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Disclosed are a reciprocating compressor and a refrigerator having the same. The reciprocating compressor comprises a casing, one reciprocating motor mounted at a frame unit provided in the casing for generating a linear-reciprocation driving force, a first compression unit for compressing a refrige

Disclosed are a reciprocating compressor and a refrigerator having the same. The reciprocating compressor comprises a casing, one reciprocating motor mounted at a frame unit provided in the casing for generating a linear-reciprocation driving force, a first compression unit for compressing a refrigerant directly sucked without passing through the inside of the casing by receiving the driving force of the reciprocating motor, and a second compression unit for mixing a refrigerant introduced into the casing and a refrigerant discharged from the first compression unit and then compressing the mixed refrigerant once more by receiving the driving force of the reciprocating motor. Accordingly, a refrigerant is consecutively compressed two times, components are simplified, and the compressor is easily controlled. Also, the refrigerator having the reciprocating compressor decreases a load of the reciprocating compressor thereby to enhance the efficiency of the refrigerator.

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What is claimed is: 1. A reciprocating compressor comprising: a casing; a frame elastically supported in an inner space of the casing; a reciprocating motor including an inner stator and an outer stator fixed on the frame, and a linearly-movable mover inserted between the inner stator and the outer

What is claimed is: 1. A reciprocating compressor comprising: a casing; a frame elastically supported in an inner space of the casing; a reciprocating motor including an inner stator and an outer stator fixed on the frame, and a linearly-movable mover inserted between the inner stator and the outer stator; a two-stage cylinder, mounted at the frame, having first and second cylinder bores of different diameters with a stepped surface therebetween; a two-stage piston, having a first piston portion and a second piston portion having diameters corresponding to the diameters of the first and second cylinder bores, the first and second piston portions linearly-reciprocating in the same direction in the two-stage cylinder by the driving force of the reciprocating motor so as to simultaneously suck, compress and discharge refrigerant; a resonant spring that causes the two-stage piston to move in a resonant motion; a first suction valve and a first discharge valve, respectively disposed at an inlet and an outlet of a first compression space formed by the first piston portion and the first cylinder bore; a second suction valve and a second discharge value, respectively disposed at an inlet and an outlet of a second compression space formed by the second piston portion and the second cylinder bore; a first suction pipe that is connected at an inlet side of the first compression space and extends through the casing; a second suction pipe that is connected at an inlet side of the second compression space and extends through the casing; and a discharge pipe that is connected at an outlet side of the second compression space and extends through the casing, wherein refrigerant is directly introduced into the first compression space through the first suction pipe, the refrigerant is compressed in the first compression space and discharged into the inner space of the casing, the compressed refrigerant is introduced into the second compressed space and mixed with other refrigerant which is directly introduced into the casing through the second suction pipe, and the mixed refrigerant in the second compression space is discharged outside of the casing through the discharge pipe. 2. The reciprocating compressor of claim 1, wherein the inlet side of the first compression space is provided with a chamber having a space in which liquid refrigerant is vaporized. 3. The reciprocating compressor of claim 2, wherein the chamber comprises: an opening formed at one side of the frame; and a cover that covers the opening. 4. The reciprocating compressor of claim 1, wherein the stepped surface between the first cylinder bore and the second cylinder bore is perpendicular to axes of the first and second cylinder bores, and a stepped surface between the first piston portion and the second piston portion of the two-stage piston is perpendicular to axes of the first and second piston portions. 5. The reciprocating compressor of claim 1, wherein a first suction opening that connects the first suction pipe and the inlet side of the first compression space is formed in the frame; and a second suction opening that connects the first suction opening and the first compression space is formed in the two-stage cylinder. 6. The reciprocating compressor according to claim 1, wherein a gas passage for introducing refrigerant from the inner space of the casing into the second compression space is provided within the two-stage piston. 7. A compressor comprising: a casing; a drive mechanism that includes an inner stator and an outer stator, and a linearly-movable mover inserted between the inner stator and the outer stator so as to generate a linear reciprocation driving force; a first chamber into which a refrigerant is introduced from outside the casing, the refrigerant being compressed within the first chamber by action of the drive mechanism and being discharged to a second chamber; the second chamber, which receives the refrigerant compressed in the first chamber, and mixes the compressed refrigerant with additional refrigerant to provide a mixed refrigerant; a third chamber into which the mixed refrigerant is introduced and is further compressed by action of the drive mechanism, the compressed mixed refrigerant being discharged to an exterior of the casing; a first valve that opens and closes a flow path to guide refrigerant into the first chamber; a second valve that controls a discharge of compressed refrigerant from the first chamber into the second chamber; a third valve that controls a flow of mixed refrigerant from the second chamber to the third chamber; and a fourth valve that controls a flow of the compressed mixed refrigerant from the third chamber to outside of the casing, wherein the first, second and third chambers comprise a compression unit, said compression unit comprising a two-stage cylinder having first and second bores of different diameters and a two-stage piston having first and second piston portions having diameters corresponding to the diameters of the first and second bores, and the first and third chambers simultaneously open and close so that the refrigerant in the first chamber and the mixed refrigerant in the second chamber are sucked, compressed and discharged simultaneously. 8. The compressor according to claim 7, said second chamber comprising an interior space of the two-stage piston. 9. The compressor according to claim 7, said first and third chambers being provided in spaces defined by said two-stage cylinder and said two-stage piston. 10. A refrigerator having a body provided with a freezing compartment and a refrigerating compartment, a condenser, a freezing compartment evaporator and a refrigerating compartment evaporator mounted to the body, and a reciprocating compressor, the compressor comprising: a casing; a frame elastically supported in an inner space of the casing; a reciprocating motor including an inner stator and an outer stator fixed on the frame, and a linearly-movable mover inserted between the inner stator and the outer stator; a two-stage cylinder, mounted at the frame, having first and second cylinder bores of different diameters with a stepped surface therebetween; a two-stage piston, having a first piston portion and a second piston portion having diameters corresponding to the diameters of the first and second cylinder bores, the first and second piston portions linearly-reciprocating in the same direction in the two-stage cylinder by the driving force of the reciprocating motor so as to simultaneously suck, compress and discharge refrigerant; a resonant spring that causes the two-stage piston to move in a resonant motion; a first suction valve and a first discharge valve, respectively disposed at an inlet and an outlet of a first compression space formed by the first piston portion and the first cylinder bore; a second suction valve and a second discharge valve, respectively disposed at an inlet and an outlet of a second compression space formed by the second piston portion and the second cylinder bore; a first suction pipe that connects the freezing compartment evaporator and the first compression space, and extends through the casing; a second suction pipe that connects the refrigerating compartment evaporator and the inner space of the casing, and extends through the casing; and a discharge pipe that connects the outlet side of the second compression space and the condenser, wherein refrigerant is directly introduced into the first compression space from the freezing compartment evaporator through the first suction pipe, the refrigerant is compressed in the first compression space and discharged into the inner space of the casing, the compressed refrigerant is introduced into the second compression space and mixed with other refrigerant which is directly introduced into the casing through the second suction pipe, the mixed refrigerant in the second compression space is discharged outside of the condenser through the discharge pipe, and refrigerant introduced into the condenser is divided into the freezing compartment evaporator and the refrigerant compartment evaporator. 11. The refrigerator of claim 10, wherein a gas passage for introducing refrigerant from the inner space of the casing into the second compression space is provided within the two-stage piston. 12. The refrigerator of claim 10, wherein the inlet side of the first compression space is provided with a chamber having a space in which liquid refrigerant is vaporized. 13. The refrigerator of claim 12, wherein the chamber comprises: an opening formed at one side of the frame; and a cover that covers the opening. 14. The refrigerator of claim 10, wherein the stepped surface between the first cylinder bore and the second cylinder bore is perpendicular to axes of the first and second cylinder bores, and a stepped surface between the first piston portion and the second piston portion of the two-stage piston is perpendicular to axes of the first and second piston portions. 15. The refrigerator of claim 10, wherein a first suction opening that connects the first suction pipe and the inlet side of the first compression space is formed in the frame; and a second suction opening that connects the first suction opening and the first compression space is formed in the two-stage cylinder.