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Efficient heat exchangers for cryogen-free mri magnets

A technology for heat exchangers and refrigerants, used in magnetic objects, household refrigeration devices, superconducting magnets/coils, etc., can solve problems such as coolant loss, and achieve the effects of low flow friction loss and large heat transfer area

Active Publication Date: 2016-02-17
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During a quench or other process that causes a temperature increase, expensive coolant is lost as it expands due to the increase in temperature before the system can be recooled
Escaping helium can displace oxygen in the magnet chamber, posing a potential health risk to persons in close proximity to the magnet

Method used

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  • Efficient heat exchangers for cryogen-free mri magnets
  • Efficient heat exchangers for cryogen-free mri magnets
  • Efficient heat exchangers for cryogen-free mri magnets

Examples

Experimental program
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Embodiment Construction

[0023] refer to figure 1 , an embodiment of the heat exchanger 5 in the system is shown. The magnet winding 10 generates heat during operation. The heat is effectively transferred away from the magnet windings 10 to the circulating helium vapor by a high efficiency winding heat exchanger 20 in a thermosiphon circuit. The helium vapor circulates between the winding heat exchanger 20 and the system heat exchanger 5 in a pipe 30 . Conduit 30 is a hermetically sealed closed loop system. At one end, advantageously the lower end, of the loop, the pipe and the gaseous helium absorb heat from the magnet 10 via a wound heat exchanger 20 . At the other end of the loop, advantageously the upper end, the gaseous helium loses heat through the system heat exchanger 5 to the liquid helium contained therein. The tubing 30 is coiled around a heat transfer sleeve or vessel 40 of the heat exchanger 5 . In the illustrated embodiment, dense cold helium gas flows by gravity from the system hea...

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PUM

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Abstract

A heat exchanger (5), comprising a heat-conducting cylindrical container (40), at least one heat-conducting pipe (30), a cooling column (90), and a refrigerant cold head (100). The cooling column and cold head condense gaseous helium to liquid helium to maintain liquid helium stored in the thermally conductive cylindrical vessel (40). The at least one heat conducting pipe (30) wraps circumferentially around the vessel (40) and extends to at least one superconducting magnet winding heat exchanger (20) and back. The tubing forms a selected loop that holds gaseous helium at pressures above about 104 bar (1500 PSI) at room temperature to about 0.75 bar at cryogenic temperatures.

Description

technical field [0001] The present invention relates to cooling of superconducting magnets, and in particular to heat exchangers and the like. Background technique [0002] Magnetic resonance (MR) scanners use superconducting magnets that are cooled to superconducting temperatures, for example below 5.2 Kelvin. Traditionally, liquid helium has been used to cool superconducting magnets because of its thermal properties. However, liquid helium is expensive. Many parts of the world do not have a steady supply of liquid helium or liquid helium substitutes. [0003] Typically superconducting magnets are immersed in liquid helium which changes from liquid to gas as it cools the magnet. The gas is then recondensed and / or cooled to a liquid state using a refrigerator or heat exchanger before being recycled back to the magnet. Alternatives to using liquid helium require efficient heat exchange methods to maintain the coolant and in turn maintain the magnet below critical temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B25/00F25D19/00F25B9/10
CPCF25B9/10F25B25/005F25D19/00G01R33/3804G01R33/3815H01F6/04F25B9/002G01R33/035
Inventor R·A·阿克曼P·门特乌尔M·达尔
Owner KONINKLJIJKE PHILIPS NV