Dynamic thermal protection performance testing and evaluating device

Abstract

The invention relates to a dynamic thermal protection performance testing and evaluating device, and belongs to the technical field of occupational safety and health. The dynamic thermal protection performance testing and evaluating device is used for fixing fabric to be tested so as to test the fabric to be tested, and comprises a support, a dynamic human body simulating device arranged on the support and used for fixing the fabric to be tested and promoting the fabric to be tested to deform, and a disaster source and a heat flux sensor which are oppositely arranged on the two sides of the dynamic human body simulating device, and a data acquisition and program control system in signal connection with the heat flux sensor, wherein the dynamic human body simulating device comprises a human body simulator propped against the fabric to be tested and a stretching device at least clamped at one end of the fabric to be tested; the human body simulator comprises a propping wall propped against the fabric to be tested; the propping wall and the disaster source are oppositely arranged on the two sides of the fabric to be tested; the fabric to be tested and the heat flux sensor are oppositely arranged on the two sides of the propping wall; the dynamic thermal protection performance testing and evaluating device further comprises a dynamic air layer changing device for driving the heat flux sensor to move relative to the propping wall.

Description

technical field [0001] The invention relates to a fabric protection performance evaluation device, in particular to a dynamic thermal protection performance evaluation device, which belongs to the technical field of occupational safety and health. Background technique [0002] Workers in the navy, firefighting, petrochemical, energy industry, food processing and other industries may be exposed to various thermal hazard environments (including flames, radiant heat, high-temperature liquids or high-pressure steam, etc.), which pose potential threats to their health. Objectively and accurately evaluating the protective performance of protective fabrics can provide an important scientific basis for the development and selection of protective materials and equipment. At present, TPP tester, RPP tester, cone calorimeter, etc. are mainly used for the evaluation of flame and radiation heat disaster protection performance; the high temperature liquid protection performance tester spe...

AI Technical Summary

Problems solved by technology

Secondly, the gap between the clothing and the human body also increases or decreases regularly with the movement of the human body, which affects the protective performance of the clothing.

Finally, due to human body movement, clothing fabrics come into contact with human skin, and the energy stored in clothing is released rapidly, which may cause skin burns

[0004] In fact, due to changes in the posture of the human body, protective clothing will deform to varying degrees. On the one hand, the stretched and deformed parts of the fabric will be directly close to or press the skin, and the thickness of the air layer under the clothing will decrease, which will greatly accelerate the heat transfer rate. When the heat stored in the fabric is released, it is more likely to cause burns to the human body; on the other hand, the tensile deformation of the fabric will change its initial physical characteristics, resulting in changes in the properties of the fabric such as density, air permeability, thickness, thermal conductivity, and specific heat capacity. Affects thermal protection performance of clothing systems

In addition, under the dynamic conditions of the human body, the air layer between the clothing and the human body increases or decreases regularly, which will inevitably affect its protective performance.

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