there.

図において、静翼１は、主に腹側を構成する腹側部材２と、主に背側を構成する背側部材３とを有している。また、腹側部材２と背側部材３とは、それぞれ金属製の板状部材を湾曲することで構成されており、その両縁付近が互いに溶接により接合されている。腹側部材２は、表面側が静翼１の腹面４をとなるように反りが形成されている。また、背側部材３は、表面側が静翼１の背面５となるように反りが形成されている。さらに、腹側部材２と背側部材３とは、その反りを異ならせることによって内部を中空構造とし、その内部に空洞部６を形成している。   In the figure, the stationary blade 1 has a ventral member 2 mainly constituting the ventral side and a dorsal member 3 mainly constituting the dorsal side. The abdominal member 2 and the dorsal member 3 are each configured by bending a metal plate-like member, and both edges thereof are joined to each other by welding. The abdomen side member 2 is warped so that the surface side becomes the abdomen surface 4 of the stationary blade 1. Further, the back member 3 is warped so that the surface side is the back surface 5 of the stationary blade 1. Further, the abdominal member 2 and the back member 3 have a hollow structure by making their warpage different, and a cavity 6 is formed in the interior.

空洞部６には、その中央部分を基部７ａとして腹側部材２の裏面２ａに溶接固定された弓形板バネ７が設けられている。また、空洞部６は、例えば、腹側部材２に形成されたスリット２ｂ，２ｃによって、静翼１の内部（空洞部６）と外部とが連通され、静翼１の表面に付着した水滴を内部に取り込んで除去するようにしている。   The hollow portion 6 is provided with an arcuate leaf spring 7 which is welded and fixed to the back surface 2a of the ventral member 2 with the central portion as a base portion 7a. In addition, the hollow portion 6 is formed by, for example, slits 2 b and 2 c formed in the ventral member 2 so that the inside (cavity portion 6) and the outside of the stationary blade 1 communicate with each other, and water droplets attached to the surface of the stationary blade 1 are removed. It is taken in and removed.

弓形板バネ７は、基部７ａから端部７ｂ，７ｃとの間に、腹側部材２から背側部材３に向う傾斜接続部７ｄ，７ｅを形成し、端部７ｂ，７ｃを背側部材３の裏面３ｃに当接させている。   The arcuate leaf spring 7 is formed with inclined connection portions 7d and 7e from the base portion 7a to the end portions 7b and 7c toward the back side member 3 from the abdominal side member 2, and the end portions 7b and 7c are connected to the back side member 3. It is made to contact | abut to the back surface 3c.

特開平１１−３３６５０３号公報Japanese Patent Laid-Open No. 11-336503 特開２００８−１３３８２５号公報JP 2008-133825 A

ところで、上述のような弓形板バネ７を用いた静翼１にあっては、弓形板バネ７の中央部分を基部７ａとし、その両端を背側部材３の裏面３ｃに当接させていることから、そのバネ圧は静翼１の蒸気入口側（矢印Ｑで蒸気の流入方向を示す）と出口側の両方に加わるように設定されている。なお、蒸気入口側は静翼１の整流方向上流側、蒸気出口側は静翼１の整流方向下流側となる。   By the way, in the stationary blade 1 using the arched leaf spring 7 as described above, the central portion of the arched leaf spring 7 is the base portion 7a, and both ends thereof are in contact with the back surface 3c of the back side member 3. Therefore, the spring pressure is set so as to be applied to both the steam inlet side (indicated by the arrow Q) of the stationary blade 1 and the outlet side. The steam inlet side is the upstream side of the stationary blade 1 in the rectifying direction, and the steam outlet side is the downstream side of the stationary blade 1 in the rectifying direction.

一方、蒸気タービンの運転時の静翼１は、蒸気出口側が捩れる振動モードとなるため、ダンパ機能はできるだけ蒸気出口側に集中することが望ましい。   On the other hand, since the stationary blade 1 during operation of the steam turbine is in a vibration mode in which the steam outlet side is twisted, it is desirable that the damper function be concentrated on the steam outlet side as much as possible.

しかしながら、上述した弓形板バネ７にあっては、静翼１の蒸気入口側と出口側の双方に略同じ面積で裏面３ｃに当接していることから、蒸気出口側に必要なだけのダンパ機能を十分に付与することができず、静翼１全体として十分な減衰性能を得ることができないという問題が生じていた。また、蒸気入口側と出口側との減衰機能がアンバランスとなると、不十分な減衰に伴う振動の発生によって両端７ｂ，７ｃと裏面３ｃとの当接状態が点接触や線接触となり易く、当接面積が確保されずにさらなる振動の発生要因となるという問題が生じていた。   However, since the bow leaf spring 7 described above is in contact with the back surface 3c with substantially the same area on both the steam inlet side and the outlet side of the stationary blade 1, only a necessary damper function is provided on the steam outlet side. Cannot be sufficiently provided, and there has been a problem that sufficient damping performance cannot be obtained as a whole of the stationary blade 1. Also, if the damping function between the steam inlet side and the outlet side is unbalanced, the contact state between the both ends 7b, 7c and the back surface 3c is likely to be point contact or line contact due to generation of vibration due to insufficient damping. There was a problem that the contact area could not be secured, causing further vibration.

しかも、弓形板バネ７にあっては、両端７ｂ，７ｃの二ヶ所を裏面３ｃに当接させていることから、板バネ全体が大型化するばかりでなく、中央部分の基部７ａを含む三ヶ所を裏面２ａ，３ｃに面接触させる必要が生じることと相俟って、静翼１の外装形状や質量ごとにバネ圧や形状等を変更する専用品となってしまい、共用化が困難で汎用性に劣るという問題も生じていた。 Moreover, in the bow-shaped leaf spring 7, since the two ends 7b and 7c are brought into contact with the back surface 3c, not only the whole leaf spring is increased in size but also the three portions including the base portion 7a of the central portion. the I backside 2a, 3 that need to surface contact occurs c coupled with, becomes a dedicated article to change the spring pressure, shape, etc. for each exterior shape and mass of the stationary blade 1, it is difficult to sharing There was also a problem that it was inferior in versatility.

本発明は、このような課題に鑑みてなされたものであって、簡素な構成で自励振動抑制すると共に、その減衰機能を容易に確保することができ、しかも、汎用性を向上させることができる静翼及び蒸気タービンを提供することを目的とする。   The present invention has been made in view of such problems, and can suppress self-excited vibration with a simple configuration, easily ensure its damping function, and improve versatility. It is an object of the present invention to provide a stationary vane and a steam turbine that can be used.

上記課題を解決するため、本発明は以下の手段を提案している。
即ち、本発明に係る静翼は、前縁部分と後縁部分において接合される腹側部材と背側部材の各裏面によって空洞部が画成された静翼本体と、前記空洞部に配置される背側板状バネ部材と、を有する静翼において、前記腹側部材の翼高さ方向断面は、前記前縁部分から前記後縁部分にかけて小さい曲率の湾曲をなし、前記背側部材の翼高さ方向断面は、前記前縁部分において大きい曲率で湾曲したあと前記後縁部分にかけて前記腹側部材よりも小さい曲率の湾曲をなし、前記背側板状バネ部材の一端側の縁部は、前記前縁部分において、前記腹側部材の前記裏面に固定され、前記背側板状バネ部材の他端側は、翼形中心線の中央よりも前記前縁部分側から前記後縁部分にかけて、前記背側部材の前記裏面との摺接面を有し、前記背側板状バネ部材の一端側と他端側とは、前記摺接面に押圧力を付与する接続部で接続されている、ことを特徴とする。
または、前縁部分と後縁部分において接合される腹側部材と背側部材の各裏面によって空洞部が画成された静翼本体と、前記空洞部に配置される腹側板状バネ部材と、を有する静翼において、前記腹側部材の翼高さ方向断面は、前記前縁部分から前記後縁部分にかけて小さい曲率の湾曲をなし、前記背側部材の翼高さ方向断面は、前記前縁部分において大きい曲率で湾曲したあと前記後縁部分にかけて前記腹側部材よりも小さい曲率の湾曲をなし、前記腹側板状バネ部材の一端側の縁部は、前記前縁部分において、前記背側部材の前記裏面に固定され、前記腹側板状バネ部材の他端側は、翼形中心線の中央よりも前記前縁部分側から前記後縁部分にかけて、前記腹側部材の前記裏面との摺接面を有し、前記腹側板状バネ部材の一端側と他端側とは、前記摺接面に押圧力を付与する接続部で接続されている、ことを特徴とする。
さらには、前縁部分と後縁部分において接合される腹側部材と背側部材の各裏面によって空洞部が画成された静翼本体と、 前記空洞部に配置される背側板状バネ部材及び腹側板状バネ部材と、を有する静翼において、前記腹側部材の翼高さ方向断面は、前記前縁部分から前記後縁部分にかけて小さい曲率の湾曲をなし、前記背側部材の翼高さ方向断面は、前記前縁部分において大きい曲率で湾曲したあと前記後縁部分にかけて前記腹側部材よりも小さい曲率の湾曲をなし、前記背側板状バネ部材の一端側の縁部は、前記前縁部分において、前記腹側部材の前記裏面に固定され、前記背側板状バネ部材の他端側は、翼形中心線の中央よりも前記前縁部分側から前記後縁部分にかけて、前記背側部材の前記裏面との摺接面を有し、前記背側板状バネ部材の一端側と他端側とは、前記摺接面に押圧力を付与する接続部で接続されており、前記腹側板状バネ部材の一端側の縁部は、前記前縁部分において、前記背側部材の前記裏面に固定され、前記腹側板状バネ部材の他端側は、翼形中心線の中央よりも前記前縁部分側から前記後縁部分にかけて、前記腹側部材の前記裏面との摺接面を有し、前記腹側板状バネ部材の一端側と他端側とは、前記摺接面に押圧力を付与する接続部で接続されている、ことを特徴とする。
加えて、前記前縁部分の前記腹側部材と前記背側部材が接合される部分の翼高さ方向断面が、曲線で構成されていることを特徴とする。 In order to solve the above problems, the present invention proposes the following means.
That is, the stationary blade according to the present invention, before and stationary blade body cavity is defined by the rear surface of the flank member and dorsal member to be bonded in the edge portion and trailing edge portion, said cavity in stationary blade having a dorsal plate spring member that will be positioned, a blade height direction cross section of the ventral member, a curved small curvature toward the trailing edge portion from said front edge portion, the back-side member The blade height direction cross section of the front edge portion is curved with a large curvature at the front edge portion and then curved toward the rear edge portion with a smaller curvature than the ventral member, and the edge portion on one end side of the dorsal plate spring member is The front edge portion is fixed to the back surface of the ventral member, and the other end side of the back plate spring member is from the front edge portion side to the rear edge portion rather than the center of the airfoil center line. The back plate spring portion has a sliding contact surface with the back surface of the back member. The one end and the other end of the said sliding contact surface are connected by the connecting portion for applying a pressing force to, characterized in that.
Alternatively, a stationary blade body in which a cavity is defined by the back surfaces of the ventral member and the back member joined at the front edge part and the rear edge part, and a ventral plate spring member disposed in the cavity part, The blade height direction cross section of the ventral member has a small curvature curve from the front edge portion to the rear edge portion, and the blade height direction cross section of the back side member is the front edge. After bending with a large curvature in the part, the curved part having a smaller curvature than the ventral member is formed over the rear edge part, and the edge part on the one end side of the ventral plate-like spring member is the back side member at the front edge part. The other end side of the ventral plate spring member is slidably contacted with the back surface of the ventral member from the front edge portion side to the rear edge portion rather than the center of the airfoil center line. One end side and the other end side of the ventral plate spring member , The sliding contact surface are connected by the connecting portion for applying a pressing force to, characterized in that.
Furthermore, a stationary blade body in which a cavity is defined by the back surfaces of the abdominal member and the back member joined at the front edge portion and the rear edge portion, a back plate spring member disposed in the cavity portion, and A stationary blade having a ventral plate-like spring member, wherein the blade height direction cross section of the ventral member has a small curvature from the front edge portion to the rear edge portion, and the blade height of the back member A cross section in a direction is curved with a large curvature at the front edge portion and then curved with a smaller curvature than the ventral member over the rear edge portion, and an edge on one end side of the dorsal plate spring member is the front edge In the portion, the back side member is fixed to the back surface of the abdominal side member, and the other end side of the back side plate spring member extends from the front edge portion side to the rear edge portion rather than the center of the airfoil center line. Having a sliding contact surface with the back surface, and the back plate-like bar One end side and the other end side of the net member are connected by a connection portion that applies a pressing force to the sliding contact surface, and an edge portion on one end side of the abdominal plate spring member is the front edge portion, The back surface of the ventral member is fixed to the back surface of the back member, and the other end side of the ventral plate spring member extends from the front edge portion side to the trailing edge portion rather than the center of the airfoil center line. The one end side and the other end side of the abdominal plate spring member are connected to each other by a connecting portion that applies a pressing force to the sliding contact surface.
In addition, the blade height direction cross section of the portion where the abdomen side member and the back side member of the front edge portion are joined is configured by a curve.

このような構成によれば、簡素な構成で自励振動抑制すると共に、その減衰機能を容易に確保することができ、しかも、汎用性を向上することができる。   According to such a configuration, the self-excited vibration can be suppressed with a simple configuration, the damping function can be easily secured, and versatility can be improved.

また、本発明に係る静翼においては、前記背側板状バネ部材の前記接続部は、前記背側板状バネ部材の一端側と他端側を接続するように、前記腹側部材の前記裏面から前記背側部材の前記裏面に向かうに従って漸次前記後縁部分側に延在することを特徴とする。
または、前記腹側板状バネ部材の前記接続部は、前記腹側板状バネ部材の一端側と他端側を接続するように、前記背側部材の前記裏面から前記腹側部材の前記裏面に向かうに従って漸次前記後縁部分側に延在することを特徴とする。 In the stationary blade according to the present invention, the connecting portion of the back plate-like spring member is connected to the one end side and the other end side of the back plate-like spring member from the back surface of the ventral member. It is characterized by gradually extending toward the rear edge portion side toward the back surface of the back side member .
Or the said connection part of the said belly side plate-shaped spring member goes to the said back surface of the said belly side member from the said back surface of the said back side member so that the one end side and other end side of the said belly side plate spring member may be connected. And gradually extending toward the trailing edge portion.

このような構成によれば、板状バネ部材のバネ圧を容易に設定することができる。   According to such a configuration, the spring pressure of the plate spring member can be easily set.

さらに、本発明に係る静翼においては、前記背側板状バネ部材の他端側は、前記背側部材の前記裏面の前記後縁部分側の端部付近に至るまで該裏面に添って延びていることを特徴とする。
または、前記腹側板状バネ部材の他端側は、前記腹側部材の前記裏面の前記後縁部分側の端部付近に至るまで該裏面に添って延びていることを特徴とする。 Furthermore, in the stationary blade according to the present invention, the other end side of the back plate-like spring member extends along the back surface until it reaches the vicinity of the end portion of the back surface of the back member on the rear edge portion side. It is characterized by being.
Alternatively, the other end side of the abdominal plate spring member extends along the back surface to the vicinity of the end portion of the back surface of the abdominal member on the rear edge portion side.

このような構成によれば、静翼本体の下流側の端部、即ち、静翼本体の整流方向下流側の自動振動抑制効果を容易に確保することができる。   According to such a configuration, it is possible to easily ensure the automatic vibration suppressing effect on the downstream end of the stationary blade body, that is, on the downstream side in the rectification direction of the stationary blade body.

また、本発明の蒸気タービンは、上記静翼が、ロータ軸の周方向に所定の間隔で配列されていることを特徴とする。   The steam turbine of the present invention is characterized in that the stationary blades are arranged at predetermined intervals in the circumferential direction of the rotor shaft.

このような構成によれば、簡素な構成で自励振動抑制すると共に、その減衰機能を容易に確保することができ、しかも、汎用性を向上することができる。   According to such a configuration, the self-excited vibration can be suppressed with a simple configuration, the damping function can be easily secured, and versatility can be improved.

さらに、本発明に係る蒸気タービンにおいては、前記静翼本体に、表面側から前記空洞部の内部へと水滴を案内するスリットが形成されていることを特徴とする。   Furthermore, in the steam turbine according to the present invention, a slit for guiding water droplets from the surface side to the inside of the cavity is formed in the stationary blade body.

このような構成によれば、静翼本体の表面に付着した水滴を空洞部に取り込んで除去することができる。   According to such a configuration, water droplets adhering to the surface of the stationary blade body can be taken into the cavity and removed.

本発明の静翼及び蒸気タービンによれば、簡素な構成で自励振動抑制すると共に、その減衰機能を容易に確保することができ、しかも、汎用性を向上することができる。   According to the stator blade and the steam turbine of the present invention, the self-excited vibration can be suppressed with a simple configuration, the damping function can be easily secured, and versatility can be improved.

本発明の一実施形態に係る静翼を搭載した蒸気タービンを示し、蒸気タービンの概略構成の説明図である。BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the schematic structure of a steam turbine, which shows the steam turbine carrying the stationary blade which concerns on one Embodiment of this invention. 本発明の一実施形態に係る蒸気タービンを示し、蒸気タービンを低圧最終段側から見た要部の外観斜視図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of a main part of a steam turbine according to an embodiment of the present invention, as viewed from the low-pressure final stage side. 本発明の一実施形態に係る静翼を示し、静翼を背側から見た拡大図である。It is the enlarged view which showed the stationary blade which concerns on one Embodiment of this invention, and looked at the stationary blade from the back side. 本発明の一実施形態に係る静翼を示し、（Ａ）は静翼の翼形を示す断面図、（Ｂ）は板状バネ部材の断面図である。The stator blade which concerns on one Embodiment of this invention is shown, (A) is sectional drawing which shows the airfoil of a stationary blade, (B) is sectional drawing of a plate-shaped spring member. 本発明の一実施形態に係る変形例１の静翼を示し、（Ａ）は静翼の翼形を示す断面図、（Ｂ）は板状バネ部材の断面図である。The stator blade of the modification 1 which concerns on one Embodiment of this invention is shown, (A) is sectional drawing which shows the airfoil of a stationary blade, (B) is sectional drawing of a plate-shaped spring member. 本発明の一実施形態に係る変形例２の静翼を示し、静翼の翼形を示す断面図である。It is sectional drawing which shows the stationary blade of the modification 2 which concerns on one Embodiment of this invention, and shows the airfoil of a stationary blade. 従来の静翼を示し、（Ａ）は静翼の翼形を示す断面図、（Ｂ）は静翼の要部の側面図である。A conventional stator blade is shown, (A) is a sectional view showing an airfoil shape of the stator blade, and (B) is a side view of a main part of the stator blade.

次に、本発明の一実施形態に係る静翼及び蒸気タービンについて、図面を参照して説明する。尚、以下に示す実施例は本発明の静翼及び蒸気タービンにおける好適な具体例であり、技術的に好ましい種々の限定を付している場合もあるが、本発明の技術範囲は、特に本発明を限定する記載がない限り、これらの態様に限定されるものではない。また、以下に示す実施形態における構成要素は適宜、既存の構成要素等との置き換えが可能であり、かつ、他の既存の構成要素との組合せを含む様々なバリエーションが可能である。したがって、以下に示す実施形態の記載をもって、特許請求の範囲に記載された発明の内容を限定するものではない。   Next, a stationary blade and a steam turbine according to an embodiment of the present invention will be described with reference to the drawings. The following examples are preferred specific examples of the stationary blades and steam turbines of the present invention, and may have various technically preferable limitations. However, the technical scope of the present invention is particularly limited to the present invention. Unless stated to limit the invention, it is not limited to these embodiments. In addition, the constituent elements in the embodiments shown below can be appropriately replaced with existing constituent elements and the like, and various variations including combinations with other existing constituent elements are possible. Therefore, the description of the embodiment described below does not limit the contents of the invention described in the claims.

図１は本発明の一実施形態に係る静翼を搭載した蒸気タービンの概略構成を模式的に示す説明図、図２は本発明の一実施形態を示す蒸気タービンを低圧最終段側から見た要部の外観斜視図、図３は本発明の一実施形態を示す静翼を背側から見た拡大図、図４は本発明の静翼を示し、図４（Ａ）は静翼の翼形を示す断面図、図４（Ｂ）は板状バネ部材の断面図である。   FIG. 1 is an explanatory view schematically showing a schematic configuration of a steam turbine equipped with a stationary blade according to an embodiment of the present invention, and FIG. 2 is a view of the steam turbine showing an embodiment of the present invention from the low-pressure final stage side. FIG. 3 is an enlarged perspective view of a stationary blade showing an embodiment of the present invention viewed from the back side, FIG. 4 shows the stationary blade of the present invention, and FIG. 4 (A) is a blade of the stationary blade. FIG. 4B is a cross-sectional view of a plate-like spring member.

図１に示すように、本実施例に係る蒸気タービン１０は、例えば、原子力発電プラント等で用いられる低圧蒸気タービンであり、高圧の蒸気を発生する蒸気発生器１１と、蒸気発生器１１から高圧の蒸気が直接供給される高圧蒸気タービン１２と、蒸気発生器１１及び高圧蒸気タービン１２からの蒸気の湿分を分離して加熱する湿分分離加熱器１３と、湿分分離加熱器１３から低圧の蒸気が供給される蒸気タービン１０が設けられている。以降、本実施の形態では、蒸気タービン１０として湿分分離加熱器１３から蒸気の供給を受ける低圧蒸気タービンについて説明する。   As shown in FIG. 1, a steam turbine 10 according to the present embodiment is a low-pressure steam turbine used in, for example, a nuclear power plant, and a steam generator 11 that generates high-pressure steam and a high-pressure from the steam generator 11. The high pressure steam turbine 12 to which the steam of the steam is directly supplied, the moisture separation heater 13 for separating and heating the steam moisture from the steam generator 11 and the high pressure steam turbine 12, and the low pressure from the moisture separation heater 13 A steam turbine 10 is provided. Hereinafter, in the present embodiment, a low-pressure steam turbine that receives supply of steam from the moisture separator 13 as the steam turbine 10 will be described.

蒸気タービン１０において、湿分分離加熱器１３からの蒸気は、蒸気入口１４に供給されて該蒸気タービン１０に形成されている蒸気通路１５をロータ軸１６の軸方向（図中、矢印Ａで示す）に沿って流通する。蒸気通路１５には、動翼１７と静翼１８が交互に配置されており、蒸気タービン１０は、静翼１８での圧力降下によって運動エネルギを生じさせ、これを動翼１７によって回転トルクに変換している。これにより、動翼１７を結合したロータ軸１６は、動翼１７で変換した回転トルクによって回転する。   In the steam turbine 10, steam from the moisture separation heater 13 is supplied to the steam inlet 14, and the steam passage 15 formed in the steam turbine 10 is indicated in the axial direction of the rotor shaft 16 (indicated by an arrow A in the figure). ) To distribute. In the steam passage 15, the moving blades 17 and the stationary blades 18 are alternately arranged, and the steam turbine 10 generates kinetic energy by the pressure drop in the stationary blades 18, and this is converted into rotational torque by the moving blades 17. doing. As a result, the rotor shaft 16 coupled with the moving blade 17 rotates by the rotational torque converted by the moving blade 17.

静翼１８は、図１〜図３に示すように、ロータ軸１６の径方向（図中、矢印Ｒで示す）の内側端１８ａがシュラウド１９に、径方向の外側端１８ｂが翼根リング２０に、それぞれ溶接により結合されている（図３に溶接部を符号２１で示す）。   As shown in FIGS. 1 to 3, the stationary blade 18 has an inner end 18 a in the radial direction (indicated by an arrow R in the drawing) of the rotor shaft 16 at the shroud 19 and an outer end 18 b in the radial direction at the blade root ring 20. Are connected by welding (the welded portion is indicated by reference numeral 21 in FIG. 3).

動翼１７と静翼１８とは、図１に示すように、一対となって一つの段２２が必要に応じた数だけ配置されている。また、段２２は、蒸気通路１５を上流側から下流側に向かうに従って、動翼１７及び静翼１８の翼高さが長くなるよう構成されている。蒸気通路１５の最も下流側にある段２２を「低圧最終段」という。低圧最終段２２の静翼１８は、上流側の段２２にある静翼１８に比べて、特に翼高さが長いものとなっている。低圧最終段２２において、静翼１８は、図２及び図３に示すように、ロータ軸１６の周方向（図中、矢印Ｐで示す）に所定の間隔で複数配列されており、翼群２３を形成している。 As shown in FIG. 1, the moving blade 17 and the stationary blade 18 are paired and one step 22 is arranged as many as necessary. Further, the stage 22 is configured such that the blade heights of the moving blade 17 and the stationary blade 18 become longer as the steam passage 15 moves from the upstream side to the downstream side. The stage 22 on the most downstream side of the steam passage 15 is referred to as a “low pressure final stage”. The stationary blade 18 of the low-pressure final stage 22 has a particularly long blade height compared to the stationary blade 18 in the upstream stage 22. In the low-pressure final stage 22, a plurality of stationary blades 18 are arranged at a predetermined interval in the circumferential direction of the rotor shaft 16 (indicated by an arrow P in the figure) as shown in FIGS. Is forming.

静翼１８は、図４（Ａ）に示すように、主に腹側を構成する腹側部材２４と、主に背側を構成する背側部材２５と、を備えている。腹側部材２４と背側部材２５とは、それぞれ金属製の板状部材を、互いに異なる反り方で湾曲させたもので、それぞれ金属製の板状部材を互いに異なる反り方で湾曲させ、その両縁付近を縁部に沿って互いに溶接により接合することで、その静翼本体としての外装形状が形成される。なお、本実施の形態においては、蒸気の入口側に位置する前縁部分（矢印Ｑで蒸気の流入方向を示す）はＴＩＧ溶接（符合２６）、蒸気の出口側に位置する後縁部分はレーザ溶接（符合２７）によって接合されている。腹側部材２４は、表面側が静翼１８の腹面２８をとなるように反りが形成されている。また、背側部材２５は、表面側が静翼１８の背面２９となるように反りが形成されている。さらに、腹側部材２４と背側部材２５とは、その反りの曲率を異ならせることによって内部を中空構造として空洞部３０を形成している。すなわち、腹側部材２４の裏面２４ｃと背側部材２５の裏面２５ａとの間には、翼高さ方向（ロータ軸１６の径方向）に沿って延びる空洞部３０が形成される。また、静翼１８の内部には、腹側部材２４の裏面２４ｃと背側部材２５の裏面２５ａとにより、翼内面が形成されることになる。なお、蒸気入口側は静翼１８の整流方向上流側、蒸気出口側は静翼１８の整流方向下流側となる。 As shown in FIG. 4A, the stationary blade 18 includes a ventral member 24 that mainly configures the ventral side, and a dorsal member 25 that mainly configures the dorsal side. The abdominal member 24 and the dorsal member 25 are made by bending metal plate-like members in different warping directions, respectively, and bending the metal plate-like members in different warping directions. By joining the vicinity of the edge along the edge by welding, an exterior shape as the stationary blade body is formed. In the present embodiment, the leading edge portion (indicated by arrow Q indicates the inflow direction of steam) located on the steam inlet side is TIG welding (reference numeral 26), and the trailing edge portion located on the steam outlet side is a laser. They are joined by welding (reference numeral 27). The abdomen side member 24 is warped so that the surface side becomes the abdomen surface 28 of the stationary blade 18. Further, the back member 25 is warped so that the surface side is the back surface 29 of the stationary blade 18. Furthermore, the abdominal member 24 and the dorsal member 25 form a hollow portion 30 with a hollow structure inside by making the curvature of the warpage different. That is, a cavity 30 extending along the blade height direction (the radial direction of the rotor shaft 16) is formed between the back surface 24c of the abdominal member 24 and the back surface 25a of the back member 25. In addition, inside the stationary blade 18, the inner surface of the blade is formed by the back surface 24 c of the abdominal member 24 and the back surface 25 a of the back member 25. The steam inlet side is the upstream side of the stationary blade 18 in the rectifying direction, and the steam outlet side is the downstream side of the stationary blade 18 in the rectifying direction.

腹側部材２４と背側部材２５とは、略同一の長さにわたって翼高さ方向に沿って延びている。また、腹側部材２４には、前縁側のスリット２４ａと後縁側のスリット２４ｂとが径方向Ｒに沿って複数形成されている。
なお、「翼高さ方向」とは、図４（Ａ）に示す翼形断面（ロータ軸１６の軸線と平行な横断面）に垂直な方向であり、静翼１８の翼型中心線Ｃに直交する方向である。また、スリット２４ａ，２４ｂと略同様のスリットを背側部材２５にも形成することができる。さらに、スリット２４ａ，２４ｂの形状や長さ等は任意である。 The ventral member 24 and the back member 25 extend along the blade height direction over substantially the same length. The ventral member 24 includes a plurality of slits 24 a on the front edge side and slits 24 b on the rear edge side along the radial direction R.
The “blade height direction” is a direction perpendicular to the airfoil cross section (a cross section parallel to the axis of the rotor shaft 16) shown in FIG. The directions are orthogonal. In addition, slits substantially the same as the slits 24 a and 24 b can be formed in the back member 25. Furthermore, the shapes and lengths of the slits 24a and 24b are arbitrary.

このように、本実施例の静翼１８においては、腹側部材２４が静翼１８の空洞部３０よりも腹側を構成し、背側部材２５が静翼１８の空洞部３０よりも背側を構成している。   Thus, in the stationary blade 18 of the present embodiment, the ventral member 24 constitutes the ventral side of the cavity portion 30 of the stationary blade 18, and the back member 25 is on the back side of the cavity portion 30 of the stationary blade 18. Is configured.

静翼１８の内部に形成された空洞部３０は、腹側部材２４に形成されているスリット２４ａ，２４ｂを介して、静翼１８の外部と連通している。空洞部３０とスリット２４ａ，２４ｂが形成された静翼１８において、腹面２８に付着している水は、例えば、蒸気圧力を受けて腹面２８を移動し、図４（Ａ）に矢印Ｗで示すように、スリット２４ａ，２４ｂから空洞部３０に流入可能となっている。   The cavity 30 formed inside the stationary blade 18 communicates with the outside of the stationary blade 18 through slits 24 a and 24 b formed in the ventral member 24. In the stationary blade 18 in which the cavity 30 and the slits 24a and 24b are formed, the water adhering to the abdominal surface 28 moves, for example, on the abdominal surface 28 under the vapor pressure, and is indicated by an arrow W in FIG. Thus, it can flow into the cavity 30 from the slits 24a and 24b.

空洞部３０に取り込まれた水は、シュラウド１９に向けて流れる。このシュラウド１９には、図３に示すように、静翼１８の空洞部３０と連通する開口３１が形成されており、空洞部３０の水は、矢印Ｅで示すように、この開口３１から排出可能となっている。   The water taken into the cavity 30 flows toward the shroud 19. As shown in FIG. 3, the shroud 19 is formed with an opening 31 communicating with the cavity 30 of the stationary blade 18. Water in the cavity 30 is discharged from the opening 31 as indicated by an arrow E. It is possible.

このように内部に空洞部３０を有する中空の静翼１８は、内部に空洞部３０を有しない中実静翼に比べて固有振動数が比較的小さなものとなっており、蒸気タービン１０の作動時において、自励振動（フラッタ）が生じ易くなっている。自励振動が生じると、静翼１８には弾性変形による撓みや捩れが生じ、静翼１８の腹側部材２４と背側部材２５との間には、相対的な位置変動が生じる。   As described above, the hollow stationary blade 18 having the hollow portion 30 inside has a relatively small natural frequency as compared with the solid stationary blade having no hollow portion 30 therein, and the operation of the steam turbine 10 At times, self-excited vibration (flutter) is likely to occur. When the self-excited vibration occurs, the stationary blade 18 is bent or twisted due to elastic deformation, and a relative position variation occurs between the abdominal member 24 and the back member 25 of the stationary blade 18.

この相対的な位置変動を減衰するため、本実施の形態に係る静翼１８においては、空洞部３０から、翼内面（裏面２４ｃ，裏面２５ａ）の一方に摺接可能な板状バネ部材３２が設けられており、静翼１８が弾性変形すると、この板状バネ部材３２は、翼内面（裏面２４ｃ，裏面２５ａ）の一方との間に摩擦が生じるようにしている。   In order to attenuate this relative positional fluctuation, in the stationary blade 18 according to the present embodiment, a plate-like spring member 32 that can be slidably contacted from the cavity 30 to one of the blade inner surfaces (back surface 24c, back surface 25a). When the stationary blade 18 is elastically deformed, the plate-like spring member 32 is configured to generate friction with one of the blade inner surfaces (the back surface 24c and the back surface 25a).

具体的には、板状バネ部材３２は、翼高さ方向に沿って長さ（以下、板状バネ部材３２に関して「長さ方向」と称する）を有し、翼形中心線Ｃに沿って幅（以下、板状バネ部材３２に関して「幅方向」と称する）を有する板金部材のプレス成形品から形成されている。また、板状バネ部材３２は、長さ方向に沿う縁部のうち、前縁（蒸気の入口側）側を固定部３２ａとして害長さ方向に沿って溶接することによって腹側部材２４の裏面２４ｃに固定されている。さらに、板状バネ部材３２は、幅方向の中央付近から後縁（蒸気の出口側）にわたる範囲を押圧部３２ｂとして背側部材２５の裏面２５ａを摺接可能に押圧している。また、板状バネ部材３２の固定部３２ａと押圧部３２ｂとの間の部分は、裏面２４ｃと裏面２５ａとにわたるように傾斜して固定部３２ａと押圧部３２ｂとを接続する接続部３２ｃを構成しており、この接続部３２ｃの傾斜角度（接続部３２ｃと押圧部３２ｂとの境界部分の角部分の角度を含む）によって、図４（Ｂ）に示すように、押圧部３２ｂにバネ性を付与している。したがって、所定の長さ方向及び幅方向において裏面２４ｃに固定部３２ａを密着させると共に、所定の長さ方向及び幅方向において裏面２５ａに押圧部３２ｂを摺接可能な密着状態で押圧している。また、押圧部３２ｂは裏面２５ａに対して摺接可能となっている。しかも、本実施の形態においては、押圧部３２ｂは、翼型中心線Ｃの中央よりも前縁側から後縁付近にわたる範囲で裏面２５ａを押圧している。これにより、静翼１８の蒸気の出口側において広範囲の面積で静翼１８の自励振動を抑制する減衰作用を及ぼすことが可能となっている。   Specifically, the plate spring member 32 has a length along the blade height direction (hereinafter referred to as “length direction” with respect to the plate spring member 32), and extends along the airfoil center line C. It is formed from a press-formed product of a sheet metal member having a width (hereinafter referred to as “width direction” with respect to the plate spring member 32). Further, the plate-like spring member 32 is welded along the harmful length direction by using the front edge (steam inlet side) side of the edge portion along the length direction as a fixed portion 32a, thereby backside the abdominal side member 24. 24c is fixed. Further, the plate-like spring member 32 presses the back surface 25a of the back side member 25 so as to be slidable with a range extending from the vicinity of the center in the width direction to the rear edge (steam outlet side) as a pressing portion 32b. Further, the portion between the fixed portion 32a and the pressing portion 32b of the plate spring member 32 is inclined so as to extend over the back surface 24c and the back surface 25a, and constitutes a connecting portion 32c that connects the fixing portion 32a and the pressing portion 32b. As shown in FIG. 4 (B), the connecting portion 32c has an inclination angle (including the angle of the corner portion at the boundary between the connecting portion 32c and the pressing portion 32b). Has been granted. Therefore, the fixing portion 32a is brought into close contact with the back surface 24c in a predetermined length direction and width direction, and the pressing portion 32b is pressed in a close contact state with the back surface 25a in a predetermined length direction and width direction. Moreover, the pressing part 32b can be slidably contacted with the back surface 25a. Moreover, in the present embodiment, the pressing part 32b presses the back surface 25a in a range extending from the front edge side to the vicinity of the rear edge rather than the center of the airfoil center line C. Thereby, it is possible to exert a damping action for suppressing the self-excited vibration of the stationary blade 18 in a wide area on the steam outlet side of the stationary blade 18.

このような構成において、空洞部３０に配設された状態（初期状態）においては、板状バネ部材３２は、撓み（接続部３２ｃの傾斜角度）により、図４（Ｂ）に示すように、僅かに弾性変形するように形成されている。この弾性力により、板状バネ部材３２は、図４（Ａ）に示すように、押圧部３２ｂが背側部材２５を裏面２５ａから押圧するようになっている。つまり、板状バネ部材３２は、空洞部３０に配設すると、主として背側部材２５の裏面２５ａを、静翼１８の翼厚方向外向きに付勢するように構成されている。   In such a configuration, in a state (initial state) disposed in the cavity 30, the plate spring member 32 is bent (inclination angle of the connection portion 32 c), as shown in FIG. It is formed to be slightly elastically deformed. With this elastic force, the plate-like spring member 32 is configured such that the pressing portion 32b presses the back member 25 from the back surface 25a as shown in FIG. That is, when the plate-like spring member 32 is disposed in the hollow portion 30, the plate-like spring member 32 is configured to mainly bias the back surface 25 a of the back side member 25 outward in the blade thickness direction of the stationary blade 18.

なお、「翼厚方向」とは、図４（Ａ）に示す翼形断面において、翼型中心線Ｃと直交する静翼１８の厚さ方向を意味している。   The “blade thickness direction” means the thickness direction of the stationary blade 18 perpendicular to the airfoil center line C in the airfoil cross section shown in FIG.

板状バネ部材３２の弾性力により、主として静翼１８の蒸気の出口側が弾性変形して腹側部材２４の裏面２４ｃと背側部材２５の裏面２５ａとの間に相対的な位置変動が生じると、この付勢力に応じた大きさの動摩擦力が作用可能となっている。   When the steam outlet of the stationary blade 18 is mainly elastically deformed by the elastic force of the plate spring member 32, a relative position variation occurs between the back surface 24c of the ventral member 24 and the back surface 25a of the back member 25. A dynamic friction force having a magnitude corresponding to the urging force can be applied.

蒸気タービン１０の作動時において、その運転条件によっては、静翼１８に自励振動が生じ、静翼１８が弾性変形しようとすることがある。   During operation of the steam turbine 10, depending on the operating conditions, self-excited vibration may occur in the stationary blade 18, and the stationary blade 18 may try to elastically deform.

このとき、板状バネ部材３２は、主として背側部材２５の裏面２５ａと広い範囲で押圧することにより、腹側部材２４と背側部材２５との相対的な位置変動を抑制する方向に動摩擦力が生じる。この動摩擦力により、腹側部材２４と背側部材２５との間における相対的な位置変動が減衰される。この結果、静翼１８に生じる自励振動を抑制することができる。   At this time, the plate-like spring member 32 mainly presses in a wide range with the back surface 25a of the back side member 25, so that the dynamic frictional force is exerted in a direction that suppresses relative positional fluctuation between the abdominal side member 24 and the back side member 25. Occurs. This dynamic friction force attenuates the relative position fluctuation between the ventral member 24 and the dorsal member 25. As a result, the self-excited vibration generated in the stationary blade 18 can be suppressed.

ところで、上記実施の形態においては、板状バネ部材３２は、固定部３２ａを腹側部材２４の裏面２４ｃに片持ち状態で接合し、押圧部３２ｂをへ側部材２５の裏面２５ａに広い範囲で押圧させる構成を開示したが、例えば、図５に示すように、板状バネ部材４２の前縁側の固定部４２ａを背側部材２５の蒸気の入口側付近の裏面２５ａに片持ち状態で接合し、板状バネ部材４２の後縁側の摺接部４２ｂを腹側部材２４の裏面２４ｃの蒸気の入口側付近から出口側付近に跨って当接させ、接続部４２ｃの傾斜角度によってバネ性（撓み）を持たせる構成としても良い。また、図６に示すように、板状バネ部材３２と板状バネ部材４２とを径方向Ｒに沿って（紙面奥行き方向に沿って）交互に配置しても良い。この際、板状バネ部材３２と板状バネ部材４２とは、各々１つ以上を用いるが、同数（対）とする必要はない。   By the way, in the said embodiment, the plate-shaped spring member 32 joins the fixing | fixed part 32a to the back surface 24c of the abdominal side member 24 in a cantilever state, and the press part 32b is in the wide range to the back surface 25a of the side member 25. Although the structure to press is disclosed, for example, as shown in FIG. 5, the fixing portion 42 a on the front edge side of the plate spring member 42 is joined to the back surface 25 a near the steam inlet side of the back side member 25 in a cantilever state. The sliding contact portion 42b on the rear edge side of the plate-like spring member 42 is brought into contact from the vicinity of the vapor inlet side of the back surface 24c of the ventral member 24 to the vicinity of the outlet side, and the spring property (deflection) is determined by the inclination angle of the connection portion 42c. ). In addition, as shown in FIG. 6, the plate spring members 32 and the plate spring members 42 may be alternately arranged along the radial direction R (along the depth direction on the paper surface). At this time, at least one plate spring member 32 and one plate spring member 42 are used, but it is not necessary to use the same number (pair).

このように、本発明の静翼及び蒸気タービンにあっては、片持ちの板状バネ部材３２，４２として蒸気の出口側を主として押圧するように構成し、そのバネ圧を一つの接続部３２ｃ，４２ｃで設定可能とすることができ、しかも、押圧部３２ｂ，４２ｂのみを裏面２５ａ（又は裏面２４ｃ）に沿うように形成することにより、簡素な構成で自励振動抑制すると共に、その減衰機能を容易に確保することができ、しかも、汎用性を向上することができる。   Thus, in the stationary blade and the steam turbine of the present invention, the cantilevered plate-like spring members 32 and 42 are configured to mainly press the steam outlet side, and the spring pressure is set to one connecting portion 32c. , 42c can be set, and only the pressing portions 32b, 42b are formed along the back surface 25a (or the back surface 24c), thereby suppressing self-excited vibration with a simple configuration and a damping function thereof. Can be easily secured, and versatility can be improved.

１０…蒸気タービン
１８…静翼
２４…腹側部材（腹側部）
２４ａ…スリット
２４ｂ…スリット
２４ｃ…裏面
２５…背側部材（背側部）
２５ａ…裏面
３０…空洞部
３２…板状バネ部材
３２ａ…固定部
３２ｂ…押圧部
３２ｃ…接続部 DESCRIPTION OF SYMBOLS 10 ... Steam turbine 18 ... Stator blade 24 ... Ventral side member (abdominal side)
24a ... Slit 24b ... Slit 24c ... Back side 25 ... Back side member (back side part)
25a ... Back 30 ... Cavity 32 ... Plate spring member 32a ... Fixed part 32b ... Pressing part 32c ... Connecting part

Claims (10)

前縁部分と後縁部分において接合される腹側部材と背側部材の各裏面によって空洞部が画成された静翼本体と、
前記空洞部に配置される背側板状バネ部材と、
を有する静翼において、
前記腹側部材の翼高さ方向断面は、前記前縁部分から前記後縁部分にかけて小さい曲率の湾曲をなし、
前記背側部材の翼高さ方向断面は、前記前縁部分において大きい曲率で湾曲したあと前記後縁部分にかけて前記腹側部材よりも小さい曲率の湾曲をなし、
前記背側板状バネ部材の一端側の縁部は、前記前縁部分において、前記腹側部材の前記裏面に固定され、
前記背側板状バネ部材の他端側は、翼形中心線の中央よりも前記前縁部分側から前記後縁部分にかけて、前記背側部材の前記裏面との摺接面を有し、
前記背側板状バネ部材の一端側と他端側とは、前記摺接面に押圧力を付与する接続部で接続されている、
ことを特徴とする静翼。 A stationary blade body cavity is defined by the rear surface of the flank member and dorsal material to be joined at a leading edge portion and trailing edge portion,
A dorsal plate spring member that will be disposed in the cavity,
In a stationary blade having
The blade height direction cross section of the ventral member has a small curvature curve from the leading edge portion to the trailing edge portion,
The wing height direction cross section of the dorsal member is curved with a large curvature at the front edge portion and then curved with a smaller curvature than the ventral member over the trailing edge portion,
An edge portion on one end side of the back plate-like spring member is fixed to the back surface of the ventral member at the front edge portion,
The other end side of the back plate spring member has a sliding surface with the back surface of the back member from the front edge portion side to the rear edge portion rather than the center of the airfoil center line,
The one end side and the other end side of the dorsal plate spring member are connected by a connecting portion that applies a pressing force to the sliding contact surface.
A stationary blade characterized by that. 前縁部分と後縁部分において接合される腹側部材と背側部材の各裏面によって空洞部が画成された静翼本体と、
前記空洞部に配置される腹側板状バネ部材と、
を有する静翼において、
前記腹側部材の翼高さ方向断面は、前記前縁部分から前記後縁部分にかけて小さい曲率の湾曲をなし、
前記背側部材の翼高さ方向断面は、前記前縁部分において大きい曲率で湾曲したあと前記後縁部分にかけて前記腹側部材よりも小さい曲率の湾曲をなし、
前記腹側板状バネ部材の一端側の縁部は、前記前縁部分において、前記背側部材の前記裏面に固定され、
前記腹側板状バネ部材の他端側は、翼形中心線の中央よりも前記前縁部分側から前記後縁部分にかけて、前記腹側部材の前記裏面との摺接面を有し、
前記腹側板状バネ部材の一端側と他端側とは、前記摺接面に押圧力を付与する接続部で接続されている、
ことを特徴とする静翼。 A stationary blade body cavity is defined by the rear surface of the flank member and dorsal material to be joined at a leading edge portion and trailing edge portion,
A ventral plate spring member that will be disposed in the cavity,
In a stationary blade having
The blade height direction cross section of the ventral member has a small curvature curve from the leading edge portion to the trailing edge portion,
The wing height direction cross section of the dorsal member is curved with a large curvature at the front edge portion and then curved with a smaller curvature than the ventral member over the trailing edge portion,
An edge portion on one end side of the abdominal plate spring member is fixed to the back surface of the back member at the front edge portion,
The other end side of the ventral plate spring member has a sliding surface with the back surface of the ventral member from the front edge part side to the rear edge part rather than the center of the airfoil center line,
The one end side and the other end side of the abdominal plate spring member are connected by a connecting portion that applies a pressing force to the sliding contact surface.
A stationary blade characterized by that. 前縁部分と後縁部分において接合される腹側部材と背側部材の各裏面によって空洞部が画成された静翼本体と、
前記空洞部に配置される背側板状バネ部材及び腹側板状バネ部材と、
を有する静翼において、
前記腹側部材の翼高さ方向断面は、前記前縁部分から前記後縁部分にかけて小さい曲率の湾曲をなし、
前記背側部材の翼高さ方向断面は、前記前縁部分において大きい曲率で湾曲したあと前記後縁部分にかけて前記腹側部材よりも小さい曲率の湾曲をなし、
前記背側板状バネ部材の一端側の縁部は、前記前縁部分において、前記腹側部材の前記裏面に固定され、
前記背側板状バネ部材の他端側は、翼形中心線の中央よりも前記前縁部分側から前記後縁部分にかけて、前記背側部材の前記裏面との摺接面を有し、
前記背側板状バネ部材の一端側と他端側とは、前記摺接面に押圧力を付与する接続部で接続されており、
前記腹側板状バネ部材の一端側の縁部は、前記前縁部分において、前記背側部材の前記裏面に固定され、
前記腹側板状バネ部材の他端側は、翼形中心線の中央よりも前記前縁部分側から前記後縁部分にかけて、前記腹側部材の前記裏面との摺接面を有し、
前記腹側板状バネ部材の一端側と他端側とは、前記摺接面に押圧力を付与する接続部で接続されている、
ことを特徴とする静翼。 A stationary blade body cavity is defined by the rear surface of the flank member and dorsal material to be joined at a leading edge portion and trailing edge portion,
And the back-side plate spring member and the ventral plate spring member that will be disposed in the cavity,
In a stationary blade having
The blade height direction cross section of the ventral member has a small curvature curve from the leading edge portion to the trailing edge portion,
The wing height direction cross section of the dorsal member is curved with a large curvature at the front edge portion and then curved with a smaller curvature than the ventral member over the trailing edge portion,
An edge portion on one end side of the back plate-like spring member is fixed to the back surface of the ventral member at the front edge portion,
The other end side of the back plate spring member has a sliding surface with the back surface of the back member from the front edge portion side to the rear edge portion rather than the center of the airfoil center line,
One end side and the other end side of the dorsal plate-like spring member are connected by a connecting portion that applies a pressing force to the sliding contact surface,
An edge portion on one end side of the abdominal plate spring member is fixed to the back surface of the back member at the front edge portion,
The other end side of the ventral plate spring member has a sliding surface with the back surface of the ventral member from the front edge part side to the rear edge part rather than the center of the airfoil center line,
The one end side and the other end side of the abdominal plate spring member are connected by a connecting portion that applies a pressing force to the sliding contact surface.
A stationary blade characterized by that. 前記背側板状バネ部材の前記接続部は、前記背側板状バネ部材の一端側と他端側を接続するように、前記腹側部材の前記裏面から前記背側部材の前記裏面に向かうに従って漸次前記後縁部分側に延在することを特徴とする請求項１又は３に記載の静翼。 The connecting portion of the back plate-like spring member gradually moves from the back surface of the ventral member toward the back surface of the back member so as to connect one end side and the other end side of the back plate spring member. vane according to claim 1 or 3, characterized in that extending the trailing edge portion side. 前記背側板状バネ部材の他端側は、前記背側部材の前記裏面の前記後縁部分側の端部付近に至るまで該裏面に添って延びていることを特徴とする請求項１、３、４のいずれか一項に記載の静翼。 The other end of the back-side plate spring member, according to claim 1, 3, characterized in that extending along the back surface up to the vicinity of an end portion of said trailing edge portion side of the back surface of the back-side member The stationary blade according to any one of 4 . 前記腹側板状バネ部材の前記接続部は、前記腹側板状バネ部材の一端側と他端側を接続するように、前記背側部材の前記裏面から前記腹側部材の前記裏面に向かうに従って漸次前記後縁部分側に延在することを特徴とする請求項２又は３に記載の静翼。 The connecting portion of the abdominal plate spring member gradually moves from the back surface of the back member toward the back surface of the abdominal member so as to connect one end side and the other end side of the abdominal plate spring member. The stationary blade according to claim 2 , wherein the stationary blade extends toward the trailing edge portion . 前記腹側板状バネ部材の他端側は、前記腹側部材の前記裏面の前記後縁部分側の端部付近に至るまで該裏面に添って延びていることを特徴とする請求項２、３、６のいずれか一項に記載の静翼。 The other end of the belly-side plate spring member, according to claim 2, characterized in that extending along the back surface up to the vicinity of the end portion of the rear edge portion side of the back surface of the ventral side member The stationary blade according to any one of 6 and 6 . 前記前縁部分の前記腹側部材と前記背側部材が接合される部分の翼高さ方向断面が、曲線で構成されているThe blade height direction cross section of the portion where the ventral member and the dorsal member of the front edge portion are joined is configured with a curve.
ことを特徴とする請求項１から７のいずれか一項に記載の静翼。The stationary blade according to any one of claims 1 to 7, wherein 請求項１から８のいずれか一項に記載の静翼が、ロータ軸の周方向に所定の間隔をあけて配列されていることを特徴とする蒸気タービン。 A steam turbine, wherein the stator blades according to any one of claims 1 to 8 are arranged at a predetermined interval in a circumferential direction of the rotor shaft. 前記静翼本体に、表面側から前記空洞部の内部へと水滴を案内するスリットが形成されていることを特徴とする請求項９に記載の蒸気タービン。 The steam turbine according to claim 9 , wherein a slit for guiding water droplets from the surface side to the inside of the cavity is formed in the stationary blade body.
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