Integrated total heat recovery air source heat pump dryer

The utility model discloses an integrated total heat recovery air source heat pump dryer in the field of grain processing equipment, which comprises a dryer tower body, a dryer, an evaporator, a compressor, a condenser, an expansion valve, a dust remover and an exhaust fan, the condenser, the expansion valve, the evaporator and the compressor are connected to form a heat pump circulating system; the dryer, the exhaust fan, the dust remover, the evaporator and the condenser are connected to form a hot air circulation system, and a total heat exchanger is further arranged in the hot air circulation system and arranged between the evaporator and the condenser through an air pipe. According to the drying device, energy in wet and hot tail air is fully utilized, the energy utilization efficiency is improved, the heating effect is better after return air is preheated, the drying effect is good, energy conservation and environmental protection are achieved, the tower type structural design is simple and easy to achi