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 having a hollow body and a valve unit, and a pressure controller. The hollow body has 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 valve unit is installed in the hollow body to axially reciprocate in the hollow body to change a refrigerant suction path by a pressure difference between the first and second outlets of the hollow body. The pressure controller includes a high-pressure pipe to connect an outlet side of the compressor to the suction path controller, and first and second communicating paths provided on both sides of the valve unit to be spaced apart from each other.
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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, to e
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, 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, including a hollow body, having 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 corresponding inlet ports of the first and second compression chambers, and a valve unit installed in the hollow body to axially reciprocate in the hollow body to change a refrigerant suction path by a pressure difference between the first and second outlets of the hollow body; and a pressure controller, including a high-pressure pipe to connect an outlet side of the compressor to the suction path controller, and first and second communicating paths provided on both sides of the valve unit to be spaced apart from each other, either the first or second communicating path communicating with an outlet of the high-pressure pipe in response to an operation of the valve unit so that a pressure of the high-pressure pipe acts on the first or second compression chamber where an idle operation is executed. 2. The variable capacity rotary compressor according to claim 1, wherein the valve unit comprises: 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 respectively provided at both sides 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 rod. 3. The variable capacity rotary compressor according to claim 2, further comprising: a rod supporter provided in the valve seat to support the rod so that the rod passes through the valve seat, with a path being provided on a predetermined portion of the rod supporter to connect the high-pressure pipe to a through hole which the rod passes through. 4. The variable capacity rotary compressor according to claim 3, wherein the first communicating path extends from a first position of the rod to correspond to an outlet of the high-pressure pipe to communicate with a first end of the rod which is adjacent to the second outlet of the hollow body, so that the high-pressure pipe communicates with the second outlet of the hollow body, when the first and second valves move toward the first outlet of the hollow body so that a refrigerant is delivered into the first outlet of the hollow body. 5. The variable capacity rotary compressor according to claim 4, wherein the second communicating path extends from a second position of the rod to correspond to the outlet of the high-pressure pipe to communicate with a second end of the rod which is adjacent to the first outlet of the hollow body, so that the high-pressure pipe communicates with the first outlet of the hollow body, when the first and second valves move toward the second outlet of the hollow body so that the refrigerant is delivered into the second outlet of the hollow body. 6. The variable capacity rotary compressor according to claim 5, further comprising communicating grooves respectively provided around each of the first and second positions of the rod to connect the outlet of the high-pressure pipe to the first or second communicating path even when the rod rotates. 7. The variable capacity rotary compressor according to claim 3, further comprising sealing members provided on both ends of the through hole which is formed on a predetermined portion of the rod supporter to prevent air from leaking through a gap between the through hole and the rod. 8. The variable capacity rotary compressor according to claim 2, wherein each of the first and second valves comprises: a thin valve plate to contact with the valve seat; and a supporter to support the thin valve plate. 9. A compressor, including first and second compression chambers, having inlets and outlets on an inlet and an 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 hollow body having outlets and a refrigerant suction path, to deliver a refrigerant to the inlet of the compression chamber where the compression operation is executed; a valve unit installed in the hollow body to change the refrigerant suction path by a pressure difference between the first and second outlets of the hollow body; and a pressure controller, including a high-pressure pipe to connect an outlet side of the compressor to the suction path controller, and first and second communicating paths respectively provided on both sides of the valve to be spaced apart from each other, either the first or second communicating path communicating with an outlet of the high-pressure pipe in response to an operation of the valve so that a pressure of the high-pressure pipe acts on the first or second compression chamber where an idle operation is executed. 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 9, wherein the suction path controller comprises an inlet at a control portion of the hollow body to supply refrigerant to the 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, respectively, 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 13, wherein the cylindrical valve seat comprises: an opening at a center thereof to communicate with the inlet; a rod supporter having a through hole, through which the rod extends, to support the rod; and an outer surface which is press fit into the hollow body. 15. The compressor according to claim 9, further comprising a hermetic casing around the compressor, wherein the pressure controller causes an outlet pressure of the compressor to be applied to the compression chamber where the idle operation is executed to allow the internal pressure of the compression chamber to be equal to the internal pressure of the hermetic casing. 16. The compressor according to claim 13, wherein the high pressure pipe comprises: a high pressure pipe to connect the outlet side of the compressor with the suction path controller; and first and second communicating paths, provided on sides of the rod, to allow the high pressure pipe to communicate with the inlets of the compression chambers. 17. The compressor according to claim 16, further comprising first and second communicating paths, having an initial end, in the rod supporter, wherein: the high pressure pipe is connected to a predetermined portion of the rod supporter, and the high pressure pipe comprises an outlet which is allowed to communicate with the through hole of the rod supporter via the initial end of the communicating path. 18. The compressor according to claim 17, wherein: the first communicating path extends from a first position of the rod, in which the rod is adjacent to the second outlet of the body such that the outlet of the high pressure pipe communicates with the second outlet, so that refrigerant is delivered to the first outlet, and the second communicating path extends from a second position of the rod, in which the rod is adjacent to the first outlet of the body such that the outlet of the high pressure pipe communicates with the first outlet, so that refrigerant is delivered to the second outlet. 19. The compressor according to claim 18, further comprising: communicating grooves respectively provided around the first and second positions of the rod to correspond to inlets of the first and second communicating paths so that the outlet of the high pressure pipe is connected to the first or second communicating paths; and sealing members respectively on both ends of the through hole of the rod supporter which the rod extends through to prevent air from leaking through a gap between the through hole and the rod.
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이 특허에 인용된 특허 (2)
Harte Shane Anthony ; Khetarpal Vipen Kumar ; Strikis Guntis Viktors, Variable capacity rolling piston compressor.
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