Patent ID: 9651038
Date: 2017-05-16
CPC Classifications: F04B,G01N

Claim:
1. A particle suppressing air flow system for an air sampling instrument requiring continuous air flow therethrough comprising: a housing having a sealed volume with an entrance air inflow port and an exit airflow port; an air pump having a non-uniform pumping characteristic, the pump occupying a portion of the volume of the housing in a sealed manner, the unoccupied portion of the volume constituting a surge chamber, and having an air inlet spaced from the entrance air inflow port and having an outlet connected to the exit airflow port, the pump having the non-uniform pumping characteristic that reduces pressure to a first pressure in the surge chamber below a second pressure outside of the housing; and the air sampling instrument associated with a flowmeter connected to the air inflow port of the sealed housing; whereby the non-uniform pumping characteristic of the pump is damped by the surge chamber to produce uniform, continuous air flow through the air sampling instrument.