Air duct sealing structure of primary and secondary scrubber

The utility model discloses an air duct sealing structure of a primary and secondary scrubber, which comprises a primary scrubber and a secondary scrubber, a butt joint groove is arranged on the primary scrubber, a butt joint ring and a butt joint rib are arranged at the bottom of the butt joint groove, the butt joint ring encloses an air outlet channel of the primary scrubber, and the butt joint rib encloses an air exhaust channel of the primary scrubber; an air inlet and an air outlet are formed in the bottom surface of the butt joint; the sub-machine is arranged in the butt joint groove through the butt joint of the sub-machine so as to be in butt joint with the master machine; the upper edge of the butt joint ring is of a flanging structure which is turned outwards, and after the son machine is installed in the mother machine, the air inlet and the air outlet in the bottom face of the butt joint head are in sealed butt joint with the butt joint ring and the butt joint rib in the butt joint groove respecti