Enclosed refrigerant cooling system and method for cooling a superconducting magnet
A cooling system, superconducting magnet technology, applied in the direction of machines using refrigerant evaporation, refrigeration and liquefaction, household refrigeration equipment, etc., can solve the problems of refrigerant loss, imperfect connection, cooling power loss, etc.
Inactive Publication Date: 2017-03-08
SIEMENS HEALTHCARE LTD
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Problems solved by technology
Imperfect connections lead to loss of cooling power and can lead to loss of refrigerant
Method used
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[0011] The present invention provides a refrigerant cooling system comprising two hydraulically connected storage tanks. The system operates on a closed refrigerant cycle including liquefaction and evaporation.
[0012] exist figure 1 , a superconducting magnet 10 is housed in an evacuated cryostat 12 and is provided with a cooling circuit structure 13 which is supplied with liquid cryogen 14 from a cryogen container 15 positioned above the magnet 10 near the top of the . The refrigerant may be helium, but other suitable refrigerants are known to those skilled in the art. Liquid refrigerant 22 is supplied from the recondensing chamber 16 through a refrigerant supply pipe 18 connected at one end near the lower end of the recondensing chamber 16 and at the other end near the upper end of the refrigerant container 15 . In the case of helium, the recondensing refrigeration device 20 is arranged to recondense the refrigerant vapor within the recondensing chamber 16 into liquid...
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The invention discloses a refrigerant cooling system for cooling a superconducting magnet, comprising: a refrigerant container (15), which is connected to a cooling circuit structure (13) in thermal contact with the superconducting magnet; a condensation chamber (16), the recondensation chamber being arranged such that the lower end of the refrigerant container is above the lower end of the recondensation chamber (16); a recondensation refrigeration device (20), the recondensation refrigeration Apparatus arranged to recondense refrigerant gas within said recondensation chamber (16); and a heater (24) positioned to heat gaseous refrigerant within said recondensation chamber (16). The recondensing chamber (16) is hydraulically connected to said refrigerant container (15) through a refrigerant supply pipe (18). The upper end of the refrigerant supply pipe (18) is exposed to the refrigerant gas in the refrigerant container (15), while the lower end of the pipe (18) is exposed to the inside of the recondensing chamber (16), towards its lower part end or at its lower end.
Description
Background technique [0001] Early superconducting magnets used in MRI systems were cooled by partial immersion in a liquid cryogen. However, more recent designs have reduced the amount of liquid refrigerant required, typically through the use of cooling loop configurations. Such systems typically have a relatively small refrigerant vessel positioned at the top of the cooling circuit below a recondensing refrigerator to provide liquid refrigerant that is gravity-fed supplied in thermal contact with the magnet. The hot or boiling refrigerant is returned through the cooling circuit to the refrigerant container for recooling. However, such structures tend to have a greater height than is available in a typical installation room. The positioning of the recondensing refrigerator on top of the magnet is inconvenient for maintenance and replacement of the recondensing refrigerator. [0002] Some conventional configurations provide a reduced height recondensing refrigeration unit t...
Claims
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IPC IPC(8): F25D19/00
CPCF25D19/00F25B2400/17F25B41/40F25B19/00F25B49/00F25B2700/04F17C5/00F17C13/021G01R33/3804
Inventor V.米克希夫
Owner SIEMENS HEALTHCARE LTD