Diamond pressure cavity device with liquid nitrogen cooling system

Abstract

The invention provides a diamond cavity pressing device with a liquid nitrogen cooling system. The liquid nitrogen pump sucks liquid nitrogen in a liquid nitrogen bottle into a liquid nitrogen coolinglantern ring through a liquid nitrogen inlet, the temperature and the cooling rate of a sample bin in the liquid nitrogen cooling lantern ring are controlled, the thermocouple detects the real temperature of the sample bin and feeds back the real temperature to an external computer, the external computer compares the difference value between the real temperature of the sample bin and the set temperature, the rotating speed of the liquid nitrogen pump and the power of the heating furnace are controlled, and a target temperature and a cooling rate and / or a heating rate of the target temperatureare obtained. The diamond cavity pressing device is advantaged in that the sample bin is close to the liquid nitrogen cooling lantern ring, the liquid nitrogen pump cools a sample through liquid nitrogen, the temperature can be reduced to-190 DEG C or below at least, and the circulation rate of the liquid nitrogen is adjusted through the rotating speed of the liquid nitrogen pump, so the temperature and the cooling rate of the sample bin are controlled.

Description

technical field [0001] The invention relates to the technical field of diamond pressure chambers, in particular to a diamond pressure chamber device with a liquid nitrogen cooling system. Background technique [0002] Diamond cavity high temperature and high pressure technology has been widely used in various fields such as earth science, solid physics, material science, planetary science and so on, and has achieved great success. However, there are still some limitations in the application of diamond pressure chambers in the low temperature field. First of all, the conventional diamond cooling device must be connected to a nitrogen cylinder, which is not easy to move, so that the experimental site lacks flexibility. Secondly, the cooling medium of conventional devices is not liquid nitrogen, but nitrogen gas is formed through the liquid nitrogen cooling chamber, so that the cooling temperature is not low enough, the lowest can only reach -170°C. Third, the cooling rate of...

AI Technical Summary

Problems solved by technology

However, there are still some limitations in the application of diamond pressure chambers in the field of low temperature

First of all, conventional diamond cooling devices must be connected to nitrogen cylinders, which are not easy to move, so that the experimental site lacks flexibility

Secondly, the cooling medium of conventional devices is not liquid nitrogen, but nitrogen is formed through the liquid nitrogen cooling chamber, so that the cooling temperature is not low enough, the lowest can only reach -170°C

Third, the cooling rate of conventional devices is controlled by manually adjusting the valve and changing the nitrogen intake rate, so that the cooling rate is not easy to control

Finally, the nitrogen used for cooling is vented directly without recycling

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