Abstract: In order to improve thermal insulation performance of heat-protective layers of fire rescue capsule structure, a high temperature test platform for insulation performance was built based on multi-layer gas insulated construction with multi-layer serpentine pipelines and aluminum silicate fiberboards to test thermal insulation effect of each layer before and after adding aluminum foil in high temperature environment. Then, low temperature carbon dioxide gas and normal temperature air were injected into thermal insulation pipelines at different inner temperature. At last, influences of the two gases on cooling effects of each layer were explored. The results show that adding aluminum foil in insulation structure can improve thermal insulation efficiency, and it will be most effective when heating temperature reaches 600 ℃ with an increase of 39.3% for insulation efficiency which will gradually decrease as temperature continues to rise. Cooling effects of gases depend on temperature difference between the gas and insulation layers, the greater temperature difference is, the more obvious cooling effects are, and low temperature gas works better than normal temperature gas.

Key words: fire rescue capsule, insulation performance, high temperature test, gas cooling, aluminum silicate fibers