Waste heat recovery device for grain dryer

The utility model discloses a waste heat recovery device for a grain drying machine, which is provided with a buffer chamber and a heat exchange structure, the buffer chamber and the heat exchange structure form four relatively independent isolation chambers which are used for carrying out heat exchange on damp and hot air discharged from the grain drying machine and ambient air, and preheated hot air enters a heating chamber to be further heated. A thermocouple is arranged at an outlet of the heating chamber, and the amount and temperature of discharged hot air can meet the hot air requirement of a drying inlet of the grain dryer by regulating and controlling the environment air supply amount and the heat source supply efficiency, so that heat energy for drying grains is replaced or supplemented, and energy conservation and consumption reduction are achieved. Hot air emptying can be reduced, and the negative influence on environment warming is reduced. 本实用新型公开了一种用于粮食烘干机的余热回收装置，设置有缓冲室、换热结构，缓冲室与换热结构形成四个相对独立的隔离