Temperature-and-pressure-adjustable testing apparatus for heat conductivity coefficient of cloth
A technology of thermal conductivity and testing equipment, which is applied in the field of equipment for testing the thermal conductivity of fabrics, and can solve problems such as the inability to provide low temperature and vacuum testing environments
Inactive Publication Date: 2016-07-27
BEIHANG UNIV
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Problems solved by technology
However, the current fabric thermal conductivity testing devices at home and abroad cannot provide a low-temperature, vacuum testing environment.
Method used
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[0026] The invention is a cloth thermal conductivity testing device with adjustable temperature and pressure, such as figure 1 As shown, the device is mainly divided into 5 parts: vacuum system A, refrigeration system B, temperature measurement system C, heating system D and cloth clamping device E. The vacuum system A is composed of a vacuum chamber 1, a vacuum pump 7 and a piezoresistive vacuum gauge 9, and its main function is to adjust the pressure in the chamber by pumping the air in the vacuum chamber 1 through the vacuum pump 7. The vacuum chamber 1 is a cylindrical container with a diameter of Φ550mm and a depth of 550mm, stainless steel argon arc welding, the strength design can withstand static pressure above one atmosphere, the door is sealed with a rubber ring, and the vacuum pump 7 can be used to pump down to an absolute pressure of 0.1Pa the following. Open the vacuum pump 7 and the vacuum pump valve 8 to pump the vacuum chamber 1, observe the pressure value dis...
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The invention provides a temperature-and-pressure-adjustable testing apparatus for heat conductivity coefficient of cloth. The testing apparatus comprises a vacuum system, a refrigeration system, a temperature measurement system, a heating system and a cloth clamping device. The testing apparatus is characterized in that the vacuum system is composed of a vacuum cabin, a vacuum pump and a piezoresistive vacuum gauge; the refrigeration system is composed of a pressured Dewar flask and a vacuum cabin; the temperature measurement system is composed of a temperature sensor, an itinerant detector and a computer; the heating system is composed of an electric heating piece, a transformer and a power meter; the cloth clamping device is composed of clamping plates and a bracing frame; the vacuum pump adjusts pressure in the vacuum cabin; temperature in the vacuum cabin is adjusted through cooling of liquid nitrogen; the temperature measurement system is used for acquisition, real-time monitoring and recording of temperature values of each temperature measurement point; the heating system is used for heating cloth; and the cloth clamping device is used for clamping and fixing experimental cloth. A testing environment with a temperature of normal temperature to -150 DEG C and a pressure of 1 atm to 0.1 Pa can be realized in the vacuum cabin, so testing of the heat conductivity coefficient of cloth in environments with different temperatures and pressures can be realized.
Description
Technical field: [0001] The invention relates to a device capable of testing the thermal conductivity of cloth under different temperature and pressure environments. technical background: [0002] When working in a high-altitude environment (low temperature / low pressure), the thermal insulation performance of protective clothing is particularly important, and the thermal conductivity of the fabric is an important parameter to measure the thermal insulation performance of the fabric. Since there is no convective heat transfer of air in the heat transfer mode of the fabric under vacuum, the thermal conductivity of the thermal insulation fabric will be improved to varying degrees relative to the ground. The accurate test of thermal conductivity is of great significance to the calculation of clothing thermal model, the systematic planning of clothing fabrics, and the reduction of clothing weight. However, the current cloth thermal conductivity testing devices at home and abroad...
Claims
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IPC IPC(8): G01N25/20
Inventor 丁立孙志彬裴葆青樊瑜波
Owner BEIHANG UNIV