Multi-layer low-temperature heat insulation structure arranged in density-variable mode

Abstract

The invention discloses a multi-layer low-temperature heat insulation structure arranged in a density-variable mode. The multi-layer low-temperature heat insulation structure arranged in the density-variable mode comprises multiple reflecting layers which are evenly separated into three parts in the thickness directions of the reflecting layers. Different layers of isolating materials are filled among adjacent reflecting layers of each part, wherein the layer density of the multi-layer low-temperature heat insulation structure close to a cold-boundary part is 7.5 layers per centimeter, the layer density of the middle part of the multi-layer low-temperature heat insulation structure is 15 layers per centimeter, the layer density of the multi-layer low-temperature heat insulation structure close to a hot-boundary part is 22.5 layers per centimeter. Compared with the traditional multi-layer heat insulation arrangement mode that the density of the whole structure is 15 layers per centimeter, the arrangement mode of the multi-layer low-temperature heat insulation structure arranged in the density-variable mode ensures that heat insulation performance is improved by 14.3% when being applied to a liquid nitrogen container with the hot-boundary temperature of 353K and the cold-boundary temperature of 77K for heat preservation.

Description

technical field [0001] The invention relates to a high-efficiency heat insulation technology for a cryogenic system, in particular to a multi-layer low-temperature heat insulation structure with variable density configuration. Background technique [0002] The creation and maintenance of a cryogenic environment is inseparable from effective thermal insulation technology. In view of the characteristics of cryogenic applications where there is a large temperature difference from the ambient temperature, heat insulation is mainly achieved from three perspectives: preventing heat radiation, reducing heat conduction of solid insulation materials, and eliminating gas convective heat transfer. Vacuum multi-layer insulation is the best way of heat insulation technology at low temperature. It effectively eliminates the above three heat transfer methods at the same time, and also has the advantages of light weight and small footprint, so it is called "super heat insulation". . Vacuu...

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Problems solved by technology

These traditional multi-layer insulation technologies make the entire multi-layer material into a uniform stacking configuration along the thickness direction, without considering the optimal configuration of the internal reflective layer and spacer material in the thickness direction, so it cannot give full play to its maximum thermal insulation performance

There is no patent report on the multi-layer heat insulation that can realize this optimized configuration

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