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 Flexible cryogenic envelope

Details
Inventors: Leonard, Kenneth R.; Loudon, John D.;
Assignee: Cryogenic Technology, Inc. (Denver, CO)
Primary Examiner: O'Dea; William F.
Assistant Examiner: Capossela; Ronald C.
Attorney, Agent or Firm: Griffin, Branigan & Butler

A superconducting power transmission line is comprised of sections of rigid cryogenic envelope and sections of flexible cryogenic envelope. The rigid sections are comprised of rigid inner and outer tubes having a refrigeration shield located in a vacuum chamber therebetween. The flexible sections are comprised of flexible inner and outer tubes surrounded by reinforcing braid. The rigid and flexible inner and outer tubes are joined together and a refrigeration tube which is in contact with the rigid section's shield is coiled about the inner flexible tube.

DETAILED DESCRIPTION The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1.
A flexible cryogenic envelope including: a rigid portion comprising: a rigid inner tube and a rigid outer tube generally coaxial with said rigid inner tube; [A] a means for holding said inner and outer tubes in positions spaced from one another; a flexible portion comprising: a flexible inner tube; a layer of reinforcing braid surrounding said inner flexible tube; an outer flexible tube generally coaxial with said inner tube; a layer of braid covering said outer flexible tube for protecting said outer flexible tube, at least a portion of the volume between the inner layer of braid and said outer flexible tube providing a vacuum chamber in said flexible envelope for holding a vacuum; and refrigeration means for directing refrigeration through said vacuum chamber in said flexible envelope; and means for connecting said rigid portion to one end of said flexible portion.
2.
The envelope of claim 1 wherein said refrigeration means includes a tube having at least a portion thereof coiled about said inner flexible tube so that the refrigeration tube is adapted to flex with said inner flexible tube.
3.
The flexible cryogenic envelope of claim 1 including a second rigid portion connected to the outer end of said flexible portion.
4.
The flexible cryogenic envelope of claim 3 wherein said refrigeration means includes a tube having at least a portion thereof coiled about said inner flexible tube so that the refrigeration tube is adapted to flex with said inner flexible tube.
5.
The flexible cryogenic envelope of claim 1 wherein said means for holding said inner and outer tubes in positions includes a thermal-standoff means in said rigid section, said refrigeration means extending from said flexible portion into said rigid portion and being supported therein by said thermal-standoff means.
6.
The flexible cryogenic envelope of claim 5 wherein said refrigeration means includes a tube having at least a portion thereof coiled about said inner flexible tube so that the refrigeration tube is adapted to flex with said inner flexible tube


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