Patent ID: 8905502

Claim:
A refrigerator comprising: a cabinet including an outer case, an inner case and a thermal insulator filled between the outer case and the inner case, providing a storage space that is opened and closed by a door; and a pressure adjustment device disposed at the cabinet, wherein an inside of the refrigerator communicates with an outside thereof through the pressure adjustment device so as to remove a pressure difference between the inside and the outside of the refrigerator when the door is opened, wherein the pressure adjustment device comprises: a connecting tube passing through the cabinet, an end of the connecting tube fixed in an insertion hole of the inner case and the other end of the connecting tube passing through a through hole of the outer case; a flange defining through hole formed by bending the outer case toward inside of the cabinet; a thermal insulating member is interposed between the flange and a peripheral surface of the connecting tube to prevent thermal conduction between the connecting tube and the outer case; a main tube coupled to the connecting tube from the outside of the cabinet; and an opening/closing unit disposed within the main tube to open and close a passage of the pressure adjustment device, and wherein the main tube comprising: a horizontal part provided with a connecting part that is disposed outside of the cabinet and is coupled to the connecting tube; the connecting part extended from the horizontal part and inserted into the end of the connecting tube that protrudes outside of the through hole; a receiving part protruded apart from the connecting part and receiving the end of the connecting tube and covering the thermal insulating member, and a vertical part bent downward from the horizontal part, wherein the opening/closing unit for opening and closing an air passage is disposed in the vertical part, and wherein the opening/closing unit comprises a valve cap, the valve cap is inserted in the vertical part and the valve cap covers a bottom opening of the vertical part.