The air filters in the fresh air purifier rely primarily on the combined effects of various physical and chemical mechanisms to effectively remove pollutants from the air. Here are several key filtration principles:
Mechanical Filtration
- Interception Effect: The intricate arrangement of fibers within the air filter forms countless grids. When particles (such as dust, pollen, bacteria, etc.) travel with the airflow near the fiber surface, if the distance from the particle to the fiber surface is equal to or less than the particle's radius, the particle will be intercepted and deposited on the fiber.
- Inertial Action: As airflow passes through the fiber layer, the complex arrangement of fibers causes the airflow streamlines to frequently change direction. Particles with larger masses or faster speeds, due to their inertia, cannot follow the streamlines around the fibers in time, resulting in them deviating from the streamlines and colliding with the fibers to deposit.
- Diffusion Effect: The thermal motion of gas molecules causes particles, especially tiny ones, to undergo Brownian motion. This motion increases the chances of particles coming into contact with the fiber surface, thereby enhancing filtration efficiency.
Activated Carbon Adsorption
Activated carbon is a material with a highly porous structure and powerful adsorption properties. In fresh air purifiers, by filling or coating with activated carbon material, it can adsorb harmful gases such as organic compounds, odors, and formaldehyde from the air. Activated carbon's enormous adsorption surface area and porous structure enable it to adsorb and decompose harmful gases through chemical adsorption, achieving the purpose of purifying the air.
Electrostatic Precipitation
Some fresh air purifiers employ high-voltage electrostatic precipitation technology. This technology utilizes electric field forces to charge dust particles in the air, which are then directed to a collection plate by electrode plates. The charged particles are effectively removed under the action of electric field forces, thus purifying the air of fine particulate matter.
Other TechnologiesIn addition to the above primary filtration principles, some fresh air purifiers may also adopt other technologies to enhance purification effectiveness, such as:
- Ultraviolet Disinfection: Utilizing ultraviolet rays to destroy the DNA structures of bacteria and viruses, achieving the purpose of disinfection and sterilization.
- Ozone Disinfection: Ozone, as a strong oxidant, can effectively remove odors and organic compounds.
In summary, the air filters in fresh air purifiers utilize a combination of mechanical filtration, activated carbon adsorption, electrostatic precipitation, and other principles to effectively remove and purify pollutants from the air. Each of these technologies has its unique characteristics, collectively contributing to the powerful air purification capabilities of fresh air purifiers.
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