JPS6219562B2 - - Google Patents
Info
- Publication number
- JPS6219562B2 JPS6219562B2 JP6740482A JP6740482A JPS6219562B2 JP S6219562 B2 JPS6219562 B2 JP S6219562B2 JP 6740482 A JP6740482 A JP 6740482A JP 6740482 A JP6740482 A JP 6740482A JP S6219562 B2 JPS6219562 B2 JP S6219562B2
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- tie wire
- silver
- tie
- rotor
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims 1
- 229910000679 solder Inorganic materials 0.000 description 10
- 229910052709 silver Inorganic materials 0.000 description 7
- 239000004332 silver Substances 0.000 description 7
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005219 brazing Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000003378 silver Chemical class 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/22—Blade-to-blade connections, e.g. for damping vibrations
- F01D5/24—Blade-to-blade connections, e.g. for damping vibrations using wire or the like
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Description
【発明の詳細な説明】
本発明は、蒸気タービンロータ等の回転軸に組
立てられている動翼の共振を防止する為に設けら
れている動翼のタイワイヤ補修方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing a tie wire for a rotor blade that is installed on a rotating shaft of a steam turbine rotor or the like to prevent resonance of the rotor blade.
蒸気タービン低圧ロータの外観を第１図に示
す。動翼３は、蒸気が通過する段落にしたがい、
翼長が高くなり、最終段及び最終前段の動翼３に
は、タイワイヤ４と称される連結棒が動翼の中央
又は、外周寄りに設けられる。タイワイヤ４は動
翼の種類にもよるが、動翼約５〜10本を１グルー
プとして連結し、定格回転数における共振を防止
する効果がある。タイワイヤ４と動翼３を固定す
る方法としては、翼長によつて、銀ロー付で固定
する場合、ダンピング効果を目的とする為に、固
定せずルースにする場合、溶接によつて強固に固
定する場合がある。銀ロー付でタイワイヤ４を固
定した場合の第１図のＡ−Ａ断面を第２図に示
す。第２図は、動翼３を６本１グループとした例
であり、動翼３とタイワイヤ４は、銀ロー５を溶
かして、固定したものである。この銀ロー付タイ
ワイヤ４には、何等かの原因でごくまれに、き裂
６が生じることがあり、従来この対策として、第
３図及び第４図に示す様な円筒スリーブ７を取付
けて補修を実施してきた。従来の方法を第３図で
説明する。き裂６を削除した後、１グループの銀
ロー５を溶かして除去し、タイワイヤ４ａを回転
方向に移動し、さらに、タイワイヤ４ｂを反回転
方向に移動し、円筒スリーブ７が取付けられる間
隔を保つ。次に円筒スリーブ７の中に、タイワイ
ヤ４ａ，４ｂを入れ、所定のギヤツプ８を設けて
位置決めし、円筒スリーブ７とタイワイヤ４、さ
らに動翼３とタイワイヤ４を再度銀ロー５で銀ロ
ー付する。この従来の対策は、作業性が悪く時間
もかかる為、多大の費用が発生すると共に、再び
銀ロー付することにより、残留応力が発生し、き
裂が再発する可能性があることから、簡単で、信
頼性の高いタイワイヤの補修方法の開発が急務と
なつてきた。 Figure 1 shows the appearance of the steam turbine low-pressure rotor. The rotor blades 3 follow the stages through which the steam passes,
The blade length is increased, and connecting rods called tie wires 4 are provided in the final stage and pre-final stage rotor blades 3 at the center or near the outer periphery of the rotor blades. Depending on the type of rotor blades, the tie wire 4 connects approximately 5 to 10 rotor blades as one group, and has the effect of preventing resonance at the rated rotation speed. Depending on the length of the blade, the tie wire 4 and the moving blade 3 can be fixed using silver brazing, loosely without fixing for the purpose of damping effect, or firmly by welding. It may be fixed. FIG. 2 shows a cross section taken along the line AA in FIG. 1 when the tie wire 4 is fixed with silver solder. FIG. 2 shows an example in which six rotor blades 3 are arranged in one group, and the rotor blades 3 and tie wires 4 are fixed by melting silver solder 5. In rare cases, cracks 6 may occur in this silver brazed tie wire 4 for some reason. Conventionally, as a countermeasure against this problem, a cylindrical sleeve 7 as shown in FIGS. 3 and 4 is attached to repair the tie wire 4. has been carried out. The conventional method will be explained with reference to FIG. After removing the crack 6, one group of silver solder 5 is melted and removed, the tie wire 4a is moved in the rotational direction, and the tie wire 4b is further moved in the counter-rotation direction to maintain the interval at which the cylindrical sleeve 7 is attached. . Next, put the tie wires 4a and 4b into the cylindrical sleeve 7, set a predetermined gap 8 and position them, and then silver braze the cylindrical sleeve 7 and the tie wire 4, as well as the rotor blade 3 and the tie wire 4 again with the silver solder 5. . This conventional countermeasure is difficult to work with and takes a long time, resulting in a large amount of cost.Also, re-brazing with silver may generate residual stress and cause cracks to reoccur. Therefore, there is an urgent need to develop a reliable method for repairing tie wires.
本発明の目的は、容易で、信頼性の高い動翼タ
イワイヤの補修方法を提供することにある。 An object of the present invention is to provide an easy and reliable method for repairing rotor blade tie wires.
本発明は、薄い板を曲げてタイワイヤのき裂６
を包む様なスリーブ構造を採用することにより、
従来の様なタイワイヤを移動する作業及び１グル
ープ間の再銀ロー付作業がなくなり、作業性の改
善を図るものである。 The present invention bends a thin plate and cracks the tie wire 6.
By adopting a sleeve structure that wraps around the
This eliminates the conventional work of moving tie wires and re-silvering between groups, improving work efficiency.
更にき裂入つた所のみをスリーブで包むこと
は、タイワイヤの１グループとしては、残留応力
が解放された形で補修でき、信頼性が向上され
る。実際に１グループのモデルにて、本発明の残
留応力を測定した所、従来の方法より、1/5以下
に低減することが出来た。又、毛管現象によつ
て、スリーブとタイワイヤの中に銀ローが入り易
く、引張強度も十分である。 Furthermore, by wrapping only the cracked part with a sleeve, as a group of tie wires, it is possible to repair the tie wire in a manner in which residual stress is released, and reliability is improved. When we actually measured the residual stress of the present invention using one group of models, we were able to reduce it to 1/5 or less compared to the conventional method. Furthermore, the silver solder easily enters the sleeve and tie wire due to capillary action, and the tensile strength is sufficient.
本発明の一実施例である動翼のタイワイヤ補修
法を第５図〜第８図において説明する。 A tie wire repair method for a rotor blade, which is an embodiment of the present invention, will be explained with reference to FIGS. 5 to 8.
第７図、第８図は、本発明のスリーブ７ａの取
付方法の説明図であり、第５図及び第５図のＢ−
Ｂ断面である。第６図は、本発明のスリーブ７ａ
が銀ロー付されている状況の図である。本発明の
補修方法を作業手順に従つて説明する。第５図に
おいて、動翼３ａの腹側銀ロー偶肉に、き裂６が
入つている場合を例にとると、まず第１に、動翼
３ａの腹側と背側の銀ロー５を除去し、ペーパー
できれいに仕上げる。次に薄い板をＵ字形に曲
げ、き裂６にあてがうように、セツトする。その
状況を第７図に示す。次に第８図に示す様に、外
周側を丸め、タイワイヤ４に密着させる。この作
業を完全にする為には、きわめて薄い板で、伸び
の大きい材料で、適当な強度のある材料を使う必
要がある。次に銀ロー付作業となるが、まず初め
に、第６図に示すように、外周側のスリツトの所
に銀ロー５を溶かし込む。これにより、き裂６の
間、スリーブ７ａとタイワイヤ４の間に、銀ロー
が入り、十分に接着されることができる。次に動
翼３ａとタイワイヤ４とスリーブ７ａを銀ロー付
する。最後に、銀ロー付部を仕上げる。 7 and 8 are explanatory diagrams of the method of attaching the sleeve 7a of the present invention, and are B--B in FIGS. 5 and 5.
This is the B cross section. FIG. 6 shows a sleeve 7a of the present invention.
This is a diagram showing a situation in which is soldered with silver. The repair method of the present invention will be explained according to the work procedure. In FIG. 5, taking as an example a case where there is a crack 6 in the ventral side silver solder fillet of the moving blade 3a, first of all, the silver solder 5 on the ventral side and the dorsal side of the moving blade 3a is Remove and clean with paper. Next, bend the thin plate into a U shape and set it so that it is applied to the crack 6. The situation is shown in Figure 7. Next, as shown in FIG. 8, the outer circumferential side is rounded and brought into close contact with the tie wire 4. In order to complete this task, it is necessary to use an extremely thin plate, a material with high elongation, and a material with appropriate strength. Next comes the silver brazing work. First, as shown in FIG. 6, silver solder 5 is melted into the slit on the outer circumferential side. As a result, the silver solder can enter between the cracks 6 and between the sleeve 7a and the tie wire 4, allowing sufficient adhesion. Next, the rotor blade 3a, tie wire 4, and sleeve 7a are silver-brazed. Finally, finish the silver brazed parts.
本発明によれば、作業性が良く、且つ補修が容
易になり、従来の方法と比較して、残留応力が軽
減されることにより、再発ポテンシヤルがきわめ
て少なく、信頼性が一段と向上する動翼のタイワ
イヤ補修法が実現出来るという効果を奏する。 According to the present invention, the rotor blade has good workability and is easy to repair, and the residual stress is reduced compared to the conventional method, so the recurrence potential is extremely small and the reliability is further improved. This has the effect that a tie wire repair method can be realized.
第１図は蒸気タービン低圧ロータの概略図、第
２図は第１図のタイワイヤのＡ−Ａ断面図、第３
図は従来のスリーブ補修法を示すタイワイヤの部
分図、第４図は従来のスリーブ形状図、第５図は
本発明の一実施例である動翼のタイワイヤ補修法
を示すタイワイヤの部分図、第６図は本発明のス
リーブ形状図、第７図及び第８図はそれぞれ本発
明のスリーブ取付状況を示す斜視図である。
１……タービン軸、２……ホイール、３，３ａ
……動翼、４，４ａ，４ｂ……タイワイヤ、５…
…銀ロー、６……き裂、７……円筒スリーブ、７
ａ……クランプ式スリーブ、８……ギヤツプ。
Figure 1 is a schematic diagram of a steam turbine low-pressure rotor, Figure 2 is a sectional view taken along line A-A of the tie wire in Figure 1, and Figure 3 is a cross-sectional view of the tie wire in Figure 1.
Figure 4 is a partial view of a tie wire showing a conventional sleeve repair method, Figure 4 is a diagram of a conventional sleeve shape, Figure 5 is a partial view of a tie wire showing a tie wire repair method for a rotor blade according to an embodiment of the present invention, FIG. 6 is a diagram showing the shape of the sleeve of the present invention, and FIGS. 7 and 8 are perspective views showing how the sleeve of the present invention is attached. 1... Turbine shaft, 2... Wheel, 3, 3a
... Moving blade, 4, 4a, 4b ... Tie wire, 5...
...Silver solder, 6...Crack, 7...Cylindrical sleeve, 7
a...Clamp type sleeve, 8...Gap.
Claims (1)
動翼間を相互に連結している動翼のタイワイヤに
おいて、前記タイワイヤに損傷が生じた場合に、
該損傷部の外周に平板を曲げてこの損傷部を包む
スリーブを取付け、前記スリーブの端面間のスリ
ツト部及び前記スリーブの両端を動翼面に銀ロー
付して補修することを特徴とする動翼のタイワイ
ヤ補修法。1. In the case where damage occurs to the tie wire of the rotor blade that interconnects a plurality of rotor blades that are attached radially around the outer circumference of the rotating shaft,
A driving mechanism characterized in that a sleeve is attached to the outer periphery of the damaged part by bending a flat plate to cover the damaged part, and the slit part between the end faces of the sleeve and both ends of the sleeve are silver-brazed to the rotor blade surface to repair the damaged part. Wing tie wire repair method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6740482A JPS58185902A (en) | 1982-04-23 | 1982-04-23 | Repairing of tie wire of moving blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6740482A JPS58185902A (en) | 1982-04-23 | 1982-04-23 | Repairing of tie wire of moving blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58185902A JPS58185902A (en) | 1983-10-29 |
| JPS6219562B2 true JPS6219562B2 (en) | 1987-04-30 |
Family
ID=13343964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6740482A Granted JPS58185902A (en) | 1982-04-23 | 1982-04-23 | Repairing of tie wire of moving blade |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58185902A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0676762B2 (en) * | 1987-07-16 | 1994-09-28 | 株式会社東芝 | Method for repairing cutting part of lacing wire |
-
1982
- 1982-04-23 JP JP6740482A patent/JPS58185902A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58185902A (en) | 1983-10-29 |
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