Centrifugal liquid cleaner

A centrifugal liquid cleaner comprising:

• a base;
• a vertical hollow axle fixed rigidly on said base and provided with an inlet for the incoming liquid and an outlet for the cleaned liquid;
• a cylindrical rotor mounted rotatably on said hollow axle;
• a rotation drive of said cylindrical rotor;
• said cylindrical rotor comprising a bushing arranged coaxially with said hollow axle, a band secured at one end on said bushing and wound in a helix, spacers located radially one after another between the adjacent turns of the helix of said band, parallel with said hollow axle, gaps for the passage of the liquid, formed by said spacers and said band;
• one impeller located at the lower end of said bushing and connected to it for joint rotation, another impeller located at the upper end of said bushing and connected with it for joint rotation, each said impeller consisting of a disc and ribs secured on said disc at equal angular distances, said spacers secured by their edges in the ribs of said two impellers;
• discs of said impellers made and secured in such a manner that the distance between each disc and the corresponding edge of the helix of said band satisfies the condition:
• ##EQU5## where:
• .sub. = distance between the disc of one of said impellers and the corresponding edge of the band helix;
• .sub. = distance between the disc of the other one of said impellers and the corresponding edge of the band helix;
• R=maximum radius of the helix of said band;
• r=current radius of the helix of said band;
• r.sub.o =minimum radius of the helix of said band;
• such an arrangement of said discs relative to the edges of the helix of said band ensuring an optimum distribution of liquid flow velocities in said gaps, a casing connected with said two impellers, enclosing said bushing with the band and, both impellers and chambers which are located between the ends of said bushing with said band and said two impellers and communicate, respectively, with the liquid inlet and outlet in said hollow axle, said chambers communicating with each other through said gaps, a pressure disc mounted in said casing on said hollow axle above the other impeller.