Patent attributes
A refrigerator and an air passage device thereof. The air passage device comprises an air passage cover plate, an air passage foam, and an air door which comprises: a base plate part provided with at least one arcuate guide hole and an elongate through hole parallel with the arcuate guide hole, wherein the hole wall of at least a part of the arcuate guide holes is provided with multiple limiting portions, and the elongate through hole is arranged close to the side at which the hole wall is provided with the limiting portions; and a shielding part which adjusts the ventilation area of the air passage when being rotated, and at least one guide column, which is inserted into a corresponding arcuate guide hole and cooperates with the arcuate guide hole by interference fit. The air door is simple in structure, convenient in operation and does not consume any power.