Inertial impactor with wetted impaction surface to prevent particle loading effect

Abstract

The invention discloses an inertial impactor with a wetted impaction surface to prevent the particle loading effect. The inertial impactor can prevent the particle loading effect and is composed of anupper shell, an impacting part, and a lower shell. The upper shell is provided with an air inlet and a round nozzle that is connected to the air inlet. The impacting part comprises an impacting well,and the lower part of the impacting well is an impacting surface. The nozzle is right opposite to and is above the center of the impacting surface. The center of the impacting surface is provided with a liquid inlet. Liquid is continuously or intermittently introduced to the impacting surface so as to wet the impacting surface and remove particles, at the same time, the liquid is discharged froma liquid discharge route in the impacting surface, and the lower shell is provided with an air outlet channel, which is connected to a particle sampling or monitoring device.

Description

technical field [0001] The present invention relates to a particle impactor, and more particularly, to a particle impactor that reduces the effects of particle loading effects. Background technique [0002] As more and more nano products come out, nanoparticles may escape or be released during the process of manufacture and use. Many research results show that nanoparticles inhaled by the human body will affect health. In order to assess the health hazards of nanoparticles in the workplace to relevant practitioners, it is necessary to collect nanoparticles of different particle sizes and conduct subsequent component analysis. . [0003] Particle impactor is an existing particle collection device. When the air flow passes through the nozzle and hits the impact plate downward, the air flow makes a 90-degree turn because the gas cannot pass through the impact plate, so it is larger than the specific aerodynamic particle size (or intercepted particle size) particles, which can...

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Problems solved by technology

[0004] However, as the sampling time increases, a particle mound or particle deposit will gradually form on the impact plate below the nozzle, so that the subsequent collected particles will hit the previously accumulated particles instead of the impact surface, which may result in less than a specific aerodynamic force. Particles of that size are collected, resulting in a decrease in the interceptor diameter of the impactor, resulting in an underestimation of particle sampling or monitoring concentrations downstream of the impactor

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