Lossless Dewar flask liquid helium filling process for helium liquefier

Abstract

The invention discloses a lossless Dewar flask liquid helium filling process for a helium liquefier. The lossless Dewar flask liquid helium filling process for the helium liquefier comprises the following steps of S1, assembling a liquid helium filling station, wherein the helium liquefier is assembled, a Dewar flask is prepared, and the helium liquefier is connected with the Dewar flask through a stainless steel vacuum hose; S2, preparing an automatic control system, wherein a pressure detection sensor is assembled in the Dewar flask, a pressure release valve is arranged on the Dewar flask, and the pressure detection sensor is externally connected with an alarm device and an emergency stop controller; S3, arranging a remote monitoring system, wherein a plurality of monitoring cameras are assembled, and an oxygen concentration alarm instrument and an acousto-optic alarm instrument are arranged in a filling workshop; S4, detecting connector gas tightness, wherein the connection gas tightness between the stainless steel vacuum hose and the Dewar flask is detected, meanwhile, the connection gas tightness between the stainless steel vacuum hose and the helium liquefier is detected, and metal wound gaskets and high-strength bolts are mounted in a combined manner at the connectors; and S5, detecting a pipe fitting system, wherein whether the Dewar flask is abnormal or not in the liquid helium filling process is detected through a temperature detector and a pressure gauge.

Description

technical field [0001] The invention relates to the technical field of liquid helium filling technology, in particular to a non-destructive Dewar tank liquid helium filling process for a helium liquefier. Background technique [0002] Industrial gases have inherent physical and chemical properties, so they play a pivotal role in the national economy. The speed of promotion and application is very fast, and it has penetrated into almost all walks of life. Helium has a wide range of applications. Helium can be used in optical fiber manufacturing, etc. Communication industry, welding, analytical industry for chromatography, deep-sea diving, semiconductor, liquid crystal manufacturing, etc. shielding gas, atomic furnace, etc., liquid helium can also be used in MRI, NMR, magnetic levitation, electromagnetic propulsion ship, superconducting power transmission, extremely low temperature Physics research, etc. As an excellent superconducting and cooling medium, ultra-high-purity liq...

AI Technical Summary

Problems solved by technology

[0002] Industrial gases have inherent physical and chemical properties, so they play a pivotal role in the national economy. The speed of promotion and application is very fast, and it has penetrated into almost all walks of life. Helium has a wide range of applications. Helium can be used in optical fiber manufacturing, etc. Communication industry, welding, analytical industry for chromatography, deep-sea diving, semiconductor, liquid crystal manufacturing, etc. shielding gas, atomic furnace, etc., liquid helium can also be used in MRI, NMR, magnetic levitation, electromagnetic propulsion ship, superconducting power transmission, extremely low temperature Physics research, etc. As an excellent superconducting and cooling medium, ultra-high-purity liquid helium is widely used in industry, aerospace and other fields. The main process of the liquid helium filling station is from liquid helium with a pressure below 10PSI The liquid phase of the tank is taken out, and it is filled into the Dewar bottle through a stainless steel vacuum hose. When the Dewar is filled, the vent valve is opened to recover the gaseous phase gas. Cause damage to the Dewar bottle, and the staff need to frequently replace or repair the Dewar bottle, thus affecting the work efficiency of liquid helium filling

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