Abstract: A driving assembly includes a motor bracket, a first driving motor arranged on the motor bracket, a spherical crank, and a second driving motor arranged on the motor bracket and spaced apart from the first driving motor. The spherical crank includes a connecting pillar and a ball head. One end of the connecting pillar is connected with an output shaft of the first driving motor. The ball head is arranged at another end of the connecting pillar. A sphere center of the ball head is not on a rotation axis of the connecting pillar. The second driving motor includes an output shaft arranged at a first end of the second driving motor and configured to be connected with a fan blade. A second end of the second driving motor is rotatably connected with the ball head.

Abstract: A rear guard of a box fan comprises: a body arranged vertically and a waterproof part arranged on the body. The waterproof part is arranged in a position corresponding to a motor in the box fan and the waterproof part comprises a plurality of recessed structures arranged on the body. a plurality of vent holes are arranged on the body for communicating an inner side of the body with an outer side of the body are arranged in the recessed structures. By arranging the vent holes in the recessed structures, the waterproof effect is realized on the premise of ensuring ventilation, the electric leakage and ignition of the motor can be effectively prevented, and the lifetime of the motor of the box fan is extended.

Abstract: A driving assembly includes a motor bracket, a first driving motor arranged on the motor bracket, a spherical crank, and a second driving motor arranged on the motor bracket and spaced apart from the first driving motor. The spherical crank includes a connecting pillar and a ball head. One end of the connecting pillar is connected with an output shaft of the first driving motor. The ball head is arranged at another end of the connecting pillar. A sphere center of the ball head is not on a rotation axis of the connecting pillar. The second driving motor includes an output shaft arranged at a first end of the second driving motor and configured to be connected with a fan blade. A second end of the second driving motor is rotatably connected with the ball head.

Abstract: A rear guard of a box fan comprises: a body arranged vertically and a waterproof part arranged on the body. The waterproof part is arranged in a position corresponding to a motor in the box fan and the waterproof part comprises a plurality of recessed structures arranged on the body. a plurality of vent holes are arranged on the body for communicating an inner side of the body with an outer side of the body are arranged in the recessed structures. By arranging the vent holes in the recessed structures, the waterproof effect is realized on the premise of ensuring ventilation, the electric leakage and ignition of the motor can be effectively prevented, and the lifetime of the motor of the box fan is extended.