The invention provides a hydro-
cyclone with the flow channel screw
pitch adjustable. By means of the hydro-
cyclone with the flow channel screw
pitch adjustable, the problem that when different workingconditions are coped with by a single-type hydro-
cyclone, the separating effect is poor is solved. The hydro-cyclone with the flow channel screw
pitch adjustable is characterized in that a screw pitch-variable
spiral flow channel module and an adjustable and regulatable inverted-cone module are arranged in a
diameter-variable separating
pipe; four columns of annular gap grooves are formed in thebottom of the
diameter-variable separating
pipe, each column of annular gap grooves comprise three annular gap grooves, and the annular gap grooves are distributed in a circumferential manner on the inner surface with the mutual included angle being 120 degrees; the screw pitch-variable
spiral flow channel module comprises an inner-driven spiral column, an outer cylinder, limiting sliding blocks,sliding block nails, a trapezoid belt, a marking rotary knob, a square sealing ring and a sealing cover; the inner-driven spiral column and the outer cylinder are connected by the limiting sliding blocks and the sliding block nails; the limiting sliding blocks and the sliding block nails slide left and right in an outer cylinder groove through rotating the inner-driven spiral column, and the trapezoid belt is driven to move by the limiting sliding blocks; and the adjustable and regulatable inverted-cone module comprises a
diameter-variable inverted cone, a circular ring-shape rotary knob, connecting rods, extending-and-contracting clamping columns and connecting pins, and the extending-and-contracting clamping columns are adjusted through rotating the circular ring-shape rotary knob.