High flow rate aerosol sampling apparatus

Abstract

The invention relates to a large-flow aerosol sampling device, which is characterized in that the aerosol sampling device mainly comprises a macroparticle cutter, a concentrating separator and a sampler. The macroparticle cutter comprises an inner tube, an outer tube, a top cap, an insect preventing net cover and an air flow output pipe, wherein a circle of air flow inlets are arranged between the outer tube and the top cap; an air flow spray nozzle is formed between the inner tube and the outer tube; the air flow output pipe is arranged in the insect preventing net cover and fixed on the tapered bottom surface of the outer tube. The aerosol concentrating separator comprises an outer shell, and an upper spray nozzle and a lower spray nozzle which are respectively arranged, wherein a ventilation clearance is reserved between the upper spray nozzle and the lower spray nozzle, so as to form a preliminary spray nozzle separated by small particles; ventilation clearances are reserved among the lower spray nozzle and the air flow inlets, so as to form a secondary spray nozzle. The aerosol sampling device has the advantages of simple structure and small volume, and can be used for the concentration, the separation and the real-time monitoring of biological aerosol in the atmosphere.

Description

technical field [0001] The invention relates to a large-flow aerosol sampling device, in particular to a combined virtual impact high-flow aerosol sampling device that can be used for the concentration and separation of biological aerosols in the atmosphere. Background technique [0002] With the accelerating process of economic globalization, new infectious diseases appear frequently around the world, public health emergencies occur from time to time, and the threat of bioterrorism becomes more prominent. Biosafety has become a serious threat to human life, national security and economic development. important question. Infectious viruses, bioterrorism weapons and other microorganisms exist in the atmosphere in the form of aerosol particles, so it is imperative to monitor the potential danger of particles in the atmosphere in real time. Experiments have shown that the diameter of microbial particles that can be transmitted in the air is generally more than 2 microns, and t...

AI Technical Summary

Problems solved by technology

This sampling device has the following deficiencies: 1. In order to prevent precipitation, insects, grass blades, flying catkins and other substances from being sucked into the large-flow aerosol sampler and block the air path, it is necessary to design a special rain cover and an insect-repelling net. The gas-proof, rain-proof and insect-repelling net cover, the large particle separator and the concentration separator are independent structures, and the volume and weight are large, which is inconvenient to install and use

2. Most of the large particle cutters are cyclone separators or solid impact plates, and there is a phenomenon of particle rebound

3. The inner cavity of the acceleration nozzle of the concentration separator is generally a combination of cylindrical and conical, which has a poor ability to shape the airflow streamline and has a large wall loss

4. The cyclone separator cannot effectively remove biological particles smaller than 2 microns

Images