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EP0554966A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Cryogenic device

Assignee: Fujitsu Ltd
•
Filing: 1989-11-20
•
Granted: —
•
Expires: 2009-11-20
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Abstract

Abstract A closed cycle system cryogenic device which enables a heat exchanger pipe of relatively narrow diameter to be present within a cryostat contains, as a cooling medium, one or more liquid fluorocarbons of the formula: Cm F2m+2, wherein m is an integer of 1 to 4, an article to be cooled being immersed in the cooling medium, and a heat exchanger pipe which is disposed in an upper portion of the cryostat and is communicated with a separate liquifier, so that the cooling medium boiled and vaporised as a result of a heat generation in the cryostat is liquified within the same cryostat as a result of a heat exchange between vapour of the cooling medium and a liquid gas circulated as a heat exchange medium in the heat exchanger pipe.

Inventors

  • 👤 Kishio Yokouchi
  • 👤 Mitsutaka Yamada
  • 👤 Nobuo Kamehara
  • 👤 Koichi Niwa

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 08:31
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; H; H10; H10W; H10W40/00; H10W40/30; H10W40/305; C09K2205/00; C09K2205/10; C09K2205/12; C09K2205/128; F; F25; F25D; F25D3/00; F25D3/10

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 125 words
A cryogenic device having a closed cycle system, which comprises a closed cryostat containing, as a cooling medium, one or more liquid fluorocarbons of the formula: C m F 2m+2 , wherein m is an integer of 1 to 4, an article to be cooled being immersed in the cooling medium, and a heat exchanger pipe which is disposed in an upper portion of the cryostat and is communicated with a separate liquifier so that the cooling medium boiled and vaporised as a result of a heat generation in the cryostat is liquified within the same cryostat as a result of a heat exchange between vapour of the cooling medium and a liquid gas circulated as a heat exchange medium in the heat exchanger pipe.
Claim 2
Dependent Claim 17 words
A device according to claim 1, in which liquid nitrogen is used as the heat exchange medium.
Claim 3
Dependent Claim 20 words
A device according to claim 1 or 2, in which the liquefier comprises a Stirling cycle refrigerator with a compressor.
Claim 4
Dependent Claim 15 words
A cryogenic device as claimed in any preceding claim, wherein the fluorocarbon is liquid CF₄.

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