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Patexia Research
Issue Date Feb 18, 2021
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Patent Application - SYSTEMS AND METHODS FOR MANUFACTURING A SHROUDED IMPELLER > Claims

  • 1. A method of manufacturing an impeller including a plurality of blades, a hub, and a shroud, the blades each include a tip, the shroud includes an inner surface and a ring extending from the inner surface, the method comprising: attaching the blades to the hub;applying a brazing compound to the tips of the blades and to the inner surface of the shroud;inserting the blades and the hub into the shroud such that the tips of the blades press against the ring, wherein the ring and the tips of the blades form an interference fit between the ring and the tips of the blades that maintains a consistent gap between the shroud and the blades during manufacture of the impeller; andattaching the blades to the shroud using a brazing process.
    • 2. The method of claim 1, wherein a position of the shroud relative to the blades is fixed by the ring during the brazing process.
    • 3. The method of claim 1, wherein inserting the blades and the hub into the shroud such that the tips of the blades press against the ring comprises inserting the blades and the hub into an inlet of the shroud such that the tips of the blades press against the ring.
    • 4. The method of claim 1, wherein the at least one ring includes a first ring positioned proximate an inlet of the shroud and a second ring positioned proximate an outlet of the shroud.
      • 5. The method of claim 4, wherein inserting the blades and the hub into the shroud such that the tips of the blades press against the ring includes inserting the blades and the hub into the shroud such that the tips of the blades proximate the inlet press against the first ring.
      • 6. The method of claim 4, wherein inserting the blades and the hub into the shroud such that the tips of the blades press against the ring includes inserting the blades and the hub into the shroud, such that the tips of the blades proximate the outlet rest against the second ring and such that the second ring maintains the blades and the hub in position during the brazing process.
    • 7. The method of claim 1, wherein attaching the blades to the shroud using a brazing process includes attaching the blades to the shroud using a dip brazing process.
  • 8. A compressor comprising: a compressor housing; andan impeller positioned within the compressor housing, the impeller comprising: a hub including a hub surface;a plurality of blades extending from the hub surface; anda shroud including an inner surface attached to the blades and at least one ring extending from the inner surface, wherein the ring is configured to engage the blades when the blades and the hub are inserted into the shroud and to maintain a consistent gap between the shroud and the blades during manufacture of the impeller.
    • 9. The compressor of claim 8, wherein the at least one ring includes a first ring positioned proximate an inlet of the shroud and a second ring positioned proximate an outlet of the shroud.
      • 10. The compressor of claim 9, wherein the blades each include a blade tip extending along a length of the blade, and the tips of the blades proximate the inlet press against the first ring.
        • 11. The compressor of claim 10, wherein the tips of the blades proximate the outlet rest against the second ring.
      • 12. The compressor of claim 9, wherein the first ring and the second ring each include a rounded bump including an apex, a first edge, and a second edge.
        • 13. The compressor of claim 12, wherein the first ring and the second ring each define a height between the inner surface and the apex.
    • 14. The compressor of claim 8, wherein the height is about 0.001 inches to about 0.006 inches.
  • 15. An impeller comprising: a hub including a hub surface;a plurality of blades extending from the hub surface; anda shroud including an inner surface attached to the blades and at least one ring extending from the inner surface, wherein the ring is configured to engage the blades when the blades and the hub are inserted into the shroud and to maintain a consistent gap between the shroud and the blades during manufacture of the impeller.
    • 16. The compressor of claim 15, wherein the at least one ring includes a first ring positioned proximate an inlet of the shroud, and a second ring positioned proximate an outlet of the shroud.
      • 17. The compressor of claim 16, wherein the blades each include a blade tip extending along a length of the blade, and the tips of the blades proximate the inlet engage the first ring.
        • 18. The compressor of claim 17, wherein the tips of the blades proximate the outlet rest against the second ring.
    • 19. The compressor of claim 15, wherein the consistent gap defines a consistent gap width.
      • 20. The compressor of claim 19, wherein the consistent gap width is about 0.001 inches to about 0.006 inches.
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