How does the filtration system of a floor vacuum cleaner ensure fresh air?

The filtration system of a modern floor vacuum cleaner usually adopts a multi-layer structure design. The first is the primary filter layer, which is mainly responsible for intercepting larger particles of dust, hair and debris. It is like a solid line of defense, preventing large particles of impurities from directly entering the subsequent filtration process, avoiding damage to more delicate filtration components, and also preliminarily filtering some pollutants in the air to reduce the pressure of subsequent filtration.
Next is the medium-efficiency filter layer, which has a higher filtration accuracy than the primary filter layer. It can capture some smaller dust particles and some allergens, such as pollen, dust mites and other tiny substances. The medium-efficiency filter layer uses special fiber materials. These fibers are interwoven to form a fine filter structure. Dust particles will be adsorbed or intercepted by the fibers when passing through, thereby effectively purifying the air, reducing the content of inhalable particles in the air, and protecting the user's respiratory health.
The high-efficiency filter layer is the core part of the entire filtration system. Common high-efficiency filters such as HEPA filters can filter out extremely small particles, including bacteria, viruses and some harmful chemical particles. The HEPA filter has a very high filtration efficiency and can remove more than 99.97% of the tiny particles in the air. The principle is that through the complex fiber structure and electrostatic adsorption, the tiny particles are firmly adsorbed on the filter fiber surface when passing through, and cannot escape into the air. In this way, the air discharged from the vacuum cleaner greatly reduces the content of pollutants and becomes fresh and clean.
In order to ensure the continued effectiveness of the filtration system, some vacuum cleaners are also equipped with automatic cleaning or reminder to replace the filter. During the operation of the vacuum cleaner, dust will gradually accumulate on the filter. If it is not cleaned or replaced in time, the filtration efficiency will decrease, the air freshness cannot be guaranteed, and it may even cause the vacuum cleaner's suction to weaken. The automatic cleaning function can shake off some of the dust adsorbed on the filter through reverse airflow or vibration, thereby extending the service life of the filter; and the reminder to replace the filter function can promptly inform the user of the use status of the filter so that the user can replace the new filter at the right time to maintain the good performance of the filtration system.
In addition, the sealing design of the vacuum cleaner is also of great significance to the guarantee of air freshness. A good sealing structure can prevent unfiltered air from leaking, ensuring that all inhaled air undergoes a complete filtration process, avoiding incomplete cleaning and air pollution problems caused by air leakage.