A rotary compressor having two different compression capacities is provided. The rotary compressor may include a driving shaft that is rotatable in both a clockwise and counterclockwise direction, and having an eccentric portion at an end thereof. The compressor may also include cylinder having a pr
A rotary compressor having two different compression capacities is provided. The rotary compressor may include a driving shaft that is rotatable in both a clockwise and counterclockwise direction, and having an eccentric portion at an end thereof. The compressor may also include cylinder having a predetermined inner volume, and a roller rotatably installed on an outer circumferential portion of the eccentric portion so as to contact an inner circumference of the cylinder and form a fluid chamber therebetween. A vane is elastically installed in the cylinder and contacts the roller, and upper and lower bearings are respectively installed at upper and lower portions of the cylinder so as to rotatably support the driving shaft and hermetically seal the inner volume of the cylinder. Suction and discharge ports communicate with the fluid chamber based on a rotational direction of the driving shaft so as to provide a different compression capacity depending on the rotational direction of the driving shaft.
대표청구항▼
The invention claimed is: 1. A rotary compressor having two different compression capacities in clockwise and counterclockwise rotational directions, comprising: a driving shaft that is rotatable in clockwise and counterclockwise directions, and having an eccentric portion of a predetermined size;
The invention claimed is: 1. A rotary compressor having two different compression capacities in clockwise and counterclockwise rotational directions, comprising: a driving shaft that is rotatable in clockwise and counterclockwise directions, and having an eccentric portion of a predetermined size; a cylinder having a predetermined inner volume; a roller rotatably coupled to an outer circumference of the eccentric portion of the driving shaft so as to contact an inner circumference of the cylinder, wherein the roller performs a rolling motion along the inner circumference of the cylinder and forms a fluid chamber to suction and compress fluid; a vane elastically installed in the cylinder to contact the roller; upper and lower bearings respectively installed at upper and lower portions of the cylinder, that rotatably support the driving shaft and hermetically seals an inner volume of the cylinder; a plurality of suction ports and a plurality of discharge ports that communicate with the fluid chamber so as to suction fluid into and discharge fluid from the fluid chamber; and a compression mechanism configured to form different sizes of compressive spaces in the fluid chamber based on the rotational direction of the driving shaft. 2. The rotary compressor of claim 1, wherein the compression mechanism compresses fluid using a full capacity of the fluid chamber when the driving shaft rotates in one of the clockwise direction or the counterclockwise direction. 3. The rotary compressor of claim 2, wherein the compression mechanism compresses fluid using a portion of the fluid chamber when the driving shaft rotates in the other of the clockwise direction or the counterclockwise direction. 4. The rotary compressor of claim 1, wherein the plurality of suction ports are configured to suck fluid in all rotational directions of the driving shaft. 5. The rotary compressor of claim 1, wherein the plurality of discharge ports are configured to discharge fluid introduced from a corresponding one of the plurality of suction ports and compressed while the driving shaft rotates clockwise or counterclockwise. 6. The rotary compressor of claim 1, wherein the plurality of suction ports are spaced apart by a predetermined angle from each other. 7. The rotary compressor of claim 1, wherein the plurality of discharge ports are spaced apart by a predetermined angle from each other. 8. The rotary compressor of claim 1, wherein of the plurality of suction ports and the plurality of discharge ports comprise at least two suction ports and at least two discharge ports. 9. The rotary compressor of claim 1, wherein the compression mechanism comprises a valve assembly, wherein the valve assembly rotates based on the rotational direction of the driving shaft to selectively open at least one of the plurality of suction ports. 10. The rotary compressor of claim 9, wherein the plurality of discharge ports comprises a first discharge port and a second discharge port which are positioned facing each other with respect to the vane. 11. The rotary compressor of claim 9, wherein the plurality of suction ports comprises a first suction port located in the vicinity of the vane and a second suction port spaced apart by a predetermined angle from the first suction port. 12. The rotary compressor of claim 11, wherein the first and second suction ports are circular. 13. The rotary compressor of claim 12, wherein the first and second suction ports have diameters in the range of 6 mm to 15 mm. 14. The rotary compressor of claim 11, wherein the first and second suction ports are rectangular. 15. The rotary compressor of claim 14, wherein the first and second suction ports have a predetermined curvature. 16. The rotary compressor of claim 11, wherein the first suction port is positioned approximately 10° from the vane in a clockwise or counterclockwise direction. 17. The rotary compressor of claim 11, wherein the second suction port is positioned in a range of 90-180° from the vane so as to face the first suction port. 18. The rotary compressor of claim 9, further comprising a plurality of discharge valves that selectively opens and closes respective discharge ports of the plurality of discharge ports so as to discharge compressed fluid therethrough. 19. The rotary compressor of claim 9, wherein the valve assembly comprises: a first valve rotatably installed between the cylinder and the lower bearing; and a second valve coupled to the first valve to guide a rotary motion of the first valve. 20. The rotary compressor of claim 19, wherein the first valve comprises a disc member that contacts the eccentric portion of the driving shaft and that rotates in the rotational direction of the driving shaft. 21. The rotary compressor of claim 20, wherein a diameter of the first valve is greater than an inner diameter of the cylinder. 22. The rotary compressor of claim 20, wherein the first valve is 0.5-5 mm thick. 23. The rotary compressor of claim 19, wherein the first valve comprises: a first opening in communication with the first suction port when the driving shaft rotates in one of the clockwise direction or the counterclockwise direction; and a second opening in communication with the second suction port when the driving shaft rotates in the other of the clockwise direction or the counterclockwise direction. 24. The rotary compressor of claim 23, wherein the plurality of suction ports further comprises a third suction port positioned between the second suction port and the vane. 25. The rotary compressor of claim 24, wherein the third suction port is spaced apart by 10° in a clockwise or counterclockwise direction from the vane so as to face the first suction port. 26. The rotary compressor of claim 24, wherein the first valve further comprises a third opening that opens the third suction port simultaneously with an opening of the second suction port. 27. The rotary compressor of claim 24, wherein the first valve comprises a first opening that opens the third suction port simultaneously with an opening of the second suction port. 28. The rotary compressor of claim 19, wherein the first valve comprises a single opening in communication with the first suction port when the driving shaft rotates in one of the clockwise direction or the counterclockwise direction, and in communication with the second suction port when the driving shaft rotates in the other of the clockwise direction or counterclockwise direction. 29. The rotary compressor of claim 19, wherein the valve assembly further comprises control apparatus that controls a rotation angle of the first valve such that corresponding suction ports of the plurality of suction ports are opened accurately. 30. The rotary compressor of claim 29, wherein the control apparatus comprises: a curved groove formed in the first valve and having a predetermined length; and a stopper formed on the lower bearing and inserted into the curved groove so as to restrict a rotation angle of the first valve. 31. The rotary compressor of claim 30, wherein the curved groove is positioned near a center of the first valve. 32. The rotary compressor of claim 30, wherein a thickness of the stopper is substantially the same as a thickness of the first valve. 33. The rotary compressor of claim 30, wherein a width of the stopper is substantially the same as a width of the curved groove. 34. The rotary compressor of claim 30, wherein opposite ends of the curved groove are positioned at an angle of 30-120°. 35. The rotary compressor of claim 29, wherein the control apparatus comprises: a projection that projects outward in a radial direction from the first valve; and a groove formed on the second valve, wherein the projection is movably received in the groove. 36. The rotary compressor of claim 29, wherein the control apparatus comprises: a projection that projects outward in a radial direction from the second valve; and a groove formed on the first valve, wherein the projection is movably received in the groove. 37. The rotary compressor of claim 29, wherein the control apparatus comprises: a projection formed that projects toward a center of the second valve; and a cut-away portion formed in the first valve so as to movably receive the projection. 38. The rotary compressor of claim 37, wherein the projection and the cut-away portion form a clearance therebetween, wherein the clearance forms an opening to the first suction port or the third suction port based on a rotational direction of the driving shaft. 39. The rotary compressor of claim 37, wherein the projection has an angle of 10-90° between opposite side surfaces thereof. 40. The rotary compressor of claim 37, wherein the cut-away portion has an angle of 30-120° between opposite ends thereof. 41. The rotary compressor of claim 1, wherein the compression mechanism comprises a valve assembly that selectively opens at least one of the plurality of suction ports using a pressure difference between inner and outer portions of the cylinder based on a rotational direction of the driving shaft. 42. The rotary compressor of claim 41, wherein the plurality of suction ports comprises a first suction port located in the vicinity of the vane and a second suction port spaced apart by a predetermined angle from the first suction port. 43. The rotary compressor of claim 41, wherein the compression mechanism comprises a valve assembly, wherein the valve assembly comprises: a first valve rotatably installed between the cylinder and the lower bearing; and a second valve that guides a rotary motion of the first valve. 44. The rotary compressor of claim 43, wherein the first and second valves are configured to open the second suction port in response to a negative inner pressure of the cylinder. 45. The rotary compressor of claim 44, wherein the first and second valves are check valves that allow only a flow of fluid into an inside of the cylinder. 46. The rotary compressor of claim 44, wherein the first and second valves are plate valves that are deformed so as to open a corresponding suction port in response to a pressure difference. 47. The rotary compressor of claim 46, wherein the first and second valves are deformed so as to open the suction port in a direction in which the negative pressure is generated. 48. The rotary compressor of claim 46, wherein a predetermined clearance is formed between the second valve and the second suction port. 49. The rotary compressor of claim 46, wherein the first and second valves further comprise a retainer to restrict deformation thereof. 50. The rotary compressor of claim 1, wherein the compression mechanism comprises a first vane and a second vane that divide the fluid chamber into a first space in which fluid is compressed while the driving shaft rotates bidirectionally, and a second space in which fluid is compressed while the driving shaft rotates in one direction. 51. The rotary compressor of claim 50, wherein the plurality of suction ports and the plurality of discharge ports supply or discharge the fluid into the first and second spaces selectively based on a rotational direction of the driving shaft. 52. The rotary compressor of claim 51, wherein the plurality of suction ports and the plurality of discharge ports are configured to suck fluid into the first space in all rotational directions of the driving shaft and to discharge compressed fluid from the first space. 53. The rotary compressor of claim 52, wherein the plurality of discharge ports are in communication with the first space, and comprise first and second discharge ports that discharge compressed fluid in each rotational direction of the driving shaft. 54. The rotary compressor of claim 1, wherein the compression mechanism comprises a plurality of different clearances formed between the roller and the inner circumference of the cylinder based on a rotational direction of the driving shaft. 55. The rotary compressor of claim 54, wherein the plurality of suction ports and the plurality of discharge ports comprise suction and discharge valves which are selectively opened or closed based on a rotational direction of the driving shaft. 56. The rotary compressor of claim 55, wherein the suction valves are configured to open the suction ports in response to a negative inner pressure of the cylinder. 57. The rotary compressor of claim 55, wherein the discharge valves are configured to open the discharge ports in response to a positive inner pressure of the cylinder. 58. The rotary compressor of claim 55, wherein the suction and discharge valves are check valves that allow only a flow of the fluid into an inside of the cylinder. 59. The rotary compressor of claim 55, wherein the suction and discharge valves are plate valves that are deformed so as to open the suction ports in response to a pressure difference. 60. The rotary compressor of claim 59, wherein the suction and discharge valves further comprise a retainer to restrict deformation thereof.
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이 특허에 인용된 특허 (3)
Tomayko Edward A. (Cuyler NY) Pandeya Prakash N. (Clay NY), Reversible fixed vane rotary compressor having a reversing disk which carries the suction port.
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