Vacuum insulated structure with end fitting and method of making same
A vacuum insulated structure including a tube having an outer wall, a jacket surrounding the tube to enclose an annular insulating space, the jacket having an end that terminates at the outer wall of the tube, a seal formed between the end of the jacket and the tube to preserve a vacuum within the insulating space, and a fitting affixed to one of the tube and the jacket for coupling the vacuum insulated structure to an external device. A method of making a vacuum insulated structure including forming a tube and a jacket, positioning the jacket over the tube to form an annular insulating space, with an end of the jacket being positioned adjacent to an outer wall of the tube to form a vent, causing air to escape through the vent, sealing the vent, and affixing a fitting to one of the tube and the jacket.
1. A vacuum insulated structure comprising:
a vessel having an outer surface, and inner surface, and a lumen defined by the inner surface;
a jacket surrounding at least part of the vessel to enclose an annular insulating space between the vessel and the jacket,
the jacket having a first converging region that converges toward the vessel, the first converging region having an end that terminates adjacent to the outer surface of the vessel,
a first seal brazed between the end of the first converging region and the outer surface of the vessel so as to preserve a vacuum within the insulating space; and
a first fitting disposed between the vessel and the jacket for coupling the vacuum insulated structure to an external device,
the first fitting forming a seal with the jacket and the vessel.
2. The vacuum insulated structure of claim 1 , wherein the jacket has a second converging region that converges toward the vessel.
3. The vacuum insulated structure of claim 1 , wherein the first fitting comprises a threaded region.
4. The vacuum insulated structure of claim 1 , wherein the first fitting comprises one or more webs configured to support a nut.
5. The vacuum insulated structure of claim 4 , wherein the nut is substantially in the center of the interior of the vessel.
6. The vacuum insulated structure of claim 1 , wherein the first fitting comprises a rod.
7. The vacuum insulated structure of claim 6 , wherein the rod comprises a threaded region.
8. The vacuum insulated structure of claim 1 , wherein the fitting comprises a bore therethrough.
9. The vacuum insulated structure of claim 1 , wherein the vessel is characterized as having a single inlet.
10. The vacuum insulated structure of claim 9 , wherein the first fitting is affixed to the outer surface of the vessel.
11. The vacuum insulated structure of claim 1 , wherein the vessel is characterized as a tube.
12. The vacuum insulated structure of claim 11 , wherein the vessel is characterized as a closed-ended tube.
13. The vacuum insulated structure of claim 1 , wherein the first fitting is affixed at an end of the jacket.
14. The vacuum insulated structure of claim 1 , wherein the first fitting is affixed at an intermediate position along the jacket.
15. The vacuum insulated structure of claim 1 , wherein the fitting comprises an L-shape.
16. The vacuum insulated structure of claim 1 , further comprising a second fitting affixed to at least one of the vessel and the jacket.
17. The vacuum insulated structure of claim 16 , wherein the jacket is affixed to the first and second fittings.