Cyclone desander is carried out using the principle of centrifugal separation to remove sediment, since the inlet pipe is installed at an eccentric position of the cylinder, when the water inlet through cyclone desander first formed along the tangential direction around the barrel oblique the surrounding fluid, water swirling down the passage, when the water reaches a certain portion of the cone, turned up along the cylinder axis of rotation, the final outlet pipe discharge, miscellaneous dirt in the fluid inertia centrifugal force and gravity itself, along cone fall into the lower part of the conical wall surface equipment powder hopper, lower cone with a member to prevent debris thrown up when the accumulation of debris in the powder hopper to a certain extent, simply open the manual butterfly, debris can be in the water In addition to the role of the cyclone outflow sand traps. Cyclone desander is based on the principle of centrifugal sedimentation and density difference, when the water in the inlet under pressure from Desanding tangentially into the device, resulting in a strong rotation, due to the different densities of sand and water, the centrifugal force, joint action centripetal force, buoyancy and fluid drag forces, the low density of the water rises, discharged from the outlet, high density sand discharged from the outfall bottom of the device, so as to achieve the purpose of grit removal. Features 1, simple structure, easy to operate, safe, reliable, almost maintenance free. 2, and expansion of the tube, the buffer tank and other grit removal equipment, compared with a small size, large capacity, space-saving advantages of the site. 3, clear water, sand in the process of uninterrupted water supply. 4, to avoid the presence of other ways Desanding secondary pollution of water phenomenon, high grit removal efficiency.