Sealing device for dust- and liquid-aspirating machines

A sealing device for dust- and liquid-aspirating machines, comprising an electric motor with a shaft to a cantilevered free end whereof an axial suction impeller is fixed, said impeller being contained in a casing wherein one or more delivery ducts are formed peripherally, said device further comprising an axially perforated disk-shaped element associated with said shaft, interposed between said motor and said casing, and provided with a perimetric surface which is shaped so as to form at least two successive tapering portions between which a change in diameter is interposed and forms a step, the configuration of said disk-shaped element being adapted to repel the liquid by centrifugal action and to dissipate its energy in association with a facing surface of a flanged sealing element having a hollow section that encapsulates part of said electric motor, and a flange connected to said casing upon assembly, said disk-shaped element being shaped so as to form a perimetric ridge affecting at least a first one of, said at least two tapering portions, which cantilevers out with respect to a main plane of arrangement of said disk-shaped element, and said first tapering portion being inserted, upon assembly, in an annular slot which is coaxial to said shaft and is formed in said flanged sealing element.