Flooded water-source heat pump unit with refrigerant side cold and heat reversion

The invention relates to a flooded water-source heat pump unit with refrigerant side cold and heat reversion and belongs to the technical field of the water-source heat pumps. The unit comprises a compressor, a use side heat exchanger, a sewage side heat exchanger, a throttle valve, a filter, an oil separator and a plurality of valves, wherein an outlet of the compressor is connected with an inlet of the oil separator; an outlet of the oil separator is connected with a first opening on the top of the use side heat exchanger and is also connected with a first opening on the top of the sewage side heat exchanger; an inlet of the compressor is connected with a second opening on the top of the use side heat exchanger and is also connected with a second opening on the top of the sewage side heat exchanger; a first path of opening on the bottom of the use side heat exchanger is connected with an inlet end of the filter; an outlet end of the filter is connected with an inlet of the throttle valve; a second path of opening on the bottom of the use side heat exchanger is connected with an outlet of the throttle valve; a first path of opening on the bottom of the sewage side heat exchanger is connected with an inlet of the filter; and a second path of opening of the sewage side heat exchanger is connected with the outlet of the throttle valve. The unit simplifies a pipeline of a machine room and is convenient to operate and maintain.