The utility model discloses a vertical
impurity removal fan of a corn harvester, which comprises a fan bracket, a fan shell hung on the fan bracket, and a fan shaft inserted into the center of the fan shell, and is characterized in that a
plunger motor is vertically arranged on the fan bracket, the output end of the
plunger motor is coaxially connected with the fan shaft, and the output end of the
plunger motor is coaxially connected with the fan shaft. The motor is used for driving the
impurity removal fan to rotate in a stepless speed regulation manner; the fan shell is in a
volute shape, an
impeller is arranged on the fan shaft and located in the fan shell, the
impeller comprises a hub sleeve, a disc and a plurality of
fan blade plates are fixed to the outer edge of the hub sleeve, the
fan blade plates are evenly distributed on the periphery of the hub sleeve, the
fan blade plates are connected to the
lower face of the disc, and an included angle is formed between each fan
blade plate and the axis of the hub sleeve. The dual functions of
mashing and
impurity removal are realized; and a cutter is fixed on the fan shaft in the lower port of the fan shell and is used for
cutting up the sucked long straws. The impurity removal fan can realize stepless speed regulation, is high in impurity removal efficiency, and has dual functions of
mashing and impurity removal.