A rotary fluid-displacement assembly having a housing and a rotor positioned within an internal cavity of the housing. The rotor being configured to rotate about a rotor axis of rotation eccentric to a housing longitudinal axis. A gate is also provided that is slidably mounted therewith the rotor an
A rotary fluid-displacement assembly having a housing and a rotor positioned within an internal cavity of the housing. The rotor being configured to rotate about a rotor axis of rotation eccentric to a housing longitudinal axis. A gate is also provided that is slidably mounted therewith the rotor and movable axially about and between a first position, in which a distal end of the gate is positioned at a first distance from the peripheral surface of the rotor, and a second position, in which the distal end of the gate is positioned at a second distance from the peripheral surface of the rotor. The distal end of the gate being constrained to be spaced proximate from the inner wall surface of the housing as the rotor rotates about the rotor axis of rotation.
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1. A rotary fluid-displacement assembly, comprising: a housing defining an internal cavity having an inner wall surface, wherein the housing has a housing longitudinal axis extending transverse to a housing plane that bisects the inner wall surface;a rotor having a peripheral surface and being posit
1. A rotary fluid-displacement assembly, comprising: a housing defining an internal cavity having an inner wall surface, wherein the housing has a housing longitudinal axis extending transverse to a housing plane that bisects the inner wall surface;a rotor having a peripheral surface and being positioned within the internal cavity of the housing, the rotor configured to rotate about a rotor axis of rotation eccentric to the housing longitudinal axis; anda gate having a distal end, the gate being slidably mounted therewith the rotor and movable axially about and between a first position, in which the distal end of the gate is positioned at a first distance from the peripheral surface of the rotor, and a second position, in which the distal end of the gate is positioned at a second distance from the peripheral surface of the rotor, wherein the distal end of the gate is constrained to be spaced proximate from the inner wall surface of the housing as the rotor rotates about the rotor axis of rotation, wherein at least portions of the peripheral surface of the rotor, portions of the inner wall surface, and varying portions of the gate proximate the distal end of the gate define a fluid chamber of varying volume as the rotor rotates about the rotor axis of rotation, and wherein the gate has at least one inlet port in fluid communication with the fluid chamber. 2. The rotary fluid-displacement assembly of claim 1, wherein the rotor has at least one inlet port in fluid communication with the fluid chamber. 3. The rotary fluid-displacement assembly of claim 1, further comprising means for selectively opening and closing the at least one inlet port therein the gate. 4. The rotary fluid-displacement assembly of claim 1, wherein the housing has at least one inlet port in fluid communication with the fluid chamber. 5. The rotary fluid-displacement assembly of claim 1, wherein the rotor has a first side surface and an opposed second side surface, and wherein the rotor further comprises a pair of end plates that are mounted to and rotate therewith the respective first and second side surfaces of the rotor. 6. The rotary fluid-displacement assembly of claim 5, wherein at least one of the pair of end plates defines an inlet port in fluid communication with the fluid chamber. 7. The rotary fluid-displacement assembly of claim 5, wherein at least one of the pair of end plates defines an outlet port in fluid communication with the fluid chamber. 8. The rotary fluid-displacement assembly of claim 5, wherein the housing has a front surface and an opposed back surface, wherein portions of a first end plate of the pair of end plates sealingly and slidably contacts portions of the front surface of the housing; and wherein portions of a second end plate plates sealingly and slidably contacts portions of the back surface of the housing. 9. The rotary fluid-displacement assembly of claim 8, further comprising means for providing a substantially fluid-impervious seal between the first end plate and the front surface of the housing and between the second end plate and the back surface of the housing. 10. The rotary fluid-displacement assembly of claim 9, wherein the means for providing a substantially fluid-impervious seal comprises: at least one slot defined in each of the front and back surfaces of the housing that substantially surrounds the interior cavity of the housing; anda plurality of seals, each seal being configured for complementary mounting therein one slot of the housing. 11. The rotary fluid-displacement assembly of claim 1, wherein the first distance is greater than the second distance. 12. The rotary fluid-displacement assembly of claim 1, wherein the second distance is proximal to the peripheral surface of the rotor. 13. The rotary fluid-displacement assembly of claim 1, wherein, in the second position, the distal end of the gate is at or below the peripheral surface of the rotor. 14. The rotary fluid-displacement assembly of claim 1, wherein the housing has at least one outlet port in fluid communication with the fluid chamber. 15. The rotary fluid-displacement assembly of claim 1, wherein the gate has at least one outlet port in fluid communication with the fluid chamber. 16. The rotary fluid-displacement assembly of claim 15, further comprising means for selectively opening and closing the at least one outlet port therein the gate. 17. The rotary fluid-displacement assembly of claim 1, wherein the rotor has at least one outlet port in fluid communication with the fluid chamber. 18. The rotary fluid-displacement assembly of claim 1, further comprising a cam positioned therein the internal cavity about a cam axis and configured to selectively engage portions of the gate to effect the axial movement of the gate about and between the respective first and second positions. 19. The rotary fluid-displacement assembly of claim 18, wherein the rotor is configured to act on select portions of the gate to effect the constrained axial movement of the gate relative to the peripheral surface of the rotor. 20. The rotary fluid-displacement assembly of claim 18, wherein the rotor defines a bore configured for slidable receipt of the gate. 21. The rotary fluid-displacement assembly of claim 20, wherein the gate defines a hollow having at least one bearing surface that is configured for selective contact with portions of the cam. 22. The rotary fluid-displacement assembly of claim 21, wherein the at least one bearing surface comprises a pair of opposed bearing surfaces. 23. The rotary fluid-displacement assembly of claim 21, wherein the rotor defines a centrally positioned chamber configured for rotative receipt of the cam. 24. The rotary fluid-displacement assembly of claim 23, wherein the bore has a bore axis that bisects a center of the chamber, and wherein the pair of opposed bearing surfaces of the gate are positioned substantially transverse to the bore axis. 25. The rotary fluid-displacement assembly of claim 24, wherein the pair of opposed bearing surfaces are spaced from each other along a longitudinal axis of the gate and are positioned opposite each other about the cam axis. 26. The rotary fluid-displacement assembly of claim 21, wherein at least a portion of at least one bearing surface is curved. 27. The rotary fluid-displacement assembly of claim 20, further comprising means for minimizing distortion and deflection of the gate at high fluid pressures. 28. The rotary fluid-displacement assembly of claim 27, wherein at least a portion of the bore of the rotor has a cylindrical cross-sectional shape, and wherein at least portions of the gate have a cylindrical cross-sectional shape that is complementary to the bore of the rotor. 29. The rotary fluid-displacement assembly of claim 28, further comprising at least one sealing element mounted thereon exterior portions of the at least portions of the gate having the cylindrical cross-sectional shape. 30. The rotary fluid-displacement assembly of claim 1, wherein the distal end of the gate is constrained to be spaced proximate from the inner wall surface of the housing in a constrained range of between about 0.0001 inches to about 0.2000 inches. 31. The rotary fluid-displacement assembly of claim 1, wherein the distal end of the gate is constrained to be spaced proximate from the inner wall surface of the housing in a constrained range of between about 0.0003 inches to about 0.1500 inches. 32. The rotary fluid-displacement assembly of claim 1, wherein the distal end of the gate is constrained to be spaced proximate from the inner wall surface of the housing in a constrained range of between about 0.0005 inches to about 0.1000 inches. 33. The rotary fluid-displacement assembly of claim 1, wherein the distal end of the gate is constrained to be spaced proximate from the inner wall surface of the housing in a constrained range of between 0.01% and 15.0% of the diameter of the housing inner surface. 34. The rotary fluid-displacement assembly of claim 1, wherein the distal end of the gate defines a slot, and further comprising a seal assembly comprising at least one planar member movable therein the slot of the gate. 35. The rotary fluid-displacement assembly of claim 34, wherein the seal assembly further comprises a bias element configured to selectively act on the at least one planar member to maintain the outer edge of the at least one planar member in sliding contact with the inner wall surface of the housing as the rotor rotates. 36. The rotary fluid-displacement assembly of claim 34, wherein the seal assembly further comprises a means for applying a biasing force acting upon the at least one planar member to maintain the outer edge of the at least one planar member in sliding contact with the inner wall surface of the housing as the rotor rotates. 37. The rotary fluid-displacement assembly of claim 34, wherein the mass of the at least one planar member is less than about 50 percent of the mass of the gate. 38. The rotary fluid-displacement assembly of claim 34, wherein the mass of the at least one planar member is less than about 10 percent of the mass of the gate. 39. The rotary fluid-displacement assembly of claim 34, wherein the mass of the at least one planar member is less than about 2 percent of the mass of the gate. 40. The rotary fluid-displacement assembly of claim 34, wherein the mass of the at least one planar member is between about 1 to about 60 percent of the mass of the gate. 41. The rotary fluid-displacement assembly of claim 1, further comprising a seal element extending outwardly from the inner wall surface of the housing proximate the location of minimal running clearance between the inner wall surface of the housing and the peripheral surface of the rotor, wherein an edge of the seal element is configured for selective slidable contact with the peripheral surface of the rotor. 42. The rotary fluid-displacement assembly of claim 41, further comprising means for withdrawing the seal element within the housing such that the edge of the seal element is at or below the inner wall surface of the housing when the distal end of the gate passes over the seal element as the rotor rotates. 43. The rotary fluid-displacement assembly of claim 1, wherein the gate has an opposed proximal end, and wherein, in the first position, the proximal end of the gate is positioned at substantially the second distance from the peripheral surface of the rotor and in the second position, the proximal end of the gate is positioned at substantially the first distance from the peripheral surface of the rotor. 44. The rotary fluid-displacement assembly of claim 43, wherein the proximal end of the gate is constrained to be spaced proximate from the inner wall surface of the housing as the rotor rotates about the rotor axis of rotation. 45. The rotary fluid-displacement assembly of claim 44, wherein at least portions of the peripheral surface of the rotor, portions of the inner wall surface, and varying portions of the gate proximate the distal end of the gate define a first fluid chamber of varying volume as the rotor rotates about the rotor axis of rotation, and wherein at least portions of the peripheral surface of the rotor, portions of the inner wall surface, and varying portions of the gate proximate the proximal end of the gate define a second fluid chamber of varying volume as the rotor rotates about the rotor axis of rotation. 46. The rotary fluid-displacement assembly of claim 45, wherein the distal end of the gate defines at least one inlet port in fluid communication with the first fluid chamber, and wherein the proximal end of the gate defines at least one inlet port in fluid communication with the second fluid chamber. 47. The rotary fluid-displacement assembly of claim 46, further comprising means for selectively opening and closing the at least one inlet port therein the respective distal and proximal ends of the gate. 48. The rotary fluid-displacement assembly of claim 46, wherein the housing has at least one inlet port in fluid communication with the respective first and second fluid chambers. 49. A rotary fluid-displacement assembly, comprising: a housing defining an internal cavity having an inner wall surface, wherein the housing has a housing longitudinal axis extending transverse to a housing plane that bisects the inner wall surface;a rotor having a peripheral surface and being positioned within the internal cavity of the housing, the rotor configured to rotate about a rotor axis of rotation eccentric to the housing longitudinal axis;a gate having a distal end, the gate being slidably mounted therewith the rotor and movable axially; andmeans for constraining the axial movement of the gate such that the distal end of the gate is constrained to be spaced proximate from the inner wall surface of the housing as the rotor rotates about the rotor axis of rotation;wherein at least portions of the peripheral surface of the rotor, portions of the inner wall surface, and varying portions of the gate proximate the distal end of the gate define a fluid chamber of varying volume as the rotor rotates about the rotor axis of rotation. 50. A rotary fluid-displacement assembly, comprising: a housing defining an internal cavity having an inner wall surface, wherein the housing has a housing longitudinal axis extending transverse to a housing plane bisecting the inner wall surface;a rotor having a peripheral surface and defining a bore having a bore axis that extends therein the peripheral surface of the rotor, the rotor being positioned within the internal cavity of the housing and configured to rotate about a rotor axis of rotation eccentric to the housing longitudinal axis;a gate having a distal end, the gate being slidably mounted therein the bore of the rotor and constrained for movement axially along the bore axis about and between a first extended position and a second retracted position, wherein the distal end of the gate is constrained to be spaced proximate from the inner wall surface of the housing as the rotor rotates about the rotor axis of rotation; anda cam positioned therein the internal cavity of the housing about a cam axis and configured to selectively engage portions of the gate to effect the axial movement of the gate about and between the respective first and second positions,wherein the gate defines a hollow having at least one bearing surface that is configured for selective contact with portions of the cam, and wherein the distal end of the gate is constrained to be spaced proximate from the inner wall surface of the housing in a constrained range of between about 0.0001 inches to about 0.2000 inches. 51. The rotary fluid-displacement assembly of claim 50, wherein the rotor defines a centrally positioned chamber configured for rotative receipt of the cam, and wherein the bore axis bisects a center of the chamber. 52. The rotary fluid-displacement assembly of claim 51, wherein the at least one bearing surface comprises a pair of opposed bearing surfaces, and wherein the pair of opposed bearing surfaces are spaced from each other along a longitudinal axis of the gate and are positioned opposite each other about the cam axis. 53. The rotary fluid-displacement assembly of claim 52, wherein at least portions of the peripheral surface of the rotor, portions of the inner wall surface, and varying portions of the gate proximate the distal end of the gate define a fluid chamber of varying volume as the rotor rotates about the rotor axis of rotation. 54. The rotary fluid-displacement assembly of claim 53, wherein the rotor is configured to act on select portions of the gate to effect the constrained axial movement of the gate relative to the peripheral surface of the rotor. 55. The rotary fluid-displacement assembly of claim 53, wherein the distal end of the gate is constrained to be spaced proximate from the inner wall surface of the housing in a constrained range of between about 0.0003 inches to about 0.1500 inches. 56. The rotary fluid-displacement assembly of claim 53, wherein the distal end of the gate is constrained to be spaced proximate from the inner wall surface of the housing in a constrained range of between about 0.0005 inches to about 0.1000 inches. 57. The rotary fluid-displacement assembly of claim 53, wherein the distal end of the gate is constrained to be spaced proximate from the inner wall surface of the housing in a constrained range of between 0.01% and 15.0% of the diameter of the housing inner surface. 58. The rotary fluid-displacement assembly of claim 53, wherein the distal end of the gate defines a slot, and further comprising a seal assembly comprising at least one planar member movable therein the slot of the gate. 59. The rotary fluid-displacement assembly of claim 58, wherein the seal assembly further comprises a bias element configured to selectively act on the at least one planar member to maintain the outer edge of the at least one planar member in sliding contact with the inner wall surface of the housing as the rotor rotates. 60. The rotary fluid-displacement assembly of claim 58, wherein the seal assembly further comprises a means for applying a biasing force acting upon the at least one planar member to maintain the outer edge of the at least one planar member in sliding contact with the inner wall surface of the housing as the rotor rotates. 61. The rotary fluid-displacement assembly of claim 58, wherein the mass of the at least one planar member is less than about 10 percent of the mass of the gate. 62. The rotary fluid-displacement assembly of claim 58, wherein the mass of the at least one planar member is less than about 2 percent of the mass of the gate. 63. The rotary fluid-displacement assembly of claim 58, wherein the mass of the at least one planar member is between about 1 to about 60 percent of the mass of the gate. 64. The rotary fluid-displacement assembly of claim 53, wherein the rotor has a first side surface and an opposed second side surface, further comprising a pair of end plates that are mounted to and rotate therewith the respective first and second side surfaces of the rotor. 65. The rotary fluid-displacement assembly of claim 64, wherein the housing has a front surface and an opposed back surface, wherein portions of a first end plate of the pair of end plates sealingly and slidably contact portions of the front surface of the housing, and wherein portions of a second end plate of the pair of end plates sealingly and slidably contact portions of the back surface of the housing. 66. The rotary fluid-displacement assembly of claim 65, further comprising means for providing a substantially fluid-impervious seal between the first end plate and the front surface of the housing and between the second end plate and the back surface of the housing. 67. The rotary fluid-displacement assembly of claim 53, further comprising a seal element extending outwardly from the inner wall surface of the housing proximate the location of minimal running clearance between the inner wall surface of the housing and the peripheral surface of the rotor, wherein an edge of the seal element is configured for selective slidable contact with the peripheral surface of the rotor. 68. The rotary fluid-displacement assembly of claim 67, further comprising means for withdrawing the seal element within the housing such that the edge of the seal element is at or below the inner wall surface of the housing when the distal end of the gate passes over the seal element as the rotor rotates. 69. The rotary fluid-displacement assembly of claim 68, wherein the seal element is positioned at an angle with respect to the housing plane. 70. The rotary fluid-displacement assembly of claim 53, wherein the bore of the rotor has a cylindrical cross-sectional shape, and wherein at least portions of the gate have a cylindrical cross-sectional shape that is complementary to the bore of the rotor. 71. A rotary fluid-displacement assembly, comprising: a housing defining an internal cavity having an inner wall surface, wherein the housing has a housing longitudinal axis extending transverse to a housing plane that bisects the inner wall surface;a rotor having a peripheral surface and being positioned within the internal cavity of the housing, the rotor configured to rotate about a rotor axis of rotation eccentric to the housing longitudinal axis;a gate having a distal end, the gate being slidably mounted therewith the rotor and movable axially; andmeans for constraining the axial movement of the gate such that the distal end of the gate is constrained to be spaced proximate from the inner wall surface of the housing as the rotor rotates about the rotor axis of rotation in a constrained range of between 0.01% and 15.0% of the diameter of the housing inner surface,wherein at least portions of the peripheral surface of the rotor, portions of the inner wall surface of the housing, and varying portions of the gate proximate the distal end of the gate define a fluid chamber of varying volume as the rotor rotates about the rotor axis of rotation.
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