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Dewar cooling device

  • US 3,984,222 A
  • Filed: 12/23/1974
  • Issued: 10/05/1976
  • Est. Priority Date: 12/23/1974
  • Status: Expired due to Term
First Claim
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1. A cryogenic storage vessel of the Dewar type in which an inner storage container thereof is adapted to be pumped to remove fluid therefrom to reduce the pressure in said inner storage container as pumped fluid is removed, said storage vessel comprising:

  • refrigeration capturing means for capturing refrigeration from the pumped fluid including a highly thermally conductive porous member located in the path of the fluid being pumped therefrom so that the refrigeration from said fluid is transferred to said highly thermally, conductive porous member;

    said refrigeration capturing means being in contact with the wall of said inner storage container so that refrigeration is transferred thereto and available to intercept heat entering said inner storage container along said wall;

    said highly thermally conductive porous member having pores sized so that a given pumping speed can be maintained, but having a surface area sized so that a given amount of refrigeration from the pumped fluid can be transferred thereto; and

    wherein said refrigeration capturing means includes a highly thermally conductive compressible member between said inner wall and said highly thermally conductive porous member for substantially sealing the volume between said wall and said porous member to prevent the flow of fluid between said porous member and said wall.

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