Fan for air purification device and air purification device

The utility model discloses a fan for an air purification device, which comprises a sealed cabin, fan blades and a rotating shaft fixedly connected with the fan blades, the fan blades and the rotating shaft are all arranged in the sealed cabin, the other end of the rotating shaft penetrates through a shaft hole and extends out of the sealed cabin, and a sealing device is arranged at the position of the shaft hole. The motor driving device is arranged outside the sealed cabin, and an output shaft of the motor driving device is in transmission connection with the rotating shaft. According to the utility model, a fan in the prior art is changed into a mode that the fan blades are independent from the motor transmission device, the fan blades are arranged in the sealed cavity to participate in gas circulation operation, and the motor transmission device is arranged outside, so that the fan does not need to utilize circulating air flow to dissipate heat, the maintenance is more convenient, and the fan blade part i