Nonmetal magnetism-free liquid nitrogen dewar

Abstract

The invention discloses a nonmetal magnetism-free liquid nitrogen dewar which is composed of a vacuum cover and a dewar liner (1). The vacuum cover comprises an outer casing (2) and a cover plate (3), the dewar liner (1) is arranged inside the outer casing (2), at least one liquid inlet tube (4) or liquid outlet tube (5) is arranged on the dewar liner (1), at least one circular hole (6) is arranged on the cover plate (3), the circular hole (6) is matched with the liquid inlet tube (4) or the liquid outlet tube (5), a heat insulation layer (7) is arranged at the periphery of the dewar liner (1), a through hole (8) is arranged in the middle of the cover plate (3), the diameter of the through hole (8) is matched with the inner diameter of the dewar liner (1), and a vacuum pumping port (9) is further arranged on the cover plate (3). By means of the structure, the nonmetal magnetism-free liquid nitrogen dewar can be used for installing a high temperature superconducting radio frequency coil, simultaneously has the effects of containing liquid nitrogen and cooling the high temperature superconducting radio frequency coil.

Description

technical field [0001] The invention relates to a liquid nitrogen Dewar, in particular to a non-metallic liquid nitrogen Dewar device for containing liquid nitrogen and installing and cooling a high-temperature superconducting radio frequency coil. Background technique [0002] At present, the interior of the existing Dewar is mostly made of metal materials, such as stainless steel. Because the outer shell is made of metal material, the outer shell will shield the magnetic resonance imaging signal. In addition, the metal material of the Dewar is magnetic, which will affect the magnetic resonance imaging signal. , there are also non-metallic non-magnetic Dewars on the market. The existing non-metallic Dewars are mainly used to contain low-temperature liquids, and high-temperature superconducting radio frequency coils cannot be placed, and some structures in the Dewar are still using metal materials, such as: stainless steel , aluminum foil, etc., although the amount used is s...

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Problems solved by technology

[0002] At present, the interior of the existing Dewar is mostly made of metal materials, such as stainless steel. Because the outer shell is made of metal material, the outer shell will shield the magnetic resonance imaging signal. In addition, the metal material of the Dewar is magnetic, which will affect the magnetic resonance imaging signal. , there are also non-metallic non-magnetic Dewars on the market. The existing non-metallic Dewars are mainly used to contain low-temperature liquids, and high-temperature superconducting radio frequency coils cannot be placed, and some structures in the Dewar are still using metal materials, such as: stainless steel , aluminum foil, etc., although the amount used is small, it will still shield the MRI signal and affect the imaging effect

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