A liquid nitrogen evaporator for X-ray single crystal diffractometer

Abstract

The invention relates to a liquid nitrogen evaporator used for an X-ray single-crystal diffractometer. The liquid nitrogen evaporator comprises a vaporizing chamber, a first gas path connector, a second gas path connector, a temperature control component and a heat exchanger, wherein the vaporizing chamber is of a tubular structure which is vertically placed; the temperature control component is mounted in the vaporizing chamber in a sealing way; the heat exchanger is spirally wound outside the tubular vaporizing chamber and is communicated with the vaporizing chamber by the first gas path connector; the structure of the heat exchanger is that two copper tubes with different specifications and different thicknesses are mutually nest and are spirally wound outside the vaporizing chamber. The liquid nitrogen evaporator is firstly applied to the X-ray single-crystal diffractometer, the radiation diffusion of X rays inside a crystal is obviously reduced by reducing the temperature, the damage to a crystal sample is effectively reduced, the heat exchange length is prolonged by adopting the spiral heat exchanger, cold and hot ends favorably and always keep respective temperature, and temperature control measures are not additionally adopted for maintaining the temperature.

Description

technical field [0001] The invention relates to a liquid nitrogen evaporator, in particular to a liquid nitrogen evaporator used for an X-ray single crystal diffractometer. Background technique [0002] X-ray single crystal diffractometer can analyze the structure and composition of substances, and can accurately determine the single crystal structure of molecules without destroying the sample. Single crystal diffraction technology can determine the spatial arrangement and structural symmetry of atoms (molecules, ions) inside the crystal, measure the bond length, bond angle, and charge distribution between atoms, and explore the relationship between the microstructure and macroscopic properties of substances. [0003] Complete image data for most single-crystal samples is collected with a single sample surrounded by a flow of cryogenic gas. Usually the temperature when collecting image data is done in the range of 100K-200K. For biological macromolecules, the radiation dif...

AI Technical Summary

Problems solved by technology

Liquid nitrogen is widely used in industrial production. When using liquid nitrogen, because it is in liquid, it cannot be used directly. It can only be vaporized to form nitrogen for reuse. However, due to the extremely low temperature of liquid nitrogen, when gasified A mixture of ice and liquid is formed, which is not conducive to output use

At the same time, the liquid nitrogen cryogenic device used in industry has a large volume and produces a large amount of nitrogen gas, so it cannot be directly applied to the X-ray single crystal diffractometer with low demand for low temperature nitrogen gas.

[0005] At present, the application of liquid nitrogen evaporators in X-ray single crystal diffractometers that can reduce the damage to crystal samples by lowering the temperature has not been reported yet.

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