The basic working principle of a wet/dry vacuum cleaner is similar to that of a regular vacuum cleaner, relying on a motor-driven fan to generate negative pressure (suction) to draw in air and debris. The key difference lies in the addition of a liquid separation device. A common design uses a centrifuge chamber for solid-liquid-gas separation. When dust, air, and water are drawn into the centrifuge chamber, the heavier water is thrown against the inner wall of the chamber by the centrifugal force generated by high-speed rotation, and then flows into the collection tank below; while the lighter dust and air enter the subsequent filter bag for fine filtration.
Another key technology is the protective design for foamy wastewater, such as the use of a float and float body mechanism. When wastewater is drawn in, the float body is pushed up by the buoyancy of the liquid until the float closes the air inlet, thus preventing foam from being drawn into the filter screen along the air duct, effectively avoiding secondary pollution.
