Structural features 1, double-suction; double-sustain 2, motor and fan by type coupling 3, liquid dynamic pressure oil-film bearing support 4, the hydrodynamic oil-film bearing scraping for free 5, cone arc collector 6, backward curved impeller 7, serrated disc 8, installation of the wearing plate 9, streamlined flow regulating blade 10, conical hub 11, replaceable liner 12, floating carbon ring seals 13, electric barring device Plywood case
