Device and method for testing filtration efficiency of biologic aerosol for filtering or separating material

A bio-aerosol and filtration efficiency technology, applied in the field of air purification and bio-cleaning technology, can solve the problems of immobility, inability to meet, difficult to move, etc., to achieve the effect of short interval time, ensure accuracy, and high detection efficiency

Inactive Publication Date: 2008-11-05
SANITARY EQUIP INST ACAD OF MILITARY MEDICAL SCI PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The more prominent problems are that the test bench is bulky, difficult or impossible to move, the test of a certain sample often takes a long time to balance, the test efficiency is low, and the test conditions are single,

Method used

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  • Device and method for testing filtration efficiency of biologic aerosol for filtering or separating material
  • Device and method for testing filtration efficiency of biologic aerosol for filtering or separating material
  • Device and method for testing filtration efficiency of biologic aerosol for filtering or separating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The detection flow rate is 28.31 / min, the sampler is a six-stage impact Anderson sampler, the upstream sampling time is set to 30s, and the downstream sampling time is set to 5min, and a high-efficiency glass fiber filter paper is used as a sample to carry out four repeated detection experiments of bacteria filtration efficiency. As shown in the table below, the conditions used in this embodiment determine that the highest detection efficiency is 99.99%, and the value greater than this value is represented by ">99.99%".

[0045] Particle size range

Embodiment 2

[0047] The detection flow rate is 20, 28.3 and 401 / min, the sampler is a six-stage impact Anderson sampler, the upstream sampling time is set to 30s, and the downstream sampling time is set to 5min. An N95 mask is used as a sample for three tests. The results are shown in the table below. The conditions used in this embodiment determine that the highest detection efficiency is 99.99%, and those greater than this value are represented by ">99.99%".

[0048]

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PUM

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Abstract

The present invention discloses testing device which can accurately and conveniently measure the filtration efficiency of the bioaerosol of filtering material or insulation material and a method thereof. In the testing device of the invention, an air compressor and an aerosol mixing chamber are connected through an air inlet pipeline. The aerosol mixing chamber is connected with a movable part of a pneumatic fixture through pipeline. The fixed part of the pneumatic fixture is respectively connected with a downstream biological sampler, a downstream regulating pipeline and a shunting pipeline through the downstream pipeline. The aerosol mixing chamber is respectively connected with a sterilizing pipeline, a sampling pipeline and a regulating pipeline. The testing method according to the invention comprises the steps of preparing a bacterium suspension liquid, retaining the sample to be tested on the pneumatic fixture, decanting the bacterium suspension liquid into a bioaerosol generator, regulating the device and closing all valves, and counting when the culture is taken off and is executed with conditional cultivation. The present invention provides a cabinet type bioaerosol filtration efficiency testing platform which has the advantages of compact structure, movability and transferability.

Description

technical field [0001] The invention relates to the fields of air purification and biological cleaning technology, more specifically, a bioaerosol filtration efficiency testing device and method related to filtering or insulating materials such as medical masks and air filtering materials. Background technique [0002] Bio-cleaning technology is a key technology in the field of biological protection. With the increasing popularization and development of this technology, the testing method of bacterial filtration efficiency of medical masks and air filter materials has attracted more and more attention from the biomedical circles at home and abroad. Medical workers, especially those professional medical workers engaged in the treatment and care of the wounded and sick, are often exposed to infectious pathogenic microorganism aerosols due to their work. This working environment poses a serious threat to life and health . And because engineering control cannot completely elimi...

Claims

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Application Information

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IPC IPC(8): G01N33/00
Inventor 祁建城吴金辉郝丽梅张金明
Owner SANITARY EQUIP INST ACAD OF MILITARY MEDICAL SCI PLA
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