Vacuum low-temperature thermostat

Abstract

The invention provides a vacuum low-temperature thermostat, which comprises a vacuum chamber for maintaining a vacuum state, a first cavity (4) and a second cavity (5), wherein the first cavity (4) is suspended in the vacuum chamber, and is used for containing a first refrigerant; at least two first conduits (2) for introducing and / or discharging fluid are connected to the first cavity (4); a cooling area is below the first cavity (4); the second cavity (5) is suspended in a way of surrounding the first cavity (4) in the vacuum chamber, and is used for containing a second refrigerant; the boiling point of the second refrigerant under standard atmospheric pressure is higher than that of the first refrigerant; at least two second conduits (3) for introducing and / or discharging the fluid are connected to the second cavity (5); the second cavity (5) can be used for externally cooling the first cavity (4), and is spaced from the first cavity (4) through vacuum. The vacuum low-temperature thermostat has the characteristics of low consumption of refrigerants with low boiling points and slight vibration.

Description

technical field [0001] The invention relates to the field of cryogenic technology processing, in particular to a vacuum cryostat. Background technique [0002] In scientific research (such as surface physics, superconductivity physics) and medical examination (such as magnetic resonance imaging MRI), vacuum environment and low temperature environment are essential. Maintaining a low temperature environment requires the use of a cryostat. Cryostats usually use liquid nitrogen and / or liquid helium as the cooling medium, and there are two main modes of operation, namely continuous flow cryostats and Dewar cryostats. Dewar refers to a container with a vacuum interlayer in the container wall. Continuous flow cryostats generally achieve the effect of cooling by continuously flowing liquid helium through the components that need to be cooled. In this way, the part where the cooling medium is stored and the part that needs to be cooled can be separated, so that the part that need...

AI Technical Summary

Problems solved by technology

The disadvantage of this device is that the liquid helium storage chamber is tightly wrapped on the liquid nitrogen storage chamber, and there is only one layer of chamber wall between the two, that is, in this device, the outer wall of the liquid helium storage chamber is also the inner wall of the liquid nitrogen storage chamber

In this way, the heat conduction between the higher temperature liquid nitrogen (77K) and the lower temperature liquid helium (4.2K) will be very easy, thereby forming a large-scale heat exchange, thereby increasing the consumption of liquid helium, Not conducive to saving liquid helium resources

[0005] Also, liquid helium and liquid nitrogen boil as they cool, creating vibrations and possibly the system itself

These vibrations are not conducive to the development of the experiment, and may affect the accuracy of some experimental data, so people hope to minimize the vibration when the vacuum cryostat is working

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