Dewar cooling device
First Claim
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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Accused Products
Abstract
A dewar vessel adapted to have fluid pumped therefrom to reduce its internal pressure and temperature has a porous plate located in the path of the pumped fluid. For a given fluid pressure and viscosity, the pores are sized to provide a sufficiently low pressure drop across the plate while still providing a sufficiently large surface area for the transfer of heat between the vessel and the pumped fluid. A sheet-like liquid-retaining collar extends from the interior wall of the dewar container toward the center thereof so that the container liquid is restrained from moving along the container'"'"'s inner wall when the container is tilted.
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Citations
16 Claims
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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:
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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. - View Dependent Claims (2)
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3. 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:
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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; probe means extending through said refrigeration capturing means into said inner storage container; said refrigeration capturing means being in contact with said probe means so that said refrigeration is available to intercept heat entering said inner container along said probe means; and a sheet-like fluid retaining means located in the lower portion of said inner storage container and extending from the inner walls thereof toward said probe for preventing a portion of the cryogen in said vessel from moving past said retaining means when said vessel is tilted. - View Dependent Claims (4)
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5. 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:
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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 a reentry neck between said wall of said inner storage container and the outer wall of said vessel.
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6. A cryogenic storage vessel of the Dewar type in which an inner storage container thereof is adapted to be pumped to remove gas therefrom through a neck portion thereof to reduce the pressure in said inner storage container as pumped gas is removed through said neck portion, said storage vessel comprising:
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refrigeration capturing means for capturing refrigeration from the pumped gas including a highly-thermally-conductive sintered porous plate located in the path of the gas being pumped therefrom so that the refrigeration from said gas is transferred to said sintered porous plate; said refrigeration capturing means being in contact with the wall of said neck portion of said inner storage container and extending over the area of said neck portion available for gas flow so that refrigeration is transferred thereto and available to intercept heat entering said inner container along said wall; said highly-thermally-conductive sintered porous plate 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 can be transferred thereto from the pumped gas. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification