JPS63111205A - Method of repairing steam turbine blade - Google Patents

Method of repairing steam turbine blade

Info

Publication number
JPS63111205A
JPS63111205A JP25580186A JP25580186A JPS63111205A JP S63111205 A JPS63111205 A JP S63111205A JP 25580186 A JP25580186 A JP 25580186A JP 25580186 A JP25580186 A JP 25580186A JP S63111205 A JPS63111205 A JP S63111205A
Authority
JP
Japan
Prior art keywords
blade
turbine blade
turbine
repairing
groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP25580186A
Other languages
Japanese (ja)
Inventor
Izumi Matsuo
泉 松尾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP25580186A priority Critical patent/JPS63111205A/en
Publication of JPS63111205A publication Critical patent/JPS63111205A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P6/00Restoring or reconditioning objects
    • B23P6/002Repairing turbine components, e.g. moving or stationary blades, rotors

Landscapes

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

Abstract

PURPOSE:To enable repairs to be carried out easily and efficiently by cutting off the blade effective part of a damaged turbine blade before a groove extending in the axial direction is provided on the blade implanted part of said blade, and then attaching a turbine blade for repairing by utilizing said groove. CONSTITUTION:In the case where a vast number of turbine blades 5 are implanted into a blade implanted part 9 which is placed in a dovetail provided over the circumference of a rotating disc 3, if a damage is caused to the turbine blade 5, both a blade effective part 8A which sustained damage and the adjacent blade effective part 8 to the above, to which a damaged shroud 11A is attached, are scraped off. Subsequently, on the remaining blade implanted part 9 is provided a blade repairing groove 20 extending in the axial direction, and then, a turbine blade 22 for repairing, which has a blade implanted part 21 to be engaged with the blade repairing groove 20, is attached from the direction of the axis. In addition, to the tip of the newly attached turbine blade 22 for repairing is attached a shroud 11, and further, a tenon 10 on the tip of said turbine blade 22 for repairing is fixed by way of calking so that the repairing operations are brought to an end.

Description

【発明の詳細な説明】 〔発明の目的〕 (産業上の利用分野) 本発明は損傷した蒸気タービン羽根の補修方法に係り、
特に地熱タービン羽根の補性に好適な蒸気タービン羽根
の補修方法に関する。
[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method for repairing damaged steam turbine blades,
In particular, the present invention relates to a steam turbine blade repair method suitable for repairing geothermal turbine blades.

(従来の技術) 従来の地熱タービンの構造を第6図から第10図を用い
て説明する。
(Prior Art) The structure of a conventional geothermal turbine will be explained using FIGS. 6 to 10.

従来の地熱タービンはタービンケーシング1内に回転@
2が備えられ、その回転軸2の一部に回転円板3が段(
)られる。この回転円板3の外周には羽根取付用タブテ
ィル4が周方向に設けられ、このダブティル4に多数の
タービン羽根5が植設される。羽根取付用ダブティル4
は周方向の一部にタービン羽根5を取り付【ノ、あるい
は取り外づための切欠(図示せず)を有し、タービン羽
根5は羽根取付用ダブティル4に沿って周方向にスライ
ド可能に構成される。
A conventional geothermal turbine rotates inside the turbine casing 1.
2, and a rotating disk 3 is mounted on a part of the rotating shaft 2 (
) can be done. A tabill 4 for attaching blades is provided in the circumferential direction on the outer periphery of the rotary disk 3, and a large number of turbine blades 5 are installed in this dovetail 4. Dovetail 4 for blade attachment
has a notch (not shown) for attaching or removing the turbine blade 5 in a part of the circumferential direction, and the turbine blade 5 can be slid in the circumferential direction along the blade attachment dovetail 4. configured.

タービン羽根5は羽根有効部8と羽根(111込部9と
から成り、タービン羽根5の先端にテノン10を右して
いる。タービン羽根5の先端部はシュラウド11にて覆
われており、このシュラウド11はタービン羽根5先端
部のテノン10をかしめることによりタービン羽根5に
取り付けられ、夕一ピン羽根5を補強している。シュラ
ウド11は通常複数枚のタービン羽根5を1枚で綴じて
いる。
The turbine blade 5 consists of a blade effective part 8 and a blade (111 included part 9), and a tenon 10 is placed at the tip of the turbine blade 5.The tip of the turbine blade 5 is covered with a shroud 11. The shroud 11 is attached to the turbine blade 5 by caulking the tenon 10 at the tip of the turbine blade 5, and reinforces the Yuichi pin blade 5.The shroud 11 is usually made by binding a plurality of turbine blades 5 into one. There is.

タービンケーシング1内の回転円板3の上流側にノズル
12が設【ノられ、このノズル12の羽根有効部8に対
応する位買にノズルダイアフラム13が備えられる。
A nozzle 12 is provided on the upstream side of the rotating disk 3 within the turbine casing 1, and a nozzle diaphragm 13 is provided at a position corresponding to the blade effective portion 8 of the nozzle 12.

上記地熱タービンにより発電を行なう場合には、地中よ
り噴出した地熱空気Aをタービンケーシング1内のノズ
ル12の上流側へ導く。導かれた地熱空気Aはノズルダ
イアフラム13を通過する際に減圧増速し、タービン羽
根5の羽根有効部8へ高速で噴出し、回転円板3、回転
軸2を回転させて発Yi機をまわす。
When generating electricity using the geothermal turbine, geothermal air A ejected from underground is guided to the upstream side of the nozzle 12 in the turbine casing 1 . When the guided geothermal air A passes through the nozzle diaphragm 13, the pressure is reduced and the speed is increased, and it is ejected at high speed to the blade effective part 8 of the turbine blade 5, which rotates the rotating disk 3 and the rotating shaft 2 to generate the generator Yi. Turn it.

地熱空気A中には水蒸気の他に地中より噴出したスケー
ルや石等の異物が含まれている。また地中のガスも含ま
れており、その中にはタービン材料に対して腐食性を示
すガスも含まれている。そのため、これらの異物やガス
によりタービン羽根5の羽根有効部8やシュラウド11
が損傷を受けることが多い。
In addition to water vapor, the geothermal air A contains foreign substances such as scale and stones ejected from underground. It also contains underground gases, some of which are corrosive to turbine materials. Therefore, these foreign substances and gas damage the blade effective part 8 of the turbine blade 5 and the shroud 11.
is often damaged.

このような場合、従来の補修方法としては、全周のター
ビン羽根5を回転円板3より抜き取って、損傷を受けた
羽根だけを新しいタービン羽根5と交換して全周のター
ビン羽根5を再度回転円板3のダブティル4へ取り付け
る方法をとっている。
In such a case, the conventional repair method is to remove the entire circumference of the turbine blade 5 from the rotating disk 3, replace only the damaged blade with a new turbine blade 5, and then reinstall the entire circumference of the turbine blade 5. A method is adopted in which the rotary disk 3 is attached to the dovetail 4.

このためには、シュラウド11を固定しているテノン1
0のかしめ部を削り取り、シュラウド11を取り外す必
要がある。したがって、タービン羽根5を回転円板3に
再度取り付けた後、新しいシュラウド11を取り付(プ
る際に、第9図のように形成されていたタービン羽根5
先端部を第10図のように加工して新たな突起10Aを
形成する。
For this purpose, the tenon 1 that fixes the shroud 11 is
It is necessary to scrape off the caulked portion of 0 and remove the shroud 11. Therefore, after reattaching the turbine blade 5 to the rotating disk 3, when installing the new shroud 11, the turbine blade 5, which was formed as shown in FIG.
The tip is processed as shown in FIG. 10 to form a new protrusion 10A.

新しいシュラウド11は新たに形成されたテノン10A
をかしめてタービン羽根5に取り付けられる。
The new shroud 11 is a newly formed tenon 10A
It is attached to the turbine blade 5 by caulking.

(発明が解決しようとする問題点) 従来の地熱タービン羽根5の補修方法によれば、新たな
テノン10Δを形成ザるために羽根有効部8の棚15部
分をI’illり取るため羽根有効部8の^さが低くな
る。そのため、タービン羽根5の外周側に間隙が生じ、
ノズルダイアフラム13より噴出した蒸気がその間隙を
通して下流側へ漏れるため出力の低下の原因となってい
た。
(Problems to be Solved by the Invention) According to the conventional method for repairing the geothermal turbine blade 5, in order to form a new tenon 10Δ, the shelf 15 portion of the blade effective portion 8 is removed. Part 8's ^ becomes lower. Therefore, a gap is created on the outer peripheral side of the turbine blade 5,
Steam ejected from the nozzle diaphragm 13 leaks downstream through the gap, causing a reduction in output.

また、羽根有効部8の棚15部分を削り取ってしまうた
めに、新しいテノン10Aを形成することができるのは
一度だけである。したがって、−麿補修した後に別のタ
ービン羽根5に損傷が生じた場合には、再度この補修方
法ににり補修することはでき4Tかった。
Further, since the shelf 15 portion of the blade effective portion 8 is scraped off, a new tenon 10A can be formed only once. Therefore, if another turbine blade 5 is damaged after being repaired, it would be impossible to repair it again using this repair method.

本発明は従来のようにタービン羽根が損傷を受けた場合
に、損(セを受けていないタービン羽根を抜き取ること
なく、また突起を再形成することなく、何度でも補修が
可能な蒸気タービン羽根の補修方法を提供することを目
的とする。
The present invention provides a steam turbine blade that can be repaired any number of times without having to remove undamaged turbine blades or re-forming protrusions when a turbine blade is damaged as in the past. The purpose is to provide a repair method for

〔発明の構成〕[Structure of the invention]

(問題点を解決するための手段) 本発明に係る蒸気タービン羽根の補修方法は、蒸気ター
ビンの回転円板のダブティルにタービン羽根を植設して
組み立てられた蒸気タービン羽根の補修方法において、
損(口したタービン羽根の羽根有効部を切り取った後、
そのタービン羽根の羽根植込部に軸方向に溝を切り、そ
の溝に係合する羽根植込部を有する補修用タービン羽根
を取り伺けることを特゛徴とするものである。
(Means for Solving the Problems) A method for repairing a steam turbine blade according to the present invention is a method for repairing a steam turbine blade assembled by installing a turbine blade in a dovetail of a rotating disk of a steam turbine.
Loss (after cutting off the effective part of the turbine blade,
A feature of the present invention is that a groove is cut in the axial direction in the blade implantation portion of the turbine blade, and a repair turbine blade having the blade implantation portion that engages with the groove can be removed.

(作用) 損(セを受けていないタービン羽根を抜き取ることなく
、損傷を受けたタービン羽根とそれに隣接するタービン
羽根を加工するだけで、タービン羽根を補修することが
できる。また、何瓜でもタービン羽根の補修を行なうこ
とが可能である。
(Operation) Turbine blades can be repaired by simply processing the damaged turbine blade and the adjacent turbine blade without removing the undamaged turbine blade. It is possible to repair the blade.

(実施例) 本発明に係る蒸気タービン羽根の補修方法は地熱タービ
ン羽根の補修方法に好適に用いられ、その−実施例を第
1図ないし第5図を参照しながら説明する。
(Example) The method for repairing a steam turbine blade according to the present invention is suitably used as a method for repairing a geothermal turbine blade, and an example thereof will be described with reference to FIGS. 1 to 5.

第2図に示すにうなタービン羽根5に損傷が生じた場合
、損(口を受りた羽根有効部8Aと、これに隣接する損
傷を受1プだシュラウド11Aが取り付けられた羽根有
効部8とを削り取る(第3図参照)。次に、残った羽根
植込部9に軸方向の羽根補修溝20を形成する(第4図
参照)。この羽根補修溝20に係合する羽根植込部21
を右する補修用タービン羽根22を第1図および第5図
に示ずように軸方向から取り付ける。そして、新しく取
り付けた補修用タービン羽根22の先端部にシュラウド
11を取り付け、補修用タービン羽根22先端のテノン
10をかしめて固定する。第5図では第6図と同じ部材
には同一の符号を付して説明を省略する。
When damage occurs to the turbine blade 5 shown in FIG. (See Figure 3).Next, an axial blade repair groove 20 is formed in the remaining blade insert 9 (See Figure 4).The blade repair groove 20 that engages with this blade repair groove 20 is Part 21
Attach the repair turbine blade 22 on the right side from the axial direction as shown in FIGS. 1 and 5. Then, the shroud 11 is attached to the tip of the newly installed repair turbine blade 22, and the tenon 10 at the tip of the repair turbine blade 22 is fixed by caulking. In FIG. 5, the same members as in FIG. 6 are given the same reference numerals, and explanations thereof will be omitted.

本発明に係る蒸気タービン羽根の補修方法によれば、損
傷したタービン羽根5を補修する場合に、損(セしたタ
ービン羽根5とこれに隣接するタービン羽根5を除いて
は、他の大部分のタービン羽根5に手を加えたり、改造
したりする必要がない。
According to the method for repairing a steam turbine blade according to the present invention, when repairing a damaged turbine blade 5, most of the damage (except for the damaged turbine blade 5 and the adjacent turbine blade 5) There is no need to modify or modify the turbine blade 5.

また、タービン羽根5先端のテノン10を再形成する必
要がないので、何度でもタービン羽根5の補修を行なう
ことができる。
Furthermore, since there is no need to reshape the tenon 10 at the tip of the turbine blade 5, the turbine blade 5 can be repaired any number of times.

さらに、元の羽根植込部9はそのまま残っているので、
後日に何らかの理由によりタービン羽根5仝数を交換す
る場合にも、回転円板3の羽根取付用ダブティル4に沿
って補修したタービン羽根5を移動させて交換すること
ができる。
Furthermore, since the original blade implantation part 9 remains as it is,
Even if the number of turbine blades 5 is to be replaced for some reason at a later date, the repaired turbine blades 5 can be moved and replaced along the blade mounting dovetails 4 of the rotary disk 3.

上記の実施例は主に地熱タービン羽根の補修方法につい
て説明したが、本発明はこれに限定されず、一般の蒸気
タービン羽根の補修方法にも広く適用することが可能で
ある。
Although the above-mentioned embodiment mainly describes a method for repairing a geothermal turbine blade, the present invention is not limited thereto, and can be widely applied to a method for repairing a general steam turbine blade.

〔発明の効果〕〔Effect of the invention〕

本発明に係る蒸気タービン羽根の補修方法は、蒸気ター
ビンの回転円板のダブティルにタービン羽根をh’i設
して組み立てられた蒸気タービン羽根の補修方法におい
て、損傷したタービン羽根の羽根有効部を切り取った後
、そのタービン羽根の羽根植込部に軸方向に溝を切り、
その溝に係合する羽根植込部を有する補修用タービン羽
根を取り付けることとしたので、損傷したタービン羽根
とそれに隣接するタービン羽根を加工するだけでよく、
それ以外の大部分のタービン羽根については移動させた
り、加工したりする必要がない。
A method for repairing a steam turbine blade according to the present invention is a method for repairing a steam turbine blade assembled by installing a turbine blade on a dovetail of a rotating disk of a steam turbine. After cutting, cut a groove in the axial direction in the blade implant part of the turbine blade,
Since we decided to install a repair turbine blade that has a blade implant that engages with the groove, we only need to process the damaged turbine blade and the turbine blade adjacent to it.
Most other turbine blades do not need to be moved or modified.

また、従来のように羽根先端部を削って新たなテノンを
形成する必要がないので、何度でも補修を行なうことが
できるという効果がある。
Furthermore, since there is no need to shave off the tip of the blade to form a new tenon as in the past, there is the advantage that repairs can be carried out as many times as needed.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明に係る蒸気タービン羽根の補修方法の一
実施例により補修済のタービン羽根を示す図、第2図は
タービン羽根とシュラウドが損(口した状態を示す図、
第3図は上記実施例により羽根有効部を削り取った状態
を示す図、第4図は上記実施例により羽根植込部に軸方
向に羽根補修用溝を形成した状態を示寸図、第5図は上
記実施例により羽根を補修した地熱タービンの部分断面
図、第6図は従来の地熱タービンの部分断面図、第7図
は従来の地熱タービンのタービン羽根を羽根取付用溝に
取付【)た状態を示ず図、第8図は従来の地熱タービン
のタービン羽根を軸方向から見た図、第9図(A)は従
来のタービン羽根の先端部のテノンを示す図、第9図(
B)は第9図(A)のC−C矢視図、第10図(A)は
従来の補修方法により羽根先端部に新たにテノンを形成
した状態を示す図、第10図(B)は第10図(A)の
D−り矢視図である。 1・・・タービンケーシング、2・・・回転軸、3・・
・回転円板、4・・・ダブティル、5・・・タービン羽
根、8・・・羽根有効部、9・・・羽根植込部、10・
・・テノン、11・・・シュラウド、12・・・ノズル
、13・・・ノズルダイアフラム、20・・・羽根補修
用溝、21・・・羽根植込部、22・・・補修用タービ
ン羽根、A・・・地熱蒸気。 代理人弁理士  則 近 憲 佑 同        三  俣  弘  文羊 l 図 第 2 図 某 4 目 $5 図      茶6 図 某υ 図 羊 9 回 竿 io  図
FIG. 1 is a diagram showing a turbine blade repaired by an embodiment of the steam turbine blade repair method according to the present invention, and FIG. 2 is a diagram showing a state in which the turbine blade and shroud are damaged.
FIG. 3 is a diagram showing the state in which the effective part of the blade has been shaved off according to the above embodiment, FIG. The figure is a partial cross-sectional view of a geothermal turbine whose blades have been repaired according to the above embodiment, Figure 6 is a partial cross-sectional view of a conventional geothermal turbine, and Figure 7 shows the turbine blade of a conventional geothermal turbine installed in the blade mounting groove. Figure 8 is a view of the turbine blade of a conventional geothermal turbine viewed from the axial direction. Figure 9 (A) is a view showing the tenon at the tip of the conventional turbine blade.
B) is a view taken along the line C-C in FIG. 9(A), FIG. 10(A) is a diagram showing a state in which a tenon has been newly formed at the tip of the blade using the conventional repair method, and FIG. 10(B) is a view taken along the arrow D in FIG. 10(A). 1... Turbine casing, 2... Rotating shaft, 3...
・Rotating disk, 4... Dovetail, 5... Turbine blade, 8... Blade effective part, 9... Blade embedded part, 10.
... Tenon, 11... Shroud, 12... Nozzle, 13... Nozzle diaphragm, 20... Blade repair groove, 21... Blade implantation part, 22... Turbine blade for repair, A...Geothermal steam. Representative Patent Attorney Nori Chika Ken Yudo Hiroshi Mimata Fumiyo l Figure No. 2 Figure Certain 4 Items $5 Figure Brown 6 Figure Certain υ Figure Yang 9th round io Figure

Claims (1)

【特許請求の範囲】[Claims] 蒸気タービンの回転円板のタブティルにタービン羽根を
植設して組み立てられた蒸気タービン羽根の補修方法に
おいて、損傷したタービン羽根の羽根有効部を切り取っ
た後、そのタービン羽根の羽根植込部に軸方向に溝を切
り、その溝に係合する羽根植込部を有する補修用タービ
ン羽根を取り付けることを特徴とする蒸気タービン羽根
の補修方法。
In a method for repairing steam turbine blades assembled by installing turbine blades in the tabills of the rotating disk of a steam turbine, the effective blade part of the damaged turbine blade is cut out, and then the shaft is attached to the blade installation part of the turbine blade. A method for repairing a steam turbine blade, the method comprising cutting a groove in the direction of the blade and attaching a repair turbine blade having a blade embedded portion that engages with the groove.
JP25580186A 1986-10-29 1986-10-29 Method of repairing steam turbine blade Pending JPS63111205A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25580186A JPS63111205A (en) 1986-10-29 1986-10-29 Method of repairing steam turbine blade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25580186A JPS63111205A (en) 1986-10-29 1986-10-29 Method of repairing steam turbine blade

Publications (1)

Publication Number Publication Date
JPS63111205A true JPS63111205A (en) 1988-05-16

Family

ID=17283821

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25580186A Pending JPS63111205A (en) 1986-10-29 1986-10-29 Method of repairing steam turbine blade

Country Status (1)

Country Link
JP (1) JPS63111205A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010269433A (en) * 2009-05-25 2010-12-02 Able:Kk Method for machining caulking portion of implanted part in turbine rotor blade and machining apparatus therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010269433A (en) * 2009-05-25 2010-12-02 Able:Kk Method for machining caulking portion of implanted part in turbine rotor blade and machining apparatus therefor

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