CN101663465B - 用于制造带有涂层的透平动叶片的方法 - Google Patents
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- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
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- 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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
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- F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49316—Impeller making
- Y10T29/49336—Blade making
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49316—Impeller making
- Y10T29/49336—Blade making
- Y10T29/49339—Hollow blade
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49718—Repairing
- Y10T29/49721—Repairing with disassembling
- Y10T29/49723—Repairing with disassembling including reconditioning of part
- Y10T29/49725—Repairing with disassembling including reconditioning of part by shaping
- Y10T29/49726—Removing material
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Abstract
本发明涉及一种用于制造带涂层的透平动叶片的方法和一种用于轴流式透平转子的动叶片圈。通过该方法,可以使透平动叶片的频率特性特别简便地满足所需边界条件。为此建议,在给该透平动叶片(40)涂层之后,随之在透平动叶片(40)叶身(42)的叶片顶端引入凹槽。
Description
技术领域
本发明涉及一种用于制造带有涂层的透平动叶片的方法,其中,在透平动叶片上涂覆至少一个保护层,以及,在透平动叶片叶身的叶片顶端引入至少一个凹槽用于调整透平动叶片的固有频率。
背景技术
已知,透平动叶片配设有保护层,因此该透平动叶片在燃气轮机内工作时具有提高的寿命。在这里,经常在浇铸制成的透平动叶片上涂敷型号为MCrAlY的抗腐层作为保护层。在此,该保护层的涂敷在其表面的这个区域完成,该区域在燃气轮机工作时遭受热燃气。该区域包括透平动叶片的叶身以及平台,在该平台上有所述叶身成型。除抗腐层以外,还可以在前面所述区域涂敷隔热层,以便热燃气尽可能少地将热量传入透平动叶片的基材中。
另外还已知,透平动叶片在燃气轮机工作时会遭受振动激励。基于转子的转动会形成振动激励,在该转子上固定所述透平动叶片。该透平动叶片的叶身通过撞在其上的热燃气也能被激励产生振动。因为所述透平动叶片的叶身(从热燃气流动的方向看)在透平导向叶片圈后旋转,通过热燃气的周期性撞击,就能激励这个透平动叶片发生振动。因此,每个透平动叶片必须具有足够高的固有频率,以使得由转子转速和热燃气分别以各自的激励频率引起的振动激励不会导致叶身产生不被许可的高频振动。相应地,在现有技术中这样设计所述透平动叶片,即,使其固有频率偏离固定式燃气轮机的激励频率。因此,在开发设计透平动叶片的过程中应该注意,制成的透平动叶片总的来说要满足自然谐振方面的要求。
因此,在透平动叶片制造过程中规定,对每个单独的透平动叶片的振动特性都要进行检验。只要所述透平动叶片不能满足固有频率的给定值时,就弃掉该透平动叶片或借助合适的措施来操纵该透平动叶片,使该透平动叶片在此之后适合工作并满足固有频率的要求。已知,为了使那些仅仅基于其振动特性规定不能用于燃气轮机的透平动叶片还能获得应用,在透平动叶片的叶身的端侧引入凹槽,亦即开设凹穴,由此可以在透平动叶片的可振动的自由端减小其叶片质量。通过减小透平动叶片的质量可积极地影响它的振动特性。通过特别是在其外侧的一端去除质量可提高叶片的固有频率。
此外业已公知的是,对之前应用在燃气轮机中的透平动叶片采取一些延长使用寿命的措施。这些措施包括一方面消除工作过程中产生的裂纹,另一方面更新设置在透平动叶片上的保护层。
发明内容
本发明的目的在于,提供一种用于制造带有涂层的透平动叶片的方法,其固有频率满足在固定式燃气轮机中使用该透平动叶片的要求。
与该方法相关的目的通过一种具有如权利要求1所述特征的方法实现,其中,从属权利要求反映本发明方法有利的设计。
本发明从该认识出发,即,应该在给透平动叶片涂层之后引入凹槽用于调节固有频率。只有在透平动叶片涂层之后才可达到最终外形和最终重量,其中,所述透平动叶片的固有频率(谐振频率)也取决于此。尤其是在透平动叶片上涂敷抗腐层后导致质量显著增加,并由此使得所涉及的透平动叶片的固有频率减小。因此,产生危险,即,所述透平动叶片的固有频率到达振动频率的附近,以致在燃气轮机工作时更可能产生损害透平动叶片或叶身或缩短其寿命的振动激励。在燃气轮机工作时连续地受到振动激励并连续振动的透平动叶片,断裂危险增大且寿命缩短。该透平动叶片由于振动激励受到的负载也称作HCF负载(高周疲劳)。
本发明建议,特别是对于那些已经用过的透平动叶片,亦即那些已经消耗了一部分寿命并应该通过所谓的整修(翻新)而延长使用寿命的透平动叶片,为将它们应用在固定的燃气轮机中,对它们进行调整。因为所述整修常常包括给透平动叶片去涂层以及在前面提到的区域再次涂层,所以在涂层之后对该翻新的透平动叶片要进行固有频率的检查,其中,必要时通过在叶片顶端去掉质量来改善叶片顶端的振动特性。通过在透平动叶片的自由端去除质量,使固有频率偏离激励频率。
经常在翻新透平动叶片的时候,也对燃气轮机实施了所谓的升级(现代化),这应通过许可热气温度的提升致使燃气轮机有较高的功率输出及改善的效率。该较高的许可热气温度致使,必须将比原设计厚度更大的抗腐层和隔热层涂在所述去除过涂层的透平动叶片上,因此,这个透平动叶片也可承受较高的温度。该较大的涂层厚度导致质量增加。为了补偿质量增加和再次达到透平动叶片原有的振动特性,在叶片顶端的端侧朝透平动叶片的根部方向打一个孔。由此,在透平动叶片的自由端移除与振动关系重大的质量。在透平转子中安装透平动叶片之后使得这些透平动叶片组成按本发明的、用于透平转子的叶片圈,那么,该透平尤其不受热燃气引发的叶片振动激励的影响。优选地在此按照本发明的方法制造叶片圈中所有的透平动叶片。
打孔的深度最深可达所述叶身(相对于透平动叶片在固定式燃气轮机中的安装位置的)径向长度的50%。这是可行的,因为在该区域中,叶片中出现相对较小的机械负载并且虽然有大的离心力也允许削弱材料横断面。优选地沿着叶身中心线打多个钻孔。所述中心线不必在此穿过所打的孔。该孔也可以配置在叶身中心线的两侧。总之,通过这样配置保持了透平动叶片的完整性和强度不受影响。在此规定,当通过在叶身中打钻孔应该去掉给定大小的质量时,不应打较大数量的浅孔而应该打较小数量的较深的孔。
该方法也可优选应用在具有内冷却式叶身的透平动叶片中。在这种情况下,在叶片的这样一些位置上配置所述钻孔,即,在吸力侧和压力侧的叶片壁之间的所谓支撑肋与这些钻孔交汇。此外,有选择地或附加地可在叶片的后缘段内引入钻孔,在该后缘段处吸力面和压力面汇聚在一起。为了避免透平动叶片在钻孔或凹槽的内部被腐蚀,可以规定,开设钻孔之后,借助栓塞或焊料在表面封闭其开口。然而这些钻孔在此并未被填充满,而是使空的孔腔保留了下来。
附图说明
下面根据附图详细阐述本发明,图中相同的附图标记表示相同作用的部件。附图中:
图1示出按本发明的用于制造带有涂层的透平动叶片的方法;
图2示出用于翻新用过的透平动叶片的流程和方法;
图3是一个叶片顶端侧开设有钻孔的透平动叶片的叶身的立体透视图;
图4是根据本发明的内冷却式透平动叶片的横截面图。
具体实施方式
图1中表示按本发明的方法10。该用于制造带涂层的透平动叶片的方法10包括第一步骤12中的在透平动叶片上涂覆保护层。其中,该保护层优选型号为MCrAlY的抗腐层。可选地也可以配置双层保护层,该保护层作为粘结层包括型号为MCrAlY的涂层,在其上的外侧还涂敷有陶瓷隔热层(隔热的TBC层)。因为所述透平动叶片通常是浇铸出来的并且相应地包含浇铸而成的基体,通过涂敷保护层特别是抗腐层,其质量进一步增大。在第二个方法步骤14中,可以通过在所述透平动叶片叶身的叶片顶端引入凹槽来补偿随质量增大而引起的透平动叶片频率的变化。在此规定,在所述透平动叶片的端侧引入这样多和这样深的凹槽,直到透平动叶片满足固有频率方面的要求为止。在此,有可能出现这样的情况,即,尽管应用了按本发明的方法,但仍没能足够大地影响该叶片的固有频率以使叶片满足频率方面的要求。在这种情况下,该透平动叶片不适合进一步应用。
图2中表示方法20,其中使用过的,即已经在固定式燃气轮机运行时用过的透平动叶片,通过再处理过程(所谓的整修)部分翻新。此整修用作增长透平动叶片寿命的方式。因此,在第一方法步骤22中,所述透平动叶片遭受到燃气轮机工作时的热燃气。在检查或维修燃气轮机时,拆除透平动叶片并只要该叶片可以再处理就进行再处理程序。在此,再处理程序包括步骤24,在该步骤中,必要时将涂层的透平动叶片去掉涂层。例如当保护层中存在中等大小或较大的裂纹时,或部分剥落或磨损而使得实际厚度缩小到低于必要的最小量时,必须除去涂层。在下面可选的步骤26中,必要时通过已知修复工艺可消除在透平动叶片的基材中产生的裂纹。在下一步骤28中,随后将一层或两层保护层重新涂敷在透平动叶片上。紧跟其后在最后一步骤30中,在叶片顶端的端侧朝透平动叶片的根部方向开设钻孔,用于调整透平动叶片的固有频率。
图3中部分地表示了一个透平动叶片40的透视图。所述透平动叶片40包括众所周知的、图中未示出的枞树形叶片根部,在该根部上连接有一个图中未示出的叶片平台。在该叶片平台上配置有一个自由悬伸的叶身42,该叶身截面呈水滴状并设计成按空气动力学弯曲。所述叶身42包括压力面44和吸力面46。图3仅示出了叶片顶端48,它位于叶身42在该平台上的固定端的对面。所述叶身42在叶片顶端48与叶片平台之间具有高度H,该高度是相对于其在一个轴流固定式燃气轮机中的安装位置而沿径向测得的。所述按空气动力学弯曲的叶身42包括一条中心线50,该中心线在吸力面46和压力面44之间从叶片前缘到后缘。所述叶身中心线50在图中用点划线的形式表示。沿叶身中心线50分布设置例如四个钻孔52状的凹槽,这些钻孔从叶身42的端侧朝透平动叶片40的根部方向延伸。借助所述钻孔52在透平动叶片40的自由端减小了叶片重量,由此将固有频率推移到更高的频率。
借助设置于叶片端侧的钻孔可以使其固有频率偏移大约10%。图3中所示叶身42在此未冷却。
图4表示通过按本发明方法制造的透平动叶片40的叶身42的横截面。该截面截取自叶片顶端48区域。按图4所示,该透平动叶片40包括一个浇铸制成的基体41,不仅在该基体的吸力面一侧还是压力面一侧都涂敷有一保护层54。该保护层54显著增加了透平动叶片40的质量,从而导致固有频率变小。为了补偿这种固有频率的偏移,在叶身42的端侧开设钻孔52。所述钻孔52设置在叶身42中的这样一些位置上,即,在这些位置上,存在于叶身内部的支撑肋56与压力面或吸力面一侧的叶片壁44,46相连。也可以规定,在透平动叶片40的后缘区域开设钻孔52,在该后缘区域处,吸力面一侧的压力壁46与压力面一侧的叶片壁44合为一体,这些钻孔在此优选地分布于叶身中心线段上。
因此,总的来说本发明建议一种用于制造带涂层的透平动叶片40的方法,该叶片的频率特性可以特别简单地与所要求的边界条件相匹配。为此规定,在给透平动叶片涂层之后,在透平动叶片40叶身42的叶片顶端48中引入凹槽。由此提供了一种方法,用该方法可以特别简单和可变化地调整透平叶片的振动特性。因此可以减少透平动叶片40的废品率。同样也可对由于设计改变而不能使用的透平动叶片进行调节,使这些透平动叶片再次满足至少在固定频率方面的要求。也能用按本发明的方法在整修过程中翻新已用过的透平动叶片,然后重新予以应用。
Claims (6)
1.一种用于制造带有涂层的透平动叶片(40)的方法(10,20),其中,将至少一层保护层涂于透平动叶片(40)上,以及,为了调整所述透平动叶片(40)的固定频率,在所述透平动叶片(40)叶身(42)的叶片顶端(48)引入至少一个凹槽,其特征在于,在给所述透平动叶片(40)涂层之后引入所述凹槽,其中,在所述叶片顶端(48)朝所述透平动叶片(40)叶片根部的方向开设钻孔(52)作为所述凹槽,并且开设多个沿着所述叶身中心线(50)分布的所述钻孔(52)。
2.按权利要求1所述的方法(10,20),其中,所述孔的深度最大可达所述叶身(42)相对于所述透平动叶片(40)的安装位置的径向长度的50%。
3.按权利要求1或2所述的方法(10,20),该方法在去除透平动叶片(40)的涂层之后实施。
4.按权利要求1或2所述的方法(10,20),该方法应用于带有内冷却式叶身(42)的透平动叶片(40)。
5.按权利要求1或2所述的方法(10,20),其中,重新封闭所述凹槽。
6.按权利要求1或2所述的方法(10,20),其中,在所述透平动叶片上涂敷抗腐层和/或隔热层作为所述保护层(54)。
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EP07008237.5 | 2007-04-23 | ||
EP07008237A EP1985803A1 (de) | 2007-04-23 | 2007-04-23 | Verfahren zum Herstellen von beschichteten Turbinenlaufschaufeln |
PCT/EP2008/054338 WO2008128902A1 (de) | 2007-04-23 | 2008-04-10 | Verfahren zum herstellen von beschichteten turbinenlaufschaufeln und laufschaufelring für einen rotor einer axial durchströmten turbine |
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EP (2) | EP1985803A1 (zh) |
JP (1) | JP2010525229A (zh) |
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Also Published As
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EP1985803A1 (de) | 2008-10-29 |
CA2684810C (en) | 2013-02-05 |
ATE483097T1 (de) | 2010-10-15 |
WO2008128902A1 (de) | 2008-10-30 |
CA2684810A1 (en) | 2008-10-30 |
US20100129554A1 (en) | 2010-05-27 |
DE502008001450D1 (de) | 2010-11-11 |
RU2430239C2 (ru) | 2011-09-27 |
CN101663465A (zh) | 2010-03-03 |
RU2009142996A (ru) | 2011-05-27 |
EP2137381B1 (de) | 2010-09-29 |
MX2009010923A (es) | 2009-11-02 |
PL2137381T3 (pl) | 2011-04-29 |
US8607455B2 (en) | 2013-12-17 |
EP2137381A1 (de) | 2009-12-30 |
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JP2010525229A (ja) | 2010-07-22 |
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