The working principle of a vacuum cleaner is that the motor of the vacuum cleaner rotates at high speed and sucks in air from the suction port, creating a certain vacuum in the dust box. Dust enters the filter bag in the dust box through the floor brush, connecting pipe, handle, hose, and main suction pipe. The dust is left in the filter bag, and the filtered air enters the motor through a layer of filter plates. This layer of filter plates is a protective barrier to prevent the dust bag from breaking and dust from being sucked into the motor, The air entering the motor flows out through the motor, and due to the continuous wear and tear of the carbon brush during the operation of the motor, another filter is added before it flows out of the vacuum cleaner. The finer the filtering material, the cleaner the air can be filtered, but the lower the air permeability, which affects the air volume sucked in by the motor and reduces the efficiency of the vacuum cleaner. But for users, comfort and cleanliness are the main priority. Its breathability is low, so it is made into a wavy shape to increase the breathable area. Some of these filtering materials can also be cleaned repeatedly. Any filtering material has a "lifespan", which means that after long-term use, the micropores of the filtering material have been blocked by small particles of dust. Therefore, paper dust bags are ideal, disposable after use, hygienic and convenient. After cleaning the cloth dust filter bag, the fibers will harden, affecting the filtration and breathability effects. SMS three-layer composite filter material is washable, but has slightly lower air permeability. Product classification: Horizontal vacuum cleaners are commonly used in the Asian and European markets by shape, accounting for over 80% of the overall market. Its characteristic is its compact appearance and convenient storage. Horizontal vacuum cleaners are also divided into "dust box vacuum cleaners" and "dust bag vacuum cleaners". Vertical American markets are common and suitable for large-scale carpet cleaning. The handheld model is compact and very convenient to carry and use. It is mainly used for cleaning the car interior and has good effects on keyboards, appliances, etc. The disadvantage is that the power is small and the suction is not strong enough. Bucket type commercial vacuum cleaners are mostly used by cleaning companies, hotels, and office buildings, characterized by large capacity and the ability to absorb water. The push rod type is gradually increasing, mostly rechargeable, characterized by its compact size and convenient use. By function, robots automatically clean the dust on the floor, hair and debris, and automatically return to charging after the cleaning task is completed. The core technology of intelligent vacuum cleaners is the chip and software inside. High end vacuum cleaner, which can automatically clean and charge, has the advantages of low noise, small size, and easy access to areas that traditional vacuum cleaners cannot reach. Portable vacuum cleaners generally come in four forms: shoulder type vacuum cleaners: small in size, carried on the shoulder when used, with low power output. Rod vacuum cleaner: shaped like a rod, with a handle at the upper end and a suction nozzle at the lower end, with a low power output. Portable vacuum cleaner: smaller in size, can be used directly in the hand, with low power output. Micro vacuum cleaner: Multi battery powered, smaller in size, commonly used for cleaning clothes, instruments, etc., with low power