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US 12,540,759 B2Granted
Two opening Dewar with desiccant annulus
AssigneeThe Government of the United States of America, as represented by the Secretary of the Navy
InventorsChristofer Joseph Fackrell, Anthony Gerard Pollman, Douglas Lee Van Bossuyt
Life of this patent
Estimating the term…
Abstract
A dewar includes two coaxial openings of different sizes (e.g., to allow for interfacing with a Stirling cryocooler and a Stirling generator), a polytetrafluoroethylene or glass inner chamber (e.g., to reduce conductive heat transfer, particularly through the dewar neck), and an integrated, annular desiccant ring (e.g., for drying low-pressure, ambient air).
Claims19
A system using a dewar, the system comprising:
- a cryocooler to cool a tip of a cold head to cryogenic temperatures, the cryocooler further comprising:
- a heat sink to reject heat from the cryocooler,
- a cold head that protrudes into the dewar through an upper cryocooler cavity, the cold head to condense ambient air to create liquified air in the dewar;
- the dewar to hold the liquified air at low temperatures, the dewar having the cryocooler cavity and a Stirling cavity that are coaxial, wherein the dewar further comprises:
- a polytetrafluoroethylene or glass inner shell that reduces conductive heat transfer through a neck of the dewar, and
- an integrated, annular ring fitted in the cryocooler cavity and filled with desiccant, the integrated, annular ring for drying low-pressure, ambient air;
- and
- a Stirling engine to drive an electronic generator, the Stirling engine further comprising:
- a cold finger protruding into the dewar through the lower Stirling cavity, the cold finger to move the liquified air from the dewar to a Stirling heat sink,
- the Stirling heat sink to expand the liquified air and to drive the electronic generator, and the electronic generator to generate output electricity.
7 more elements
A dewar comprising:
- a top opening;
- a bottom opening;
- an inner shell that reduces conductive heat transfer, wherein the inner shell comprises polytetrafluoroethylene or glass;
- an outer shell;
- a gap between the inner shell and the outer shell;
- a desiccant ring;
- an upper cryocooler cavity;
- and
- a Stirling cavity;
- the upper cryocooler cavity and the Sterling cavity are coaxial.
7 more elements
A system comprising:
- a dewar comprising:
- a top opening;
- a bottom opening;
- an inner shell that reduces conductive heat transfer, wherein the inner shell comprises polytetrafluoroethylene or glass;
- an outer shell;
- a gap between the inner shell and the outer shell;
- a desiccant ring;
- an upper cryocooler cavity;
- and
- a Stirling cavity;
- the upper cryocooler cavity and Stirling cavity are coaxial;
- a cryocooler associated with the top opening;
- and
- an electronic generator associated with the bottom opening.
11 more elements
Dependencies are inferred from the claim text.