A refrigerator includes a compressor compressing a refrigerant, a condenser condensing the refrigerant compressed in the compressor, a refrigerant tube guiding a flow of the refrigerant condensed in the condenser, an expansion device decompressing the refrigerant condensed in the condenser, and an e
A refrigerator includes a compressor compressing a refrigerant, a condenser condensing the refrigerant compressed in the compressor, a refrigerant tube guiding a flow of the refrigerant condensed in the condenser, an expansion device decompressing the refrigerant condensed in the condenser, and an evaporator evaporating the refrigerant decompressed in the expansion device. The evaporator includes an evaporation tube through which the refrigerant decompressed in the expansion device flows, a coupling tube through a refrigerant heat-exchanged with the refrigerant of the evaporator flows, and a heat-exchange fin coupled to the evaporation tube and the coupling tube.
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1. A refrigerator comprising: a plurality of compressors configured to compress a refrigerant and including a first compressor and a second compressor;a condenser configured to condense the refrigerant compressed in the compressor;a refrigerant tube to guide a flow of the refrigerant condensed in th
1. A refrigerator comprising: a plurality of compressors configured to compress a refrigerant and including a first compressor and a second compressor;a condenser configured to condense the refrigerant compressed in the compressor;a refrigerant tube to guide a flow of the refrigerant condensed in the condenser;an expansion device configured to decompress the refrigerant condensed in the condenser; andan evaporator configured to evaporate the refrigerant decompressed in the expansion device, wherein the evaporator includes: an evaporation tube through which the refrigerant decompressed in the expansion device flows,a coupling tube through which one-stage compressed refrigerant discharged from the second compressor flows, anda heat-exchange fin coupled to the evaporation tube and the coupling tube, andwherein the one-stage compressed refrigerant in the coupling tube is heat-exchanged with the refrigerant of the evaporation tube, suctioned into the first compressor, and two-stage compressed. 2. The refrigerator of claim 1, wherein the evaporator comprises a first evaporator coupled to the coupling tube and a second evaporator provided at one side of the first evaporator, the refrigerant evaporated in the second evaporator is suctioned into the second compressor, andthe refrigerant discharged from the second evaporator flows into the coupling tube of the first evaporator. 3. The refrigerator of claim 2, wherein the refrigerant evaporated in the first evaporator is mixed with the refrigerant flowing into the coupling tube. 4. The refrigerator of claim 1, wherein the coupling tube comprises a suction assembly including the expansion device and a suction tube guiding the refrigerant passing through the evaporator into the compressor. 5. The refrigerator of claim 4, wherein the suction tube is coupled to the expansion device through a coupling part. 6. The refrigerator of claim 5, wherein the coupling part is formed by soldering. 7. The refrigerator of claim 4, wherein the evaporator includes a first evaporator and a second evaporator, and the suction assembly includes a first suction assembly coupled to the first evaporator, and a second suction assembly coupled to the second evaporator. 8. The refrigerator of claim 7, wherein the compressor comprises a first compressor coupled to the first suction tube of a first suction tube of the first suction assembly, and a second compressor coupled to a second suction tube of the second suction assembly, the refrigerant compressed in the second compressor being mixed with the refrigerant of the first suction tube. 9. The refrigerator of claim 4, further comprising a main body defining a storage compartment, the main body including an outer case, an inner case, and an insulation material, wherein the coupling tube is provided between the evaporator and the insulation material. 10. The refrigerator of claim 9, wherein the suction tube is provided on one side of the inner case, and the expansion device is coupled to the evaporator. 11. The refrigerator of claim 1, wherein the evaporator includes a first evaporator and a second evaporator, and the refrigerator further comprises first and second refrigerant passages branched from the refrigerant tube to guide the refrigerant into the first and second evaporators, and a flow adjustment part disposed on a branch part that is branched into the first and second refrigerant passages to adjust a flow rate of the refrigerant. 12. The refrigerator of claim 11, further comprising: a temperature sensor detecting temperatures of an inlet and outlet of the first evaporator and temperatures of an inlet and outlet of the second evaporator;a memory in which information with respect to a control time of a variation in amount of refrigerant flowing into the first refrigerant passage or the second refrigerant passage is mapped and stored; anda control unit configured to control the supply of the refrigerant into the first and second evaporators on the basis of the information mapped in the memory,wherein the control unit determines whether control time is changed on the basis of the information detected by the temperature sensor. 13. The refrigerator of claim 12, wherein the information with respect to the control time comprises: information with respect to a first set-up time at which an amount of refrigerant supplied into the first evaporator increases to prevent the refrigerant from being concentrated into the second evaporator; andinformation with respect to a second set-up time at which an amount of refrigerant supplied into the second evaporator increases to prevent the refrigerant from being concentrated into the first evaporator. 14. The refrigerator of claim 13, wherein the control unit increases the second set-up time when the refrigerant concentration into the first evaporator is determined and decreases the second set-up time when the refrigerant concentration into the second evaporator is determined of the information detected by the temperature sensor. 15. The refrigerator of claim 12, further comprising: a first flow rate adjustment part disposed in the first refrigerant passage; anda second flow rate adjustment part disposed in the second refrigerant passage,wherein the information with respect to the control time comprises time information with respect to operation states of the flow adjustment part and the first and second flow rate adjustment parts. 16. The refrigerator of claim 15, wherein an opening degree of the first flow adjustment part is adjusted so that the opening degree of the first flow adjustment part is greater than that of the second flow adjustment part to increase an amount of refrigerant supplied into the first evaporator, and an opening degree of the second flow adjustment part is adjusted so that the opening degree of the second flow adjustment part is greater than that of the first flow adjustment part to increase an amount of refrigerant supplied into the second evaporator. 17. A refrigerator comprising: a compressor configured to compress a refrigerant;a condenser configured to condense the refrigerant compressed in the compressor;a refrigerant tube to guide a flow of the refrigerant condensed in the condenser;an expansion device configured to decompress the refrigerant condensed in the condenser; andan evaporator configured to evaporate the refrigerant decompressed in the expansion device, wherein the evaporator includes: an evaporation tube through which the refrigerant decompressed in the expansion device flows,a coupling tube through a refrigerant heat-exchanged with the refrigerant of the evaporator flows, anda heat-exchange fin coupled to the evaporation tube and the coupling tube, andwherein the heat-exchange fin includes a first insertion part in which the evaporation tube is coupled, and a second insertion part in which the coupling tube is coupled. 18. The refrigerator of claim 17, wherein the second insertion part comprises at least one of a through-hole through which the coupling tube passes and a recess part in which at least one portion of the heat-exchange fin is recessed.
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