Mechanical defrosting device of exterior heat exchanger of electric automobile heat pump air conditioning system

The invention discloses a mechanical defrosting device of an electric automobile heat pump air conditioning system. The mechanical defrosting device comprises an air accelerator, a defrosting device body, a transmission device and a detection sensor, wherein the air accelerator is installed in front of an exterior heat exchanger, the defrosting device body is located above the exterior heat exchanger and comprises a scraping head connecting rod, a defrosting hard scraping head and a defrosting soft scraping head, the transmission device is installed on the side part of the exterior heat exchanger so as to drive the defrosting device body to do reciprocating rectilinear motion on the exterior heat exchange, and the detection sensor is used for controlling action timing of the transmission device. The mechanical defrosting device has the advantages that condensed water on the exterior heat exchanger is blown through the air accelerator, so that accumulation of the condensed water on theexterior heat exchanger i