A variable capacity rotary compressor includes a hermetic casing, a housing installed in the hermetic casing to define therein first and second compression chambers having different capacities, and a compressing unit placed in the first and second compression chambers and operated to execute a compr
A variable capacity rotary compressor includes a hermetic casing, a housing installed in the hermetic casing to define therein first and second compression chambers having different capacities, and a compressing unit placed in the first and second compression chambers and operated to execute a compression operation in either the first or second compression chamber according to a rotating direction of a rotating shaft which drives the compressing unit. The compressor further includes a suction path controller, a high-pressure pipe, and a high-pressure path controller. The suction path controller controls a refrigerant suction path so that a refrigerant is delivered into an inlet port of the first or second compression chamber where the compression operation is executed. The high-pressure pipe couples an outlet side of the compressor to the suction path controller. The high-pressure path controller is provided at a predetermined portion of the suction path controller, and controls a high-pressure path so that the high-pressure pipe communicates with the inlet port of the first or second compression chamber where an idle operation is executed, according to variance of temperature when the refrigerant suction path is controlled by the suction path controller.
대표청구항▼
What is claimed is: 1. A variable capacity rotary compressor, including a hermetic casing, a housing installed in the hermetic casing to define therein first and second compression chambers having different capacities, and a compressing unit placed in the first and second compression chambers, and
What is claimed is: 1. A variable capacity rotary compressor, including a hermetic casing, a housing installed in the hermetic casing to define therein first and second compression chambers having different capacities, and a compressing unit placed in the first and second compression chambers, and operated to execute a compression operation in either the first or second compression chamber according to a rotating direction of a rotating shaft which drives the compressing unit, the variable capacity rotary compressor comprising: a suction path controller to control a refrigerant suction path so that a refrigerant is delivered into an inlet of the first or second compression chamber where the compression operation is executed; a high-pressure pipe to couple an outlet side of the compressor to the suction path controller; and a high-pressure path controller provided at a predetermined portion of the suction path controller, the high-pressure path controller controlling a high-pressure path so that the high-pressure pipe communicates with the inlet of the first or second compression chamber where an idle operation is executed, according to variance of temperature when the refrigerant suction path is controlled by the suction path controller. 2. The variable capacity rotary compressor according to claim 1, wherein the suction path controller comprises: a hollow body; an inlet connected to a refrigerant inlet pipe; and first and second outlets formed on the hollow body at opposite ends of the hollow body to be spaced apart from the inlet of the hollow body, the first and second outlets being respectively connected to the corresponding inlets of the first and second compression chambers; a valve seat provided in the hollow body to communicate with the inlet of the hollow body of the suction path controller; and first and second valves provided at both sides in the hollow body to axially reciprocate in the hollow body to open either of opposite ends of the valve seat, the first and second valves being connected to each other by a connection rod. 3. The variable capacity rotary compressor according to claim 2, wherein the high-pressure pipe comprises first and second pipe parts which are respectively connected to opposite ends of the hollow body to communicate with the opposite ends of the hollow body. 4. The variable capacity rotary compressor according to claim 3, wherein the high-pressure path controller comprises first and second bimetal valves which are respectively mounted to outlets of the first and second pipes, the first or second bimetal valve opening the outlet of the first or second pipe which has a higher temperature, when the refrigerant suction path is changed by a reciprocating motion of the first and second valves. 5. The variable capacity rotary compressor according to claim 4, wherein each of the first and second bimetal valves comprises: first and second metal plates having different thermal strains, a dome-shaped valve controller to open the high-pressure path at respective centers thereof; and saw teeth on respective circumferences thereof to allow a flow of the refrigerant. 6. The variable capacity rotary compressor according to claim 4, further comprising: first and second plugs respectively provided on the opposite ends of the hollow body to close the opposite ends of the hollow body, the first pipe being connected to the first plug and the second pipe being connected to the second plug, wherein the first and second bimetal valves are respectively housed in the high-pressure path defined in each of the first and second plugs. 7. The variable capacity rotary compressor according to claim 6, wherein each of the first and second bimetal valves comprises: first and second metal plates to have different thermal strains; a dome-shaped valve control part to open the high-pressure path at respective centers thereof; and saw teeth on respective circumferences thereof to allow a flow of the refrigerant. 8. The variable capacity rotary compressor according to claim 2, wherein each of the first and second valves comprises: a thin valve plate to come into contact with the valve seat; and a support member to support the thin valve plate. 9. A compressor, including compression chambers, having inlets and outlets on an inlet and outlet side, respectively, to execute compression and idle operations, to allow an internal pressure of the compression chambers, when executing the idle operation, to be equal to a pressure of the outlet side of the compressor, comprising: a suction path controller, including a refrigerant suction path, to deliver a refrigerant to the inlet of the compression chamber where the compression operation is executed; a high pressure pipe coupled to an outlet side of the compressor to the suction path controller; and a high pressure controller to control the suction path controller to communicate with the inlets of the compression chambers according to a variance of temperature when the refrigerant suction path is controlled by the suction path controller. 10. The compressor according to claim 9, wherein the suction path controller comprises: a cylindrical hollow body having open opposite ends; and first and second plugs to close the open opposite ends of the hollow body. 11. The compressor according to claim 10, wherein the suction path controller comprises an inlet at a control portion of the hollow body to supply refrigerant to the suction path controller. 12. The compressor according to claim 11, wherein the suction path controller further comprises: first and second outlets, which are separated from one another, on the body and opposite to the inlet; and pipes, connected to the inlets of the compression chambers, are connected to the first and second outlets of the suction path controller, respectively. 13. The compressor according to claim 12, wherein the suction path controller comprises: a cylindrical valve seat, which is opened at opposite ends thereof, to be provided in the hollow body; first and second valves to reciprocate into and out of the open opposite ends of the body to open and close the open opposite ends of the cylindrical valve seat to change the refrigerant suction path; and a rod to integrally connect the first and second valves. 14. The compressor according to claim 9, further comprising a hermetic casing around the compressor, wherein a pressure of an outlet side of the compressor acts on the inlet of the compression chamber where the idle operation is executed to allow an internal pressure of the compression chamber to be equal to an internal pressure of the hermetic casing. 15. The compressor according to claim 13, wherein the high pressure pipe comprises: a connection pipe to receive refrigerant from the compressor; first and second pipes, branching from the connection pipe, having outlets to connect to the first and second plugs of the hollow body, respectively. 16. The compressor according to claim 15, wherein the high pressure controller comprises first and second bimetal valves, housed in the first and second plugs, respectively, to open the outlet of the first pipe and the outlet of the second pipe, respectively. 17. The compressor according to claim 16, wherein the first and second bimetal valves each comprise first and second metal plates having different thermal strains. 18. The compressor according to claim 17, wherein in the first and second bimetal valves, the first metal plates have higher thermal strains than the second metal plates and are placed at positions adjacent to the outlets of the first and second pipes, respectively, while the second metal plates are placed at positions opposite to the first metal plates. 19. The compressor according to claim 18, the first and second bimetal valve each comprise: a dome at centers thereof to allow the high pressure path to open and close; and substantially saw shaped teeth on circumferences thereof to allow a flow of refrigerant therethrough. 20. The compressor according to claim 19, wherein when a temperature around each of the first and second bimetal valves rises, the first metal plates extend further than the second metal plates, and when a temperature around each of the first and second bimetal valves falls, the first metal plates contract further than the second metal plates. 21. The compressor according to claim 20, wherein when refrigerant is delivered in to either the first or the second outlet, a temperature around the corresponding bimetal valve falls, and the corresponding bimetal valve closes the corresponding pipe, while a temperature around the other bimetal valve rises, and the other bimetal valve opens the other pipe.
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이 특허에 인용된 특허 (4)
Edstrom Soren E. H. (Quincy IL) Ertel Richard L. (Quincy IL) Litteken Robert A. (Quincy IL), Compressor control system.
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