Air duct structure of fog-free humidifier

The utility model provides an air duct structure of a fog-free humidifier, which is applied to the field of humidifiers and comprises a barrel, an air inlet, a heating body, a wind wheel, a motor, an annular air duct and an evaporation cavity, the heating body is arranged at the bottom end in the cylinder, one end of the air inlet is exposed out of the side face of the cylinder, and the other end of the air inlet is connected with the heating body. The heating body is transversely arranged at the bottom end of the cylinder body and is connected with the annular air duct; the annular air duct is of a kettle-shaped structure, the motor and the wind wheel are arranged in the middle of the interior of the annular air duct, and the top end of the annular air duct extends into the evaporation cavity; the problems that the size of an existing wind wheel must be large enough so that large wind pressure and large wind volume can be obtained at a low rotating speed are solved; the annular air duct needs to be gradually