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US 4,364,235 AGranted
Helium-cooled cold surface, especially for a cryopump
AssigneeKernforschungsanlage Julich Gesellschaft mit beschrankter Haftung
InventorJohann Hemmerich
Life of this patent
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Abstract
A cold surface, (e.g. for use in a so-called cryopump, i.e. a cryogenic vacuum vapor pump), is formed by a reservoir for liquid hydrogen surrounded by a double-wall vessel over an intervening evacuated insulating space. The lowest points of the compartment formed between the walls of the double-wall vessel and the interior of the liquid helium reservoir are connected by a conduit provided with a valve.
Claims8
A deep-cooled assembly especially adapted to form a cryosurface for a cryopump, comprising:
- a liquid helium reservoir;
- a double-wall outer vessel spacedly surrounding said reservoir and formed with at least one deep-cooled surface and at least one compartment formed between walls of said vessel;
- a duct connecting the bottom of said compartment with the bottom of the interior of said receptacle and provided with a duct whereby said deep-cooled surface is cooled by transfer of liquid helium from said reservoir into said compartment through said duct and said surface is warmed upon transfer of liquid helium from said compartment through said duct into said reservoir;
- and
- means for thermally insulating the space between said reservoir and said vessel.
2 more elements
Dependencies are inferred from the claim text.