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What are the methods of respiratory resistance detection?

2023-02-09 13:35

Respiratory resistance refers to the friction force generated by the airflow passing through the respiratory protective equipment during breathing, including inhalation resistance and exhalation resistance, and is one of the important indicators to measure the key performance of respiratory protective equipment. When the user wears respiratory protective equipment, the space between the inside of the mask and the tightly sealed part of the wearer's face forms a microenvironment with the human respiratory system, which affects the breathing activity of the wearer to a certain extent. When the user breathes, the airflow passes through all parts of the mask, the passage is long, the friction is large, and the resistance is also large. The breathing resistance of the mask is too large, and the impact on the human body is mainly manifested in respiratory muscle fatigue, increased heart burden and harmful space effects. It brings certain physiological and psychological loads to users, and when these loads exceed a certain limit, it will also have some adverse effects on the human body.

Breathing resistance detection method

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At present, the standards based on which international testing agencies test the respiratory resistance of respiratory protective equipment are JIS T8151-2005 (dust mask), BsEN 136-1998 (respiratory protective device. Full face mask. Requirements, tests, markings), GB 2626-2006 (Respiratory protective equipment, self-priming filter type anti-particulate respirator", GB 2890-2009 (Respiratory protection, self-priming filter type gas mask), etc., the detection principle of respiratory resistance in the above standards is basically the same, and the composition of the detection device system is basically the same and different It lies in the choice of test gas flow.

The respiratory resistance testing procedures required in the standard are basically the same. First, check the airtightness and working status of the testing device, adjust the ventilation volume to the standard requirements, and then wear the tested sample on the matching headform, and adjust the wearing position of the mask. And the tightness of the headband, ensure the tightness of the mask and the test headform, adjust the ventilation volume, test and record the inspiratory resistance/expiratory resistance.

Although the testing methods and procedures stipulated in the above standards are the same, there are still big differences in the testing methods used by different testing agencies when testing self-priming filter full-face masks.

Summary: What are the detection methods of breathing resistance, I will share here. After reading this article, you should have a basic understanding and understanding. I believe everyone understands it! In general, I hope it will be helpful to everyone.

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