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Ultra-low temp refrigerating device

An ultra-low temperature freezing and freezer technology, which is applied to household refrigeration devices, refrigerators, refrigeration components, etc., can solve the problems of reduced freezing capacity of shielded freezers, reduced freezing capacity of JT freezers, insufficient freezing capacity of shielded freezers, etc. The effect of suppressing the fluctuation of the capability and realizing the operation efficiency

Inactive Publication Date: 2003-12-03
CENTRAL JAPAN RAILWAY COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with such control, not only the freezing capacity of the JT freezer is reduced, but also that of the shielded freezer
However, the refrigerating load of the shield refrigerator is almost constant regardless of the operating state, so there is a risk that the refrigeration capacity of the shield refrigerator will be insufficient.

Method used

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Examples

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Embodiment 1

[0032] figure 1 The shown cryogenic refrigeration device 10 is a so-called vehicle-mounted refrigeration device mounted on a superconducting linear electric locomotive (not shown), and is a device for freezing the superconducting magnet 90 of the superconducting linear electric locomotive.

[0033] -Composition of ultra-low temperature freezer-

[0034] The cryogenic freezer 10 includes a helium refrigerator 20 for generating, cooling and holding liquid helium, and a nitrogen refrigerator 40 for cooling and holding liquid nitrogen. The helium refrigerator 20 has a precooling refrigerator 30 for precooling helium. These helium refrigerators 20 and nitrogen refrigerators 40 both use helium as a refrigerant.

[0035] The cryogenic refrigerator 10 is equipped with a helium refrigerator 20 having a first circuit 2A as a JT circuit and a precooling circuit 3A as a refrigeration circuit of a precooling refrigerator 30, and a second refrigerant circuit as a nitrogen refrigerator 40....

Embodiment 2

[0073] As shown in FIG. 4 , instead of the liquid level sensor 70 , a pressure sensor 71 for detecting the internal pressure of the buffer tank 12 may be provided as means for detecting the amount of liquid helium in the helium tank 11 .

[0074] As mentioned above, the buffer tank 12 for supplying and recovering helium gas is installed on the ultra-low temperature freezer 10, and the pressure of each circuit 2A, 3A, and 4A circulating helium is maintained at a predetermined pressure. A certain correlation was found between the amount of liquid helium in 11 and the internal pressure of the buffer tank 12. That is, when the evaporation amount of liquid helium in the helium tank 11 is large, the amount of liquid helium decreases and the internal pressure of the buffer tank 12 increases. Contrary to this, when the evaporated amount of liquid helium of the helium tank 11 decreases, the amount of liquid helium increases and the internal pressure of the buffer tank 12 decreases.

...

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Abstract

The cryogenic refrigeration system of the present invention includes: a shield plate for preventing a radiant heat from entering a superconducting magnet; a helium refrigerator for generating a liquid helium, the helium refrigerator including a pre-cooling refrigerator for pre-cooling a helium gas; and a nitrogen refrigerator for cooling nitrogen in a nitrogen tank; and a controller, whereby when a vehicle is running, a low pressure side compressor and a high pressure side compressor are operated, and the helium refrigerator and the nitrogen refrigerator are operated, whereas when the vehicle is not running, the operation of the pre-cooling refrigerator of the helium refrigerator is stopped while the operation of the nitrogen refrigerator is continued.

Description

【Technical field】 [0001] The invention relates to an ultra-low temperature freezer for cooling superconducting magnets. 【Background technique】 [0002] As a device for cooling superconducting magnets, a cryogenic freezer that generates ultra-low temperatures at the 4K level is used. In such a cryogenic freezer, it is of course an important issue to efficiently generate cold at a cryogenic level, and it is also an important issue to prevent intrusion of heat from the outside. Therefore, conventionally, in order to prevent the intrusion of heat into the cryogenic zone, a so-called heat shielding technique of covering a part or the whole of the cryogenic zone with a low-temperature plate-shaped object or a cylindrical object has been used. [0003] For example, in Japanese Patent Application Laid-Open No. 9-229503, an ultra-low temperature freezer using heat shield technology is introduced. This ultra-low temperature freezer is equipped with a JT refrigerator that generates l...

Claims

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Application Information

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IPC IPC(8): F25B9/00F25B1/10F25B9/02F25B9/10F25B9/14F25B25/00F25D3/10
CPCF25B9/14F25B25/005F25B9/02F25B9/10F25D3/10F25B2600/021F25B1/10
Inventor 草田荣久本吉智行真田芳直富冈计次
Owner CENTRAL JAPAN RAILWAY COMPANY
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