Profiled surface used as an abradable in flow machines
First Claim
1. A profiled surface for use as an abradable in flow machines having blade tips that move in a predetermined direction, the abradable comprising a profiled member including a multiplicity of ribs, each rib extending in a rib direction, the moving blade tips partially removing the abradable to form a partial abraded surface defined by abraded surface strips which extend in the directions of the ribs, the ribs being formed along connection lines between corner points of a reference grid, at least 80% of the abraded surface strips extending in rib directions which differ from the predetermined blade tip movement direction, at least two-thirds of the connection lines and therewith at least two-thirds of the abraded surface strips deviating from the predetermined blade tip movement direction by more than 30°
- , and wherein ends of the abraded surface strips are one of contiguous with each other and spaced apart from each other.
1 Assignment
0 Petitions
Accused Products
Abstract
The profiled surface is used as an abradable (1) in flow machines such as gas turbines where blade tips (2) move over the profiled abradable in a predetermined direction (v) to produce a partial abraded surface which is formed by material removal or ablation. The surface is formed by ribs (15) which surround chamber-like depressions (11) and extend in rib directions. The abradable (1) forms a pattern of strip-like elements (5) which lie in the directions of the ribs on connection lines (45) between corner points (41, 42; 43, 44) of a reference grid (40). Over at least more than 80-90% of the abraded surface the rib direction differs from the direction of movement (v) of the blade tips (2). For at least two-thirds of the abraded surface the direction of movement deviates from the rib direction by more than 30°, preferably more than 45°. The strip-like elements (5) of the abraded surface can be curved as well as discrete and/or partly connected strips.
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Citations
23 Claims
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1. A profiled surface for use as an abradable in flow machines having blade tips that move in a predetermined direction, the abradable comprising a profiled member including a multiplicity of ribs, each rib extending in a rib direction, the moving blade tips partially removing the abradable to form a partial abraded surface defined by abraded surface strips which extend in the directions of the ribs, the ribs being formed along connection lines between corner points of a reference grid, at least 80% of the abraded surface strips extending in rib directions which differ from the predetermined blade tip movement direction, at least two-thirds of the connection lines and therewith at least two-thirds of the abraded surface strips deviating from the predetermined blade tip movement direction by more than 30°
- , and wherein ends of the abraded surface strips are one of contiguous with each other and spaced apart from each other.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A flow machine comprising blade tips that move in a predetermined direction and an abradable facing the blade tips and comprising a profiled member including a multiplicity of ribs, each rib extending in a rib direction, the moving blade tips partially removing the abradable to form a partial abraded surface defined by abraded surface strips which extend in the directions of the ribs, the ribs being formed along connection lines between corner points of a reference grid, at least 80% of the abraded surface strips extending in rib directions which differ from the predetermined blade tip movement direction, at least two-thirds of the connection lines and therewith at least two-thirds of the abraded surface strips deviating from the predetermined blade tip movement direction by more than 30°
- , and wherein ends of the abraded surface strips are one of contiguous with each other and spaced apart from each other.
- View Dependent Claims (11, 12, 13, 14, 15)
- 16. A profiled surface for use as an abradable in flow machines having rotating blades which end in blade tips that move in a predetermined direction, the profiled surface including a multitude of ribs distributed over the surface and extending in rib directions, the movement of the blade tips removing some of the abradable material from the ribs to thereby form an abraded surface defined by abraded surface strips, at least 80% of the abraded surface strips extending in rib directions which differ from the predetermined movement direction of the blade tips.
Specification