Profiled surface used as an abradable in flow machines
US6457939B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2000 |
| Grant date | Oct 1, 2002 |
| Priority date | — |
| Expiry date | Dec 19, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24149
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.