CN105545374A - 柔性薄膜骑缝密封 - Google Patents
柔性薄膜骑缝密封 Download PDFInfo
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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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/14—Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing
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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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/001—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between stator blade and rotor
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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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
-
- 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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/025—Seal clearance control; Floating assembly; Adaptation means to differential thermal dilatations
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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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
-
- 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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/14—Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing
- F01D11/16—Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing by self-adjusting means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/441—Free-space packings with floating ring
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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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
-
- 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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/10—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using sealing fluid, e.g. steam
-
- 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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/12—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
一种用于旋转机械的密封设备,包括:多个密封组件节段,其围绕转子元件,转子元件安装用于绕纵轴线旋转并且具有外表面,各个节段包括:底座,包括:面朝外表面的一个或更多个迷宫式齿;以及底座板,其布置在一个或更多个迷宫式密封齿下游并且构造为在底座板和转子元件的外表面之间产生空气动力,其中,底座还构造为在径向-轴向平面上响应于通过密封组件节段和转子元件的互相作用产生的流体薄膜力成柔性;以及轴向朝向横杆弹簧,其将底座连接至静止密封主体。
Description
技术领域
本发明大体涉及用于涡轮机的密封组件,并且更特定地涉及用于密封转子-定子间隙等的薄膜骑缝密封组件。
背景技术
例如燃气涡轮发动机、航空发动机以及蒸汽涡轮机的各种类型的涡轮机是公知的并广泛地用于功率产生、推进等。涡轮机的效率部分取决于在内部构件之间的缝隙,和穿过这些缝隙的初级和次级流体的泄漏。例如,大缝隙可在某些转子-定子分界面处被意图地允许来使用大、热或机械感应的相对动作。从高压区域至低压区域的穿过这些间隙的泄漏可导致用于涡轮机的低效率。这样的泄漏可影响效率,因为泄漏的流体不能执行有用功。
不同类型的密封系统用来缩小流动穿过涡轮机的流体的泄漏。但是,密封系统通常在可增加或减少穿过其的缝隙的各种操作阶段期间遭受相对高的温度、热梯度以及热及机械膨胀和收缩。例如,组装来在启动瞬时阶段期间运行十分紧凑的缝隙的传统的迷宫式密封可在稳定状态操作期间在大密封下运行,因而导致在稳定状态操作期间的低性能。
在迷宫式密封的性能上进行改善的一种已知类型的密封是“薄膜骑缝”密封,其中,密封的定子部分位于薄空气薄膜上,从而允许其沿着密封的转子部分。为了使这种类型的密封正确地起作用,必须能够产生充足的位移,来在空气薄膜力和弹簧力之间实现平衡。由于空气薄膜的该十分小的厚度对由操作条件(例如,离心力、不均匀的温度分布等)引起的转子或定子的变形十分敏感。因为在定子和转子之间的相对变形增加密封空气薄膜下降的负载承受能力,并且可发生接触。现有技术设计使用刚性上升几何形状,其不能适应任何变形。这防止了密封产生足够的力来防止接触。
由此,存在对容忍转子表面的变形、允许坚固的密封的薄膜骑缝密封的需要。
发明内容
该需要通过本发明解决,本发明提供了一种薄膜骑缝箔密封,其为柔性的,以便能够适应相对的密封表面的形状的变化。
附图说明
可通过参照结合附图做出的下列描述而最好地理解本发明,其中:
图1是在静止条件下的根据本发明的实施例构造的旋转机械的薄膜骑缝密封组件的剖视图;
图2是图1的密封组件的后视主视图;以及
图3是在偏移条件下的图1的密封组件的剖视图。
具体实施方式
参考附图,其中遍及多种视图相同的标号代表相同的元件,图1绘出了根据本发明的方面构造的示例性密封组件10。
密封组件10分别与具有前端和后端14、16的转子元件12互相作用,该转子元件12安装用于绕纵轴线18旋转。
注意到的的,如在本文中所使用的,术语“轴向”或“纵向”意指平行于燃气涡轮发动机或其它涡轮机械的旋转轴线的方向,而“径向”意指垂直于轴向方向的方向,并且“切向”或“周向”意指互相垂直于轴向和切向方向的方向。(见在图1和2中的箭头“A”、“R”以及“T”)。如在本文中所使用的,术语“向前”或“前”意指在穿过或绕构件行进的空气流的相对上游的位置,而术语“向后”或“后”意指在穿过或绕构件行进的空气流中的相对下游的位置。该流的方向在图1中通过箭头“F”显示。这些方向术语仅仅用于描述的便利性而不需要由此描述的结构的特定朝向。
实际上,转子元件12可并入或安装至轴、盘、或其它旋转元件(未显示)。如在下面更详细地所描述,转子元件12具有弓形外表面20,其作为密封分界面的部分起作用。外表面20可包括带有第一半径的圆柱形前区段22和带有第二、较小半径的圆柱形后区段24。后区段24还可描述为相对前区段22凹入,并且面朝后阶梯26限定在前和后区段22和24的交叉点处。在操作中,转子元件12和密封元件10在前端14附近暴露于处于第一、相对更高静态空气压力“Phigh”的空气流,在后端16附近暴露于处于第二、相对较小静态空气压力“Plow”的空气流。在没有密封组件10的情况下,在Phigh和Plow之间的差异倾向于驱动用箭头“LF”指示的泄漏流,并且密封组件10的目的和功能为减少这样的泄漏流。
密封组件10包括具有定位为围绕转子元件12的前和后端30和32的密封主体28。实际上,密封主体可安装至或为涡轮机装置的周围静止结构的一部分。密封主体28可为单个连续环,或者其可包括环形排列的节段,其共同地限定完整环。在示出的实例中,密封主体28是成节段的。各个节段具有端面34并且可包括密封狭槽36,其构造为容纳已知类型的花键密封(未显示)来密封在相邻的端面34之间的泄漏。
后凸缘40从在其后端附近的密封主体28向内径向延伸。横杆类型的弹簧42的排列从后凸缘40向前轴向地延伸。可为密封主体28的各个区段提供单个弹簧42。
底座43包括一个或更多个密封齿、横杆47,并且底座板在各个弹簧42的前端46处承载。
一个或更多个弓形迷宫式密封齿44布置在底座43的前端处。在该特定实例中显示了单个密封齿44(备选地,两个或更多个密封齿44可布置成平行、轴向分开布置)。密封齿44朝向转子元件12径向向内延伸,并终止于离转子元件12的外表面20,具体地离外表面20的前区段22小、预定距离处。
底座43还包括从密封齿44向后且径向向内延伸的横杆47。底座板48布置在各个横杆47的后端50处。底座板48具有弓形内表面52。沿着轴向方向,内表面52是平坦的并且平行于转子元件12的外表面20。沿着周向方向,内表面52是弓形的。根据已知的流体动力轴承构造的原理,内表面52的弓形形状形成为,以便在径向缝隙中限定周向梯度,该径向缝隙在内表面52和外表面20之间。在图2中最佳可见的示出的实例中,内表面52的曲率半径被意图地加工为大于转子元件12的外表面20的半径。例如,在周界位置“C1”和“C2”处的径向缝隙可大于在中心位置“C3”处的径向缝隙。
次级密封54布置在密封主体28的前端30附近。次级密封54包括前凸缘56、中间凸缘58、密封叶60、反向弹簧62以及销64。密封叶60布置于在前和中间凸缘56、58之间限定的袋66中。反向弹簧62也布置于袋66中,并且布置为促使密封叶60轴向向后,使得其靠着中间凸缘58的外唇缘68,并且还靠着底座43的内唇缘70支承。销64轴向地延伸穿过凸缘56、58,反向弹簧62,以及密封叶60来将次级密封54保持在一起。次级密封54构造为节段的环,例如,存在提供用于密封主体10的各个节段的一个密封叶60、反向弹簧62以及销64。
在非限制实例中,密封组件10的构件(即,主体28、弹簧42、横杆47、以及底座板48)以及转子元件12和次级密封54可由一个或更多个已知的高温金属合金制成。密封组件10的各个节段可由单独的构件制成,该单独构件被制作并然后使用例如铜焊或焊接的工艺结合在一起。备选地,所有或部分的密封组件10可为单一构造,例如,由单个金属块加工成。
可选地,底座板48可覆盖有润滑和/或抗磨损涂层,例如,铬、镍、钼的基料,连同硬相和固体润滑剂。在另一非限制性实例中,涂层可包括钴基合金。这样的涂层可防止在底座板48和转子元件12之间的无意的摩擦期间的损坏。可选择地,转子元件12的外表面20可覆盖有碳化铬或碳化钨或相似的涂层来改进转子的硬度、抗腐蚀性和保持良好的表面光洁度的能力。
在操作期间,当转子元件与底座间隙开始减少(例如,在引起缝隙变化的热瞬态情况期间),薄流体薄膜“FF”开始产生附加压力。因而,当转子-底座板间隙变小(典型地小于1/1000英寸)时,流体薄膜FF在旋转的方向上单调地会聚或会聚-发散。处于流体楔的形式的流体薄膜引起额外的压力增加。薄薄膜的物理性质从流体动力轴颈轴承或箔带轴承良好地理解,并且可使用适当的流体流模型建模。基本原理为,在旋转方向上的流体薄膜厚度的任何负梯度将使在流体薄膜中的压力增加至其极限压力之上。由薄薄膜引起的额外压力使弹簧42偏离,将底座板48径向向外移动,并且保持转子元件12接触底座板48。在该意义上,转子元件12的任何向外偏移由底座板48跟随。换而言之,因为密封齿44通过横杆47物理地连接至底座板48,因而密封齿44与底座板48一致地偏移。该动作确保密封齿44将不在操作期间接触转子元件12的外表面20。面朝后阶梯26的存在确保了跨过迷宫式密封齿44产生初级压降,并且高速空气流不干扰流体薄膜FF。
横杆47的前和后端72和50分别刚性地联接至弹簧42的前端46和底座板48。横杆47的形状和尺寸选择为,使得底座板48的径向偏移被尽可能多地约束成单纯的径向移动(即,不带有旋转并且不带有沿着非径向轴线的平移)。换而言之,该布置抵抗底座板48的纵向倾斜。更具体地,作用在横杆47的后端50上的径向向外力导致弹簧的径向向外偏移和在弹簧42的前端46上的移动两者。如在图3中所显示,该移动与将倾向于倾斜底座板48的弹簧42的自然弯曲形状相反,并且替而代之地,引起弹簧42偏离成浅“S”形。为了实现正确的补偿,横杆47是弹簧42的轴向长度的大约一半。
在操作中,转子元件12遭受热和机械变形。如在图3中可见,这可引起外表面20的形状从基本圆柱形形状改变成弓形形状。如果如在现有技术设计中那样底座是刚性的,那么这将引起转子元件至底座间隙在底座板48的长度上变化,其中,间隙过大并且降低在一些位置中的在底座上的升力,并且间隙过小且可能在底座板48和外表面20之间接触。
为了解决该趋向,使底座板48为顺应性的或柔性的。为了实现这,包括其厚度的底座板48的整体尺寸选择为,使得当在操作期间遭受正常的机械和压力时,其将在轴向-径向平面中具有显著的柔性。在操作期间,流体薄膜FF在其中出现较小的间隙的位置处(例如,在外表面20由于热梯度而弯曲时)产生较大的力。与弹簧力相反,在离横杆47的后端一定距离处作用的该增加的力引起底座板48变形并配合外表面的形状,补偿间隙的尺寸。在图3中,底座板48显示为偏移成凹入向外形状。当外表面20恢复至名义圆柱形形状时,底座板48也恢复至其静止形状。该顺应性功能因而是自调节的。如在本文中所使用,关于底座板48使用的术语“顺应性的”或“柔性的”暗示着,其刚度充分低来通过在密封组件10的正常操作中产生的力单独地变形。这些力的大小将根据具体应用改变,但是典型地为大约数磅。
在操作中,次级密封54最初通过反向弹簧62的压力保持为靠着内和外唇缘70、68。压力差(Phigh-Plow)增加接触负载。在操作期间,转子12将倾向于在密封上关闭,因为离心生长和在转子12和定子之间的热不匹配。转子外表面20将朝向底座板48移动,从而引起其径向向外移动。这减少了在外和内唇缘68和70之间的距离,缩小了压力负载区域,降低了在密封叶60上的压力负载,并且减少了在密封齿44和次级密封54之间的摩擦。
在上面描述的密封组件10相对现有技术薄膜骑缝密封具有数个优点。通过转换刚性定子提升几何形状为柔性形状,密封可顺应转子变形,从而增加了密封的提升能力。本发明解决的另一问题为反向弹簧。而且,即使在施加高径向和轴向应力时,横杆弹簧42也可提供可接受量的径向移动、弹簧刚性、以及应力。最终,叶类型的次级密封比另一类型的密封更多地接受增加的公差。
前述已经描述了一种柔性薄膜骑缝密封。在该说明书(包括任何附图、摘要和图示)中公开的所有的特征,和/或所有的如此公开的任意的方法或工序的步骤可结合在除了其中这样的特征和/或步骤中的至少一些是互斥的组合之外的任意组合中。
在本说明书(包括任何所附权利要求、摘要以及附图)中公开的各个特征可被用于相同、等同或相似目的的备选特征替换,除非另外清楚地陈述。因而,除非另外清晰地陈述,公开的各个特征仅仅是等同或相似特征的一般系列的一个实例。
本技术不限于(多个)前述实施例的细节。本发明延伸至在本说明书(包括任何所附的新颖性的潜在点、摘要和图示)中公开的特征的任何一个新颖特征、或新颖特征组合,或者如此公开的任何方法或工序的步骤的任何一个新颖步骤、或任何新颖步骤组合。
Claims (12)
1.一种用于旋转机械的密封设备,包括:
多个密封组件节段,其围绕转子元件,所述转子元件安装用于绕纵轴线旋转并且具有外表面,各个所述节段包括:
底座,包括:
面朝所述外表面的一个或更多个迷宫式齿;以及
底座板,其布置在所述一个或更多个迷宫式密封齿下游并且构造为在所述底座板和所述转子元件的所述外表面之间产生空气动力,其中,所述底座还构造为在径向-轴向平面上响应于通过所述密封组件节段和所述转子元件的互相作用产生的流体薄膜力成柔性;以及
轴向朝向横杆弹簧,其将所述底座连接至静止密封主体。
2.根据权利要求1所述的密封设备,其中,所述密封主体包括环形排列的节段。
3.根据权利要求1所述的密封设备,还包括次级密封,其包括在其上游端处接触所述密封主体和所述底座的叶,以便密封在它们之间的泄漏,同时允许所述密封主体和所述底座的相对运动。
4.根据权利要求1所述的密封设备,其中,所述底座板通过横杆连接至所述弹簧,以便防止所述底座板的纵向倾斜。
5.根据权利要求4所述的密封设备,其中,所述横杆轴向地朝向,带有连接至所述弹簧的前端的前端,和连接至所述底座板的后端。
6.根据权利要求1所述的密封设备,其中:
所述外表面包括前第二区段和后区段,带有在它们之间限定的面朝后阶梯;
所述一个或更多个迷宫式齿布置为与所述前区段相反;以及
所述底座板布置为与所述后区段相反。
7.一种旋转机械设备,包括:
转子元件,其安装用于绕纵向轴线旋转,所述转子元件具有圆柱形外表面;
环形静止密封主体,其围绕所述转子元件;
轴向朝向横杆弹簧的排列,其从所述密封主体延伸;
底座,其联接至所述横杆弹簧中的每一个,所述横杆弹簧布置在所述转子元件和所述密封主体之间,各个底座包括:
环形迷宫式密封齿,其面朝所述外表面;
底座板,其布置在所述迷宫式密封齿下游并且构造为在所述底座板和所述外表面之间产生空气动力,其中,所述底座还构造为在径向-轴向平面中响应于通过所述底座板和所述转子元件的互相作用产生的流体薄膜力成柔性;以及
横杆,其使所述密封齿和所述底座板互相连接。
8.根据权利要求7所述的设备,其中,所述密封主体包括环形排列的节段。
9.根据权利要求7所述的设备,还包括次级密封,其包括在其上游端处接触所述密封主体和所述底座的叶,以便密封在它们之间的泄漏,同时允许所述密封主体和所述底座的相对运动。
10.根据权利要求7所述的设备,其中,所述横杆构造为以便防止所述底座板的纵向倾斜。
11.根据权利要求10所述的设备,其中,所述横杆轴向地朝向,带有连接至所述密封齿的前端,和连接至所述底座板的后端。
12.根据权利要求7所述的设备,其中:
所述外表面包括前第二区段和后区段,带有在它们之间限定的面朝后阶梯;
所述迷宫式齿布置为与所述前区段相反;以及
所述底座板布置为与所述后区段相反。
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WO2011156808A1 (en) * | 2010-06-11 | 2011-12-15 | Grondahl Clayton M | Film riding pressure actuated leaf seal assembly |
CN102654063A (zh) * | 2011-03-04 | 2012-09-05 | 通用电气公司 | 用于涡轮机的空气动力密封组件 |
US20140062024A1 (en) * | 2012-07-31 | 2014-03-06 | General Electric Company | Film riding seals for rotary machines |
US20140119912A1 (en) * | 2012-10-31 | 2014-05-01 | General Electric Company | Film riding aerodynamic seals for rotary machines |
Also Published As
Publication number | Publication date |
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EP3018298A1 (en) | 2016-05-11 |
BR102015027260A2 (pt) | 2016-08-02 |
US20160115805A1 (en) | 2016-04-28 |
CN105545374B (zh) | 2019-03-01 |
US10161259B2 (en) | 2018-12-25 |
JP6194343B2 (ja) | 2017-09-06 |
CA2909467A1 (en) | 2016-04-28 |
JP2016084937A (ja) | 2016-05-19 |
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