JPS61152911A - Turbine casing - Google Patents
Turbine casingInfo
- Publication number
- JPS61152911A JPS61152911A JP27323184A JP27323184A JPS61152911A JP S61152911 A JPS61152911 A JP S61152911A JP 27323184 A JP27323184 A JP 27323184A JP 27323184 A JP27323184 A JP 27323184A JP S61152911 A JPS61152911 A JP S61152911A
- Authority
- JP
- Japan
- Prior art keywords
- casing
- strength
- strength member
- external
- steam
- 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
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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/243—Flange connections; Bolting arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は蒸気タービンに係シ、特にタービンケーシング
の７ランジ構造を採用するものにおける蒸気漏洩防止効
果を高めるようにしたタービンケーシングに関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a steam turbine, and particularly to a turbine casing that enhances the steam leakage prevention effect in a turbine casing employing a seven-lunge structure.
一般に、タービンケーシングは高温高圧蒸気によって熱
応力、あるいは熱変形力の影響を受ける。Generally, a turbine casing is affected by thermal stress or thermal deformation force caused by high-temperature, high-pressure steam.
その為、ケーシング７ランジ面では継手ボルトがクリー
プを生じ、ネジ山部が変形したシ、摩耗して次第に弛み
、７ラン９面から蒸気が漏洩することが起っていた。そ
の対策として、従来漏洩発生時に継手ボルトの増締めし
てフランジ面圧を上げタリ、蒸気タービンを停止してフ
ランジ部のネジを機械加工によってサイズアップする等
の手段が行なわれている。As a result, the joint bolts would creep on the 7-run flange surface of the casing, and the threaded portion would become deformed and gradually loosen due to wear, causing steam to leak from the 7-run 9 surface. Conventional countermeasures include tightening the joint bolts to increase the flange surface pressure when a leak occurs, stopping the steam turbine, and increasing the size of the flange screws by machining.
第６図は従来から採用されているタービンケーシングの
７ランジ構造で、高圧タービン蒸気流入部の断面図を示
したものである。すなわち、ロータ１と同心にノズルボ
ックス２が設置されており、その外周には内部ケーシン
グ３が取付けられている。FIG. 6 shows a conventional seven-lunge structure of the turbine casing, and shows a cross-sectional view of the high-pressure turbine steam inlet. That is, a nozzle box 2 is installed concentrically with the rotor 1, and an internal casing 3 is attached to the outer periphery of the nozzle box 2.
ロータ１と同心の外部ケーシング４社、前記各部品を覆
っており、内部に高温高圧の蒸気が存在する圧力容器で
ある。高温高圧の蒸気は外部ケーシング４に接続した入
口管５を通り、外部ケーシング４とノズルボックス２と
を連結した伸縮管６を流れ、図示しないタービン段落内
へ流入する。The four outer casings are concentric with the rotor 1 and cover the above-mentioned parts, and are pressure vessels in which high-temperature, high-pressure steam exists. The high-temperature, high-pressure steam passes through an inlet pipe 5 connected to the outer casing 4, flows through a telescopic pipe 6 connecting the outer casing 4 and the nozzle box 2, and flows into a turbine stage (not shown).
前記の各構成部材は蒸気の漏れを防止するフランジ面を
数多く備えている。例えば、入口管５の場合、外部ケー
シング４の外表面に植込みボルト穴７を加工し、そこに
植込みボルト８を檎込んだ後、入口管５を設置し、ナツ
ト９で締付は固定している。また、ノズルボックス２、
内部ケーシング３、および外部ケーシング４の場合、ロ
ータ１の細心位置でそれぞれ上、下半に２分割される。Each of the aforementioned components has a number of flange surfaces to prevent steam leakage. For example, in the case of the inlet pipe 5, a stud hole 7 is machined on the outer surface of the external casing 4, a stud bolt 8 is inserted therein, the inlet pipe 5 is installed, and the nut 9 is tightened to secure it. There is. In addition, nozzle box 2,
In the case of the inner casing 3 and the outer casing 4, they are each divided into two halves, an upper half and a lower half, at the precise position of the rotor 1.
この分割面には内部ケーシング２の取付は例で示すよう
にフランジが形成され、ここを植込みポル） １０で固
定するようＫしている。これらの７ランジのうち入口管
５の７ランジ部を例にして以下に説明する。As shown in the example, a flange is formed on this split surface to which the inner casing 2 is attached, and is fixed with a stud 10. Among these seven flange portions, seven flange portions of the inlet pipe 5 will be described below as an example.
第６図の従来構造において、入口管５の７ランジ部は入
口管５および外部ケーシング４の熱的変形等によって植
込ボルト８に大きな力が加わる為に植込ボルト穴７のネ
ジ山が強度上、厳しい条件にある。一般的に植込ボルト
８は高強度の鍛鋼品が用いられておシ、変形や摩耗がわ
ずかであるが、植込ボルト穴７のネジ山の部分はケーシ
ング材の標準材料として鋳鋼品が多く用いられる関係上
、変形や摩耗に対して植込ボルト８並みの強度が得られ
ていない。In the conventional structure shown in FIG. 6, the 7 flange portion of the inlet pipe 5 has a strong thread in the stud bolt hole 7 because a large force is applied to the stud bolt 8 due to thermal deformation of the inlet pipe 5 and the external casing 4. Above, the conditions are severe. Generally, the stud bolt 8 is made of high-strength forged steel, which causes only slight deformation and wear, but the threaded portion of the stud bolt hole 7 is often made of cast steel, which is the standard material for the casing material. Due to its use, it does not have the same strength as the stud bolt 8 against deformation and wear.
ｊＩ７図はネジ山部分の耐摩耗性を表わしたものである
。破線がケーシング材のＣｒＭｏＶ 、 ＣｒＭｏ鋳鋼
品の場合のものを示し、一方、実線と一点鎖線とがｌＣ
ｒ０．５Ｍｏ系、１２Ｃｒ１Ｍｏ系の鍛鋼品のものを示
している。前者は後者に比べその値が明らかに劣ってい
る。一方変形に対しては、第８図で示した許容応力で比
較すると、鋳鋼品が鍛鋼品よシも強度が小さくなってお
夛、変形しゃすいことが明らかである。従って、第９図
で示すように植込ボルト穴７のネジ山は植込ボルト８の
変形郷による力が加わシ、図示の破線の通シ、変形と摩
耗が起こる。Figure jI7 shows the wear resistance of the threaded portion. The broken line shows the case of CrMoV and CrMo cast steel products as the casing material, while the solid line and the dashed-dotted line show the case of lC
Forged steel products of r0.5Mo series and 12Cr1Mo series are shown. The former is clearly inferior in value to the latter. On the other hand, with respect to deformation, when comparing the allowable stresses shown in FIG. 8, it is clear that cast steel products have lower strength than forged steel products and are more susceptible to deformation. Therefore, as shown in FIG. 9, the screw thread of the stud hole 7 is subjected to force due to the deformation of the stud bolt 8, causing threading, deformation, and wear as indicated by the broken lines in the figure.
その結界、第１０図に示したようにボルト締付力が小さ
くな夛、７ランジ面圧が低下して場合によっては７ラン
ジ部から蒸気が漏洩する危険性がある。As shown in FIG. 10, if the bolt tightening force is small, the surface pressure of the seventh flange may decrease, and there is a risk that steam may leak from the seventh flange.
本発明の目的は７−）ンジ部のネジ山の強度を高めるこ
とにより、経年的なボルト締付は力の低下によるフラン
ジ部からの蒸気漏れ発生を防止するようにしたタービン
ケーシングを提供するととくある。The object of the present invention is 7-) to provide a turbine casing that prevents steam leakage from the flange portion due to a decrease in bolt tightening force over time by increasing the strength of the threads of the flange portion. be.
本発明のタービンケーシングは、７ランジ部に座ぐシ穴
を設け、その中に高強度の鍛鋼材料でつくられた強度部
材を埋め込んで一体にし、その部位に植込みボルト穴を
形成してネジ山強度を高めるように構成したことを特徴
とするものである。In the turbine casing of the present invention, a countersunk hole is provided in the 7 flange portion, a strength member made of a high-strength forged steel material is embedded and integrated into the hole, and a stud bolt hole is formed in that portion to provide a screw thread. It is characterized by being constructed to increase strength.
以下、本発明を第１図に示す一実施例に基づいて説明す
る。なお、本発明は上述した従来の実施例と同一構成に
は、同じ符号を付して説明する。The present invention will be explained below based on an embodiment shown in FIG. Note that the present invention will be described with the same reference numerals assigned to the same components as those of the conventional embodiment described above.
第１図において、入口管５の７ランジ部にある植込みボ
ルト１１の植込みボルト穴のネジ山を高強度化する為に
１人口管５と同心で外部ケーシング４の内表面より、外
表面に向かって円筒形状の座ぐり穴１２を設け、その中
にリング状に加工した高強度の鍛鋼材料でつくられた強
度部材１３を埋め込む。取付法の一例として外部ケーシ
ング４の内面と強度部材１３との境界を溶接しく符号１
４）蒸気漏洩防止、廻り止め、落下防止等の対策を行な
い外部ケーシング４外側から通常の植込みボルトと同一
方法で植込ボルト穴１５を加工する。In FIG. 1, in order to increase the strength of the screw thread of the stud hole of the stud bolt 11 in the 7 flange portion of the inlet pipe 5, it is concentric with the 1st manifold pipe 5 and is directed from the inner surface of the outer casing 4 to the outer surface. A cylindrical counterbore hole 12 is provided, and a strength member 13 made of a ring-shaped high-strength forged steel material is embedded therein. As an example of the mounting method, the boundary between the inner surface of the outer casing 4 and the strength member 13 is welded.
4) Take measures to prevent steam leakage, rotation, and fall, and form stud bolt holes 15 from the outside of the external casing 4 using the same method as for ordinary stud bolts.
本発明は上記構成によるものであシ、従来の鋳鋼品相当
の材料で外部ケーシング４を構成するにも拘わらず、植
込ボルト穴１５については第７図、第８図で述べた高強
度鍛鋼品相当の材料で形成される為、ネジ山の変形、摩
耗が少なくなる。従って、ボルト締付は力の低下が生じ
ないので、蒸気漏洩の発生を防止することが可能となる
。The present invention is based on the above structure, and although the outer casing 4 is made of a material equivalent to conventional cast steel products, the stud holes 15 are made of high-strength forged steel as described in FIGS. 7 and 8. Since it is made of a material equivalent to that of a high quality product, there is less deformation and wear of the screw thread. Therefore, since there is no reduction in force when tightening the bolts, it is possible to prevent steam leakage.
次に、強度部材１３の形状についての他の実施例を＄２
ｒＩ！ＪＫ示す。本実施例では、強度部材１６を各植込
みポル）ＩＩＫ同心で外部ケーシング４の内表面より座
ぐシ穴１７を加工し、その中に強度部材１６を埋め込み
、外部ケーシング４と一体にする。本実施例においても
第１図のものと同様な働きが期待できることは前記実施
例の説明から容易に理解される。Next, another example regarding the shape of the strength member 13 will be described for $2.
rI! Show JK. In this embodiment, a countersink hole 17 is machined from the inner surface of the outer casing 4 concentrically with the reinforcing member 16, and the reinforcing member 16 is embedded therein to be integrated with the outer casing 4. It is easily understood from the description of the above embodiment that the present embodiment can also be expected to have the same function as that of FIG. 1.
なお、本発明の強度部材１６の取付方法は溶接法の他に
、第３図に）、（へ）に示すように止めネジ１８やかし
め（符号１９）Ｋよって固定しても良い。In addition to the welding method, the strength member 16 of the present invention may be fixed using a set screw 18 or a caulking (reference numeral 19) K as shown in FIGS.
一方、強度部材１３ 、１８の材料選択において外部ケ
ーシング４と強度部材１３．１６とで各々異なった熱膨
張係数のものを一体化すると、伸び差によって強度部材
１３．１６の溶接部１４、止めネジ１８、かしめ部１９
に応力が発生したシ、蒸気漏れの危険性がある為、はぼ
同一の熱膨張係数のものを選択することが重要である。On the other hand, when selecting materials for the strength members 13 and 18, if the outer casing 4 and the strength members 13.16 are integrated with different coefficients of thermal expansion, the welded portion 14 of the strength members 13.16 and the set screw due to the difference in expansion. 18, caulking part 19
It is important to select materials with approximately the same coefficient of thermal expansion, as there is a risk of steam leakage if stress is generated.
第４図は各種材料の熱膨張係数を示すが、ケーシング材
は大別すると１２Ｃｒ ＋ＣｒＭｏＶ ＊ ＣｒＭｏ鋳
鋼のフェライト系とステンレス鋳鋼のオーステナイト系
に別けられるが、熱膨張差が大きい為、問題となること
がわかる。そζで、強度部材１３．１６はフェライト系
もので１２ＣｒＭｏ 。Figure 4 shows the thermal expansion coefficients of various materials, and casing materials can be roughly divided into 12Cr + CrMoV * CrMo cast steel, which is ferritic, and stainless steel, which is austenitic.However, the difference in thermal expansion is large, which causes problems. I understand. In this case, the strength members 13 and 16 are made of ferrite and are made of 12CrMo.
ｌＣｒ０．５Ｍｏ系等のフェライト系鍛鋼品、オーステ
ナイト系ものでＡ２８６等のオーステナイト系鍛鋼品、
あるいは高温での強度が優れているＸ−７５０、Ｒｅｆ
２６ 、 Ｎｉｍｏ ８０Ａ等の超合金鋼が必要である
。Ferritic forged steel products such as lCr0.5Mo series, austenitic forged steel products such as A286,
Or X-750, Ref, which has excellent strength at high temperatures.
26, a superalloy steel such as Nimo 80A is required.
第４図は本発明のさらに異なる実施例で、内部ケーシン
グ３のフランジ部に採用した例を示す。FIG. 4 shows still another embodiment of the present invention, in which it is applied to the flange portion of the internal casing 3.
すなわち、７ランジの各ボルト配置部位に横面よシ水千
に座ぐり穴２０を加工し、強度部材２１を埋め込む。本
実施例においても前記と同一の作用を有するものである
。That is, a counterbore hole 20 is machined horizontally at each bolt placement site of the seven flange, and a strength member 21 is embedded. This embodiment also has the same effect as described above.
以上述べたように本発明はフランジ部の植込みボルト穴
部に強度部材を設けているので、ネジ山の変形、摩耗が
抑えられ、これによシボルト締付は力低下が防止される
為フランジ部からの蒸気漏れが少なくなり、蒸気タービ
ンの信頼性が向上し、優れたものとなる。As described above, since the present invention provides a strength member in the stud bolt hole of the flange part, deformation and wear of the screw threads are suppressed, and this prevents a decrease in force when tightening the bolt, so the flange part Steam leakage from the steam turbine is reduced, and the reliability of the steam turbine is improved.
第１図は本発明によるタービンケーシングの一実施例を
示す断面図、第２図は本発明の他の実施例を示す断面図
、第３図（ａ） 、 （ｂ）は本発明の強度部材を固定
方法に関する他の実施例を示す断面図、第４図は外部ケ
ーシング適用材料の熱膨張係数の、差を説明するための
図、第５図は本発明のさらに異なる実施例を示す断面図
、第６図は従来の蒸気タービンのフランジ部として蒸気
入口付近を示す断面図、第合図はフランジ部のネジ山材
質と耐摩耗度の関係を表わした比較線図、第４図はネジ
山材質とネジ山強度の関係を表わした比較線図、第ごつ
やあ、）、ヵ８６う、摩、。えよ、え、８゜−例を示す
説明図、第６図は従来技術において、フランジ部より蒸
気漏れが発生した様子を示す状態説明図である。
１・・・ロータ ２・・・ノズルボックス３・
・・内部ケーシング ４・・・外部ケーシング５・・・
入口管 ６・・・伸縮管７．１５・・・植込み
ボルト穴８，１０．１１・・・植込みボルト９・・・ナ
ツト １２ 、１７ 、２０・・・座ぐシ１３
．１６．２１・・・強度部材 １４・・・溶接部１８・
・・止めネジ １９・・・かしめ部代理人 弁理
士 則 近 憲 佑 （ほか１名）第１図
第 ２ 図
第 ３ 図
（α）（ｂ）
第 ４ 図
第５図
第 ６ 図FIG. 1 is a sectional view showing one embodiment of a turbine casing according to the present invention, FIG. 2 is a sectional view showing another embodiment of the present invention, and FIGS. 3(a) and (b) are strength members of the present invention. FIG. 4 is a diagram for explaining the difference in the coefficient of thermal expansion of the material applied to the external casing, and FIG. 5 is a cross-sectional diagram showing another embodiment of the present invention. , Fig. 6 is a cross-sectional view showing the vicinity of the steam inlet as the flange part of a conventional steam turbine, Fig. 6 is a comparison diagram showing the relationship between thread material of the flange part and wear resistance, and Fig. 4 is a diagram showing the relationship between thread material of the flange part and wear resistance. Comparison diagram showing the relationship between thread strength and screw thread strength. Fig. 6 is an explanatory diagram showing an example of 8 degrees. Fig. 6 is an explanatory diagram showing a state in which steam leakage occurs from a flange portion in the prior art. 1... Rotor 2... Nozzle box 3.
...Inner casing 4...Outer casing 5...
Inlet pipe 6... Telescopic pipe 7.15... Studded bolt hole 8, 10.11... Studded bolt 9... Nut 12, 17, 20... Spot seat 13
．． 16.21... Strength member 14... Welded part 18.
... Set screw 19 ... Caulking Department Agent Patent Attorney Noriyuki Chika (and 1 other person) Fig. 1 Fig. 2 Fig. 3 (α) (b) Fig. 4 Fig. 5 Fig. 6
Claims (1)
シングにおいて、前記フランジ部に座ぐり穴を設け、そ
の中に高強度の鍛鋼材料でつくられた強度部材を埋め込
んで一体にし、その部位に植込ボルト穴を形成してネジ
山強度を高めるように構成したことを特徴とするタービ
ンケーシング。In a turbine casing having a flange portion as a steam sealing surface, a counterbore hole is provided in the flange portion, a strength member made of a high-strength forged steel material is embedded and integrated into the hole, and a stud bolt hole is provided in that portion. A turbine casing characterized in that it is configured to form a thread to increase thread strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27323184A JPS61152911A (en) | 1984-12-26 | 1984-12-26 | Turbine casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27323184A JPS61152911A (en) | 1984-12-26 | 1984-12-26 | Turbine casing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61152911A true JPS61152911A (en) | 1986-07-11 |
Family
ID=17524944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27323184A Pending JPS61152911A (en) | 1984-12-26 | 1984-12-26 | Turbine casing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61152911A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010053976A (en) * | 2008-08-28 | 2010-03-11 | Hitachi Ltd | Bolt fastening structure |
| CN108443121A (en) * | 2018-05-28 | 2018-08-24 | 中国有色(沈阳)泵业有限公司 | A kind of diaphragm cavity configuration |
-
1984
- 1984-12-26 JP JP27323184A patent/JPS61152911A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010053976A (en) * | 2008-08-28 | 2010-03-11 | Hitachi Ltd | Bolt fastening structure |
| CN108443121A (en) * | 2018-05-28 | 2018-08-24 | 中国有色(沈阳)泵业有限公司 | A kind of diaphragm cavity configuration |
| CN108443121B (en) * | 2018-05-28 | 2024-06-04 | 中国有色(沈阳)泵业有限公司 | Diaphragm cavity structure |
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