JPH02248602A - Rotor of steam turbine - Google Patents
Rotor of steam turbineInfo
- Publication number
- JPH02248602A JPH02248602A JP6771589A JP6771589A JPH02248602A JP H02248602 A JPH02248602 A JP H02248602A JP 6771589 A JP6771589 A JP 6771589A JP 6771589 A JP6771589 A JP 6771589A JP H02248602 A JPH02248602 A JP H02248602A
- Authority
- JP
- Japan
- Prior art keywords
- dovetail
- disk
- clearance
- blade
- silicone rubber
- 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
Links
- 239000000853 adhesive Substances 0.000 claims abstract description 20
- 230000001070 adhesive effect Effects 0.000 claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 229920002379 silicone rubber Polymers 0.000 abstract description 11
- 239000004945 silicone rubber Substances 0.000 abstract description 11
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
- 238000005336 cracking Methods 0.000 abstract description 9
- 229920001971 elastomer Polymers 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 229920001296 polysiloxane Polymers 0.000 abstract description 2
- 239000000470 constituent Substances 0.000 abstract 1
- 229920000642 polymer Polymers 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 239000000945 filler Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は蒸気タービンに係り、特に、ロータの応力腐食
割れの防止に好適な蒸気タービンのロータに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a steam turbine, and particularly to a rotor of a steam turbine suitable for preventing stress corrosion cracking of the rotor.
従来、タービン・ロータのディスクとブレードを結合す
るブレード植込み部の間隙へのドレンの侵入を防ぐため
、特開昭５８−１８３８０１号公報に記−戦のように、
有機系樹脂の充填、又は、自己硬化ポリエステル樹脂、
嫌気性硬化ポリエステル・アクリル樹脂、自己硬化型エ
ポキシ樹脂のうちの一種、または、三種を複合してゴム
状エラストマ物質で変性された樹脂を充填していた。Conventionally, in order to prevent condensate from entering the gap between the blade implants that connect the disk and blade of a turbine rotor, as described in Japanese Patent Application Laid-Open No. 183801/1983,
Filling with organic resin or self-curing polyester resin,
It was filled with resin modified with a rubber-like elastomer material consisting of one or a combination of anaerobic curing polyester/acrylic resin and self-curing epoxy resin.
上記従来技術は、自己硬化性樹脂であるために、ロータ
の回転による間隙部の変形に追随することができず、短
期間のうちにひび割れ等を起す心配があった。また、カ
ーボンを含む有機系樹脂は。Since the above-mentioned conventional technology uses a self-curing resin, it cannot follow the deformation of the gap due to the rotation of the rotor, and there is a fear that cracks may occur in a short period of time. Also, organic resins containing carbon.
劣化による炭化があり、炭化によりできたカーボンは、
逆に、金属を腐食する要因となった。There is carbonization due to deterioration, and the carbon created by carbonization is
On the contrary, it became a factor that corroded metal.
本発明の目的は、鞍形タブテール構造のディスクとブレ
ード付根の間隙にドレンが侵入し、タービンの負荷変動
や起動・停止の繰返しによる侵入ドレン中のＤＯやＣ１
イオンの濃縮により、タブテールの応力腐食割れを起す
のを防ぐことにあり、このため、間隙部に１間隙の変形
によるひび割れなどの心配のない、また、カーボンを含
まない接着・充填剤を充填することにある。また、劣化
により接着力が無くなったときでも、ドレンの侵入が図
れるようにすることにある。It is an object of the present invention to prevent condensate from entering the gap between the disk and the blade root of the saddle-shaped tab tail structure, and to prevent DO and C1 in the condensate from entering due to load fluctuations and repeated startups and stops of the turbine.
The purpose is to prevent stress corrosion cracking of the tab tail due to ion concentration, and for this reason, the gap is filled with an adhesive/filler that does not contain carbon and does not cause cracks due to deformation of one gap. There is a particular thing. Another object is to allow drainage to penetrate even when adhesive strength is lost due to deterioration.
上記の目的は、シリコン鎖を持つ高分子シロキサンを主
成分とするシリコンゴム系接着剤を間隙部に充填するこ
とにより達成される。シリコンゴム系接着剤は非硬化性
のため１間隙部の変形に十分に追随でき、ひび割れの心
配はなく、Ｓｉ、Ｏ。The above object is achieved by filling the gap with a silicone rubber adhesive whose main component is a polymeric siloxane having silicone chains. Since the silicone rubber adhesive is non-curing, it can fully follow the deformation of one gap, and there is no worry about cracking.
Ｈ［子の化合物のため、分解しても金属腐食の問題はな
い、しかし、接着力はタービンの寿命である数十部のオ
ーダでは低下は否めない、このため、ブレード付根部、
および、ディスク溝を設け、溝の中にシリコン・ゴム系
接着剤を充填するか、または、紐状シリコン・ゴムを入
れ、ゴムの弾性によりシールすることにより、長期間、
この目的は達成される。Since it is a H[child compound, there is no problem of metal corrosion even if it is decomposed.However, the adhesive strength will inevitably decrease over the lifespan of the turbine, on the order of several tens of parts.For this reason, the blade root,
Then, by providing a disk groove and filling the groove with a silicone rubber adhesive, or by inserting a string-like silicone rubber and sealing it with the elasticity of the rubber, it can be used for a long period of time.
This objective is achieved.
鞍形タブテール部は複雑な３次元構造しているが、接着
剤を充める溝は工作上、単純にしなければならない、ド
レンの侵入によって応力腐食割が問題となるのは、タブ
テールの鞍部であるので、ドレンジルは、第１図の例に
あるように、隣接ブレードタブテールの腹背接触面と、
ブレードタブテール両足部のディスク円周と接するタブ
テール厚さ面である。この図面をシールすればよいこと
になる。この部分は溝加工も比較的容易であり、接着剤
充填も、ブレードを組立時に施工できるというメリット
もある。The saddle-shaped tab tail part has a complex three-dimensional structure, but the groove in which the adhesive is filled must be simple for manufacturing reasons.It is in the saddle part of the tab tail that stress corrosion cracking due to the intrusion of condensate becomes a problem. Therefore, the drain gill is connected to the ventrodorsal contact surface of the adjacent blade tab tail, as shown in the example of FIG.
This is the tab tail thickness surface that is in contact with the disk circumference of both legs of the blade tab tail. All you have to do is seal this drawing. Grooving in this part is relatively easy, and there is also the advantage that filling with adhesive can be done when the blade is assembled.
このような構造により、タービンの回転により。With such a structure, due to the rotation of the turbine.
遠心力によるディスク径の変形で、タブテール腹背面に
隙間が拡大しても、接着剤の弾力でシールされ、また、
タブテール両足部厚さ面も接着剤の伸びでシール性を失
うことはない。Even if a gap expands on the ventral surface of the tabtail due to the deformation of the disc diameter due to centrifugal force, the elasticity of the adhesive will seal it.
The thickness of both legs of the tab tail will not lose its sealing properties due to adhesive stretching.
しかし、接着剤は経年劣下により接着力が失なわれるの
で、遠心力により飛散を防ぐ必要があり、本発明による
溝構造とすればこの飛散を防ぐことができる。この場合
、弾力さえあれば、いわゆる０リングのようにドレンを
シールすることができる。However, since the adhesive loses its adhesive strength as it deteriorates over time, it is necessary to prevent it from scattering using centrifugal force, and the groove structure of the present invention can prevent this scattering. In this case, as long as there is elasticity, the drain can be sealed like a so-called O-ring.
以下１本発明の一実施例を第１図により説明する。ブレ
ード１の付根７は鞍形タブテール８によりディスク２に
取付けられている。３はシュラウドである。タブテール
８はブレード１側とディスク２側とに組立のため僅かな
間隙４をもっている。An embodiment of the present invention will be described below with reference to FIG. The root 7 of the blade 1 is attached to the disc 2 by a saddle-shaped tab tail 8. 3 is a shroud. The tab tail 8 has a slight gap 4 between the blade 1 side and the disk 2 side for assembly.
このため１間隙４にドレンが入ると、このドレンは、タ
ービンの負荷低下があれば、このブレードの段にも圧力
低下が起こり、ドレンは間隙４のまわりの金属の余熱に
より蒸発し、不純物が残されて１次に入って来るドレン
に溶は込み、これを繰り返えすことによって、この間隙
４のドレンは不純物が濃縮されて行き、ついに、Ｃｌイ
オン濃度と溶存酸素濃度が第２＠に示す応力腐食割れ発
生域に入ることになる。この現象はボイラ缶水純度を上
げても、負荷変動や起動停止が多いものは防ぐことが出
来ない。Therefore, when condensate enters gap 4, if there is a decrease in turbine load, a pressure drop will also occur in this blade stage, and the condensate will evaporate due to the residual heat of the metal around gap 4, and impurities will be removed. By repeating this process, impurities are concentrated in the drain in gap 4, and finally, the Cl ion concentration and dissolved oxygen concentration reach the second @. This results in the stress corrosion cracking occurring in the area shown in the figure. This phenomenon cannot be prevented even if the purity of boiler can water is increased if the load fluctuates or there are many startups and stops.
従って、この間隙部４にドレンが侵入しないように１間
隙部４に充填剤等を入れることは非常に有効な手段であ
る。Therefore, it is a very effective means to put a filler or the like into each gap 4 to prevent drain from entering the gap 4.
しかし、この間隙部は、ロータの高速回転のため、変形
し、タブテール外径で０．３ｍｍ近くも大きくなるもの
もあり、この変形に十分追随できる充填剤でなければな
らない、シリコンゴム系接着剤は、非硬化性ゴムの要求
を満足するものである。However, due to the high-speed rotation of the rotor, this gap deforms, and the outside diameter of the tab tail can increase by nearly 0.3 mm, so the filler must be able to fully follow this deformation, and the silicone rubber adhesive must be used as a filler. satisfies the requirements for non-curing rubber.
さらに、蒸気噴射流をサイクリックに受けているため、
その衝撃を、従来、タブテール部のダンピング効果で吸
収されていたが、この接着剤は非硬化性であるため、こ
のダンピング効果を高めることができるというメリット
も持たせることができる。Furthermore, because it receives the steam jet flow cyclically,
Conventionally, this impact has been absorbed by the damping effect of the tab tail portion, but since this adhesive is non-hardening, it can also have the advantage of increasing this damping effect.
しかし、接着力が年と共に低下してくることは止められ
ない、このため１本発明はブレード付根７に溝５を設け
、またディスク２に溝６を全周に設けて、この溝にシリ
コンゴム系接着剤を充填するか、又は、紐状のシリコン
系ゴムを挿入して、ゴムの弾性によりシールさせてドレ
ンの侵入を防止するものである。However, it is unstoppable that the adhesive strength decreases with age. Therefore, in the present invention, a groove 5 is provided at the blade root 7, and a groove 6 is provided on the entire circumference of the disk 2, and silicone rubber is applied to this groove. The system is filled with adhesive or inserted with string-like silicone rubber, and sealed by the elasticity of the rubber to prevent condensate from entering.
本発明によれば、鞍形タブテールのブレード付根とディ
スクの間隙部に、ドレンが侵入するのを防ぐことができ
るので、タブテール部の応力腐食割れを防ぐ効果があり
、更に、ドレン侵入防止のために、この間隙に充填され
る接着剤は弾力性があるため、間隙の変形にも十分に耐
えられ、また、ブレードのダンピング効果を増すことも
できる。According to the present invention, since it is possible to prevent condensate from entering the gap between the blade root of the saddle-shaped tab tail and the disk, there is an effect of preventing stress corrosion cracking of the tab tail portion. Moreover, since the adhesive filled in this gap is elastic, it can sufficiently withstand deformation of the gap, and can also increase the damping effect of the blade.
第１図は本発明の一実施例の断面図（ａ）および側面図
（ｂ）、第２図はドレンに含まれるＣ１イオン、及び、
溶存酸素の濃度関係における鋼材の応力腐食割れ発生域
と発生しない範囲の説明図である。
１・・・ブレード、２・・・ディスク、３・・・シュラ
ウド。
４・・・タブテール間隙、５・・・ブレード付根シール
溝、６・・・ディスク・シール溝、７・・・ブレード付
根。
帛２図FIG. 1 shows a cross-sectional view (a) and a side view (b) of an embodiment of the present invention, and FIG. 2 shows C1 ions contained in the drain and
FIG. 2 is an explanatory diagram of stress corrosion cracking occurrence areas and non-occurrence areas of steel materials in relation to dissolved oxygen concentration. 1...Blade, 2...Disc, 3...Shroud. 4... Tab tail gap, 5... Blade root seal groove, 6... Disk seal groove, 7... Blade root. Fragment 2
Claims (1)
する鞍形タブテール構造において、 前記ディスクと前記ブレードとを組合せたときにできる
間隙部に、カーボン分子を持たない非硬化性接着剤を充
填し、この間隙部にドレンが浸入しないようにしたこと
を特徴とする蒸気タービンのロータ。[Claims] 1. In a saddle-shaped tabtail structure that connects a disk and a blade of a steam turbine rotor, a non-hardening adhesive that does not have carbon molecules is used in a gap created when the disk and the blade are combined. A rotor for a steam turbine, characterized in that the rotor is filled with an agent to prevent drain from entering the gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6771589A JPH02248602A (en) | 1989-03-22 | 1989-03-22 | Rotor of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6771589A JPH02248602A (en) | 1989-03-22 | 1989-03-22 | Rotor of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02248602A true JPH02248602A (en) | 1990-10-04 |
Family
ID=13352933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6771589A Pending JPH02248602A (en) | 1989-03-22 | 1989-03-22 | Rotor of steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02248602A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001065499A (en) * | 1999-08-09 | 2001-03-16 | United Technol Corp <Utc> | Stator assembly for rotary machine |
-
1989
- 1989-03-22 JP JP6771589A patent/JPH02248602A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001065499A (en) * | 1999-08-09 | 2001-03-16 | United Technol Corp <Utc> | Stator assembly for rotary machine |
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