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
CN1459606AInactive Publication Date: 2003-12-03CENTRAL JAPAN RAILWAY COMPANY +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CENTRAL JAPAN RAILWAY COMPANY
Publication Date
2003-12-03
Estimated Expiration
Not applicable · inactive patent

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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.
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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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