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Pulse tube refrigerator

一种脉冲管制冷、脉冲管的技术，应用在制冷机、制冷组件、制冷和液化等方向，能够解决超导线圈电流承载能力下降等问题

Inactive Publication Date: 2008-11-05
OXFORD MAGNET TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the cryocooler can absorb 1W at 4.2K (such as the model RDK408 supplied by SumitomoHeavy Industries), then the temperature of the recondenser will increase to 4.7K, which causes a drastic drop in the current carrying capacity of the superconducting coil

Method used

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Examples

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Embodiment Construction

[0023] The best form for implementing the present invention conceived by the present inventor is described with examples. In the following description, a lot of detailed descriptions are made in order to fully understand the present invention. However, it is obvious to a person of ordinary skill in the art that the present invention can be implemented by various modifications described in the specific embodiment.

[0024]Referring to FIG. 6, which shows a first embodiment of the present invention, a two-stage pulse tube refrigerator device is shown. The regenerator tubes 92, 94 and the pulse tubes 96, 98 are shown in the figure, wherein the regenerator tube 94 is finned.

[0025] FIG. 6A shows a cross-sectional view through the regenerator tube 94 showing the annular fin 104 in the form of an annular disk surrounding the tube 94. The wall of the regenerator tube and the fin are made at the same time in a suitable manner, preferably made of the same material with moderate thermal c...

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PUM

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Abstract

The present invention relates to pulse tube refrigerators for recondensing cryogenic liquids. In particular, the present invention relates to the same for magnetic resonance imaging systems. In many cryogenic applications components, e.g. superconducting coils for magnetic resonance imaging (mri), superconducting transformers, generators, electronics, are cooled by keeping them in contact with a volume of liquified gases (e.g. helium, neon, nitrogen, argon, methane). In a first aspect, the present invention provides pulse tube refrigerator (PTR) arrangement within a cryogenic apparatus, wherein a regenerator tube of the PTR is finned. In this configuration the fins or baffles, are believed to increase the surface area available for distributed heat transfer from the helium atmosphere to the regenerator.

Description

Technical field [0001] The invention relates to a pulse tube refrigerator for recondensing cryogenic liquid. The present invention particularly relates to a pulse tube refrigerator used in a nuclear magnetic resonance imaging system. Background technique [0002] In many low-temperature applications, by maintaining components such as superconducting coils, superconducting transformers, electronic devices and a large amount of liquefied gas (such as helium, neon, nitrogen, argon, methane) for nuclear magnetic resonance imaging (MRI) Contact to cool these parts. Any heat dissipation in these components or heat entering the system will cause a portion to vaporize. In order to make up for the loss, it needs to be refilled. This work operation is considered problematic by users, and many efforts have been made over the years to introduce a refrigerator that recondenses any lost liquid to return to the bath. [0003] A two-stage Gifford McMahon (GM) cold head recondenser of an MRI (mag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B9/00F28F1/16F25B9/14F28F1/12F28F1/24F28F1/26F28F1/32F28F1/36
CPCF25B2400/17F25B2309/1412F25B9/145F28F1/24F25B2309/1408F28F1/124F25B2309/1414F25B2309/1415F25B9/10
Inventor H·潘T·休斯K·怀特
Owner OXFORD MAGNET TECH LTD
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