CN1474036A - 汽轮机填料密封段的端面间隙密封及其改进 - Google Patents
汽轮机填料密封段的端面间隙密封及其改进 Download PDFInfo
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Abstract
在汽轮机的围绕转子的壳体(18,28)上的槽(34)内设置的相邻弓形密封段(26)的周向对齐的槽(54,62)中设置槽密封件(58,60,70,80,90)。该槽密封件在该密封段的端面(56)之间的间隙(50)内延伸以防止经过该端面的蒸汽泄漏或使其泄漏最小。槽密封件的方向可以是轴向或径向倾斜的以分别使径向倾斜方向和轴向方向上的蒸汽泄漏通道最小化,并/或可以是向下游径向倾斜的以密封轴向方向上的蒸汽泄漏。设置在槽(54,62)内的槽密封件可以作为原有设备制造中的一部分或通过在密封段内加工槽密封件作为改进设备来提供。
Description
发明背景
本发明涉及周向对齐的汽轮机的填料密封段,具体地,涉及在汽轮机固定填料壳体中的周向设置的首尾相连的填料密封段的端面之间的槽密封件和改进这种槽密封件的方法。
在汽轮机中,在其相对端的密封件或固定壳体内周向延伸有填料密封段,实现与转子间的密封。在一些汽轮机中,填料密封段设置于高中压汽轮机部分间的转子的中压相对端。这些密封段防止了从转子端或通过固定壳体内的汽轮机高中压部分之间的泄漏通道的蒸汽泄漏或使其泄漏最少。可以理解的是这些密封段沿周向延伸并具有在周向彼此对齐的端面。密封段的端面不是彼此密封的,所导致的蒸汽泄漏的存在给整个机组的性能带来不利影响。而且,有数种理由可以说明在密封段的端面之间不可能保持零间隙,其中包括制造误差,它的存在表明必须留有一间隙以容纳制造误差的范围。另外,机器的热变形会使原本设计成彼此有间隙的密封段变成在装置中连成一体。而且,大部分的密封段都是可以径向向外和向内移动的。这要求在密封段的端面之间,至少在密封段的径向最外端位置留有间隙。而且,如果围绕转子的壳体不是圆形,则在一个位置的间隙可能比其他的位置大。还有如果壳体的热变形大于填料密封段的热变形,则相对于汽轮机在冷运行条件下端面间隙的尺寸会增大。填料密封段的端面之间的蒸汽泄漏问题因此而变成一个极为重要的问题,因此,需要将汽轮机的周向填料密封段的端面的蒸汽泄漏通道最小化。
发明简述
本发明的一最佳实施例提供了一种设置在包围转子的填料密封壳体内的周向延伸环形填料密封段。该密封段具有位于周向对齐的端面之间的槽密封件,用于使通过该端面的蒸汽泄漏最少。相邻密封段的对齐端面具有容纳槽密封件的相应部分的槽。该槽密封件可具有一在周向对齐的槽之间延伸的平的金属薄板,这些周向对齐的槽或者布置在大体轴向方向上以排除径向的蒸汽泄漏,或者与汽轮机轴线成一角度或与其垂直以排除轴向的蒸汽泄漏。槽密封件自身可以由金属织物缠绕。槽密封件还可在相对端具有加大部分,用于置于对齐槽的底部。因此,跨接密封段之间的间隙的槽密封件的中心部分与槽的侧面之间有一定间隔,使得密封段能够在垂直于槽密封件的方向上有相对移动,而不会使槽密封件粘接到一起或被切断。
在汽轮机部分轴向隔开的位置上在汽轮机的相对端采用密封环密封段。因此,密封段的端面之间的槽密封件排除了汽轮机部分的轴向向外的蒸汽泄漏。还可以在高中压汽轮机部分之间设置这种槽密封件密封段以使从高压段至中压段的蒸汽泄漏最少。
本发明的一个特殊的优点在于可以对现有汽轮机进行改进,更新槽密封件,作为提高整机性能的方法。具体做法为,在正常的停机维修过程中,取下汽轮机的上半外壳体,将现有密封段从汽轮机壳体上卷出拆除。在端面内加工槽以容纳槽密封件。而后将密封段再卷回入上下半壳体,使槽密封件插入在相对的端面之间,如此改进之后降低了现有汽轮机的蒸汽泄漏。
本发明的一最佳实施例中提供了一种汽轮机,该汽轮机包括有一转子,该转子具有一汽轮机部分,还包括一围绕具有一汽轮机部分的转子的固定壳体,该壳体在从汽轮机部分轴向间隔开的密封位置围绕其自身带有多个周向延伸的填料密封段,用于壳体与转子间的密封。每一密封段具有分别与周向相邻的密封段的相对端面周向对齐的端面,该端面上具有狭槽,狭槽的开口朝向周向并大体彼此周向对齐,一槽密封件延伸在周向相邻密封段的相对端面中的每一个之间并位于狭槽内,用于防止经过对齐端面的蒸汽泄漏或使其泄漏最少。
在本发明的又一个最佳实施例中,提供了一种汽轮机,该汽轮机包括有一转子,该转子具有一汽轮机部分,还包括一围绕带有汽轮机部分的转子的固定壳体,该壳体具有一周向延伸的燕尾槽,在该燕尾槽内围绕该壳体具有多个周向延伸的填料密封段,该密封段具有迷宫式密封齿,用于实现与转子间的密封,每一密封段具有分别与周向相邻的密封段的相对端面周向对齐的端面,该端面上具有狭槽,狭槽的开口朝向周向并大体彼此周向对齐,一槽密封件延伸在周向相邻密封段的相对端面中的每一个之间并位于狭槽内,用于防止经过对齐端面的蒸汽泄漏或使泄漏最少。
在本发明的再一个实施例中,涉及一种汽轮机,该汽轮机包括有一转子,一围绕转子的固定壳体和多个周向延伸的环形填料密封段,这些密封段在围绕壳体的周向延伸的槽中,用于实现壳体与转子间的密封,本发明提供了一种改进环形填料密封段的方法,以在相邻环形填料密封段的相对端面之间提供密封,包括以下步骤:从汽轮机上取下填料环密封,在取下的填料环密封的每一端面上形成至少一个狭槽,在环形填料密封段的相对端面的狭槽中设置一槽密封件,将上述环形填料密封段插入壳体的槽中,由此槽密封件在相邻密封段之间延伸,用于防止相邻密封段之间的蒸汽泄漏或使其泄漏最少。
附图简述
图1示意性地示出了具有高压部分和中压部分的蒸汽轮机;
图2是一转子和壳体的局部放大的剖视图,示出了本发明的环形填料密封段的端面内的槽(spline)密封;
图3是一密封段的周向对齐端面的轴向局部示意图,其中在不同径向位置示出了端面间的不同间隙;
图4是沿图2中的线4-4所作的放大的剖视图;
图5是一槽密封件的平面视图;
图6是另一种形式的槽密封件的局部剖视图;
图7是再一种形式的槽密封件的示意图;
图8是一槽密封件的放大的剖视图,示出了覆盖它的金属编织物。
发明详述
参见附图,尤其是图1,其中示出了总体以10表示的汽轮机,此例中该汽轮机具有安装在一根转子16上的一高压汽轮机部分12和中压汽轮机部分14,该转子16延伸过汽轮机壳体18的相对端。可以想到是转子16由高压和中压汽轮机部分12和14驱动转动,而壳体18保持静止不动。周向延伸的填料密封段在壳体18的相对端20和22即在位置23位于固定壳体18内,从汽轮机部分12和14轴向间隔开。在所示的汽轮机中具有高、中压汽轮机部分,介于高、中压汽轮机部分12、14之间围绕轴16在位置24还分别设置有另外的周向延伸填料环密封。可以想到的是环形填料密封段端面上的槽密封件除了适用于所示出的汽轮机之外,还可以适用于其他类型的汽轮机或适用于其他的位置。
如图2所示,环形填料密封段26设置于一固定壳体28比如相应于汽轮机壳体18和转子16之间。另外的填料环30设置于汽轮机壳体的两个固定部件28和32之间,以下对密封段26的描述可以使其他所有的密封段变得清楚明了。
每一个弓形环形填料密封段26设置在壳体28的弓形燕尾槽34内,槽34具有相对的指向轴向的吊钩36。每一个周向密封段具有一设置在吊钩36和指向相对的吊钩40之间的颈部38,用于与固定壳体的吊钩36相接合,还具有一从颈部38在相对的轴向方向上延伸的弓形法兰42。法兰42上安装有多个沿转子16的外表面实现密封的迷宫式密封齿44。在图2所示的实施例中,环形填料密封段26的高压侧是密封段26的左侧,由此密封段26的面向轴向的弓形径向表面46轴向抵靠在吊钩36的相对的轴向表面上,形成密封。如图所示,环形填料密封段26在径向方向上是可移动的,正如众所周知的,它们有选择地形成绕转子的环状密封环。
可以想到绕燕尾槽34可以沿周向设置任意数量的环形填料密封段。例如,可以在壳体28的上半内设置三个或更多个密封段,并在壳体28的下半内设置相同数量的密封段。可以看出,在这样的布置方式中,在周向相邻的密封段26之间形成六个端面间隙50(如图3所示)。图3中示出了沿汽轮机中心线从轴向看的一对相邻的密封段26,它们的径向移动分别由实线和虚线表示出。由此看出相邻密封段之间的间隙50随着密封段的径向位置而变化。
根据本发明的一最佳实施例,在相邻密封段26的周向对齐的端面之间设置槽密封件。例如,如图4所示,在相邻的周向延伸的密封段26的每一端面内设置一槽或狭槽54。狭槽54与另一个狭槽周向对齐并容纳一横跨端面56间的间隙50的槽密封件58。槽密封件如图5所示可是一平的金属板,其形状大体为直线形。板的厚度小于狭槽54的深度以容纳密封段的相对径向移动,即容纳转子上的高、低状态。从图2和4中可以看出槽密封件58在轴向上沿法兰42的长度方向延伸过其绝大部分并介于相邻密封段26的相对端面之间。如此布置的结果是防止相邻密封段的端面之间径向方向上的蒸汽泄漏或使其泄漏最少。
另外,可以在相邻密封段26的端面之间设置另一个或第二个槽密封件60。槽密封件60(图2和4)设置在形成在端面56内周向对齐且大体径向向外延伸的槽或狭槽62内,最好与密封段26的下游端相邻。因此槽密封件60基本上沿径向延伸并防止了通过周向相邻密封段26之间的间隙50的在轴向方向上的蒸汽泄漏或使其泄漏最少。
可以理解本发明的密封段端面间隙密封可以作为原有设备制造中的一部分或通过改进现有机械设备来提供。例如,为了更新改进槽密封件,拆卸现有的蒸汽轮机,即取下上部的外部和内部壳体,也将密封段取下,即通过从内部壳体的槽36沿周向滚动它们而将密封段取下。而后可以在密封段的端面内加工槽54和62以容纳槽密封件。如此制成槽后,可以将密封段滚动回入内部壳体的燕尾槽34内,而使槽密封件即密封58和60插入相邻端面之间的槽内。另外,当然也可以使用带有已经加工好的槽的新的填料密封段,而不用在改进的填料密封段上再加工槽。
参见图6,其中示出了另一种形式的槽密封件70,它位于密封段26的周向相对端面56内的狭槽或槽,例如狭槽54内。槽密封件70具有一带有加大部分73的密封体71,加大部分73沿该密封的相对端布置,用于靠近槽的底部。因此密封体71的中心部分72的尺寸与槽54的宽度和加大的端部相比,宽度减小,这便于密封段26在径向方向上的相对移动,而不会损坏槽密封件70。槽密封件70可以是共同拥有的美国专利5624227中公开的类型,本文引用该文件作为参考。
参见图7,其中示出了另一种形式的槽密封件。图7中的槽密封件80可以是由金属板材料制成的,具有一密封体81,其相对的端部在82相对卷曲或弯曲以形成沿槽密封件80的相对端的加大部分83。相对卷曲部分的边缘85面向密封体81的中心部分。加大部分83,与图5的槽密封件70的加大部分71一样,靠近槽54的底部设置且有利于密封段26的径向方向上的相对移动。在上述的专利中也公开了这种类型的槽密封件。
图8中示出了一种具有一由金属制成的中心芯部92且具有一织物覆盖层94的槽密封件90。该织物覆盖层可以是由金属、陶瓷和/或聚合纤维编织而成的织物层。该覆盖织物可以是共同拥有的美国专利5934687中公开的那种类型,本文中引用该文件作为参考。
从以上所述可以看出,槽密封件提供在弓形密封段的周向对齐端面之间的间隙内,并设置在围绕转子的汽轮机壳体的凹槽内。另外,槽密封件密封段还可以用在置于如图2所示的两个静止的壳体之间的环形填料密封段内。例如,如图2中所示,槽密封件96和98基本在轴向上延伸并与汽轮机的轴线相对倾斜。槽密封件96最小化或排除了在径向方向上的蒸汽泄漏,而槽密封件98防止了在径向和轴向方向上的蒸汽泄漏或使其泄漏最少。槽密封件96和98可以是本文所述的各种形式的槽密封件中的任一种。在以上所有的情形中,蒸汽泄漏通道被最小化,从而提供了机组的性能。
虽然以上结合目前认为是最具实用性且最佳的实施例对本发明进行了描述,但可以想到是本发明并不局限于以上公开的实施例,相反,在所附的权利要求的精神和范围内包含了本发明的各种替换的和等同的装置。
Claims (10)
1.一种汽轮机(10),包括:
一转子(16),该转子具有一汽轮机部分(12,14);
一包围具有所述汽轮机部分的转子的固定壳体(18,28);
所述壳体在和所述汽轮机部分轴向间隔的一密封位置(23)围绕所述壳体带有多个周向延伸的填料密封段(26),用于壳体与转子间的密封;
每一密封段具有分别与周向相邻的密封段的相对端面周向对齐的端面(56),所述端面上具有狭槽(54,62),狭槽的开口朝向周向并大体彼此周向对齐;和
一槽密封件(58,60,70,80,90),在周向相邻密封段的相对端面中的每一个之间延伸并位于所述狭槽内,用于防止蒸汽经过对齐的端面泄漏或使其泄漏最少。
2.如权利要求1所述的汽轮机,其特征在于每一所述槽密封件(58)大体沿轴向和切向方向延伸,用于沿大致径向方向密封蒸汽流防止其泄漏。
3.如权利要求1所述的汽轮机,其特征在于所述槽密封件(60)沿大致径向和周向方向延伸,用于沿大致轴向方向密封蒸汽流防止其泄漏。
4.如权利要求1所述的汽轮机,其特征在于每一所述密封段具有多个轴向间隔的迷宫式密封齿,用于转子的密封。
5.如权利要求1所述的汽轮机,其特征在于所述槽密封件(58)大致沿轴向和切向方向延伸,用于沿大致径向方向密封蒸汽流,防止其泄漏,第二槽密封件在周向相邻密封段的相对端面间延伸,所述第二槽密封件沿大致径向和周向方向延伸,用于沿大致轴向方向密封蒸汽流防止其泄漏。
6.一种蒸汽轮机,包括:
一转子(16),该转子具有一汽轮机部分(12,14);
一包围带有所述汽轮机部分的转子的固定壳体(18,28);
所述壳体具有一周向延伸的燕尾槽(34),在该燕尾槽内围绕所述壳体具有多个周向延伸的填料密封段(26),所述密封段具有迷宫式密封齿(44),用于密封转子周围;
每一所述密封段具有分别与周向相邻的密封段的相对端面周向对齐的端面(56),所述端面上具有狭槽(52,62),狭槽的开口朝向周向并大致彼此周向对齐;和
一槽密封件(58,60,70,80,90)在周向相邻密封段的相对端面中的每一个之间延伸并位于所述狭槽内,用于防止蒸汽经过所述对齐的端面泄漏或使其泄漏最少。
7.如权利要求6所述的汽轮机,其特征在于每一所述槽密封件(58)大致沿轴向和切向方向延伸,用于沿大致径向方向密封蒸汽流防止其泄漏。
8.如权利要求6所述的汽轮机,其特征在于每一所述槽密封件(60)沿大致径向和周向方向延伸,用于沿大致轴向方向密封蒸汽流防止其泄漏。
9.在一汽轮机中,该汽轮机包括有一转子(16),一包围该转子的固定壳体(18,28)和多个周向延伸的环形填料密封段(26),这些密封段设置在围绕该壳体的周向延伸的槽(34)中,用于实现壳体与转子间的密封,一种改进环形填料密封段以在相邻环形填料密封段的相对端面之间提供密封的方法,包括以下步骤:
从该汽轮机上取下该环形填料密封段;
在取下的环形填料密封段的每一端面上形成至少一个狭槽(54,62);
在该环形填料密封段的相对端面的狭槽中设置一槽密封件(58,60);和
将所述环形填料密封段插入壳体的槽中,由此该槽密封件在相邻密封段之间延伸,用于防止蒸汽流在相邻密封段之间泄漏或使其泄漏最少。
10.如权利要求9所述的方法,其特征在于还包括在所取下的环形填料段的每一端面内加工两个槽,在相对端面的每一槽中设置一槽密封件,由此该两个槽密封件在该汽轮机的密封段装置中的相邻密封段之间延伸。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US10/199,480 US6722850B2 (en) | 2002-07-22 | 2002-07-22 | Endface gap sealing of steam turbine packing seal segments and retrofitting thereof |
US10/199480 | 2002-07-22 |
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CN1474036A true CN1474036A (zh) | 2004-02-11 |
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CNA031328393A Pending CN1474036A (zh) | 2002-07-22 | 2003-07-22 | 汽轮机填料密封段的端面间隙密封及其改进 |
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US (1) | US6722850B2 (zh) |
EP (1) | EP1384856B1 (zh) |
JP (1) | JP2004052773A (zh) |
CN (1) | CN1474036A (zh) |
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CN101042057B (zh) * | 2006-03-22 | 2011-07-06 | 通用电气公司 | 控制汽轮机中泄漏的设备和方法 |
CN103375194A (zh) * | 2012-04-19 | 2013-10-30 | 通用电气公司 | 用于涡轮系统的密封件 |
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CN101324193B (zh) * | 2007-06-15 | 2011-01-19 | 程建平 | 径向双流式汽轮机 |
CN103375194A (zh) * | 2012-04-19 | 2013-10-30 | 通用电气公司 | 用于涡轮系统的密封件 |
CN112460630A (zh) * | 2020-10-27 | 2021-03-09 | 中国船舶重工集团公司第七0三研究所 | 一种燃气轮机高温区间隙平面间密封组件 |
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US6722850B2 (en) | 2004-04-20 |
EP1384856A2 (en) | 2004-01-28 |
EP1384856A3 (en) | 2004-09-15 |
EP1384856B1 (en) | 2013-12-18 |
JP2004052773A (ja) | 2004-02-19 |
US20040013522A1 (en) | 2004-01-22 |
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