초록 ▼

The present invention discloses a miniature thermodynamic device that can be constructed using standard micro-fabrication techniques. The device can be used to provide cooling, generate power, compress gases, pump fluids and reduce pressure below ambient (operate as a vacuum pump). Embodiments of th

The present invention discloses a miniature thermodynamic device that can be constructed using standard micro-fabrication techniques. The device can be used to provide cooling, generate power, compress gases, pump fluids and reduce pressure below ambient (operate as a vacuum pump). Embodiments of the invention relating to the production of a cooling effect and the generation of electrical power, change the thermodynamic state of the system by extracting energy from a pressurized fluid. Energy extraction is attained using an expansion process, which is as nearly isentropic as possible for the appropriately chosen fluid. An isentropic expansion occurs when a compressed gas does work to expand, and in the disclosed embodiments, the gas does work by overcoming either an electrostatic or a magnetic force.

대표청구항 ▼

The present invention discloses a miniature thermodynamic device that can be constructed using standard micro-fabrication techniques. The device can be used to provide cooling, generate power, compress gases, pump fluids and reduce pressure below ambient (operate as a vacuum pump). Embodiments of th

The present invention discloses a miniature thermodynamic device that can be constructed using standard micro-fabrication techniques. The device can be used to provide cooling, generate power, compress gases, pump fluids and reduce pressure below ambient (operate as a vacuum pump). Embodiments of the invention relating to the production of a cooling effect and the generation of electrical power, change the thermodynamic state of the system by extracting energy from a pressurized fluid. Energy extraction is attained using an expansion process, which is as nearly isentropic as possible for the appropriately chosen fluid. An isentropic expansion occurs when a compressed gas does work to expand, and in the disclosed embodiments, the gas does work by overcoming either an electrostatic or a magnetic force. ls that is at least one less than the number of possible control positions. 9. A cutting device for agricultural harvesting machines according to claim 1 wherein the support and control member comprises at least two support rolls, one of the support rolls interacts with a backwards supporting edge of the corresponding cutting blade in a control position for providing elastic support to the cutting blades in the cutting position. 10. A cutting device for agricultural harvesting machines according to claim 1 wherein the support and control members of adjacent cutting blades are staggered in relation to each other by at least one angular pitch. 11. A cutting device for agricultural harvesting machines according to claim 1, wherein the energy accumulator is designed as a torsion spring. 12. A cutting device for agricultural harvesting machines according to claim 1 wherein, in a base position, the support and control members rest against a stop element on the control shaft. 13. A cutting device for agricultural harvesting machines according to claim 1 wherein the support and control member comprises a roughly triangular carrier segment and has a hub for mounting to the control shaft. 14. A cutting device for agricultural harvesting machines according to claim 13 wherein the carrier segment has the shape of an isosceles triangle with rounded corners. 15. A cutting device for agricultural harvesting machines according to claim 8, wherein one support roll is mounted in rotatable fashion in the area of the angle between the base side and one lateral side. 16. A cutting device for agricultural harvesting machines according to claim 15, wherein the support and control member comprises a roughly triangular carrier segment and has a hub for mounting to the control shaft and the hub of the support and control member is mounted in the area of the angle between the two lateral sides. 17. A cutting device for agricultural harvesting machines according to claim 1, wherein a separate energy accumulator is assigned to each individual support and control member. 18. A cutting device for agricultural harvesting machines; comprising: a conveyor channel through which cut agricultural material passes; rotatable cutting blades each arranged to move between a cutting position in which said cutting blade is arranged in said conveyor channel and a non-cutting position in which said cutting blade is not situated in said conveyor channel, agricultural material being moved in said conveyor channel into contact with said cutting blades when said cutting blades are in the cutting position; support and control members each providing elastic support to a respective one of said cutting blades when said cutting blade is in the cutting position and enabling movement of said cutting blade from the cutting position to the non-cutting position such that some or all of said cutting blades are movable from the cutting position to the non-cutting position; a control shaft, said support and control members being rotatably mounted to said control shaft; and connecting means for elastically connecting each of said support and control members to said control shaft. 19. A cutting device for agricultural harvesting machines according to claim 18, wherein each of said support and control members is rotatable and aligned about an axis parallel to a rotation axis of the respective one of said cutting blades. 20. A cutting device for agricultural harvesting machines according to claim 18, wherein said cutting blades are arranged in a single row. 21. A cutting device for agricultural harvesting machines according to claim 18, wherein said cutting blades are situated below said conveyor channel when in the non-cutting position. 22. A cutting device for agricultural harvesting machines according to claim 18, further comprising conveying means for conveying agricultural material in said conveyor channel into contact with said cutting blades when said cutting blades are in the cutting position. 23. A cutting device for agricultural harvesting machines according to claim 22, wherein said conveying means comprise a conveyor mechanism having prongs. 24. A cutting device for agricultural harvesting machines according to claim 18, wherein each of said support and control members is rotatable about an axis and structured and arranged to enable at least three control positions of the respective one of said cutting blades to be set in one rotation of said support and control member about the axis. 25. A cutting device for agricultural harvesting machines according to claim 24, wherein each of the at least three control positions is obtainable by rotation of said support and control member one angular pitch at a time. 26. A cutting device for agricultural harvesting machines according to claim 25, wherein the angular pitch between the at least three control positions is 120 degrees. 27. A cutting device for agricultural harvesting machines according to claim 24, wherein each of said support and control members is structured and arranged to enable an intermediate position located between the respective control positions to be set in one rotation of said support and control member about the axis. 28. A cutting device for agricultural harvesting machines according to claim 27, wherein when said control and support member is in the intermediate position, the respective one of said cutting blades is rotatable from the cutting position to the non-cutting position. 29. A cutting device for agricultural harvesting machines according to claim 18, wherein each of said support and control members is rotatable about an axis and structured and arranged to enable at least two control positions of the respective one of said cutting blades to be set in which said support and control member provides elastic support with said cutting blade being in the cutting position and enable one control position to be set in which the respective one of said cutting blades is able to rotate out of the cutting position into the non-cutting position. 30. A cutting device for agricultural harvesting machines according to claim 18, wherein each of said support and control members is rotatable about an axis and structured and arranged to enable a plurality of control positions of the respective one of said cutting blades to be set upon rotation of said support and control member about the axis. 31. A cutting device for agricultural harvesting machines according to claim 30, wherein each of said support and control members includes a number of support rolls which is at least one less than the number of control positions, each of said support rolls being arranged to interact with a rear supporting edge of the respective one of said cutting blades to thereby provide elastic support to the respective one of said cutting blades when said cutting blade is in the cutting position. 32. A cutting device for agricultural harvesting machines according to claim 30, wherein at least one of said support and control members includes at least two support rolls, one of said support rolls interacting with a rear supporting edge of the respective one of said cutting blades in one of the control positions in which said support and control member provides elastic support to the respective one of said cutting blades when said cutting blade is in the cutting position. 33. A cutting device for agricultural harvesting machines according to claim 18, wherein said support and control members of adjacent ones of said cutting blades are staggered in relation to each other by at least one angular pitch. 34. A cutting device for agricultural harvesting machines according to claim 18, wherein at least one of said connecting means comprises a torsion spring. 35. A cutting device for agricultural harvesting machines according to claim 18, further comprising a stop element arranged on said control shaft and against which said support and control members rest in a base position . 36. A cutting device for agricultural harvesting machines according to claim 18, wherein at least one of said support and control members comprises a substantially triangular carrier segment and includes a hub for mounting said carrier segment to said control shaft. 37. A cutting device for agricultural harvesting machines according to claim 36, wherein said carrier segment has a shape of an isosceles triangle with rounded corners. 38. A cutting device for agricultural harvesting machines according to claim 36, wherein said at least one of said support and control members comprises a support roll rotatably mounted in an area of an angle between a base side and a lateral side of said carrier segment. 39. A cutting device for agricultural harvesting machines according to claim 36, wherein said hub is mounted in an area of an angle between two lateral sides of said carrier segment. 40. A cutting device for agricultural harvesting machines according to claim 18, wherein at least one of said support and control members comprises a carrier segment and a support roll rotatably mounted to said carrier segment. 41. A cutting device for agricultural harvesting machines according to claim 40, wherein said at least one support and control member further comprises a stud bolt connected to said carrier segment and a bearing bush interposed between said support roll and said stud bolt. 42. A cutting device for agricultural harvesting machines according to claim 18, further comprising a control drive coupled to said control shaft for changing a position of said control shaft and thus the cutting position of said cutting blades. 43. A cutting device for agricultural harvesting machines according to claim 42, wherein said control device comprises a control lever coupled to said control shaft, a tension spring connected to one end of said control lever and a expandable piston connected to an opposite end of said control lever. 44. A cutting device for agricultural harvesting machines, comprising: a conveyor channel through which cut agricultural material passes; cutting blades each arranged to move between a cutting position in which said cutting blade is arranged in said conveyor channel and a non-cutting position in which said cutting blade is not situated in said conveyor channel; support and control means for providing elastic support to each of said cutting blades when said cutting blade is in the cutting position and enabling movement of said cutting blade from the cutting position to the non-cutting position such that some or all of said cutting blades are movable from the cutting position to the non-cutting position; a control shaft, said support and control means being rotatably mounted to said control shaft; and connecting means for elastically connecting each of said support and control means to said control shaft. 45. A cutting device for agricultural harvesting machines according to claim 44, wherein said support and control means each comprise a rotatable support and control member aligned about an axis parallel to a rotation axis of the respective one of said cutting blades. 46. A cutting device for agricultural harvesting machines according to claim 45, wherein each of said support and control members is rotatable about an axis and structured and arranged to enable at least three control positions of the respective one of said cutting blades to be set in one rotation of said support and control member about the axis. 47. A cutting device for agricultural harvesting machines according to claim 46, wherein each of said support and control members includes a number of support rolls which is at least one less than the number of control positions, each of said support rolls being arranged to interact with a rear supporting edge of the respective one of said cutting blades to thereby provide elastic support to the respective one of said cutting blades when said cutting blade is in the cutting position. 48. A cutting device f