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Title: CRYOGENIC DEWAR

Abstract

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)

Inventors:
;
Issue Date:
Research Org.:
Originating Research Org. not identified
OSTI Identifier:
4156738
Patent Number(s):
3119238
Assignee:
U.S. Atomic Energy Commission
Patent Classifications (CPCs):
F - MECHANICAL ENGINEERING F17 - STORING OR DISTRIBUTING GASES OR LIQUIDS F17C - VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10S - TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
NSA Number:
NSA-18-005457
Resource Type:
Patent
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-64
Country of Publication:
United States
Language:
English
Subject:
ENGINEERING; BOILING; COOLING; CRYOGENICS; EFFICIENCY; EVAPORATION; GASES; HELIUM; LIQUIDS; PATENT; THERMAL CONDUCTIVITY; THERMAL INSULATION; THERMAL RADIATION; VACUUM

Citation Formats

Chamberlain, W H, and Maseck, H E. CRYOGENIC DEWAR. United States: N. p., 1964. Web.
Chamberlain, W H, & Maseck, H E. CRYOGENIC DEWAR. United States.
Chamberlain, W H, and Maseck, H E. Tue . "CRYOGENIC DEWAR". United States.
@article{osti_4156738,
title = {CRYOGENIC DEWAR},
author = {Chamberlain, W H and Maseck, H E},
abstractNote = {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)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1964},
month = {1}
}

Patent:
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