Shell-and-tube marine heat exchanger with automatic flushing function

The utility model discloses a shell-and-tube marine heat exchanger with an automatic flushing function, a heat exchanger main body comprises a cold medium inlet and a cold medium outlet, the cold medium inlet is connected with an external circulation water inlet pipe, the cold medium outlet is connected with an external circulation water outlet pipe, and the external circulation water inlet pipe is provided with a pressure sensor and a first electric control valve. A second electric control valve is arranged on the outer circulation water outlet pipe, a water inlet flushing pipe and a water return flushing pipe are respectively connected between the outer circulation water inlet pipe and the outer circulation water outlet pipe, a third electric control valve is arranged on the water inlet flushing pipe, a fourth electric control valve and a filter are arranged on the water return flushing pipe, and a drain outlet is formed in the filter. According to the shell-and-tube marine heat exchanger with the automatic