Patent ID: 9616369
Date: 2017-04-11
CPC Classifications: B01D,G01N

Claim:
1. An inertial filter to be disposed in an air flow path for a stream of air containing nanoparticles having particle sizes equal to or smaller than 100 nm to pass through, the inertial filter being configured to collect the nanoparticles in the air flow path by utilizing an effect of particle inertia, the inertial filter collecting configured to collect the nanoparticles having smaller particle sizes as a flow velocity of the stream of air increases, the inertial filter comprising: a plurality of flow adjusting nozzles each having a different number of through cavities or having a through cavity diametrically reduced by a different diameter ratio, one of the flow quantity adjusting nozzles being located on an upstream side of the air flow path containing nanoparticles having particle sizes equal to or smaller than 100 nm; and a plurality of particle classifying sheets stacked and located on each other in a manner that the plurality of particle classifying sheets seal a whole surface of a downstream-side opening of the through cavity of the flow quantity adjusting nozzle; wherein each of the flow quantity adjusting nozzles is configured to be replaceable with another of the flow quantity adjusting nozzles having a different number of through cavities or having a through cavity diametrically reduced by a different diameter reducing ratio to allow for adjustment of the flow velocity, thereby strengthening inertia collection while weakening diffusion collection; and wherein the plurality of particle classifying sheets comprises a plurality of holes and mesh portions defining the plurality of holes so that the plurality of holes constitute meshes whose mesh aperture is larger than the particle size of the nanoparticles in order to classify the nanoparticles; and wherein the plurality of particle classifying sheets are configured to adjust a shadow area ratio on of a projected part relative to whole area of a projection view obtained by virtually projecting the plurality of particle classifying sheets from a downstream side to an upstream side of the air flow path to a value greater than 0.32 to thereby increase collection efficiency of the nanoparticle at the projected part.