Full-automatic liquid nitrogen filling device and control method thereof

Abstract

The invention discloses a full-automatic liquid nitrogen filling device and a control method thereof. A temperature sensor (7) is arranged in a liquid nitrogen container (3) in a high temperature superconducting coil, and a liquid nitrogen delivery pipe (5) is arranged between a liquid nitrogen dewar (1) and the liquid nitrogen container (3) in the high temperature superconducting coil. When liquid nitrogen in the liquid nitrogen container (3) in the high temperature superconducting coil achieves the low position, a liquid adding controller (2) delivers liquid nitrogen low position temperature marginal value information according to the temperature sensor (7) to be instruments to start up a miniature pump (4) to open a switch, the miniature pump is opened, and air presses the liquid nitrogen in the liquid nitrogen dewar (1) into the liquid nitrogen container (3) in the high temperature superconducting coil. When liquid nitrogen in the liquid nitrogen container (3) in the high temperature superconducting coil achieves the high position, the liquid adding controller (2) delivers liquid nitrogen high position temperature marginal value information according to the temperature sensor (7) to be instruments to start up the miniature pump (4) to close a switch, and liquid nitrogen adding is stopped. The full-automatic liquid nitrogen filling device can automatically or manually add liquid, and is free of influences of magnetic resonance magnetic fields and electric fields.

Description

technical field [0001] The invention relates to a fully automatic liquid nitrogen filling device applied to magnetic resonance and a control method thereof. Background technique The early liquid nitrogen filling was in the form of a foot-operated self-boosting liquid nitrogen pump. This method of adding liquid nitrogen could not continue to work for a long time, and the equipment was heavy, and it was not compatible with magnetic resonance equipment. And another method that relies on the liquid level sensor to continuously add liquid nitrogen, although it can keep the liquid level constant, but because the liquid level material is a magnetic material, it cannot be compatible with magnetic resonance, and the commonly used semiconductor temperature sensor will easily will be damaged, crystal oscillator type temperature sensors will not work in magnetic fields. Contents of the invention The technical problem to be solved by the present invention is to provide a device and...

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Problems solved by technology

The early liquid nitrogen filling was in the form of a foot-operated self-boosting liquid nitrogen pump. This method of adding liquid nitrogen cannot continue to work for a long time, and the weight of the equipment is relatively large, and it is not compatible with magnetic resonance equipment.

And another method that relies on the liquid level sensor to continuously add liquid nitrogen, although it can keep the liquid level constant, but because the liquid level material is a magnetic material, it cannot be compatible with magnetic resonance, and the commonly used semiconductor temperature sensor will easily will be damaged, crystal oscillator type temperature sensors will not work in magnetic fields

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