Coupling induced draft fan unit

The embodiment of the utility model provides a coupling induced draft fan unit, and relates to the technical field of coupling induced draft fan units. The coupling induced draft fan unit comprises a torque transmission shaft, a main bearing is installed on the right side of the surface of the torque transmission shaft, and impeller hubs are installed on the surface of the torque transmission shaft and located at the two ends of the main bearing; according to the device, the first-stage impeller hub is additionally arranged, the two-stage impeller hubs are connected in series through the push rod and the push disc, the push rod is installed in the hollow shaft of the main bearing box and can be adjusted during installation and overhaul, and due to the fact that the front-stage impeller hub and the rear-stage impeller hub are connected in series, the reliability of the front-stage impeller hub and the rear-stage impeller hub of the device is high; due to the fact that the blades of the single-stage adjustable