Cyclone desander with central air guide pipe

The utility model discloses a cyclone desander with a central air guide pipe, belonging to a solid-liquid separator and being an improved hydrocyclone desander researched aiming at high-efficient desanding on rivers with higher sand content or other water sources. The cyclone desander with the central air guide pipe comprises a cavity, a feed pipe, an overflow pipe and a bottom flow pipe, wherein the cavity consists of a cylindrical cavity at the upper section, a large conical cavity at the middle section and a small conical cavity at the lower section; the feed pipe is connected in from the side wall of the cylindrical cavity of the upper section, the bottom of the small conical cavity at the lower section is connected with the bottom flow pipe, and the overflow pipe is upwards connected out from the center of the cylindrical cavity at the upper section; the central air guide pipe is additionally arranged at the central axis position of the cyclone desander, the lower end of the central air guide pipe is ope