Wide temperature zone temperature control and constant temperature device for thermophysical property measurement
A technology of constant temperature device and wide temperature area, which is applied in measurement devices, household refrigeration devices, applications, etc., can solve the problems of limited liquid nitrogen volume, complex overall structure, poor experimental continuity, etc., and achieve the effect of simple structure
Active Publication Date: 2016-09-07
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
However, this thermostat also has a cold source built into the vacuum chamber, and the volume of liquid nitrogen it can hold is limited, so liquid nitrogen needs to be continuously replenished, and the continuity of the experiment is not good.
The invention patent with the notification number CN 101718725A discloses a device for measuring thermal properties of samples. The device has rich functions and can realize rapid testing. Its temperature control range is between -70 and +180°C, and the constant temperature environment is provided by a constant temperature air bath. , the constant temperature air bath is realized by the imported Challenge 250 test chamber; coupled with the built-in reaction kettle, etc., the overall structure is complicated and the preparation cost is high
In addition, it cannot achieve temperature control in temperature zones below -70°C
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[0020] The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose and characteristics of the present invention.
[0021] figure 1 It is a structural schematic diagram of a wide temperature zone temperature control and constant temperature device for thermophysical property measurement of the present invention, figure 2 It is a schematic diagram of the three-dimensional structure of the wide temperature zone temperature control and constant temperature device for thermophysical property measurement of the present invention. It can be seen from the figure that the device of the present invention is composed of a sample bottle 12, a blind flange cover 9, a sample holder, a wide-mouth Dewar bottle 18, a gas connection pipeline, a temperature measurement and control unit, and an air pressure measurement system.
[0022] The sample bottle is a stain...
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A wide-temperature-range control thermostat for thermophysical property comprises a sample bottle, a blind flange cover, a sample base, a liquid-nitrogen Duvel bottle, a gas connecting pipeline, a temperature measuring and control unit and a gas pressure measuring system. The sample bottle is a vacuum cavity and disposed in the wide-mouth Duvel bottle filled with liquid nitrogen. The sample base is disposed in the sample bottle and suspended on the blind flange cover via a hollow epoxy rod. The sample bottle is respectively connected with a vacuum pump and a gas source steel bottle through the gas connecting pipeline. The wide-temperature-range control thermostat is simple in structure, easy to process and realize, convenient to operate and capable of effectively measuring thermophysical property of materials within a temperature range of -190-+80 DEG C and providing the temperature control environment.
Description
technical field [0001] The invention relates to a technical means for realizing a thermal environment in a wide temperature range from low temperature to high temperature, in particular to a vacuum insulation protection type temperature control and constant temperature device for thermophysical property measurement, which uses liquid nitrogen as a cold source and electric heating as a heat source. Background technique [0002] A large number of thermophysical property measurements are required in scientific research and industrial processes. With the emergence of more and more materials such as polymer materials and nanomaterials, this demand is becoming stronger. And quite a few of them need to be carried out in the range of extremely low temperature to slightly higher than room temperature, and even need to be measured online in real time. The temperature range from liquid nitrogen temperature to 50 or 60 degrees higher than room temperature is the most concentrated temper...
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IPC IPC(8): F25D3/10G01N25/00
Inventor 黄永华汤剑宏林子洋罗伟莉李晓慈
Owner SHANGHAI JIAOTONG UNIV