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Asymmetric fiber media structure for HEPA filters
Asymmetric fiber media structure for HEPA filtersThe core technology of high-efficiency automatic gradient density fiber filter is to use asymmetric fiber bundle material as the filter media, with loose fiber bundles at one end and fiber bundles fixed in the solid body of larger specific gravity at the other end. During filtration, the solid nucleus of larger specific gravity plays a role in the compression density of the fiber bundles, and at the same time, due to the smaller size of the nucleus, it does not have much effect on the uniformity of the distribution of the void rate of the filtered cross-section, thus improving the filter bed's Interceptor capacity.So the filter bed has the advantages of high porosity, small specific surface area, high filtration speed, large dirt intercepting capacity, high filtration precision of fiber filtration, etc. When the suspended matter in the water flows through the surface of fiber filter media, under van der Waals' gravitational force and the effect of electrostatic force, the adherence between the suspended solid and fiber bundles is much larger than that with quartz sand, which is conducive to the improvement of filtration speed and filtration precision. When backwashing, due to the specific gravity difference between the core and the fiber filaments, the comet tail fiber disperses and swings with the backwashing water flow, generating a strong flinging force; the mutual collision between the filter media also aggravates the mechanical force of the fiber in the water, and the irregular shape of the filter media makes the filter media rotate under the action of the backwashing water flow and airflow, which strengthens the mechanical shear force of the filter media during backwashing, and the joint action of the above several forces results in The combined effect of the above forces makes the solid particles attached to the surface of the fiber easy to fall off, thus improving the washing degree of the filter media, so that the asymmetric fiber filter media has the backwashing function of the granular filter media at the same time. |
