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Zero backflow vent assembly for liquid helium cooled magnets

A technology of components and coolants, applied to parts of transformers/inductors, magnetic objects, electrical components, etc.

Inactive Publication Date: 2005-05-04
GE MEDICAL SYST GLOBAL TECH CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Once ruptured, the rupture disc must be replaced

Method used

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  • Zero backflow vent assembly for liquid helium cooled magnets
  • Zero backflow vent assembly for liquid helium cooled magnets
  • Zero backflow vent assembly for liquid helium cooled magnets

Examples

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Embodiment Construction

[0014] Referring now in detail to the drawings, in which like numerals correspond to like elements throughout, FIG. 1 shows a recondensing superconducting magnet system, generally indicated at 10 . The system 10 includes a cryogenic tank or helium pressure vessel 12 (when liquid helium is the coolant), wherein the vessel 12 is schematically shown in reduced size and encloses a plurality of electromagnetic coils 14 in liquid helium 18, 16. Helium pressure vessel 12 is enclosed within peripheral vacuum vessel 20 and intermediate elements such as thermal radiation shield 22 . Helium gas 21 is formed above the liquid helium 18 by boiling the liquid helium 18 to provide a cooling temperature to the superconducting magnet system 10 . In this way, the very low temperature keeps the current flowing through the solenoid coils 14, 16 after energization, to which the power source is initially connected and disconnected due to the absence of resistance of the cryogenic solenoid coils 14,...

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Abstract

The zero-backflow vent assembly ( 100 ) of the present invention prevents backflow into the magnet cryogen vessel ( 12 ) and therefore eliminates magnet icing. In general, the present invention employs a spring loaded valve in the magnet vent turret ( 38 ) to prevent the influx of air after a magnet quench event. The magnet vent turret ( 38 ) is the interface between the liquid helium vessel ( 12 ) in the magnet and the atmosphere ( 40 ). A vent stack is employed to channel any cryogenic exhaust gas out of the room, normally to the outside atmosphere ( 40 ).

Description

technical field [0001] The present invention relates generally to superconducting magnets, and more particularly to an assembly for preventing backflow of ambient air into a superconducting magnet following disconnection of the magnet or failure of a burst disk. Background technique [0002] It is well known that placing a magnet in a very cold environment, such as enclosing the magnet in a cryogenic chamber or in a pressure vessel with coolant, can cause it to appear superconducting. This very cold environment effectively reduces the resistance in the solenoid coil to negligible levels so that when power is initially connected to the coil to draw current through it, that current continues to flow even after the power is cut off The coil, thereby maintaining the magnetic field. Such magnetic fields are widely used in the field of magnetic resonance imaging (MRI). The coolant most commonly used in MRI superconducting magnets is helium, which exists as a liquid at about 4.2°...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/3815H01F6/00H01F27/14H01F27/40
CPCH01F6/00H01F27/14G01R33/3815H01F27/402
Inventor 罗伊·A·曼加诺凯瑟琳·W·麦吉尼斯张利民
Owner GE MEDICAL SYST GLOBAL TECH CO LLC