Principle of air filters

Collision and stick

Dust particles in the air, or coasting with the flow, or do random motion, or by some kind of field force and movement. When the movement of the particles hit the obstacle, the van der Waals forces between the particles and the obstacle surface so that they stick together.air filter bag


Fiber filter material
The filter material should be able to: effectively intercept dust particles, the air flow without much resistance. Non-woven fibers and special paper meets this requirement. Intricately interwoven fibers formed numerous dust barrier between the fibers spacious space allows air flow through smoothly.

The principle of inertia

Inertial motion of large particles in the gas stream. Airflow Obstacle bypass particles deviate from the direction of air flow due to inertia and hit the obstacle. The larger the particle, the stronger the force of inertia, the greater the possibility of colliding with obstacles, so the better the filtering effect.

Diffusion theory

Small particles random Brownian motion. For mathematical processing of the irregular movement and mass diffusion theory, diffusion theory said. The smaller the particles, the random motion of the more dramatic, the more chance of colliding with obstacles, so the better the filtering effect.bag filter

Efficiency varies with the size of dust particles
The filters trap amount of dust and unfiltered the ratio of the amount of dust in the air is "filtration efficiency". Less than 0.1um (micron) particle for diffusion motion, the smaller the particle, the higher the efficiency; greater than 0.5um particles for inertial motion, the larger the particle, the efficiency of Zhao Gao. Between 0.1 ~ 0.3um, the efficiency of a the lowest point, the particle size of dust, the most difficult to filter.

Resistance

Fiber bypass airflow, resulting in a slight resistance. Resistance of numerous fiber is the filter resistance. Filter resistance increased with increasing gas flow through the filter of the relative wind speed can be reduced by increasing the area of ​​the filter material, to reduce the resistance of the filter.

Dynamic performance

The dust capture additional resistance to air flow, so, use the filter gradually increasing resistance. Capture dust filter media together as one to form a new obstacle efficiency of filtering, a slight improvement.

And capture most of the dust gathered in the windward side of the filter material. Greater filter area, more dust can accommodate, the longer the life of the filter.

End-of-life of the filter

More dust filter, the greater the resistance, filter life coming to an end when the high resistance to design not allowed. Sometimes, too much resistance causes the filter to capture dust flying, this risk, the filter and the scrap.

Static electricity

If the filter material with electrostatic powder with electrostatic filter effects can be significantly improved.

The reason: the static electricity the dust trajectory and make changes into obstacles, static electrostatic force stuck.