A self-pressurization device and pressurization method for liquid helium Dewar

Abstract

A self-pressurizing device and a pressurizing method for a liquid helium dewar, aiming at solving the technical problems in the prior art that the liquid helium dewar pressurization method easily causes waste of helium and the cost of the pressurization operation is high. The invention includes a Dewar for storing low-temperature liquefied gas. The Dewar communicates with an external heat exchange piston through a first pipeline. The first pipeline is provided with a booster valve. The heat exchange piston includes a heat exchange chamber and can The reciprocating sliding piston rod in the heat chamber, the first pipe includes an outer pipe and an inner pipe, the gas flows in the outer pipe and the inner pipe are independent of each other, the heat exchange chamber includes a first side wall and a second side wall, the first side The inlet valve is arranged on the wall, and the exhaust valve is arranged on the second side wall. The inlet valve is connected with the end of the outer pipe away from Dewar through the second pipeline, and the exhaust valve is connected with the end of the inner pipe away from Dewar through the third pipe. The pipes are connected, and the other end of the inner pipe is connected with the heat exchange air bag inside the Dewar.

Description

technical field [0001] The invention relates to the technical field of liquid helium pressurization, in particular to a self-pressurization device and a pressurization method for a liquid helium Dewar. Background technique [0002] In the process of carrying out scientific research in the low temperature field, it is an indispensable link to transport liquid helium to experimental instruments. At present, the commonly used delivery method is to insert the infusion tube at room temperature (300K) into the Dewar (4.2K) , the liquid helium vaporizes when heated, the pressure in the Dewar bottle rises, and the liquid helium is squeezed out from the infusion tube, thereby completing the delivery of the liquid helium. The liquid level keeps dropping, the infusion tube and the liquid helium gradually reach thermal equilibrium, and the pressure in the Dewar drops accordingly. When the pressure in the Dewar drops to a certain threshold, the liquid helium in the Dewar cannot continue ...

AI Technical Summary

Problems solved by technology

[0009] The present invention provides a self-pressurizing device and a pressurizing method for liquid helium Dewar in order to overcome the technical problems that the liquid helium Dewar pressurization method easily causes helium waste and the cost of the pressurization operation is relatively high in the prior art , the device can realize the continuous pressurization of liquid helium dewar, and the pressurization operation is convenient and efficient

Images