Low-resistance bypass structure

The utility model relates to the technical field of bypass structures, in particular to a low-resistance bypass structure which comprises a booster fan body, a limiting plate and a screw rod, an air inlet pipe is installed on one side of the booster fan body in an embedded mode, and a bypass pipe is installed at the end, away from the booster fan body, of the air inlet pipe through a flange plate. A supporting column is welded to the bottom end of the interior of the bypass pipe, a bearing plate is welded to the top of the supporting column, a motor is placed at the top of the bearing plate, fan blades are installed at the transmission end of the motor in an annular array mode, a bearing is installed at the top of a limiting plate, a screw hole is formed in the top of the bypass pipe, and the screw and the screw hole are connected in an engaged mode. And the bottom of the screw rod is fixedly connected with the inner ring of the bearing. The device has the advantages that the flow speed of waste gas is increa