Heat conductivity coefficient measurer of double-test-piece guarded hot plate for liquid nitrogen temperature area

Abstract

The invention relates to a heat conductivity coefficient measurer of a double-test-piece guarded hot plate for a liquid nitrogen temperature area, comprising a vacuum cover, a guarded hot plate, two liquid nitrogen containers, three temperature sensors, a supporting plate, a sliding structure, a clamping structure and a hanging structure, wherein the guarded hot plate is arranged between the two liquid nitrogen containers; the clamping structure is arranged on the liquid nitrogen containers; the liquid nitrogen containers and the guarded hot plate are fixed on the sliding structure; the sliding structure is connected with the hanging structure; the hanging structure is fixed at the upper end in the vacuum cover; the guarded hot plate and the liquid nitrogen containers are fixed on the hanging structure; and the vacuum cover is welded on the supporting plate. The invention is used for measuring the heat conductivity coefficient of a heat insulating material of the liquid nitrogen temperature area, wherein a testing part is hung on the vacuum cover, and glass fiber reinforced plastics are used as the heat insulating material, thereby liquid nitrogen evaporation is reduced; and a vacuum pumping processing mode is adopted, thus the measurement errors brought by heat conduction and convective heat exchange of air are effectively reduced.

Description

technical field [0001] The invention relates to a device in the technical field of instrument testing, in particular to a thermal conductivity tester for a double-specimen protective hot plate used in a liquid nitrogen temperature zone. Background technique [0002] At present, in the research, development, production and application of some thermal insulation materials, it is necessary to accurately measure the thermal conductivity of the material. Especially in the liquid nitrogen temperature zone (-196°C), the storage and transportation of cryogenic liquids have become particularly critical. The use of thermal insulation materials with low thermal conductivity is one of the key factors to reduce the evaporation rate of cryogenic liquids during storage and transportation, and also directly It is related to the ability and economy of long-distance transportation of cryogenic liquids. However, at present, there is no standardization of the thermal conductivity test platform...

AI Technical Summary

Problems solved by technology

However, its structure and characteristics are also not suitable for the determination of thermal conductivity of thermal insulation materials under the condition of liquid nitrogen temperature zone.

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