Hydrocyclone

Cyclone separator or hydrocyclone for separation of solid particles from a liquid comprising a substantially cylindrical hollow body having a lower portion which is conically tapered and terminates in an opening for discharge of liquid enriched with respect to solid particles, the upper end of said hollow body being provided with at least one inlet opening having a bore and an annular outlet for purified liquid, said inlet opening being provided with a short nozzle having a bore (A), the diameter of the bore of said inlet opening in front of said nozzle being larger or equal to twice the diameter of the bore (a) of said nozzle, the diameter (B) of the bore of said inlet opening behind said nozzle being at least 1.3 times the diameter of the bore (A) of said nozzle, the length (D) of said nozzle not exceeding the diameter (A) thereof and the length of curvature (E) of said nozzle being less than 1.5 times and larger than 0.75 times the diameter (A) of said nozzle, and said annular outlet being defined between a centrally disposed body and an annular guiding tube located in the upper end of said hollow body, said annular guiding tube having an external diameter (D.sub.2) in the range of 0.72 (D.sub.3) and 0.83 (D.sub.3) in respect to the inner diameter (D.sub.3) of said cyclone separator.