Rotor for a turbomachine

• US 20060188375A1
• Filed: 02/18/2005
• Published: 08/24/2006
• Est. Priority Date: 02/18/2005
• Status: Active Grant

• Current Assignee: Mario Bussieres
• Original Assignee: Mario Bussieres
• Inventors: Bussieres, Normand, Bussieres, Mario
• Granted Patent: US 7,214,035 B2
• Time in Patent Office: Days
• US Class Current: 416/220.R
• CPC Class Codes: F01D 5/025 Fixing blade carrying members on shafts attachment of a member on a shaft in general F16D1/06; for non-positive displacement pumps F04D29/00
• CPC Class Codes: F01D 7/00 Rotors with blades adjustable in operation; Control thereof for reversing F01D1/30
• CPC Class Codes: F04D 29/36 adjustable flexible blades F04D29/382
• CPC Class Codes: F05B 2240/313 with adjustable flow intercepting area F05B2240/312 takes precedence

Abstract

A rotor for a turbomachine. The rotor comprises a hub including a peripheral surface, a first side surface, and a second side surface. The hub defines a plurality of cavities, each one of the cavities extending inwardly from the peripheral surface. The hub also defines a plurality of openings, each one of the openings extending from a corresponding one of the cavities to at least one of the first side surface and the second side surface. The rotor further comprises a blade coupled to the hub. The blade includes an end portion fitting in a particular one of the cavities and screwably secured to the hub. A particular one of the openings extending from the particular one of the cavities is adapted to receive a constraint element engaging the end portion.

Claims

1. In combination:

a rotor hub including a peripheral surface, a first side surface, and a second side surface, said rotor hub defining a plurality of cavities, each one of said cavities extending inwardly from said peripheral surface, said rotor hub defining a plurality of openings, each one of said openings extending from a corresponding one of said cavities to at least one of said first side surface and said second side surface; and

a rotor blade adapted to be coupled to said rotor hub, said rotor blade including an end portion adapted to fit in a particular one of said cavities and screwably securable to said rotor hub, a particular one of said openings extending from said particular one of said cavities being adapted to receive a constraint element engaging said end portion when said end portion is secured to said rotor hub.

2. The combination of claim 1, wherein said particular one of said cavities has an externally threaded part located therein and said end portion of said rotor blade has an internally threaded part complementary to said externally threaded part, said end portion being screwably securable to said rotor hub via said externally threaded part and said internally threaded part.

3. The combination of claim 2, wherein said externally threaded part is integral with said rotor hub.

4. The combination of claim 1, wherein said particular one of said cavities has an internally threaded part located therein and said end portion of said rotor blade has an externally threaded part complementary to said internally threaded part, said end portion being screwably securable to said rotor hub via said externally threaded part and said internally threaded part.

5. The combination of claim 4, wherein said externally threaded part is integral with said end portion of said rotor blade.

6. The combination of claim 1, wherein said rotor hub defines a hole extending inwardly from a bottom surface of said particular one of said cavities and said end portion of said rotor blade has an internally threaded part, said end portion being screwably securable to said rotor hub via said internally threaded part and an externally threaded element positionable in said hole.

7. The combination of claim 1, wherein said end portion of said rotor blade has a perimeter, said particular one of said openings being adapted to receive a constraint element engaging said end portion when said end portion is secured to said rotor hub comprising said particular one of said openings being adapted to receive a constraint element engaging said end portion along about 50% of said perimeter.

8. The combination of claim 1, wherein said end portion of said rotor blade has a perimeter, said particular one of said openings being adapted to receive a constraint element engaging said end portion when said end portion is secured to said rotor hub comprising said particular one of said openings being adapted to receive a constraint element engaging said end portion at at least three points of said perimeter, said at least three points being non-collinear.

9. The combination of claim 1, wherein said end portion of said rotor blade has a perimeter, said particular one of said openings being adapted to receive a constraint element engaging said end portion when said end portion is secured to said rotor hub comprising said particular one of said openings being adapted to receive a constraint element engaging said end portion at two segments of said perimeter, said two segments being non-contiguous.

10. The combination of claim 1, wherein said particular one of said openings extends between said first side surface and said second side surface, said particular one of said openings having a first section and a second section, said second section extending between said second side surface and said particular one of said cavities, said first section being aligned with said second section and extending to said first side surface.

11. The combination of claim 10, wherein said second section is a slot having a width and said first section is a pair of holes defining therebetween a distance substantially corresponding to said width of said slot.

12. The combination of claim 1, wherein said rotor hub is a single-piece rotor hub.

13. The combination of claim 1, wherein said particular one of said openings being adapted to receive a constraint element engaging said end portion when said end portion is secured to said rotor hub comprises said particular one of said openings being adapted to receive a U-shaped constraint element engaging said end portion when said end portion is secured to said rotor hub.

14. The combination of claim 1, further comprising a constraint element for positioning in said particular one of said openings and for engaging said end portion when said end portion is secured to said rotor hub.

15. The combination of claim 13, further comprising a U-shaped constraint element for positioning in said particular one of said openings and for engaging said end portion when said end portion is secured to said rotor hub.

16. The combination of claim 1, wherein said end portion of said rotor blade includes a groove, said groove being adapted to receive the constraint element, the constraint element engaging said end portion when said end portion is secured to said rotor hub comprising the constraint element engaging said groove.

17. The combination of claim 16, wherein said particular one of said cavities has an externally threaded part located therein and said end portion of said rotor blade has an internally threaded part complementary to said externally threaded part, said end portion being screwably securable to said rotor hub via said externally threaded part and said internally threaded part.

18. The combination of claim 17, wherein said externally threaded part is integral with said rotor hub.

19. The combination of claim 16, wherein said particular one of said cavities has an internally threaded part located therein and said end portion of said rotor blade has an externally threaded part complementary to said internally threaded part, said end portion being screwably securable to said rotor hub via said externally threaded part and said internally threaded part.

20. The combination of claim 19, wherein said externally threaded part is integral with said end portion of said rotor blade.

21. The combination of claim 16, wherein said rotor hub defines a hole extending inwardly from a bottom surface of said particular one of said cavities and said end portion of said rotor blade has an internally threaded part, said end portion being screwably securable to said rotor hub via said internally threaded part and an externally threaded element positionable in said hole.

22. The combination of claim 16, wherein said end portion of said rotor blade has a perimeter at said groove, said particular one of said openings being adapted to receive a constraint element engaging said end portion when said end portion is secured to said rotor hub comprising said particular one of said openings being adapted to receive a constraint element engaging said groove along about 50% of said perimeter at said groove.

23. The combination of claim 16, wherein said end portion of said rotor blade has a perimeter at said groove, said particular one of said openings being adapted to receive a constraint element engaging said end portion when said end portion is secured to said rotor hub comprising said particular one of said openings being adapted to receive a constraint element engaging said groove at at least three points of said perimeter at said groove, said at least three points being non-collinear.

24. The combination of claim 16, wherein said end portion of said rotor blade has a perimeter at said groove, said particular one of said openings being adapted to receive a constraint element engaging said end portion when said end portion is secured to said rotor hub comprising said particular one of said openings being adapted to receive a constraint element engaging said groove at two segments of said perimeter at said groove, said two segments being non-contiguous.

25. The combination of claim 16, wherein said particular one of said openings extends between said first side surface and said second side surface, said particular one of said openings having a first section and a second section, said second section extending between said second side surface and said particular one of said cavities, said first section being aligned with said second section and extending to said first side surface.

26. The combination of claim 25, wherein said second section is a slot having a width and said first section is a pair of holes defining therebetween a distance substantially corresponding to said width of said slot.

27. The combination of claim 16, wherein said rotor hub is a single-piece rotor hub.

28. The combination of claim 16, wherein said particular one of said openings being adapted to receive a constraint element engaging said end portion when said end portion is secured to said rotor hub comprises said particular one of said openings being adapted to receive a U-shaped constraint element engaging said end portion when said end portion is secured to said rotor hub.

29. The combination of claim 16, further comprising a constraint element for positioning in said particular one of said openings and said groove and for engaging said groove when said end portion is secured to said rotor hub.

30. The combination of claim 28, further comprising a U-shaped constraint element for positioning in said particular one of said openings and said groove and for engaging said groove when said end portion is secured to said rotor hub.

31. The combination of claim 16, wherein said groove extends circumferentially along a perimeter of said end portion.

32. A rotor for a turbomachine, said rotor comprising:

a hub including a peripheral surface, a first side surface, and a second side surface, said hub defining a plurality of cavities, each one of said cavities extending inwardly from said peripheral surface, said hub defining a plurality of openings, each one of said openings extending from a corresponding one of said cavities to at least one of said first side surface and said second side surface; and

a blade coupled to said hub, said blade including an end portion fitting in a particular one of said cavities and screwably secured to said hub, a particular one of said openings extending from said particular one of said cavities being adapted to receive a constraint element engaging said end portion.

33. A rotor as defined in claim 32, wherein said particular one of said cavities has an externally threaded part located therein and said end portion of said blade has an internally threaded part complementary to said externally threaded part, said end portion being screwably secured to said hub via said externally threaded part and said internally threaded part.

34. A rotor as defined in claim 33, wherein said externally threaded part is integral with said hub.

35. A rotor as defined in claim 32, wherein said particular one of said cavities has an internally threaded part located therein and said end portion of said blade has an externally threaded part complementary to said internally threaded part, said end portion being screwably secured to said hub via said externally threaded part and said internally threaded part.

36. A rotor as defined in claim 35, wherein said externally threaded part is integral with said end portion of said blade.

37. A rotor as defined in claim 32, wherein said hub defines a hole extending inwardly from a bottom surface of said particular one of said cavities and said end portion of said blade has an internally threaded part, said end portion being screwably secured to said hub via said internally threaded part and an externally threaded element positioned in said hole.

38. A rotor as defined in claim 32, wherein said end portion of said blade has a perimeter, said particular one of said openings being adapted to receive a constraint element engaging said end portion comprising said particular one of said openings being adapted to receive a constraint element engaging said end portion along about 50% of said perimeter.

39. A rotor as defined in claim 32, wherein said end portion of said blade has a perimeter, said particular one of said openings being adapted to receive a constraint element engaging said end portion comprising said particular one of said openings being adapted to receive a constraint element engaging said end portion at at least three points of said perimeter, said at least three points being non-collinear.

40. A rotor as defined in claim 32, wherein said end portion of said blade has a perimeter, said particular one of said openings being adapted to receive a constraint element engaging said end portion comprising said particular one of said openings being adapted to receive a constraint element engaging said end portion at two segments of said perimeter, said two segments being non-contiguous.

41. A rotor as defined in claim 32, wherein said particular one of said openings extends between said first side surface and said second side surface, said particular one of said openings having a first section and a second section, said second section extending between said second side surface and said particular one of said cavities, said first section being aligned with said second section and extending to said first side surface.

42. A rotor as defined in claim 41, wherein said second section is a slot having a width and said first section is a pair of holes defining therebetween a distance substantially corresponding to said width of said slot.

43. A rotor as defined in claim 32, wherein said hub is a single-piece hub.

44. A rotor as defined in claim 32, wherein said particular one of said openings being adapted to receive a constraint element engaging said end portion comprises said particular one of said openings being adapted to receive a U-shaped constraint element engaging said end portion.

45. A rotor as defined in claim 32, further comprising a constraint element received in said particular one of said openings and engaging said end portion.

46. A rotor as defined in claim 44, further comprising a U-shaped constraint element received in said particular one of said openings and engaging said end portion.

47. A rotor as defined in claim 32, wherein said end portion of said blade includes a groove, said groove being adapted to receive the constraint element, the constraint element engaging said end portion comprising the constraint element engaging said groove.

48. A rotor as defined in claim 47, wherein said particular one of said cavities has an externally threaded part located therein and said end portion of said blade has an internally threaded part complementary to said externally threaded part, said end portion being screwably secured to said hub via said externally threaded part and said internally threaded part.

49. A rotor as defined in claim 48, wherein said externally threaded part is integral with said hub.

50. A rotor as defined in claim 47, wherein said particular one of said cavities has an internally threaded part located therein and said end portion of said blade has an externally threaded part complementary to said internally threaded part, said end portion being screwably secured to said hub via said externally threaded part and said internally threaded part.

51. A rotor as defined in claim 50, wherein said externally threaded part is integral with said end portion of said blade.

52. A rotor as defined in claim 47, wherein said hub defines a hole extending inwardly from a bottom surface of said particular one of said cavities and said end portion of said blade has an internally threaded part, said end portion being screwably secured to said hub via said internally threaded part and an externally threaded element positioned in said hole.

53. A rotor as defined in claim 47, wherein said end portion of said blade has a perimeter at said groove, said particular one of said openings being adapted to receive a constraint element engaging said end portion comprising said particular one of said openings being adapted to receive a constraint element engaging said groove along about 50% of said perimeter at said groove.

54. A rotor as defined in claim 47, wherein said end portion of said blade has a perimeter at said groove, said particular one of said openings being adapted to receive a constraint element engaging said end portion comprising said particular one of said openings being adapted to receive a constraint element engaging said groove at at least three points of said perimeter at said groove, said at least three points being non-collinear.

55. A rotor as defined in claim 47, wherein said end portion of said blade has a perimeter at said groove, said particular one of said openings being adapted to receive a constraint element engaging said end portion comprising said particular one of said openings being adapted to receive a constraint element engaging said groove at two segments of said perimeter at said groove, said two segments being non-contiguous.

56. A rotor as defined in claim 47, wherein said particular one of said openings extends between said first side surface and said second side surface, said particular one of said openings having a first section and a second section, said second section extending between said second side surface and said particular one of said cavities, said first section being aligned with said second section and extending to said first side surface.

57. A rotor as defined in claim 56, wherein said second section is a slot having a width and said first section is a pair of holes defining therebetween a distance substantially corresponding to said width of said slot.

58. A rotor as defined in claim 47, wherein said hub is a single-piece hub.

59. A rotor as defined in claim 47, wherein said particular one of said openings being adapted to receive a constraint element engaging said end portion comprises said particular one of said openings being adapted to receive a U-shaped constraint element engaging said end portion.

60. A rotor as defined in claim 47, further comprising a constraint element received in said particular one of said openings and said groove and engaging said groove.

61. A rotor as defined in claim 59, further comprising a U-shaped constraint element received in said particular one of said openings and said groove and engaging said groove.

62. A rotor as defined in claim 47, wherein said groove extends circumferentially along a perimeter of said end portion.

63. An axial-flow fan comprising a rotor as defined in claim 32.

64. An axial-flow fan comprising a rotor as defined in claim 45.

65. An axial-flow fan comprising a rotor as defined in claim 46.

66. An axial-flow fan comprising a rotor as defined in claim 47.

67. An axial-flow fan comprising a rotor as defined in claim 60.

68. An axial-flow fan comprising a rotor as defined in claim 61.

69. A rotor for a turbomachine, said rotor comprising:

a hub including a peripheral surface, a first side surface, and a second side surface, said hub defining a plurality of cavities, each one of said cavities extending inwardly from said peripheral surface, said hub defining a plurality of openings, each one of said openings extending from a corresponding one of said cavities to at least one of said first side surface and said second side surface; and

a plurality of blades coupled to said hub, each one of said blades including an end portion, for each particular blade of said blades;

said end portion fitting in a respective one of said cavities and being screwably secured to said hub, a respective one of said openings extending from said respective one of said cavities being adapted to receive a constraint element engaging said end portion.

70. A rotor as defined in claim 69, wherein, for each particular blade of said blades, said respective one of said openings being adapted to receive a constraint element engaging said end portion comprises said respective one of said openings being adapted to receive a U-shaped constraint element engaging said end portion.

71. A rotor as defined in claim 69, further comprising, for each particular blade of said blades, a respective constraint element received in said respective one of said openings and engaging said end portion.

72. A rotor as defined in claim 70, further comprising, for each particular blade of said blades, a respective U-shaped constraint element received in said respective one of said openings and engaging said end portion.

73. A rotor as defined in claim 69, wherein said end portion of each one of said blades includes a groove, for each particular blade of said blades, said groove being adapted to receive the constraint element, the constraint element engaging said end portion comprising the constraint element engaging said groove.

74. A rotor as defined in claim 73, wherein, for each particular blade of said blades, said respective one of said openings being adapted to receive a constraint element engaging said end portion comprises said respective one of said openings being adapted to receive a U-shaped constraint element engaging said end portion.

75. A rotor as defined in claim 73, further comprising, for each particular blade of said blades, a respective constraint element received in said respective one of said openings and said groove and engaging said groove.

76. A rotor as defined in claim 74, further comprising, for each particular blade of said blades, a respective U-shaped constraint element received in said respective one of said openings and said groove and engaging said groove.

77. An axial-flow fan comprising a rotor as defined in claim 69.

78. An axial-flow fan comprising a rotor as defined in claim 71.

79. An axial-flow fan comprising a rotor as defined in claim 72.

80. An axial-flow fan comprising a rotor as defined in claim 73.

81. An axial-flow fan comprising a rotor as defined in claim 75.

82. An axial-flow fan comprising a rotor as defined in claim 76.