Self-balancing fresh air ventilator with silencing function

The utility model belongs to the field of fresh air fans. The utility model relates to a fresh air ventilator, in particular to a self-balancing fresh air ventilator with a silencing function. An existing fresh air ventilator works for a long time; a large amount of dust and blockages are accumulated on the filter screen; the problem of poor air filtering effect caused by long-time non-cleaning issolved; proposed now is the following scheme, it comprises a housing, a fan is arranged in the shell; silencing plate is arranged on fan, an air inlet pipe is arranged on one side of the shell; filter screen is arranged in the air inlet pipe, a placement box is fixedly mounted on one side of the air inlet pipe; an opening is formed in one side of the placing box; the filter screen cleaning deviceis simple in structure, the motor operates to drive the swing rod to swing, the swing rod swings to drive the moving rod to move, the moving rod moves to drive the cleaning brush to clean the filterscreen, and the swing rod s