JP3636336B2

JP3636336B2 - Axial exhaust turbine

Info

Publication number: JP3636336B2
Application number: JP15614796A
Authority: JP
Inventors: 秀雄加藤
Original assignee: Fuji Electric Systems Co Ltd
Current assignee: Fuji Electric Co Ltd
Priority date: 1996-05-28
Filing date: 1996-05-28
Publication date: 2005-04-06
Anticipated expiration: 2016-05-28
Also published as: JPH09317406A

Description

【０００１】
【発明の属する技術分野】
この発明は、タービン車軸の軸方向に位置する復水器へ蒸気を排気する軸流排気タービンに関し、特にタービン車軸の軸受等の保守・点検が容易な構造からなる軸流排気タービンの構成に関する。
【０００２】
【従来の技術】
図５〜図７は、従来の軸流排気タービンの構造を示すものであり、図５は軸流排気タービンの部分断面図、図６は図５のVI−VI断面図、図７は図６のVII−VII断面図である。
ところで、通常は復水タービン（蒸気タービン）は、タービン内で仕事をした蒸気は、タービンの低圧部から排気となって復水器に導かれる。この復水器に導かれる排気蒸気は、蒸気タービンの低圧部の低圧ケーシングに連結する排気ケーシングを介して行われる。
【０００３】
この蒸気タービンにはタービン車軸方向の上及び下方向に復水器が設置された構造で蒸気が前記したタービン車軸の軸方向とは直角に曲げられ排気する上向き排気タービン及び下向き排気タービンと、復水器を蒸気タービン床面とほぼ同じ高さに設置して、蒸気の流れの方向がタービン車軸方向で排気ケーシング内で変化しない軸流排気タービンとに分けられる。
上記の軸流タービンは、復水器が蒸気タービン床面に位置しているので、タービンの高さ寸法の低減ができるという特徴を有している。
【０００４】
この軸流排気タービンの構造は、図５〜図７に示すように、蒸気タービンの低圧翼１を収納している低圧部の低圧ケーシング２に連結してタービン車軸３の軸方向に設置されている排気ケーシング４内の中央部に前記タービン車軸３の軸端部を保持する軸受５が設けられており、この軸受５を収納する軸受台６の外周部と前記排気ケーシング４の内壁部との間に図６に示すように周方向に放射状に間隔をおいて６本の支柱７が連結されて前記軸受台６を均等に支持するタービン車軸支持装置（例えば特開平4-269304号公報参照）を構成しており、また、タービン車軸支持装置を収納している排気ケーシング４内を通過した排気蒸気８を、復水器へ導入する排気ダクト９が前記排気ケーシング４と前記復水器間に連結して設けられている。
【０００５】
前記したように、軸流排気タービンの軸受５は排気ケーシング４内の排気蒸気８の雰囲気中に設置されているので、軸受５内に封入されている潤滑油に前記蒸気８が侵入しないように低圧ケーシグ２側の軸受５の端部にラビリンス形のパッキングからなる軸封装置１０が連結された気密構造となっている。そして、前記軸受５に潤滑油を給油，排油する油配管１１（図５には一本の給油の油配管が図示されている）と前記軸封装置１０に給気，排気する蒸気配管１２（図５には一本の給気の蒸気配管が図示されている）からなる配管部１３が前記排気ケーシグ４壁を貫通して外部に設けられた潤滑油系統と蒸気系統とに接続されている。
また、前記した構成からなる軸流排気タービンにおいて、軸受台６，軸封装置１０，及び前記軸受台６を支持する支柱７と前記配管部１３とを一体にして覆うタービン車軸３の軸方向に延びる円筒状のカバー１４と、前記支柱７とこの支柱７に沿って配された油配管１１又は蒸気配管１２のいずれかの一本の配管部１３を収納した図７に示すタービン車軸３の軸方向の外形が円弧状の流れガイド１５とをそれぞれ設けて、排気ケーシング４内から復水器へ排気される蒸気８の流通抵抗を少なくするようにしている。
【０００６】
【発明が解決しようとする課題】
ところで、前記した従来のタービン車軸支持装置を備えた軸流排気タービンにおいて、排気ケーシング４内に設置されている軸受５を定期的に、また不具合が発生した場合に随時その保守・点検行う。
この軸受の保守・点検時における前記軸受５及び軸受台６の分解作業を、図５に示す排気ダクト９側から、軸受台６をタービン車軸３方向にカバー１４と流れガイド１５とともに取り出して行う場合には、前記のカバー１４と流れガイド１５との内部に収納している軸受台６に連結された支柱７と、軸受５及び軸封装置１０にそれぞれ連結されている配管部１３とを取り外さねばならず、その分解作業及び点検後の組立作業が複雑で長時間を要するという問題があった。
【０００７】
また、タービン車軸支持装置を収納している排気ケーシング４を上部側及び下部側と２つ割り構造として、前記上部側の排気ケーシング４を取り外して作業を行う場合においても、上部側の排気ケーシング４に配されている支柱７と油配管１１とを軸受台６とから、また上部側の排気ケーシング４に連結されている蒸気配管１２をそれぞれ取り外す必要があり、前記と同様にタービン車軸支持装置の分解及び組立作業が煩雑になるという問題がある。
【０００８】
この発明の課題は、従来の前記したような軸流排気タービンの構成での軸受の保守・点検時に、軸受台を支持する支柱，配管部の取外し作業を必要としない構造からなる保守・点検作業が容易な軸流排気タービンの構造を提供することにある。
【０００９】
【課題を解決するための手段】
上記した課題を解決するために、この発明は、タービン車軸の軸方向に位置する復水器へ蒸気を排気する軸流排気タービンの排気ケーシング内の中央部に位置して前記タービン車軸を保持する軸受を収納する軸受台と、この軸受台を前記排気ケーシングの中央部に位置決め支持する支柱とからなるタービン車軸支持装置と、前記軸受内への排気ケーシング内の蒸気の侵入を防止する軸封装置とを備えた軸流排気タービンにおいて、前記排気ケーシングと、この排気ケーシグ内に位置する前記軸受台とをそれぞれ上部側と下部側の２つ割り構造とし、この軸受台の下部側と、軸受に潤滑油を給，排油する油配管並びに前記排気ケーシング内の軸封装置に蒸気を給，排気する蒸気配管とを前記排気ケーシングと復水器とを連結する排気ダクト内にそれぞれ延長して設け、前記軸受台を支持する支柱を前記排気ダクト内壁部と、この排気ダクト内に位置する前記軸受台の下部側との間に周方向に間隔をもって複数個設けるものとする（請求項１）。これにより、支柱と配管部を軸受台及び軸封装置から取り外すことなく、前記した上部側の排気ケーシクと２つ割り構造の上部側の軸受台部を取り外すことにより軸受の点検をすることができる。
【００１０】
請求項１の発明において、前記排気ダクト内に延長して設けた前記軸受台の下部側の端部形状を円弧状とするとよい（請求項２）。
【００１１】
また、この発明は、タービン車軸の軸方向に位置する復水器へ蒸気を排気する軸流排気タービンの排気ケーシング内の中央部に位置して前記タービン車軸を保持する軸受を収納する軸受台と、この軸受台を前記排気ケーシングの中央部に位置決め支持する支柱とからなるタービン車軸支持装置と、前記軸受の潤滑油への排気ケーシング内の蒸気の侵入を防止する軸封装置とを備えた軸流排気タービンにおいて、前記排気ケーシングと、この排気ケーシグ内に位置する軸受台とをそれぞれ上部側と下部側の２つ割り構造とし、この軸受台の下部側に連結した軸受台支持部と、軸受に潤滑油を給，排油する油配管並びに排気ケーシング内の軸封装置に蒸気を給，排気する蒸気配管とを前記排気ケーシングと復水器とを連結する排気ダクト内にそれぞれ延長して設け、前記軸受台を支持する支柱を前記排気ダクト内壁部と、この排気ダクト内に位置する前記軸受台支持部との間に周方向に間隔をもって複数個設けるものとする（請求項３）。これにより、軸受台を支持する支柱及び配管部が排気ダクト内に位置するので、前記の２つ割りの排気ケーシグを取り外すことにより容易に軸受の点検ができる。
【００１２】
請求項３の発明において、前記排気ダクト内の軸受台支持部と油配管並びに蒸気配管とを円弧状のカバーで覆うとよい（請求項４）。
【００１３】
【発明の実施の形態】
以下この発明の実施の形態を図１〜図４に基づいて説明する。
実施の形態１
図１及び図２は、この発明の第１の実施の形態のそれぞれ異なる実施例からなる軸流排気タービンの部分断面図である。
この第１の実施の形態は、図１及び図２に示すように、タービン車軸３を排気ケーシング４の中央部にて保持する軸受５を収納する軸受台６を上部側６ｃと下部側６ｄの２つ割り構造とするとともに、軸受台６の下部側６ｄを復水器側の排気ケーシング４に連結された排気ダクト９内まで延長して配置し、この下部側６ｄの排気ダクト９内に位置する部分と排気ダクト９の内壁面との間に周方向に、従来と同様に流れガイド１５内に１本の配管部１３が併置して収納された支柱７を６本放射状に固着して連結支持するものである。
【００１４】
このような構成とすることにより、排気ケーシグ４と、この排気ケーシグ４内に位置するカバー１４及び軸受台６を上下２分割構造とすれば、排気ダクト９内に位置する支柱７及び配管部１３を取り外すことなく、軸受５の点検時に、排気ケーシング４側で前記したそれぞれの上部側の各構成部分を取り外すことにより容易に点検作業を行うことができる。
なお、前記した軸受台６の排気ケーシング４内の上部側軸受台６ｃは、軸受台６の上部側排気ケーシング４ａ側内に位置する部分を下部側軸受台６ｄから上下に２分割したものであり、分割された他方の下部側軸受台６ｄの部分との間の分割面の長手方向に延びて設けられた前記したフランジ６０，６０間で互いに結合するように構成されており、また、排気ケーシング４とカバー１４もフランジ４０と１４０とで２分割された構成部分で結合されている。
【００１５】
図１と図２との実施例の違いは、図１に示す支柱７等を固着する排気ダクト９内に延長して設けられた軸受台６の端部が角状を呈した軸受台部６ｄからなる構成では、排気蒸気８が排気ダクト９内に流通して前記軸受台部６ｄの外壁面に沿って復水器側に流れる場合に、前記軸受台部６ｄの軸端面で渦流を発生して排気蒸気８の流通抵抗が増大する恐れがあるために、その流通抵抗を減少するように、図２の実施例ではタービン車軸方向に伸びる軸受台下部側６ｄの端部形状を円弧状として排気蒸気８の流れに渦流が発生するのを防止したことにある。
【００１６】
実施の形態２
図３及び図４は、この発明の第２の実施の形態からなるそれぞれ異なる実施例からなる軸流排気タービンの部分断面図である。
この実施の形態２と前記の実施の形態１との違いは、排気ダクト９内に延長して設けられた軸受台６の下部側６ｄに替えて、軸受台６に連結された軸受支持台部１６を排気ダクト９内まで延長して配置した点にある。
【００１７】
前記した軸受台支持部１６は、上下に２分割された軸受台６の下部側６ｂと一体に連結されて構成されており、軸受台６の上部側６ａとはフランジ６０，６０間で結合するように構成されている。そして、軸受５及び軸封装置１０に連結されている油配管１１及び蒸気配管１２の配管部１３は、それぞれ前記軸受支持部１６に一方端を従来の図６に示すように放射状に６個固着されて配された流れガイド１５内に収納された支柱７とともに一本ずつ配されている。
【００１８】
図４に示す実施例は、前記実施の形態１の図２に示す構成と同様に、排気ダクト９に排気される蒸気８の軸受台支持部１６における流通抵抗を軽減するために、排気ダクト９内の前記軸受台支持部１６と配管部１３とをカバー１４に連結する円弧状のカバー１４ｃで覆った構成としている。
この実施の形態２の軸流排気タービンにおいても、前記実施の形態１と同様の作業手順で軸受５の点検を行うことができる。
【００１９】
【発明の効果】
以上のように、この発明は、軸受台を支持する支柱を、排気ケーシングと連結された排気ダクト側に延長して設けられた軸受台の下部側又は軸受支持部の周上に固定する構成することにより、軸流排気タービンの排気ケーシグ内の軸受等の点検作業時に前記した支柱と配管類とを軸受台及び排気ケーシング壁から取り外すことなく、分割した上部側の各構成部分を取り外して行うことができるので、点検作業を大幅に省力化することができる。
【００２０】
また前記の排気ダクト内に位置する軸受台の下部側又は軸受支持部の形状を円弧状にし、又は円弧状のカバーで覆う構造とすることにより、復水器へ排気される蒸気の流通抵抗を減じて軸流排気タービンの運転効率を改善することができる。
【図面の簡単な説明】
【図１】この発明の第１の実施の形態からなる軸流排気タービンの部分断面図である。
【図２】この発明の第１の実施の形態からなる図１とは異なる実施例からなる軸流排気タービンの部分断面図である。
【図３】この発明の第２の実施の形態からなる軸流排気タービンの部分断面図である。
【図４】この発明の第２の実施の形態からなる図３とは異なる実施例からなる軸流排気タービンの部分断面図である。
【図５】従来の軸流排気タービンの部分断面図である。
【図６】図５のVI−VI断面図である。
【図７】図６のVII−VII断面図である。
【符号の説明】
４排気ケーシング
４ａ上部側排気ケーシング
４ｂ下部側排気ケーシング
５軸受
６軸受台
６ａ軸受台上部側
６ｂ軸受台下部側
６ｃ軸受台上部側
６ｄ軸受台下部側
７支柱
７ａ支柱
７ｂ支柱
７ｃ支柱
７ｄ支柱
９排気ダクト
１４カバー
１４ａ上部側カバー
１４ｂ下部側カバー
１４ｃカバー
１５流れカバー
１６軸受台支持部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an axial exhaust turbine that exhausts steam to a condenser located in the axial direction of a turbine axle, and more particularly, to an axial exhaust turbine having a structure that allows easy maintenance and inspection of a turbine axle bearing and the like.
[0002]
[Prior art]
5 to 7 show the structure of a conventional axial exhaust turbine. FIG. 5 is a partial sectional view of the axial exhaust turbine, FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5, and FIG. It is VII-VII sectional drawing.
By the way, normally, in a condensing turbine (steam turbine), steam that has worked in the turbine is exhausted from a low-pressure portion of the turbine and led to a condenser. Exhaust steam guided to the condenser is performed through an exhaust casing connected to a low pressure casing of a low pressure portion of the steam turbine.
[0003]
This steam turbine has a structure in which condensers are installed in the upper and lower directions in the turbine axle direction, and an upward exhaust turbine and a downward exhaust turbine in which steam is bent and exhausted at right angles to the axial direction of the turbine axle described above, The water vessel is installed at almost the same height as the floor of the steam turbine, and the steam flow direction is divided into an axial exhaust turbine in which the direction of steam flow does not change in the exhaust casing in the turbine axle direction.
The axial flow turbine has a feature that the height of the turbine can be reduced because the condenser is located on the steam turbine floor.
[0004]
As shown in FIGS. 5 to 7, the structure of this axial exhaust turbine is installed in the axial direction of the turbine axle 3 by connecting to the low-pressure casing 2 of the low-pressure part that houses the low-pressure blades 1 of the steam turbine. A bearing 5 that holds the shaft end of the turbine axle 3 is provided at the center of the exhaust casing 4 that is located between the outer periphery of the bearing stand 6 that houses the bearing 5 and the inner wall of the exhaust casing 4. As shown in FIG. 6, a turbine axle support device for supporting the bearing base 6 evenly by connecting six struts 7 at radial intervals in the circumferential direction (see, for example, Japanese Patent Laid-Open No. 4-269304). The exhaust duct 9 for introducing the exhaust steam 8 that has passed through the exhaust casing 4 housing the turbine axle support device into the condenser is provided between the exhaust casing 4 and the condenser. It is connected and provided.
[0005]
As described above, since the bearing 5 of the axial exhaust turbine is installed in the atmosphere of the exhaust steam 8 in the exhaust casing 4, the steam 8 does not enter the lubricating oil sealed in the bearing 5. It has an airtight structure in which a shaft seal device 10 made of a labyrinth type packing is connected to the end of the bearing 5 on the low pressure casing 2 side. An oil pipe 11 for supplying and discharging lubricating oil to the bearing 5 (a single oil pipe for oil supply is shown in FIG. 5) and a steam pipe 12 for supplying and exhausting air to the shaft seal device 10. A pipe section 13 (shown in FIG. 5 is a single supply steam pipe) is connected to a lubricating oil system and a steam system provided outside through the wall of the exhaust casing 4. Yes.
Further, in the axial exhaust turbine having the above-described configuration, in the axial direction of the turbine axle 3 that integrally covers the bearing base 6, the shaft seal device 10, and the column 7 that supports the bearing base 6 and the pipe portion 13. A shaft of the turbine axle 3 shown in FIG. 7 that houses a cylindrical cover 14 that extends, and a single pipe portion 13 of the oil pipe 11 or the steam pipe 12 arranged along the pillar 7 and the pillar 7. A flow guide 15 having an arcuate outer shape is provided to reduce the flow resistance of the steam 8 exhausted from the exhaust casing 4 to the condenser.
[0006]
[Problems to be solved by the invention]
By the way, in the axial exhaust turbine provided with the above-described conventional turbine axle support device, the bearing 5 installed in the exhaust casing 4 is regularly maintained and inspected whenever trouble occurs.
When the bearing 5 and the bearing stand 6 are disassembled during maintenance and inspection of the bearing, the bearing stand 6 is taken out together with the cover 14 and the flow guide 15 from the exhaust duct 9 side shown in FIG. In this case, the column 7 connected to the bearing stand 6 housed in the cover 14 and the flow guide 15 and the pipe parts 13 respectively connected to the bearing 5 and the shaft seal device 10 must be removed. However, the disassembly work and the assembly work after the inspection are complicated and require a long time.
[0007]
Even when the exhaust casing 4 housing the turbine axle support device is divided into an upper part and a lower part and the upper exhaust casing 4 is removed, the upper exhaust casing 4 is also operated. It is necessary to remove the column 7 and the oil pipe 11 arranged on the bearing base 6 from the bearing stand 6 and the steam pipe 12 connected to the exhaust casing 4 on the upper side, respectively. There is a problem that the disassembly and assembly work becomes complicated.
[0008]
An object of the present invention is to provide a maintenance / inspection work having a structure that does not require the work of removing the supporting column and the piping part for supporting the bearing stand at the time of maintenance / inspection of the bearing in the configuration of the conventional axial exhaust turbine as described above. It is an object of the present invention to provide a structure of an axial exhaust turbine that is easy to achieve.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention holds the turbine axle at a central portion in an exhaust casing of an axial exhaust turbine that exhausts steam to a condenser located in the axial direction of the turbine axle. Turbine axle support device comprising a bearing stand for housing a bearing, and a support column for positioning and supporting the bearing stand at the central portion of the exhaust casing, and a shaft seal device for preventing steam from entering the exhaust casing into the bearing The exhaust casing and the bearing base located in the exhaust casing are each divided into an upper side and a lower side, and the lower side of the bearing base and the bearing An oil pipe for supplying and exhausting lubricating oil and a steam pipe for supplying and exhausting steam to the shaft seal device in the exhaust casing are disposed in an exhaust duct connecting the exhaust casing and the condenser. A plurality of supporting pillars that support the bearing stand are provided between the inner wall portion of the exhaust duct and a lower side of the bearing stand located in the exhaust duct with a plurality of circumferentially spaced supports; (Claim 1). Accordingly, the bearing can be inspected by removing the upper exhaust casing and the upper bearing base portion of the split structure without removing the column and the piping portion from the bearing base and the shaft seal device. .
[0010]
In the first aspect of the present invention, it is preferable that an end portion of the lower side of the bearing stand provided in the exhaust duct is formed in an arc shape (second aspect) .
[0011]
In addition, the present invention provides a bearing stand that houses a bearing that holds the turbine axle and is located in the center of the exhaust casing of an axial exhaust turbine that exhausts steam to a condenser located in the axial direction of the turbine axle. A shaft provided with a turbine axle support device comprising a column for positioning and supporting the bearing stand at the central portion of the exhaust casing, and a shaft seal device for preventing vapor in the exhaust casing from entering the lubricating oil of the bearing In a flow exhaust turbine, the exhaust casing and a bearing base located in the exhaust casing are each divided into an upper part and a lower part, and a bearing base support part connected to the lower side of the bearing base, and a bearing The oil pipe for supplying and discharging lubricating oil and the steam pipe for supplying and exhausting steam to the shaft seal device in the exhaust casing are connected to the exhaust duct connecting the exhaust casing and the condenser. A plurality of support columns that support the bearing stand are provided between the inner wall portion of the exhaust duct and the bearing stand support portion located in the exhaust duct with a circumferential interval. Item 3). Thereby, since the support | pillar and piping part which support a bearing stand are located in an exhaust duct, a bearing can be inspected easily by removing the said 2 split exhaust casing.
[0012]
In a third aspect of the present invention, the bearing base support portion, the oil pipe, and the steam pipe in the exhaust duct may be covered with an arc-shaped cover (claim 4) .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
Embodiment 1
1 and 2 are partial cross-sectional views of an axial exhaust turbine according to different examples of the first embodiment of the present invention.
In the first embodiment, as shown in FIGS. 1 and 2, a bearing stand 6 that houses a bearing 5 that holds a turbine axle 3 at the center of an exhaust casing 4 is provided on an upper side 6c and a lower side 6d. In addition to the split structure, the lower side 6d of the bearing base 6 is extended to the exhaust duct 9 connected to the exhaust casing 4 on the condenser side, and is positioned in the exhaust duct 9 on the lower side 6d. 6 struts 7 in which one pipe 13 is housed in the flow guide 15 in the circumferential direction between the portion to be exhausted and the inner wall surface of the exhaust duct 9 are fixed and connected in the radial direction. It is something to support.
[0014]
By adopting such a configuration, if the exhaust casing 4 and the cover 14 and the bearing base 6 positioned in the exhaust casing 4 have a vertically divided structure, the column 7 and the piping section 13 positioned in the exhaust duct 9 are provided. The inspection work can be easily performed by removing the respective components on the upper side on the exhaust casing 4 side during the inspection of the bearing 5 without removing the bearing 5.
The upper bearing stand 6c in the exhaust casing 4 of the bearing stand 6 is obtained by dividing the portion of the bearing stand 6 located on the upper exhaust casing 4a side into two vertically from the lower bearing stand 6d. The flanges 60, 60 provided so as to extend in the longitudinal direction of the divided surface between the other divided lower-side bearing base 6d are coupled to each other, and the exhaust casing 4 and the cover 14 are also connected by the components divided into two by the flanges 40 and 140.
[0015]
The difference between the embodiment of FIG. 1 and FIG. 2 is that the end of the bearing base 6 provided in the exhaust duct 9 for fixing the support column 7 and the like shown in FIG. When the exhaust steam 8 flows in the exhaust duct 9 and flows to the condenser side along the outer wall surface of the bearing base 6d, a vortex is generated on the shaft end surface of the bearing base 6d. 2, the flow resistance of the exhaust steam 8 may increase. Therefore, in order to reduce the flow resistance, in the embodiment of FIG. 2, the end portion of the bearing base lower side 6 d extending in the turbine axle direction is formed in an arc shape. This is because the generation of the vortex in the flow of the steam 8 is prevented.
[0016]
Embodiment 2
FIGS. 3 and 4 are partial cross-sectional views of axial exhaust turbines according to different examples of the second embodiment of the present invention.
The difference between the second embodiment and the first embodiment is that a bearing support base portion connected to the bearing base 6 is used instead of the lower side 6d of the bearing base 6 provided to extend in the exhaust duct 9. 16 is extended to the inside of the exhaust duct 9.
[0017]
The above-described bearing base support 16 is integrally connected to the lower side 6b of the bearing base 6 which is divided into two parts in the vertical direction, and is coupled between the flanges 60 and 60 with the upper side 6a of the bearing base 6. It is configured as follows. Then, six pipe parts 13 of the oil pipe 11 and the steam pipe 12 connected to the bearing 5 and the shaft seal device 10 are fixed to the bearing support part 16 in a radial manner as shown in FIG. These are arranged one by one together with the struts 7 accommodated in the flow guides 15 arranged.
[0018]
The example shown in FIG. 4 is similar to the configuration shown in FIG. 2 of the first embodiment in order to reduce the flow resistance of the steam 8 exhausted to the exhaust duct 9 in the bearing stand support portion 16. It is set as the structure which covered the said bearing stand support part 16 and the piping part 13 in the circular arc-shaped cover 14c connected with the cover 14 inside.
Also in the axial exhaust turbine of the second embodiment, the bearing 5 can be inspected by the same operation procedure as that of the first embodiment.
[0019]
【The invention's effect】
As described above, the present invention is configured to fix the column supporting the bearing base on the lower side of the bearing base provided on the exhaust duct side connected to the exhaust casing or on the periphery of the bearing support portion. By removing the components on the divided upper side without detaching the above-mentioned columns and piping from the bearing stand and the exhaust casing wall during the inspection work of the bearings in the exhaust casing of the axial exhaust turbine. Therefore, the inspection work can be saved greatly.
[0020]
In addition, the flow resistance of the steam exhausted to the condenser is reduced by making the shape of the lower part of the bearing stand or the bearing support part located in the exhaust duct into an arc shape or covering it with an arc-shaped cover. This can reduce the operating efficiency of the axial exhaust turbine.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of an axial exhaust turbine according to a first embodiment of the present invention.
FIG. 2 is a partial cross-sectional view of an axial exhaust turbine including an example different from FIG. 1 according to the first embodiment of the present invention.
FIG. 3 is a partial sectional view of an axial exhaust turbine according to a second embodiment of the present invention.
FIG. 4 is a partial cross-sectional view of an axial exhaust turbine according to an embodiment different from FIG. 3 according to the second embodiment of the present invention.
FIG. 5 is a partial cross-sectional view of a conventional axial exhaust turbine.
6 is a sectional view taken along line VI-VI in FIG.
7 is a cross-sectional view taken along the line VII-VII in FIG.
[Explanation of symbols]
4 Exhaust casing 4a Upper side exhaust casing 4b Lower side exhaust casing 5 Bearing 6 Bearing base 6a Bearing base upper side 6b Bearing base lower side 6c Bearing base upper side 6d Bearing base lower side 7 Post 7a Post 7b Post 7c Post 7d Post 9 Exhaust Duct 14 Cover 14a Upper side cover 14b Lower side cover 14c Cover 15 Flow cover 16 Bearing stand support part

Claims

A bearing base that houses a bearing that holds the turbine axle and is located in the center of the exhaust casing of an axial exhaust turbine that exhausts steam to a condenser located in the axial direction of the turbine axle, and In an axial exhaust turbine comprising a turbine axle support device including a support column that is positioned and supported at a central portion of an exhaust casing, and a shaft seal device that prevents intrusion of steam in the exhaust casing into the bearing.
The exhaust casing and the bearing base located in the exhaust casing have a split structure of an upper side and a lower side, respectively, and an oil pipe for supplying and discharging lubricating oil to the lower side of the bearing base and the bearing And a steam pipe for supplying and exhausting steam to the shaft seal device in the exhaust casing is provided in the exhaust duct connecting the exhaust casing and the condenser, respectively, and a column supporting the bearing base is provided. An axial exhaust turbine comprising a plurality of circumferentially spaced spaces between an inner wall portion of the exhaust duct and a lower side of the bearing stand located in the exhaust duct.

2. The axial exhaust turbine according to claim 1 , wherein an end portion of the lower side of the bearing base provided in the exhaust duct is formed in an arc shape.

A bearing base that houses a bearing that holds the turbine axle and is located in the center of the exhaust casing of an axial exhaust turbine that exhausts steam to a condenser located in the axial direction of the turbine axle, and In an axial exhaust turbine comprising a turbine axle support device including a support column positioned and supported at a central portion of an exhaust casing, and a shaft seal device for preventing vapor in the exhaust casing from entering the lubricating oil of the bearing,
The exhaust casing and the bearing base located in the exhaust casing are each divided into an upper part and a lower part, and a bearing base supporting part connected to the lower side of the bearing base, and lubricating oil is supplied to the bearing. , An oil pipe for draining oil and a steam pipe for supplying and exhausting steam to the shaft seal device in the exhaust casing are provided to extend in the exhaust duct connecting the exhaust casing and the condenser, respectively, An axial exhaust turbine characterized in that a plurality of supporting columns are provided at intervals in the circumferential direction between an inner wall portion of the exhaust duct and the bearing stand support portion located in the exhaust duct.

4. The axial exhaust turbine according to claim 3 , wherein the bearing base support, the oil pipe, and the steam pipe in the exhaust duct are covered with an arc-shaped cover.