A variable capacity rotary compressor including a hermetic casing in which a housing having first and second compression chambers is installed. A compressing unit is placed in the first and second compression chambers, and is operated to execute a compression operation in either the first or second
A variable capacity rotary compressor including a hermetic casing in which a housing having first and second compression chambers is installed. A compressing unit is placed in the first and second compression chambers, and is 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 also includes a first path, a second path, and a pressure control unit. The first path connects an outlet side of the rotary compressor to an inlet of the first compression chamber. The second path connects the outlet side of the rotary compressor to an inlet of the second compression chamber. The pressure controller functions to open either the first or second path, so that a pressure of the outlet side of the rotary compressor acts on the inlet of the first or second compression chamber where the idle operation is executed.
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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 ex
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 one of the first and second compression chambers according to a rotating direction of a rotating shaft which drives the compressing unit, the variable capacity rotary compressor comprising: a first path to connect an outlet side of the rotary compressor to an inlet of the first compression chamber; a second path to connect the outlet side of the rotary compressor to an inlet of the second compression chamber; and a pressure controller to open one of the first and second paths, so that a pressure of the outlet side of the rotary compressor acts on the inlet of the first or second compression chamber where an idle operation is executed. 2. The variable capacity rotary compressor according to claim 1, wherein the pressure controller comprises: a connection pipe to communicate with an interior of the hermetic casing; a first pressure control pipe branching from the connection pipe, having an outlet to communicate with the inlet of the first compression chamber, to define the first path; a second pressure control pipe branching from the connection pipe, having an outlet to communicate with the inlet of the second compression chamber, to define the second path; and a pressure control valve at a branching point of the first and second pressure control pipes, to operate as a result of a pressure difference between the first and second pressure control pipes to open one of the first and second paths. 3. The variable capacity rotary compressor according to claim 2, wherein the pressure control valve includes a valve body, the valve body comprising: an inlet at a central portion of the valve body to connect to an outlet of the connection pipe; a first outlet at a first side of the valve body to connect to an inlet of the first pressure control pipe; and a second outlet at a second side of the valve body opposite to the first outlet to connect to an inlet of the second pressure control pipe; and a valve member in the valve body to reciprocate and to open one of the first and second paths. 4. The variable capacity rotary compressor according to claim 3, wherein the pressure control valve further comprises a restoring elastic member at each of opposite sides of the valve member to cause the valve member to return to a center of the valve body when the rotary compressor is stopped. 5. 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 one of the first and second compression chambers according to a rotating direction of a rotating shaft which drives the compressing unit, the variable capacity rotary compressor further comprising: a path controller to control a refrigerant suction path to feed refrigerant to an inlet of one of the first and second compression chambers where the compression operation is executed; a first path to connect an outlet side of the compressor to a first outlet of the path controller so that the outlet side of the rotary compressor communicates with the first outlet of the path controller; a second path to connect the outlet side of the rotary compressor to a second outlet of the path controller so that the outlet side of the rotary compressor communicates with the second outlet of the path controller; and a pressure controller to open one of the first and second paths, so that a pressure of the outlet side of the rotary compressor acts on the inlet of one of the first and second compression chambers where an idle operation is executed. 6. The variable capacity rotary compressor according to claim 5, wherein the path controller comprises: a hollow body, comprising: an inlet, at a central portion of the hollow body, coupled to a refrigerant inlet pipe; first and second outlets on the hollow body at opposite sides of the inlet of the hollow body to be coupled to the inlets of the first and second compression chambers, respectively; a valve seat in the hollow body to allow an interior of the valve seat to communicate with the inlet of the hollow body and to allow both ends of the vale seat to communicate with the first and second outlets of the hollow body, respectively; and first and second valves at each of both ends of the valve seat, respectively, and axially reciprocating in the hollow body to open either of the both ends of the valve seat, the first and second valves being coupled to each other by a connecting member. 7. The variable capacity rotary compressor according to claim 6, wherein the pressure controller comprises: a connection pipe to communicate with an outlet side of the rotary compressor; first and second pressure control pipes branching from the connection pipe, with outlets of the first and second pressure control pipes respectively communicating with opposite sides of the hollow body of the path controller, to define the first and second paths, respectively; and a pressure control valve, at a branching point of the first and second pressure control pipes, to operate due to a pressure difference between the first and second pressure control pipes to open one of the first and second paths. 8. The variable capacity rotary compressor according to claim 7, wherein the pressure control valve includes a valve body, comprising: an inlet at a central portion of the valve body to connect to an outlet of the connection pipe; a first outlet at a first side of the valve body to connect to an inlet of the first pressure control pipe; and a second outlet at a second side of the valve body opposite to the first outlet to connect to an inlet of the second pressure control pipe; and a valve member in the valve body to reciprocate and to open one of the first and second paths. 9. The variable capacity rotary compressor according to claim 8, wherein the pressure control valve further comprises a restoring elastic member at each of opposite sides of the valve member to cause the valve member to return to a center of the valve body when the rotary compressor is stopped. 10. The variable capacity rotary compressor according to claim 6, wherein each of the first and second valves comprises: a thin valve plate able to come into contact with the valve seat; and a support member to support the valve plate in the hollow body. 11. The variable capacity rotary compressor according to claim 10, further comprising a plurality of holes provided on the support member. 12. A rotary compressor, including first and second compression chambers to execute compression and idle operations, in which when one of the compression chambers executes the compression operation the other executes the idle operation and vice versa, the rotary compressor comprising: a first path to connect an outlet of the rotary compressor to an inlet of the first compression chamber; a second path to connect the outlet of the rotary compressor to an inlet of the second compression chamber; and a pressure controller to open one of the first and second paths, so that a pressure of the outlet side of the rotary compressor acts on the one inlet of the first and second compression chambers in which an idle operation is executed. 13. The rotary compressor according to claim 12, further comprising a hermetic casing, wherein the pressure controller comprises a connection pipe to communicate with an interior of the hermetic casing. 14. The rotary compressor according to claim 13, wherein the pressure controller further comprises a first pressure control pipe, branching from the connection pipe, and having an outlet to communicate with the inlet of the first compression chamber to define the first path. 15. The rotary compressor according to claim 14, wherein the pressure controller further comprises a second pressure control pipe, branching from the connection pipe, and having an outlet to communicate with the inlet of the second compression chamber. 16. The rotary compressor according to claim 15, wherein the pressure controller further comprises a pressure control valve at a branching point of the first and second pressure control pipes, to operate as a result of a pressure difference between the first and second pressure control pipes to open one of the first and second paths. 17. A path controller to control a refrigerant suction path to feed refrigerant to an inlet of one of first and second compression chambers of a rotary compressor, in which a compression operation is executed, comprising: a first path to connect an outlet side of the rotary compressor to a first outlet of the path controller; a second path to connect the outlet side of the rotary compressor to a second outlet of the path controller; and a pressure controller to open one of the first and second paths, so that a pressure of the outlet side of the rotary compressor acts on the inlet of one of the first and second compression chambers where an idle operation is executed. 18. The path controller according to claim 17, wherein the path controller comprises a hollow body in which a direction of a refrigerant path is regulated. 19. The path controller according to claim 18, wherein the hollow body further comprises: an inlet in the hollow body through which refrigerant is delivered; and first and second outlets, at opposite sides of the inlet, coupled to the inlets of the first and second compression chambers, respectively. 20. The path controller according to claim 19, wherein the hollow body further comprises: a valve seat having an interior communicating with the inlet of the hollow body and ends communicating with the first and second outlets, respectively; and first and second valves at each the ends of the valve seat, respectively, to axially reciprocate in the hollow body to open one of the ends of the valve seat. 21. The path controller according to claim 20, wherein a connecting member connects the first and second valves to one another. 22. The path controller according to claim 20, wherein the pressure controller comprises: a connection pipe to communicate with an outlet side of the rotary compressor; first and second pressure control pipes branching from the connection pipe, having outlets respectively communicating with opposite sides of the hollow body of the path controller to define the first and second paths, respectively; and a pressure control valve, at a branching point of the first and second pressure control pipes, to operate due to a pressure difference between the first and second pressure control pipes to open one of the first and second paths. 23. The path controller according to claim 22, wherein the pressure control valve includes a valve body, the valve body comprising: an inlet at a central portion of the valve body to connect to an outlet of the connection pipe; a first outlet at a first side of the valve body to connect to an inlet of the first pressure control pipe; and a second outlet at a second side of the valve body opposite to the first outlet to connect to an inlet of the second pressure control pipe; and a valve member in the valve body to open one of the first and second paths. 24. A rotary compressor, including first and second compression chambers to execute compression and idle operations, in which when one of the compression chambers executes the compression operation the other executes the idle operation and vice versa, the rotary compressor comprising: a first path to connect an outlet of the rotary compressor to an inlet of the first compression chamber; a second path to connect the outlet of the rotary compressor to an inlet of the second compression chamber; and a pressure controller to apply an internal pressure of the rotary compressor to an interior of the one compression chamber which executes the idle operation, wherein a pressure differential between the internal pressure of the rotary compressor and the interior of the compression chamber which executes the idle operation is minimized.
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