Principle of precision filter filtration:
1. Diffusion deposition:
Due to Brownian motion, the motion trajectory of each fine particle is inconsistent with the flow direction of compressed air. As the particle size decreases, the intensity of Brownian motion increases, the probability of collision of fine particles with fiber is greater, and the diffusion deposition is stronger.
2, direct interception:
This principle is related to the size of the particles, which are intercepted when the gap between the fibers is smaller than the diameter of the particles.
3. Inertial deposition:
When the compressed air passes through the fiber, the streamline will bend. Due to the inertia, the particles in the compressed air are not thrown onto the fiber and are deposited there without following the curved streamline. Obviously, this kind of surname will increase with the particle size. The increase in the flow rate of the large and compressed air is enhanced.
4. Gravity deposition:
Various particles have a certain settling velocity due to the action of gravity. Therefore, the trajectory of the particles deviates from the flow line of the compressed air, and this deviation causes the particles to hit the fibers.
5, electrostatic deposition:
Both particles and fibers are likely to be charged, so particles can deposit on the fibers due to the force or inducing force between the charges.
6. Van der Waals sediment:
When the distance between the particles and the fibers is small, the van der Waals intermolecular forces can cause particle deposition.
Due to the simultaneous effects of the above several filtration principles, the filtration efficiency of the precision filter can be made 99% or more.
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