Refrigerator

1. A refrigerator comprising:

a cabinet having a storage compartment; and

a refrigerator door configured to open and close the cabinet,

wherein the refrigerator door comprises:

a frame assembly that defines an edge of the refrigerator door and that extends in a longitudinal direction,

a front panel that is coupled to the frame assembly and that defines a front surface of the refrigerator door,

a rear panel that is coupled to the frame assembly and that defines a rear surface of the refrigerator door, and

a reinforcing panel disposed between the front panel and the rear panel,

wherein the reinforcing panel defines coupling grooves that face the front panel and that are spaced apart from one another in a vertical direction,

wherein the front panel comprises coupling protrusions that protrude from a rear surface of the front panel and that are configured to be accommodated in the coupling grooves, and

wherein the refrigerator door further comprises fixing members that are disposed in the coupling grooves and that are configured to move relative to the front panel to thereby fix or release the coupling protrusions.

2. The refrigerator of claim 1 , further comprising:

rotation shafts that extend in the vertical direction and that are disposed between the reinforcing panel and the rear panel, the rotation shafts passing through the coupling grooves,

wherein the fixing members are accommodated inside the coupling grooves and connected to the rotation shafts, the fixing members being configured to rotate forward or rearward according to a rotation direction of the rotation shaft to thereby fix or release the coupling protrusions.

3. The refrigerator of claim 2 , wherein each of the coupling protrusions comprises:

a first extension extending rearward from the rear surface of the front panel; and

a second extension extending from the first extension toward one of the rotation shafts.

4. The refrigerator of claim 3 , wherein the first extension and the second extension define an obtuse angle.

5. The refrigerator of claim 3 , wherein the second extension has (i) a first end connected to the first extension and (i) a second end spaced apart from the first end, and

wherein a thickness of the second end of the second extension is greater than a thickness of the first end connected to the first extension.

6. The refrigerator of claim 3 , wherein the second extension defines a protrusion that protrudes toward one of the fixing members and that is configured to be locked by the one of the fixing members.

7. The refrigerator of claim 2 , wherein each of the coupling protrusions comprises:

a first extension extending rearward from the rear surface of the front panel; and

a second extension extending from the first extension in a horizontal direction.

8. The refrigerator of claim 7 , wherein the first extension and the second extension define a right angle.

9. The refrigerator of claim 7 , wherein each of the coupling protrusions defines a coupling recess that is concave in the horizontal direction from an inside of the front panel to an outside of the front panel.

10. The refrigerator of claim 9 , wherein each of the fixing members comprises:

a shaft connector coupled to one of the rotation shafts and configured to rotate together with the one of the rotation shafts; and

a slider configured to move in the horizontal direction and configured to be selectively drawn in or drawn out of the coupling recess by rotation of the shaft connector.

11. The refrigerator of claim 10 , wherein each of the fixing members further comprises an elastic member that connects the shaft connector and the slider and that is configured to move the slider along a straight line based on rotation of the shaft connector.

12. The refrigerator of claim 2 , further comprising a lever that is configured to manipulate at least one of the rotation shafts and that is coupled to an upper end of the at least one of the rotation shafts.

13. The refrigerator of claim 12 , wherein the lever is configured to, based on rotating rearward, switch the front panel to a locked state, and

wherein the lever is configured to, based on rotating forward, switch the front panel to an unlocked state.

14. The refrigerator of claim 12 , further comprising an upper cap deco and a fastening member that rotatably couples the lever to an upper end of the upper cap deco.

15. The refrigerator of claim 12 , further comprising an upper cap deco that defines an upper surface of the refrigerator door,

wherein the rotation shafts pass through the upper cap deco, and

wherein upper ends of the rotation shafts and the lever are exposed to an outside of the upper cap deco.

16. The refrigerator of claim 15 , wherein the upper cap deco defines a lever groove that is concave downward, and

wherein the lever is accommodated in the lever groove.

17. The refrigerator of claim 1 , wherein the reinforcing panel defines an opening that is open in a front-and-rear direction,

wherein the refrigerator door further comprises a groove member that is concave rearward and that is coupled to a rear surface of the reinforcing panel, and

wherein each of the coupling grooves is defined by an inner space of the groove member and the opening.

18. The refrigerator of claim 1 , wherein at least a portion of an inner surface of each of the coupling grooves is a curved surface or an inclined surface.

19. The refrigerator of claim 1 , wherein the reinforcing panel has irregularities in a horizontal direction, and

wherein the reinforcing panel has a front surface facing the front panel, and at least a portion of the front surface of the reinforcing panel is flat.

20. The refrigerator of claim 1 , further comprising a heat insulating layer that is made of a heat insulating material and that is disposed between the reinforcing panel and the rear panel.