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公开(公告)号：EP1048850B1
公开(公告)日：2006-07-19
申请号：EP99900291.8
申请日：1999-01-13
申请人： EBARA CORPORATION
CPC分类号： F04D29/2255 , F04D29/24 , F04D29/30
摘要： A centrifugal turbomachinery capable of preventing an excessive increase in the manufacturing cost, adapted to effectively reduce a secondary flow in a vane wheel flow passage and reduce a loss, which is ascribed to the secondary flow, to a minimum level, and having a high efficiency, comprising a vane wheel provided with a plurality of vanes (3) between a central inlet (6a) and an outer circumferential outlet (6b), and a flow passage formed between these vanes and used to send a fluid from the inlet to the outlet by the rotation of the vane wheel, the portions of the vanes (3) which are on the side of a hub (2) having a circumferential inclination preceding in the rotational direction of the vane wheel with respect to the portions of the vanes which are on the side of a shroud (4), the angle of inclination of the vanes which is defined as an angle of the vanes formed in a plane viewed from the outlet of the flow passage with respect to a plane perpendicular to a hub surface having a tendency to decrease from the inlet toward the outlet, whereby the center lines of a shroud-side portion and a hub-side portion viewed from a front part of a vane inlet cross each other in a position where a ratio of dimensionless radius to a radius of the outlet is 0.8-0.95.
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公开(公告)号：EP1048850A1
公开(公告)日：2000-11-02
申请号：EP99900291.8
申请日：1999-01-13
申请人： EBARA CORPORATION
CPC分类号： F04D29/2255 , F04D29/24 , F04D29/30
摘要： The present invention provides a centrifugal turbomachinery having a good performance which can effectively reduce the secondary flow in the flow passage of the impeller and minimize the loss caused by the secondary flow without an excessive increase in manufacturing cost. An impeller has a plurality of blades (3) between an inlet (6a) at a central portion and an exit (6b) at a peripheral portion, and a flow passage formed between the blades for delivering fluid from the impeller inlet to the impeller exit by rotation the impeller. The blade (3) is leaned toward a circumferential direction so that the blade at the hub side (2) precedes the blade at the shroud side (4) in a rotational direction of the impeller. A blade lean angle, defined as an angle between the blade and a surface perpendicular to a hub surface as viewed from the direction of the exit, shows a decreasing tendency from the inlet to the exit. A blade centerline at the hub side and a blade centerline at the shroud side as viewed from the front direction at the inlet intersect at a point where non-dimensional radius location, defined as a ratio of the radius of the intersection to the radius of the impeller exit, ranges from 0.8 to 0.95.
摘要翻译： 本发明提供了一种具有良好性能的离心式涡轮机械，其能够有效地减少叶轮的流动通道中的二次流动并且最小化由二次流引起的损失，而不会过度增加制造成本。 叶轮具有在中心部分的入口（6a）和周边部分的出口（6b）之间的多个叶片（3）和形成在叶片之间的流动通道，用于将流体从叶轮入口输送到叶轮出口 通过旋转叶轮。 叶片（3）朝向圆周方向倾斜，使得轮毂侧（2）处的叶片在叶轮的旋转方向处在护罩侧（4）处的叶片之前。 从出口方向观察时，被定义为叶片与垂直于轮毂表面的表面之间的角度的叶片倾斜角显示出从入口到出口的减小的趋势。 轮毂侧的叶片中心线和在入口处从前方观察的护罩侧的叶片中心线在无量纲半径位置处的点处相交，所述点的尺寸半径位置被定义为交点的半径与半径的比率 叶轮出口范围为0.8至0.95。
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