CRYOGENIC DEWAR
This patent relates to a dewar for storing cryogenic gase and is of the type having aii inner flask surrounded by a vacuum jacket and having a vent spout through which evaporating gas escapes. Heretofore substantial gas loss has resulted from the radiation of heat towards the flask from the warmer outer elements of the dewar. In this invention, the mask is surrounded by a thermally conducting shield which is disposed in the vacuum space between the flask and the outer elements of the dewar. The shield contacts only the vent spout, which is cooled by the evaporating gas, and thus is maintained at a temperature very close to that of the flask itself. Accordingly, heat radiated toward the flask is intercepted and conducted to the evaporating gas rather than being re-radiated towards the hask. In a liquid helium dewar of typical configniration the mention reduces the boil-off rate by approximately one-half.(AEC)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-18-005457
- Assignee:
- U.S. Atomic Energy Commission
- Patent Number(s):
- US 3119238
- OSTI ID:
- 4156738
- Country of Publication:
- United States
- Language:
- English
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