The utility model relates to the technical field of
refrigeration equipment, and provides a refrigerator
defrosting air duct structure and a refrigerator, the refrigerator
defrosting air duct structure comprises a box body, a wind shield and a
shape memory alloy spring, the box body comprises a
refrigeration air duct and a ventilation opening, the
refrigeration air duct communicates with a refrigeration chamber of the refrigerator through the ventilation opening, and the wind shield is movably arranged at the ventilation opening; the
shape memory alloy spring is connected with the wind shield and used for driving the wind shield to close the ventilation opening when the temperature is higher than the first temperature. The
shape memory alloy spring drives the wind shield to move to close the ventilation opening, and in the
defrosting process, when the electric heater starts to work and the temperature in the air duct rises, the shape memory
alloy spring can respond to temperature change and drive the wind shield to close the ventilation opening through the unique thermally-induced deformation characteristic of the shape memory
alloy spring. High-temperature air in the air duct is effectively isolated and prevented from flowing into the refrigeration chamber, so that the temperature of the refrigeration chamber is prevented from rising, and the stability of a
food storage environment in the refrigeration chamber is ensured.