Device and method for detecting heat conducting property of high bulky easily-deformable material

Abstract

The invention relates to a device and a method for detecting the heat conducting property of a high bulky easily-deformable material, the device comprises a lower heat plate, an upper heat plate and a temperature measurement setting box, and further comprises a sample peripheral heat-insulating device and a sample thickness active control device, wherein the sample peripheral heat-insulating device comprises a heat-insulating box which covers the upper heat plate, the lower heat plate and the samples therebetween, and a heat-insulating top cover which is arranged on the periphery of the upper heat plate; the sample thickness active control device comprises: a lifting rack, a lifting arm and a clamper, wherein the clamper clamps the upper heat plate from above and is fixed with the lifting arm, and sliding can be formed between the lifting arm and the lifting rack. By means of the additional arrangement of the insulation device on the periphery of the samples, convection and heat conduction exchange between the environment and the circumference of high bulky material with larger thickness can be obstructed, thus blocking off error sources. As the sample thickness active control device is adopted, the heat conducting property of the samples under different known thicknesses can be accurately measured and the amount of heat dissipation of the same sample under different stress states can be measured.

Description

technical field [0001] The invention relates to a detection device and a detection method for the thermal conductivity of high-fluffy and easily deformable materials, in particular to a detection device and a detection method for the thermal conductivity of warm-filling wadding materials made of textile fibers and down. Background technique [0002] The thermal insulation effect of textiles has always been the primary function. With the development of society, the space for human activities expands, and the natural environment or man-made climate conditions that may be encountered become more severe, so the requirements for the thermal comfort and thermal insulation function of textiles are increasing. In thermal textiles, high-lofty flocculent fiber aggregate material is an extremely important auxiliary material. Its thermal insulation effect is crucial, and it is widely used in textile products such as cold-proof clothing, bedding, and cushions. Generally speaking, the hi...

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Problems solved by technology

[0006] Second, the thickness of the sample cannot be actively controlled for measurement, so it is impossible to examine possible changes in thermal conductivity due to changes in the thickness of the sample during use

[0007] Third, the calculation error of thermal conductivity

However, our research found that when using the existing test system to test the high-loft floc fiber aggregate material, the heat transfer direction through the high-loft floc fiber aggregate material is not one-dimensional, and it is difficult to form a vertically distributed temperature field. In some cases, the change of the temperature field is not linear, and the decrease of the temperature field is more than 50% when it is less than half of its thickness. The method of thermal conductivity can no longer be adapted, and it may be necessary to change from an arithmetic formula to a calculus formula

[0008] Fourth, the convective heat dissipation between the upper and lower hot plates and the surrounding environment cannot be ignored, causing obvious measurement errors

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