Fixed-load embedded hot air circulating fan

The utility model discloses a fixed-load embedded hot air circulating fan which comprises a driving motor, a heat insulation plate, a fan mounting plate, a cooler, a transmission shaft, an impeller mechanism and a centrifugal machine shell. According to the fixed-load embedded type hot air circulating fan, the sealing and heat insulation effects of the installation positions of the centrifugal machine shell and the heat insulation plate are achieved through the heat insulation cotton annular pad, air leakage is prevented, and meanwhile direct conduction of heat can be avoided; the heat insulation cotton layer is filled in the heat insulation plate, so that heat can be effectively prevented from being transferred to the outside of the heating equipment, and the driving motor can be effectively protected; and the cooler can be used for effectively controlling the temperature of the two bearings mounted on the rotating shaft, so that the bearings are prevented from being seriously abradedat high temperature, and