Concentration sampling head and concentration sampler for cyclonic microbial aerosol collection

Abstract

The invention discloses a concentration sampling head for cyclonic microbial aerosol collection. The sampling head comprises a shell, a virtual impact acceleration sieve mesh assembly and a fan; a small flow cavity and a main flow cavity which are separated from each other are formed in the shell; the virtual impact acceleration sieve mesh assembly sucks aerosol in a cyclone type acceleration manner, obtains large-particle aerosol and small-particle aerosol by sieving, and conveys the large-particle aerosol and small-particle aerosol to the small-flow cavity and the main flow cavity respectively; and the fan is mounted in the main flow cavity, sucks the small-particle aerosol from the air inlet in an accelerated manner, and discharges the small-particle aerosol through the main flow exhaust port. Compared with the prior art, the concentration sampling head is small in size, convenient to carry, low in energy consumption, large in collection suction and capable of forming cyclone airflow to be input into a concentration sampling head. The invention also discloses a concentration sampler for cyclonic microbial aerosol collection.

Description

technical field [0001] The invention relates to microbial aerosol sampling, in particular to concentrated sampling of microbial aerosol. Background technique [0002] Microbial aerosols refer to particles within the particle size range of 1-100 μm, which contain bacteria, fungi, spores, pollen, viruses, organic substances secreted by active organisms, and plant or animal fragments and debris. They are microorganisms suspended in the air. The colloidal system formed. There are a large number of microbial aerosols in nature, and microbial aerosols with a particle size of 0.1-20.0 μm are closely related to human health. It is of great significance to study and monitor the concentration, type, distribution and changing law of air microbial aerosols. [0003] Referring to Chinese patent CN201210103840, the existing aerosol concentration sampler generally adopts a vacuum pump for dual-channel sampling, which extracts the gas in the small-flow gas circuit and the main-flow gas ci...

AI Technical Summary

Problems solved by technology

In order to ensure that the sampling flow rate of the main flow gas path and the small flow gas path is large enough, a vacuum sampling unit above 10KG must be used for sampling, which not only makes the entire sampling device bulky and difficult to carry, but also requires an external power supply when sampling. power supply

On the other hand, due to the insufficient suction at this type of sampling head, it is necessary to shorten the sampling distance of the main flow when sampling, and an aluminum sampling head must be used with a very long sampling tube (about 3 meters) to connect to the main flow gas path Such a sampling tube of about 3 meters will cause a large pressure drop on the main air circuit, resulting in that even if the flow rate of the vacuum sampling pump in the main circuit is sufficient, it cannot meet the demand for the large flow preset value of the sampling head; it cannot Real feedback of the real situation of the actual sampled air, in addition, the long sampling tube is not conducive to cleaning, disinfection, replacement, carrying and other issues

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