Air-conditioning heat pump ventilation unit provided with functions of refrigeration, heating, domestic hot water and fresh air

The utility model provides an air-conditioning heat pump ventilation unit provided with functions of refrigeration, heating, domestic hot water and fresh air, and relates to the technical field of air conditioners. The ventilation unit comprises an air source heat pump system and a ventilation system, wherein, the heat pump system comprises a compressor, two four-way valves, a plurality of check valves, two electromagnetic valves, a throttle valve, a liquid storage tank, a gas-liquid separator, an outdoor heat exchanger and an indoor heat exchanger, so as to form an air-conditioning refrigeration and heating system; and the ventilation system comprises a circulating fan on the indoor heat exchanger and a control system. The structural characteristics of the ventilation unit are that a hot water heat exchanger and a check valve (2) are connected between a pipeline of the four-way valve (2) and an inlet of the liquid storage tank; inlet air of the indoor heat exchanger is composed of indoor return air and outdoor fresh air passing through a total heat recovery heat exchanger; and after exchanging heat through the total heat recovery heat exchanger, indoor exhaust air and the outdoor fresh air are exhausted outdoors through an air exhaust fan. Compared with the prior art, the ventilation unit is a device integrating four functions, namely air-conditioning, heating, hot water and fresh air into a whole, is simple and convenient for mounting, and has the characteristic of small occupied area.