Fresh air anti-freezing system

The utility model relates to a fresh air anti-freezing system which comprises a heat pump system, and the heat pump system comprises a first expansion valve, an evaporator, a first compressor and a first condenser which are sequentially connected through pipelines to form a circulation loop. An anti-freezing solution inlet of the first condenser is connected to an anti-freezing solution outlet of the first condenser through a pipeline as well as an anti-freezing solution circulating pump and a fresh air heat exchanger which are sequentially arranged on the pipeline; during working, a refrigerant in the evaporator exchanges heat with outdoor air, and an anti-freezing solution in the fresh air heat exchanger exchanges heat with fresh air; the fresh air anti-freezing system has a fresh air heating function and has the anti-freezing characteristic when not working. 本实用新型涉及一种新风防冻系统，包括热泵系统，所述热泵系统包括通过管路依次连接形成循环回路的第一膨胀阀、蒸发器、第一压缩机和第一冷凝器，所述第一冷凝器的防冻液入口通过管路和依次设置在该管路上的防冻液循环泵和新风换热器连接至第一冷凝器的防冻液出口上；工作时，所述蒸发器内的制冷剂与室外空气换热，所述新风