Heat exchanger unit with backwashing pipeline structure

The utility model relates to a heat exchanger unit with a backwashing pipeline structure. The heat exchanger unit comprises a primary network inflow pipeline, a primary network return water pipeline, a plate heat exchanger, a secondary network water supply pipeline, and a secondary network return water pipeline. The heat exchanger unit is characterized in that the front end of a shutoff butterfly valve on the secondary network water supply pipeline and the front end of another shutoff butterfly valve on the secondary network return water pipeline are provided with a backwashing pipeline I equipped with a butterfly valve; the rear end of the shutoff butterfly valve on the secondary network water supply pipeline and the rear end of the shutoff butterfly valve on the secondary network return water pipeline are provided with a backwashing pipeline II equipped with another butterfly valve and a filter. The heat exchanger unit can be backwashed and cleaned in the nonstop state; the problems such as low heat exchang