Impeller shroud and method of manufacturing thereof
AssigneePratt & Whitney Canada Corp.
InventorsAlexandre Capron, Bernard Chow
Life of this patent
Estimating the term…
Abstract
A shroud configured to be disposed around an impeller of a centrifugal compressor, the shroud has a wall extending circumferentially around a central axis, the wall having an inner face oriented toward a gaspath and an outer face opposed to the inner face, a bleed slot defined in the wall and extending along at least a portion of a circumference thereof, the bleed slot defining a bleed direction from the inner face and away from the gaspath, the bleed direction at the inner face of the wall being either parallel to the central axis or oriented toward the central axis. A method of manufacturing a shroud is provided.
Claims18
A method of manufacturing a shroud for an impeller, the shroud extending circumferentially around a central axis and defining an inner face oriented toward the central axis and an opposed outer face, the method comprising:
- creating an inner cut circumferentially extending about the central axis, the inner cut defining an inner cut outline and extending from the inner face toward the outer face;
- creating an outer cut defining an outer cut outline and extending from the outer face toward the inner face;
- wherein the creating of the inner cut and the creating of the outer cut includes overlapping the inner and outer cut outlines at at least one circumferential location relative to the central axis by increasing a depth of one of the inner cut and the outer cut with a milling tool up to a point where an end of the milling tool is entirely received within the other of the inner cut and the outer cut such that, at the at least one circumferential location, a tip section of one of the inner cut outline and the outer cut outline is enclosed by the other of the inner cut outline and the outer cut outline.
A method of manufacturing a shroud for an impeller, the shroud extending circumferentially around a central axis and defining an inner face oriented toward the central axis and an opposed outer face, the method comprising:
- creating an inner cut from the inner face and extending circumferentially about the central axis, the inner cut having an inner cut outline;
- and
- creating an outer cut from the outer face and extending circumferentially about the central axis along a portion of a circumferential length of the inner cut, the outer cut having an outer cut outline,
- wherein the creating of the inner cut and the creating of the outer cut includes creating an opening between the inner cut and the outer cut with a milling tool up to a point where an area of the opening is independent of an increase of a depth of the milling tool through the shroud.
A method of manufacturing a shroud for an impeller, the shroud extending circumferentially around a central axis and defining an inner face oriented toward the central axis and an opposed outer face, the method comprising:
- creating a first cut defining a first cut outline and extending from one of the inner face and the outer face toward the other of the inner face and outer face;
- creating a second cut defining a second cut outline and extending from the other of the inner face and outer face toward the one of the inner face and the outer face;
- wherein one or both the first cut and the second cut extends circumferentially relative to the central axis,
- wherein the creating of the first cut and the creating of the second cut includes overlapping the first and second cut outlines at at least one circumferential location relative to the central axis by increasing a depth of the second cut with a milling tool until a tip section of the first cut outline is machined away by the milling tool such that, at the at least one circumferential location, the tip section of the first cut outline is enclosed by the second cut outline.
Dependencies are inferred from the claim text.