CN1060137A - 燃气轮机间隔盘的隔热装置 - Google Patents
燃气轮机间隔盘的隔热装置 Download PDFInfo
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Abstract
本发明提供围绕转子间隔盘整个圆周的密封弓
形件的可拆卸附件,为此,在每间隔盘的圆周面上设
置的传统环槽,(作为高/低密封表面结构的一部分)
被重新改成燕尾槽,它们是用来安装密封弓形件的互
补或配合部分的。换句话说,每一相邻环槽安装若干
密封弓形件,其总体基本上防止了或至少最大限度地
减少了热燃气直接冲刷在间隔盘的圆周面上。
Description
在现代燃气轮机中,对高效率的高输出功率的要求已导致工作温度的显著升高。这又导致了采用不同材料的复合转子构件的设计与制造。它还导致了研制许多复杂而昂贵的用于将冷却空气输送到燃气轮机各部分,包括暴露于热燃气的那些部分的内部流动回路,以适应在温度提高状态下的运转。
在高效率、高温度燃气轮机运转中的主要问题一直是转子盘及夹于相邻转子盘之间的间隔盘的不均匀受热与冷却。例如,在过渡工况期间,即在起动以及在起动和透平额定转速之间的其它速度变化期间,在包括叶片在内的透平转子盘的外周部分和内周部分之间,存在很大的温差。类似的温度出现在间隔盘的内外部分之间。这些基本上沿径向方向的温度梯度引起的大的热应力,它们本身又能缩短这些部件的使用寿命。具体就间隔盘来说,不能迅速修复间隔盘的传统的高/低密封周边(它通过一种互补的高/低面结构跟相邻静止构件配合)的损坏,导致昂贵的转子扯毁,乃至整个间隙盘的刮伤。
本发明涉及一种隔热装置,它充分防止级间热燃气冲刷在燃气轮机内间隔盘的外周面上,因而产生较低的温度梯度和应力,并藉此延长该盘的工作寿命,并带来如下所述的其它好处。
具体来说,本发明提供了围绕转子间隔盘整个圆周的可拆卸的高温隔离弓形体附件。为此,在各间隔盘圆周面上形成的传统环槽(作为高/低密封面结构的部分)重新形成为燕尾槽,该燕尾槽用来安装各密封弓形体的互补或匹配部分。换句话说,每一相邻的环槽安装若干密封弓形体,其总体基本上防止或至少最大限度地减少热燃气直接冲刷在间隔盘的圆周面上。
按照本发明的另一观点,在间隔盘的圆周上采用分离的密封弓形体还为更先进的高/低密封结构提供了一种结构基础。
同时,损坏间隔盘的可能性本身减至最小,其中当相对于高/低密封结构的静止部件出现任何磨损时,密封弓形体的径向适应性允许它径向收缩。如果弓形体本身出现磨损,就能容易地拆下并更换它们,无需耗费拆卸时间。
因此,在本发明的一个典型实施例中,在燃气轮机每一间隔盘的周围圆周面上设置若干燕尾型槽。每一槽可滑动地安装若干密封弓形体。每一弓形体具有一种基本上和各相关的燕尾槽表面互补的底部结构。具体来说,每一密封弓形体的底部包括一平底面,一对向内和向上斜切的面,它们和弓形体的上部接合,弓形体的上部包括一基本水平部分,它本身构成一环形圆周槽,以保持一种高/低密封面结构,跟相邻静止构件上的互补表面结构配合来构成另外已知的阻止流动路径。
密封弓形体下部或底部跟燕尾槽表面之间的间隙是这样的,在间隔盘转动期间,由于作用于其上的离心力的结果,该密封弓形体会被径向向外推动,结果,各密封弓形体向上且向内斜切的表面便跟各燕尾槽相应的锥面密封啮合。这种密封啮合防止了级间热燃气直接冲刷在间隔盘圆周面上相当大的部分。在这一首先叙述的实施例中,极少量的热燃气最终接触间隔盘其它圆周面部分是可能的,因为相邻槽中间相邻弓形体之间有间隙存在。然而,该密封弓形体对横穿间隔盘沿轴向流动的气体形成了一个很大的热障。
在另一典型实施例中,密封弓形体的上部设有不对称水平延伸的突缘,它们用来跟相邻槽中相邻弓形体上的类似突缘进行密封啮合,因此,形成了一个基本完整的热障,防止了任何级间热燃气直接冲刷在间隔盘的圆周面上。
在又一个结构里,通过把密封弓形体上部的形状做成稍微复杂和不对称分布便获得了一种更为先进的高/低密封面结构,它为横穿间隔盘表面轴向流动的燃气提供了一条相当迂回的路途。
由于提供了如上所述的隔热结构的结果,可以获得下列优点:①形成了有效的传热阻力,以使转子间隔盘在过渡工况期间保持在较低的温度;②由于采用了按最佳密封效果构成的弓形体,可得到更加先进的高/低迷宫密封装置;③受损或磨损的密封装置能在现场更换,减少停机时间;④能把先进的密封结构引入老的工地机组上,以改善性能;⑤间隔盘低的热应力允许和相邻透平转盘一起分担更大级别的负荷。
根据本发明的典型实施例随后的详细叙述,本发明的其它目的会变得明显。
图1是表示通过按本发明制造的燃气轮机的轴的纵剖面的破碎剖视图;
图1A是公知间隙盘的局部横剖面图;
图2是取自图1的放大细部;
图3是图2中所示型式的密封弓形体轴侧图;
图4是图1中所示型式的间隙盘的局部横剖视图,但它具有连接于其上的按照本发明第二示范性实施例的密封弓形体;
图5是按照本发明第三示范性实施例的密封弓形体的轴侧图;
图6是表示装配状况的局部侧视图,其中处于单槽内的密封弓形体相互连接;
图7是图1中所示间隙盘的局部顶部轴侧图。
现在参照各附图,尤其参照图1、1A和2,这些图用横剖面表面了一燃气轮机的转子构件,其构件总的以10表示。该燃气轮机包括通常的压缩机,燃烧器,外壳和其它附属构件,这些对于熟悉本技术的人们是显然的。如在图1中所示,转子构件10包括轴12,轴12具有一前突缘14和一后突缘16,在轴12上,装有若干转子盘,其中表示了三个,包括前盘18,中盘20和后盘22。应该理解本发明对于具有更多转子盘的各种燃气轮机也是有用的。叶片24、26和28分别安装在转子盘18、20和22的外周。间隙盘30和32分别配置在前,中转子盘18与20之间以及中、后转子盘20与22之间。螺栓,其中一个以34表示,穿过在轴12前、后端的突缘14与16,将转子盘和间隔盘相互固定成邻接关系,因此,转子盘与间隔盘围绕转子轴一起转动。应该理解,上述转子构件在本技术领域内是常规的,其上有很多辅助构件,除非熟悉本技术的人们由于操作燃气轮机转子的需要而要知道,在这里不再叙述这些构件。
简要地参照图1A,在过去通常的做法是设置一间隔盘30,围绕其整个圆周表面有若干相邻的环槽36,作为公知的高/低迷宫密封装置的一部分,它用来最大限度地减少沿垂直于槽纵向的方向的轴向气流泄漏。这些槽跟相邻静止部件31上的互补凸台组合在一起,形成了一条阻止由箭头A所示的这一轴向流的迂回通道。本发明相对于传统的密封结构表现出显著的改进,其中不仅保留了传统的高/低密封面形状,而且它本身还构成了间隔盘的隔热装置。
现在再参照图1及图2,按照本发明一个典型实施例的间隔盘30设有一系列燕尾槽38,它围绕该盘的整个圆周延伸。每一横向间隔的燕尾槽38包括一平直底面40,一对向上和向内渐缩的锥面42,它们终止于基本平直的圆周面44。当然,盘32(及任何另外的间隔盘)也包括燕尾槽和密封弓形体结构,但因为就槽/密封装置的外形来说,它们本质是相同的,因此仅盘在这里需要详细叙述。还应理解,提及顶部、底部、水平、垂直等关系涉及到盘30的方位,如在图2中显示的那样,然而在别的方面都不是用来限制的。
用作与其匹配啮合的若干密封弓形体46可滑动地插入每一燕尾槽38内。具体地说,每一弓形体46包括一具有平底面50的底部48,向内且向上渐缩的一对面52以及一上部54,所述上部包括一对朝向外的基本平直面56,基本垂直延伸的二侧壁58和一基本平直的顶面60。在顶面60内制成一圆周槽62,自该弓形体的一端纵向延伸到另一端,以保持传统高/低迷宫密封装置的优点。
制成弓形体46的材料是经过选择的,它在热力、磨损及强度诸性质方面相对于最低成本之间达到最佳平衡。一种目前最佳的材料是具有低导热系数的高温钢,但按照上述规范选定的其它钢可同样有效。
应当理解,安装若干这种弓形体在每一环槽38内,以便沿间隔盘30的整个圆周而延伸。为了在单个槽内的相邻部分之间保持密封关系,提供了如在图3与6中所示的凸台与凸爪结构。这样,在一个弓形体上的凸台64便和在相邻弓形体上的相关凸爪66相啮合,当然,对于所述每一弓形体,这种接合结构围绕相关燕尾槽38的整个圆周是连续的。
现在参照图7,相对于每一燕尾槽38,上平面44可开有对齐的切口68,以便在围绕燕尾槽圆周的至少一处在该槽内形成一扩大的开口,允许所述密封弓形体插入该槽内。
在透平运转期间,由于在弓形体46和槽38之间有予定的间隙,在盘30转动产生的离心力作用下,各弓形体46会被径向向外推入燕尾槽38内。然而,这些弓形体46由于它们在各燕尾槽内的对称分布将会跟透平转子旋转轴保持同心。在这一径向向外负荷状态下,各弓形体46的表面52会相应地跟燕尾槽38的锥面42啮合,从而达到它们之间的密封。弓形体46的径向移动量是很小的,但万一由于,例如,过度的热膨胀跟相邻静止部件(如图1A中的部件31)的磨擦磨损,无论如何足以允许某种程度的恢复原状(通过径向移回)。
虽然上述实施例允许某些少量热燃气在相邻槽38中间的相邻弓形体46之间,即二相邻侧壁58之间穿过,然而可以直接冲刷到盘30的圆周面40、42和44上的热燃气量却大为减少。这就缩少了盘径向内外部分之间的温差,从而降低了热应力,使盘工作寿命延长。同时,应当理解,磨损会发生在弓形体46上而不是在盘30上,这些弓形体经开口68易于更换,因此也导致盘工作寿命延长,并稍微缩短了完成这种更换的时间。
随着盘30的转速下降,所述弓形体回复到燕尾槽38内,这样,该弓形体的表面56将跟盘的平直表面44相啮合。在收缩位置上,在表面40和50之间可以有间隙,也可以没有间隙。这取决于所选定的公差。
现在参照图4,它表示了用于在燕尾槽38内密封啮合的某一密封弓形体的另一典型实施例,该槽大体上和图2实施例中的燕尾槽38相同。图4所示的密封弓形体70各包括平底面72,向上和向内渐缩的密封面75、74、76各自汇合到向外延伸的密封突缘78、80。这些突缘又连接于所述弓形体的上部82。从图4将会理解,突缘78和80相对于所述弓形体的中心线84是偏心定位的。例如突缘78比突缘80处于较高的垂直位置上(当从图4所示的横剖面观察时),并且突缘78自所述弓形体的上部比突缘80延伸较长的距离。借助于这种结构,得到在突缘78跟相对于弓形体70左侧的紧邻弓形体的突缘80之间的叠合密封结构。同样,所述弓形体70的突缘80跟相对于弓形体70右侧的该弓形体突缘78的下侧密封啮合。因此,在间隔盘36转动期间,该密封弓形体的向外负荷不仅形成了一种密封装置,其中锥面74、76啮合燕尾槽锥面42,而且在相邻弓形体的突缘78和80之间也会有密封啮合,从而避免了热燃气直接洗刷在盘30的圆周面上。
现在参照图5,公开了再一个密封弓形体结构,它包括一个改进的迷宫密封装置。由在图6中所公开的弓形体形成的隔热装置和图1和2中所示的基本上相同。然而在图6中,上面或圆周面60设有一邻近于槽86的斜齿状凸台84,在静止部件31上设有一类同的互补件,这样为轴向流动着的气体形成了一条特别迂回的途径。
虽然已经叙述了本发明连同目前认为是最实用和最佳的实施例,然而应该理解,本发明并不限于所述公开的实施例,恰恰相反,而要覆盖包含在附加的权利要求书的精神与范围内的各种变型和等同结构。
Claims (20)
1、在一种安排于燃气轮机中的一对转子盘中间并用于跟其一起转动的环形间隔盘中,该间隔盘具有一外圆周面,其改进包括:在所述圆周面上制成若干侧向对齐的环形槽,可拆卸地固定在每一所述环形槽内的若干密封件,所述密封件由于防止了热燃气直接冲刷在所述圆周面的至少相当部分而形成了一个隔热装置。
2、按权利要求1所述的间隔盘,其特征在于每一所述密封件包括若干相互连接的弓形件。
3、按权利要求1所述的间隔盘,其特征在于所述槽加工成燕尾槽,每一槽包括一个基本平底面,二锥形侧面和基本平直的顶面,所述顶面在所述二槽的二相邻面之间延伸。
4、按权利要求3所述的间隔盘,其特征在于每一所述密封件具有一底部,底部包括一基本平底面和工锥形侧面,适于跟所述槽中的一条相关槽的所述基本平底面及二锥形侧面较松配合啮合,因此,所述密封件在第一和第二位置之间径向移动。
5、按权利要求3所述的间隔盘,其特征在于每一所述燕尾槽设有一个便于所述密封件插入的扩大开口。
6、按权利要求4所述的间隔盘,其特征在于每一所述密封件包括一个相对于所述密封件底部及中心线对称配置的上部。
7、按权利要求4所述的间隔盘,其特征在于每一所述密封件包括一个相对于所述密封件底部及中心线不对称配置的上部。
8、一种用于燃气轮机中的间隔盘,包括:
一个具有基本平行于所述盘旋转轴的环形圆周面的盘体;
若干在所述圆周面上形成的并沿其圆周延伸的基本平行槽;
若干可拆卸地固定在每一所述槽内的密封弓形体,因此,基本上所有的所述圆周面被所述若干可活动的密封弓形体所覆盖。
9、按权利要求8所述的间隔盘,其特征在于所述密封弓形体各有一底部和一上部,所述上部有一高/低外表面形状。
10、按权利要求9所述的间隔盘,其特征在于每一所述底部具有一种基本上跟所述槽的横断面形状互补的形状。
11、按权利要求10所述的间隔盘,其特征在于所述槽具有一种大致燕尾形状。
12、按权利要求11所述的间隔盘,其特征在于所述密封弓形体在径向收缩位置和径向延伸位置之间可以移动。
13、按权利要求9所述的间隔盘,其特征在于每一所述上部包括一对在水平方位上的密封表面和一条在所述上部内对中的圆周槽。
14、按权利要求9所述的间隔盘,其特征在于每一所述上部包括一个带角度的环形凸台和一条偏心的环槽。
15、按权利要求9所述的间隔盘,其特征在于每一所述上部包括一对配置在不同高度上的侧向延伸的密封表面,这样,在相邻槽中的相邻密封弓形件相互叠合。
16、按权利要求15所述的间隔盘,其特征在于每一所述上部包括一个不对称于所述弓形体中心线的凸台。
17、一种用于安装在燃气轮机相邻转子盘之间的间隔盘,所述间隔盘具有一个其上设置若干相邻环槽的环形圆周面,每一所述环槽设有可拆卸和可更换的装置,这一装置用于对热燃气在所述圆周面上的直接冲刷构成热障,并用于阻止燃气沿所述圆周面轴向流动。
18、按权利要求17所述的间隔盘,其特征在于所述装置可滑动地安装在所述槽内。
19、按权利要求18所述的间隔盘,其特征在于所述装置包括位于所述槽之间配置成叠合关系的一些表面。
20、按权利要求18所述的间隔盘,其特征在于所述装置包括在所述槽之间,配置成面对面关系的一些表面。
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US (1) | US5080556A (zh) |
EP (1) | EP0482758A1 (zh) |
JP (1) | JPH04255533A (zh) |
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GB192514A (en) * | 1921-11-10 | 1923-02-08 | Erste Bruenner Maschinen Fab | Improvements in labyrinth packings for the rotating shafts of steam turbines, gas turbines, fans, blowers, pumps and fluid-pressure machines in general |
DE2620762C2 (de) * | 1976-05-11 | 1977-11-17 | Motoren- und Turbinen-Union München GmbH, 8000 München | Spaltdichtung für Strömungsmaschinen, insbesondere Gasturbinenstrahltriebwerke |
SU601435A1 (ru) * | 1976-12-08 | 1978-04-05 | Московский Ордена Ленина Энергетический Институт | Уплотнение ротора турбомашины |
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JPS57168005A (en) * | 1981-04-10 | 1982-10-16 | Hitachi Ltd | Rotor structue for axial machines |
US4420161A (en) * | 1982-05-10 | 1983-12-13 | General Electric Company | Rotor stabilizing labyrinth seals for steam turbines |
JPS5918209A (ja) * | 1982-07-21 | 1984-01-30 | Toshiba Corp | 冷熱ガスタ−ビン用ラビリンスパツキン |
JPS5970815A (ja) * | 1982-10-15 | 1984-04-21 | Toshiba Corp | 蒸気タ−ビンのグランドラビリンスシ−ル装置 |
US4979755A (en) * | 1988-02-18 | 1990-12-25 | Westinghouse Electric Corp. | Flow dams in labyrinth seals to improve rotor stability |
US5002288A (en) * | 1988-10-13 | 1991-03-26 | General Electric Company | Positive variable clearance labyrinth seal |
-
1990
- 1990-09-28 US US07/589,501 patent/US5080556A/en not_active Expired - Fee Related
-
1991
- 1991-09-18 JP JP3265472A patent/JPH04255533A/ja not_active Withdrawn
- 1991-09-20 EP EP91308584A patent/EP0482758A1/en not_active Withdrawn
- 1991-09-25 CN CN91109190A patent/CN1060137A/zh active Pending
- 1991-09-26 KR KR1019910016750A patent/KR920006620A/ko not_active Application Discontinuation
- 1991-09-27 NO NO913808A patent/NO913808D0/no unknown
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102661972A (zh) * | 2012-05-16 | 2012-09-12 | 北京黎明航发动力科技有限公司沈阳黎明燃机分公司 | 燃气轮机隔热罩及其隔热性能的测定方法 |
CN102661972B (zh) * | 2012-05-16 | 2015-02-11 | 北京黎明航发动力科技有限公司沈阳黎明燃机分公司 | 燃气轮机隔热罩隔热性能的测定方法 |
CN105863742A (zh) * | 2014-12-31 | 2016-08-17 | 通用电气公司 | 燃气涡轮中的流路边界和转子组件 |
CN106401656A (zh) * | 2015-07-29 | 2017-02-15 | 通用电气公司 | 用于涡轮机的近流动路径密封件 |
CN107489460A (zh) * | 2016-06-10 | 2017-12-19 | 通用电气公司 | 涡轮盘组件及其制造方法 |
CN109844264A (zh) * | 2016-10-07 | 2019-06-04 | 赛峰飞机发动机公司 | 用于涡轮发动机涡轮的能动环组件 |
CN109667627A (zh) * | 2017-10-13 | 2019-04-23 | 斗山重工业建设有限公司 | 燃气轮机的转子轮盘总成 |
CN109667627B (zh) * | 2017-10-13 | 2022-01-25 | 斗山重工业建设有限公司 | 燃气轮机的转子轮盘总成 |
Also Published As
Publication number | Publication date |
---|---|
JPH04255533A (ja) | 1992-09-10 |
NO913808D0 (no) | 1991-09-27 |
EP0482758A1 (en) | 1992-04-29 |
US5080556A (en) | 1992-01-14 |
KR920006620A (ko) | 1992-04-27 |
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