Princeple:

A vacuum cleaner is an electrical appliance that uses the characteristicsof smaller objects to move from a high-pressure area to a low-pressurearea to suck away dust and dry dirt from floors, carpets, walls, furnitureand other surfaces that are not easy to clean with a broom. Its maincomponents are vacuum pump, filter bag (or filter net), hose, extensiontube and nozzles of various shapes. Vacuum pumps generally use centrifugal fans to create low-pressure areas, and centrifugal fans are thecore components of vacuum cleaners.