Patent ID: 9086341
Filing Date: 2015-07-21
Classification: G01N

Abstract:
1. A multi-filter PM10-PM2.5 sampler comprising: a PM 10 impactor; a branch pipe having a to end, a left end, and a right end, the to end being connected with the PM 10 impactor; a PM 10 flow splitter having a plurality of outlets and an inlet connected with the left end of the branch pipe; a plurality of PM 10 filter devices connected with the outlets of the PM 10 flow splitter, each PM 10 filter device having a sampling channel; a PM 2.5 impactor connected with the right end of the branch pipe; a PM 2.5 flow splitter having a plurality of outlets and an inlet connected with the PM 2.5 impactor; a plurality of PM 2.5 filter devices connected with the outlets of the PM 2.5 flow splitter, each PM 2.5 filter device having a sampling channel, each sampling channel having a pressure drop; a conflux assembly; a plurality of flow uniformization devices connected between the PM 10 filter devices and the conflux assembly and between the PM 2.5 filter devices and the conflux assembly for enhancing the pressure drop of each sampling channel so as to lower a relative difference in the pressure drop of the sampling channels; and an air pump connected with the conflux assembly; wherein each of the flow uniformization devices has an orifice plate with a through hole; wherein each of the flow uniformization device further comprises an upper member and a lower member, the upper member having an axial hole, the axial hole having a smaller-diameter portion, a larger-diameter portion, and a threaded part, the larger-diameter portion being located between the smaller-diameter portion and the threaded part for receiving the orifice plate, the lower member having a threaded portion and an axial hole located inside the threaded portion, the threaded portion engaging with the threaded part of the axial hole of the upper member, the axial hole of the lower member communicating with the smaller-diameter portion of the upper member via the through hole of the orifice plate.