Low-temperature container and pressure obtaining device for measuring liquid level of low-temperature container

Abstract

The invention provides a low-temperature container and a pressure obtaining device for measuring the liquid level of the low-temperature container. The low-temperature container comprises an inner container and a shell located outside the inner container; an interlayer is arranged between the inner container and the shell; the pressure obtaining device comprises a liquid-phase connector, liquid-phase pipelines and gas-phase pipelines; the liquid-phase pipelines include an internal liquid-phase pipeline and an external liquid-phase pipeline which are connected; the inner end of the internal liquid-phase pipeline is connected with a liquid-phase space of the inner container through the liquid-phase connector; the gas-phase pipelines includes an internal gas-phase pipeline and an external gas-phase pipeline which are connected; the internal gas-phase pipeline is connected with a gas-phase space of the inner container; the internal liquid-phase pipeline and the internal gas-phase pipelineare located in the interlayer; and the external liquid-phase pipeline and the external gas-phase pipeline are located outside the shell, and the external gas-phase pipeline and the external liquid-phase pipeline are filled with glass wool with the set lengths. According to the pressure obtaining device, the stability and accuracy of liquid level measurement can be improved.

Description

technical field [0001] The invention relates to the field of liquid level measurement of low-temperature containers, in particular to a pressure-taking device for liquid-level measurement of low-temperature containers and a low-temperature container with the pressure-taking device. Background technique [0002] The working principle of the differential pressure level gauge is to use the static pressure change caused by the liquid level difference to measure the liquid level. For a closed container, since the container itself has pressure, the static pressure is the static pressure of the liquid column plus the pressure of the gas phase space. To measure the actual liquid level, the pressure of the container itself must be subtracted, so the difference must be used. The positive pressure level gauge is connected to the bottom of the container, and the negative pressure is connected to the top of the container. The differential pressure obtained in this way is the static press...

AI Technical Summary

Problems solved by technology

Since the tank is filled with a cryogenic liquid at -196~-162°C, when the pressure is taken, the cryogenic liquid enters the gas and liquid phase pipelines and gasifies, and the gas has a certain pressure after gasification, forming an airflow impact , will cause the pressure difference between the upper and lower sides of the liquid level gauge to fluctuate sharply, which will cause the pointer of the liquid level gauge to shake, which will have a great impact on the observation of the liquid level in the tank

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