Refrigerator

1. A refrigerator comprising:

a main cabinet comprising a cooling device configured to generate cold air;

a sub-cabinet detachably connected to the main cabinet;

a cold air relay duct having a cold air flow path that connects the main cabinet to the sub-cabinet to allow the cold air generated by the cooling device to be delivered to the sub-cabinet; and

a heat blocker provided in a portion of the cold air flow path at which the main cabinet and the cold air relay duct are connected and in a portion of the cold air flow path at which the sub-cabinet and the cold air relay duct are connected,

wherein the cold air flow path is formed by an inner space of a cylindrical member formed of a resin material, and

wherein the cylindrical member comprises:

a first cylindrical member forming a main flow path,

a second cylindrical member forming a sub flow path, and

a third cylindrical member forming a relay flow path.

2. The refrigerator according to claim 1 , wherein the cold air flow path comprises:

the main flow path formed in the main cabinet;

the sub flow path formed in the sub-cabinet; and

the relay flow path formed in the cold air relay duct to connect the main flow path and the sub flow path.

3. The refrigerator according to claim 2 , wherein the heat blocker is provided at a connection portion between the main flow path and the relay flow path and at a connection portion between the sub flow path and the relay flow path.

4. The refrigerator according to claim 3 ,

wherein the main cabinet comprises a first facing surface facing the cold air relay duct,

wherein the sub-cabinet comprises a second facing surface facing the cold air relay duct, and

wherein the cold air relay duct comprises a third facing surface facing the main cabinet and a fourth facing surface facing the sub-cabinet.

5. The refrigerator according to claim 4 , wherein the heat blocker comprises:

a first heat blocker provided between the main flow path and the first facing surface;

a second heat blocker provided between the sub flow path and the second facing surface;

a third heat blocker provided between the relay flow path and the third facing surface; and

a fourth heat blocker provided between the relay flow path and the fourth facing surface.

6. The refrigerator according to claim 5 ,

wherein the first heat blocker comprises a first passing hole, and

wherein the third heat blocker comprises a third passing hole to connect the main flow path and the relay flow path, respectively.

7. The refrigerator according to claim 6 , wherein at least one of the first passing hole and the third passing hole is formed in a tapered shape in which a width at ends connected to each other gradually increases.

8. The refrigerator according to claim 5 ,

wherein the second heat blocker comprises a second passing hole, and

wherein the fourth heat blocker comprises a fourth passing hole to connect the sub flow path and the relay flow path, respectively.

9. The refrigerator according to claim 8 , wherein at least one of the second passing hole and the fourth passing hole is formed in a tapered shape in which a width at ends connected to each other gradually increases.

10. The refrigerator according to claim 4 , wherein the second facing surface of the sub-cabinet and the fourth facing surface of the cold air relay duct facing the second facing surface have an inclined surface inclined with respect to a horizontal direction.

11. The refrigerator according to claim 10 ,

wherein the cold air relay duct comprises a protrusion formed on the third facing surface to protrude downward, and

wherein the main cabinet comprises a recess portion formed on the first facing surface to allow the protrusion to be inserted.

12. The refrigerator according to claim 10 , wherein the inclined surface is provided to have an angle between 25 and 65 degrees with respect to the horizontal direction.

13. The refrigerator according to claim 4 ,

wherein the first facing surface of the main cabinet and the third facing surface of the cold air relay duct facing the first facing surface have a first inclined surface inclined with respect to a horizontal direction, and

wherein the second facing surface of the sub-cabinet and the fourth facing surface of the cold air relay duct facing the second facing surface have a second inclined surface inclined with respect to the horizontal direction.

14. The refrigerator according to claim 4 ,

wherein a first sealer is provided between the first facing surface of the main cabinet and the third facing surface of the cold air relay duct, and

wherein a second sealer is provided between the second facing surface of the sub-cabinet and the fourth facing surface of the cold air relay duct.

15. The refrigerator according to claim 1 , wherein the heat blocker has a lower thermal conductivity than a thermal conductivity of the cylindrical member.

16. The refrigerator according to claim 1 , wherein the cold air relay duct connects the main cabinet and the sub-cabinet such that at least a portion of a surface thereof is exposed to the outside.