JPH02173302A - Seal-fin mechanism at blade end of geothermal steam turbine static blade - Google Patents
Seal-fin mechanism at blade end of geothermal steam turbine static bladeInfo
- Publication number
- JPH02173302A JPH02173302A JP32516588A JP32516588A JPH02173302A JP H02173302 A JPH02173302 A JP H02173302A JP 32516588 A JP32516588 A JP 32516588A JP 32516588 A JP32516588 A JP 32516588A JP H02173302 A JPH02173302 A JP H02173302A
- Authority
- JP
- Japan
- Prior art keywords
- seal
- fins
- turbine
- axle
- blade
- 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.)
- Granted
Links
- 230000003068 static effect Effects 0.000 title abstract 3
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、地熱蒸気タービンの静翼がタービン車軸に近
接する部分に設けられるシールフィン構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a seal fin structure in which a stationary blade of a geothermal steam turbine is provided in a portion close to a turbine axle.
蒸気タービンの静翼は翼列をなしてタービン車軸に近接
してケーシングに取付けられ、タービン車軸に翼列をな
して取付けられる動翼と組合わされて段落を形成し、タ
ービン内に流入した蒸気を静翼にて膨張させて高速にし
、この高速の蒸気流を動翼に流入することによりタービ
ン車軸を回転している。したがって静翼とタービン車軸
との間にはタービン車軸の回転を可能にするために隙間
が設けられているが、静翼に流入する蒸気はこの隙間か
ら静翼をバイパスする洩れ蒸気となって流れるので、こ
の洩れ蒸気量を小さくするため、静翼がタービン車軸に
近接する部分にシールフィンが設けられる。このような
シールフィンとして従来第２図に示すものが知られてい
る。The stationary blades of a steam turbine are attached to the casing in a row close to the turbine axle, and in combination with the rotor blades, which are attached to the turbine axle in a row, form a stage and direct the steam flowing into the turbine. The stator blades expand the steam to a high speed, and the high-speed steam flow flows into the rotor blades to rotate the turbine axle. Therefore, a gap is provided between the stator blade and the turbine axle to allow rotation of the turbine axle, and steam flowing into the stator blade flows through this gap as leakage steam that bypasses the stator blade. Therefore, in order to reduce the amount of leaked steam, seal fins are provided in the portions of the stator blades that are close to the turbine axle. As such a seal fin, one shown in FIG. 2 is conventionally known.
第２図において１は図示しないタービンケーシングに取
付けられた翼列をなす静翼であり、その翼端部には中央
部に四部２ａ、両端に凸部２ｂを有する囲い輪リング２
が設けられている。３はタービン車軸であり、車軸面に
は円周にわたって溝４が設けられ、この溝４にシールフ
ィン６を挿入し、コーキングワイヤ７にてシールフィン
６を固定している。なおシールフィン６の高さは囲い輪
リング２の凹部２ａに臨むものは高く、凸部２ｂに臨む
ものは低くして囲い輪リング３との隙間を微小にし、こ
の隙間から静翼をバイパスする洩れ蒸気量を少なくして
漏洩損失を小さくしている。In FIG. 2, reference numeral 1 denotes a stationary blade that forms a row of blades attached to a turbine casing (not shown), and the blade end has a surrounding ring 2 having four parts 2a at the center and convex parts 2b at both ends.
is provided. Reference numeral 3 designates a turbine axle, and a groove 4 is provided on the axle surface over the circumference, a seal fin 6 is inserted into this groove 4, and the seal fin 6 is fixed with a caulking wire 7. The height of the seal fins 6 is high for those facing the concave portion 2a of the shrouding ring 2, and low for those facing the convex portion 2b to minimize the gap between the seal fins 6 and the shroud ring 3, and bypass the stationary blades through this gap. The leakage loss is reduced by reducing the amount of leaked steam.
地熱蒸気を作動流体とする地熱蒸気タービンにおいては
地熱蒸気中に腐食性を有する不純物を含み、この腐食性
不純物をタービンに流入しないように全部排除すること
はできない。したがってこの腐食性不純物と高速の蒸気
流との作用によるエロージョン、コロ−ジョンおよびタ
ービン車軸のシールフィン用の溝部の腐食により浸蝕が
発生し、タービン車軸に植込まれたシールフィンが欠落
してタービン車軸と静翼の翼端との間からの漏洩蒸気量
が大きくなり、タービン性能が低下するという問題があ
る。なお、これを防止するため従来シールフィンの厚さ
を厚くしたり、溝の深さを深くしているが、なお不十分
であった。In a geothermal steam turbine that uses geothermal steam as a working fluid, the geothermal steam contains corrosive impurities, and it is impossible to completely eliminate these corrosive impurities so that they do not flow into the turbine. Therefore, the action of these corrosive impurities and high-speed steam flow causes erosion and corrosion, and corrosion of the seal fin grooves on the turbine axle causes erosion, causing the seal fins embedded in the turbine axle to break off and cause the turbine to become damaged. There is a problem in that the amount of steam leaking between the axle and the tip of the stationary blade increases, resulting in a decrease in turbine performance. In order to prevent this, conventional methods have been to increase the thickness of the seal fins or increase the depth of the grooves, but these efforts are still insufficient.
本発明の目的は、シールフィンの欠落を防止し、シール
フィンを介して形成される静翼とタービン車軸との隙間
を確保することによりタービン性能低下を防ぐことので
きる地熱蒸気タービン静翼の翼端部シールフィン構造を
提供することである。It is an object of the present invention to provide a geothermal steam turbine stator vane that is capable of preventing deterioration in turbine performance by preventing seal fins from missing and ensuring a gap between the stator blades formed through the seal fins and the turbine axle. Another object of the present invention is to provide an end seal fin structure.
上記課題を解決するために、本発明によれば、地熱蒸気
タービンのタービン車軸に静翼が近接する部分に設けら
れるシールフィン構造において、静翼の翼端部の囲い輪
リングに突出する高さの異なる複数のシールフィンと、
このシールフィンのうち高さの低いシールフィンに臨む
タービン車軸に車軸の円周にわたって突出する突起部と
を設け、各シールフィンとタービン車軸との間の隙間を
微小にするものとする。In order to solve the above problems, according to the present invention, in a seal fin structure provided in a portion where a stator blade is close to a turbine axle of a geothermal steam turbine, a height protruding from a surrounding ring at a blade end of a stator blade is provided. multiple seal fins with different
A protrusion projecting over the circumference of the axle is provided on the turbine axle facing the seal fin with a lower height among the seal fins, thereby minimizing the gap between each seal fin and the turbine axle.
シールフィンは静翼翼端部の囲い輪リングから、また車
軸に設けられる突起部はタービン車軸から一体に削り出
して突出するため強固となり、エロージョンおよびコロ
−ジョンに対して強化されるので、シールフィンの欠落
がなくなり、タービンの性能低下を防止できる。The seal fin is made from the surrounding ring at the tip of the stator blade, and the protrusion provided on the axle is integrally machined and protrudes from the turbine axle, making it strong and reinforced against erosion and corrosion. This eliminates missing parts and prevents deterioration in turbine performance.
以下図面に基づいて本発明の実施例について説明する。 Embodiments of the present invention will be described below based on the drawings.
第１図は本発明の実施例による地熱蒸気タービン静翼の
翼端部シールフィン構造の部分断面図である。なお、第
１図において第２図の従来例と同一部品には同じ符号を
イ」シ、その説明を省略する。第１図において従来例と
異なるのは静翼１の囲い輪リング２から高さの高いシー
ルフィン８と高さの低いシールフィン９とを削り出し、
方タービン車軸３には高さの低いシールフィン９に対し
て車軸面３ａから円周にわたって突出する突起部１０を
削り出し、各シールフィン８．９とタービン車軸３との
隙間を微小にしたことである。FIG. 1 is a partial sectional view of a blade tip seal fin structure of a geothermal steam turbine stationary blade according to an embodiment of the present invention. In FIG. 1, parts that are the same as those in the conventional example shown in FIG. 2 are designated by the same reference numerals, and their explanations will be omitted. What is different from the conventional example in FIG. 1 is that a high seal fin 8 and a low seal fin 9 are cut out from the surrounding ring 2 of the stationary blade 1.
On the turbine axle 3, a protrusion 10 that protrudes from the axle surface 3a over the circumference is cut out for the low-height seal fin 9, and the gap between each seal fin 8.9 and the turbine axle 3 is made minute. It is.
このような構造によりシールフィン８，９と車軸面３ａ
、突起部１０との間の各隙間からの洩れ蒸気量が少なく
なるとともに、流入する地熱蒸気にょるエロージョンお
よびコロ−ジョンに対して強化され、シールフィンが欠
落することがなくなる。With this structure, the seal fins 8, 9 and the axle surface 3a
The amount of steam leaking from each gap between the seal fin and the protrusion 10 is reduced, the seal fin is strengthened against erosion and corrosion caused by inflowing geothermal steam, and the seal fins are prevented from coming off.
なお、静翼の翼巾が大きくなれば、シールフィン９と突
起部１０の対で数を増加することによりシール効果を高
めることができる。Incidentally, if the blade width of the stationary blade is increased, the sealing effect can be enhanced by increasing the number of pairs of seal fins 9 and protrusions 10.
なお、本実施例では反動タービンの静翼について説明し
たが静翼と同じ作用をする衝動タービンのノズルに本発
明を適用しても同し効果が得られる。In this embodiment, the stationary blades of a reaction turbine have been described, but the same effect can be obtained even if the present invention is applied to a nozzle of an impulse turbine that has the same function as a stationary blade.
以上の説明から明らかなように、本発明によれば静翼翼
端部の囲い輪リングに突出する高さの異なるシールフィ
ンを設け、高さの低いシールフィンに対するタービン車
軸には突起部を設けて各シールフィンとタービン車軸面
との間を微小隙間にすることにより、地熱蒸気タービン
に流入する地熱蒸気によるエロージョンおよびコロ−ジ
ョンに対して強化され、シールフィンの欠落がな（なる
ので、タービン性能低下を防止できる。As is clear from the above description, according to the present invention, seal fins of different heights protruding from the surrounding ring at the tip of the stator vane are provided, and a protrusion is provided on the turbine axle for the seal fin of low height. By creating a minute gap between each seal fin and the turbine axle surface, the geothermal steam turbine is strengthened against erosion and corrosion caused by the geothermal steam flowing into the turbine, and no seal fins are missing, thereby improving turbine performance. Deterioration can be prevented.
第１図は本発明の実施例による地熱蒸気タービン静翼の
翼端部シールフィン構造を示す部分断面図、第２図は従
来の地熱蒸気タービン静翼の翼端部シールフィ
ン構造を示す部分断面図である。
１：静翼、
２ ：
囲い輪す
ング、
９ ニ
ジールフィ
ン、
１０：
突起部。
一
第
図
第
図FIG. 1 is a partial sectional view showing the tip seal fin structure of a geothermal steam turbine stationary blade according to an embodiment of the present invention, and FIG. 2 is a partial sectional view showing the tip seal fin structure of a conventional geothermal steam turbine stationary blade. It is a diagram. 1: Stationary blade, 2: Surrounding ring, 9 Nijiru fin, 10: Protrusion. Figure 1 Figure 1
Claims (1)
部分に設けられるシールフィン構造において、静翼の翼
端部の囲い輪リングに突出する高さの異なる複数のシー
ルフィンと、このシールフィンのを、 うち高さの低いシールフィンに臨タービン車軸の円周に
わたって突出する突起部とを設け、各シールフィンとタ
ービン車軸との間の隙間を微小にしたことを特徴とする
地熱蒸気タービン静翼の翼端部シールフィン構造。[Claims] 1) In a seal fin structure provided in a portion where a stationary blade is close to a turbine axle of a geothermal steam turbine, a plurality of seal fins of different heights protrude from a surrounding ring at the tip of the stationary blade. The seal fins are characterized in that the lower seal fins are provided with protrusions that protrude over the circumference of the turbine axle, thereby minimizing the gap between each seal fin and the turbine axle. Seal fin structure at the tip of a geothermal steam turbine stationary blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63325165A JP2858697B2 (en) | 1988-12-23 | 1988-12-23 | Tip fin structure of geothermal steam turbine vane tip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63325165A JP2858697B2 (en) | 1988-12-23 | 1988-12-23 | Tip fin structure of geothermal steam turbine vane tip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02173302A true JPH02173302A (en) | 1990-07-04 |
| JP2858697B2 JP2858697B2 (en) | 1999-02-17 |
Family
ID=18173742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63325165A Expired - Fee Related JP2858697B2 (en) | 1988-12-23 | 1988-12-23 | Tip fin structure of geothermal steam turbine vane tip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2858697B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002180802A (en) * | 2000-12-11 | 2002-06-26 | Mitsubishi Heavy Ind Ltd | Stationary blade in steam turbine |
| EP1331362A2 (en) * | 2002-01-28 | 2003-07-30 | Kabushiki Kaisha Toshiba | Geothermal steam turbine |
| JP2009216047A (en) * | 2008-03-12 | 2009-09-24 | Fuji Electric Systems Co Ltd | Method of coating turbine |
| JP2013194686A (en) * | 2012-03-22 | 2013-09-30 | Mitsubishi Heavy Ind Ltd | Turbine, and seal member, moving blade, stator blade, rotor and casing thereof |
| US11105213B2 (en) | 2015-12-09 | 2021-08-31 | Mitsubishi Power, Ltd. | Seal fin, seal structure, turbo machine, and method for manufacturing seal fin |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1220904A (en) * | 1968-10-28 | 1971-01-27 | Westinghouse Electric Corp | Diaphragm seal structure |
| JPS4956009A (en) * | 1972-09-29 | 1974-05-30 | ||
| JPS51116304A (en) * | 1975-04-04 | 1976-10-13 | Hitachi Ltd | Moving root fin |
| JPS5284351A (en) * | 1975-12-30 | 1977-07-13 | Hitachi Ltd | Axial sealer for rotor |
| JPS5540237A (en) * | 1978-09-13 | 1980-03-21 | Toshiba Corp | Geothermal turbine |
| JPS57146001A (en) * | 1981-03-05 | 1982-09-09 | Toshiba Corp | Turbine rotor |
| JPS5974307A (en) * | 1982-10-19 | 1984-04-26 | Toshiba Corp | Shaft sealing device of axial-flow rotary machine |
| JPS5967501U (en) * | 1982-10-28 | 1984-05-08 | 三菱重工業株式会社 | Turbine partition plate sealing device |
| JPS5990001U (en) * | 1982-12-09 | 1984-06-18 | 株式会社東芝 | Rotor erosion prevention device for geothermal turbines |
| JPS6098268A (en) * | 1983-11-04 | 1985-06-01 | Toshiba Corp | Shaft seal for axial-flow rotary machine |
-
1988
- 1988-12-23 JP JP63325165A patent/JP2858697B2/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1220904A (en) * | 1968-10-28 | 1971-01-27 | Westinghouse Electric Corp | Diaphragm seal structure |
| JPS4956009A (en) * | 1972-09-29 | 1974-05-30 | ||
| JPS51116304A (en) * | 1975-04-04 | 1976-10-13 | Hitachi Ltd | Moving root fin |
| JPS5284351A (en) * | 1975-12-30 | 1977-07-13 | Hitachi Ltd | Axial sealer for rotor |
| JPS5540237A (en) * | 1978-09-13 | 1980-03-21 | Toshiba Corp | Geothermal turbine |
| JPS57146001A (en) * | 1981-03-05 | 1982-09-09 | Toshiba Corp | Turbine rotor |
| JPS5974307A (en) * | 1982-10-19 | 1984-04-26 | Toshiba Corp | Shaft sealing device of axial-flow rotary machine |
| JPS5967501U (en) * | 1982-10-28 | 1984-05-08 | 三菱重工業株式会社 | Turbine partition plate sealing device |
| JPS5990001U (en) * | 1982-12-09 | 1984-06-18 | 株式会社東芝 | Rotor erosion prevention device for geothermal turbines |
| JPS6098268A (en) * | 1983-11-04 | 1985-06-01 | Toshiba Corp | Shaft seal for axial-flow rotary machine |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002180802A (en) * | 2000-12-11 | 2002-06-26 | Mitsubishi Heavy Ind Ltd | Stationary blade in steam turbine |
| EP1331362A2 (en) * | 2002-01-28 | 2003-07-30 | Kabushiki Kaisha Toshiba | Geothermal steam turbine |
| EP1331362A3 (en) * | 2002-01-28 | 2003-12-17 | Kabushiki Kaisha Toshiba | Geothermal steam turbine |
| EP1803898A2 (en) * | 2002-01-28 | 2007-07-04 | Kabushiki Kaisha Toshiba | Geothermal turbine |
| EP1803898A3 (en) * | 2002-01-28 | 2012-01-04 | Kabushiki Kaisha Toshiba | Geothermal turbine |
| JP2009216047A (en) * | 2008-03-12 | 2009-09-24 | Fuji Electric Systems Co Ltd | Method of coating turbine |
| JP2013194686A (en) * | 2012-03-22 | 2013-09-30 | Mitsubishi Heavy Ind Ltd | Turbine, and seal member, moving blade, stator blade, rotor and casing thereof |
| US11105213B2 (en) | 2015-12-09 | 2021-08-31 | Mitsubishi Power, Ltd. | Seal fin, seal structure, turbo machine, and method for manufacturing seal fin |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2858697B2 (en) | 1999-02-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5227114B2 (en) | Labyrinth compression seal and turbine incorporating it | |
| JP3477347B2 (en) | Gas turbine interstage seal device | |
| US4589823A (en) | Rotor blade tip | |
| US5290144A (en) | Shroud ring for an axial flow turbine | |
| US5525038A (en) | Rotor airfoils to control tip leakage flows | |
| US6916021B2 (en) | Sealing arrangement | |
| US7967559B2 (en) | Stator-rotor assembly having surface feature for enhanced containment of gas flow and related processes | |
| CA1258081A (en) | Rub tolerant shroud | |
| US4767266A (en) | Sealing ring for an axial compressor | |
| US5238364A (en) | Shroud ring for an axial flow turbine | |
| JPS6123804A (en) | Turbine stage structure | |
| JP2006291967A (en) | Axial flow turbine | |
| EP0774050A1 (en) | Interrupted circumferential groove stator structure | |
| JPH02173302A (en) | Seal-fin mechanism at blade end of geothermal steam turbine static blade | |
| US3756740A (en) | Turbine stage | |
| CN212671868U (en) | Impeller machinery movable vane top seal structure | |
| EP1985805B1 (en) | Rotary machine | |
| JP4051132B2 (en) | Turbine blade | |
| JP2000073702A (en) | Axial flow turbine | |
| JP2019035347A (en) | Turbine component, turbine blade, axial flow turbine and remodeling method thereof, and manufacturing method of turbine blade | |
| JPH1113409A (en) | Blade part sealing structure of steam turbine | |
| JP2005127198A (en) | Turbine and sealing structure of stationary blade root section and moving blade root section | |
| JP2000136766A (en) | Pump turbine runner | |
| JPS58500489A (en) | floating inflation control ring | |
| JP2001234843A (en) | Water turbine moving blade |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20071204 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081204 Year of fee payment: 10 |
|
| LAPS | Cancellation because of no payment of annual fees |