Personal nanoparticle sampler
View Patent ↗A personal nanoparticle sampler is disclosed to include a pre-classifier, a nozzle, a connector and a final filter pack. The connector and the final filter pack respectively accommodate a particle-sizing filter and a final filter to collect nanoparticles smaller than a diameter. The pre-classifier removes large particles to avoid clogging of the connector. The nozzle raises the airflow velocity to reduce the cut-off diameter of the particle-sizing filter without increasing the total flowrate, allowing the personal nanoparticle sampler to be used with a personal sampling pump.
1. A personal nanoparticle sampler comprising:
a pre-classifier having a first chamber and an air inlet extending from the said first chamber to the outside of the said pre-classifier;
a nozzle connected to said pre-classifier, the said nozzle having a passage disposed in connection with the said first chamber of the said pre-classifier, the said passage having a cross section gradually reducing in the direction apart from said first chamber;
a connector connected to one end of the said nozzle opposite to the said pre-classifier, the said connector having a second chamber disposed in connection with the said passage of the said nozzle;
a final filter pack connected to the said connector, the said final filter pack having a third chamber and a suction passage, the said third chamber disposed in connection with the said second chamber of the said connector, the said suction passage extending from the said third chamber to the outside of the said final filter pack; and
a rack having a top plate, two sliding rods, a bottom plate, and two springs, the said top plate being stopped outside the said final filter pack, the said sliding rods being connected to the said top plate, the said bottom plate being coupled to the periphery of the said pre-classifier and movable along the said sliding rods, the said springs being bilaterally connected between the said top plate and the said bottom plate.
2. The personal nanoparticle sampler as claimed in claim 1 , wherein the connector further comprises a filter support mounted in the second chamber, the filter support having a plurality of perforations, particles which flow into the nozzle moving along an axis of the passage of the nozzle until passing through the perforations of the filter support.
3. The personal nanoparticle sampler as claimed in claim 1 , wherein the said pre-classifier is a cyclone separator, and the said first chamber is comprised of a conical portion and a cylindrical portion.
4. The personal nanoparticle sampler as claimed in claim 1 , wherein the said final filter pack comprises a top cover, a bottom cover, and a connector, the said top cover and the said bottom cover defining therein the said third chamber, the said connector defining therein the said suction passage.
5. The personal nanoparticle sampler as claimed in claim 1 , further comprising a particle-sizing filter mounted in the said second chamber of the said connector.
6. The personal nanoparticle sampler as claimed in claim 5 , wherein the said particle-sizing filter is a polycarbonate track etch membrane.
7. The personal nanoparticle sampler as claimed in claim 1 , further comprising a final filter mounted in the said third chamber of the said final filter pack.
8. The personal nanoparticle sampler as claimed in claim 1 , wherein the said passage of the said nozzle has a circular cross section and an outlet disposed at one end thereof remote from the said first chamber, the said outlet having a diameter smaller than 1.5 mm.
9. The personal nanoparticle sampler as claimed in claim 8 , wherein the diameter of the said outlet is within 0.6 mm˜1 mm.
10. The personal nanoparticle sampler as claimed in claim 1 , wherein the said passage of the said nozzle has an outlet disposed at one end thereof remote from the said first chamber, the said outlet having an airflow velocity of 85 m/sec˜165 m/sec.
11. The personal nanoparticle sampler as claimed in claim 10 , wherein the airflow velocity of the said outlet is within 110 m/sec˜115 m/sec.