Material low-temperature thermal expansion coefficient testing device using refrigerator as cold source

Abstract

The invention discloses a material low-temperature thermal expansion coefficient testing device using a refrigerator as a cold source. The device comprises a high-resolution linear variable differential transformer (LVDT) displacement sensor, a cylindrical quartz holder, an ejection rod, a vacuum heat insulation barrel, a test sample cavity, a thermal radiation-proof screen and an external gas storage bag, wherein the high-resolution LVDT displacement sensor is arranged on a horizontal supporting plate; one end of the cylindrical quartz holder is arranged on the lower end face of the displacement sensor, the cylindrical quartz holder is provided with a bottom plate, the lower side wall of the cylindrical quartz holder is provided with a side wall hole, and the ejection rod is positioned in the axial center of the quartz holder; the vacuum heat insulation barrel is arranged below the displacement sensor and the horizontal supporting plate; the lower middle part of the test sample cavity is arranged in the vacuum heat insulation barrel, and a temperature controller is arranged in the test sample cavity; the test sample cavity covers the quartz holder; the thermal radiation-proof screen is positioned in the vacuum heat insulation barrel; helium is filled in the external gas storage bag; the external gas storage bag is connected with the test sample cavity; and a cold head of the refrigerator is arranged in the vacuum heat insulation barrel and is in contact with the test sample cavity through soft connection. By adopting the testing device, liquid helium and liquid nitrogen are not required, and the thermal expansion coefficient of a material can be tested at any temperature of between 4.2K and 300K; and the device is accurate in temperature control, simple in structure, easy to operate and high in efficiency.

Description

technical field [0001] The invention relates to a material low-temperature thermal expansion coefficient testing device, in particular to a material low-temperature thermal expansion coefficient testing device suitable for a refrigerator in a low-temperature environment (4.2k-300K) as a cold source. Background technique [0002] With the development of my country's hydrogen energy, nuclear fusion energy, aerospace, applied superconductivity, gas industry, and some large scientific projects, there are more and more projects involving cryogenic engineering. In the field of industry and scientific research, the demand for low-temperature materials is increasing, and the performance data requirements for low-temperature materials are becoming more and more comprehensive. Materials work in a low temperature environment, and their low temperature physical properties are usually different from those at room temperature. Among them, the material thermal expansion coefficient is an ...

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Problems solved by technology

[0006] The object of the present invention is to provide a low-temperature thermal expansion coefficient testing device using a refrigerator as a cold source, so as to overcome the defects of existing low-temperature thermal expansion coefficient testing devices that rely heavily on liquid nitrogen or liquid helium resources, high cost, and complicated operation.

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