US Patent 11179994 Heat pump for automobile

A heat pump for a vehicle is provided in which the heat pump includes a compressor, an inner heat exchanger, an outer heat exchanger, a first expansion unit, a second expansion unit, an evaporator, an accumulator, a third heat exchanger, a first directional control valve, a second directional control valve, and a dehumidification line, and performs cooling, heating, defrosting, and dehumidifying operations according to the flow of a refrigerant.