JP2005307970A - Turbine partition plate and turbine provided with it - Google Patents

Turbine partition plate and turbine provided with it Download PDF

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JP2005307970A
JP2005307970A JP2005076711A JP2005076711A JP2005307970A JP 2005307970 A JP2005307970 A JP 2005307970A JP 2005076711 A JP2005076711 A JP 2005076711A JP 2005076711 A JP2005076711 A JP 2005076711A JP 2005307970 A JP2005307970 A JP 2005307970A
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fitting portion
inner ring
turbine
partition plate
stationary blade
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JP4436273B2 (en
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Yukihiro Otani
幸広 大谷
Yuuichiro Waki
勇一朗 脇
Keizo Tanaka
恵三 田中
Toshio Asada
俊夫 浅田
Takashi Nakano
隆 中野
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a turbine partition plate capable of securely fixing a stationary blade and an inner ring by a simple configuration. <P>SOLUTION: A pressure supply channel a is formed of the outer peripheral face of the inner ring 14 on the upstream side in the direction of the flow of steam indicated by an arrow mark to a rising face 14ab. Consequently, steam pressure on the upstream side is transmitted along the pressure supply channel a and led between the outer peripheral face 14ac of a fitting part 14a and the bottom face 3bc of a fitting part 3b when operating a turbine to press the inner ring 14 in the direction of an inner periphery by this pressure. At this time, a rising face 14aa in the fitting part 14a slides while it is abutted on a rising face 3ba in the fitting part 3b, and the inner ring 14 moves to the upstream side in the direction of the flow of steam. As a result, a clearance between the rising faces 3ba and 14aa becomes zero, and a clearance between the rising faces 3bb and 14ab becomes zero. The fitting parts 3b and 14a are securely fitted, and the inner ring 14 is fixed to the stationary blade 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、蒸気タービンやガスタービン等のタービンに関するものであり、特にそのタービン仕切板に関するものである。   The present invention relates to a turbine such as a steam turbine or a gas turbine, and more particularly to the turbine partition plate.

従来より、例えば蒸気タービンにおいては、蒸気の通路に静翼と動翼を交互に複数段設けて構成される。動翼はロータ軸と一体となっており、この動翼が蒸気圧力を受けてロータ軸を回転させる。静翼のタービン外周側には、車室に対して静翼を固定させる外輪が設けられており、静翼のタービン内周側には、静翼と動翼との気密性を保持するためのシールが付設される内輪が設けられている。これら内輪,静翼,及び外輪は溶接にて接合され、仕切板を形成する。また、溶接後には歪み除去のために焼鈍が行われる。なお、仕切板はロータ軸を取り囲むように略ドーナツ状に形成されるので、組立時を考慮し、180度ずつ2分割して製作される。   Conventionally, for example, a steam turbine is configured by alternately providing a plurality of stages of stationary blades and moving blades in a steam passage. The rotor blade is integrated with the rotor shaft, and the rotor blade receives the steam pressure and rotates the rotor shaft. An outer ring for fixing the stationary blade to the passenger compartment is provided on the outer peripheral side of the turbine of the stationary blade, and the inner peripheral side of the stationary blade for maintaining the airtightness between the stationary blade and the moving blade. An inner ring to which a seal is attached is provided. These inner ring, stationary blade, and outer ring are joined by welding to form a partition plate. Further, after welding, annealing is performed to remove distortion. Since the partition plate is formed in a substantially donut shape so as to surround the rotor shaft, the partition plate is manufactured by being divided into two parts by 180 degrees in consideration of assembly.

ところが、このような仕切板においては、静翼を何十枚も溶接して組み立てる必要があり、またメンテナンス時には仕切板を一体として取り扱わなくてはならないので、製作効率及び補修作業効率が悪く、コスト高となる。また、溶接後には歪み除去のための焼鈍工程が不可欠であり、この焼鈍工程により、研磨した静翼表面の面粗度が悪化し、翼付近の蒸気流れが乱れ、ひいてはタービンの性能が悪化するという問題点があった。   However, in such a partition plate, it is necessary to weld and assemble dozens of stationary blades, and since the partition plate must be handled as a unit during maintenance, production efficiency and repair work efficiency are poor, and cost is low. Become high. In addition, after welding, an annealing process for strain removal is indispensable, and this annealing process deteriorates the surface roughness of the polished stationary blade surface, disturbs the steam flow near the blade, and thus deteriorates the performance of the turbine. There was a problem.

そこで、静翼と内外輪との結合手段を工夫することにより、タービン効率を損なうことなく組立効率に優れる構成とした蒸気タービン仕切板が特許文献1に開示されている。これは、内周側にロータ軸との隙間を塞ぐシールが付設され、外周側に嵌合部Aを有する略ドーナツ状の内輪と、前記内輪の前記嵌合部Aに嵌合する嵌合部Bを、タービンに付設された状態の径方向内側に有する静翼と、を備えた構成としている。   In view of this, Patent Document 1 discloses a steam turbine partition plate that has a structure excellent in assembly efficiency without degrading turbine efficiency by devising a coupling means between a stationary blade and inner and outer rings. This is provided with a seal that closes the gap with the rotor shaft on the inner peripheral side, a substantially donut-shaped inner ring having a fitting part A on the outer peripheral side, and a fitting part that fits into the fitting part A of the inner ring And a stationary blade having B on the radially inner side attached to the turbine.

ここでは内輪がその外周側に凹形状,凸形状,T字溝形状等の嵌合部Aを有し、一方、静翼がその径方向内側に凸形状,凹形状,T字突起形状等の嵌合部Bを有する。蒸気タービン仕切板は、これら静翼と内輪との嵌合によって構成される。これにより、蒸気タービン仕切板は、その剛性が十分に確保されるとともに、組立,分解の効率を著しく向上させるとしている。   Here, the inner ring has a fitting portion A having a concave shape, a convex shape, a T-shaped groove shape or the like on its outer peripheral side, while the stationary blade has a convex shape, a concave shape, a T-shaped projection shape, or the like on its radial inner side. It has a fitting part B. The steam turbine partition plate is configured by fitting these stationary blades and inner rings. As a result, the steam turbine partition plate sufficiently secures its rigidity and remarkably improves the efficiency of assembly and disassembly.

その他、アリ溝構造により静翼と内輪とを固定する構成のものが、特許文献2に開示されている。
特開2004−36546号公報 特開2002−180802号公報
In addition, Patent Document 2 discloses a configuration in which a stationary blade and an inner ring are fixed by a dovetail structure.
JP 2004-36546 A JP 2002-180802 A

しかしながら、上記特許文献1或いは特許文献2に記載の構成においては、静翼の剛性が低い場合、つまり比較的細長い形状の場合には、静翼と内輪との嵌合部の隙間による倒れ量が大きくなり、また蒸気の圧力を受けて発生する応力が大きくなる。   However, in the configuration described in Patent Document 1 or Patent Document 2, if the rigidity of the stationary blade is low, that is, in the case of a relatively elongated shape, the amount of collapse due to the gap between the fitting portions of the stationary blade and the inner ring is small. In addition, the stress generated due to steam pressure increases.

本発明は、このような問題点に鑑み、簡単な構成で、静翼と内輪とを確実に固定することができるようにしたタービン仕切板を提供することを目的とする。   In view of such problems, an object of the present invention is to provide a turbine partition plate that can reliably fix a stationary blade and an inner ring with a simple configuration.

上記目的を達成するために、請求項1記載の発明に係るタービン仕切板は、先端にアリ溝の第1嵌合部を有する静翼と、前記アリ溝に嵌合する第2嵌合部を有する内輪とを備え、少なくとも前記アリ溝の駆動ガス流れ方向下流側の面を、テーパーを設けたアンダーカット形状とし、前記第1嵌合部の面に前記第2嵌合部の面を当接するようにしたことを特徴とする。   In order to achieve the above object, a turbine partition plate according to the first aspect of the present invention includes a stationary blade having a first fitting portion of a dovetail groove at a tip, and a second fitting portion fitted into the dovetail groove. And at least the surface on the downstream side in the driving gas flow direction of the dovetail groove has a tapered undercut shape, and the surface of the second fitting portion is in contact with the surface of the first fitting portion. It is characterized by doing so.

請求項2記載の発明に係るタービン仕切板は、前記第1嵌合部と前記第2嵌合部との間に前記駆動ガスの圧力を導入し、その圧力により前記内輪をその内周方向に押し付ける圧力供給溝を設けたことを特徴とする。   A turbine partition plate according to a second aspect of the present invention introduces a pressure of the driving gas between the first fitting portion and the second fitting portion, and the pressure causes the inner ring to move in the inner circumferential direction. A pressure supply groove for pressing is provided.

請求項3記載の発明に係るタービン仕切板は、前記第1嵌合部と前記第2嵌合部との間に、前記内輪をその内周方向に押し付ける板バネを設けたことを特徴とする。   A turbine partition plate according to a third aspect of the present invention is characterized in that a leaf spring that presses the inner ring in the inner circumferential direction is provided between the first fitting portion and the second fitting portion. .

請求項4記載の発明に係るタービン仕切板は、前記第1嵌合部と前記第2嵌合部との間に、前記内輪をその内周方向に押し付けるバネシールを設けたことを特徴とする。   A turbine partition plate according to a fourth aspect of the present invention is characterized in that a spring seal is provided between the first fitting portion and the second fitting portion to press the inner ring in the inner circumferential direction.

請求項5記載の発明に係るタービン仕切板は、前記第1嵌合部と前記第2嵌合部との間に、熱膨張により前記内輪をその内周方向に押し付ける膨張材料を設けたことを特徴とする。   The turbine partition plate according to the invention of claim 5 is provided with an expansion material between the first fitting portion and the second fitting portion to press the inner ring in the inner circumferential direction by thermal expansion. Features.

請求項6記載の発明に係るタービン仕切板は、前記第1嵌合部と前記第2嵌合部との間に、前記内輪をその内周方向に押し付ける硬化型充填材を設けたことを特徴とする。   The turbine partition plate according to the invention of claim 6 is characterized in that a curable filler for pressing the inner ring in the inner circumferential direction is provided between the first fitting portion and the second fitting portion. And

請求項7記載の発明に係るタービン仕切板は、前記内輪の内周側より前記第1嵌合部側へとボルトを螺合挿入し、該ボルトの先端を前記第1嵌合部に押し当てることにより、前記内輪をその内周方向に押し付けるようにしたことを特徴とする。   In the turbine partition plate according to the seventh aspect of the present invention, a bolt is screwed and inserted from the inner peripheral side of the inner ring to the first fitting portion side, and the tip of the bolt is pressed against the first fitting portion. Thus, the inner ring is pressed in the inner circumferential direction.

請求項8記載の発明に係るタービン仕切板は、前記第1嵌合部と前記第2嵌合部との間にコーキングピースを挿入することにより、前記内輪をその内周方向に押し付けるようにしたことを特徴とする。   The turbine partition plate according to an eighth aspect of the invention is configured such that a caulking piece is inserted between the first fitting portion and the second fitting portion, thereby pressing the inner ring in the inner circumferential direction. It is characterized by that.

請求項9記載の発明に係るタービン仕切板は、前記内輪の外周面と前記静翼のタービン径方向内側端面との間にコーキングピースを挿入することにより、前記内輪をその内周方向に押し付けるようにしたことを特徴とする。   The turbine partition plate according to the invention of claim 9 is configured to press the inner ring in the inner circumferential direction by inserting a caulking piece between the outer circumferential surface of the inner ring and the turbine radial inner end surface of the stationary blade. It is characterized by that.

請求項10記載の発明に係るタービン仕切板は、前記アリ溝の駆動ガス流れ方向上流側及び下流側の両方の面を、テーパーを設けたアンダーカット形状としたことを特徴とする。   The turbine partition plate according to the invention described in claim 10 is characterized in that both the upstream and downstream surfaces of the dovetail groove in the driving gas flow direction have an undercut shape provided with a taper.

本発明によれば、アリ溝の駆動ガス流れ方向下流側の面がアンダーカットを成し、前記下流側の面に当接する前記第2嵌合部の面も、アンダーカットとなっているという簡単な構成で、静翼と内輪とを確実に固定することができるようにしたタービン仕切板を提供することができる。   According to the present invention, the downstream surface of the dovetail groove in the driving gas flow direction is undercut, and the surface of the second fitting portion that is in contact with the downstream surface is also undercut. With this configuration, it is possible to provide a turbine partition plate that can reliably fix the stationary blade and the inner ring.

また、アリ溝嵌合部に圧力供給溝を設けて、蒸気圧力により内輪を内周方向に押し付ける構成とすることにより、溶接構造を用いることなく、タービン運転時には嵌合部の隙間を0とすることができる。これにより、内輪にて静翼を拘束することができ、タービン仕切板ひいてはタービンの信頼性が向上し、またタービン効率がアップする。   Further, by providing a pressure supply groove in the dovetail fitting part and pressing the inner ring in the inner circumferential direction by steam pressure, the gap of the fitting part is set to 0 during turbine operation without using a welding structure. be able to. Thereby, a stationary blade can be restrained with an inner ring, the reliability of a turbine partition plate and by extension, a turbine improves, and turbine efficiency improves.

その他、蒸気圧力の代わりに、バネや膨張・充填材料、或いはボルトやコーキングピース等を用いることにより、内輪を内周方向に押し付ける構成として、嵌合部の隙間を0とすることが可能である。   In addition, by using a spring, an expansion / filling material, a bolt, a caulking piece, or the like instead of the steam pressure, the gap of the fitting portion can be set to 0 as a configuration for pressing the inner ring in the inner circumferential direction. .

以下、本発明の実施の形態について、図面を参照しながら説明する。図1は、本発明が適用される蒸気タービンの内部構造の一例を示す断面図である。同図に示すように、蒸気タービンは、矢印で示すように供給される蒸気の通路に、静翼1,2,3と動翼4,5,6を交互に設けて複数段(ここでは3段)で構成されている。但し、翼の段数は同図のものに限定されるわけでは勿論なく、他の段数としても良い。動翼4,5,6はロータ軸7と一体となっており、蒸気圧力を受けてロータ軸7を回転させる。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of the internal structure of a steam turbine to which the present invention is applied. As shown in the figure, the steam turbine is provided with a plurality of stages (here, 3) by alternately providing the stationary blades 1, 2, 3 and the moving blades 4, 5, 6 in the steam passage supplied as indicated by arrows. Stage). However, the number of blade stages is not limited to that shown in the figure, and other stages may be used. The rotor blades 4, 5, 6 are integrated with the rotor shaft 7 and rotate the rotor shaft 7 in response to the steam pressure.

静翼1,2,3のタービン径方向外周側には、図示しない車室に対して各静翼を固定させる外輪8が設けられている。また静翼1,2,3各々のタービン径方向内周側には、内輪12,13,14がそれぞれ設けられており、更にその内周側には静翼と動翼との気密性を保持するためのシール9,10,11がそれぞれ付設されている。外輪8と静翼1,2,3、及び内輪12,13,14とで仕切板15が構成される。仕切板15は供給される蒸気を整流するとともに、動翼4,5,6間の気密性を保つ働きをしている。なお、動翼4,5,6各々のタービン径方向外周側には、静翼と動翼との気密性を保持するためのシール4a,5a,6aがそれぞれ付設されている。   On the outer peripheral side of the stationary blades 1, 2, and 3 in the radial direction of the turbine, an outer ring 8 is provided for fixing the stationary blades to a vehicle compartment (not shown). Inner rings 12, 13, and 14 are provided on the inner peripheral side of the turbine blades 1, 2, and 3 in the radial direction of the turbine, respectively. Seals 9, 10, and 11 are provided for the purpose. The outer ring 8, the stationary blades 1, 2, 3 and the inner rings 12, 13, 14 constitute a partition plate 15. The partition plate 15 functions to rectify the supplied steam and to maintain airtightness between the rotor blades 4, 5, and 6. In addition, seals 4a, 5a, and 6a for maintaining airtightness between the stationary blades and the moving blades are respectively attached to the outer peripheral sides of the moving blades 4, 5, and 6 in the turbine radial direction.

外輪8は、外周側が図示しない車室内壁に組み付けられ、内周側に静翼と嵌合する嵌合部8a,8b,8cを有する略ドーナツ状をしている。ここに示した外輪8は、複数段の静翼を連結する方式のものであるが、これに限らず各段の静翼に別々の外輪がそれぞれ嵌合する方式としても良い。内輪12,13,14は、内周側にロータ軸7との隙間を塞ぐ前記シール9,10,11がそれぞれ付設され、外周側に静翼と嵌合する嵌合部12a,13a,14aをそれぞれ有する略ドーナツ状をしている。   The outer ring 8 has a substantially donut shape in which the outer peripheral side is assembled to a vehicle interior wall (not shown) and the inner peripheral side has fitting portions 8a, 8b, and 8c for fitting with the stationary blades. The outer ring 8 shown here is of a system that connects a plurality of stages of stationary blades, but is not limited thereto, and may be a system in which separate outer rings are fitted to the stationary blades of each stage. The inner rings 12, 13, 14 are provided with the seals 9, 10, 11 that close the gap with the rotor shaft 7 on the inner peripheral side, respectively, and the fitting portions 12 a, 13 a, 14 a that fit the stationary blades are provided on the outer peripheral side. Each has a substantially donut shape.

静翼1,2,3は、外輪8の前記嵌合部8a,8b,8cそれぞれに嵌合する嵌合部1a,2a,3aをタービン径方向外側端にそれぞれ有しており、また内輪12,13,14の前記嵌合部12a,13a,14aそれぞれに嵌合する嵌合部1b,2b,3bをタービン径方向内側端にそれぞれ有している。静翼1,2,3は、仕切板15の組み立て時には、180度分ずつに2分割された外輪8及び、90度分ずつに4分割された内輪12,13,14それぞれの周方向から各嵌合部で嵌合させつつ挿入される。   The stationary blades 1, 2, and 3 have fitting portions 1 a, 2 a, and 3 a that fit into the fitting portions 8 a, 8 b, and 8 c of the outer ring 8, respectively, at the outer end in the turbine radial direction. , 13, and 14 have fitting portions 1b, 2b, and 3b that fit into the fitting portions 12a, 13a, and 14a, respectively, at the inner end in the turbine radial direction. When the partition plate 15 is assembled, the stationary vanes 1, 2, and 3 are respectively separated from the circumferential direction of the outer ring 8 that is divided into two parts by 180 degrees and the inner rings 12, 13, and 14 that are divided into four parts every 90 degrees. It is inserted while being fitted at the fitting portion.

そして、外輪8と静翼1,2,3は、コーキング16,17,18で周方向に対して固定される。また、内輪12,13,14と静翼1,2,3は、後述する止めネジにより周方向に対して固定される。また、二点鎖線で示した21は上下に分割された外輪8を締結するボルトであり、ここでは周方向から見た配置関係を示している。実際には外輪8のタービン水平面に設けられる。詳しくは後述する。   And the outer ring | wheel 8 and the stationary blades 1, 2, and 3 are fixed with respect to the circumferential direction by the caulks 16, 17, and 18. FIG. Further, the inner rings 12, 13, 14 and the stationary blades 1, 2, 3 are fixed in the circumferential direction by a set screw which will be described later. Moreover, 21 shown with the dashed-two dotted line is a volt | bolt which fastens the outer ring | wheel 8 divided | segmented up and down, and has shown the arrangement | positioning relationship seen from the circumferential direction here. Actually, it is provided on the turbine horizontal surface of the outer ring 8. Details will be described later.

図2は、本発明の実施例1に係るタービン仕切板の内輪及びその近辺の拡大断面図である。本実施例では同図に示すように、内輪14の外周側に設けた凸状の嵌合部14aと、静翼3のタービン径方向内側端に設けた凹状の嵌合部3bとが嵌合している。そして、嵌合部3bは開口部より底部の幅が広い、いわゆるアリ溝となっており、このアリ溝形状に沿って嵌合部14aが嵌合する構成である。なお、本実施例は静翼3及び内輪14で代表させて説明しているが、他の静翼及び内輪の関係についても同様である。   FIG. 2 is an enlarged cross-sectional view of the inner ring of the turbine partition plate and the vicinity thereof according to the first embodiment of the present invention. In this embodiment, as shown in the figure, a convex fitting portion 14a provided on the outer peripheral side of the inner ring 14 and a concave fitting portion 3b provided on the turbine radial direction inner end of the stationary blade 3 are fitted. doing. And the fitting part 3b becomes what is called a dovetail whose width | variety of a bottom part is wider than an opening part, and is a structure which the fitting part 14a fits along this dovetail groove shape. In this embodiment, the stationary blade 3 and the inner ring 14 are representatively described, but the same applies to the relationship between the other stationary blades and the inner ring.

具体的には、矢印で示した蒸気の流れ方向下流側の立ち上がり面(タービン略径方向に立ち上がる面)、即ち嵌合部3bの立ち上がり面3ba及び嵌合部14aの立ち上がり面14aaが、それぞれアンダーカットとなる方向に傾斜した(テーパーを設けた)構成となっている。一方、蒸気の流れ方向上流側の立ち上がり面、即ち嵌合部3bの立ち上がり面3bb及び嵌合部14aの立ち上がり面14abは、それぞれ略垂直に立ち上がっている。   Specifically, the rising surface downstream of the steam flow direction indicated by the arrow (the surface rising in the turbine radial direction), that is, the rising surface 3ba of the fitting portion 3b and the rising surface 14aa of the fitting portion 14a, respectively, are under. The structure is inclined (provided with a taper) in the direction of cutting. On the other hand, the rising surface on the upstream side in the steam flow direction, that is, the rising surface 3bb of the fitting portion 3b and the rising surface 14ab of the fitting portion 14a rise substantially vertically.

その他、内輪14の内周側に設けた嵌合凹部14bに、シール11の外周側に設けた嵌合凸部11aが嵌合しており、これにより内輪14の内周側にシール11が付設されている。但し、内輪とシールは一体化しても良い。また、二点鎖線で示した19は内輪14と静翼3を固定する上記止めネジであり、ここでは周方向から見た位置関係を示している。実際には内輪14のタービン水平面に設けられる。詳しくは後述する。   In addition, a fitting convex portion 11 a provided on the outer peripheral side of the seal 11 is fitted in a fitting concave portion 14 b provided on the inner peripheral side of the inner ring 14, whereby the seal 11 is provided on the inner peripheral side of the inner ring 14. Has been. However, the inner ring and the seal may be integrated. Reference numeral 19 shown by a two-dot chain line is the set screw for fixing the inner ring 14 and the stationary blade 3, and here shows the positional relationship as seen from the circumferential direction. Actually, it is provided on the turbine horizontal surface of the inner ring 14. Details will be described later.

上述したように、内輪の静翼に対する嵌合部を凸状とすることで、内輪の断面積を大きくとることができ、内輪のねじれ剛性を高く保つことができる。また、シールを付設するためのスペースも確保しやすくなる。但し、内輪の静翼に対する嵌合部を凹状とする構成も可能である。なお、図2で示した内輪及びその近辺の構造は、本実施例における他の内輪についても同様に適用される。   As described above, by making the fitting part of the inner ring with respect to the stationary blade convex, the cross-sectional area of the inner ring can be increased, and the torsional rigidity of the inner ring can be kept high. Moreover, it becomes easy to ensure the space for attaching a seal | sticker. However, a configuration in which the fitting portion of the inner ring with respect to the stationary blade is concave is also possible. The inner ring shown in FIG. 2 and the structure in the vicinity thereof are similarly applied to the other inner rings in this embodiment.

また、内輪14の外周側に設けた凸状の嵌合部14aと、静翼3のタービン径方向内側端に設けた凹状の嵌合部3bとを当接させる方法として、凸状の嵌合部14aと凹状の嵌合部3bとを略隙間無く接するようにしても良いし、しまり嵌めとしても良いし、凸状の嵌合部14aの部材を凹状の嵌合部3bの部材より熱膨張係数の大きいものとして構成しても良い。この場合は、凸状の嵌合部14aと凹状の嵌合部3bの形状は任意に選択できる。   Further, as a method of bringing the convex fitting portion 14a provided on the outer peripheral side of the inner ring 14 into contact with the concave fitting portion 3b provided at the turbine radial direction inner end of the stationary blade 3, a convex fitting is employed. The portion 14a and the concave fitting portion 3b may be in contact with each other with almost no gap, or may be a close fit, and the member of the convex fitting portion 14a is more thermally expanded than the member of the concave fitting portion 3b. You may comprise as a thing with a big coefficient. In this case, the shape of the convex fitting part 14a and the concave fitting part 3b can be selected arbitrarily.

さらに、蒸気の流れ方向下流側の立ち上がり面(タービン略径方向に立ち上がる面)、即ち嵌合部3bの立ち上がり面3ba及び嵌合部14aの立ち上がり面14aaが、それぞれアンダーカットとなる方向に傾斜した(テーパーを設けた)構成とし、一方、蒸気の流れ方向上流側の立ち上がり面、即ち嵌合部3bの立ち上がり面3bb及び嵌合部14aの立ち上がり面14abは、それぞれ略垂直に立ち上がるように構成したほうが、確実に内輪14と静翼3を固定することができる。   Further, the rising surface (the surface rising in the substantially radial direction of the turbine) on the downstream side in the steam flow direction, that is, the rising surface 3ba of the fitting portion 3b and the rising surface 14aa of the fitting portion 14a are inclined in the direction of undercut. On the other hand, the rising surface on the upstream side in the steam flow direction, that is, the rising surface 3bb of the fitting portion 3b and the rising surface 14ab of the fitting portion 14a are configured to rise substantially vertically. However, the inner ring 14 and the stationary blade 3 can be securely fixed.

図3は、本実施例に係るタービン仕切板の内輪及びその近辺の詳細断面図である。同図に示すように、矢印で示した蒸気の流れ方向上流側の内輪14外周面から立ち上がり面14abにかけて、圧力供給溝aを設けている。これはタービン全周に渡って配設されている静翼3各々に対応して設けられている。なお、このような圧力供給溝は、対向する静翼3側に設けても良い。或いは、圧力供給溝を設ける代わりに、嵌合部3bと静翼3の外側とを連通する圧力導入孔を設けても良い。図4は圧力供給溝を内輪外周側から見た一例を示す図である。これは、内輪14の外周面をエンドミル等により蒸気の流れ方向上流側から削り始めて、立ち上がり面14abまで切削加工してR面を有する圧力供給溝aを形成したものである。勿論このような加工法に限定されるものではない。   FIG. 3 is a detailed cross-sectional view of the inner ring of the turbine partition plate according to the present embodiment and the vicinity thereof. As shown in the figure, a pressure supply groove a is provided from the outer peripheral surface of the inner ring 14 on the upstream side in the steam flow direction indicated by the arrow to the rising surface 14ab. This is provided corresponding to each stationary blade 3 arranged over the entire circumference of the turbine. Such a pressure supply groove may be provided on the opposite stationary blade 3 side. Or you may provide the pressure introduction hole which connects the fitting part 3b and the outer side of the stationary blade 3 instead of providing a pressure supply groove | channel. FIG. 4 is a view showing an example of the pressure supply groove as viewed from the outer peripheral side of the inner ring. In this example, the outer peripheral surface of the inner ring 14 is started to be cut from the upstream side in the steam flow direction by an end mill or the like, and is cut to the rising surface 14ab to form a pressure supply groove a having an R surface. Of course, it is not limited to such a processing method.

このように、圧力供給溝を設けることにより、タービン運転時には上流側の蒸気圧力がこの圧力供給溝aを伝わって、嵌合部14aの外周面14acと嵌合部3bの底面3bcとの間に導入され、この圧力により内輪14が内周方向に押し付けられる。このとき、嵌合部3bの立ち上がり面3baに嵌合部14aの立ち上がり面14aaが当接しつつ摺動し、内輪14が蒸気の流れ方向上流側に移動する。この結果、立ち上がり面3ba,14aa間の隙間が0となるとともに、立ち上がり面3bb,14ab間の隙間も0となり、嵌合部3b及び14aが確実に嵌合し、内輪14が静翼3に対して固定される。このように、簡単な構成で嵌合部が密着するので、タービン仕切板ひいてはタービンの信頼性が向上し、またタービン効率がアップする。   Thus, by providing the pressure supply groove, the upstream steam pressure is transmitted through the pressure supply groove a during turbine operation, and between the outer peripheral surface 14ac of the fitting portion 14a and the bottom surface 3bc of the fitting portion 3b. The inner ring 14 is pressed in the inner circumferential direction by this pressure. At this time, the rising surface 14aa of the fitting portion 14a contacts and slides on the rising surface 3ba of the fitting portion 3b, and the inner ring 14 moves upstream in the steam flow direction. As a result, the clearance between the rising surfaces 3ba and 14aa becomes 0, and the clearance between the rising surfaces 3bb and 14ab also becomes 0, so that the fitting portions 3b and 14a are securely fitted, and the inner ring 14 is against the stationary blade 3. Fixed. As described above, since the fitting portion comes into close contact with a simple configuration, the reliability of the turbine partition plate and thus the turbine is improved, and the turbine efficiency is improved.

なお、嵌合部14aの外周面14acと嵌合部3bの底面3bcとの間には板バネ20が設けられる。これは、タービン仕切板組立の便宜上、内輪を内周側に軽く押し付け固定した状態としておくものである。板バネ20の形状は、図5(a)に斜視図で示すように、帯状の板に所定の間隔で舌片状の切り起こし部20aを設けたものとする。板バネ20の材質としては、例えば耐熱合金であるInco718(インコネル社製)が用いられる。   In addition, the leaf | plate spring 20 is provided between the outer peripheral surface 14ac of the fitting part 14a, and the bottom face 3bc of the fitting part 3b. This is to keep the inner ring lightly pressed and fixed to the inner peripheral side for the convenience of assembling the turbine partition plate. As shown in the perspective view of FIG. 5A, the shape of the leaf spring 20 is assumed to be provided with tongue-like cut-and-raised portions 20a at predetermined intervals on a belt-like plate. As the material of the leaf spring 20, for example, Inco718 (manufactured by Inconel), which is a heat-resistant alloy, is used.

また、同図(b)に示すように、帯状の板を波形状に形成したものや、その他の形状のもの、例えば断面がC字形状をしたC型バネシールを用いても良い。図8に示すように、C型バネシール22を用いる場合は、その開口部22aを蒸気の流れ方向上流側に向けるように配設しておく。この場合、ノズル分割面から入り込む高圧蒸気圧により、当該シールが拡張変形することで、嵌合部3b(正確には嵌合部14aの外周面14acと嵌合部3bの底面3bcとの間)が押し広げられる。但し、ここでのノズル分割面とは、タービン周方向に配設される各静翼の、タービン径方向内側端部(いわゆるシュラウド)同士の隣接面のことである。   Further, as shown in FIG. 5B, a belt-shaped plate formed in a corrugated shape or other shapes, for example, a C-shaped spring seal having a C-shaped cross section may be used. As shown in FIG. 8, when the C-type spring seal 22 is used, the opening 22a is disposed so as to face the upstream side in the steam flow direction. In this case, the seal is expanded and deformed by the high-pressure vapor pressure entering from the nozzle dividing surface, so that the fitting portion 3b (precisely between the outer peripheral surface 14ac of the fitting portion 14a and the bottom surface 3bc of the fitting portion 3b). Will be spread. However, the nozzle dividing surface here is an adjacent surface between the turbine radial direction inner ends (so-called shrouds) of each stationary blade arranged in the turbine circumferential direction.

また、上述した帯状の板バネや波形状の板バネ,C型バネシール以外に、膨張材料,硬化型充填材等を用いても良い。膨張材料としては、静翼シュラウドや内輪の材料より線膨張率の大きい材料が選択される。膨張材料を用いる場合は、タービン運転中の熱膨張で嵌合部3bが押し広げられ、一方、硬化型充填材を用いる場合は、嵌合部3bに加圧注入することで嵌合部3bが押し広げられるので、何れの場合も立ち上がり面3ba,14aa間の隙間が0となるとともに、立ち上がり面3bb,14ab間の隙間も0となり、嵌合部3b及び14aが確実に嵌合し、内輪14が静翼3に対して固定される。   In addition to the above-described belt-like plate springs, wave-like plate springs, and C-type spring seals, an expansion material, a curable filler, or the like may be used. As the expansion material, a material having a higher linear expansion coefficient than the material of the stationary blade shroud or the inner ring is selected. In the case of using an expansion material, the fitting portion 3b is pushed and expanded by thermal expansion during turbine operation. On the other hand, in the case of using a curable filler, the fitting portion 3b is pressurized and injected into the fitting portion 3b. In either case, the gap between the rising surfaces 3ba and 14aa is zero, and the gap between the rising surfaces 3bb and 14ab is also zero, so that the fitting portions 3b and 14a are securely fitted, and the inner ring 14 Is fixed to the stationary blade 3.

また、図9に示すように、内輪14の嵌合凹部14bから嵌合部14aの外周面14acまで貫通するボルト孔14cを設け、嵌合凹部14b側からボルト23を締め込み、即ち螺合挿入して、その先端を静翼3の嵌合部3bの底面3bcへ押し当てる構成としても良い。ボルト23を底面3bcへ押し当てることにより、内輪14が内周方向に押し付けられる。このとき、嵌合部3bの立ち上がり面3baに嵌合部14aの立ち上がり面14aaが当接しつつ摺動するので、立ち上がり面3ba,14aa間の隙間が0となるとともに、立ち上がり面3bb,14ab間の隙間も0となり、内輪14が静翼3に対して固定される。このようなボルトによる押し付け構造は、タービン全周に渡って配設されている静翼各々に対応して設けられる。このように、ボルトを挿入し押し付けることで、簡単に立ち上がり面を密着させることが出来る。   Further, as shown in FIG. 9, a bolt hole 14c is provided to penetrate from the fitting recess 14b of the inner ring 14 to the outer peripheral surface 14ac of the fitting portion 14a, and the bolt 23 is tightened from the side of the fitting recess 14b, that is, screwed. And it is good also as a structure which presses the front-end | tip against the bottom face 3bc of the fitting part 3b of the stationary blade 3. FIG. The inner ring 14 is pressed in the inner circumferential direction by pressing the bolt 23 against the bottom surface 3bc. At this time, since the rising surface 14aa of the fitting portion 14a is in contact with the rising surface 3ba of the fitting portion 3b and slides, the clearance between the rising surfaces 3ba and 14aa becomes 0, and between the rising surfaces 3bb and 14ab. The clearance is also zero, and the inner ring 14 is fixed to the stationary blade 3. Such a pressing structure using bolts is provided corresponding to each stationary blade arranged over the entire circumference of the turbine. Thus, the rising surface can be easily brought into close contact by inserting and pressing the bolt.

また、図10に示すように、嵌合部3bと静翼3の外側とを連通するピース孔3cを設け、静翼3の外側からこのピース孔3cを通して、嵌合部14aの外周面14acと嵌合部3bの底面3bcとの間にコーキングピース24を打ち込む構成としても良い。このように、コーキングピース24を打ち込むことにより、内輪14が内周方向に押し付けられる。このとき、嵌合部3bの立ち上がり面3bbに嵌合部14aの立ち上がり面14aaが当接しつつ摺動するので、立ち上がり面3ba,14aa間の隙間が0となるとともに、立ち上がり面3bb,14ab間の隙間も0となり、内輪14が静翼3に対して固定される。   Further, as shown in FIG. 10, a piece hole 3 c that communicates between the fitting portion 3 b and the outside of the stationary blade 3 is provided, and the outer peripheral surface 14 ac of the fitting portion 14 a passes through the piece hole 3 c from the outside of the stationary blade 3. The caulking piece 24 may be driven between the bottom surface 3bc of the fitting portion 3b. Thus, by driving the caulking piece 24, the inner ring 14 is pressed in the inner circumferential direction. At this time, since the rising surface 14aa of the fitting portion 14a is in contact with the rising surface 3bb of the fitting portion 3b and slides, the gap between the rising surfaces 3ba and 14aa becomes 0, and between the rising surfaces 3bb and 14ab The clearance is also zero, and the inner ring 14 is fixed to the stationary blade 3.

このようなコーキングピースによる押し付け構造は、タービン全周に渡って配設される。なお、コーキングピースを打ち込む構造は、タービン入口側即ち蒸気の流れ方向上流側、或いはタービン出口側即ち蒸気の流れ方向下流側の、どちら側に設けても良い。同図ではタービン入口側に設けた様子を示している。このようなコーキングピースによる打ち込み構造は、タービン全周に渡って配設されている静翼各々に対応して設けられる。このように、コーキングピースを打ち込むことで、簡単に立ち上がり面を密着させることが出来る。   Such a pressing structure by the caulking piece is arranged over the entire circumference of the turbine. The structure for driving the caulking piece may be provided on either the turbine inlet side, that is, the upstream side in the steam flow direction, or the turbine outlet side, that is, the downstream side in the steam flow direction. The figure shows a state where it is provided on the turbine inlet side. Such a driving structure by the caulking piece is provided corresponding to each stationary blade disposed over the entire circumference of the turbine. In this way, the rising surface can be easily brought into close contact with the caulking piece.

また、図11に示すように、内輪14の外周面と静翼3のタービン径方向内側端面との隙間に、タービン入口側と出口側の両側から嵌合部14aの立ち上がり面14ab,14aaにかけて、コーキングピース25を打ち込む構成としても良い。このように、コーキングピース25を打ち込むことにより、内輪14と静翼3の隙間が押し広げられる。このとき、嵌合部3bの立ち上がり面3bbに嵌合部14aの立ち上がり面14aaが当接しつつ摺動するので、立ち上がり面3ba,14aa間の隙間が0となるとともに、立ち上がり面3bb,14ab間の隙間も0となり、内輪14が静翼3に対して固定される。このようなコーキングピースによる打ち込み構造は、タービン全周に渡って配設されている静翼各々に対応して設けられる。このように、コーキングピースを打ち込むことで、簡単に立ち上がり面を密着させることが出来る。   Further, as shown in FIG. 11, in the gap between the outer peripheral surface of the inner ring 14 and the turbine radial direction inner end surface of the stationary blade 3, from both the turbine inlet side and the outlet side to the rising surfaces 14ab and 14aa of the fitting portion 14a, The caulking piece 25 may be driven in. Thus, by driving the caulking piece 25, the gap between the inner ring 14 and the stationary blade 3 is pushed wide. At this time, since the rising surface 14aa of the fitting portion 14a is in contact with the rising surface 3bb of the fitting portion 3b and slides, the gap between the rising surfaces 3ba and 14aa becomes 0, and between the rising surfaces 3bb and 14ab The clearance is also zero, and the inner ring 14 is fixed to the stationary blade 3. Such a driving structure by the caulking piece is provided corresponding to each stationary blade disposed over the entire circumference of the turbine. In this way, the rising surface can be easily brought into close contact with the caulking piece.

図6は、本実施例に係るタービン仕切板の内輪及びその近辺の変形例を模式的に示す図である。ここでは矢印で示した蒸気の流れ方向下流側の立ち上がり面(タービン略径方向に立ち上がる面)、即ち嵌合部3bの立ち上がり面3ba及び嵌合部14aの立ち上がり面14aa、並びに蒸気の流れ方向上流側の立ち上がり面、即ち嵌合部3bの立ち上がり面3bb及び嵌合部14aの立ち上がり面14abが、それぞれアンダーカットとなる方向に傾斜した(テーパーを設けた)構成となっている。これにより、上流下流両側の傾斜面にて嵌合部3b及び14aがより確実にバランス良く嵌合する。   FIG. 6 is a diagram schematically showing a modification of the inner ring of the turbine partition plate according to the present embodiment and its vicinity. Here, the rising surface downstream of the steam flow direction indicated by the arrow (the surface rising in the substantially radial direction of the turbine), that is, the rising surface 3ba of the fitting portion 3b, the rising surface 14aa of the fitting portion 14a, and the upstream of the steam flow direction. The rising surface on the side, that is, the rising surface 3bb of the fitting portion 3b and the rising surface 14ab of the fitting portion 14a are each inclined in the direction of undercut (provided with a taper). As a result, the fitting portions 3b and 14a are more reliably fitted in a balanced manner on the inclined surfaces on both the upstream and downstream sides.

図7は、本実施例に係るタービン仕切板を蒸気の流れ方向上流側より見た図である。同図に示すように、仕切板15は、180度分ずつ上下に2分割された外輪8及び、90度分ずつ上下左右に4分割された内輪12の間に、上下それぞれにおいて静翼1が周方向から各嵌合部1a,1bで嵌合させつつ挿入されて成る。静翼1の奥側にはこれと同様にして図示しない各段の静翼2,3が配列されており、また内輪12の奥側にはこれと同様にして図示しない各段の内輪13,14が配列されている。なお、図中の下半分の静翼1については図示を省略している。   FIG. 7 is a view of the turbine partition plate according to the present embodiment as viewed from the upstream side in the steam flow direction. As shown in the figure, the partition plate 15 includes a stationary blade 1 on each of the upper and lower sides between an outer ring 8 divided into two parts vertically by 180 degrees and an inner ring 12 divided into four parts vertically and horizontally by 90 degrees. It is inserted from the circumferential direction while being fitted by the fitting portions 1a and 1b. Similarly to this, the stator blades 2, 3 of each stage not shown are arranged on the back side of the stator blade 1, and the inner rings 13, not shown of FIG. 14 are arranged. In addition, illustration is abbreviate | omitted about the stationary blade 1 of the lower half in the figure.

前記のように、内輪を上下のみならず左右に分割した構成とすることで、内輪の熱伸びを吸収することができる。この熱伸びは、内輪内周側に設けたシールとロータ軸との摺動により発生した熱が内輪に伝わり、内輪が周方向に膨張するものである。内輪が周方向に膨張すると、外周方向に広がって静翼を圧迫し、静翼を外輪と固定するコーキング16,17,18を押しつぶしてしまうという悪影響を及ぼす。そこで、左右に分割された内輪12の垂直合わせ面v間に隙間を設けることにより、内輪12の熱伸びを吸収する構成としている。これは内輪13,14についても同様である。また、もう一つの利点としては製作時の組立性が大幅に改善される。   As described above, the inner ring is divided not only into the upper and lower parts but also into the left and right parts, so that the thermal elongation of the inner ring can be absorbed. In this thermal elongation, heat generated by sliding between the seal provided on the inner peripheral side of the inner ring and the rotor shaft is transmitted to the inner ring, and the inner ring expands in the circumferential direction. When the inner ring expands in the circumferential direction, it has an adverse effect of spreading in the outer circumferential direction and pressing the stationary blades, and crushing the caulks 16, 17, and 18 that fix the stationary blades to the outer ring. Therefore, a configuration is adopted in which the thermal elongation of the inner ring 12 is absorbed by providing a gap between the vertical alignment surfaces v of the inner ring 12 divided into left and right. The same applies to the inner rings 13 and 14. Another advantage is that the assemblability during production is greatly improved.

内輪12と静翼1は、左右の水平合わせ面hにおいて、止めネジ19により周方向に対してネジ止め固定され、回り止めされている。これは内輪13,14及び静翼2,3についても同様である。そして、仕切板15が上下に2分割された状態でそれぞれ組み立てられた後、上下の外輪8における左右の水平合わせ面H同士が当接した状態(隙間0)で、上下の外輪8ひいては上下の仕切板15がボルト21により締結固定される。これにより、仕切板15が組み上げられる。   The inner ring 12 and the stationary blade 1 are screwed and fixed in the circumferential direction by a set screw 19 on the horizontal alignment surface h on the left and right sides to prevent rotation. The same applies to the inner rings 13 and 14 and the stationary blades 2 and 3. After the partition plate 15 is assembled in a state where it is divided into two vertically, the left and right horizontal alignment surfaces H of the upper and lower outer rings 8 are in contact with each other (gap 0), and the upper and lower outer rings 8 and the upper and lower The partition plate 15 is fastened and fixed by bolts 21. Thereby, the partition plate 15 is assembled.

このとき、上下の内輪12の水平合わせ面h同士の間には0.2mm程度までの隙間が生じる。そこで、予めこの水平合わせ面hに肉盛溶接を施しておき、上下の外輪8をボルト21により締結する際に、上下の内輪12の水平合わせ面h同士の間でこの肉盛溶接を押し潰す構成としても良い。これにより隙間が埋められ、水平合わせ面の気密を保つことができ、且つ倒れ量の低減に寄与できる。なお、同図では仕切板15内部に位置する止めネジ19及びボルト21を透視した状態で描いてある。   At this time, a gap of about 0.2 mm is generated between the horizontal alignment surfaces h of the upper and lower inner rings 12. Therefore, overlay welding is performed on the horizontal alignment surface h in advance, and when the upper and lower outer rings 8 are fastened by the bolts 21, the overlay welding is crushed between the horizontal alignment surfaces h of the upper and lower inner rings 12. It is good also as a structure. As a result, the gap is filled, the airtightness of the horizontal alignment surface can be maintained, and the amount of collapse can be reduced. In the drawing, the set screw 19 and the bolt 21 positioned inside the partition plate 15 are seen through.

以上の実施例で説明したように、本発明のタービン仕切板では、アリ溝嵌合部に圧力供給溝を設けて、蒸気圧力により内輪を内周方向に押し付ける構成とすることにより、溶接構造を用いることなく、タービン運転時には嵌合部の隙間を0とすることができる。これにより、内輪にて静翼を拘束することができる。   As described in the above embodiments, in the turbine partition plate of the present invention, a pressure supply groove is provided in the dovetail fitting portion, and the inner ring is pressed in the inner circumferential direction by the steam pressure, so that the welding structure is Without using, the gap of the fitting portion can be set to zero during turbine operation. Thereby, a stationary blade can be restrained with an inner ring.

具体的に説明すると、特に静翼の剛性が低い場合、つまり比較的細長い形状の場合には、静翼が蒸気圧力を受けると、静翼のタービン内側端部が、蒸気の流れ方向下流側へ大きく変位すると同時に外周方向へも変位することになる。そこで、内輪がバンド効果を発揮し、且つアリ溝嵌合部と圧力供給溝を設けることにより、内輪にて各静翼をタービン内側へと引っ張り、静翼のタービン内側端部の変位を抑え込み、弾性倒れ量を低減することができる。   More specifically, particularly when the stationary blade has low rigidity, that is, in a relatively elongated shape, when the stationary blade is subjected to steam pressure, the turbine inner end of the stationary blade moves downstream in the steam flow direction. At the same time, it is displaced in the outer circumferential direction. Therefore, the inner ring exerts the band effect, and by providing the dovetail fitting portion and the pressure supply groove, the inner ring pulls each stationary blade toward the inside of the turbine and suppresses the displacement of the turbine inner end of the stationary blade, The amount of elastic collapse can be reduced.

また、溶接を用いない構造とすることで、溶接不可能な高強度材料、例えばニッケルクロム鋼やニッケルクロムモリブデン鋼等を強度上最も厳しい静翼に使用することができるので、静翼の占めるスペースを削減してタービンの性能向上及びコンパクト化を図ることができる。   In addition, by adopting a structure that does not use welding, high strength materials that cannot be welded, such as nickel chrome steel and nickel chrome molybdenum steel, can be used for the most severe stator blades in terms of strength. The turbine performance can be improved and the size can be reduced.

その他、蒸気の流れ方向上流側に配置される静翼と、下流側に配置される静翼とでは、受ける蒸気圧力が異なるので、それに応じてアンダーカット面の傾斜角度を変え、嵌合力を調節するといった構成も可能である。   In addition, since the steam pressure received is different between the stationary blade arranged upstream of the steam flow direction and the stationary blade arranged downstream, the inclination angle of the undercut surface is changed accordingly to adjust the fitting force. It is also possible to configure such that.

なお、特許請求の範囲で言う駆動ガスは、実施例における蒸気に対応している。また、上記実施例では蒸気タービンについて説明し、駆動ガスである蒸気の圧力を嵌合部に導入する構成を示したが、本発明はガスタービンにおいても適用可能であり、例えばシール空気等の圧力を嵌合部に導入する構成とすることができる。   The driving gas referred to in the claims corresponds to the vapor in the embodiment. In the above embodiment, the steam turbine is described, and the configuration in which the pressure of the steam that is the driving gas is introduced into the fitting portion is shown. However, the present invention can also be applied to the gas turbine. It can be set as the structure which introduce | transduces into a fitting part.

本発明が適用される蒸気タービンの内部構造の一例を示す断面図。Sectional drawing which shows an example of the internal structure of the steam turbine to which this invention is applied. 本発明の実施例1に係るタービン仕切板の内輪及びその近辺の拡大断面図。1 is an enlarged cross-sectional view of an inner ring of a turbine partition plate and its vicinity according to a first embodiment of the present invention. 本実施例に係るタービン仕切板の内輪及びその近辺の詳細断面図。The detailed cross section of the inner ring | wheel of the turbine partition plate which concerns on a present Example, and its vicinity. 圧力供給溝を内輪外周側から見た一例を示す図。The figure which shows an example which looked at the pressure supply groove from the inner ring outer peripheral side. 板バネの形状を示す斜視図。The perspective view which shows the shape of a leaf | plate spring. 本実施例に係るタービン仕切板の内輪及びその近辺の変形例を示す図。The figure which shows the modification of the inner ring | wheel of the turbine partition plate which concerns on a present Example, and its vicinity. 本実施例に係るタービン仕切板を蒸気の流れ方向上流側より見た図。The figure which looked at the turbine partition plate which concerns on a present Example from the flow direction upstream. C型バネシールを用いたタービン仕切板の内輪及びその近辺の詳細断面図。The detailed cross-sectional view of the inner ring | wheel of the turbine partition plate using a C-type spring seal, and its vicinity. ボルトを用いたタービン仕切板の内輪及びその近辺の詳細断面図。The detailed cross section of the inner ring | wheel of the turbine partition plate using a volt | bolt, and its vicinity. 嵌合部にコーキングピースを用いた、タービン仕切板の内輪及びその近辺の詳細断面図。The detailed cross section of the inner ring | wheel of a turbine partition plate and its vicinity which used the caulking piece for the fitting part. 内輪と静翼との隙間にコーキングピースを用いた、タービン仕切板の内輪及びその近辺の詳細断面図。The detailed cross section of the inner ring | wheel of a turbine partition plate and its vicinity which used the caulking piece for the clearance gap between an inner ring | wheel and a stationary blade.

符号の説明Explanation of symbols

1〜3 静翼
4〜6 動翼
7 ロータ軸
8 外輪
9〜11 シール
12〜14 内輪
15 仕切板
16〜18 コーキング
19 止めネジ
20 板バネ
21,23 ボルト
22 C型バネシール
24,25 コーキングピース
1-3 Stator blade 4-6 Rotor blade 7 Rotor shaft 8 Outer ring 9-11 Seal 12-14 Inner ring 15 Partition plate 16-18 Caulking 19 Set screw 20 Leaf spring 21, 23 Bolt 22 C spring seal 24, 25 Caulking piece

Claims (11)

内径に向かう先端にアリ溝の第1嵌合部を有する静翼と、前記アリ溝に嵌合する第2嵌合部を有する内輪とを備えるタービン仕切板において、
少なくとも前記アリ溝の駆動ガス流れ方向下流側の面を、テーパーを設けたアンダーカット形状とし、前記第1嵌合部の面に前記第2嵌合部の面を当接するようにしたことを特徴とするタービン仕切板。
In a turbine partition plate comprising a stationary blade having a first fitting portion of a dovetail groove at a tip toward the inner diameter, and an inner ring having a second fitting portion fitted into the dovetail groove,
At least the surface on the downstream side of the dovetail groove in the driving gas flow direction has a tapered undercut shape, and the surface of the second fitting portion is in contact with the surface of the first fitting portion. Turbine partition plate.
前記第1嵌合部と前記第2嵌合部との間に前記駆動ガスの圧力を導入し、該圧力により前記内輪をその内周方向に押し付ける圧力供給溝を設けたことを特徴とする請求項1に記載のタービン仕切板。   The pressure supply groove for introducing the pressure of the driving gas between the first fitting portion and the second fitting portion and pressing the inner ring in the inner circumferential direction by the pressure is provided. Item 2. The turbine partition plate according to Item 1. 前記第1嵌合部と前記第2嵌合部との間に、前記内輪をその内周方向に押し付ける板バネを設けたことを特徴とする請求項1に記載のタービン仕切板。   The turbine partition plate according to claim 1, wherein a leaf spring is provided between the first fitting portion and the second fitting portion to press the inner ring in the inner circumferential direction. 前記第1嵌合部と前記第2嵌合部との間に、前記内輪をその内周方向に押し付けるバネシールを設けたことを特徴とする請求項1に記載のタービン仕切板。   2. The turbine partition plate according to claim 1, wherein a spring seal is provided between the first fitting portion and the second fitting portion to press the inner ring in an inner circumferential direction thereof. 前記第1嵌合部と前記第2嵌合部との間に、熱膨張により前記内輪をその内周方向に押し付ける膨張材料を設けたことを特徴とする請求項1に記載のタービン仕切板。   2. The turbine partition plate according to claim 1, wherein an expansion material that presses the inner ring in an inner circumferential direction thereof by thermal expansion is provided between the first fitting portion and the second fitting portion. 前記第1嵌合部と前記第2嵌合部との間に、前記内輪をその内周方向に押し付ける硬化型充填材を設けたことを特徴とする請求項1に記載のタービン仕切板。   2. The turbine partition plate according to claim 1, wherein a curable filler is provided between the first fitting portion and the second fitting portion to press the inner ring in an inner circumferential direction thereof. 前記内輪の内周側より前記第1嵌合部側へとボルトを螺合挿入し、該ボルトの先端を前記第1嵌合部に押し当てることにより、前記内輪をその内周方向に押し付けるようにしたことを特徴とする請求項1に記載のタービン仕切板。   A bolt is screwed and inserted from the inner peripheral side of the inner ring to the first fitting part side, and the tip of the bolt is pressed against the first fitting part so as to press the inner ring in the inner peripheral direction. The turbine partition plate according to claim 1, wherein the turbine partition plate is formed. 前記第1嵌合部と前記第2嵌合部との間にコーキングピースを挿入することにより、前記内輪をその内周方向に押し付けるようにしたことを特徴とする請求項1に記載のタービン仕切板。   2. The turbine partition according to claim 1, wherein a caulking piece is inserted between the first fitting portion and the second fitting portion to press the inner ring in an inner circumferential direction thereof. Board. 前記内輪の外周面と前記静翼のタービン径方向内側端面との間にコーキングピースを挿入することにより、前記内輪をその内周方向に押し付けるようにしたことを特徴とする請求項1に記載のタービン仕切板。   The caulking piece is inserted between the outer peripheral surface of the inner ring and the turbine radial direction inner end surface of the stationary blade, thereby pressing the inner ring in the inner peripheral direction. Turbine divider. 前記アリ溝の駆動ガス流れ方向上流側及び下流側の両方の面を、テーパーを設けたアンダーカット形状としたことを特徴とする請求項1に記載のタービン仕切板。   The turbine partition plate according to claim 1, wherein both the upstream and downstream surfaces of the dovetail groove in the driving gas flow direction have an undercut shape with a taper. 請求項1〜請求項10のいずれかに記載のタービン仕切板を備えたタービン。   A turbine comprising the turbine partition plate according to claim 1.
JP2005076711A 2004-03-24 2005-03-17 Turbine partition plate and turbine provided with the same Active JP4436273B2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008069776A (en) * 2006-09-11 2008-03-27 General Electric Co <Ge> Turbine nozzle assembly
ITFI20090151A1 (en) * 2009-07-08 2011-01-09 Enel Green Power Spa MODULAR STATIC PALLETED DISTRIBUTORS FOR GEOTHERMAL TURBINES WITH ACTION AND REACTION
WO2012057309A1 (en) * 2010-10-29 2012-05-03 三菱重工業株式会社 Turbine and method for manufacturing turbine
EP2412931A3 (en) * 2010-07-28 2017-12-20 General Electric Company Composite Vane Mounting
CN109441568A (en) * 2018-11-16 2019-03-08 华电电力科学研究院有限公司 A kind of efficient low voltage partition plate covering device and its assembly method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008069776A (en) * 2006-09-11 2008-03-27 General Electric Co <Ge> Turbine nozzle assembly
ITFI20090151A1 (en) * 2009-07-08 2011-01-09 Enel Green Power Spa MODULAR STATIC PALLETED DISTRIBUTORS FOR GEOTHERMAL TURBINES WITH ACTION AND REACTION
EP2412931A3 (en) * 2010-07-28 2017-12-20 General Electric Company Composite Vane Mounting
WO2012057309A1 (en) * 2010-10-29 2012-05-03 三菱重工業株式会社 Turbine and method for manufacturing turbine
JP2012097601A (en) * 2010-10-29 2012-05-24 Mitsubishi Heavy Ind Ltd Turbine and method for manufacturing turbine
US9551224B2 (en) 2010-10-29 2017-01-24 Mitsubishi Hitachi Power Systems, Ltd. Turbine and method for manufacturing turbine
CN109441568A (en) * 2018-11-16 2019-03-08 华电电力科学研究院有限公司 A kind of efficient low voltage partition plate covering device and its assembly method
CN109441568B (en) * 2018-11-16 2024-04-19 华电电力科学研究院有限公司 High-efficiency low-pressure baffle plate sleeve device and assembly method thereof

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