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The working principle of air filter

Views:2     Author:Shandong snyli     Publish Time: 2020-07-03      Origin:Site

air filter

working principle

air filterThe compressed air flowing in from the inlet is introduced into the baffle. The baffle has evenly distributed oblique teeth similar to fan blades, forcing the high-speed flowing compressed air to produce a strong rotation along the tangent direction of the teeth, mixing in the air The liquid water, oil and larger impurities are separated under the action of strong centrifugal force, thrown on the inner wall of the water cup, and flow to the bottom of the water cup. The compressed air, which removes liquid water, oil and larger impurities, is further filtered by the filter element to remove tiny solid particles, and then clean compressed air is output from the outlet. The umbrella-shaped water baffle divides the water cup into upper and lower parts, and the lower part maintains a static pressure zone, which can prevent the high-speed rotating airflow from sucking up the water and oil at the bottom of the cup. The water and oil accumulated at the bottom of the cup are discharged from the drain valve.air filterThe water cup must be installed vertically downwards.

Collapse edit this paragraph related principles


1. Intercept


Dust particles in the air move with the airflow in inertial motion or irregular Brownian motion or under the action of a certain field force. When the motion of particles hits other objects, the van der Waals forces (which are molecules and molecules, molecular clusters and The force between the molecular clusters) makes the particles stick to the fiber surface. The dust entering the filter medium has more chances to hit the medium, and it will be stuck when hitting the medium. Smaller dusts collide with each other to form larger particles and settle, and the particle concentration of dust in the air is relatively stable. The fading of the interior and walls is for this reason.

It is wrong to treat the fiber filter like a sieve.


2. Inertia and diffusion


Particle dust moves inertially in the airflow. When it encounters disorderly arranged fibers, the airflow changes direction, and the particles deviate from the direction due to inertia and hit the fibers to be bonded. The larger the particle, the easier it is to hit.

Small particles of dust make irregular Brownian motion. The smaller the particles, the more violent the irregular movement, the more chances of hitting obstacles, and the better the filtering. Particles smaller than 0.1 microns in the air mainly make Brownian motion, and the particles are small and filter well. Particles larger than 0.3 microns are mainly inertial motion, the larger the particle, the higher the efficiency


3. Electrostatic effect


For some reason, fibers and particles may be charged and generate electrostatic effects. Filtering with electrostatic filter materials can be improved. Reason: Static electricity makes the dust change its trajectory and hit obstacles, and static electricity makes the dust stick to the medium more firmly.

Materials that can hold static electricity for a long time are also called \"electrets\" materials. After the material is charged with static electricity, the resistance remains unchanged and the filtration is improved. Static electricity does not play a decisive role in filtration, but only plays an auxiliary role.


4. Chemical filtration


Chemical filterIt mainly selectively adsorbs harmful gas molecules.

There are a large number of invisible micropores in the activated carbon material and a large adsorption area. In activated carbon the size of rice grains, the area of the micropores is more than ten square meters.

After the free molecules contact the activated carbon, they condense into liquid in the micropores and stay in the micropores due to the capillary principle, and some are integrated with the material. The adsorption without chemical reaction is called physical adsorption.

Some processes the activated carbon, and the adsorbed particles react with the material to generate solid matter or harmless gas, which is called Huai Xue adsorption.

The adsorption capacity of the activated carbon material is constantly weakened during use, and when it weakens to a certain level, the filter will be scrapped. If it is only physical adsorption, heating or steam fumigation can remove harmful gases from activated carbon and regenerate activated carbon.


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