Automatic testing device for dynamic respiration resistance of mask

Abstract

The invention discloses an automatic testing device for dynamic respiration resistance of a mask. The testing device comprises a head mold, a respiration simulator connected with the head mold through a pipeline, a pressure sensor, a lower computer and an upper computer, wherein the respiration simulator comprises an inspiration air source vacuum pump, an expiration air source compression pump, a reversing device solenoid valve and a mass-flow controller; the lower computer is connected with the solenoid valve, the pressure sensor and the upper computer, and a direction, a flow speed and airflow quantity of the respiration simulator can be controlled through receiving a signal of the upper computer, so that simulated respiratory frequency and tidal volume are adjusted; meanwhile, a voltage signal of the pressure sensor is received and is transmitted to the upper computer. The automatic testing device for the dynamic respiration resistance of the mask, disclosed by the invention, can be used for finishing a test on the dynamic respiration resistance of the mask; a correlation curve between dynamic respiration airflow and respiration resistance, and two respiration resistance property indexes including maximum expiration resistance and maximum inspiration resistance can be measured, so that the automatic testing device can be applied to a mask detection industry, and rapid measurement of the dynamic respiration resistance of the mask is realized.

Description

technical field [0001] The invention relates to a test device, in particular to an automatic test device for dynamic breathing resistance of masks. Background technique [0002] On August 18, 2016, Tsinghua University and the Institute for Health Effects of the United States jointly released the report "The Burden of Disease in China Caused by Coal Burning and Other Major Air Pollution Sources". die. In order to prevent PM2.5 particulate pollutants, masks have become a necessity for ordinary people to travel in polluted weather. The mask mainly uses polypropylene electret melt-blown non-woven fabric as the filter layer to intercept particulate matter, but the filter material will also generate greater resistance to air flow, and high filtration efficiency often means high breathing resistance. Respiratory resistance is the main indicator for evaluating the comfort of consumers when wearing masks. On the premise of ensuring that the filtration efficiency meets the requireme...

AI Technical Summary

Problems solved by technology

In addition, in order to improve wearing comfort, the mask is often equipped with an exhalation valve, which contains an exhalation valve silicone gasket, which is closed when inhaling and opened when exhaling. During the static test, the exhalation valve gasket is normally open / Normally closed state, rather than the alternate open / closed state when actually worn, so it is impossible to judge the performance of the exhalation valve gasket during use

[0004] At present, my country's mask standards have not introduced dynamic breathing resistance test method terms according to ISO standards, and there is no corresponding dynamic breathing resistance test device for masks in China.

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